Small Intestinal Bacterial Overgrowth (SIBO), a clinically overdiagnosed entity? / Sobrecrecimiento bacteriano del intestino delgado (SIBO), ¿una entidad clínica sobrediagnosticada?

Small intestinal bacterial overgrowth (SIBO) is a clinical entity recognized since ancient times; it represents the consequences of bacterial overgrowth in the small intestine associated with malabsorption. Recently, SIBO as a term has been popularized due to its high prevalence reported in various pathologies since the moment it is indirectly diagnosed with exhaled air tests. In the present article, the results of duodenal/jejunal aspirate culture testing as a reference diagnostic method, as well as the characteristics of the small intestinal microbiota described by culture-dependent and culture-independent techniques in SIBO, and their comparison with exhaled air testing are presented to argue about its overdiagnosis.

Trimethylamine N-oxide and kidney diseases: what do we know? / N-óxido de trimetilamina e doenças renais: o que sabemos?

Abstract In the human gut, there is a metabolically active microbiome whose metabolic products reach various organs and are used in the physiological activities of the body. When dysbiosis of intestinal microbial homeostasis occurs, pathogenic metabolites may increase and one of them is trimethyl amine-N-oxide (TMAO). TMAO is thought to have a role in the pathogenesis of insulin resistance, diabetes, hyperlipidemia, atherosclerotic heart diseases, and cerebrovascular events. TMAO level is also associated with renal inflammation, fibrosis, acute kidney injury, diabetic kidney disease, and chronic kidney disease. In this review, the effect of TMAO on various kidney diseases is discussed.

Resumo No intestino humano, existe um microbioma metabolicamente ativo cujos produtos metabólicos alcançam diversos órgãos e são utilizados nas atividades fisiológicas do corpo. Quando ocorre disbiose da homeostase microbiana intestinal, os metabólitos patogênicos podem aumentar, e um deles é o N-óxido de trimetilamina (TMAO). Acredita-se que o TMAO tenha um papel na patogênese da resistência à insulina, diabetes, hiperlipidemia, doenças cardíacas ateroscleróticas e eventos cerebrovasculares. O nível de TMAO também está associado à inflamação renal, fibrose, lesão renal aguda, doença renal diabética e doença renal crônica. Nesta revisão, discute-se o efeito do TMAO em diversas doenças renais.

Comparação da microbiota intestinal em modelos animais de doença hepática esteatótica alcoólica e metabólica / Comparison of gut microbiota in alcoholic and metabolic-dysfuncion associated steatotic liver disease in animal models

ABSTRACT Background: Alcoholic liver disease (ALD) and metabolic-dysfunction associated steatotic liver disease (MASLD) are common, and gut microbiota (GM) is involved with both. Here we compared GM composition in animal models of MASLD and ALD to assess whether there are specific patterns for each disease. Methods: MASLD model- adult male Sprague Dawley rats, randomized into two groups: MASLD-control (n=10) fed a standard diet; MASLD-group (n=10) fed a high-fat-choline-deficient diet for 16 weeks. ALD model- adult male Wistar rats randomized: ALD-control (n=8) fed a standard diet and water+0.05% saccharin, ALD groups fed with sunflower seed and 10% ethanol+0.05% saccharin for 4 or 8 weeks (ALC4, n=8; ALC8, n=8). ALC4/8 on the last day received alcoholic binge (5g/kg of ethanol). Afterwards, animals were euthanized, and feces were collected for GM analysis. Results: Both experimental models induced typical histopathological features of the diseases. Alpha diversity was lower in MASLD compared with ALD (p<0.001), and structural pattern was different between them (P<0.001). Bacteroidetes (55.7%), Firmicutes (40.6%), and Proteobacteria (1.4%) were the most prevalent phyla in all samples, although differentially abundant among groups. ALC8 had a greater abundance of the phyla Cyanobacteria (5.3%) and Verrucomicrobiota (3.2%) in relation to the others. Differential abundance analysis identified Lactobacillaceae_unclassified, Lachnospiraceae_NK4A136_group, and Turicibacter associated with ALC4 and the Clostridia_UCG_014_ge and Gastranaerophilales_ge genera to ALC8. Conclusion: In this study, we demonstrated that the structural pattern of the GM differs significantly between MASLD and ALD models. Studies are needed to characterize the microbiota and metabolome in both clinical conditions to find new therapeutic strategies.

RESUMO Contexto: A doença hepática alcoólica (DHA) e a doença hepática esteatótica associada à disfunção metabólica (MASLD) são comuns, e a microbiota intestinal (MI) está envolvida em ambas. Aqui, comparamos a composição da MI em modelos animais de MASLD e DHA para avaliar se existem padrões específicos para cada doença. Métodos: Modelo de MASLD - ratos machos adultos da linhagem Sprague Dawley, randomizados em dois grupos: MASLD-controle (n=10) alimentados com uma dieta padrão; grupo MASLD (n=10) alimentados com uma dieta rica em gordura e deficiente em colina por 16 semanas. Modelo de DHA - ratos machos adultos da linhagem Wistar randomizados: DHA-controle (n=8) alimentados com uma dieta padrão e água+0,05% de sacarina; grupos DHA alimentados com semente de girassol e 10% de etanol+0,05% de sacarina por 4 ou 8 semanas (DHA4, n=8; DHA8, n=8). DHA 4/8 no último dia receberam binge alcoólico (5 g/kg de etanol). Posteriormente, os animais foram sacrificados, e as fezes foram coletadas para análise da MI. Resultados: Ambos os modelos experimentais induziram características histopatológicas típicas das doenças. A diversidade alfa foi menor na MASLD em comparação com a DHA (P<0,001), e o padrão estrutural foi diferente entre elas (P<0,001). Bacteroidetes (55,7%), Firmicutes (40,6%) e Proteobactérias (1,4%) foram os filos mais prevalentes em todas as amostras, embora com abundâncias diferenciadas entre os grupos. DHA8 teve uma maior abundância dos filos Cyanobacteria (5,3%) e Verrucomicrobiota (3,2%) em relação aos outros. A análise de abundância diferencial identificou Lactobacillaceae_unclassified, Lachnospiraceae_NK4A136 e Turicibacter associados ao grupo DHA4, e os gêneros Clostridia_UCG_014_ge e Gastranaerophilales_ge associados ao DHA8. Conclusão: Neste estudo, demonstramos que o padrão estrutural da MI difere significativamente entre os modelos de MASLD e DHA. Estudos são necessários para caracterizar a microbiota e os metabólitos ativos em ambas as condições clínicas, a fim de encontrar novas estratégias terapêuticas.

Fatores dietéticos e microbianos que interferem no tratamento da osteoartrite / Dietary and microbial factors that interfere in the treatment of osteoarthritis / Factoresdietéticos y microbianos que interfieren en el tratamento de la artroses

Introdução:A osteoartrite é uma doença degenerativa caracterizada pela deterioração progressiva da cartilagem articular, resultando em dor e incapacidade articular total em estágios avançados.Éconsiderada um dos distúrbios articulares mais comuns em todo o mundo e sua prevalência está aumentando constantemente devido ao envelhecimento, dietas inflamatórias e inatividade física. Objetivo:Investigar a contribuição da microbiota intestinal e dos componentes dietéticos, naperspectiva dediminuir as patologias associadas à osteoartrite. Metodologia:Trata-se de uma revisão integrativa desenvolvida a partir da seleção de artigos disponíveis escritos nalíngua inglesa, publicados nas bases de dados Pubmed e Science Direct. Resultados:No total, 25.583 artigos foram encontrados na busca, após os critérios de exclusão, 19 artigos compuseram o corpo de análise da revisão. Pesquisas em animais mostram que os efeitos induzidos por dieta rica em gordura foram evidentes e indicaram uma inflamação sistêmica de baixo grau resultando no agravamento da oesteoartritepor meio do aumento da degeneração da cartilagem. Dado ao impacto potencial da dieta na oesteoartrite, foram realizados estudos para avaliar a dieta mediterrânea, os níveis de ômega 3 e 6, vitamina C e E, com destaque para a oligofrutose, uma abordagem nova para tratar a oesteoartriteda obesidade. Conclusões:Conclui-se que apesar de já existir alguma evidência da utilidade da nutrição por meioda dieta alimentar como complemento da terapêutica na osteoartrite são necessários mais estudos que comprovem as intervenções na redução máxima dos marcadores inflamatórios ocasionando o alíviodos sintomas em pacientes com oesteoartrite (AU).

Introduction:Osteoarthritis is a degenerative disease characterized by progressive deterioration of the articular cartilage, resulting in pain and total joint disability in advanced stages. It is considered one of the most common joint disorders worldwide and its prevalence is steadily increasing due to aging, inflammatory diets and physical inactivity. Objective:The aim of this literature review was to investigate the contribution of intestinal microbiota and dietary components to try to reduce the pathologies associated with osteoarthritis.Methodology:This is an integrative review, developed from the selectionof available articles written in English, published in the Pubmed and Science Direct databases. Results:Intotal, 25.583articleswerefoundinthesearch,aftertheexclusioncriteria,19 articles madeupthebodyofanalysisofthereview.Animal research shows that the effects induced by a high-fat diet were evident and indicated low-grade systemic inflammation resulting in worsening osteoarthritis by increasing cartilage degeneration. Given the potential impact of diet on osteoarthritis, studies have been conducted to evaluate the Mediterranean diet, omega 3 and 6 levels, vitamin C and E, especially oligofructose, a new approach to treat obesity osteoarthritis.Conclusions:It is concluded that although there is already some evidence of the usefulness of nutrition through the diet as a complement to therapy in osteoarthritis, further studiesare needed to prove the interventions in the maximum reduction of inflammatory markers will cause the relief of symptoms in patients with osteoarthritis (AU).

Introducción: La artrosis es una enfermedad degenerativa caracterizada por el deterioro progresivo del cartílago articular, que se traduce en dolor e incapacidad articular total en estadios avanzados. Se considera uno de los trastornos articulares más comunes en todo el mundo y su prevalencia aumenta constantemente debido al envejecimiento, las dietas inflamatorias y la inactividad física. Objetivo: El objetivo de esta revisión fue investigar la contribución de la microbiota intestinal y los componentes de la dieta, en un intento por reducirlas patologías asociadas a la artrosis. Metodología: Se trata de una revisión integradora, desarrollada a partir de la selección de artículos disponibles escritos en inglés, publicados en las bases de datos Pubmed y Science Direct. Resultados: En total, se encontraron 25.583 artículos en la búsqueda, después de los criterios de exclusión, 19 artículos conformaron el cuerpo de análisis de la revisión.La investigación en animales muestra que los efectos inducidos por una dieta alta en grasas fueron evidentes e indicaron una inflamación sistémica de bajo grado que resultó en un empeoramiento de la osteoartritis a través de una mayor degeneración del cartílago. Dado el impacto potencial de la dieta en la osteoartritis, se han realizado estudios para evaluar ladieta mediterránea, los niveles de omega 3 y 6, vitamina C y E, con énfasis en la oligofructosa, un nuevo enfoque para tratar la osteoartritis por obesidade.Conclusiones: Se concluye que aunque ya existe alguna evidencia de la utilidad de la nutrición a través de la dieta como complemento al tratamiento de la artrosis, son necesarios más estudios que prueben intervenciones en la reducción máxima de los marcadores inflamatorios, provocando el alivio de los síntomas en pacientes con osteoartritis (AU).

Un reto biomédico: facilitar la disponibilidad informativa acerca de la relación entre la microbiota intestinal, medicamentos y vacunas / A biomedical challenge: to facilitate the availability of information about the relationship between gut microbiota, drugs and vaccines / Um desafio biomédico: facilitar a disponibilidade de informações sobre a relação entre a microbiota intestinal, medicamentos e vacinas

Resumen El personal biomédico carece de plataformas informatizadas que resuman los principales mecanismos de colaboración entre los microbios intestinales y los seres humanos en cuanto a la absorción y transformación de los medicamentos o vacunas y sus respuestas homeostáticas. Por esta razón, el presente trabajo tiene como objetivo aportar evidencias y recomendaciones para el diseño de una plataforma de consulta biomédica, referente a esta relación, lo cual permitirá la valoración de la posible inclusión de la taxa y abundancia microbiana intestinal en los protocolos de evaluación de la efectividad de los mismos. La encuesta realizada a un grupo de profesionales, destinada a la verificación de las posibilidades de acceso y especificidad de este tipo de información posibilitó la identificación de los tópicos principales para la conexión entre grupos de medicamentos, estructura tridimensional, moduladores y mediadores de la respuesta homeostática, biomarcadores, relación inter-reinos y mecanismos patogénicos, de manera que se fusione toda la información "ómica" humanomicrobiota en una plataforma dentro de la página del NCBI, la cual se propone que se denomine Pharmacolobiomic o Pharmaco-metagenomic. La información existe en las bases de datos contenidas en NCBI-NIH, según la búsqueda realizada y el filtrado a partir de 28 628 referencias. A partir de la presente propuesta se demostró la necesidad de contar con una plataformafarma cometagenómica que resuma el papel de la microbiota intestinal en el metabolismo y la efectividad de los fármacos y vacunas; así como disponer de la actualización sistemática para los profesionales en cuanto a la microbiota como biomarcador, en los protocolos de ensayos clínicos.

Abstract Biomedical staff lacks a computer platform that summarises the main mechanisms of collaboration between intestinal microbes and humans, related to the absorption and transformation of drugs and vaccines and their ho-meostatic responses. For this reason, the aim of this work is to provide some evidences and recommendations for the design of a biomedical consultation platform, about the relationship between the microbiota and the effect of drugs or vaccines. These evidences will support the assessment for inclu¬sion of taxa and gut microbial abundance, as a part of clinical protocols of effectiveness. The survey carried out on a group of biomedical professionals, aimed at verifying the possibilities of access and specificity of this type of information made it possible to identify the main topics for the connection between drug groups, three-dimensional structure, modulators and mediators of the homeostatic response, biomarkers, inter-kingdom relationship and pathogenic mechanismsin such a way that all the human-microbiota "omics" information will be shown into a sub-platform within NCBI-NIH, which could be called Pharmacolobiomic or Pharmaco-metagenomic. The information is present in the databases contained in the NCBI, taking into account this search and filtering, from 28 628 references. Based on this proposal, the need for a pharmacometagenomic platform that summarises the role of the intestinal microbiota in the metabolism and effectiveness of drugs and vaccines was demonstrated, as well as having the systematic update for professionals about the microbiota as a biomarker, in clinical trial protocols.

Resumo O pessoal biomédico carece de plataformas computadorizadas que resumam os principais mecanismosde colaboração entre micróbios intestinais e seres humanos, em termos de absorção e transformação demedicamentos e vacinas e suas respostas homeostáticas. Por essa razão, este trabalho visa fornecer evidênciase recomendações para o desenho de uma plataforma de consulta biomédica, referente a esta relação;o que permitirá avaliar a possível inclusão dos táxons e da abundância microbiana intestinal nosprotocolos de avaliação da sua eficácia. A pesquisa realizada em um grupo de profissionais, teve comoobjetivo verificar as possibilidades de acesso e especificidade desse tipo de informação; possibilitouidentificar os principais tópicos para a conexão entre grupos de medicamentos, estrutura tridimensional,moduladores e mediadores da resposta homeostática, biomarcadores, relação inter-reino, mecanismospatogênicos; de forma tal que toda a informação "ômica" humano-microbiota se funde em uma plataformadentro da página do NCBI, à qual se propõe ser chamada de Pharmacolobiomic ou Pharmacometagenomic. A informação existe nas bases de dados contidas em NCBI-NIH, tendo em conta a pesquisarealizada e a filtragem, a partir de 28 628 referências. Com base nessa proposta, foi demonstradaa necessidade de contar com uma plataforma farmacometagenômica que resuma o papel da microbiotaintestinal no metabolismo e eficácia de medicamentos e vacinas; além de ter a atualização sistemáticapara os profissionais quanto à microbiota como biomarcador, nos protocolos de ensaios clínicos.

Effect of an Alliaceae Encapsulated Extract on Growth Performance, Gut Health, and Intestinal Microbiota in Broiler Chickens Challenged with Eimeria spp.

This study analyzed the effects of an Alliaceae encapsulated extract (AE-e) on daily gain (ADG), feed intake (ADFI), feed conversion ratio (FCR), oocysts per gram of feces (OPG), intestinal lesion (LS), and microbiota composition in broilers challenged with Eimeria spp. A total of 4800 one day Cobb-500 were allotted into 10 treatment groups with 12 replicates of 40 birds in a 2 × 4 + 2 factorial arrangement. The first factor was non-challenged (NC) or challenged (C), the second was four levels of AE-e added in the basal diet, 0 (AE0), 250 (AE250), 500 (AE500), and 750 mg·kg-1 (AE750), plus two ionophore controls, non-challenged (NC-Ion) and challenged (C-Ion). No interactions were observed between factors (NC0, NC250, NC500, NC750, C0, C250, C500, and C750), while C-Ion improved FCR at 21 d. The challenge affected negatively ADG and FCR and promoted enteropathogens in cecum. AE750 improved FCR in the finisher and cumulative phases, while C-Ion had fewer total OPG than C0 and C250. Likewise, at 21d, C250, C500, and C-Ion had fewer LS than C0, while at 28 d, C750 showed lower than C-Ion. In the cecum microbiota, C500 had more Ruminococcus, Firmicutes b, and Intestinimonas than C-Ion. In summary, AE-e showed beneficial results in broilers infected with Eimeria spp.

[Early life nutrition and immunity]. / Nutrición e inmunidad en las primeras etapas de la vida.

Introduction: The first 1,000 days of life, from conception to two years of age, are a critical time window for human growth and development, since the interaction of different factors can generate relevant changes in different structures and functions of the organism, both at short and long term. Most of the studies in this area have been carried out in the prenatal and neonatal period. Some of the most relevant factors that can affect immune development at this time are smoking, maternal obesity and inadequate intake of micronutrients during pregnancy. In the case of the postnatal period, breastfeeding is primarily the most important factor related to the nutritional and immunological status of the newborn, also being associated with a protective effect against obesity. Subsequently, the proper introduction of complementary feeding will be essential to offer an adequate percentage of nutrients. Likewise, the intestinal microbiota also plays a key role during this period since it is part of different metabolic, protective, and immunological functions of the host. Fluctuations in homeostasis will condition the appearance of dysbiosis, which is associated with the development of different diseases in childhood, adolescence, and adulthood.

Introducción: Los primeros 1.000 días de vida, que van desde la concepción hasta los dos años, son una ventana de tiempo crítica para el crecimiento y desarrollo humano, ya que la interacción de diversos factores puede generar cambios relevantes en diferentes estructuras y funciones del organismo tanto a corto como a largo plazo. La mayoría de los estudios en este ámbito se han realizado en el periodo prenatal y neonatal. Algunos de los factores más relevantes que pueden afectar el desarrollo inmunitario en esta etapa son el tabaquismo, la obesidad materna y la ingesta inadecuada de micronutrientes durante el embarazo. En el caso de la etapa posnatal, la lactancia materna es en primera instancia el factor más importante relacionado con el estado nutricional e inmunológico del recién nacido, asociándose también con un efecto protector frente a la obesidad. Posteriormente, la introducción apropiada de la alimentación complementaria será fundamental para ofrecer un porcentaje adecuado de nutrientes. Por su parte, la microbiota intestinal también juega un papel clave durante este periodo, ya que interviene en diferentes funciones metabólicas, protectoras e inmunológicas del hospedador. Fluctuaciones en su homeostasis van a condicionar la aparición de disbiosis, la cual se asocia con el desarrollo de diferentes enfermedades, tanto en la niñez como en la adolescencia y también en la edad adulta.

[Anorexia nervosa, microbiota and brain]. / Anorexia nerviosa, microbiota y cerebro.

Introduction: Anorexia nervosa (AN) is a psychiatric disease with a high prevalence and comorbidities, characterized by a low response rate to treatment. It is considered as a multifactorial disease. In recent years, the focus has been placed on the presence of intestinal dysbiosis and its possible involvement as a causal factor as well as an alternative treatment. The objective of this work has been to review the current state of knowledge of alterations in the intestinal microbiota identified in patients with AN and the possibility of using probiotics as a therapeutic alternative. Significant changes in the diversity of species associated with weight loss have been described that could favor the perpetuation of the disorder, and that would explain many of the nutritional, gastrointestinal, psychological, and cognitive alterations present in these patients. The use of probiotics, still little studied in patients with AN, sheds some light on this matter to improve the treatment response, always hand in hand with conventional treatments.

Introducción: La anorexia nerviosa (AN) es una enfermedad psiquiátrica, con elevada prevalencia y comorbilidades, caracterizada por una baja tasa de respuesta al tratamiento. Se considera una enfermedad multifactorial. En los últimos años se ha puesto el foco en la presencia de disbiosis intestinal y su posible implicación como factor causal, así como alternativa de tratamiento. El objetivo de este trabajo ha sido revisar el estado actual del conocimiento de las alteraciones en la microbiota intestinal identificadas en pacientes con AN y la posibilidad del uso de probióticos como alternativa terapéutica. Se han descrito importantes cambios en la diversidad de las especies asociadas a la pérdida de peso que podrían contribuir a perpetuar el trastorno y que explicarían muchas de las alteraciones nutricionales, gastrointestinales, psicológicas y cognitivas presentes en estos pacientes. El uso de probióticos, poco estudiado aún en pacientes con AN, abre una nueva ventana para mejorar la respuesta, siempre de la mano de los tratamientos convencionales.

Mannan oligosaccharides selenium ameliorates intestinal mucosal barrier, and regulate intestinal microbiota to prevent Enterotoxigenic Escherichia coli -induced diarrhea in weaned piglets.

Enterotoxigenic Escherichia coli (ETEC) is a common diarrheal pathogen in humans and animals. To prevent and treat ETEC induced diarrhea, we synthesized mannan oligosaccharide selenium (MOSS) and studied its beneficial effect on ETEC-induced diarrhea. A total of 32 healthy weaned piglets (6.69 ± 0.01 kg) were randomly divided into four groups: NC group (Basal diet), MOSS group (0.4 mg/kg MOSS supplemented diet), MOET group (0.4 mg/kg MOSS supplemented diet + ETEC treatment), ETEC group (ETEC treatment). NC and ETEC group fed with basal diet, MOSS and MOET group fed with the MOSS supplemented diet. On the 8th and 15th day of the experiment, MOET and ETEC group were gavaged with ETEC, and NC and MOSS group were gavaged with stroke-physiological saline solution. Our data showed that dietary MOSS supplementation increased average daily gain (ADG) and average daily feed intake (ADFI) and significantly decreased diarrhea index and frequency in ETEC-treated piglets. MOSS did not affect the α diversity and ß diversity of ileal microbial community, but it significantly decreased the proportion of lipopolysaccharide biosynthesis in ileal microbial community. MOSS supplementation regulated colonic microbiota community composition, which significantly increased carbohydrate metabolism, and inhibited lipopolysaccharide biosynthesis pathway in colonic microbial community. Moreover, MOSS significantly decreased inflammatory stress, and oxidative stress in ETEC treated piglets. Furthermore, dietary MOSS supplementation significantly decreased intestinal barrier permeability, and alleviated ETEC induced intestinal mucosa barrier irritation. In conclusion, our study showed that dietary MOSS supplementation ameliorated intestinal mucosa barrier, and regulated intestinal microbiota to prevent ETEC induced diarrhea in weaned piglets.

Microbiota intestinal y cólicos infantiles: ¿hay lugar para los prebióticos, probióticos y posbióticos? / Gut Microbiota and Infant Colic: is there a Place for Prebiotics, Probiotics, and Postbiotics?

El consumo de probióticos, prebióticos y posbióticos, o su combinación, puede contribuir a mantener una microbiota intestinal saludable ya que permite la regulación de su disbiosis en el caso de algunas enfermedades o trastornos, principalmente en los trastornos gastrointestinales funcionales (TGIF). El microbioma intestinal es protagonista esencial en la fisiopatología de los TGIF a través de sus funciones metabólicas y nutricionales, el mantenimiento de la integridad de la mucosa intestinal y la regulación de la respuesta inmunitaria. Las investigaciones realizadas hasta la fecha indican que los probióticos, prebióticos y posbióticos pueden tener efectos inmunomoduladores directos y clínicamente relevantes. Existen pruebas del uso de esta familia de bióticos en individuos sanos para mejorar la salud general y aliviar los síntomas en una serie de enfermedades como los cólicos infantiles. La colonización y establecimiento de la microbiota comienza en el momento del nacimiento; los primeros 2-3 años de vida son fundamentales para el desarrollo de una comunidad microbiana abundante y diversa. Diversos estudios científicos realizados mediante técnicas tradicionales dependientes de cultivo y más recientemente por técnicas moleculares han observado diferencias en las poblaciones bacterianas de bebés sanos y aquellos que sufren TGIF, estos últimos caracterizados por un aumento de especies patógenas y una menor población de bifidobacterias y lactobacilos, en comparación con los primeros. En tal contexto, se considera que la microbiota intestinal como protagonista en el desarrollo de esos trastornos, entre ellos los cólicos infantiles, a través de sus funciones metabólicas, nutricionales, de mantenimiento de la integridad de la mucosa intestinal y regulación de la respuesta inmunitaria. Esto ha abierto la puerta al estudio de la utilización de prebióticos, probióticos y posbióticos en el tratamiento y/o prevención de los TGIF infantiles. El parto vaginal y de término así como la lactancia son fundamentales en la constitución de una microbiota saludable. Como herramientas de apoyo, existen estudios de eficacia que sustentan la administración de esta familia de bióticos, principalmente en los casos en que la lactancia no sea posible o esté limitada. (AU)

The consumption of probiotics, prebiotics, and postbiotics, or a combination of them, can contribute to maintaining a healthy intestinal microbiota as it allows the regulation of its dysbiosis in the case of some diseases or disorders, mainly in functional gastrointestinal disorders (FGIDs). The gut microbiome is an essential player in the pathophysiology of FGIDs through its metabolic and nutritional functions, the maintenance of intestinal mucosal integrity, and the regulation of the immune response. Research results thus far indicate that probiotics, prebiotics, and postbiotics may have direct and clinically relevant immunomodulatory effects. There is evidence regarding the prescription of this family of biotics in healthy individuals to improve overall health and alleviate symptoms in many conditions like infantile colic. The colonization and microbiota establishment begins at birth; the first 2-3 years of life are critical for developing an abundant and diverse microbial community. Several scientific studies performed by traditional culture-dependent techniques and more recently by molecular techniques have observed differences in the bacterial populations of healthy infants and those suffering from FGIDs, the latter characterized by an increase in pathogenic species and a lower population of bifidobacteria and lactobacilli, compared to the former. In this context, the intestinal microbiota plays a leading role in the onset of these disorders, including infantile colic, through its metabolic and nutritional functions, maintenance of the integrity of the intestinal mucosa, and regulation of the immune response. That has opened the door to the study of prebiotics, probiotics, and postbiotics usage in the treatment and or prevention of infantile FGIDs. Vaginal and term delivery and breastfeeding are fundamental in the constitution of a healthy microbiota. As supportive tools, there are efficacy studies that support the administration of this family of biotics, mainly in cases where lactation is not possible or is limited.

In vitro prebiotic activity of rhLf and galactooligosaccharides on infant intestinal microbiota.

Introduction: Objective: human lactoferrin (Lf) and human milk oligosaccharides possess a wide range of functions. So, the present study focusses on the role of Lf and/or galactooligosaccharides (GOS) in the modulation of gut microbiota composition. Methods: recombinant human lactoferrin (rhLf) was added to the first infant formula (0.10, 0.15, 0.20 %) alone or in combination with GOS (1 %) in vessels of a small-scale batch culture fermentation model. Short-chain fatty acids (SCFAs), microbial population groups, and pH were monitored through fermentation for 24 hours. Results: insignificant changes were observed in pH values and acetic acid accumulated during fermentation. Propionic acid content has been insignificantly increased while butyric acid has been insignificantly decreased. Moreover, increments in all bacterial groups except for Bacteroides were observed through the fermentation process. Lactobacillus and Bifidobacterium showed an increase in relation to initial time over the fermentation process, demonstrating the prebiotic effect of lactoferrin and GOS. After 24 hours of fermentation, all tested ingredients showed significant similarities in Enterococcus for controls except for 0.20 % rhLf + 1 % GOS, which provoked a diminution of Enterococci growth. Conclusion: despite the importance of the batch culture fermentation technique in uncovering the prebiotic activity of food ingredients, it is not useful for detecting the prebiotic nature of Lf due to its nature as a protein. Thus, Lf maybe shows its prebiotic activity on the gut microbiota through other mechanisms.

Introducción: Objetivo: la lactoferrina humana (Lf) y los oligosacáridos de leche materna presentan un amplio rango de funciones. El presente estudio se centra en el papel de la Lf y/o galactooligosácridos (GOS) en la modulación de la composición de la microbiota intestinal. Métodos: se añadió lactoferrina humana recombinante (rhLf) a fórmula infantil (0,10, 0,15, 0,20 %), sola o en combinación con GOS (1 %) en botes de fermentación colónica. A lo largo de 24 horas de fermentación, se monitorizaron ácidos grasos de cadena corta, grupos de poblaciones microbianas y pH. Resultados: se observaron pequeños cambios en valores de pH y cantidad de ácido acético durante la fermentación. El contenido de ácido propiónico aumentó ligeramente, mientras que el butírico sufrió un ligero descenso. Todos los grupos bacterianos estudiados incrementaron, excepto los Bacteroides, durante la fermentación. Lactobacillus and Bifidobacterium mostraron un incremento respecto al valor inicial, demostrando el efecto prebiótico de la lactoferrina y los GOS. A las 24 horas de fermentación, todos los ingredientes estudiados mostraron similitud al control en cuanto a Enterococcus, excepto para 0,20 % rhLf + 1 % GOS, donde disminuyó el crecimiento de los enterococos. Conclusión: a pesar de la importancia de los estudios de fermentación in vitro para descubrir potenciales ingredientes prebióticos, no fue útil en el caso de lactoferrina debido a su naturaleza proteica. Por tanto, la lactoferrina podría mostrar su actividad prebiótica en la microbiota intestinal a través de otros mecanismos.

[Translated article] Pilot study to determine the association between gut microbiota and fragility hip fracture.

INTRODUCTION: Hip fractures are the most common cause of hospital admission to orthopaedic departments in Europe and they generate a major health problem. Therefore, it is of great interest to identify additional risk factors that will help us to better understand the pathophysiology of these fractures and improve our preventive capacity. There is sufficient data to support the theory of modulation of bone mass by gut microbiota (osteomicrobiology); however, there is a lack of human clinical studies directly linking microbiota to hip fracture risk. MATERIAL AND METHODS: Observational, analytical, case-control study. The sample consisted of 50 patients and it was distributed as follows: 25 elderly patients with fragility hip fracture and 25 subjects without fracture. The intestinal microbiota was determined by DNA extraction from stool samples and 16S ribosomal DNA sequencing after generation of gene libraries. RESULTS: Alpha diversity revealed an elevation of the estimators for the taxonomic class level in the hip fracture group. The orders Bacteroidales, Oscillospirales, Lachnospirales, Peptostreptococcales-Tissierellales and Enterobacterales were the dominant orders in both groups. In patients with fracture, a significant percentage increase in the orders Bacteroidales (p<.001) and Peptostreptococcales-Tissierellales (p<.005) was observed, as well as a decrease in the orders Lachnospirales (p<.001) compared to controls. CONCLUSIONS: This study has found an association between a specific microbiota in elderly patients with fragility hip fracture. These findings open the door to new strategies to prevent hip fractures. Modification of the microbiota through probiotics may prove to be an effective method to reduce the risk of hip fracture.

Pilot study to determine the association between gut microbiota and fragility hip fracture. / Estudio piloto para determinar la asociación entre la microbiota intestinal y la fractura de cadera por fragilidad.

INTRODUCTION: Hip fractures are the most common cause of hospital admission to orthopaedic departments in Europe and they generate a major health problem. Therefore, it is of great interest to identify additional risk factors that will help us to better understand the pathophysiology of these fractures and improve our preventive capacity. There is sufficient data to support the theory of modulation of bone mass by gut microbiota (osteomicrobiology); however, there is a lack of human clinical studies directly linking microbiota to hip fracture risk. MATERIAL AND METHODS: Observational, analytical, case-control study. The sample consisted of 50 patients and it was distributed as follows: 25 elderly patients with fragility hip fracture and 25 subjects without fracture. The intestinal microbiota was determined by DNA extraction from stool samples and 16S ribosomal DNA sequencing after generation of gene libraries. RESULTS: Alpha diversity revealed an elevation of the estimators for the taxonomic class level in the hip fracture group. The orders Bacteroidales, Oscillospirales, Lachnospirales, Peptostreptococcales-Tissierellales and Enterobacterales were the dominant orders in both groups. In patients with fracture, a significant percentage increase in the orders Bacteroidales (p<.001) and Peptostreptococcales-Tissierellales (p<.005) was observed, as well as a decrease in the orders Lachnospirales (p<.001) compared to controls. CONCLUSIONS: This study has found an association between a specific microbiota in elderly patients with fragility hip fracture. These findings open the door to new strategies to prevent hip fractures. Modification of the microbiota through probiotics may prove to be an effective method to reduce the risk of hip fracture.

A doença de Alzheimer e sua relação com o eixo microbiota-intestino-cérebro / Alzheimer's disease and its relationship with the microbiota-gut-brain axis

ABSTRACT Background: Alzheimer's disease (AD) is a progressive and irreversible neurodegenerative disease, characterized by the accumulation of amyloid plaques and neurofibrillary tangles in the brain. Several pathways enable bidirectional communication between the central nervous system (CNS), the intestine and its microbiota, constituting the microbiota-gut-brain axis. Objective: Review the pathophysiology of AD, relate it to the microbiota-gut-brain axis and discuss the possibility of using probiotics in the treatment and/or prevention of this disease. Methods: Search of articles from the PubMed database published in the last 5 years (2017 to 2022) structure the narrative review. Results: The composition of the gut microbiota influences the CNS, resulting in changes in host behavior and may be related to the development of neurodegenerative diseases. Some metabolites produced by the intestinal microbiota, such as trimethylamine N-oxide (TMAO), may be involved in the pathogenesis of AD, while other compounds produced by the microbiota during the fermentation of food in the intestine, such as D-glutamate and fatty acids short chain, are beneficial in cognitive function. The consumption of live microorganisms beneficial to health, known as probiotics, has been tested in laboratory animals and humans to evaluate the effect on AD. Conclusion: Although there are few clinical trials evaluating the effect of probiotic consumption in humans with AD, the results to date indicate a beneficial contribution of the use of probiotics in this disease.

RESUMO Contexto: A doença de Alzheimer (DA) é uma doença neurodegenerativa progressiva e irreversível, caracterizada pelo acúmulo de placas amiloides e emaranhados neurofibrilares no cérebro. Diversas vias possibilitam uma comunicação bidirecional entre o sistema nervoso central (SNC), o intestino e sua microbiota, constituindo o eixo microbiota-intestino-cérebro. Objetivo Revisar a fisiopatogenia da DA, relacioná-la com o eixo microbiota-intestino-cérebro e discutir sobre a possibilidade do uso de probióticos no tratamento e/ou prevenção desta doença. Métodos: Busca de artigos da base de dados PubMed publicados nos últimos 5 anos (2017 a 2022) para estruturar a revisão narrativa. Resultados A composição da microbiota intestinal influencia o SNC, resultando em modificações no comportamento do hospedeiro e pode estar relacionada com o desenvolvimento de doenças neurodegenerativas. Alguns metabólitos produzidos pela microbiota intestinal, como o N-óxido de trimetilamina (TMAO), podem estar envolvidos na patogênese da DA, enquanto, outros compostos produzidos pela microbiota durante a fermentação de alimentos no intestino, como o D-glutamato e os ácidos graxos de cadeia curta, são profícuos na função cognitiva. O consumo de microrganismos vivos benéficos à saúde, os probióticos, tem sido testado em animais de laboratório e humanos para avaliação do efeito na DA. Conclusão Embora haja poucos ensaios clínicos que avaliem o efeito do consumo de probióticos em humanos com DA, os resultados até o momento indicam uma contribuição benéfica do uso de probióticos nesta doença.

Gut dysbiosis, inflammation and type 2 diabetes in mice using synthetic gut microbiota from diabetic humans

Abstract The study was aimed to assess impact of high fat diet (HFD) and synthetic human gut microbiota (GM) combined with HFD and chow diet (CD) in inducing type-2 diabetes (T2D) using mice model. To our knowledge, this is the first study using selected human GM transplantation via culture based method coupled dietary modulation in mice for in vivo establishment of inflammation leading to T2D and gut dysbiosis. Twenty bacteria (T2D1-T2D20) from stool samples of confirmed T2D subjects were found to be morphologically different and subjected to purification on different media both aerobically and anerobically, which revealed seven bacteria more common among 20 isolates on the basis of biochemical characterization. On the basis of 16S rRNA gene sequencing, these seven isolates were identified as Bacteroides stercoris (MT152636), Lactobacillus acidophilus (MT152637), Lactobacillus salivarius (MT152638), Ruminococcus bromii (MT152639), Klebsiella aerogenes (MT152640), Bacteroides fragilis (MT152909), Clostridium botulinum (MT152910). The seven isolates were subsequently used as synthetic gut microbiome (GM) for their role in inducing T2D in mice. Inbred strains of albino mice were divided into four groups and were fed with CD, HFD, GM+HFD and GM+CD. Mice receiving HFD and GM+modified diet (CD/HFD) showed highly significant (P 0.05) increase in weight and blood glucose concentration as well as elevated level of inflammatory cytokines (TNF-, IL-6, and MCP-1) compared to mice receiving CD only. The 16S rRNA gene sequencing of 11 fecal bacteria obtained from three randomly selected animals from each group revealed gut dysbiosis in animals receiving GM. Bacterial strains including Bacteroides gallinarum (MT152630), Ruminococcus bromii (MT152631), Lactobacillus acidophilus (MT152632), Parabacteroides gordonii (MT152633), Prevotella copri (MT152634) and Lactobacillus gasseri (MT152635) were isolated from mice treated with GM+modified diet (HFD/CD) compared to strains Akkermansia muciniphila (MT152625), Bacteriodes sp. (MT152626), Bacteroides faecis (MT152627), Bacteroides vulgatus (MT152628), Lactobacillus plantarum (MT152629) which were isolated from mice receiving CD/HFD. In conclusion, these findings suggest that constitution of GM and diet plays significant role in inflammation leading to onset or/and possibly progression of T2D. .

Resumo O estudo teve como objetivo avaliar o impacto da dieta rica em gordura (HFD) e da microbiota intestinal humana sintética (GM) combinada com HFD e dieta alimentar (CD) na indução de diabetes tipo 2 (T2D) usando modelo de camundongos. Para nosso conhecimento, este é o primeiro estudo usando transplante de GM humano selecionado através do método baseado em cultura acoplada à modulação dietética em camundongos para o estabelecimento in vivo de inflamação que leva a T2D e disbiose intestinal. Vinte bactérias (T2D1-T2D20) de amostras de fezes de indivíduos T2D confirmados verificaram ser morfologicamente diferentes e foram submetidas à purificação em meios diferentes aerobicamente e anaerobicamente, o que revelou sete bactérias mais comuns entre 20 isolados com base na caracterização bioquímica. Com base no sequenciamento do gene 16S rRNA, esses sete isolados foram identificados como Bacteroides stercoris (MT152636), Lactobacillus acidophilus (MT152637), Lactobacillus salivarius (MT152638), Ruminococcus bromii (MT152639), Klebsiella aerogenides (MT152640), Bacteroides fragilis (MT152909), Clostridium botulinum (MT152910). Esses sete isolados foram, posteriormente, usados como microbioma intestinal sintético (GM) por seu papel na indução de T2D em camundongos. Linhagens consanguíneas de camundongos albinos foram divididas em quatro grupos e foram alimentadas com CD, HFD, GM + HFD e GM + CD. Camundongos que receberam a dieta modificada com HFD e GM + (CD / HFD) mostraram um aumento altamente significativo (P 0,05) no peso e na concentração de glicose no sangue, bem como um nível elevado de citocinas inflamatórias (TNF-, IL-6 e MCP-1) em comparação com os ratos que receberam apenas CD. O sequenciamento do gene 16S rRNA de 11 bactérias fecais obtidas de três animais selecionados aleatoriamente de cada grupo revelou disbiose intestinal em animais que receberam GM. Cepas bacterianas, incluindo Bacteroides gallinarum (MT152630), Ruminococcus bromii (MT152631), Lactobacillus acidophilus (MT152632), Parabacteroides gordonii (MT152633), Prevotella copri (MT152634) e Lactobacillus Gasseri (MT152635D), foram tratadas com dieta modificada / CD) em comparação com as linhagens Akkermansia muciniphila (MT152625), Bacteriodes sp. (MT152626), Bacteroides faecis (MT152627), Bacteroides vulgatus (MT152628), Lactobacillus plantarum (MT152629), que foram isoladas de camundongos recebendo CD / HFD. Em conclusão, esses resultados sugerem que a constituição de GM e dieta desempenham papel significativo na inflamação levando ao início ou/e possivelmente à progressão de T2D.

Gut dysbiosis, inflammation and type 2 diabetes in mice using synthetic gut microbiota from diabetic humans / Disbiose intestinal, inflamação e diabetes tipo 2 em camundongos usando microbiota intestinal sintética de humanos diabéticos

Abstract The study was aimed to assess impact of high fat diet (HFD) and synthetic human gut microbiota (GM) combined with HFD and chow diet (CD) in inducing type-2 diabetes (T2D) using mice model. To our knowledge, this is the first study using selected human GM transplantation via culture based method coupled dietary modulation in mice for in vivo establishment of inflammation leading to T2D and gut dysbiosis. Twenty bacteria (T2D1-T2D20) from stool samples of confirmed T2D subjects were found to be morphologically different and subjected to purification on different media both aerobically and anerobically, which revealed seven bacteria more common among 20 isolates on the basis of biochemical characterization. On the basis of 16S rRNA gene sequencing, these seven isolates were identified as Bacteroides stercoris (MT152636), Lactobacillus acidophilus (MT152637), Lactobacillus salivarius (MT152638), Ruminococcus bromii (MT152639), Klebsiella aerogenes (MT152640), Bacteroides fragilis (MT152909), Clostridium botulinum (MT152910). The seven isolates were subsequently used as synthetic gut microbiome (GM) for their role in inducing T2D in mice. Inbred strains of albino mice were divided into four groups and were fed with CD, HFD, GM+HFD and GM+CD. Mice receiving HFD and GM+modified diet (CD/HFD) showed highly significant (P<0.05) increase in weight and blood glucose concentration as well as elevated level of inflammatory cytokines (TNF-α, IL-6, and MCP-1) compared to mice receiving CD only. The 16S rRNA gene sequencing of 11 fecal bacteria obtained from three randomly selected animals from each group revealed gut dysbiosis in animals receiving GM. Bacterial strains including Bacteroides gallinarum (MT152630), Ruminococcus bromii (MT152631), Lactobacillus acidophilus (MT152632), Parabacteroides gordonii (MT152633), Prevotella copri (MT152634) and Lactobacillus gasseri (MT152635) were isolated from mice treated with GM+modified diet (HFD/CD) compared to strains Akkermansia muciniphila (MT152625), Bacteriodes sp. (MT152626), Bacteroides faecis (MT152627), Bacteroides vulgatus (MT152628), Lactobacillus plantarum (MT152629) which were isolated from mice receiving CD/HFD. In conclusion, these findings suggest that constitution of GM and diet plays significant role in inflammation leading to onset or/and possibly progression of T2D. .

Resumo O estudo teve como objetivo avaliar o impacto da dieta rica em gordura (HFD) e da microbiota intestinal humana sintética (GM) combinada com HFD e dieta alimentar (CD) na indução de diabetes tipo 2 (T2D) usando modelo de camundongos. Para nosso conhecimento, este é o primeiro estudo usando transplante de GM humano selecionado através do método baseado em cultura acoplada à modulação dietética em camundongos para o estabelecimento in vivo de inflamação que leva a T2D e disbiose intestinal. Vinte bactérias (T2D1-T2D20) de amostras de fezes de indivíduos T2D confirmados verificaram ser morfologicamente diferentes e foram submetidas à purificação em meios diferentes aerobicamente e anaerobicamente, o que revelou sete bactérias mais comuns entre 20 isolados com base na caracterização bioquímica. Com base no sequenciamento do gene 16S rRNA, esses sete isolados foram identificados como Bacteroides stercoris (MT152636), Lactobacillus acidophilus (MT152637), Lactobacillus salivarius (MT152638), Ruminococcus bromii (MT152639), Klebsiella aerogenides (MT152640), Bacteroides fragilis (MT152909), Clostridium botulinum (MT152910). Esses sete isolados foram, posteriormente, usados ​​como microbioma intestinal sintético (GM) por seu papel na indução de T2D em camundongos. Linhagens consanguíneas de camundongos albinos foram divididas em quatro grupos e foram alimentadas com CD, HFD, GM + HFD e GM + CD. Camundongos que receberam a dieta modificada com HFD e GM + (CD / HFD) mostraram um aumento altamente significativo (P < 0,05) no peso e na concentração de glicose no sangue, bem como um nível elevado de citocinas inflamatórias (TNF-α, IL-6 e MCP-1) em comparação com os ratos que receberam apenas CD. O sequenciamento do gene 16S rRNA de 11 bactérias fecais obtidas de três animais selecionados aleatoriamente de cada grupo revelou disbiose intestinal em animais que receberam GM. Cepas bacterianas, incluindo Bacteroides gallinarum (MT152630), Ruminococcus bromii (MT152631), Lactobacillus acidophilus (MT152632), Parabacteroides gordonii (MT152633), Prevotella copri (MT152634) e Lactobacillus Gasseri (MT152635D), foram tratadas com dieta modificada / CD) em comparação com as linhagens Akkermansia muciniphila (MT152625), Bacteriodes sp. (MT152626), Bacteroides faecis (MT152627), Bacteroides vulgatus (MT152628), Lactobacillus plantarum (MT152629), que foram isoladas de camundongos recebendo CD / HFD. Em conclusão, esses resultados sugerem que a constituição de GM e dieta desempenham papel significativo na inflamação levando ao início ou/e possivelmente à progressão de T2D.

Gut dysbiosis, inflammation and type 2 diabetes in mice using synthetic gut microbiota from diabetic humans / Disbiose intestinal, inflamação e diabetes tipo 2 em camundongos usando microbiota intestinal sintética de humanos diabéticos

The study was aimed to assess impact of high fat diet (HFD) and synthetic human gut microbiota (GM) combined with HFD and chow diet (CD) in inducing type-2 diabetes (T2D) using mice model. To our knowledge, this is the first study using selected human GM transplantation via culture based method coupled dietary modulation in mice for in vivo establishment of inflammation leading to T2D and gut dysbiosis. Twenty bacteria (T2D1-T2D20) from stool samples of confirmed T2D subjects were found to be morphologically different and subjected to purification on different media both aerobically and anerobically, which revealed seven bacteria more common among 20 isolates on the basis of biochemical characterization. On the basis of 16S rRNA gene sequencing, these seven isolates were identified as Bacteroides stercoris (MT152636), Lactobacillus acidophilus (MT152637), Lactobacillus salivarius (MT152638), Ruminococcus bromii (MT152639), Klebsiella aerogenes (MT152640), Bacteroides fragilis (MT152909), Clostridium botulinum (MT152910). The seven isolates were subsequently used as synthetic gut microbiome (GM) for their role in inducing T2D in mice. Inbred strains of albino mice were divided into four groups and were fed with CD, HFD, GM+HFD and GM+CD. Mice receiving HFD and GM+modified diet (CD/HFD) showed highly significant (P<0.05) increase in weight and blood glucose concentration as well as elevated level of inflammatory cytokines (TNF-α, IL-6, and MCP-1) compared to mice receiving CD only. The 16S rRNA gene sequencing of 11 fecal bacteria obtained from three randomly selected animals from each group revealed gut dysbiosis in animals receiving GM. Bacterial strains including Bacteroides gallinarum (MT152630), Ruminococcus bromii (MT152631), Lactobacillus acidophilus (MT152632), Parabacteroides gordonii (MT152633), Prevotella copri (MT152634) and Lactobacillus gasseri (MT152635) were isolated from mice [...].

O estudo teve como objetivo avaliar o impacto da dieta rica em gordura (HFD) e da microbiota intestinal humana sintética (GM) combinada com HFD e dieta alimentar (CD) na indução de diabetes tipo 2 (T2D) usando modelo de camundongos. Para nosso conhecimento, este é o primeiro estudo usando transplante de GM humano selecionado através do método baseado em cultura acoplada à modulação dietética em camundongos para o estabelecimento in vivo de inflamação que leva a T2D e disbiose intestinal. Vinte bactérias (T2D1-T2D20) de amostras de fezes de indivíduos T2D confirmados verificaram ser morfologicamente diferentes e foram submetidas à purificação em meios diferentes aerobicamente e anaerobicamente, o que revelou sete bactérias mais comuns entre 20 isolados com base na caracterização bioquímica. Com base no sequenciamento do gene 16S rRNA, esses sete isolados foram identificados como Bacteroides stercoris (MT152636), Lactobacillus acidophilus (MT152637), Lactobacillus salivarius (MT152638), Ruminococcus bromii (MT152639), Klebsiella aerogenides (MT152640), Bacteroides fragilis (MT152909), Clostridium botulinum (MT152910). Esses sete isolados foram, posteriormente, usados como microbioma intestinal sintético (GM) por seu papel na indução de T2D em camundongos. Linhagens consanguíneas de camundongos albinos foram divididas em quatro grupos e foram alimentadas com CD, HFD, GM + HFD e GM + CD. Camundongos que receberam a dieta modificada com HFD e GM + (CD / HFD) mostraram um aumento altamente significativo (P < 0,05) no peso e na concentração de glicose no sangue, bem como um nível elevado de citocinas inflamatórias (TNF-α, IL-6 e MCP-1) em comparação com os ratos que receberam apenas CD. O sequenciamento do gene 16S rRNA de 11 bactérias fecais obtidas de três animais selecionados aleatoriamente de cada grupo revelou disbiose intestinal em animais que receberam GM. Cepas bacterianas, incluindo Bacteroides gallinarum (MT152630), Ruminococcus [...].

Gut microbiota composition after a dietary and physical activity intervention: a pilot study in Mexican children with obesity.

BACKGROUND: Gut microbiota is a complex organized collection of microorganisms that confers multiple metabolic advantages to the host. The reduced diversity and proportion of specific gut microbial species have been associated with obesity and metabolic disorders. Multidimensional interventions, including modifications in dietary and physical activity habits, are associated with favorable changes in microbiota composition. This pilot study aimed to evaluate changes in the gut microbiota composition of Mexican children with obesity before and after a 6-week multidimensional intervention. METHODS: Blood and stool samples were collected, and anthropometric measurements were obtained from six children with obesity before and after the intervention. The intervention consisted of modeling a hypo energetic diet and giving nutritional and physical activation recommendations. DNA from stool samples was used to characterize gut microbial composition by sequencing the 16S rRNA gene. RESULTS: The decrease in waist circumference was associated with increased Odoribacter relative abundance. However, gut microbiota composition and diversity remained unchanged. CONCLUSIONS: Although no modifications in the body mass index, body fat, composition, or diversity of the gut microbiota were observed with the intervention, it was possible to associate the reduction in waist circumference with the presence of Odoribacter after a multidimensional intervention in Mexican children with obesity.

INTRODUCCIÓN: La microbiota intestinal es un conjunto de microorganismos organizados de forma compleja que confieren múltiples ventajas metabólicas al hospedero. La reducida diversidad y la proporción de ciertas especies sobre otras se ha asociado con obesidad y enfermedades metabólicas. Las intervenciones multidimensionales, que incluyen modificaciones en los hábitos alimentarios y de actividad física, se asocian con cambios favorables en la composición de la microbiota. El objetivo de este estudio piloto fue evaluar la composición de la microbiota intestinal de niños mexicanos con obesidad, antes y después de una intervención multidimensional de seis semanas de duración. MÉTODOS: Se tomaron muestras de sangre y de heces y se realizaron las mediciones antropométricas de seis niños con obesidad, antes y después de la intervención. La intervención consistió en modelar una dieta hipoenergética y dar recomendaciones nutricias y de actividad física. A partir del DNA de las muestras de heces se realizó la caracterización de la microbiota intestinal por secuenciación del gen 16S del RNAr. RESULTADOS: La disminución de la circunferencia de cintura se asoció con un aumento en la abundancia del género Odoribacter. Sin embargo, no se encontraron cambios en la composición de la microbiota intestinal. CONCLUSIONES: A pesar de que la intervención no modificó el índice de masa corporal, masa grasa, composición ni diversidad de la microbiota intestinal, sí se logró asociar la reducción de la circunferencia de cintura con la abundancia de Odoribacter en el presente estudio piloto en niños mexicanos con obesidad.

Gut microbiota composition after a dietary and physical activity intervention: a pilot study in Mexican children with obesity / Efecto de una intervención nutricia y de actividad física sobre la composición de la microbiota intestinal: un estudio piloto en niños mexicanos con obesidad

Abstract Background: Gut microbiota is a complex organized collection of microorganisms that confers multiple metabolic advantages to the host. The reduced diversity and proportion of specific gut microbial species have been associated with obesity and metabolic disorders. Multidimensional interventions, including modifications in dietary and physical activity habits, are associated with favorable changes in microbiota composition. This pilot study aimed to evaluate changes in the gut microbiota composition of Mexican children with obesity before and after a 6-week multidimensional intervention. Methods: Blood and stool samples were collected, and anthropometric measurements were obtained from six children with obesity before and after the intervention. The intervention consisted of modeling a hypo energetic diet and giving nutritional and physical activation recommendations. DNA from stool samples was used to characterize gut microbial composition by sequencing the 16S rRNA gene. Results: The decrease in waist circumference was associated with increased Odoribacter relative abundance. However, gut microbiota composition and diversity remained unchanged. Conclusions: Although no modifications in the body mass index, body fat, composition, or diversity of the gut microbiota were observed with the intervention, it was possible to associate the reduction in waist circumference with the presence of Odoribacter after a multidimensional intervention in Mexican children with obesity.

Resumen Introducción: La microbiota intestinal es un conjunto de microorganismos organizados de forma compleja que confieren múltiples ventajas metabólicas al hospedero. La reducida diversidad y la proporción de ciertas especies sobre otras se ha asociado con obesidad y enfermedades metabólicas. Las intervenciones multidimensionales, que incluyen modificaciones en los hábitos alimentarios y de actividad física, se asocian con cambios favorables en la composición de la microbiota. El objetivo de este estudio piloto fue evaluar la composición de la microbiota intestinal de niños mexicanos con obesidad, antes y después de una intervención multidimensional de seis semanas de duración. Métodos: Se tomaron muestras de sangre y de heces y se realizaron las mediciones antropométricas de seis niños con obesidad, antes y después de la intervención. La intervención consistió en modelar una dieta hipoenergética y dar recomendaciones nutricias y de actividad física. A partir del DNA de las muestras de heces se realizó la caracterización de la microbiota intestinal por secuenciación del gen 16S del RNAr. Resultados: La disminución de la circunferencia de cintura se asoció con un aumento en la abundancia del género Odoribacter. Sin embargo, no se encontraron cambios en la composición de la microbiota intestinal. Conclusiones: A pesar de que la intervención no modificó el índice de masa corporal, masa grasa, composición ni diversidad de la microbiota intestinal, sí se logró asociar la reducción de la circunferencia de cintura con la abundancia de Odoribacter en el presente estudio piloto en niños mexicanos con obesidad.

Microbiota intestinal en la salud humana / Gut microbiota in human health

Introducción: La microbiota describe a un grupo de microorganismos en una región o período de tiempo que incluye: bacterias, arqueas, protistas, hongos y virus. Objetivos: Explicar la función de la microbiota intestinal en la salud humana. Métodos: Se realizó una búsqueda en diferentes de bases de datos como NHI, Ebsco y PubMed en idioma español e inglés, se revisó un total de 17 artículos de los cuales el mayor por ciento es de menos de 5 años. Resultados: Las microbiota intestinal en su mayoría se compone de Gram negativa, con una pared celular rica en lipopolisacáridos (LPS) que potencia a la inmunidad innata por interacción de receptor Toll-like (TLR) ligando, desencadena la producción de citoquinas proinflamatorias, entre otros. Conclusiones: La microbiota intestinal funciona como un señalizador antiinflamatorio y regulador de la permeabilidad epitelial intestinal(AU)

Introduction: Microbiota describes a group of microorganisms in a region or period of time that includes bacteria, archaea, protists, fungi, and viruses. Objectives: To explain the role of the intestinal microbiota in human health. Methods: A search was carried out in different databases such as NHI, Ebsco and PubMed in Spanish and English, a total of 17 articles were reviewed, most of them are less than 5 years. Results: Intestinal microbiota is mostly composed of Gram negative, with a cell wall rich in lipopolysaccharides (LPS) that enhances innate immunity by Toll-like receptor (TLR) ligand interaction, triggers the production of proinflammatory cytokines, among others. Conclusions: Intestinal microbiota functions as an anti-inflammatory signaling agent and regulator of intestinal epithelial permeability(AU)