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1.
Cell ; 175(2): 372-386.e17, 2018 10 04.
Artículo en Inglés | MEDLINE | ID: mdl-30270042

RESUMEN

Intestinal mesenchymal cells play essential roles in epithelial homeostasis, matrix remodeling, immunity, and inflammation. But the extent of heterogeneity within the colonic mesenchyme in these processes remains unknown. Using unbiased single-cell profiling of over 16,500 colonic mesenchymal cells, we reveal four subsets of fibroblasts expressing divergent transcriptional regulators and functional pathways, in addition to pericytes and myofibroblasts. We identified a niche population located in proximity to epithelial crypts expressing SOX6, F3 (CD142), and WNT genes essential for colonic epithelial stem cell function. In colitis, we observed dysregulation of this niche and emergence of an activated mesenchymal population. This subset expressed TNF superfamily member 14 (TNFSF14), fibroblastic reticular cell-associated genes, IL-33, and Lysyl oxidases. Further, it induced factors that impaired epithelial proliferation and maturation and contributed to oxidative stress and disease severity in vivo. Our work defines how the colonic mesenchyme remodels to fuel inflammation and barrier dysfunction in IBD.


Asunto(s)
Enfermedades Inflamatorias del Intestino/fisiopatología , Mesodermo/fisiología , Animales , Proliferación Celular , Colitis/genética , Colitis/fisiopatología , Colon/fisiología , Células Epiteliales/metabolismo , Fibroblastos/fisiología , Heterogeneidad Genética , Homeostasis , Humanos , Inflamación , Mucosa Intestinal/inmunología , Mucosa Intestinal/fisiología , Intestinos/inmunología , Intestinos/fisiología , Células Madre Mesenquimatosas/fisiología , Mesodermo/metabolismo , Ratones , Ratones Endogámicos C57BL , Miofibroblastos , Pericitos , Células RAW 264.7 , Factores de Transcripción SOXD/fisiología , Análisis de la Célula Individual/métodos , Tromboplastina/fisiología , Miembro 14 de la Superfamilia de Ligandos de Factores de Necrosis Tumoral/genética , Vía de Señalización Wnt/fisiología
2.
J Mol Cell Cardiol ; 191: 12-22, 2024 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-38643934

RESUMEN

Doxorubicin (DOX) is a widely used chemotherapeutic agent that can cause serious cardiotoxic side effects, leading to heart failure (HF). Impaired mitochondrial function is thought to be key factor driving progression into HF. We have previously shown in a rat model of DOX-HF that heart failure with reduced ejection fraction correlates with mitochondrial loss and dysfunction. Adenosine monophosphate-dependent kinase (AMPK) is a cellular energy sensor, regulating mitochondrial biogenesis and energy metabolism, including fatty acid oxidation. We hypothesised that AMPK activation could restore mitochondrial function and therefore be a novel cardioprotective strategy for the prevention of DOX-HF. Consequently, we set out to assess whether 5-aminoimidazole-4-carboxamide 1-ß-D-ribofuranoside (AICAR), an activator of AMPK, could prevent cardiac functional decline in this chronic intravenous rat model of DOX-HF. In line with our hypothesis, AICAR improved cardiac systolic function. AICAR furthermore improved cardiac mitochondrial fatty acid oxidation, independent of mitochondrial number, and in the absence of observable AMPK-activation. In addition, we found that AICAR prevented loss of myocardial mass. RNAseq analysis showed that this may be driven by normalisation of pathways associated with ribosome function and protein synthesis, which are impaired in DOX-treated rat hearts. AICAR furthermore prevented dyslipidemia and excessive body-weight loss in DOX-treated rats, which may contribute to preservation of myocardial mass. Though it is unclear whether AICAR exerted its cardioprotective effect through cardiac or extra-cardiac AMPK-activation or via an AMPK-independent effect, these results show promise for the use of AICAR as a cardioprotective agent in DOX-HF to both preserve cardiac function and mass.


Asunto(s)
Proteínas Quinasas Activadas por AMP , Aminoimidazol Carboxamida , Cardiotónicos , Doxorrubicina , Insuficiencia Cardíaca , Ribonucleótidos , Animales , Doxorrubicina/efectos adversos , Aminoimidazol Carboxamida/análogos & derivados , Aminoimidazol Carboxamida/farmacología , Insuficiencia Cardíaca/inducido químicamente , Insuficiencia Cardíaca/prevención & control , Insuficiencia Cardíaca/metabolismo , Insuficiencia Cardíaca/patología , Insuficiencia Cardíaca/tratamiento farmacológico , Ribonucleótidos/farmacología , Masculino , Cardiotónicos/farmacología , Ratas , Proteínas Quinasas Activadas por AMP/metabolismo , Mitocondrias Cardíacas/metabolismo , Mitocondrias Cardíacas/efectos de los fármacos , Miocardio/metabolismo , Miocardio/patología , Ácidos Grasos/metabolismo , Modelos Animales de Enfermedad
3.
Ann Surg Oncol ; 31(5): 3120-3127, 2024 May.
Artículo en Inglés | MEDLINE | ID: mdl-38261128

RESUMEN

BACKGROUND: High-risk lesions (HRL) of the breast are risk factors for future breast cancer development and may be associated with a concurrent underlying malignancy when identified on needle biopsy; however, there are few data evaluating HRLs in carriers of germline pathogenic variants (PVs) in breast cancer predisposition genes. METHODS: We identified patients from two institutions with germline PVs in high- and moderate-penetrance breast cancer predisposition genes and an HRL in an intact breast, including atypical ductal hyperplasia (ADH), flat epithelial atypia (FEA), and lobular neoplasia (LN). We calculated upgrade rates at surgical excision and used Kaplan-Meier methods to characterize 3-year breast cancer risk in patients without upgrade. RESULTS: Of 117 lesions in 105 patients, 65 (55.6%) were ADH, 48 (41.0%) were LN, and 4 (3.4%) were FEA. Most PVs (83.8%) were in the BRCA1/2, CHEK2 and ATM genes. ADH and FEA were excised in most cases (87.1%), with upgrade rates of 11.8% (95% confidence interval [CI] 5.5-23.4%) and 0%, respectively. LN was selectively excised (53.8%); upgrade rate in the excision group was 4.8% (95% CI 0.8-22.7%), and with 20 months of median follow-up, no same-site cancers developed in the observation group. Among those not upgraded, the 3-year risk of breast cancer development was 13.1% (95% CI 6.3-26.3%), mostly estrogen receptor-positive (ER +) disease (89.5%). CONCLUSIONS: Upgrade rates for HRLs in patients with PVs in breast cancer predisposition genes appear similar to non-carriers. HRLs may be associated with increased short-term ER+ breast cancer risk in PV carriers, warranting strong consideration of surgical or chemoprevention therapies in this population.


Asunto(s)
Neoplasias de la Mama , Carcinoma in Situ , Carcinoma Intraductal no Infiltrante , Lesiones Precancerosas , Humanos , Femenino , Neoplasias de la Mama/cirugía , Proteína BRCA1/genética , Proteína BRCA2/genética , Mama/patología , Carcinoma Intraductal no Infiltrante/genética , Carcinoma Intraductal no Infiltrante/cirugía , Carcinoma Intraductal no Infiltrante/patología , Carcinoma in Situ/patología , Lesiones Precancerosas/patología , Células Germinativas/patología , Biopsia con Aguja Gruesa , Estudios Retrospectivos
4.
Plant Mol Biol ; 110(4-5): 305-324, 2022 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-35610527

RESUMEN

Photosynthesis is the vital metabolism of the plant affected by abiotic stress such as high temperature and elevated [CO2] levels, which ultimately affect the source-sink relationship. Triose phosphate, the primary precursor of carbohydrate (starch and sucrose) synthesis in the plant, depends on environmental cues. The synthesis of starch in the chloroplasts of leaves (during the day), the transport of photoassimilates (sucrose) from source to sink, the loading and unloading of photoassimilates, and the accumulation of starch in the sink tissue all require a highly regulated network and communication system within the plant. These processes might be affected by high-temperature stress and elevated [CO2] conditions. Generally, elevated [CO2] levels enhance plant growth, photosynthetic rate, starch synthesis, and accumulation, ultimately diluting the nutrient of sink tissues. On the contrary, high-temperature stress is detrimental to plant development affecting photosynthesis, starch synthesis, sucrose synthesis and transport, and photoassimilate accumulation in sink tissues. Moreover, these environmental conditions also negatively impact the quality attributes such as grain/tuber quality, cooking quality, nutritional status in the edible parts and organoleptic traits. In this review, we have attempted to provide an insight into the source-sink relationship and the sugar metabolites synthesized and utilized by the plant under elevated [CO2] and high-temperature stress. This review will help future researchers comprehend the source-sink process for crop growth under changing climate scenarios.


Asunto(s)
Dióxido de Carbono , Fotosíntesis , Dióxido de Carbono/metabolismo , Temperatura , Hojas de la Planta/metabolismo , Sacarosa/metabolismo , Almidón/metabolismo , Carbohidratos
5.
Cancer Cell Int ; 22(1): 305, 2022 Oct 07.
Artículo en Inglés | MEDLINE | ID: mdl-36207736

RESUMEN

Plants-based natural compounds are well-identified and recognized chemoprotective agents that can be used for primary and secondary cancer prevention, as they have proven efficacy and fewer side effects. In today's scenario, when cancer cases rapidly increase in developed and developing countries, the anti-cancerous plant-based compounds become highly imperative. Among others, the Asteraceae (Compositae) family's plants are rich in sesquiterpenoid lactones, a subclass of terpenoids with wide structural diversity, and offer unique anti-cancerous effects. These plants are utilized in folk medicine against numerous diseases worldwide. However, these plants are now a part of the modern medical system, with their sesquiterpenoid lactones researched extensively to find more effective and efficient cancer drug regimens. Given the evolving importance of sesquiterpenoid lactones for cancer research, this review comprehensively covers different domains in a spectrum of sesquiterpenoid lactones viz (i) Guaianolides (ii) Pseudoguaianolide (iii) Eudesmanolide (iv) Melampodinin A and (v) Germacrene, from important plants such as Cynara scolymus (globe artichoke), Arnica montana (wolf weeds), Spilanthes acmella, Taraxacum officinale, Melampodium, Solidago spp. The review, therefore, envisages being a helpful resource for the growth of plant-based anti-cancerous drug development.

6.
Cancer Cell Int ; 22(1): 206, 2022 Jun 02.
Artículo en Inglés | MEDLINE | ID: mdl-35655306

RESUMEN

Cancer, one of the leading illnesses, accounts for about 10 million deaths worldwide. The treatment of cancer includes surgery, chemotherapy, radiation therapy, and drug therapy, along with others, which not only put a tremendous economic effect on patients but also develop drug resistance in patients with time. A significant number of cancer cases can be prevented/treated by implementing evidence-based preventive strategies. Plant-based drugs have evolved as promising preventive chemo options both in developing and developed nations. The secondary plant metabolites such as alkaloids have proven efficacy and acceptability for cancer treatment. Apropos, this review deals with a spectrum of promising alkaloids such as colchicine, vinblastine, vincristine, vindesine, vinorelbine, and vincamine within different domains of comprehensive information on these molecules such as their medical applications (contemporary/traditional), mechanism of antitumor action, and potential scale-up biotechnological studies on an in-vitro scale. The comprehensive information provided in the review will be a valuable resource to develop an effective, affordable, and cost effective cancer management program using these alkaloids.

7.
Int J Mol Sci ; 23(19)2022 Sep 25.
Artículo en Inglés | MEDLINE | ID: mdl-36232603

RESUMEN

The interaction between selective nutrients and linked genes involving a specific organ reveals the genetic make-up of an individual in response to a particular nutrient. The interaction of genes with food opens opportunities for the addition of bioactive compounds for specific populations comprising identical genotypes. The slight difference in the genetic blueprints of humans is advantageous in determining the effect of nutrients and their metabolism in the body. The basic knowledge of emerging nutrigenomics and nutrigenetics can be applied to optimize health, prevention, and treatment of diseases. In addition, nutrient-mediated pathways detecting the cellular concentration of nutrients such as sugars, amino acids, lipids, and metabolites are integrated and coordinated at the organismal level via hormone signals. This review deals with the interaction of nutrients with various aspects of nutrigenetics and nutrigenomics along with pathways involved in nutrient sensing and regulation, which can provide a detailed understanding of this new leading edge in nutrition research and its potential application to dietetic practice.


Asunto(s)
Dieta , Nutrigenómica , Amino Azúcares , Hormonas , Humanos , Lípidos , Nutrientes , Percepción
8.
Mol Biol Rep ; 48(1): 927-939, 2021 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-33389540

RESUMEN

In spite of much awareness, diabetes mellitus continues to remain one of major reasons for mortality and morbidity rate all over the globe. Free radicals cause oxidative stress which is responsible for causing diabetes. The recent advancements in elucidation of ARE/keap1/Nrf2 pathway can help in better understanding of diabetes mellitus. Various clinical trials and animal studies have shown the promising effect of Nrf2 pathway in reversing diabetes by counteracting with the oxidative stress produced. The gene is known to dissociate from Keap1 on coming in contact with such stresses to show preventive and prognosis effect. The Nrf2 gene has been marked as a molecular player in dealing with wide intracellular as well as extracellular cellular interactions in different diseases. The regulation of this gene gives some transcription factor that contain antioxidant response elements (ARE) in their promoter region and thus are responsible for encoding certain proteins involved in regulation of metabolic and detoxifying enzymes.


Asunto(s)
Elementos de Respuesta Antioxidante , Diabetes Mellitus Tipo 2/genética , Nefropatías Diabéticas/genética , Hipoglucemiantes/uso terapéutico , Proteína 1 Asociada A ECH Tipo Kelch/genética , Factor 2 Relacionado con NF-E2/genética , Animales , Antioxidantes/uso terapéutico , Ensayos Clínicos como Asunto , Curcumina/análogos & derivados , Curcumina/uso terapéutico , Diabetes Mellitus Experimental/tratamiento farmacológico , Diabetes Mellitus Experimental/genética , Diabetes Mellitus Experimental/metabolismo , Diabetes Mellitus Experimental/patología , Diabetes Mellitus Tipo 2/tratamiento farmacológico , Diabetes Mellitus Tipo 2/metabolismo , Diabetes Mellitus Tipo 2/patología , Nefropatías Diabéticas/tratamiento farmacológico , Nefropatías Diabéticas/metabolismo , Nefropatías Diabéticas/patología , Regulación de la Expresión Génica , Humanos , Proteína 1 Asociada A ECH Tipo Kelch/metabolismo , Factor 2 Relacionado con NF-E2/metabolismo , Estrés Oxidativo/efectos de los fármacos , Unión Proteica , Especies Reactivas de Oxígeno/antagonistas & inhibidores , Especies Reactivas de Oxígeno/metabolismo , Transducción de Señal
9.
Mol Biol Rep ; 48(2): 1869-1881, 2021 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-33479829

RESUMEN

Diabetes mellitus (DM) has become one of the major healthcare challenges worldwide in the recent times and inflammation being one of its key pathogenic process/mechanism affect several body parts including the peripheral and central nervous system. High-mobility group box 1 (HMGB1) is one of the major non-histone proteins that plays a key role in triggering the inflammatory response. Upon its release into the extracellular milieu, HMGB1 acts as an "alarmin" for the immune system to initiate tissue repair as a component of the host defense system. Furthermore, HMGB1 along with its downstream receptors like Toll-like receptors (TLRs) and receptors for advanced glycation end products (RAGE) serve as the suitable target for DM. The forthcoming research in the field of diabetes would potentially focus on the development of alternative approaches to target the centre of inflammation that is primarily mediated by HMGB1 to improve diabetic-related complications. This review covers the therapeutic actions of HMGB1 protein, which acts by activating the RAGE and TLR molecules to constitute a functional tripod system, in turn activating NF-κB pathway that contributes to the production of mediators for pro-inflammatory cytokines associated with DM. The interaction between TLR2 and TLR4 with ligands present in the host and the activation of RAGE stimulates various immune and metabolic responses that contribute to diabetes. This review emphasizes to elucidate the role of HMGB1 in the initiation and progression of DM and control over the inflammatory tripod as a promising therapeutic approach in the management of DM.


Asunto(s)
Diabetes Mellitus/inmunología , Diabetes Mellitus/metabolismo , Proteína HMGB1/metabolismo , Receptor para Productos Finales de Glicación Avanzada/metabolismo , Receptores Toll-Like/metabolismo , Animales , Citocinas/metabolismo , Diabetes Mellitus/tratamiento farmacológico , Regulación de la Expresión Génica/efectos de los fármacos , Regulación de la Expresión Génica/genética , Proteína HMGB1/antagonistas & inhibidores , Proteína HMGB1/genética , Proteína HMGB1/inmunología , Humanos , Inflamación/tratamiento farmacológico , Inflamación/inmunología , Inflamación/metabolismo , Inflamación/patología , FN-kappa B/metabolismo , Receptor para Productos Finales de Glicación Avanzada/genética , Transducción de Señal/efectos de los fármacos , Transducción de Señal/genética , Receptores Toll-Like/inmunología
10.
Blood ; 132(12): 1225-1240, 2018 09 20.
Artículo en Inglés | MEDLINE | ID: mdl-29930011

RESUMEN

SF3B1, SRSF2, and U2AF1 are the most frequently mutated splicing factor genes in the myelodysplastic syndromes (MDS). We have performed a comprehensive and systematic analysis to determine the effect of these commonly mutated splicing factors on pre-mRNA splicing in the bone marrow stem/progenitor cells and in the erythroid and myeloid precursors in splicing factor mutant MDS. Using RNA-seq, we determined the aberrantly spliced genes and dysregulated pathways in CD34+ cells of 84 patients with MDS. Splicing factor mutations result in different alterations in splicing and largely affect different genes, but these converge in common dysregulated pathways and cellular processes, focused on RNA splicing, protein synthesis, and mitochondrial dysfunction, suggesting common mechanisms of action in MDS. Many of these dysregulated pathways and cellular processes can be linked to the known disease pathophysiology associated with splicing factor mutations in MDS, whereas several others have not been previously associated with MDS, such as sirtuin signaling. We identified aberrantly spliced events associated with clinical variables, and isoforms that independently predict survival in MDS and implicate dysregulation of focal adhesion and extracellular exosomes as drivers of poor survival. Aberrantly spliced genes and dysregulated pathways were identified in the MDS-affected lineages in splicing factor mutant MDS. Functional studies demonstrated that knockdown of the mitosis regulators SEPT2 and AKAP8, aberrantly spliced target genes of SF3B1 and SRSF2 mutations, respectively, led to impaired erythroid cell growth and differentiation. This study illuminates the effect of the common spliceosome mutations on the MDS phenotype and provides novel insights into disease pathophysiology.


Asunto(s)
Mutación , Síndromes Mielodisplásicos/genética , Factores de Empalme de ARN/genética , Empalme del ARN , Empalmosomas/genética , Estudios de Cohortes , Reparación del ADN , Regulación de la Expresión Génica , Humanos , Síndromes Mielodisplásicos/epidemiología , Fosfoproteínas/genética , Factores de Empalme Serina-Arginina/genética , Factor de Empalme U2AF/genética , Análisis de Supervivencia
11.
BMC Genomics ; 18(1): 53, 2017 01 07.
Artículo en Inglés | MEDLINE | ID: mdl-28061811

RESUMEN

BACKGROUND: Single-cell RNA-Seq can be a valuable and unbiased tool to dissect cellular heterogeneity, despite the transcriptome's limitations in describing higher functional phenotypes and protein events. Perhaps the most important shortfall with transcriptomic 'snapshots' of cell populations is that they risk being descriptive, only cataloging heterogeneity at one point in time, and without microenvironmental context. Studying the genetic ('nature') and environmental ('nurture') modifiers of heterogeneity, and how cell population dynamics unfold over time in response to these modifiers is key when studying highly plastic cells such as macrophages. RESULTS: We introduce the programmable Polaris™ microfluidic lab-on-chip for single-cell sequencing, which performs live-cell imaging while controlling for the culture microenvironment of each cell. Using gene-edited macrophages we demonstrate how previously unappreciated knockout effects of SAMHD1, such as an altered oxidative stress response, have a large paracrine signaling component. Furthermore, we demonstrate single-cell pathway enrichments for cell cycle arrest and APOBEC3G degradation, both associated with the oxidative stress response and altered proteostasis. Interestingly, SAMHD1 and APOBEC3G are both HIV-1 inhibitors ('restriction factors'), with no known co-regulation. CONCLUSION: As single-cell methods continue to mature, so will the ability to move beyond simple 'snapshots' of cell populations towards studying the determinants of population dynamics. By combining single-cell culture, live-cell imaging, and single-cell sequencing, we have demonstrated the ability to study cell phenotypes and microenvironmental influences. It's these microenvironmental components - ignored by standard single-cell workflows - that likely determine how macrophages, for example, react to inflammation and form treatment resistant HIV reservoirs.


Asunto(s)
Interacción Gen-Ambiente , Macrófagos/citología , Análisis de Secuencia de ARN , Análisis de la Célula Individual , Técnicas de Inactivación de Genes , Humanos , Macrófagos/metabolismo , Fenotipo , Proteína 1 que Contiene Dominios SAM y HD/deficiencia , Proteína 1 que Contiene Dominios SAM y HD/genética
12.
J Chem Inf Model ; 56(5): 843-53, 2016 05 23.
Artículo en Inglés | MEDLINE | ID: mdl-26958865

RESUMEN

The biosynthesis of NAD constitutes an important metabolic module in the cell, since NAD is an essential cofactor involved in several metabolic reactions. NAD concentrations are known to be significantly increased in several cancers, particularly in glioma, consistent with the observation of up-regulation of several enzymes of the network. Modulating NAD biosynthesis in glioma is therefore an attractive therapeutic strategy. Here we report reconstruction of a biochemical network of NAD biosynthesis consisting of 22 proteins, 36 metabolites, and 86 parameters, tuned to mimic the conditions in glioma. Kinetic simulations of the network provide comprehensive insights about the role of individual enzymes. Further, quantitative changes in the same network between different states of health and disease enable identification of drug targets, based on specific alterations in the given disease. Through simulations of enzyme inhibition titrations, we identify NMPRTase as a potential drug target, while eliminating other possible candidates NMNAT, NAPRTase, and NRK. We have also simulated titrations of both binding affinities as well as inhibitor concentrations, which provide insights into the druggability limits of the target, a novel aspect that can provide useful guidelines for designing inhibitors with optimal affinities. Our simulations suggest that an inhibitor affinity of 10 nM used in a concentration range of 0.1 to 10 µM achieves a near maximal inhibition response for NMPRTase and that increasing the affinity any further is not likely to have a significant advantage. Thus, the quantitative appreciation defines a maximal extent of inhibition possible for a chosen enzyme in the context of its network. Knowledge of this type enables an upper affinity threshold to be defined as a goal in lead screening and refinement stages in drug discovery.


Asunto(s)
Descubrimiento de Drogas/métodos , Enzimas/metabolismo , Glioma/tratamiento farmacológico , Glioma/enzimología , Modelos Biológicos , Terapia Molecular Dirigida , NAD/biosíntesis , Línea Celular Tumoral , Glioma/metabolismo , Humanos , Cinética
13.
J Food Sci Technol ; 53(11): 4023-4032, 2016 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-28035158

RESUMEN

Comparative investigation of major phytoconstituents was performed from various parts of tea plant viz. apical bud, subtending 1st-5th leaf, stem, coarse leaves, flowers, fruits and roots. From the results of comparative RP-HPLC-DAD analysis it was found that underutilized tea parts especially coarse leaves, flowers and fruits contains abundant amount of phenolics (17.5%) and catechins (4-5%). From these underutilized tea plant parts the catechins were extracted and purified and then screened for their anticancer, immunomodulatory effect and antimicrobial activity against food borne pathogens. The results showed that tea fruit extract exhibited higher toxicity against oral cancer cells and also promotes proliferation of mice splenocytes. The results of antimicrobial studies revealed the inhibitory effect of these extracts against both gram positive and gram negative bacteria. These investigations clearly demonstrated that the underutilized tea plant parts could act as economical and sustainable bioresource of functionally active constituents which further lead to the development of new cost-effective nutraceuticals and other formulations.

14.
Nucleic Acids Res ; 41(5): 3274-88, 2013 Mar 01.
Artículo en Inglés | MEDLINE | ID: mdl-23355610

RESUMEN

Helicobacter pylori is a Gram-negative bacterium that colonizes human stomach and causes gastric inflammation. The species is naturally competent and displays remarkable diversity. The presence of a large number of restriction-modification (R-M) systems in this bacterium creates a barrier against natural transformation by foreign DNA. Yet, mechanisms that protect incoming double-stranded DNA (dsDNA) from restriction enzymes are not well understood. A DNA-binding protein, DNA Processing Protein A (DprA) has been shown to facilitate natural transformation of several Gram-positive and Gram-negative bacteria by protecting incoming single-stranded DNA (ssDNA) and promoting RecA loading on it. However, in this study, we report that H. pylori DprA (HpDprA) binds not only ssDNA but also dsDNA thereby conferring protection to both from various exonucleases and Type II restriction enzymes. Here, we observed a stimulatory role of HpDprA in DNA methylation through physical interaction with methyltransferases. Thus, HpDprA displayed dual functional interaction with H. pylori R-M systems by not only inhibiting the restriction enzymes but also stimulating methyltransferases. These results indicate that HpDprA could be one of the factors that modulate the R-M barrier during inter-strain natural transformation in H. pylori.


Asunto(s)
Proteínas Bacterianas/fisiología , Competencia de la Transformación por ADN , Helicobacter pylori/genética , Proteínas de la Membrana/fisiología , Proteínas Bacterianas/química , Huella de ADN , ADN de Cadena Simple/química , Desoxirribonucleasas de Localización Especificada Tipo II/química , Ensayo de Cambio de Movilidad Electroforética , Proteínas de la Membrana/química , Metiltransferasas/química , Oligodesoxirribonucleótidos/química , Unión Proteica , Transformación Bacteriana
15.
BMC Genomics ; 15: 400, 2014 May 26.
Artículo en Inglés | MEDLINE | ID: mdl-24886435

RESUMEN

BACKGROUND: Sexually dimorphic phenotypes are generally associated with differential gene expression between the sexes. The study of molecular evolution and genomic location of these differentially expressed, or sex-biased, genes is important for understanding inter-sexual divergence under sex-specific selection pressures. Teleost fish provide a unique opportunity to examine this divergence in the presence of variable sex-determination mechanisms of recent origin. The guppy, Poecilia reticulata, displays sexual dimorphism in size, ornaments, and behavior, traits shaped by natural and sexual selection in the wild. RESULTS: To gain insight into molecular mechanisms underlying the guppy's sexual dimorphism, we assembled a reference transcriptome combining genome-independent as well as genome-guided assemblies and analyzed sex-biased gene expression between different tissues of adult male and female guppies. We found tissue-associated sex-biased expression of genes related to pigmentation, signal transduction, and spermatogenesis in males; and growth, cell-division, extra-cellular matrix organization, nutrient transport, and folliculogenesis in females. While most sex-biased genes were randomly distributed across linkage groups, we observed accumulation of ovary-biased genes on the sex linkage group, LG12. Both testis-biased and ovary-biased genes showed a significantly higher rate of non-synonymous to synonymous substitutions (dN/dS) compared to unbiased genes. However, in somatic tissues only female-biased genes, including those co-expressed in multiple tissues, showed elevated ratios of non-synonymous substitutions. CONCLUSIONS: Our work identifies a set of annotated gene products that are candidate factors affecting sexual dimorphism in guppies. The differential genomic distribution of gonad-biased genes provides evidence for sex-specific selection pressures acting on the nascent sex chromosomes of the guppy. The elevated rates of evolution of testis-biased and female-biased genes indicate differing evolution under distinct selection pressures on the reproductive versus non-reproductive tissues.


Asunto(s)
Genómica/métodos , Poecilia/genética , Caracteres Sexuales , Animales , Femenino , Perfilación de la Expresión Génica , Regulación de la Expresión Génica , Masculino , Tasa de Mutación , Especificidad de Órganos , Poecilia/clasificación , Poecilia/fisiología , Selección Genética , Cromosomas Sexuales , Transcriptoma
16.
Drug Metab Pers Ther ; 39(3): 145-158, 2024 Sep 01.
Artículo en Inglés | MEDLINE | ID: mdl-39352764

RESUMEN

OBJECTIVES: Withania somnifera (WS) is a valuable medicinal plant that has been used against several ailments. The medicinal properties of WS are ascribed to existence of secondary metabolites which are in great demand in herbal nutraceutical industry. Despite well-known therapeutic effects of WS, it is necessary to assess preclinical toxicity of WS plant on rats and further explore its potential application against treatment of various disorders in humans. The existing study assessed oral acute and sub-chronic toxicities of WS root extract in Sprague Dawley (SD) rats (male and female) for 14 and 90 days, respectively under OECD-423 and -408 guidelines as well as GLP compliance. METHODS: In acute toxicity, rats of either sex were orally fed a dose of 2,000 mg/kg. In sub-chronic toxicity, animals were orally administered repeated doses of WS root extract at 250, 500, 1,000 mg/kg for 90 days with an additional 14-day recovery period. Two more groups (n=5 animals each) receiving vehicle and 1,000 mg/kg of WS root extract for 90 days were also observed. RESULTS: In acute toxicity, the results revealed that LD50 of WS root extract in SD rats was higher than 2,000 mg/kg. In sub-chronic toxicity, oral administration of extract for 90 days showed no significant toxicological changes in rats. Haematological and serum chemistry markers were found within normal range. Terminal necropsy showed no gross or histopathological outcomes. CONCLUSIONS: The no-observed-adverse-effect level (NOAEL) of WS root extract was 1,000 mg/kg body weight, and safe to use at this dose in rats.


Asunto(s)
Extractos Vegetales , Raíces de Plantas , Ratas Sprague-Dawley , Withania , Animales , Withania/química , Extractos Vegetales/administración & dosificación , Extractos Vegetales/toxicidad , Masculino , Ratas , Raíces de Plantas/química , Femenino , Administración Oral , Pruebas de Toxicidad Aguda , Pruebas de Toxicidad Subcrónica , Relación Dosis-Respuesta a Droga , Dosificación Letal Mediana
17.
Drug Metab Pers Ther ; 2024 Oct 02.
Artículo en Inglés | MEDLINE | ID: mdl-39348521

RESUMEN

OBJECTIVES: Withania somnifera (WS) is a valuable medicinal plant that has been used against several ailments. The medicinal properties of WS are ascribed to existence of secondary metabolites which are in great demand in herbal nutraceutical industry. Despite well-known therapeutic effects of WS, it is necessary to assess preclinical toxicity of WS plant on rats and further explore its potential application against treatment of various disorders in humans. The existing study assessed oral acute and sub-chronic toxicities of WS root extract in Sprague Dawley (SD) rats (male and female) for 14 and 90 days, respectively under OECD-423 and -408 guidelines as well as GLP compliance. METHODS: In acute toxicity, rats of either sex were orally fed a dose of 2,000 mg/kg. In sub-chronic toxicity, animals were orally administered repeated doses of WS root extract at 250, 500, 1,000 mg/kg for 90 days with an additional 14-day recovery period. Two more groups (n=5 animals each) receiving vehicle and 1,000 mg/kg of WS root extract for 90 days were also observed. RESULTS: In acute toxicity, the results revealed that LD50 of WS root extract in SD rats was higher than 2,000 mg/kg. In sub-chronic toxicity, oral administration of extract for 90 days showed no significant toxicological changes in rats. Haematological and serum chemistry markers were found within normal range. Terminal necropsy showed no gross or histopathological outcomes. CONCLUSIONS: The no-observed-adverse-effect level (NOAEL) of WS root extract was 1,000 mg/kg body weight, and safe to use at this dose in rats.

18.
Food Res Int ; 191: 114715, 2024 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-39059963

RESUMEN

The positive health benefits of colored staples have led to a significant increase in interest in them as healthy food ingredients. Numerous in vitro and in vivo studies have demonstrated that colored cereals are rich in antioxidants, carotenoids, and xanthophylls, which are widely used as natural additives in the food industry. Additionally, shifts in consumer preferences have led to a preference for nutritionally balanced diets over traditional high-energy ones. Thus, colored cereals offer additional nutritional value that has been previously untapped. Besides providing essential nutrients, these natural pigments also have the potential to replace synthetic colors and food additives. This review aims to provide insights into the nutritional value of various colored staples compared to conventional starchy staples and their associated health benefits. Colored staples can be incorporated into daily diets, offering a nutritious and healthful addition to the table.


Asunto(s)
Antioxidantes , Grano Comestible , Valor Nutritivo , Humanos , Grano Comestible/química , Antioxidantes/análisis , Carotenoides/análisis , Xantófilas , Color , Dieta Saludable
19.
Heliyon ; 10(17): e36963, 2024 Sep 15.
Artículo en Inglés | MEDLINE | ID: mdl-39281488

RESUMEN

The worldwide consumption, health-promoting and nutritional properties of mushrooms have been extensively researched over a decade. Although, wide range of edible mushrooms is still unexplored, which can be a valuable source of bioactive compounds in dietary supplements and biopharma industry. Mushrooms represent as dynamic source of nutrients lacking in food from plant or animal origin thus, considered as vital functional food utilized for prevention of numerous diseases. The unique bioactive compounds in mushroom and their anti-inflammatory, anti-tumour and other health attributes have been discussed. The preventive action of mushroom on maintaining the gut health and their property to act as pro, pre or symbiotic is also elucidated. The direct prebiotic activity of mushroom affects gut haemostasis and enhances the gut microbiota. Recent reports on role in improving the brain health and neurological impact by mushroom are mentioned. The role of bioactive components in mushroom with relation to nutrigenomics have been explored. The nutrigenomics has become a crucial tool to assess individuals' diet according its genetic make-up and thus, cure of several diseases. Undeniably, mushroom in present time is regarded as next-generation wonder food, playing crucial role in sustaining health, thus, an active ingredient of food and nutraceutical industries.

20.
Curr Nutr Rep ; 13(2): 166-185, 2024 06.
Artículo en Inglés | MEDLINE | ID: mdl-38498287

RESUMEN

PURPOSE OF REVIEW: This review delves into the complex interplay between obesity-induced gut microbiota dysbiosis and the progression of type 2 diabetes mellitus (T2DM), highlighting the potential of natural products in mitigating these effects. By integrating recent epidemiological data, we aim to provide a nuanced understanding of how obesity exacerbates T2DM through gut flora alterations. RECENT FINDINGS: Advances in research have underscored the significance of bioactive ingredients in natural foods, capable of restoring gut microbiota balance, thus offering a promising approach to manage diabetes in the context of obesity. These findings build upon the traditional use of medicinal plants in diabetes treatment, suggesting a deeper exploration of their mechanisms of action. This comprehensive manuscript underscores the critical role of targeting gut microbiota dysbiosis in obesity-related T2DM management and by bridging traditional knowledge with current scientific evidence; we highlighted the need for continued research into natural products as a complementary strategy for comprehensive diabetes care.


Asunto(s)
Productos Biológicos , Diabetes Mellitus Tipo 2 , Disbiosis , Microbioma Gastrointestinal , Obesidad , Humanos , Microbioma Gastrointestinal/efectos de los fármacos , Diabetes Mellitus Tipo 2/tratamiento farmacológico , Productos Biológicos/farmacología , Productos Biológicos/uso terapéutico , Obesidad/tratamiento farmacológico
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