Association between the relative abundance of phyla actinobacteria, vitamin C consumption, and DNA methylation of genes linked to immune response pathways.

Introduction: There is an emerging body of evidence that vitamin C consumption can modulate microbiota abundance and can also impact DNA methylation in the host, and this could be a link between diet, microbiota, and immune response. The objective of this study was to evaluate common CpG sites associated with both vitamin C and microbiota phyla abundance. Methods: Six healthy women participated in this cohort study. They were divided into two groups, according to the amount of vitamin C they ingested. Ingestion was evaluated using the 24-h recall method. The Illumina 450 k BeadChip was used to evaluate DNA methylation. Singular value decomposition analyses were used to evaluate the principal components of this dataset. Associations were evaluated using the differentially methylated position function from the Champ package for R Studio. Results and discussion: The group with higher vitamin C (HVC) ingestion also had a higher relative abundance of Actinobacteria. There was a positive correlation between those variables (r = 0.84, p = 0.01). The HVC group also had higher granulocytes, and regarding DNA methylation, there were 207 CpG sites commonly related to vitamin C ingestion and the relative abundance of Actinobacteria. From these sites, there were 13 sites hypomethylated and 103 hypermethylated. The hypomethylated targets involved the respective processes: immune function, glucose homeostasis, and general cellular metabolism. The hypermethylated sites were also enriched in immune function-related processes, and interestingly, more immune responses against pathogens were detected. These findings contribute to understanding the interaction between nutrients, microbiota, DNA methylation, and the immune response.

Efficacy of the argon plasma coagulation in patients with weight regain after gastric bypass: a randomized control trial.

Background and study aims Endoscopic procedure using argon plasma coagulation (APC) promotes a progressive reduction in gastrojejunal anastomosis diameter. The present study aimed to evaluate the efficacy of the APC in patients with weight regain in the postoperative periods of gastric bypass. Patients and methods This was a randomized controlled trial conducted with 66 patients who were randomly assigned selected (using lottery method) and divided into two groups: study group (SG), 38 patients (APC treatment); and control group (CG), 28 patients (only endoscopy procedure). We considered 30 days,180 days, and one year as short-term, medium-term, and long-term, respectively. The parameters analyzed were total weight loss (TWL), excess weight loss (%EWL), total weight loss (%TWL), and reduction of weight regain (%RWR). Furthermore, a biopsy for neoplastic histological changes was carried out for the APC group. For statistical analysis, values of P  < 0.05 were considered significant. Results The %TWL and %RWR were higher in the SG in short, medium, and long terms, when compared to the same periods in the CG ( P  < 0.001). One year after follow-up, the final weight did not reach the statistical difference between groups. Biopsy performed in SG 1 year after APC did not reveal neoplastic histological changes. Conclusions APC effectively treats weight regain after bariatric surgery in the short and medium-term. An important "new" weight gain was observed in the long-term, showing that obesity is a chronic disease that requires multidisciplinary and family care for life. Also, APC is a safe procedure with low adverse event rates.

GENES EXPRESSION AND SERUM BIOMARKERS FOR DIAGNOSIS OF HEPATOCELLULAR CARCINOMA, CIRRHOSIS AND HEPATITIS C.

BACKGROUND: Hepatocellular carcinoma (HCC) is the most common type of liver cancer. Risk factors for HCC include hepatitis C (HCV) and B (HBV) virus infection, alcoholic cirrhosis and genetic alterations that can affect several cellular pathways. OBJECTIVE: This study purposed to analyze the gene and serum protein expression of vascular endothelial growth factor (VEGF), angiogenesis, alpha fetoprotein, cystatin B (CSTB), ß-catenin and glypican-3 (GPC3) in groups with HCC, cirrhosis or HCV and controls, and their relation with clinical staging in the HCC and cirrhosis groups, as well its sensitivity and specificity values. METHODS: A total of 230 individuals were distributed in Group 1 (G1) - 80 patients with HCC; Group 2 (G2) - 76 patients with cirrhosis due to any etiology; Group 3 (G3) - 33 patients with HCV; Group 4 (G4 - controls) - 41 individuals without clinical or biochemical signs of any liver disease. Gene expression was analyzed by qRT-PCR and serum proteins were performed using the ELISA method. RESULTS: Increased VEGF and angiogenesis, alpha fetoprotein expression could be observed in BCLC stage-D patients compared to stage-B patients, and stage-C patients showed higher expression of ß-catenin, compared to stage-B patients (P<0.05). For VEGF and GPC3, discriminatory power was observed between HCC patients and controls (AUC =0.71; 0.82, respectively). CSTB showed discriminatory power in the comparison between patients with HCV and controls (AUC =0.74). CONCLUSION: The present study confirms the sensitivity of serum CSTB in the diagnosis of hepatitis C, and gene expression of VEGF and serum GPC3, confer both sensitivity and specificity for the diagnosis of HCC.

Expressão gênica e biomarcadores séricos para diagnóstico de carcinoma hepatocelular, cirrose e hepatite C / Genes expression and serum biomarkers for diagnosis of hepatocellular carcinoma, cirrhosis and hepatitis c

ABSTRACT Background: Hepatocellular carcinoma (HCC) is the most common type of liver cancer. Risk factors for HCC include hepatitis C (HCV) and B (HBV) virus infection, alcoholic cirrhosis and genetic alterations that can affect several cellular pathways. Objective: This study purposed to analyze the gene and serum protein expression of vascular endothelial growth factor (VEGF), angiogenesis, alpha fetoprotein, cystatin B (CSTB), β-catenin and glypican-3 (GPC3) in groups with HCC, cirrhosis or HCV and controls, and their relation with clinical staging in the HCC and cirrhosis groups, as well its sensitivity and specificity values. Methods: A total of 230 individuals were distributed in Group 1 (G1) - 80 patients with HCC; Group 2 (G2) - 76 patients with cirrhosis due to any etiology; Group 3 (G3) - 33 patients with HCV; Group 4 (G4 - controls) - 41 individuals without clinical or biochemical signs of any liver disease. Gene expression was analyzed by qRT-PCR and serum proteins were performed using the ELISA method. Results: Increased VEGF and angiogenesis, alpha fetoprotein expression could be observed in BCLC stage-D patients compared to stage-B patients, and stage-C patients showed higher expression of β-catenin, compared to stage-B patients (P<0.05). For VEGF and GPC3, discriminatory power was observed between HCC patients and controls (AUC =0.71; 0.82, respectively). CSTB showed discriminatory power in the comparison between patients with HCV and controls (AUC =0.74). Conclusion The present study confirms the sensitivity of serum CSTB in the diagnosis of hepatitis C, and gene expression of VEGF and serum GPC3, confer both sensitivity and specificity for the diagnosis of HCC.

RESUMO Contexto: Carcinoma hepatocelular (CHC) é o tipo mais comum de câncer de fígado. Os fatores de risco para CHC incluem infecção pelo vírus da hepatite C (VHC) e B (VHB), cirrose alcoólica e alterações genéticas que podem afetar diversas vias celulares. Objetivo: Este estudo teve como objetivo analisar a expressão gênica e proteica sérica de VEGF, AFP, CSTB, β-catenina e GPC3 em grupos com CHC, cirrose ou VHC e controles, e sua relação com o estadiamento clínico nos grupos CHC e cirrose, bem como sua valores de sensibilidade e especificidade. Métodos: Duzentos e trinta indivíduos foram distribuídos no Grupo 1 (G1) - 80 pacientes com CHC; Grupo 2 (G2) - 76 pacientes com cirrose de qualquer etiologia; Grupo 3 (G3) - 33 pacientes com VHC; Grupo 4 (G4 - Controles) - 41 indivíduos sem sinais clínicos ou bioquímicos de qualquer doença hepática. A expressão gênica foi analisada por qRT-PCR e as proteínas séricas foram realizadas pelo método ELISA. Resultados: Aumento da expressão de VEGF e AFP pode ser observado em pacientes BCLC estágio D em comparação com pacientes estágio B, e pacientes estágio C apresentaram maior expressão de CTNNB1, em comparação com pacientes estágio B (P<0,05). Para VEGF e GPC3, foi observado poder discriminatório entre pacientes com CHC e controles (AUC = 0,71; 0,82, respectivamente). O CSTB mostrou poder discriminatório na comparação entre pacientes com VHC e controles (AUC =0,74). Conclusão: O presente estudo confirma a sensibilidade do CSTB sérico no diagnóstico da hepatite C, e a expressão gênica de VEGF e GPC3 sérica conferem sensibilidade e especificidade para o diagnóstico de CHC.

Corrigendum: Novel Zinc-Related Differentially Methylated Regions in Leukocytes of Women With and Without Obesity.

[This corrects the article DOI: 10.3389/fnut.2022.785281.].

Novel Zinc-Related Differentially Methylated Regions in Leukocytes of Women With and Without Obesity.

Introduction: Nutriepigenetic markers are predictive responses associated with changes in "surrounding" environmental conditions of humans, which may influence metabolic diseases. Although rich in calories, Western diets could be linked with the deficiency of micronutrients, resulting in the downstream of epigenetic and metabolic effects and consequently in obesity. Zinc (Zn) is an essential nutrient associated with distinct biological roles in human health. Despite the importance of Zn in metabolic processes, little is known about the relationship between Zn and epigenetic. Thus, the present study aimed to identify the epigenetic variables associated with Zn daily ingestion (ZnDI) and serum Zinc (ZnS) levels in women with and without obesity. Materials and Methods: This is a case-control, non-randomized, single-center study conducted with 21 women allocated into two groups: control group (CG), composed of 11 women without obesity, and study group (SG), composed of 10 women with obesity. Anthropometric measurements, ZnDI, and ZnS levels were evaluated. Also, leukocyte DNA was extracted for DNA methylation analysis using 450 k Illumina BeadChips. The epigenetic clock was calculated by Horvath method. The chip analysis methylation pipeline (ChAMP) package selected the differentially methylated regions (DMRs). Results: The SG had lower ZnS levels than the CG. Moreover, in SG, the ZnS levels were negatively associated with the epigenetic age acceleration. The DMR analysis revealed 37 DMRs associated with ZnDI and ZnS levels. The DMR of PM20D1 gene was commonly associated with ZnDI and ZnS levels and was hypomethylated in the SG. Conclusion: Our findings provide new information on Zn's modulation of DNA methylation patterns and bring new perspectives for understanding the nutriepigenetic mechanisms in obesity.

Nutritional genomics, inflammation and obesity.

The Human Genome Project has significantly broadened our understanding of the molecular aspects regulating the homeostasis and the pathophysiology of different clinical conditions. Consequently, the field of nutrition has been strongly influenced by such improvements in knowledge - especially for determining how nutrients act at the molecular level in different conditions, such as obesity, type 2 diabetes, cardiovascular disease, and cancer. In this manner, characterizing how the genome influences the diet and vice-versa provides insights about the molecular mechanisms involved in chronic inflammation-related diseases. Therefore, the present review aims to discuss the potential application of Nutritional Genomics to modulate obesity-related inflammatory responses. Arch Endocrinol Metab. 2020;64(3):205-22.

IS THERE ANY CHANGE IN PHENOTYPIC CHARACTERISTICS COMPARING 5 TO 10 YEARS OF FOLLOW-UP IN OBESE PATIENTS UNDERGOING ROUX-EN-Y GASTRIC BYPASS?

BACKGROUND: : Bariatric surgery promotes significant weight loss and improvement of associated comorbidities; however, nutrients deficiencies and weight regain may occur in the middle-late postoperative period. AIM: To investigate nutritional status in 10 years follow-up. METHODS: : Longitudinal retrospective study in which anthropometric, biochemical indicators and nutritional intake were assessed before and after one, two, three, four, five and ten years of Roux-en Y gastric bypass through analysis of medical records. RESULTS: : After ten years there was a reduction of 29.2% of initial weight; however, 87.1% of patients had significant weight regain. Moreover, there was an increase of incidence of iron (9.2% to 18.5%), vitamin B12 (4.2% to 11.1%) and magnesium deficiency (14.1% to 14.8%). Folic acid concentrations increased and the percentage of individuals with glucose (40.4% to 3.7%), triglycerides (38% to 7.4%), HDL cholesterol (31 % to 7.4%) and uric acid (70.5% to 11.1%) abnormalities reduced. Also, there is a reduction of food intake at first year postoperative. After 10 years, there was an increase in energy, protein and lipid intake, also a reduction in folid acid intake. CONCLUSIONS: : Roux-en Y gastric bypass is an effective procedure to promote weight loss and improve comorbidities associated with obesity. However, comparison between postoperative period of five and 10 years showed a high prevalence of minerals deficiency and a significant weight regain, evidencing the need for nutritional follow-up in the postoperative period.

Obesity, weight loss, and influence on telomere length: New insights for personalized nutrition.

Telomeres are structures located at the ends of chromosomes associated with proteins, from the shelterin complex, which are responsible for the protection and preservation of the genetic material. The telomere length (TL) progressively decreases with each cell division, and recent evidence suggests that lifestyle can lead to telomere shortening. In individuals with obesity, excess adipose tissue plays a key role in inducing a chronic and systemic inflammatory state, which can cause TL shortening. Thus, the aim of the present review was to show the relationship between obesity and TL in addition to the possible risk factors for its shortening and how the different strategies for weight loss can modulate TL. As the crucial result, we can consider the association between TL and weight loss, and adiposity changes after different interventions, showing that TL may be used as a biomarker of responses to obesity treatment.

Green tea supplementation improves oxidative stress biomarkers and modulates IL-6 circulating levels in obese women.

INTRODUCTION: Introduction: obesity is associated with high levels of oxidative stress (OS) and inflammation. There is a lot of evidence that some polyphenols, such as green tea, have a positive impact on the OS state and consecutively, on inflammation. Objectives: the purposes of this study were: a) evaluate OS biomarkers in both obese and normal weight women; and b) evaluate if green tea supplementation has an impact on OS and inflammatory cytokine biomarkers of obese women. Methods: we evaluated obese (body mass index [BMI] ≥ 40 kg/m²) and normal weight (BMI between 18.5 and 24.9 kg/m²) women. Blood samples were used to access malondialdehyde (MDA), trolox equivalent antioxidant capacity (TEAC) and inflammatory cytokines. We randomly chose obese patients (18 individuals) and then gave them green tea supplementation for eight weeks. Statistical analysis included the Shapiro-Wilk, Wilcoxon, independent and paired t tests; p < 0.05 were considered as significant. Results: we enrolled 42 obese (BMI: 48.2 ± 9.3kg/m2) and 21 normal weight (BMI: 22.5 ± 2 kg/m2) women with an average age of 36.2 ± 9.1 years old. The serum levels of MDA were higher in obese (2.52 ± 0.31 µmol/l) than in eutrophic women (2.13 ± 0.26 µmol/l; p = 0.000). On the other hand, lower TEAC values were observed in the obese (0.75 ± 0.06 mM/l) than in the eutrophic group (0.78 ± 0.04 mM/l; p = 0.009). After the green tea intervention, MDA decreased 4.7% and TEAC increased 10%. Interleukin-6 (IL-6) serum levels decreased 12.7% after treatment (p = 0.03). Conclusions: a) the obese group had lower antioxidant capacity than eutrophic; and b) green tea supplementation ameliorated TEAC and MDA and reduced serum levels of IL-6 in obese women.

INTRODUCCIÓN: Introducción: la obesidad se asocia con altos niveles de estrés oxidativo (EO) e inflamación. Existe mucha evidencia de que algunos polifenoles, como el té verde, tienen un impacto positivo en el estado del EO y, consecutivamente, en la inflamación. Objetivos: los propósitos de este estudio fueron: a) evaluar los biomarcadores de EO en mujeres obesas y de peso normal; y b) evaluar si la suplementación con té verde tiene un impacto en el EO y biomarcadores de citoquinas inflamatorias de las mujeres obesas. Métodos: evaluamos mujeres obesas (índice de masa corporal [IMC] ≥ 40 kg/m²) y con peso normal (IMC entre 18,5 y 24,9 kg/m²). Se utilizaron muestras de sangre para determinar el malondialdehído (MDA), la capacidad antioxidante equivalente de trolox (TEAC) y las citoquinas inflamatorias. Elegimos al azar pacientes obesas (18 individuos) y luego les dimos suplementos de té verde durante ocho semanas. El análisis estadístico incluyó las pruebas de Shapiro-Wilk, Wilcoxon, t pareadas e independientes; p < 0,05 fueron considerados como significativos. Resultados: se reclutaron 42 mujeres obesas (IMC: 48,2 ± 9,3 kg/m2) y 21 de peso normal (IMC: 22,5 ± 2 kg/m2) con un promedio de edad de 36,2 ± 9,1 años. Los niveles séricos de MDA fueron más altos en las personas obesas (2,52 ± 0,31 µmol/L) que en las mujeres eutróficas (2,13 ± 0,26 µmol/L; p = 0,000). Por otro lado, se observaron valores TEAC más bajos en los obesos (0,75 ± 0,06 mM/L) que en el grupo eutrófico (0,78 ± 0,04 mM/L; p = 0,009). Después de la intervención con té verde, la MDA disminuyó 4.7% y el TEAC aumentó 10%. Los niveles séricos de interleucina-6 (IL-6) disminuyeron 12.7% después del tratamiento (p = 0,03). Conclusiones: a) mujeres obesas tienen menor capacidad antioxidante que las eutrófica; y b) la suplementación con té verde mejora TEAC y MDA y redujo los niveles séricos de IL-6 en mujeres obesas.

Role of eating disorders-related polymorphisms in obesity pathophysiology.

Human biological system provides innumerable neuroendocrine inputs for food intake control, with effects on appetite's modulation and the satiety signs. Its regulation is very complex, engaging several molecular interactions with many tissues, hormones, and neural circuits. Thus, signaling molecules that control food intake are critical for normal energy homeostasis and a deregulation of these pathways can lead to eating disorders and obesity. In line of this, genetic factors have a significantly influence of the regulation of neural circuits controlling the appetite and satiety pathways, as well as the regulation of brain reward systems. Single Nucleotide Polymorphisms (SNPs) in genes related to hypothalamic appetite and satiety mechanisms, further in multiple neurotransmitter systems may contribute to the development of major Eating Disorders (EDs) related to obesity, among them Binge Eating Disorder (BED) and Bulimia Nervosa (BN), which are discussed in this review.

Is there any change in phenotypic characteristics comparing 5 to 10 years of follow-up in obese patients undergoing roux-en-y gastric bypass? / Características fenotípicas de pacientes com obesidade submetidos a derivação gástrica em y-de-roux: qual as reais mudanças comparando-se 5 a 10 anos de acompanhamento?

ABSTRACT Background : Bariatric surgery promotes significant weight loss and improvement of associated comorbidities; however, nutrients deficiencies and weight regain may occur in the middle-late postoperative period. Aim: To investigate nutritional status in 10 years follow-up. Methods : Longitudinal retrospective study in which anthropometric, biochemical indicators and nutritional intake were assessed before and after one, two, three, four, five and ten years of Roux-en Y gastric bypass through analysis of medical records. Results : After ten years there was a reduction of 29.2% of initial weight; however, 87.1% of patients had significant weight regain. Moreover, there was an increase of incidence of iron (9.2% to 18.5%), vitamin B12 (4.2% to 11.1%) and magnesium deficiency (14.1% to 14.8%). Folic acid concentrations increased and the percentage of individuals with glucose (40.4% to 3.7%), triglycerides (38% to 7.4%), HDL cholesterol (31 % to 7.4%) and uric acid (70.5% to 11.1%) abnormalities reduced. Also, there is a reduction of food intake at first year postoperative. After 10 years, there was an increase in energy, protein and lipid intake, also a reduction in folid acid intake. Conclusions : Roux-en Y gastric bypass is an effective procedure to promote weight loss and improve comorbidities associated with obesity. However, comparison between postoperative period of five and 10 years showed a high prevalence of minerals deficiency and a significant weight regain, evidencing the need for nutritional follow-up in the postoperative period.

RESUMO Racional: A cirurgia bariátrica promove importante perda ponderal e melhora das comorbidades associadas; entretanto, deficiências nutricionais e reganho de peso podem ocorrer no pós-operatório médio e tardio. Objetivo: Investigar a evolução do estado nutricional de pacientes após cinco e 10 anos de pós-operatório. Método: Estudo retrospectivo longitudinal, no qual indicadores antropométricos, bioquímicos e a ingestão alimentar foram avaliados no período pré-operatório e após um, dois, três, quatro, cinco e dez anos da operação, por meio de revisão de prontuários. Resultados: Após 10 anos observou-se redução de 29,2% do peso inicial; no entanto, 87,1% dos pacientes tiveram reganho significativo de peso. Além disso, houve aumento da incidência de deficiência de ferro (9,2% para 18,5%), vitamina B12 (4,2% para 11,1%) e magnésio (14,1% para 14,8%). As concentrações de ácido fólico aumentaram e a porcentagem de indivíduos com alterações na glicemia (40,4% a 3,7%), triglicérides (38% a 7,4%), colesterol HDL (31% a 7,4%) e ácido úrico (70,5% a 11,1%) diminuiu. Além disso, houve redução na ingestão alimentar no primeiro ano de pós-operatório. Após 10 anos, houve aumento na ingestão de energia, proteína e lipídios, e redução na de ácido fólico. Conclusões: A derivação gástrica em Y-de-Roux é procedimento eficaz para promover perda de peso e melhorar as comorbidades associadas à obesidade. Entretanto, a comparação entre os períodos pós-operatórios de cinco e 10 anos mostrou que uma porcentagem de pacientes apresenta deficiências de vitaminas e minerais e reganho de peso significativo, evidenciando a necessidade do acompanho nutricional no período pós-operatório.

Mammalian target of rapamycin complex 2 signaling in obese women changes after bariatric surgery.

OBJECTIVES: After bariatric surgery, modifications to signaling pathway networks including those of the metabolic regulator called mammalian or mechanistic target of rapamycin (mTOR) may lead to molecular alterations related to energy source availability, systemic nutrients, and catabolic and anabolic cellular processes. This study aimed to identify gene expression changes with regard to the mTOR complex 2 subunit signaling pathway in obese patients before and after bariatric surgery. METHODS: The experimental group included 13 obese women who were examined before (preoperative) and 6 mo after (postoperative) Roux-en-Y gastric bypass (RYGB) surgery. The control group included nine apparently eutrophic women matched by age and without any other metabolic diseases (i.e., no diabetes and no liver or kidney diseases). Peripheral blood mononuclear cell samples were collected for RNA extraction and subsequent microarray analysis. RESULTS: After this methodological procedure, we identified 47 000 differentially expressed genes. A subsequent bioinformatic analysis showed that three diferentially expressed genes (rapamycin-insensitive companion of mTOR [RICTOR], phosphoinositide-3-kinase regulatory subunit 1 [PIK3 R1], and hypoxia inducible factor 1 alpha subunit 1A [HIF1 A]) participated in the mTOR signaling pathway. Real-time quantitative polymerase chain reaction revealed that RICTOR, PIK3 R1, and HIF1 A were upregulated 6 mo after RYGB surgery (P <0.05). In addition, patients in the experimental group lost weight significantly and presented significant improvement in biochemical/metabolic variables. CONCLUSIONS: The weight loss that was induced by RYGB surgery alters the mTOR signaling pathway and specifically the mTOR complex 2 subunit. The increased expression of genes that act in this pathway such as RICTOR, PIK3 R1, and HIF1 A reflects the induced weight loss and improved metabolic indicators (e.g., insulin resistance and lipolysis) that are evidenced in this study.

A new resting metabolic rate equation for women with class III obesity.

OBJECTIVE: Resting metabolic rate (RMR) is an important parameter to guide the nutritional therapy of class III obese patients. The aims of the present study were to develop a predictive equation for RMR estimation in class III obese women using anthropometric indicators and to compare indirect calorimetry with other predictive equations. METHODS: This was a cross-sectional study on women with class III obesity (body mass index >40 kg/m2). Weight, height, fat-free mass, fat mass, and RMR of all individuals were measured. Multiple linear regression was used to determine the new RMR equation and the Bland-Altman plot was used to analyze the agreement between indirect calorimetry and the results of predictive equations. RESULTS: We evaluated 101 women with obesity class III and a mean age of 36.3 ± 10 y. The anthropometric and body composition variables used in the new equation had a coefficient of determination of 0.80, and a significant influence on RMR (P = 0.01). Harris-Benedict and World Health Organization equations showed similar bias and limits (181.6, +2 SD = 765.5, -2 SD = -402.2; 156.4, +2 SD = 799.4, -2 SD = -486.6, respectively). The Mifflin-St Jeor and Owen equations showed large clinical bias (mean, 239.2 and 463.9, respectively), and a tendency to overestimate RMR. CONCLUSION: The prediction equations tested in the study had low accuracy in estimating RMR of women with class III obesity. However, our equation was developed specifically for this population, using variables known to influence their energy expenditure.

Influence of expression of UCP3, PLIN1 and PPARG2 on the oxidation of substrates after hypocaloric dietary intervention.

BACKGROUND & AIMS: In addition to environmental and psychosocial factors, it is known that genetic factors can also influence the regulation of energy metabolism, body composition and determination of excess weight. The objective of this study was to evaluate the influence of UCP3, PLIN1 and PPARG2 genes on the substrates oxidation in women with grade III obesity after hypocaloric dietary intervention. SUBJECTS/METHODS: This is a longitudinal study with 21 women, divided into two groups: Intervention Group (G1): 11 obese women (Body Mass Index (BMI) ≥40 kg/m2), and Control Group (G2): 10 eutrophic women (BMI between 18.5 kg/m2 and 24.9 kg/m2). Weight (kg), height (m), BMI (kg/m2), substrate oxidation (by Indirect Calorimetry) and abdominal subcutaneous adipose tissue were collected before and after the intervention. For the dietary intervention, the patients were hospitalized for 6 weeks receiving 1200 kcal/day. RESULTS: There was a significant weight loss (8.4 ± 4.3 kg - 5.2 ± 1.8%) and reduction of UCP3 expression after hypocaloric dietary intervention. There was a positive correlation between carbohydrate oxidation and UCP3 (r = 0.609; p = 0.04), PLIN1 (r = 0.882; p = 0.00) and PPARG2 (r = 0.791; p = 0.00) expression before dietary intervention and with UCP3 (r = 0.682; p = 0.02) and PLIN1 (r = 0.745; p = 0.00) genes after 6 weeks of intervention. There was a negative correlation between lipid oxidation and PLIN1 (r = -0.755; p = 0.00) and PPARG2 (r = 0.664; p = 0.02) expression before dietary intervention and negative correlation with PLIN1 (r = 0.730; p = 0.02) expression after 6 weeks of hypocaloric diet. CONCLUSION: Hypocaloric diet reduces UCP3 expression in individuals with obesity and the UCP3, PLIN1 and PPARG2 expression correlate positively with carbohydrate oxidation and negatively with lipid oxidation.

Changes in Global Transcriptional Profiling of Women Following Obesity Surgery Bypass.

BACKGROUND: Differential gene expression in peripheral blood mononuclear cells (PBMCs) after Roux-en-Y gastric bypass (RYGB) is poorly characterized. Markers of these processes may provide a deeper understanding of the mechanisms that underlie these events. The main goal of this study was to identify changes in PBMC gene expression in women with obesity before and 6 months after RYGB-induced weight loss. METHODS: The ribonucleic acid (RNA) of PBMCs from 13 obese women was analyzed before and 6 months after RYGB; the RNA of PBMCs from nine healthy women served as control. The gene expression levels were determined by microarray analysis. Significant differences in gene expression were validated by real-time quantitative polymerase chain reaction (RT-qPCR). RESULTS: Microarray analysis for comparison of the pre- and postoperative periods showed that 1366 genes were differentially expressed genes (DEGs). The main pathways were related to gene transcription; lipid, energy, and glycide metabolism; inflammatory and immunological response; cell differentiation; oxidative stress regulation; response to endogenous and exogenous stimuli; substrate oxidation; mTOR signaling pathway; interferon signaling; mitogen-activated protein kinases (MAPK), cAMP response element binding protein (CREB1), heat shock factor 1 (HSF1), and sterol regulatory element binding protein 1c (SREBP-1c) gene expression; adipocyte differentiation; and methylation. CONCLUSIONS: Six months after bariatric surgery and significant weight loss, many molecular pathways involved in obesity and metabolic diseases change. These findings are an important tool to identify potential targets for therapeutic intervention and clinical practice of nutritional genomics in obesity.

Comparison of gene expression profile between blood cells and white adipose tissue of patients with obesity

INTRODUCTION: Gene expression analyses from peripheral blood mononuclear cells (PBMC) and white adipose tissue are conflicting. It seems that results from single tissue are not enough to explain how changes affect humans as a complex biological system. OBJECTIVE: The aim of this study was to compare, from obesity subjects, PBMC and white adipose tissue gene expression that regulates adipogenesis (perilipin 1 [PLIN1], adrenoreceptor beta 3 [ADRB3] and peroxisome proliferator-activated receptor [PPARG2]) and the energy metabolism (uncoupling protein UCP1, UCP2 and UCP3) process. METHODS: This study enrolled 35 obese patients, with a body mass index (BMI) > 40 kg/m2 (obesity group [OG]), and ten eutrophic health subjects, 18 > BMI > 24.9 kg/m2 (control group [CG]). Anthropometric and body composition data were assessed at recruitment using standardized protocols. Samples of peripheral blood and subcutaneous adipose tissue (biopsy) were collected to analyze gene expression by RT-qPCR technique. For statistical analysis, we used the Shapiro-Wilk test and Wilcoxon tests by the SPSS software version 20.0; a p < 0.05 significance level was adopted. RESULTS: There were significant differences of PLIN1, ADRB3, PPARG2 and UCP3 expression between blood against adipose tissue samples, showing that these genes are upregulated in adipose tissue. UCP2 expression was upregulated in PBMC. CONCLUSION: The PLIN1, ADRB3, PPARG2 and UCP3 genes were preferentially expressed in adipose tissue. However, UCP2 was upregulated in PBMC, suggesting that this gene may be assessed in a peripheral blood cell, which is easily accessible, safe and practical.

VEGF Polymorphisms Related to Higher Serum Levels of Protein Identify Patients with Hepatocellular Carcinoma.

Hepatocellular carcinoma (HCC) is the most common primary neoplasia of the liver. Major risk factors for hepatocellular carcinoma include chronic liver diseases, carcinogenic agents, and genetic alterations as well as vascular endothelial growth factor (VEGF) involved in angiogenesis process. The aim of this study was to evaluate the association of VEGF-A (C936T and A1154G) with HCC and cirrhosis, in addition to serum levels of VEGF, clinical profile, lifestyle habits, and comorbidities. A total of 346 individuals were studied: 102 with HCC (G1), 117 with cirrhosis (G2), and 127 controls (G3). Polymorphisms were analysed by PCR/RFLP and serum levels of VEGF by ELISA. Alpha error was set at 5%. The wild-type genotype of both polymorphisms prevailed (P > 0.05). In G1, 23% of the patients died, with no relation to genetic profile (P > 0.05). Increased VEGF level was observed in G1 and G3, related to the mutant allele of VEGF-C936T and VEGF-A1154G, respectively, and compared with the wild-type genotype (P = 0.0285; P = 0.0284, resp.) as well as G1 versus G2 and G3 for VEGF-C936T and G1 versus G2 for VEGF-A1154G (P < 0.05 for both). In conclusion, there is a relationship between mutant alleles of VEGF-C936T and VEGF-A1154G polymorphisms and higher VEGF level, making them potential markers for HCC.