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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Bariatric surgery can acutely modulate ER-stress and inflammation on subcutaneous adipose tissue in non-diabetic patients with obesity

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Ferraz-Bannitz, Rafael [1] ; Welendorf, Caroline Rossi [1] ; Coelho, Priscila Oliveira [1] ; Salgado, Jr., Wilson [2] ; Nonino, Carla Barbosa [3] ; Beraldo, Rebeca A. [1] ; Foss-Freitas, Maria Cristina [1]
Total Authors: 7
[1] Univ Sao Paulo, Ribeirao Preto Med Sch, Dept Internal Med, Div Endocrinol & Metab, Ave Bandeirantes 3900, BR-14049900 Ribeirao Preto, SP - Brazil
[2] Univ Sao Paulo, Ribeirao Preto Med Sch, Dept Surg & Anat, Ribeirao Preto, SP - Brazil
[3] Univ Sao Paulo, Ribeirao Preto Med Sch, Lab Nutrigen Studies, Ribeirao Preto, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: DIABETOLOGY & METABOLIC SYNDROME; v. 13, n. 1 FEB 16 2021.
Web of Science Citations: 0

Background Bariatric surgery, especially Roux-en-Y gastric bypass (RYGB), is the most effective and durable treatment option for severe obesity. The mechanisms involving adipose tissue may be important to explain the effects of surgery. Methods We aimed to identify the genetic signatures of adipose tissue in patients undergoing RYGB. We evaluated 13 obese, non-diabetic patients (mean age 37 years, 100% women, Body mass index (BMI) 42.2 kg/m(2)) one day before surgery, 3 and 6 months (M) after RYGB. Results Analysis of gene expression in adipose tissue collected at surgery compared with samples collected at 3 M and 6 M Post-RYGB showed that interleukins {[}Interleukin 6, Tumor necrosis factor-alpha (TNF-alpha), and Monocyte chemoattractant protein-1(MCP1)] and endoplasmic reticulum stress (ERS) genes {[}Eukaryotic translation initiation factor 2 alpha kinase 3 (EIF2AK3) and Calreticulin (CALR)] decreased during the follow-up (P <= 0.01 for all). Otherwise, genes involved in energy homeostasis {[}Adiponectin and AMP-activated protein kinase (AMPK)], cellular response to oxidative stress {[}Sirtuin 1, Sirtuin 3, and Nuclear factor erythroid 2-related factor 2 (NRF2)], mitochondrial biogenesis {[}Peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC1 alpha)] and amino acids metabolism {[}General control nonderepressible 2 (GCN2)] increased from baseline to all other time points evaluated (P <= 0.01 for all). Also, expression of Peroxisome proliferator-activated receptor gamma (PPAR) (adipogenesis regulation) was significantly decreased after RYGB (P < 0.05). Additionally, we observed that PGC1 alpha, SIRT1 and AMPK strongly correlated to BMI at 3 M (P <= 0.01 for all), as well as ADIPOQ and SIRT1 to BMI at 6 M (P <= 0.01 for all). Conclusions Our findings demonstrate that weight loss is associated with amelioration of inflammation and ERS and increased protection against oxidative stress in adipose tissue. These observations are strongly correlated with a decrease in BMI and essential genes that control cellular energy homeostasis, suggesting an adaptive process on a gene expression level during the caloric restriction and weight loss period after RYGB. Trial registration CAAE: 73,585,317.0.0000.5440 (AU)

FAPESP's process: 15/12133-0 - Study of metabolic and molecular alterations involved in caloric restriction and hypoproteic diet in humans.
Grantee:Rafael Ferraz Bannitz
Support type: Scholarships in Brazil - Doctorate