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Impact of bariatric surgery on RNA-seq gene expression profiles of adipose tissue in humans

ABSTRACT: Bariatric surgery is the most effective therapy of severe human obesity. It is associated with improvements in metabolic and non metabolic co-morbidities which are thought to be mediated by a decrease of adipose tissue inflammation. However, the molecular mechanisms behind these beneficial effects are poorly understood. We analyzed expression profiles in subcutaneous adipose tissue from 22 obese women before and 3 months after surgery using the RNA-seq technology. Of 15,972 detected genes, 1214 were differentially expressed after surgery. Upregulated genes were mostly involved in the basal cellular machinery. Downregulated genes were enriched in metabolic functions of adipose tissue. At baseline, we identified 26 modules of coexpressed genes. The four most stable modules reflected the innate and adaptive immune responses of adipose tissue, including a general signature of innate immune cells, an adaptive immune response elicited by T lymphocytes, a neutrophil-mediated inflammatory signature and an interferon-signaling pathway, respectively. After surgery, a few crucial molecules involved in chemotaxis and activation of immune cells were disconnected from their respective networks. These molecules may represent therapeutic targets against adipose inflammation.

ORGANISM(S): Homo sapiens

PROVIDER: GSE65540 | GEO | 2015/03/31

SECONDARY ACCESSION(S): PRJNA274360

REPOSITORIES: GEO

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Impact of bariatric surgery on RNA-seq gene expression profiles of adipose tissue in humans

Project description:Bariatric surgery is the most effective therapy of severe human obesity. It is associated with improvements in metabolic and non metabolic co-morbidities which are thought to be mediated by a decrease of adipose tissue inflammation. However, the molecular mechanisms behind these beneficial effects are poorly understood. We analyzed expression profiles in subcutaneous adipose tissue from 22 obese women before and 3 months after surgery using the RNA-seq technology. Of 15,972 detected genes, 1214 were differentially expressed after surgery. Upregulated genes were mostly involved in the basal cellular machinery. Downregulated genes were enriched in metabolic functions of adipose tissue. At baseline, we identified 26 modules of coexpressed genes. The four most stable modules reflected the innate and adaptive immune responses of adipose tissue, including a general signature of innate immune cells, an adaptive immune response elicited by T lymphocytes, a neutrophil-mediated inflammatory signature and an interferon-signaling pathway, respectively. After surgery, a few crucial molecules involved in chemotaxis and activation of immune cells were disconnected from their respective networks. These molecules may represent therapeutic targets against adipose inflammation. mRNA sequencing of subcutaneous adipose tissue (SAT) samples from 22 obese women before and 3 months after bariatric surgery

2015-03-31 | E-GEOD-65540 | biostudies-arrayexpress

Obesity disrupts innate-adaptive immune network patterning in adipose tissue

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Obesity disrupts innate-adaptive immune network patterning in adipose tissue

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Project description:Subcutaneous adipose tissue and visceral adipose tissue samples were obtained from severely obese individuals that underwent bariatric surgery. The goal of this study was to compare genome-wide gene expression levels in the two tissue types from healthy and unhealthy severely obese individuals. Whole-transcriptome subcutaneous adipose tissue gene expression levels were determined in 73 individuals with a BMI >35 kg/m2. Whole-transcriptome visceral adipose tissue gene expression levels were determined in 69 individuals with a BMI >35 kg/m2. Modules of co-expressed genes likely to be functionally related were identfied and correlated with BMI, plasma levels of glucose, insulin, HbA1c, triglycerides, non-esterified fatty acids, ALAT, ASAT, C-reactive protein, and LDL- and HDL cholesterol.

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Project description:The aim of this study was to characterize expression profiles of visceral and subcutaneous adipose tissue in children. Adipose tissue samples were collected from children having elective surgery (n=71, [54 boys], 6.0 +- 4.3 years). Affymetrix microarrays (n=20) were performed to characterize the functional profile and identify genes of interest in adipose tissue. Visceral adipose tissue had an overrepresentation of Gene Ontology themes related to immune and inflammatory responses and subcutaneous adipose tissue had an overrepresentation of themes related to adipocyte growth and development. Likewise, qPCR performed in the whole cohort showed a 30-fold increase in haptoglobin (P < 0.005), 7-fold increase in IL-10 (P < 0.001), 8-fold decrease in VEGF (P < 0.01) and a 28-fold decrease in TBOX15 (P < 0.001) in visceral compared to subcutaneous adipose tissue.The inflammatory pattern in visceral adipose tissue may represent an early stage of the adverse effects of this depot, and combined with chronic obesity, may contribute to increased metabolic and cardiovascular risk. 20 human samples from pre-pubertal boys and girls were assessed for differences in expression between subcutaneous (n=15) and visceral fat (n=5), with 1 microarray per subject

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