Dataset Information

Adipose Tissue Protein Glycoxidation is Associated with Weight-Loss Potential.

ABSTRACT: OBJECTIVE:This study aimed to characterize the differences in protein oxidation biomarkers in adipose tissue (AT) as an indicator of AT metabolism and bariatric surgery weight-loss success. METHODS:A human model, in which sixty-five individuals with obesity underwent bariatric surgery, and a diet-induced obesity animal model, in which animals were treated for 2 months with normocaloric diets, were analyzed to determine the associations between AT protein oxidation and body weight loss. Protein oxidative biomarkers were determined by gas chromatography/mass spectrometry in AT from human volunteers before the surgery, as well as 2 months after a diet treatment in the animal model. RESULTS:The levels of carboxyethyl-lysine (CEL) and 2-succinocystein (2SC) in both visceral and subcutaneous AT before the surgery directly correlated with greater weight loss in both human and animal models. 2SC levels in subcutaneous AT greater than 4.7 × 106 ?mol/mol lysine (95% CI: 3.4 × 106 to 6.0 × 106 ) may predict greater weight loss after bariatric surgery (receiver operating characteristic curve area?=?0.8222; P?=?0.0047). Additionally, it was observed that individuals with diabetes presented lower levels of CEL and 2SC in subcutaneous AT (P?=?0.0266 and P?=?0.0316, respectively) compared with individuals without diabetes. CONCLUSIONS:CEL and 2SC in AT are useful biomarkers of AT metabolism and predict the individual's ability to reduce body weight after bariatric surgery.

SUBMITTER: Serrano JCE

PROVIDER: S-EPMC6618070 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature

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Adipose Tissue Protein Glycoxidation is Associated with Weight-Loss Potential.

Serrano José C E JCE Baena-Fustegueras Juan Antonio JA Martin-Gari Meritxell M Rassendren Helene H Cassanye Anna A Naudí Alba A López-Cano Carolina C Sánchez Enric E de la Fuente-Juárez María Cruz MC Herrerías González Fernando F Olsina Kissler Jorge J JJ Lecube Albert A Portero-Otín Manuel M

Obesity (Silver Spring, Md.) 20190521 7

<h4>Objective</h4>This study aimed to characterize the differences in protein oxidation biomarkers in adipose tissue (AT) as an indicator of AT metabolism and bariatric surgery weight-loss success.<h4>Methods</h4>A human model, in which sixty-five individuals with obesity underwent bariatric surgery, and a diet-induced obesity animal model, in which animals were treated for 2 months with normocaloric diets, were analyzed to determine the associations between AT protein oxidation and body weight ...[more]

PMID: 31112015

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Project description:Background/objectivesNumerous hepatokines are involved in inter-organ cross talk regulating tissue-specific insulin sensitivity. Adipose tissue lipolysis represents a crucial element of adipose insulin sensitivity and is substantially involved in long-term body weight regulation after dietary weight loss. Thus, we aimed to analyze the impact of the hepatokine Fetuin-B in the context of weight loss induced short- and long-term modulation of adipose insulin sensitivity.Subjects/methods143 subjects (age > 18; BMI ≥ 27 kg/m2) were analyzed before (T-3) and after (T0) a standardized 12-week dietary weight reduction program. Afterward, subjects were randomized to a 12-month lifestyle intervention or a control group. After 12 months (T12) no further intervention was performed until 6 months later (T18) (Maintain-Adults trial). Tissue-specific insulin sensitivity was estimated by HOMA-IR (predominantly liver), ISIClamp (predominantly skeletal muscle), and free fatty acid suppression during hyperinsulinemic-euglycemic clamp (FFASupp) (predominantly adipose tissue). Fetuin-B was measured at all concomitant time points.ResultsCirculating Fetuin-B levels correlated significantly with estimates of obesity, hepatic steatosis as well as HOMA-IR, ISIClamp, FFASupp at baseline. Fetuin-B decreased during dietary weight loss (4.2 (3.5-4.9) vs. 3.8 (3.2-4.6) µg/ml; p = 2.1 × 10-5). This change was associated with concomitant improvement of HOMA-IR (r = 0.222; p = 0.008) and FFASupp (r = -0.210; p = 0.013), suggesting a particular relationship to hepatic and adipose tissue insulin sensitivity. Weight loss induced improvements of insulin resistance were almost completely preserved until months 12 and 18 and most interestingly, the short and long-term improvement of FFASupp was partially predicted by baseline level of Fetuin-B.ConclusionsOur data suggest that Fetuin-B might be a potential mediator of liver-adipose cross talk involved in short- and long-term regulation of adipose insulin sensitivity, especially in the context of diet-induced weight changes.Trial registrationClinicalTrials.gov number: NCT00850629, https://clinicaltrials.gov/ct2/show/NCT00850629 , date of registration: February 25, 2009.

Project description:We investigated the regulation of adipose tissue (AT) gene expression during different phases of a dietary weight loss program and its relationship with insulin sensitivity. Obese women followed a weight reduction program composed of an energy restriction phase (ER) with a 4-week very-low-calorie diet and a weight stabilization period (WS) composed of a 2-month low-calorie diet followed by 3 to 4 months of a weight maintenance diet. At each time point, body composition, plasma parameters and glucose disposal rate were assessed and subcutaneous AT biopsies were performed. Variations in mRNA levels were determined using DNA microarrays and reverse transcription-quantitative PCR. Distinct sets of AT genes are regulated during calorie restriction and weight stabilization revealing an unexpected temporal pattern in the link between AT and insulin sensitivity during weight loss. Experiment Overall Design: Fifteen obese premenopausal women were recruited at the Third Faculty of Medicine of Charles University and at the Institute for Mother and Child Care in Prague, Czech Republic. During the first four weeks of the dietary intervention program, the subjects received an energy restricted diet of 800 kcal/day (liquid formula diet, Redita, Promil). During the next two months, a low-calorie diet was designed to provide 600 kcal/day less than the individually estimated energy requirement based on an initial resting metabolic rate multiplied by 1.3. Following this, subjects entered a weight maintenance phase for a period of 3 to 4 months, during which the patients were instructed to keep their weight stable. A complete clinical investigation in the fasting state was realized before and at the end of each phase. Needle microbiopsy of subcutaneous AT was performed under local anesthesia (1% Xylocaine) from the abdominal region (14â20 cm lateral to the umbilicus). Total RNA were isolated from AT samples with Qiagen RNeasy kit. RNA quantity and quality were checked with the Experion automated electrophoresis system (BioRad laboratories). We performed a whole transcriptome analysis comparing 1) before vs. after the initial 4 weeks severe energy restriction (ER), 2) after energy restriction vs. after weight stabilization (WS) and 3) before dietary intervention vs. after weight stabilization (DI). Eight subjects representative of the cohort were selected, matched for high quality of total RNA samples, insulin sensitivity and weight changes during the study. Targets for microarray experiments were generated from 500 ng of total RNA with Agilent low RNA input amplification kit (Agilent Technologies) and hybridized to whole genome 44k oligonucleotide arrays (Agilent Technologies). Each combination of samples was analyzed twice using a dye swap design (i.e., a total of 48 hybridizations). Data acquisition from microarrays was obtained with a GenePix 4000B scanner (Axon instruments) and image processing was performed with Feature Extraction 8.5 (Agilent Technologies). Raw data were normalized with a global Lowess procedure and filtered with R package LIMMA (Bioconductor). Outlier replicates and spots with a signal to noise ratio lesser than 2 on both red and green channel were eliminated from our analyses. Mean log ratios were calculated from paired duplicates before normalization. Differentially expressed genes were identified with Significance Analysis of Microarray (SAM) procedure.

Dataset Information

Adipose Tissue Protein Glycoxidation is Associated with Weight-Loss Potential.

Publications

Adipose Tissue Protein Glycoxidation is Associated with Weight-Loss Potential.

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