Increased circulating and visceral adipose tissue expression levels of YKL-40 in obesity-associated type 2 diabetes are related to inflammation: impact of conventional weight loss and gastric bypass
Keywords: 
Diabetes mellitus, type 2/complications/metabolism/surgery
Glycoproteins/metabolism
Gastric bypass
Issue Date: 
2011
Publisher: 
Endocrine Society
ISSN: 
0021-972X
Citation: 
Catalan V, Gomez-Ambrosi J, Rodriguez A, Ramirez B, Rotellar F, Valenti V, et al. Increased circulating and visceral adipose tissue expression levels of YKL-40 in obesity-associated type 2 diabetes are related to inflammation: impact of conventional weight loss and gastric bypass. J Clin Endocrinol Metab 2011 Jan;96(1):200-209.
Abstract
Context: Plasma YKL-40 is elevated in patients with type 2 diabetes. The potential role of visceral adipose tissue (VAT) as a significant source of YKL-40 is unknown. Objective: In the study circulating and expression levels of YKL-40 were examined in VAT analyzing the contribution of adipocytes and stromovascular fraction cells (SVFCs).Wealso explored YKL-40’s implication in insulin resistance and inflammation and the effect of weight loss on plasma YKL-40 concentrations. PatientsandMethods: Samples obtained from 53 subjects were used in the study.Geneandprotein expression levels of YKL-40 were analyzed in VAT as well as in both adipocytes and SVFCs. In addition, circulating YKL-40 concentrations were measured before and after weight loss achieved either by Roux-en-Y gastric bypass (n 26) or after a conventional dietetic program (n 20). Results: Circulating concentrations and VAT expression of YKL-40 were increased in obese patients with type 2 diabetes (P 0.01) as well as associated with variables of insulin resistance and inflammation. No differences in YKL-40 expression levels between adipocytes and SVFCs were detected. Monocyte chemoattractant protein-1 and homeostasis model assessment emerged (P 0.01) as independent factors predicting circulating YKL-40. Elevated levels of YKL-40 in obese patients decreased after weight loss following a conventional hypocaloric diet (P 0.05) but not via a surgery-induced negative energy balance mediated by the Roux-en-Y gastric bypass. Conclusions: The association of increased YKL-40 mRNA and protein levels in VAT with its circulating concentrations indicates an important contribution of VAT in YKL-40 regulation. Furthermore, our data suggest a relevant role of glucose metabolism and inflammation on YKL-40 regulation.

Files in This Item:
File: 
J Clin Endocrinol Metab 2011. 200.pdf
Description: 
Size: 
291,25 kB
Format: 
Adobe PDF


Items in Dadun are protected by copyright, with all rights reserved, unless otherwise indicated.