Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5684928 | Translational Research | 2017 | 9 Pages |
Abstract
The B-type natriuretic peptide (BNP) hormone plays a crucial role in the regulation of cardiovascular and energy homeostasis. Obesity is associated with low circulating levels of BNP, a condition known as “natriuretic handicap.” Recent evidences suggest an altered expression of BNP receptors-both the signaling natriuretic peptide receptors (NPR)-A and the clearance NPR-C receptor-in adipose tissue (AT) as one of the putative causes of natriuretic handicap. The current study aims at clarifying the molecular mechanisms behind the natriuretic handicap, focusing on NPR modulation in the AT of obese and control subjects. The study enrolled 34 obese and 20 control subjects undergoing bariatric or abdominal surgery, respectively. The main clinical and biochemical parameters, including circulating BNP, were assessed. In visceral (VAT) and subcutaneous AT (SAT) samples, collected during surgery, the adipocytes and stromal vascular fraction (SVF) expression of NPR-A and NPR-C and the SVF secretion of interleukin 6 (IL-6) were determined. Both VAT and SAT from obese patients expressed a lower NPR-A/NPR-C ratio in adipocytes and the SVF secreted a higher level of IL-6, compared with the controls. Moreover, NPR-A/NPR-C ratio expressed by VAT and SAT adipocytes negatively correlated with body mass index, insulin, the Homeostasis Model Assessment of Insulin resistance, and IL-6 secreted by SVF, and the expression of the clearance receptor NPR-C, in both the VAT and SAT adipocytes, showed a negative correlation with circulating BNP. Overall, insulin resistance/hyperinsulinemia and AT inflammation (ie, high level of IL-6) are the major determinants of the lower NPR-A/NPR-C ratio in adipocytes, thus contributing to the natriuretic handicap in obese subjects.
Keywords
GGTSVFNPRBNPGPTSATHDLhomeostasis model assessment of insulin resistanceAdipose tissuevisceral adipose tissueSubcutaneous adipose tissueGOTglutamic oxaloacetic transaminaseglutamic pyruvic transaminasebody mass indexBMILDLVATHOMAarbitrary unitsNatriuretic peptideB-type natriuretic peptideStromal vascular fractiontotal cholesterolHigh-density lipoprotein-cholesterolLow-density lipoprotein-cholesterolgamma-glutamyl transpeptidasenatriuretic peptide receptor
Related Topics
Health Sciences
Medicine and Dentistry
Medicine and Dentistry (General)
Authors
Alessandra Gentili, Maria Rosaria Frangione, Elisa Albini, Carmine Vacca, Maria Anastasia Ricci, Stefano De Vuono, Marcello Boni, Fabio Rondelli, Luciana Rotelli, Graziana Lupattelli, Ciriana Orabona,