In vivo lipolysis in adipose tissue from two anatomical locations measured by microdialysis

• Published in: Life sciences (1973) 2000-06, Vol.67 (4), p.437-445
• Main Authors: Portillo, Marı́a Puy, Villaro, José Marı́a, Torres, Marı́a Isabel, Macarulla, Marı́a Teresa
• Format: Article
• Language: English
• Subjects: Adipose Tissue - drug effects; Adipose Tissue - metabolism; Adrenergic beta-Agonists - pharmacology; Animals; Blood Flow Velocity - drug effects; Dose-Response Relationship, Drug; Epididymal adipose tissue; Epididymis - drug effects; Epididymis - metabolism; Food Deprivation; Glycerol - metabolism; Isoproterenol; Isoproterenol - pharmacology; Lipolysis; Lipolysis - drug effects; Male; Microdialysis; Pelvis; Rats; Rats, Sprague-Dawley; Skin - drug effects; Skin - metabolism; Subcutaneous adipose tissue
• ISSN: 0024-3205; 1879-0631
• DOI: 10.1016/S0024-3205(00)00642-1

In this study, the difference in lipolytic response in inguinal subcutaneous and epididymal adipose tissues of male Sprague-Dawley rats was assessed in vivo by microdialysis. Probes were perfused with Ringer solution in which increasing concentrations of isoproterenol (10 −7–10 −4mol/L) were added. Glycerol release, expressed as extracellular glycerol concentration, was used as lipolytic index. The effect of isoproterenol on local blood flow was investigated using the ethanol technique. No differences were found in the interstitial glycerol concentration between both adipose tissues under basal conditions. When isoproterenol was perfused, a dose-response increase in glycerol production was induced in both tissues. Interstitial glycerol concentration from epididymal adipose tissue was higher than that of inguinal subcutaneous depot at all isoproterenol concentrations. No vasodilatory effect of isoproterenol was found. These results suggest that epididymal adipose tissue is more responsive in vivo to β-adrenergic lipolysis stimulation than is subcutaneous fat pad from the inguinal region.