Surgical removal of visceral fat decreases plasma free fatty acid and increases insulin sensitivity on liver and peripheral tissue in monosodium glutamate (MSG)-obese rats.
10.3346/jkms.1999.14.5.539
- Author:
Yong Woon KIM
1
;
Jong Yeon KIM
;
Suck Kang LEE
Author Information
1. Department of Physiology, College of Medicine, Yeungnam University, Taegu, Korea. ywkim@medical.yeungnam.ac.kr
- Publication Type:Original Article ; Research Support, Non-U.S. Gov't
- Keywords:
Obesity;
Rats;
Viscera;
Adipose tissue;
Insulin resistance;
Liver;
Fatty acids, nonesterified;
Glucose clamp thchnique
- MeSH:
Adipose Tissue/surgery*;
Adipose Tissue/metabolism*;
Animal;
Body Composition;
Cholesterol/blood;
Fatty Acids, Nonesterified/blood*;
Glucose Clamp Technique;
Glycogen Synthase/metabolism;
Insulin/blood*;
Liver/metabolism*;
Male;
Muscle, Skeletal/enzymology;
Obesity/surgery*;
Obesity/metabolism*;
Obesity/chemically induced;
Rats;
Rats, Sprague-Dawley;
Sodium Glutamate;
Triglycerides/blood
- From:Journal of Korean Medical Science
1999;14(5):539-545
- CountryRepublic of Korea
- Language:English
-
Abstract:
In order to evaluate the role of visceral and subcutaneous fat tissue in insulin sensitivity and lipid metabolism, we measured the fasting levels of plasma free fatty acid (FFA) and insulin, glucose disappearance rate (Rd), and hepatic glucose production rate (HGP) after surgical removal of visceral (VF) or subcutaneous (SF) fat tissue in monosodium glutamate-obese (MSG-Ob) rats. Monosodium glutamate obesity was induced in rats by neonatal injection of MSG. Surgery to remove fat was done at 15 weeks of age. The experiments were done four weeks after the surgery. MSG-Ob rats showed increased levels of FFA, insulin, and HGP and decreased Rd compared to normal rats. In the VF group, the FFA level and HGP were decreased to normal values, Rd was partially normalized, but the level of insulin did not change significantly compared to MSG-Ob. In the SF group, FFA and Rd were partially normalized, but HGP was not suppressed significantly compared to MSG-Ob. These results suggest that visceral fat affects the insulin sensitivity of liver and FFA concentration more than subcutaneous fat; however, no significant difference was shown on whole body insulin sensitivity and fasting insulin concentration.
