Abstract
Changes in body weight, concentrations of urine glucose, blood glucose, plasma insulin and FFA and hepatic enzyme activities were investigated in KK and C57BL mice treated with monosodium-L-aspartate (MSA). MSA was administered subcutaneously to neonates at a dose of 4 mg/g body weight. The MSA-treated KK and C57BL mice were remarkably obese at 10 weeks of age. The average plasma insulin concentration in the control KK mice was 73.6 μU/ml, over 4 times higher than in the control C57BL mice. In the control KK mice, hepatic glucokinase (GK) activity was quite low, and fructose-1, 6-bisphosphatase (FBP) and acetyl-CoA carboxylase (CBX) activity was much higher than in the control C57BL mice. In the MSA-treated KK and C57BL mice, the plasma insulin concentration increased to 2 to 3 times higher than in the controls. The MSA-treated C57BL mice showed an increase in GK and CBX activity and acceleration of obesity. In the MSA-treated KK mice, GK activity did not change and CBX activity decreased, and only FBP activity increased significantly. Glycosuria was induced and blood glucose and plasma FFA increased remarkably in all MSA-treated KK mice.
