Effects of synthetic rat C-peptide in normal and diabetic rats

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Abstract
The effects of synthetic rat C-peptide 1 and C-peptide 2 on plasma insulin and blood glucose concentrations in the rat were studied. Infusion of rat C-peptide (500μg·h-1· kg-1) diminished glucose induced increase of plasma insulin by 56% (15.2±0.9 versus 6.6± 0.6 ng/ml, p-1·kg-1 body weight inhibited glucose-induced insulin secretion by 33%. In the presence of a mixture of both C-peptides or somatostatin, blood glucose after intravenous glucose was higher than in the control experiments. In alloxan-diabetic rats, C-peptide (160 μg/kg) significantly increased and prolonged the hypoglycaemic effect of exogenous insulin. It is suggested that C-peptide may not be a biologically inert substance.