C-peptide, Insulin and Proinsulinlike Components in Diabetic and Nondiabetic Human Pancreas

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The contents of insulin and C-peptide extractable with acid alcohol from the tail of the pancreas and insulinoma were investigated, using gel filtration in seven nondiabetics including two patients with insulinoma and eight diabetics. The gel filtration patterns of both C-peptide and insulin in pancreatic extract were fairly stable even after the pancreas had been left for 14 hrs in the room temperature. In non-diabetics except cases of insulinoma the content of insulin in pancreas ranged from 1.42 to 4.56U per gram and that of C-peptide from 8.76 to 25.63μg per gram wet pancreas. The proportion of proinsulinlike components (PLC) ranged from0.01to 2.04% of insulin plus PLC. In diabetics insulin content was low and ranged from 0 to 1.68 U per gram and that of C-peptide from 0 to 14.48μg per gram wet pancreas. In insulinoma, both insulin and C-peptide increased and PLC occupied 5.48 and 5.96%, respectively.
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