Reduction of beta cell mass: partial insulin secretory compensation from the residual beta cell population in the nicotinamide-streptozotocin Göttingen minipig after oral glucose in vivo and in the perfused pancreas

A progressive loss of beta cell function and mass are important contributory factors in the development and progression of type 2 diabetes. The aim of this study was to evaluate the effects of a primary reduction in beta cell mass on beta cell function in vivo and in the perfused pancreas and to relate these characteristics to beta cell mass. The beta cell mass of six Göttingen minipigs was reduced chemically (using 67 mg/kg nicotinamide and 125 mg/kg streptozotocin). Six untreated minipigs were kept as control animals. Insulin responses were evaluated in vivo using the mixed meal tolerance test (2 g/kg oral glucose) and in the isolated perfused pancreata from the same animals by stimulation with glucose, glucagon-like peptide-1 or arginine. Beta cell mass was reduced in the beta-cell-reduced animals compared with the control minipigs (182+/-76 vs 464+/-156 mg, p