Insulin release from mouse islets perifused with serum IgG from newly insulin-dependent diabetics

In the present study we have investigated the effect of IgG isolated from sera of newly diagnosed insulin-dependent diabetic patients (IDD-IgG) on insulin release of column-perifused isolated mice islets of Langerhans in the presence and absence of guinea pig complement. The insulin release is highly significantly (p less than 0.01) increased by IDD-IgG as compared with normal serum IgG in the presence of untreated as well as heat-inactivated GPNS. However, complement exposure suppressed insulin release significantly (p less than 0.01) in each period of perifusion. After perifusion in the presence of complement the arginine-stimulated insulin secretion was 6 times lower than without complement exposure of perifused islets before.