Beta-endorphin and somatostatin in the pancreatic D-cell colocalization by immunocytochemistry

Utilizing highly specific antisera, beta-endorphin and somatostatin immunoreactivity were identified simultaneously in the D-cell of the pancreas of the rat, guinea pig, and man by the fluorescence-immunocytochemical technique. Our observations are consistent with a modulating role of beta-endorphin either within the D-cell or upon A and B cells, thereby regulating the secretion of insulin and glucagon.