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An avidin-biotin immunocytochemical technique was used to localize cells containing an insulin- or glucagon-like peptide in the major salivary glands of Sprague-Dawley rats. Cells with insulin-like staining were observed in the intercalated ducts of both the parotid and submandibular glands, but none were found in the sublingual gland. A discrete population of cells with intense glucagon-like immunostaining was associated with the acini of all three major salivary glands. This immunostaining only followed use of a glucagon antiserum with N-terminal specificity and not after incubation of tissues with an anti-glucagon serum having C-terminal specificity. These results suggest that rat salivary glands may contain peptides potentially capable of influencing substrate metabolism. In addition, the present findings indicate that the glucagon-like peptide found in salivary glands has a greater immunocytochemical similarity to glicentin (gut-type glucagon) and/or glucagon precursors than to the 3500 molecular weight pancreatic glucagon.

Immunocytochemical localization of insulin- and glucagonlike peptides in rat salivary glands.