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Pituitary adenylate cyclase activating polypeptide (PACAP) stimulates growth hormone release from GH3 cells through
Y Murakami1, K Koshimura, K Yamauchi
1Department of Medicine, Shimane Medical University, Izumo, Japan.
Abstract:
Effect of pituitary adenylate cyclase activating polypeptide (PACAP) on growth hormone (GH) release from GH3 cells was studied in a dynamic superfusion system. PACAP-38 and PACAP-27 stimulated GH release from superfused GH3 cells. The stimulatory effect of PACAP-38 was comparable to those of vasoactive intestinal polypeptide (VIP) and PACAP-27 at a concentration of 1 nM, but the duration of action was more prolonged in PACAP-38 than in the other two peptides. PACAP(6-38), a selective antagonist of PACAP, as well as a VIP antagonist blunted the GH release induced by PACAP-38 and VIP. An antagonist of GH-releasing factor (GRF) at a concentration of 1 microM, however, did not affect the GH release induced by PACAP-38. These findings suggest that PACAP and VIP stimulate GH release from GH3 cells through type II PACAP receptor but not through the GRF receptors.