- Gastric inhibitory polypeptide and glucagon-like peptide-1(7-36) amide exert similar effects on somatostatin secretion but opposite effects on gastrin secretion from the rat stomach. Jia, X., Brown, J.C., Kwok, Y.N., Pederson, R.A., McIntosh, C.H. Can. J. Physiol. Pharmacol. (1994)