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DR Patel, Y Kong and SP Sreedharan
Department of Medicine, University of California School of Medicine, San Francisco 94143.
Secretin is a 27-amino acid neuroendocrine peptide that stimulates fluid and electrolyte secretion in the gastrointestinal tract, activates tyrosine hydroxylase activity in the central nervous system, and affects cardiac and renal function. Specific receptors for secretin have been previously characterized on neuroblastoma cells, pancreatic acini, gastric glands, and liver cholangiocytes. We report here the isolation of a 1616-base pair cDNA from human lung tissue that encodes a 440-amino acid, 50-kDa, G protein-coupled human secretin receptor (HSR), with homology of 80% with the rat secretin receptor and 37% with the human type I vasoactive intestinal peptide receptor. Northern blot analysis of human tissue mRNA revealed that the relative intensity for expression of a 2.1-kilobase HSR transcript was pancreas > kidney > small intestine > lung > liver, with trace levels in brain, heart, and ovary. Stable transfectants of HSR in human embryonic kidney 293 cells, termed 293S12, expressed 10(5) binding sites/cell for 125I-secretin, with an apparent Kd of 3.2 nM. Vasoactive intestinal peptide, pituitary adenylyl cyclase-activating peptide-38, and glucagon were less potent (by 3 orders of magnitude) than secretin in competitively inhibiting 125I-secretin binding to 293S12 cells. Secretin evoked concurrent dose- dependent increases in intracellular cAMP and calcium levels in 293S12 cells and stimulated a 4-fold increase in phosphatidylinositol hydrolysis. Thus, the HSR expressed by stable transfectants can couple to two distinct intracellular signaling pathways.
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