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- W2018227917 abstract "We have recently shown that the intestinal hormone glucagon-like peptide-1 (GLP-1)-(7-36) amide is a cAMP-dependent stimulant of rat parietal cell H+ production. Epidermal growth factor (EGF) and transforming growth factor-alpha (TGF alpha) are known to inhibit histamine-stimulated parietal cell function by reducing cAMP production in a pertussis toxin-sensitive manner. Pertussis toxin blocks Gi alpha, the inhibitory subunit of adenylate cyclase, thereby preventing inhibitors from acting via Gi alpha. Therefore, we used pertussis toxin as a tool to determine whether EGF and TGF alpha inhibit GLP-1-stimulated parietal cell function via Gi alpha. In enriched (76 +/- 4%) rat parietal cells [14C]aminopyrine accumulation and cAMP production were maximally stimulated by GLP-1-(7-36) amide (10(-8) and 10(-7) M, respectively) or by histamine (10(-4) and 10(-3) M, respectively). EGF and TGF alpha (10(-13)-10(-7) M) caused concentration-dependent inhibition of GLP-1-stimulated parietal cell function. Maximal inhibition (33% and 37% of the response to GLP-1-(7-36) amide was observed at 10(-8) M EGF and 10(-9) M TGF alpha, respectively. There was a close correlation (r = 0.83; P < 0.05; n = 7) between the inhibition by EGF and TGF alpha of [14C]aminopyrine accumulation and the fall in cAMP production in GLP-1-stimulated parietal cells. The identical concentrations of both growth factors which maximally reduced GLP-1-stimulated parietal cell function inhibited [14C]aminopyrine accumulation in response to histamine by approximately 30%.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2018227917 title "Pertussis toxin-sensitive inhibition of glucagon-like peptide 1-stimulated acid production by epidermal growth factor and transforming growth factor α in rat parietal cells" @default.
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- W2018227917 doi "https://doi.org/10.1016/0922-4106(93)90010-7" @default.
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