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- W2062456579 abstract "Receptor-specific agonists of the extracellular calcium-sensing receptor (CaSR) potentiate glucose-induced insulin secretion, an effect similar to that of glucagon-like peptide-1 (GLP-1). We have sequenced the full open reading frame of the CaSR from rat insulinoma (INS-1) cells and find that the predicted amino acid sequence of the receptor is identical with that of the receptor from the parathyroid gland. This receptor couples to both Gq/11 and Gi/o, and this dual coupling may partly explain the varying effects of nonspecific agonists on secretion reported previously. l-Histidine (l-His) increases the sensitivity of the CaSR to extracellular Ca2+ and potentiates glucose-dependent insulin secretion from INS-1 cells. This potentiation is partially inhibited at low extracellular [Ca2+] where the CaSR is ineffective. Coexpression of the CaSR and GLP-1 receptor (GLP-1R) produces a pertussis toxin-sensitive inhibition of GLP-1-induced cAMP production in response to elevated extracellular [Ca2+]. However, l-His potentiates cAMP response element reporter activity in INS-1 cells and in human embryonic kidney-293 cells expressing either the GLP-1R alone or the CaSR and GLP-1R. INS-1 cells express the RNA for the CaSR at a lower level than that for the GLP-1R. This difference in expression level of the receptors may explain the potentiation of insulin secretion by l-His despite coupling of the CaSR to Gi/o. In conclusion, l-His can potentiate both GLP-1R- and CaSR-activated signaling pathways, and these effects may play a role in the potentiation of glucose-induced insulin secretion in response to meals containing protein in addition to carbohydrates and fat." @default.
- W2062456579 created "2016-06-24" @default.
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- W2062456579 date "2003-11-01" @default.
- W2062456579 modified "2023-09-26" @default.
- W2062456579 title "Regulation of Glucagon-Like Peptide-1 Receptor and Calcium-Sensing Receptor Signaling by l-Histidine" @default.
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- W2062456579 doi "https://doi.org/10.1210/en.2003-0498" @default.
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