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- W2071265276 abstract "Extracellular Ca(2+)-sensing receptor (CaSR) has been recently identified in rat and mouse pituitary and in AtT-20 cells. The aim of the study was to investigate the presence of CaSR in the human pituitary and its signaling pathway. Normal parathyroid biopsies, autoptic normal pituitaries, and seven nonfunctioning and six GH-secreting adenomas were studied. Southern blot analysis of the RT-PCR products from pituitary adenomas indicated that the PCR fragments obtained were products of specific amplification of CaSR messenger ribonucleic acid. Sequence analysis showed nucleotide identity of these products with the available human parathyroid CaSR. By immunoblotting analysis CaSR, was detected in normal and adenomatous pituitary tissues. In all tumors studied, extracellular Ca2+ (2.5 mmol/L) induced a significant increase in intracellular Ca2+, mainly due to Ca2+ mobilization (from 82.7+/-11 to 148+/-36 nmol/L; P < 0.001). Similar results were obtained with the CaSR activators gadolinium and neomycin. Moreover, CaSR activators significantly increased cAMP levels; this effect was not mimicked by other agents able to increase intracellular Ca2+, such as TRH. CaSR agonists did not increase resting GH secretion in any GH-secreting adenomas, but amplified the GH response to GHRH. In this study we first demonstrate CaSR expression in the human pituitary and provides evidence for an additional mechanism by which calcium might regulate pituitary cell function." @default.
- W2071265276 created "2016-06-24" @default.
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- W2071265276 date "1999-08-01" @default.
- W2071265276 modified "2023-09-27" @default.
- W2071265276 title "Expression of Calcium-Sensing Receptor and Characterization of Intracellular Signaling in Human Pituitary Adenomas1" @default.
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- W2071265276 doi "https://doi.org/10.1210/jcem.84.8.5922" @default.
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