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- W2399828032 abstract "Endothelins (ETs) are 21 amino acid peptides with vasoactive and mitogenic properties. The three isopeptides (ET-1, -2, and -3) and their receptors (E1A and ETB subtypes) display expression in numerous tissues and possibly mediate autocrine/paracrine actions. The present investigation shows that ET-1 triggers biphasic increases of the concentration of cytoplasmic Ca2+ ([Ca2+]i) in pathological human parathyroid cells. Both the peak and sustained [Ca2+]i increase, as well as the proportion of responding cells, are dose-dependent in the 10(-10)-10(-7) mol/L range of ET-1. In absence of external Ca2+, the ET-1-induced [Ca2+]i peak is attenuated. ET-3 has no effect on [Ca2+]i indicating functional dominance of the ETA receptor subtype. ET-1 (10 nmol/L) lowers parathyroid hormone secretion in 0.5 mmol/L but not in higher external Ca2+ concentrations, and parathyroid cell ET release is inhibited by increases of external Ca2+. Fibroblasts overgrowing the parathyroid chief cells during monolayer culture respond to ET-1 with biphasic [Ca2+]i increases or repetitive [Ca2+]i spikes, but show no response to elevation of external Ca2+. These findings imply that ET secretion and ET receptor expression may constitute an autocrine/paracrine mechanism in the regulation of human PTH secretion." @default.
- W2399828032 created "2016-06-24" @default.
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- W2399828032 date "1997-01-01" @default.
- W2399828032 modified "2023-10-16" @default.
- W2399828032 title "Endothelin-induced calcium signaling and secretion in chief cells and fibroblasts from pathological human parathyroid glands." @default.
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