Endothelin as an autocrine factor in the regulation of parathyroid cells - PubMed (original) (raw)

Endothelin as an autocrine factor in the regulation of parathyroid cells

Y Fujii et al. Proc Natl Acad Sci U S A. 1991.

Abstract

Endothelin, originally purified from porcine aortic endothelial cells, is widely distributed in tissues and is recognized as a product of epithelial cells, glial cells, and neurons in addition to endothelial cells. We found evidence by mRNA content and immunoreactivity that this peptide is synthesized in rat parathyroid epithelial cells (PT-r cells) and bovine parathyroid chief cells. The peptide synthesized by PT-r cells comigrated with synthetic endothelin 1 in reverse-phase HPLC and was diluted out in radioimmunoassay in parallel with the synthetic peptide. Bovine parathyroid endothelial cells (BPE-1 cells) did not express this peptide. Preproendothelin 1 mRNA expression by PT-r cells and endothelin 1 peptide production were regulated by calcium. Shifts in extracellular calcium either from high to low concentrations or vice versa elicited similar evanescent increases in expression of mRNA with a peak at 1 h. Synthesis of the peptide seems to be controlled by mRNA expression, and peptide in the medium appears to be continuously degraded or taken up by cells because its concentration in the medium showed a time course similar to that of mRNA expression. PT-r cells also bear a single class of receptors highly specific for endothelin 1, suggesting an autocrine regulation by endothelin 1 of the parathyroid. The facile regulation of endothelin concentrations in the medium by shifts in extracellular calcium concentration and possible autocrine regulation by endothelin 1 suggest that this peptide may mediate, at least in part, effects of calcium on the parathyroid system.

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