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Transduction of the external signal into a cellular response involves activation of a cation receptor mechanism on the plasma membrane with rapid rise in the cytoplasmic calcium concentration of the cells. This recently discovered parathyroid calcium receptor has been characterized as a glycoprotein of unusually high molecular weight, which may play a key role in calcium homeostasis since it is also expressed in the kidney and placenta. Binding of external calcium to the receptor is associated with mobilization of intracellular calcium as well as calcium influx into the cells and phosphoinositol hydrolysis. These events rapidly interfere with the release process through essentially unknown mechanisms and probably also at sustained stimulation inhibit PTH gene transcription. The relative calcium insensitivity of the PTH release in HPT is associated with a deranged regulation of cytoplasmic calcium within pathological parathyroid cells. The molecular basis for this disturbance comprises down regulation of the cation receptor, whereby external calcium is translated into abnormally low levels of cytoplasmic calcium and insufficient inhibition of PTH release. Studies on expression of the functionally important cation sensing glycoprotein and its associated cellular signal systems may provide novel means for interference with the pathophysiological derangements of HPT.<\/jats:p>","DOI":"10.1007\/bf01665299","type":"journal-article","created":{"date-parts":[[2005,5,9]],"date-time":"2005-05-09T05:56:58Z","timestamp":1115618218000},"page":"672-680","source":"Crossref","is-referenced-by-count":22,"title":["Cellular physiology and pathophysiology of the parathyroid glands"],"prefix":"10.1002","volume":"15","author":[{"given":"G\u00f6ran","family":"\u00c5kerstr\u00f6m","sequence":"first","affiliation":[{"name":"Departments of Surgery Internal Medicine and Medical Cell Biology University of Uppsala Uppsala Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jonas","family":"Rastad","sequence":"additional","affiliation":[{"name":"Departments of Surgery Internal Medicine and Medical Cell Biology University of Uppsala Uppsala Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sverker","family":"Ljunghall","sequence":"additional","affiliation":[{"name":"Departments of Surgery Internal Medicine and Medical Cell Biology University of Uppsala Uppsala Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Peter","family":"Ridefelt","sequence":"additional","affiliation":[{"name":"Departments of Surgery Internal Medicine and Medical Cell Biology University of Uppsala Uppsala Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Claes","family":"Juhlin","sequence":"additional","affiliation":[{"name":"Departments of Surgery Internal Medicine and Medical Cell Biology University of Uppsala Uppsala Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Erik","family":"Gylfe","sequence":"additional","affiliation":[{"name":"Departments of Surgery Internal Medicine and Medical Cell Biology University of Uppsala Uppsala Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[1991,11]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/209052a0"},{"key":"e_1_2_1_3_1","first-page":"130","article-title":"PTH secretion in vivo and in vitro: Regulation by calcium and other secretagogues","volume":"8","author":"Brown E.M.","year":"1982","journal-title":"Miner. 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