Abstract:Calcitonin secretion by C-cells is mediated through intracellular 3'5'-cyclic adenosine monophosphate (cAMP) and calcium signaling. Calcitonin release stimulation tests may take advantage of both signaling cascades in screening for medullary thyroid carcinomas (MTC). To elucidate the regulation of the adenylyl cyclase system we have determined cAMP levels of a calcitonin-expressing MTC cell line (RG) after exposure to adrenergic agents and prostaglandines. In early passages (20-30) cAMP concentrations were sig… Show more
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