title: Ca2+ ionophore A23187-induced rise in cytoplasmic free calcium and iodide discharge in porcine thyroid cells: measurement of cytoplasmic free calcium by aequorin.
abstract: The cytoplasmic concentration of free calcium was measured using aequorin, a calcium-sensitive photoprotein. The Ca2+ ionophore A23187 induced a rise in cytoplasmic free calcium and iodide discharge in cultured porcine thyroid cells. The minimum dose of A23187 effecting an increase in cytoplasmic free calcium induced iodide discharge. The A23187-induced rise in cytoplasmic free calcium was followed by iodide discharge. The results indicate that A23187-induced iodide discharge is mediated by a rise in the cytoplasmic concentration of free calcium.
mesh_terms: D000331:Aequorin / Q000378:metabolism; D000818:Animals; D000001:Calcimycin / Q000494:pharmacology*; D002118:Calcium / Q000378:metabolism*; D002478:Cells, Cultured; D003593:Cytoplasm / Q000378:metabolism*; D007454:Iodides / Q000378:metabolism*; D013552:Swine; D013961:Thyroid Gland / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*
chemical_list: D007454:Iodides; D000001:Calcimycin; D000331:Aequorin; D002118:Calcium