Abstract
BAY-K-8644, a calcium channel agonist, induces a rise in cytoplasmic free calcium and iodide discharge in cultured porcine thyroid cells. The cytoplasmic free calcium concentration, [Ca 2+]i, was measured using aequorin, a calcium-sensitive photoprotein. BAY-K-8644, a dihydropyridine derivative, acts as a Ca channel agonist and induces a rise in [Ca 2+]i and iodide discharge; 0.5 nM BAY-K-8644 is a minimal dose to effect a rise in [Ca 2+]i and iodide discharge and 50 nM BAY-K-8644 produces the maximal effect. The data indicate that BAY-K-8644-induced iodide discharge is mediated by a rise in [Ca 2+]i.
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