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J. Biol. Chem., Vol. 263, Issue 17, 8058-8065, Jun, 1988
K Furukawa, Y Tawada and M Shigekawa
Department of Molecular Physiology, National Cardiovascular Center Research Institute, Osaka, Japan.
We investigated the mechanisms of Ca2+ extrusion from cultured rat aortic smooth muscle cells while monitoring changes in the cytosolic Ca2+ concentration ([Ca2+]i) using fura 2 fluorescence. 45Ca2+ efflux from these cells consisted of two major mechanisms; one was dependent on the extracellular sodium concentration (Na+o) and the other was independent of Na+o. Na+o-dependent efflux increased monotonically with increasing [Ca2+]i between 0.1 and 1.0 microM, whereas Na+o-independent efflux reached a plateau at 0.6-1 microM [Ca2+]i with a half-maximum obtained at about 0.16 microM. At [Ca2+]i below 1 microM, the latter was significantly greater than the former. Unlike the Na+o-dependent mechanism, Na+o-independent 45Ca2+ efflux was inhibited almost entirely by extracellularly added La3+ or a combination of high extracellular pH (pH 8.8) and 20 mM Mg2+. It was also inhibited, although not completely, by compound 48/80, a calmodulin antagonist, and vanadate. These results strongly suggest that Na+o-dependent and Na+o-independent 45Ca2+ effluxes occur via the Na+/Ca2+ exchanger and the ATP-dependent Ca2+ pump, respectively. Sodium nitroprusside and atrial natriuretic factor, which are agents that stimulate intracellular production of cGMP, and 8-BrcGMP significantly accelerated the Na+o-independent 45Ca2+ efflux especially at low [Ca2+]i. Forskolin, dibutyryl cAMP, and 8-Br-cAMP, however, showed no stimulation. These results suggest that the plasma membrane Ca2+ pump is regulated by cGMP but not by cAMP in intact vascular smooth muscle cells.
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