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논문 기본 정보

자료유형
학술저널
저자정보
Lee, Moo-Yeol (Department of Physiology, College of Medicine, Chung-Ang University) Bang, Hyo-Weon (Department of Physiology, College of Medicine, Chung-Ang University) Uhm, Dae-Yong (Department of Physiology, College of Medicine, Chung-Ang University) Rhee, Sang-Don (Department of Physiology, College of Medicine, Chung-Ang University)
저널정보
대한생리학회 대한생리학회지 대한생리학회지 제28권 제2호
발행연도
1994.1
수록면
151 - 157 (7page)

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Intracellular free $Ca^{2+}$ contributes to regulation of various events occurring in vascular smooth muscle cells. One of these events is modulating the membrane iou currents. Single smooth muscle cells were isolated from rabbit mesenteric artery. Three kinds of $Ca^{2+}-activated\;current$ were studied with the patch clamp method. $Ca^{2+}-activated\;K^+\;current$ with a large oscillation was recorded in the depolarized potential range. The single channel conductance of this current was about 250 pS. It was abolished by replacing intracellular $K^+\;with\;Cs^+$. A $Ca^{2+}-activated$ nonselective cation current was observed in both the depolarized and hyperpolarized potential ranges. And it was blocked by replacement of extracellular $Na^+$ with N-methylglucamine (NMG) or extracellular application of $Cd^{2+}$. $Ca^{2+}-activated\;Cl^-\;current$ was revealed in the whole voltage range and was blocked by niflumic acid. These results indicate that at least three kinds of $Ca^{2+}-activated$ ionic currents exist in smooth muscle cells from rabbit superior mesenteric artery.

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