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논문 기본 정보

자료유형
학술저널
저자정보
Han, Jin (Department of Physiology and Biophysics, College of Medicine, Inje University) Leem, Chae-Hun (Department of Physiology and Biophysics, College of Medicine, Seoul National University) Ahn, Chul-Soo (Department of Physiology and Biophysics, College of Medicine, Dankuk University) So, In-Suk (Department of Physiology and Biophysics, College of Medicine, Seoul National University) Kim, Eui-Yong (Department of Physiology and Biophysics, College of Medicine, Inje University) Ho, Won-Kyung (Department of Physiology and Biophysics, College of Medicine, Seoul National University) Earm, Yung-E (Department of Physiology and Biophysics, College of Medicine, Seoul National University)
저널정보
대한생리학회 대한생리학회지 대한생리학회지 제27권 제2호
발행연도
1993.1
수록면
151 - 162 (12page)

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In order to investigate the effect of intracellular cyclic GMP on calcium current the whole-cell patch clamp technique with internal perfusion method was used in isolated ventricular myocytes of the rabbit. Cyclic GMP, 8-bromo-cyclic GMP, cyclic AMP, isoprenaline and forskolin were perfused into cells and their effects on calcium current were analysed by applying depolarizing step pulses of + 10 mV in amplitude far 300 msec from holding potential of - 40 mV. Not only cyclic AMP $(100\;{\mu}M)$ but also cyclic GMF $(100\;{\mu}M)$ increased the basal calcium current. 8-Bromo-cyclic GMP $(100\;{\mu}M)$, a good stimulator of the cyclic GMP-dependent protein kinase, also increased the basal calcium current and its peak amplitude of calcium current was larger than that in the presence of cyclic AMP or cyclic GMP alone. In the presence of $100\;{\mu}M$ cyclic GMP or $100\;{\mu}M$ 8-bromo-cyclic GMP, already augmented calcium current was potentiated by intracellular application of $100\;{\mu}M$ cyclic AMP or $1\;{\mu}M$ isoprenaline or $1\;{\mu}M$ forskolin. In the presence of cyclic GMP, acetylcholine reduced the calcium current only when the calcium current was increased by isoprenaline. From the above results it could be concluded that intracellular perfusion with cyclic GMP increases the basal calcium current via a mechanism involving a cyclic GMP-dependent protein kinase.

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