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자료유형
학술저널
저자정보
Rhee, Poong-Lyul (Department of Physiology & Biophysics, Seoul National University College of Medicine) Lee, Sang-Jin (Department of Physiology & Biophysics, Seoul National University College of Medicine) Kim, Sung-Joon (Department of Physiology & Biophysics, Seoul National University College of Medicine) So, In-Suk (Department of Physiology & Biophysics, Seoul National University College of Medicine) Hwang, Sang-Ik (Department of Physiology & Biophysics, Seoul National University College of Medicine) Kim, Ki-Whan (Department of Physiology & Biophysics, Seoul National University College of Medicine)
저널정보
대한생리학회 대한생리학회지 대한생리학회지 제27권 제2호
발행연도
1993.1
수록면
139 - 150 (12page)

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We have reported that dopamine potentiates spontaneous contractions dose-dependently in guinea-pig antral circular muscle strips (Hwang et al, 1991). To clarify the underlying excitatory mechanism of dopamine on the gastric smooth muscle, the effects of dopamine on voltage-dependent $Ca^{2+}\;currents\;and\;Ca^{2+}\;-dependent\;K^+\;currents$ were observed in enzymatically dispersed guinea-pig gastric myocytes using the whole-cell voltage-clamp technique. Experiments were also done using isometric tension recording and conventional intracellular microelectrode techniques. 1) The effect of dopamine on the spontaneous contraction of antral circular muscle strips of the guinea-pig was excitatory in a dose-dependent manner, and was blocked by phentolamine, an ${\alpha}-adrenoceptor$ blocker. 2) The slow waves were not changed by dopamine. 3) The voltage-operated inward $Ca^{2+}$ current was not influenced by dopamine. 4) The $Ca^{2+}\;-dependent\;K^+$ outward current, which might reflect the changes of intracellular calcium concentration, was enhanced by dopamine. This effect was abolished by phentolamine. 5) The enhancing effect of dopamine on the $Ca^{2+}\;-dependent\;K^+$ current disappeared with heparin which is known to block the action of $InsP_3$. From these results, it is suggested that dopamine acts via $InsP_3-mediated\;Ca^{2+}$ mobilization from intracellular stores and such action potentiates the spontaneous contraction of guinea-pig gastric smooth muscle.

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