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논문 기본 정보

자료유형
학술저널
저자정보
Haan, Jae-Hee (Department of Physiology, Gyeongsang National University College of Medicine) Cho, Soo-Wan (Department of Physiology, Gyeongsang National University College of Medicine) Yang, Young-Sun (Department of Physiology, Gyeongsang National University College of Medicine) Park, Young-Geun (Department of Physiology, Gyeongsang National University College of Medicine) Park, Hong-Gi (Department of Physiology, Gyeongsang National University College of Medicine) Chang, Gyeong-Jae (Department of Physiology, Gyeongsang National University College of Medicine) Kim, Yang-Mi (Department of Physiology, Gyeongsang National University College of Medicine) Park, Choon-Ok (Department of Physiology, Gyeongsang National University College of Medicine) Hong, Seong-Geun (Department of Physiology, Gyeongsang National University College of Medicine)
저널정보
대한생리학회 대한생리학회지 대한생리학회지 제28권 제2호
발행연도
1994.1
수록면
215 - 224 (10page)

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초록· 키워드

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The presence of a calcium current $(i_{Ca^{2+}})$ passed via a specific channel was examined in the unfertilized hamster egg using the whole-cell voltage clamp technique. Pure inward current was isolated using a $Ca^{2+}-rich$ pipette solution containing 10 mM TEA. This current was independent of external $Na^+$ and was highly sensitive to the $Ca^{2+}$ concentration in the bathing solution, indicating that the inward current is carried by $Ca^{2+}$. The maximal amplitude was $-4.12{\pm}0.58nA\;(n=12)$ with 10mM $Ca^{2+}$ at -3OmV from a holding potential of -8OmV. This current reached its maximum within 20ms beyond -3OmV and decayed rapidly with an inactivation time constant $({\tau})$ of 15ms. Activation and inactivation of this $i_{Ca^{2+}}$ was steeply dependent on the membrane potential. The $i_{Ca^{2+}}$ began to activate at the lower voltage of -55 mV and reached its peak at -35 mV, being completely inactivated at potentials more positive than -40 mV. These result suggest that $i_{Ca^{2+}}$ in hamster eggs passes through channels with electrical properties similar to low voltage-activated T-type channels. Other results from the present study support this suggestion; First, the inhibitory effect of $Ni^{2+}\;(IC_{50}=13.7\;{\mu}M)$ was more potent than $Cd^{2+}\;(IC_{50}=123\;{\mu}M)$. Second, $Ba^{2+}$ conductance was equal to or below that of $Ca^{2+}$. Third, $i_{Ca^{2+}}$ in hamster eggs was relatively insensitive to nifedipine $(IC_{50}=96.6\;{\mu}M)$, known to be a specific t-type blocker. The physiological role of $i_{Ca^{2+}}$ in the unfertilized hamster eggs remains unclear. Analysis from steady-state inactivation activation curves reveals that only a small amount of this current will pass in the voltage range $(-70{\sim}-30\;mV)$ which partially overlaps with the resting membrane potential. This current has the property that it can be easily activated by a weak depolarization, thus it may trigger a certain kind of a intracellular event following fertilization which may cause oscillations in the membrane potential.

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