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논문 기본 정보

자료유형
학술저널
저자정보
Kim, Jin-Hyuk (Institute of Biomedical Science and College of Medicine, Hanyang University) Koh, Young-Ik (Institute of Biomedical Science and College of Medicine, Hanyang University) Chin, He-Min (Laboratory of Neurochemistry, NINDS, NIH) Lee, Yong-Sung (Institute of Biomedical Science and College of Medicine, Hanyang University) Cho, Yeul-Hee (Institute of Biomedical Science and College of Medicine, Hanyang University) Kim, Kee-Soon (Institute of Biomedical Science and College of Medicine, Hanyang University)
저널정보
대한생리학회 대한생리학회지 대한생리학회지 제29권 제2호
발행연도
1995.1
수록면
301 - 307 (7page)

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To explore electrophysiological properties of the ${\delta}-Opioid$ receptors artificially expressed in the mammalian cell, effect of an opioid agonist DPDPE $(1\;{\mu}M)$ on the voltage-sensitive outward currents was examined in the HEK293 (human embryonic kidney) cells transfected with ${\delta}-Opioid$ receptor cDNA cloned from NG-108-15 $(neuroblastoma\;{\times}\;glioma\;hybrid)$ cDNA library. Also studied were effects of 8-bromo-cyclic AMP and naloxone on DPDPE-induced changes in the voltage sensitive outward current. The voltage sensitive outward currents were recorded using perforated patch technique at room temperature. In the non-transformed HEK293 cells, DPDPE did not alter voltage sensitive outward current, indicating that no native ${\delta}-Opioid$ receptor had been developed. However, $(1\;{\mu}M)$ DPDPE remarkably increased the voltage sensitive outward current in the transformed HEK293 cells. The increment in voltage sensitive outward current peaked in $7{\sim}10\;minutes$ after DPDPE application, and the maximum DPDPE-activated outward current $(313.1{\pm}12.3\;pA)$ was recorded when the membrane potential was depolarized to +70mv. Following pretreatment of the transformed HEK293 cells with 1 mM 8-bromo-cyclic AMP, DPDPE failed to increase the voltage sensitive outward currents. On the other hand, naloxone completely abolished DPDPE-activated voltage sensitive outward current in the transformed HEK293 cells. The results of present study suggest that in the transformed HEK293 cells an activation of the ${\delta}-Opioid$ receptors by an opioid agonist DPDPE increases the voltage-sensitive potassium current as a result of decrement in cyclic AMP level.

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