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논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 1994.1
- 수록면
- 305 - 305 (1page)
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초록· 키워드
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It has been shown that there are several subtypes of $\kappa$ opioid receptor, We have evaluated the properties of non-${\mu}$, non-$\delta$ binding of 〔$^3$H〕DIP, a nonselective opioid antagonist, in rat cortex membranes. Binding to ${\mu}$ and $\delta$ sites was inhibited by the use of an excess of competing selective agonists (DAMGO, DPDPE) for these sites. (-)Ethylketocyclazocine(EKC) inhibited 〔$^3$H〕DIP binding with Ki. of 70 nM. However, arylacetamides (U69593 and U50488H) gave little inhibition. Also, we have examined the opioid modulation of K$\^$+/(30 mM)-induced histamine release in rat frontal cortex slices labeled with 1-〔$^3$H〕histidine. The 〔$^3$H〕histamine release from cortex slices was inhibited by EKC, a $\kappa$$_1$-and $\kappa$$_2$-agonist, in a concentration-dependent manner(10 to 10,000 nM). The IC$\sub$50/ of EKC was 107 ${\pm}$ 6 nM. However, the $\delta$ receptor selective agonists, DPDPE and deltorphine II, ${\mu}$ receptor agonists, DAMGO and TAPS, $\kappa$$_1$-agonists, U69593 and U50488H, and $\varepsilon$-agonist, ${\beta}$-endorphin, did not inhibit histamine release even in micromoiar dose, indicating that ${\mu}$, $\delta$ or $\kappa$$_1$ receptors are not involved. The concentration-response curve of EKC was shifted to right in the presence of naloxone (300 nM), a ${\mu}$ preferential antagonist, norbinaltorphimine(300 nM), a $\kappa$$_1$ preferential antagonist and bremazocine(1 nM), a $\kappa$$_1$-agonist and $\kappa$$_2$-antagonist. These results suggest that $\kappa$$_2$ opioid receptor regulates histamine release in the frontal cortex of the rat.
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