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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 대한약학회 Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea 제17권 제6호
- 발행연도
- 1994.1
- 수록면
- 443 - 451 (9page)
이용수
초록· 키워드
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The binding characteristics of pirenzepine and oxomemazine to muscarinic receptor were studied to evaluate the selectivity of oxomemazine for the muscarinic receptor subtypes in rat cerebral microsomes. Equililbrium dissociation constant $(K_D){\;}of{\;}(-)[^3H]$quinuclidinyl benzilate$([^3H)QNB)$ determined from saturation isotherms was 64-pM. Analysis of the pirenzepine inghibition curve of [$^3H$]QNB binding to cerebral microsome indicatd the presence of two receptor subtypes with high $(K_1 = 16 nM, M_1 receptor)$two receptor subypes with about 20-fold difference in the affinity for high $(k_1 = 84nM, {\;} O_H receptor){\;} and {\;}low{\;} (K_1{\;} ={\;} 1.65\muM, {\;} O_L receptor$) affinity sites. The percentage populations of $M_1{\;} and M_3$, receptors to the total receptors were 61 : 39, and those of $O_H{\;} and{\;} O_L$ receptors 39 : 61, resepectively. Both pirenzepine and oxomemazine increaed the $K_D$ value for $[^3H]QNB$ without affecting the binding site concentrations and Hii coefficient for the $[^3H]QNB$ without affecting the binding site concentractions and Hill coefficient for the [$^{3}$H]QNB binding. Oxomemazine had a 10-fold higher affinity at $M_1$ receptors than at $M_3$ receptors, and pirenzepine a 8-fold higher affinity at $O_H$ receptors were of $O_H$ receptors and 71% of $M_3$ receptors. However, $M_3$for oxomemazine and $O_H$for pirenzepine were composed of a uniform population. These results suggest that oxomemazine could be classified as a selective drug for $M_1$ receptors and also demonstrate that rat cerebral microsomes contain three different subtypes of $M_1{\;} M_3$ and the other site which is different from $M_1, {\;} M_2$, receptors.
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