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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 제14권 제3호
- 발행연도
- 1991.1
- 수록면
- 271 - 278 (8page)
이용수
초록· 키워드
오류제보하기
To investigate further whether the effects of the dihydropyridine (DHP) drugs on calcium channels are related to those of these drugs on muscarinic receptors, the binding characteristics of the DHP calcium channel agonist, Bay K 8644, on muscarinic receptors and calcium channels were compared to those of the DHP calcium channel antagonists, nicardipine and nimodipine in the dog cardiac sarcolemma. Bay K 8644, nicardipine and nimodipine inhibited the specific $[^3H]$QNB binding with $K_i$ values of 16.7\mu{M}$, 3.5\mu{M}$ and 15.5\mu{M}$ respectively. Saturation data of $[^3H]$QNB binding with $K_i$ VALUES OF 16.7\mu{M}$ 3.5\mu{M}$ and 15.5\mu{M}$ respectively. Saturation data of $[^3H]$QNB binding in the presence of these DHP drugs showed this inhibition to be competitive. Bay K 8644, like nicardipine and nimodipine, blocked the binding of $[^3H]$nitrendipine to the high affinity DHP binding sites, but atropine did not, indicating that the muscarinic receptors and the DHP binding sites m but atropine did not, indicating that the muscarinic receptors and the DHP bindings sites on calcium channels are distinct. The $K_i$ value of Bay K 8644 for the DHP binding sites was 4nM. Nicardipine and nimodipine $(K_i:0.1-0.2\;nM)$ were at least 20 times more potent than Bay K 8644 in inhibiting $[^3H]$ nitrendipine binding. Thus, the muscarinic receptors were about 4000 times less sensitive than thes high afinity DHP binding sites to Bay K 8644. These results suggest that the DHP calcium agonist Bay K 8644 binds directly to the muscarinic receptors but its interaction with the muscarinic receptors is not related to its binding to the DHP binding sites on calcium channels.
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