M2 muscarinic receptor agonists produce hypotension and bradycardia when injected into the nucleus tractus solitarii.

M2 muscarinic receptor agonists produce hypotension and bradycardia when injected into the nucleus tractus solitarii.
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当注射到孤束核时,M2 毒蕈碱受体激动剂会产生低血压和心动过缓。

DOI:
10.1016/0006-8993(89)91427-3
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发表时间:
1989
期刊:
影响因子:
2.9
通讯作者:
Sapru,H
Sapru,H
中科院分区:
医学3区
文献类型:
--
作者:
Sundaram,K;Murugaian,J;Watson,M;Sapru,H

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在戊巴比妥钠麻醉大鼠的孤束核(NTS)中间部,双侧微量注射M2受体激动剂顺式甲基二氧戊烷(CD)(0.2~2nmol/部位),但不注射相对选择性的M1受体激动剂(MCN-A343;3nmol/部位),可引起血压(23~52 mm Hg)和心率(16~50次/min)的降低。以前向NTS微量注射选择性竞争性M2受体拮抗剂(AFDX-116;0.8nmoL/部位),但不注射强有力的M1受体拮抗剂(吡伦西平;2nmol/部位),可阻断CD的作用。这些结果表明,NTS中间部的M受体为M2型。
Bilateral microinjections (0.2–2 nmol/site) of a potent M2muscarinic receptor agonist,cis-methyldioxolane (CD), but not those of a relatively selective M1receptor agonist (McN-A343; 3 nmol/site), into the intermediate portion of nucleus tractus solitarii (NTS) of pentobarbital-anesthetized rats elicited a decrease in blood pressure (23–52 mm Hg) and heart rate (16–50 bpm). Previous microinjections of a selective competitive M2receptor antagonist (AFDX-116; 0.8 nmol/site), but not those of a potent selective M1receptor antagonist (pirenzepine; 2 nmol/site), into the NTS blocked the effects of CD. These results indicate that the muscarinic receptors in the intermediate portion of NTS are of M2type.
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