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首页> 外文期刊>Acta Pharmacologica Sinica >Altered α_1-adrenoceptor subtypes mediated cardiac function after treatment of propranolol to rats
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Altered α_1-adrenoceptor subtypes mediated cardiac function after treatment of propranolol to rats

机译:普萘洛尔对大鼠的治疗后α_1肾上腺素受体亚型介导的心脏功能改变

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AIM: To study inotropic and chronotropic effects mediated by α_(1A)-and a_(1B)-adrenoceptors after 5-d propranolol (Pro) treatment. METHODS: The positive inotropic and chronotropic effects mediated by α_(1A) and α_(1B) subtypes were determined on isolated left ventricular papillary muscles and right atrium in Pro- and NaCl-treated rats. RESULTS: The basic contractility of papillary muscles induced by phenylephrine (Phe) was 90 ± 18 mg in Pro-treated rats and 53 ± 17 mg in control group (P<0.05). The increment on force of contraction was 20±12 mg in Pro-pretreated rats and 5±5 mg in NaCl- treated rats (P<0.05). After preincubated with chloroethylclonidine, the increment on force of contraction was reduced in Pro-treated rats, but was not much changed in control group.
机译:目的:研究5-d普萘洛尔(Pro)治疗后由α_(1A)-和a_(1B)-肾上腺素受体介导的正性和变时性作用。方法:确定在Pro和NaCl处理的大鼠中,分离的左心室乳头肌和右心房由α_(1A)和α_(1B)亚型介导的正性变力和变时性作用。结果:苯肾上腺素(Phe)诱导的乳头肌基本收缩力在Pro治疗组为90±18 mg,在对照组为53±17 mg(P <0.05)。 Pro预处理大鼠的收缩力增量为20±12 mg,NaCl处理大鼠的收缩力增量为5±5 mg(P <0.05)。用氯乙基可乐定预孵育后,收缩力的增加在Pro治疗组中降低,但在对照组中变化不大。

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