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作 者:章汝文[1,2] 沈镀[1,2] 孙巍巍[3] 王杨凯[1] 白洁[2] 袁文俊[1,2] 王伟忠[1]
机构地区:[1]第二军医大学基础部生理学教研室,上海200433 [2]宁夏医科大学基础医院院生理系,银川750004 [3]第二军医大学基础部计算机教研室,上海200433
出 处:《第二军医大学学报》2012年第7期718-720,共3页Academic Journal of Second Military Medical University
基 金:国家自然科学基金(30971061;31100831);第二军医大学青年启动基金(2010QN03)~~
摘 要:目的观察一氧化氮(nitric oxide,NO)在心血管中枢孤束核(NTS)和头端延髓腹外侧区(RVLM)内的心血管作用特点,从而明确其在介导中枢心血管功能调控中的意义。方法采用微量注射的方法观察麻醉SD大鼠NTS和RVLM增加或降低NO后动物血压、心率和肾交感神经活动的变化。结果在麻醉SD大鼠模型上,在心血管反射传入的中继站NTS内微量注射NO前体L-精氨酸(L-Arg,2nmol/50nl)能降低基础血压、心率和肾交感神经活动(P<0.05),而注射NO合酶(NOS)抑制剂NG-硝基-L-精氨酸甲酯(L-NAME,10nmol/50nl)能增加心血管功能(P<0.05)。在交感输出的关键区域RVLM注射L-Arg(2nmol/100nl)能增加血压、心率和交感神经活动(P<0.05),而给予L-NAME(10nmol/100nl)则抑制心血管功能(P<0.05)。结论 NO在不同的心血管中枢中具有不同的作用,提示其多样性效应对维持基础心血管功能具有特定的意义。Objective To observe the effect of nitric oxide(NO)on cardiovascular activities in the nucleus tractus solitarii (NTS) and the rostral ventrolateral medulla (RVLM), so as to understand the role of central NO in cardiovascular regulation. Methods The changes of blood pressure (BP), heart rate (HR), and renal sympathetic nerve activity (RSNA) were observed following treatments with increased or decreased NO in the NTS and RVLM of anaesthetized SD rats. Results Microinjection of the NO precusor L-arginine (L-Arg, 2 nmol in 50 nl) into the NTS, a key relay of cardiovascular reflex transmission, produced significant decreases in BP, HR, and RSNA (P〈0.05), and injection of NO synthase inhibitor NG-nitro-L-arginine methyl ester(I. NAME, 10 nmol in 50 nl) into the NT$ produced significant increases in these cardiovascular parameters (P〈0. 05). However, injection of L-Arg (2 nmol in 100 nl) into the RVLM, a key region controlling sympathetic outflow, significantly increased basal BP, HR, and RSNA (P〈0.05), and injection of L-NAME (10 nmol in 100 nl) into the RVLM showed a cardiovascular inhibition effect (P〈 0. 05). Conclusion NO exhibits different effects in different cardiovascular centers, suggesting that it plays a special role in maintaining the basal cardiovascular activity.
分 类 号:R331.3[医药卫生—人体生理学]
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