Vagal neuroeffector mechanisms affecting transpulmonary pressure in the intact rat.

Vagal neuroeffector mechanisms affecting transpulmonary pressure in the intact rat.
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迷走神经效应机制影响完整大鼠的跨肺压。

DOI:
10.1152/jappl.1995.79.4.1233
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发表时间:
1995
期刊:
Journal of applied physiology (Bethesda, Md. : 1985)
影响因子:
--
通讯作者:
Schultz,HD
Schultz,HD
中科院分区:
--
文献类型:
--
作者:
Haselton,JR;Reynolds,AY;Schultz,HD

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用氯醛糖-乌拉坦麻醉的大鼠进行实验以评估1)双侧刺激颈迷走神经和2)拟副交感神经和拟交感神经药物的作用。使用跨肺压(Ptp)作为气道平滑肌张力的指标,并使用吸气Ptp峰值(Ptppeak)值进行反应比较。在未处理的动物中,迷走神经刺激引起Ptppeak增加155%。将迷走神经冷却至15 ° C,则Ptppeak对迷走神经刺激的反应消失。虽然异丙肾上腺素(1-10微克/公斤静脉注射)不改变静息时的Ptppeak,但可防止迷走神经刺激引起Ptppeak升高。纳多洛尔(1.5 mg/kg i. v.)增强了由迷走神经刺激引起的Ptppeak的增加。在给予纳多洛尔和阿托品或联合给予纳多洛尔、阿托品和5-羟色胺气雾剂或前列腺素F2 α后,迷走神经刺激未引起Ptppeak的任何变化。在实验前1周用辣椒素预处理的大鼠中,迷走神经刺激诱发Ptppeak的增加,与未处理的对照动物相比没有统计学差异。因此,非肾上腺素能非胆碱能系统似乎没有发挥独立的作用,在气道的迷走神经的激活的反应。
Experiments were conducted with chloralose-urethan anesthetized rats to assess the effects of 1) bilateral stimulation of the cervical vagus nerves and 2) parasympathomimetic and sympathomimetic agents. Transpulmonary pressure (Ptp) was used as an index of airway smooth muscle tone, and peak inspiratory Ptp (Ptppeak) values were used for a comparison of responses. In untreated animals, vagal stimulation elicited an increase in Ptppeak of 155%. Cooling of the vagus nerves to 15 degrees C abolished the response of Ptppeak to vagal stimulation. Although isoproterenol (1–10 micrograms/kg i.v.) did not alter resting Ptppeak, it did prevent vagal stimulation from evoking an increase in Ptppeak. Nadolol (1.5 mg/kg i.v.) augmented the increase in Ptppeak elicited by vagal stimulation. Vagal stimulation did not evoke any change in Ptppeak after the administration of both nadolol and atropine or after combined administration of nadolol, atropine, and either serotonin aerosol or prostaglandin F2 alpha. In rats pretreated with capsaicin 1 wk before the experiment, vagal stimulation evoked an increase in Ptppeak that was not statistically different from that of untreated control animals. Therefore, nonadrenergic noncholinergic systems did not appear to play an independent role in the response of the airways to the activation of the vagus nerves.
麻醉剂量的戊巴比妥拮抗大鼠脊髓和大脑皮层中 P 物质或卡巴胆碱诱导的磷脂酰肌醇水解。
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