Role of nitric oxide in hypoxic hypometabolism in rats.

Role of nitric oxide in hypoxic hypometabolism in rats.
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一氧化氮在大鼠缺氧代谢低下中的作用。

DOI:
--
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发表时间:
1999
影响因子:
3.3
通讯作者:
C. Murariu
C. Murariu
中科院分区:
医学2区
文献类型:
--
作者:
H. Gautier;C. Murariu

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因为最近有人提出一氧化氮 (NO) 可能介导缺氧对体温和通气的影响,本研究旨在更全面地评估神经元 NO 合酶抑制剂(7-硝基吲唑,25 mg/kg ip)在环境温度 26 和 15 摄氏度下对环境缺氧(分数激发)引起的通气(V)、代谢(O(2) 消耗)和热变化(结肠和尾部温度)的影响在未麻醉的完整成年大鼠中,O(2) 为 11%)或 CO 缺氧(分数吸入 CO 为 0.07%)。在两种环境温度下,7-硝基吲唑均可降低耗氧量、结肠温度和含氧量正常的 V。该药物减少了环境或二氧化碳缺氧引起的代谢减退和通气反应,但体温过低持续存在。结论:神经NO合酶产生的NO在常氧代谢和V的控制中发挥着重要作用。此外,它还部分介导低氧代谢和通气反应。结果与中枢神经系统缺氧通过减少大脑 NO 重置体温调节设定点的观点一致。
Because it has been recently suggested that nitric oxide (NO) may mediate the effects of hypoxia on body temperature and ventilation, the present study was designed to assess more completely the effects of a neuronal NO synthase inhibitor (7-nitroindazole, 25 mg/kg ip), at ambient temperature of 26 and 15 degrees C, on the ventilatory (V), metabolic (O(2) consumption), and thermal changes (colonic and tail temperatures) induced by ambient hypoxia (fractional inspired O(2) of 11%) or CO hypoxia (fractional inspired CO of 0.07%) in intact, unanesthetized adult rats. At both ambient temperatures, 7-nitroindazole decreased oxygen consumption, colonic temperature, and V in normoxia. The drug reduced ambient or CO hypoxia-induced hypometabolism and ventilatory response, but the hypothermia persisted. It is concluded that NO arising from neural NO synthase plays an important role in the control of metabolism and V in normoxia. As well, it mediates, in part, the hypometabolic and the ventilatory response to hypoxia. The results are consistent with the notion that central nervous system hypoxia resets the thermoregulatory set point by decreasing brain NO.
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