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Sex difference in norepinephrine surge in response to psychological stress through nitric oxide in rats.

机译:大鼠因一氧化氮对心理压力的反应而去甲肾上腺素激增的性别差异。

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Psychological stress elevates blood pressure through sympathetic nerve activation. This pressor response is supposedly associated with cardiovascular events. We investigated a sex difference in the pressor response and norepinephrine surge to cage-switch stress in rats. Wistar male and female rats were catheterized for blood pressure monitoring and blood sampling. Six days post-surgery, the rats were exposed to the cage-switch stress and blood samples were collected at rest and 30 min after the start of the stress. The stress-induced pressor response was greater in the male than in the female rats. The stress significantly increased the norepinephrine level in the male, but not in the female rats. Pre-treatment with N(G)-nitro-l-arginine methyl ester (L-NAME), a nitric oxide (NO) synthase inhibitor, attenuated the norepinephrine response significantly in the male rats. There was no sex difference in the endothelial NO synthase expression in the gastrocnemius muscle. However the phosphorylation at serine 1177, a marker for eNOS activation, was higher in the male than in the female rats. These results suggest that NO is involved in the norepinephrine surge to psychological stress in the male rats, but not in the female rats. This is the first report on a sex difference in the norepinephrine surge in response to psychological stress through NO, in association with pressor response.
机译:心理压力会通过交感神经激活而使血压升高。据认为,这种升压反应与心血管事件有关。我们调查了大鼠的升压反应和去甲肾上腺素激增对笼切换压力的性别差异。将Wistar雄性和雌性大鼠插入导管以进行血压监测和血液采样。手术后六天,将大鼠暴露于笼切换应力,并在静息时和应力开始后30分钟收集血样。雄性大鼠的应激诱导的升压反应大于雌性大鼠。压力显着增加了雄性大鼠的去甲肾上腺素水平,但雌性大鼠却没有。一氧化氮(NO)合酶抑制剂N(G)-硝基-1-精氨酸甲酯(L-NAME)预处理可明显减弱雄性大鼠的去甲肾上腺素反应。腓肠肌的内皮一氧化氮合酶表达没有性别差异。但是,雄性大鼠的eNOS激活标记丝氨酸1177处的磷酸化高于雌性大鼠。这些结果表明,NO在雄性大鼠中不参与去甲肾上腺素对心理压力的激增,但在雌性大鼠中不参与。这是关于通过NO与压力反应相关的精神压力引起的去甲肾上腺素激增中性别差异的首次报道。

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