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Sympathetic regulation of vascular tone via noradrenaline and serotonin in the rat carotid body as revealed by intracellular calcium imaging

机译:细胞内钙显像揭示了大鼠颈动脉中去甲肾上腺素和5-羟色胺对血管紧张度的交感调节

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Hypoxia-induced chemosensory activity in the carotid body (CB) may be enhanced by the sympathetic regulation of vascular tone in the CB. In the present study, we recorded cervical sympathetic nerve activity in rats exposed to hypoxia, and examined noradrenaline (NA)-and serotonin (5-HT)-induced intracellular Ca2+ ([Ca2+](i)) responses in smooth muscle cells and pericytes in isolated blood vessels from the CB. Multifiber electrical activity recorded from the cervical sympathetic trunk was increased during the inhalation of hypoxic gas. NA induced [Ca2+](i) increases in smooth muscle cells in arteriole specimens, whereas 5-HT did not cause any [Ca2+](i) responses. However, NA did not induce [Ca2+](i) increases in pericytes in capillaries, whereas 5-HT did and this response was inhibited by the 5-HT2 receptor antagonist, ketanserin. In conclusion, cervical sympathetic nerves enhanced by hypoxia may reduce blood flow in the CB in order to increase chemosensitivity. Thus, hypoxic chemosensitivity in the CB may involve a positive feedback mechanism via sympathetic nerves. (C) 2014 Elsevier B.V. All rights reserved.
机译:缺氧诱导的颈动脉体(CB)的化学感觉活性可以通过交感神经调节CB中的血管紧张度来增强。在本研究中,我们记录了缺氧大鼠的颈交感神经活动,并检查了去甲肾上腺素(NA)和血清素(5-HT)诱导的平滑肌细胞和周细胞内细胞内Ca2 +([Ca2 +](i))反应从断路器分离出的血管中。吸入低氧气体会增加颈交感神经干记录的多纤维电活动。 NA诱导的[Ca2 +](i)在小动脉标本的平滑肌细胞中增加,而5-HT并未引起任何[Ca2 +](i)响应。但是,NA不会引起毛细血管周细胞中[Ca2 +](i)的增加,而5-HT会引起这种反应,而5-HT2受体拮抗剂ketanserin抑制了这种反应。总之,缺氧增强的宫颈交感神经可能会减少CB中的血流,从而增加化学敏感性。因此,CB中的缺氧化学敏感性可能涉及通过交感神经的正反馈机制。 (C)2014 Elsevier B.V.保留所有权利。

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