首页> 美国卫生研究院文献>The Journal of Physiology >Ionic mechanisms in spontaneous vasomotion of the rat basilar artery in vivo.
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Ionic mechanisms in spontaneous vasomotion of the rat basilar artery in vivo.

机译:大鼠基底动脉在体内自发血管运动的离子机制。

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摘要

1. The goal of this study was to examine ionic mechanisms that modulate spontaneous rhythmic changes in vascular calibre or 'vasomotion' in the basilar artery in vivo. 2. Diameter of the basilar artery was measured through a craniotomy in anaesthetized rats under control conditions and during topical application of antagonists or alteration in the ionic composition of artificial cerebrospinal fluid (CSF). 3. Both Ca2(+)-free CSF and the Ca2+ channel blocker, nimodipine, produced moderate dilatation of the basilar artery and abolished vasomotion. Increasing the concentration of Ca2+ in CSF from 1.7 to 5.0 mM did not affect the frequency of vasomotion, although the amplitude was increased slightly. 4. Both K(+)-free CSF and ouabain produced mild to moderate vasoconstriction and abolished vasomotion. In contrast, increasing the concentration of K+ in CSF produced vasodilatation of the basilar artery and decreased or abolished vasomotion depending on the degree of vasodilatation. 5. Tetrodotoxin had no effect on vasomotion. 6. These results suggest that vasomotion of the basilar artery in vivo is dependent on extracellular Ca2+ and K+, and on the activity of Na(+)-K(+)-ATPase, and not dependent on Na+ channel.
机译:1.这项研究的目的是研究调节体内基底动脉自发性节律变化或“血管运动”的离子机制。 2.在控制条件下和局部应用拮抗剂或人工脑脊液(CSF)离子组成改变的情况下,通过开颅手术在麻醉的大鼠中测量基底动脉的直径。 3.不含Ca2(+)的CSF和Ca2 +通道阻滞剂尼莫地平均对基底动脉产生中等程度的扩张,并消除了血管运动。 CaSF中的Ca2 +浓度从1.7增加到5.0 mM并没有影响血管运动的频率,尽管幅度略有增加。 4.不含K(+)的CSF和ouabain均产生轻度至中度的血管收缩,并消除了血管运动。相反,增加CSF中的K +浓度会导致基底动脉血管舒张,而血管舒张程度则取决于血管舒张程度而降低或取消。 5.河豚毒素对血管运动没有影响。 6.这些结果表明,体内基底动脉的血管运动取决于细胞外Ca2 +和K +,以及Na(+)-K(+)-ATPase的活性,而不取决于Na +通道。

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