首页> 外文期刊>Journal of vascular research >Electrophysiological basis of arteriolar vasomotion in vivo.
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Electrophysiological basis of arteriolar vasomotion in vivo.

机译:体内小动脉血管运动的电生理基础。

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We tested the hypothesis that cyclic changes in membrane potential (E(m)) underlie spontaneous vasomotion in cheek pouch arterioles of anesthetized hamsters. Diameter oscillations (approximately 3 min(-1)) were preceded (approximately 3 s) by oscillations in E(m) of smooth muscle cells (SMC) and endothelial cells (EC). Oscillations in E(m) were resolved into six phases: (1) a period (6 +/- 2 s) at the most negative E(m) observed during vasomotion (-46 +/- 2 mV) correlating (r = 0.87, p < 0.01) with time (8 +/- 2 s) at the largest diameter observed during vasomotion (41 +/- 2 microm); (2) a slow depolarization (1.8 +/- 0.2 mV s(-1)) with no diameter change; (3) a fast (9.1 +/- 0.8 mV s(-1)) depolarization (to -28 +/- 2 mV) and constriction; (4) a transient partial repolarization (3-4 mV); (5) a sustained (5 +/- 1 s) depolarization (-28 +/- 2 mV) correlating (r = 0.78, p < 0.01) with time (3 +/- 1 s) at the smallest diameter (27 +/- 2 microm) during vasomotion; (6) a slow repolarization (2.5 +/- 0.2 mV s(-1)) and relaxation. The absolute change in E(m) correlated (r = 0.60, p < 0.01) with the most negative E(m). Sodium nitroprusside or nifedipine caused sustained hyperpolarization and dilation, whereas tetraethylammonium or elevated PO(2) caused sustained depolarization and constriction. We suggest that vasomotion in vivo reflects spontaneous, cyclic changes in E(m) of SMC and EC corresponding with cation fluxes across plasma membranes. Copyright 2000 S. Karger AG, Basel
机译:我们测试了以下假设,即膜电位(E(m))的周期性变化是麻醉仓鼠颊袋小动脉中自发性血管运动的基础。直径振荡(约3 min(-1))先于平滑肌细胞(SMC)和内皮细胞(EC)的E(m)振荡(约3 s)。 E(m)中的振荡被分解为六个阶段:(1)在血管运动(-46 +/- 2 mV)期间观察到的最大负E(m)周期(6 +/- 2 s)(r = 0.87) ,在血管舒张过程中观察到的最大直径处(41 +/- 2微米),随着时间(8 +/- 2 s),p <0.01); (2)无直径变化的缓慢去极化(1.8 +/- 0.2 mV s(-1)); (3)快速去极化(9.1 +/- 0.8 mV s(-1))(至-28 +/- 2 mV)和收缩; (4)瞬时部分复极化(3-4 mV); (5)最小直径(27 +)上的持续(5 +/- 1 s)去极化(-28 +/- 2 mV)与时间(3 +/- 1 s)相关(r = 0.78,p <0.01) /-2微米)。 (6)缓慢的复极化(2.5 +/- 0.2 mV s(-1))和松弛。 E(m)的绝对变化与负E(m)相关(r = 0.60,p <0.01)。硝普钠或硝苯地平钠引起持续的超极化和扩张,而四乙铵或升高的PO(2)引起持续的去极化和收缩。我们建议体内的血管运动反映SMC和EC的E(m)的自发性,周期性变化,与跨质膜的阳离子通量相对应。版权所有2000 S. Karger AG,巴塞尔

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