Response of descending vasa recta to luminal pressure.

Response of descending vasa recta to luminal pressure.
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降直血管对管腔压力的反应。

DOI:
10.1152/ajprenal.00394.2003
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发表时间:
2004
期刊:
American journal of physiology. Renal physiology
影响因子:
--
通讯作者:
Pallone,ThomasL
Pallone,ThomasL
中科院分区:
--
文献类型:
--
作者:
Zhang,Zhong;Pallone,ThomasL

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我们测试了管腔灌注和加压是否诱导下行直小血管(DVR)中内皮细胞胞质Ca 2+([Ca 2 +]CYT)反应。将从大鼠外髓质分离的DVR插管并进行自由流微灌注(5 nl/min);其开始将[Ca 2 +] CYP从基线76 ± 13增加至221 ± 65 nM。在停流实验中,管腔压力从0到45 mmHg的梯度增加诱导[Ca 2 +] CYP从基线74 ± 24 nM平行增加到45 mmHg时的194 ± 33 nM,在压力>25 mmHg时[Ca 2 +] CYP趋于平稳。细胞外Ca 2+的去除和La 3+(10 μM)或SKF-96365(100 μM)的阻断消除了反应。管腔加压至25 mmHg增加了一氧化氮(NO)的产生,这是一种被NO合酶抑制或细胞外Ca 2+清除所阻断的反应。NO的产生不受超氧化物歧化酶模拟物tempol的影响。我们的结论是,DVR内皮细胞是机械敏感的,并通过升高[Ca 2 +] CYP和产生NO对管腔压力作出反应。这种反应可能增加髓质灌注和唾液分泌。
We tested whether luminal perfusion and pressurization induce an endothelial cytoplasmic Ca2+([Ca2+]CYT) response in descending vasa recta (DVR). DVR isolated from the rat outer medulla were cannulated and subjected to free-flow microperfusion (5 nl/min); the onset of which increased [Ca2+]CYTfrom a baseline of 76 ± 13 to 221 ± 65 nM. A graded increase in luminal pressure from 0 to 45 mmHg in stopped-flow experiments induced a parallel increase in [Ca2+]CYTfrom a baseline of 74 ± 24 to 194 ± 33 nM at 45 mmHg, with a tendency for [Ca2+]CYTto plateau at pressures >25 mmHg. The removal of extracellular Ca2+and blockade by either La3+(10 μM) or SKF-96365 (100 μM) eliminated the response. Luminal pressurization to 25 mmHg increased nitric oxide (NO) generation, a response blocked by NO synthase inhibition or removal of extracellular Ca2+. The NO generation was not affected by the superoxide dismutase mimetic tempol. We conclude that DVR endothelia are mechanosensitive and respond to luminal pressure by elevating [Ca2+]CYTand generating NO. That response might augment medullary perfusion and saliuresis.
仓鼠和大鼠对味觉品质的后天厌恶的特异性。
DOI: --
发表时间: 1980
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