Response of descending vasa recta to luminal pressure.
Response of descending vasa recta to luminal pressure.
复制标题
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:
影响因子:
--
通讯作者:
Pallone,ThomasL
中科院分区:
文献类型:
--
作者:
Zhang,Zhong;Pallone,ThomasL
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.
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DOI:
--
发表时间:
1980
期刊:
Journal of Comparative and Physiological Psychology
影响因子:
--
作者:
G. H. Nowlis;M. Frank;C. Pfaffmann
通讯作者:
C. Pfaffmann
影响因子:
4.1
作者:
BOLAND, FJ;MELLOR, CS;REVUSKY, S
通讯作者:
REVUSKY, S
影响因子:
56.9
作者:
GRILL, HJ;NORGREN, R
通讯作者:
NORGREN, R
影响因子:
1.9
作者:
Kiefer,SW;Morrow,NS;Metzler,CW
通讯作者:
Metzler,CW
影响因子:
5.2
作者:
P. Nathan
通讯作者:
P. Nathan