Effects of S-nitrosation of hemoglobin on hypoxic pulmonary vasoconstriction and nitric oxide flux.
Effects of S-nitrosation of hemoglobin on hypoxic pulmonary vasoconstriction and nitric oxide flux.
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血红蛋白 S-亚硝化对缺氧肺血管收缩和一氧化氮通量的影响。
DOI:
10.1164/ajrccm.163.5.2007172
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发表时间:
2001
影响因子:
24.7
通讯作者:
Swenson,ER
中科院分区:
文献类型:
--
作者:
Deem,S;Gladwin,MT;Berg,JT;Kerr,ME;Swenson,ER
Free hemoglobin (Hb) augments hypoxic pulmonary vasoconstriction (HPV), ostensibly by scavenging nitric oxide (NO). However, recent evidence suggests that Hb that isS-nitrosated may act as an NO donor and vasodilator. We studied the effects of oxyHb, Hb that is chemically modified to prevent heme binding or oxidation of NO (cyanometHb), and Hb that isS-nitrosated (SNO-Hb and SNO-cyanometHb) on HPV, expired NO (eNO), and perfusateS-nitrosothiol (SNO) concentration in isolated, perfused rabbit lungs. Perfusate containing either 4 μ M oxyHb or SNO-Hb increased normoxic pulmonary artery pressure (Ppa), augmented HPV dramatically, and resulted in an 80% fall in eNO in comparison to perfusion with buffer, whereas 4 μ M cyanometHb or SNO-cynanometHb had no effect on these variables. Excess glutathione (GSH) added to perfusate containing SNO-Hb resulted in a 20 to 40% fall in the perfusate SNO concentration, with a concomitant increase in metHb content, without affecting Ppa, HPV, or eNO. In conclusion, free Hb augments HPV by scavenging NO, an effect that is not prevented byS-nitrosation. NO released from SNO-Hb in the presence of GSH does not produce measurable vascular effects in the lung or changes in eNO because of immediate oxidation and metHb formation.
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影响因子:
4.8
作者:
M. Wolzt;R. Macallister;D. Davis;M. Feelisch;S. Moncada;P. Vallance;A. Hobbs
通讯作者:
A. Hobbs
DOI:
--
发表时间:
1990
期刊:
Acta Physiologica Scandinavica
影响因子:
--
作者:
M. Persson;L. Gustafsson;N. Wiklund;S. Moncada;P. Hedqvist
通讯作者:
P. Hedqvist
影响因子:
9.8
作者:
C. Toothill
通讯作者:
C. Toothill
影响因子:
3.2
作者:
S. Shigetomi;T. Ikari
通讯作者:
T. Ikari
影响因子:
--
作者:
K. Hasunuma;Takashi Yamaguchi;D. Rodman;R. O'Brien;I. Mcmurtry
通讯作者:
I. Mcmurtry