eNOS protects from atherosclerosis despite relevant superoxide production by the enzyme in apoE mice.
eNOS protects from atherosclerosis despite relevant superoxide production by the enzyme in apoE mice.
复制标题
尽管酶在APOE小鼠中产生了相关的超氧化物,但ENOS仍能保护动脉粥样硬化。
DOI:
10.1371/journal.pone.0030193
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Kuhlencordt PJ
中科院分区:
文献类型:
--
作者:
Ponnuswamy P;Schröttle A;Ostermeier E;Grüner S;Huang PL;Ertl G;Hoffmann U;Nieswandt B;Kuhlencordt PJ
All three nitric oxide synthase (NOS) isoforms are expressed in atherosclerotic plaques. NOS enzymes in general catalyse NO production. However, under conditions of substrate and cofactor deficiency, the enzyme directly catalyse superoxide formation. Considering this alternative chemistry, the effects of NOS on key events in spontaneous hyperlipidemia driven atherosclerosis have not been investigated yet. Here, we evaluate how endothelial nitric oxide synthase (eNOS) modulates leukocyte/endothelial- (L/E) and platelet/endothelial- (P/E) interactions in atherosclerosis and the production of nitric oxide (NO) and superoxide by the enzyme. Intravital microscopy (IVM) of carotid arteries revealed significantly increased L/E-interactions in apolipoproteinE/eNOS double knockout mice (apoE−/−/eNOS−/−), while P/E-interactions did not differ, compared to apoE−/−. eNOS deficiency increased macrophage infiltration in carotid arteries and vascular cell adhesion molecule-1 (VCAM-1) expression, both in endothelial and smooth muscle cells. Despite the expression of other NOS isoforms (inducible NOS, iNOS and neuronal NOS, nNOS) in plaques, Electron Spin Resonance (ESR) measurements of NO showed significant contribution of eNOS to total circulating and vascular wall NO production. Pharmacological inhibition and genetic deletion of eNOS reduced vascular superoxide production, indicating uncoupling of the enzyme in apoE−/− vessels. Overt plaque formation, increased vascular inflammation and L/E- interactions are associated with significant reduction of superoxide production in apoE−/−/eNOS−/− vessels. Therefore, lack of eNOS does not cause an automatic increase in oxidative stress. Uncoupling of eNOS occurs in apoE−/− atherosclerosis but does not negate the enzyme's strong protective effects.
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影响因子:
15.9
作者:
Landmesser, U;Dikalov, S;Harrison, DG
通讯作者:
Harrison, DG
影响因子:
5.5
作者:
Fink, B;Laude, K;Dikalov, S
通讯作者:
Dikalov, S
DOI:
10.1073/pnas.88.11.4651
发表时间:
1991-06-01
影响因子:
11.1
作者:
KUBES, P;SUZUKI, M;GRANGER, DN
通讯作者:
GRANGER, DN
DOI:
10.1152/ajpgi.1994.267.4.g562
发表时间:
1994-10-01
影响因子:
4.5
作者:
GAUTHIER, TW;DAVENPECK, KL;LEFER, AM
通讯作者:
LEFER, AM
影响因子:
15.9
作者:
Knowles, JW;Reddick, RL;Maeda, N
通讯作者:
Maeda, N