N-acetylcysteine inhibits in vivo nitric oxide production by inducible nitric oxide synthase

被引:76
作者
Bergamini, S
Rota, C
Canali, R
Staffieri, M
Daneri, F
Bini, A
Giovannini, F
Tomasi, A
Iannone, A
机构
[1] Univ Modena & Reggio Emilia, Dept Biomed Sci, I-41100 Modena, Italy
[2] Natl Inst Food & Nutr Res, Rome, Italy
来源
NITRIC OXIDE-BIOLOGY AND CHEMISTRY | 2001年 / 5卷 / 04期
关键词
bacterial lipopolysaccharide; free radical; nitrosyl-hemoglobin; dinitrosyl-iron-dithiolate; complex; electron paramagnetic resonance; N-acetyl-cysteine; nitric oxide synthase;
D O I
10.1006/niox.2001.0356
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
This in vivo study evaluates the effect of N-acetylcysteine (NAC) administration on nitric oxide (NO) production by the inducible form of nitric oxide synthase (iNOS). NO production was induced in the rat by the ip administration of 2 mg/100 g lipopolysaccharide (LPS). This treatment caused: (1) a decrease in body temperature within 90 min, followed by a slow return to normal levels; (2) an increase in plasma levels of urea, nitrite/nitrate, and citrulline; (3) the appearance in blood of nitrosyl-hemoglobin (NO-Hb) and in liver of dinitrosyl-iron-dithiolate complexes (DNIC); and (4) increased expression of iNOS mRNA in peripheral blood mononuclear cells (PBMC). Rat treatment with 15 mg/100 g NAC ip, 30 min before LPS, resulted in a significant decrease in blood NO-Hb levels, plasma nitrite/nitrate and citrulline concentrations, and liver DNIC complexes. PBMC also showed a decreased expression of iNOS mRNA. NAC pretreatment did not modify the increased levels of plasma urea or the hypothermic effect induced by the endotoxin. The administration of NAC following LPS intoxication (15 min prior to sacrifice) did not affect NO-Hb levels. These results demonstrate that NAC administration can modulate the massive NO production induced by LPS. This can be attributed mostly to the inhibitory effect of NAC on one of the events leading to iNOS protein expression. This hypothesis is also supported by the lack of effect of late NAC administration. (C) 2001 Academic Press.
引用
收藏
页码:349 / 360
页数:12
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