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- W2371391432 abstract "Objective To investigate the effect of the inhibitor SB203580 of p38 mitogen-activated protein kinase (MAPK) signal transduction pathway on biopterin (BH 4)/nitric oxide (NO) expression and elucidate the potential mechanism of MAPK in biopterin-mediated NO induction after endotoxic shock. Methods A total of 56 male Wistar rats were randomly divided into normal control group (n=8), endotoxic shock group (n=32) and SB203580 treatment group (n=16). After animals were sacrificed, tissue samples from the liver, the lungs as well as the kidneys were harvested to determine the expressions of guanosine triphosphate cyclohydrolase I (GTP-CHI) and inducible nitric oxide synthase (iNOS) mRNA and observe the changes of BH 4 and NO levels in blood and tissues. Results With endotoxin challenge, GTP-CHI mRNA expression and BH 4 levels were significantly elevated in various tissues and maintained at high levels up to 24 hours. Similarly, the iNOS mRNA expression and NO levels in the tissues significantly increased too, especially in the liver and the lungs. Treatment with SB203580 significantly down-regulated GTP-CHI mRNA expression in the liver, the lungs and the kidneys at 12, 24 and 2-12 hours, respectively (P0.05 or P0.01). In the meantime, BH 4 level in the liver reduced significantly at the 12th hour (P0.05). In addition, iNOS mRNA expression in the liver, the lungs and the kidneys was significantly decreased at various degrees (P0.05 or P0.01). NO contents in the liver and the lungs were also markedly reduced. Conclusion p38 MAPK signal transduction may be involved in the pathological process of endotoxin-mediated BH 4 induction. Therefore, inhibition of p38 MAPK pathway can markedly down-regulate the expression of BH 4 /NO in rats with endotoxic shock." @default.
- W2371391432 created "2016-06-24" @default.
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- W2371391432 date "2004-01-01" @default.
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- W2371391432 title "Role and significance of p38 mitogen-activated protein kinase signal transduction pathway in biopterin induction in rats with endotoxic shock" @default.
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