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• W3047414186 abstract "The overexpression of inducible nitric oxide synthase (iNOS) induces cell apoptosis through various signal transduction pathways and aggravates lung injury. Caspase‑3 is an important protein in the apoptotic pathway and its activation can exacerbate apoptosis. Simvastatin, a hydroxymethyl glutaryl‑A reductase inhibitor, protects against smoke inhalation injury by inhibiting the synthesis and release of inflammatory factors and decreasing cell apoptosis. Following the establishment of an animal model of smoke inhalation injury, lung tissue and serum were collected at different time points and the protein and mRNA expression of iNOS and caspase‑3 in lung tissue by immunochemistry, western blot and reverse transcription‑quantitative polymerase chain reaction, the malondialdehyde (MDA) content and superoxide dismutase (SOD) activity in lung tissue and serum were analyzed using thiobarbituric acid method and the WST‑1 method. The results were statistically analyzed. The lung tissues of the rats in the saline group and the low‑, middle‑ and high‑dose groups exhibited clear edema and hemorrhage, and had significantly higher pathological scores at the various time points compared with the rats in the control group (P<0.05). Furthermore, lung tissue and serum samples obtained from these four groups had significantly higher mRNA and protein expression levels of iNOS and caspase‑3 (P<0.05), significantly lower SOD activity and higher MDA content (P<0.05). Compared with the saline group, the low‑, middle‑ and high‑dose groups had significantly lower pathological scores (P<0.05), significantly lower mRNA and protein expression levels of iNOS, caspase‑3 and MDA content in lung tissues (P<0.05) and significantly higher SOD activity in lung tissues and serum. The middle‑ and high‑dose groups had significantly lower pathological scores (P<0.05), significantly decreased iNOS and caspase‑3 mRNA and protein expression in lung tissues, significantly higher SOD activity in lung tissues and serum and a significantly lower MDA content (P<0.05) compared with the low‑dose group. With the exception of SOD activity in lung tissues at 24 and 72 h and MDA content in serum at 48 h, no significant differences were observed between the middle‑ and high‑dose groups. The present study demonstrated that there was an association between the therapeutic effect and dosage of simvastatin within a definitive range. In rats with smoke inhalation injury, simvastatin inhibited iNOS and caspase‑3 expression in lung tissues and mitigated oxidative stress, thereby exerting a protective effect. In addition, the effect and dose were associated within a definitive range." @default.
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• W3047414186 date "2020-08-04" @default.
• W3047414186 modified "2023-10-06" @default.
• W3047414186 title "Effects of simvastatin on iNOS and caspase‑3 levels and oxidative stress following smoke inhalation injury" @default.
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• W3047414186 doi "https://doi.org/10.3892/mmr.2020.11413" @default.
• W3047414186 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7453554" @default.
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