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  • Title: [Effects of high-dose N-acetylcysteine on the lung tissues of rats exposed to silica].
    Author: Zhang H, Zhang CL.
    Journal: Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi; 2011 Jul; 29(7):510-3. PubMed ID: 22214156.
    Abstract:
    OBJECTIVE: To explore the effects of high-dose N-acetylcysteine on the lung tissues of rats exposed to silica. METHODS: Ninety-six Wistar rats were randomly divided into model group, intervention group and control group (32 rats for each group). The rats of model group and intervention group were exposed to silica by intratracheal infusion of silica dust suspension. The rats in the intervention group were orally given high dose N-acetylcysteine. In 3, 7, 14, 28 days after exposure, eight rats in each group were sacrificed, respectively and the lung samples were collected. The pathological changes of lung were evaluated by HE and Masson staining methods. The levels of TNF-alpha and IL-8 in the BALF were detected by ELISA. RESULTS: Compared with the control group, the alveolitis and pulmonary fibrosis in the intervention group were significantly reduced. In 3, 7, 14, 28 days after exposure, the lung/body coefficients in the intervention group were 9.30 +/- 0.78, 6.29 +/- 0.74, 7.63 +/- 0.88, 6.06 +/- 1.16 respectively, which were significantly lower than those (13.84 +/- 1.61, 9.23 +/- 0.87, 11.23 +/- 1.25, 9.56 +/- 0.76, P < 0.01 ) in the model group (P < 0.01). At the different time points, the levels of TNF-alpha and IL-8 in the BALF in the intervention group were significantly higher than those in the control group (P < 0.01), but were significantly lower than those in the model group (P < 0.01). CONCLUSION: The intervention with high dose N-acetylcysteine can significantly reduce the alveolitis and the TNF-alpha and IL-8 levels in the BALF, therefore, inhibit and delay the development of pulmonary fibrosis of rats exposed to silicon dioxide.
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