Abstract | OBJECTIVE: METHODS: AMs were collected from a silicotic patient by bronchoalveolar lavage, and exposed to SiO(2) (50 microg/ml), and cultured in DMEM without serum for different time (2, 6, 12, 18, 24, 36 h). Immunocytochemical method was used to detect the level of expression of MMP-9 and TIMP-1 in AMs. RESULTS: The expression of MMP-9 in AMs exposed to silica was up-regulated, and reached the peak at 18 h [average optical density: (0.440 +/- 0.021) vs (0.390 +/- 0.011), P < 0.05]. After that, the expression reduced markedly. However, the expression of TIMP-1 of AMs were not significantly different from the control group [average optical density: (0.175 +/- 0.019) vs (0.162 +/- 0.044), P > 0.05]. CONCLUSION: SiO(2) could induce up-expression of MMP-9 in AMs. Degradation of basement membrane by MMP-9 produced by AMs at early stage of lung injury may associate with the immigration of various cells including lung fibroblasts into the injured region.
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Authors | Xiao-bing Ma, Xiu-ling Li, Shu-xun Sun, Fang Yang |
Journal | Zhonghua lao dong wei sheng zhi ye bing za zhi = Zhonghua laodong weisheng zhiyebing zazhi = Chinese journal of industrial hygiene and occupational diseases
(Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi)
Vol. 23
Issue 3
Pg. 203-5
(Jun 2005)
ISSN: 1001-9391 [Print] China |
PMID | 16124900
(Publication Type: English Abstract, Journal Article)
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Chemical References |
- Tissue Inhibitor of Metalloproteinase-1
- Silicon Dioxide
- Matrix Metalloproteinase 9
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Topics |
- Bronchoalveolar Lavage Fluid
(cytology)
- Cells, Cultured
- Humans
- Immunohistochemistry
- Macrophages, Alveolar
(drug effects, metabolism)
- Male
- Matrix Metalloproteinase 9
(biosynthesis)
- Middle Aged
- Silicon Dioxide
(pharmacology)
- Silicosis
(pathology)
- Tissue Inhibitor of Metalloproteinase-1
(biosynthesis)
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