[Effects of matrix metallopeptidase 9 on the proliferation, apoptosis, type I and III procollagen synthesis of rat dermal fibroblasts].

Authors: Lin, DZ  Yang, C  Chen, LH  Ren, M  Zhu, P  Xue, SN  Yan, L 
Citation: Lin DZ, etal., Zhonghua Yi Xue Za Zhi. 2012 Feb 28;92(8):564-7.
Pubmed: (View Article at PubMed) PMID:22490164

OBJECTIVE: To explore the effects of matrix metallopeptidase 9 (MMP-9) on the proliferation, apoptosis, type I and III procollagen synthesis of rat dermal fibroblasts. METHODS: Lipopolysaccharide (LPS) at 0.1 and 1.0 microg/ml was used to stimulate fibroblasts to up-regulate the expression of MMP-9 for 18 and 48 h. And then RNA interference was employed to inhibit the high expression of MMP-9. Cell proliferation was tested by CCK-8, cell apoptosis by flow cytometry and type I and III procollagen expressions by quantitative reverse transcriptase PCR (qRT-PCR). RESULTS: The MMP-9 expression of fibroblasts increased after the stimulation of LPS. And the 1.0 microg/ml LPS stimulation of 48 hours was 14.25 times of mRNA expression and 2.31 times of protein expression versus that of the normal group (both P < 0.05). The RNA interference obviously inhibited the high expression of MMP-9. The mRNA expression was 1/8 and protein expression 1/3 (both P < 0.05) as compared with the control group. Cell proliferation decreased with the rising expression of MMP-9 to some extent [(1.08 +/- 0.08) vs (1.18 +/- 0.09), P < 0.05] and improved after the inhibition of high expression of MMP-9 [(1.78 +/- 0.17) vs (1.53 +/- 0.15), P < 0.01]. There was no change of apoptosis accompanied with high expression of MMP-9 (P > 0.05). Apoptosis decreased after the inhibition of high expression of MMP-9 for 48 hours (3.53% +/- 0.22% vs 4.47% +/- 0.46%, P < 0.05). The synthesis of type I procollagen was the same no matter up-regulation or down-regulation of MMP-9 expression (P > 0.05). As the expression of MMP-9 increased, the synthesis of type III procollagen decreased (P < 0.01), but not increased by 1.02 folds after the inhibited expression of MMP-9 (P > 0.05). CONCLUSION: MMP-9 can affect the biological behaviors of rat dermal fibroblasts.

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CRRD Object Information
CRRD ID: 8547905
Created: 2014-02-27
Species: All species
Last Modified: 2014-02-27
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.