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Open Access Highly Accessed Research article

Involvement of CD147 in overexpression of MMP-2 and MMP-9 and enhancement of invasive potential of PMA-differentiated THP-1

Jun Zhou123, Ping Zhu1*, Jian Li Jiang2, Qing Zhang2, Zhen Biao Wu1, Xi Ying Yao2, Hao Tang2, Ning Lu1, Yong Yang1 and Zhi Nan Chen2*

Author Affiliations

1 Department of Clinical Immunology, First Affiliated Hospital, Fourth Military Medical University, 17 Changlexilu, Xi'an 710032, Shaanxi, P.R. of China

2 Department of Cell Biology / Cell Engineering Research Center, Fourth Military Medical University, 17 Changlexilu, Xi'an 710032, Shaanxi, P.R. of China

3 Department of pharmacology, School of Medicine of Xi'an Jiaotong University, Xi'an 710061, Shaanxi, P.R. of China

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BMC Cell Biology 2005, 6:25  doi:10.1186/1471-2121-6-25

Published: 17 May 2005

Abstract

Background

During infection and inflammation, circulating blood monocytes migrate from the intravascular compartments to the extravascular compartments, where they mature into tissue macrophages. The maturation process prepares the cells to actively participate in the inflammatory and immune responses, and many factors have been reported to be involved in the process. We found in our study that CD147 played a very important role in this process.

Results

By using PMA-differentiated human monocyte cells line THP-1, we found that CD147 mediated matrix metalloproteinases (MMPs) expression of the leukemic THP-1 cells and thus enhanced the invasiveness of THP-1 cells. After 24 hours of PMA-induced monocyte differentiation, the mean fluorescence intensity of CD147 in differentiated THP-1 cells (289.61 ± 31.63) was higher than that of the undifferentiated THP-1 cells (205.1 ± 19.25). There was a significant increase of the levels of proMMP-2, proMMP-9 and their activated forms in the differentiated THP-1 cells. Invasion assays using reconstituted basement membrane showed a good correlation between the invasiveness of THP-1 cells and the production of MMP-2 and MMP-9. The difference in the MMPs expression and the invasive ability was significantly blocked by HAb18G/CD147 antagonistic peptide AP-9. The inhibitory rate of the secretion of proMMP-9 in the undifferentiated THP-1 cells was 45.07%. The inhibitory rate of the secretion of proMMP-9, the activated MMP-9 and proMMP-2 in the differentiated THP-1 cells was 52.90%, 53.79% and 47.80%, respectively. The inhibitory rate of invasive potential in the undifferentiated cells and the differentiated THP-1 cells was 41.82 % and 25.15%, respectively.

Conclusion

The results suggest that the expression of CD147 is upregulated during the differentiation of monocyte THP-1 cells to macrophage cells, and CD147 induces the secretion and activation of MMP-2 and MMP-9 and enhances the invasive ability of THP-1 cells. The matured monocytes / macrophages, via their high expression of CD147, may play an important role in promoting the tissue repair or tissue damage during their inflammatory response.