Abstract
Background: The type IV collagenases/gelatinases matrix metalloproteinase-2 (MMP-2) and -9 (MMP-9) play an important role in cancer invasion and metastasis. In the present study, we measured the expression of mRNAs and enzymatic activities of MMP-9 and -2 in prostate tissues and serum samples from men with or without prostate cancer.
Methods: A total of 44 tissue samples (three from healthy volunteers, 21 from patients with benign prostate hyperplasia, 10 from patients with localized prostate cancer and 10 from patients with metastatic disease) and 71 serum samples were collected (20 from healthy volunteers, 26 from patients with benign prostatic hyperplasia, 10 from patients with localized cancer, 15 from patients with metastatic cancer). The level of mRNA for MMP-2 and -9 was determined by semiquantitative reverse transcriptase-polymerase chain reaction (RT-PCR). The enzymatic activity of MMPs was determined by zymography.
Results: Expression of MMP-9 mRNA was significantly higher in malignant than in nonmalignant prostate tissues (P<0.001), while no significant difference of MMP-2 expression was detected in different prostate tissues. Results of zymography showed that there was significant difference in the enzymatic activity of MMP-9, but not MMP-2, among normal prostate, BPH, localized and metastatic prostate cancer tissues, serum samples (P<0.05). The active form of MMP-2, with a molecular mass of 62 kDa, was detected in normal prostate, BPH and prostate cancer tissues, but not in the serum samples. Moreover, there was a significant difference in the ratio of the active form (62 kDa) and proform (72 kDa) of MMP-2 among normal, BPH and prostate cancer tissues. This ratio was further increased in metastatic prostate cancer tissues.
Conclusion: The activity of MMP-9 and the ratio of active form/proform of MMP-2 are associated with the progression and metastasis of prostate cancer.
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Acknowledgements
This research was funded by the following grants: 3 × 3 Canada China Biotechnology Seed Grant, the National Natural Science Foundation of China (Grant No. 30271297), and the United States Department of Health and Human Services, National Institutes of Health (NCI) Prostate Cancer SPORE (Grant No. P50 CA90386-01).
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Zhang, L., Shi, J., Feng, J. et al. Type IV collagenase (matrix metalloproteinase-2 and -9) in prostate cancer. Prostate Cancer Prostatic Dis 7, 327–332 (2004). https://doi.org/10.1038/sj.pcan.4500750
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DOI: https://doi.org/10.1038/sj.pcan.4500750
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