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Objective: To determine the expression of bone morphogenetic protein 2 and 4 (BMP-2 and BMP-4) in prostatic carcinoma (PCa) and investigate their relationship with clinical stage and Gleason score of tumor.
Methods: Forty-eight PCa cases and 5 normal prostatic tissue were analysed for the expressions of BMP-2 and BMP-4 by Western bolt assay.
Results: The optical densities of BMP-2 expressions in the tumor with Gleason score < or =5, 6-8, and > or = 9 were 7547.1 +/- 1964.12, 9657.4 +/- 2010.54, 12467.7 +/- 2496.75 and of BMP-4 expressions were 5174.4 +/- 1400.54, 5940.3 +/- 1587.42, 6332.1 +/- 1647.83, respectively. The optical densities of BMP-2 expressions in the tumor in T1 - T2 and T3 - T4 stages were 8003.37 +/- 1889.23, 12385.55 +/- 2506.72 and of BMP4 expressions were 5267.41 +/- 1 464.19, 6543.75 +/- 1668.46, respectively. There were significant differences between tissues with Gleason score < or =5 and > or =9 (P <0.01), and tissues in T1 - T2 and T3 - T4 stages, in expressions of BMP-2 protein. The expression of BMP-2 protein was significantly high in the PCa with bone metastasis compared with that without bone metastasis.
Conclusion: The expressions of BMP-2 and BMP-4 increase with the progression of clinical stage and Gleason score compared with normal prostatic tissue. The expression of BMP-2 protein is significantly upregulated in bone metastasis of PCa, which indicates a poor prognosis.
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