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Molecular Oncology, Markers, Clinical Correlates |
Departments of Urology [R. T., J. A. B., P. H. L., R. L. V.] and Pathology [L. D. T.], University of Washington, Seattle, Washington 98195
The precise mechanism(s) involved in invasion and metastasis of prostate cancer (CaP) is poorly understood. Osteonectin [ON (also known as SPARC or BM-40)] is an antiadhesive protein known to be involved in cell-matrix interactions, migration, and angiogenesis. In this report, we studied the expression of ON in human prostate cell lines, primary tumors, and metastatic foci of CaP. Reverse transcription-PCR and nonradioactive in situ hybridization (ISH) techniques were used to determine ON gene expression. Immunohistochemistry was carried out using the polyclonal antibody LF37 and/or the monoclonal antibody ON-mAb. Low to moderate levels of ON mRNA and protein were observed in glandular epithelial cells of normal tissue as well as a few primary CaPs. However, high levels of ON mRNA and protein were observed in most of the CaP metastatic foci, both osseous and nonosseous. This correlated well with our findings that multiple different CaP cell lines including four CaP cell lines derived from metastases show high levels of ON gene expression. Furthermore, ISH analyses and cell-specific reverse transcription-PCR evaluation showed that both the luminal and basal cells express the ON gene. We conclude that the differential pattern of ON expression suggests that it may play an important role in the progression of CaP.
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