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  • Characterization of osteoblastic and osteolytic proteins in prostate cancer bone metastases.

Characterization of osteoblastic and osteolytic proteins in prostate cancer bone metastases.

The Prostate (2013-01-22)
Sandy R Larson, Xiaotun Zhang, Ruth Dumpit, Ilsa Coleman, Bryce Lakely, Martine Roudier, Celestia S Higano, Lawrence D True, Paul H Lange, Bruce Montgomery, Eva Corey, Peter S Nelson, Robert L Vessella, Colm Morrissey
ABSTRACT

Approximately 90% of patients who die of Prostate Cancer (PCa) have bone metastases, which promote a spectrum of osteoblastic, osteolytic or mixed bone responses. Numerous secreted proteins have been reported to promote osteoblastic or osteolytic bone responses. We determined whether previously identified and/or novel proteins were associated with the osteoblastic or osteolytic response in clinical specimens of PCa bone metastases. Gene expression was analyzed on 14 PCa metastases from 11 patients by microarray profiling and qRT-PCR, and protein expression was analyzed on 33 PCa metastases from 30 patients by immunohistochemistry on highly osteoblastic and highly osteolytic bone specimens. Transcript and protein levels of BMP-2, BMP-7, DKK-1, ET-1, and Sclerostin were not significantly different between osteoblastic and osteolytic metastases. However, levels of OPG, PGK1, and Substance P proteins were increased in osteoblastic samples. In addition, Emu1, MMP-12, and sFRP-1 were proteins identified with a novel role of being associated with either the osteoblastic or osteolytic bone response. This is the first detailed analysis of bone remodeling proteins in human specimens of PCa bone metastases. Three proteins not previously shown to be involved may have a role in the PCa bone response. Furthermore, our data suggests that the relative expression of numerous, rather than a single, bone remodeling proteins determine the bone response in PCa bone metastases.

MATERIALS
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Brand
Product Description

Sigma-Aldrich
3-Phosphoglyceric Phosphokinase from baker's yeast (S. cerevisiae), ammonium sulfate suspension, ≥500 units/mg protein
Sigma-Aldrich
Anti-EMID1 antibody produced in rabbit, Prestige Antibodies® Powered by Atlas Antibodies, affinity isolated antibody, buffered aqueous glycerol solution