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Prostate-specific antigen induces osteoplastic changes by an autonomous mechanism
H Yonou1, Y Aoyagi, N Kanomata
1Pathology Division, Division of Thoracic Oncology, National Cancer Center Research Institute East, National Cancer Center Hospital East, 6-5-1 Kashiwanoha, Kashiwa, Chiba, 277-8577, Japan.
Biochemical and Biophysical Research Communications
|December 14, 2001
Summary
Prostate-specific antigen (PSA) drives bone metastasis in prostate cancer by stimulating osteoblasts directly. This mechanism bypasses the need for cancer cells to produce bone growth factors, offering new therapeutic targets.
Area of Science:
- Oncology
- Bone Biology
- Biochemistry
Background:
- Prostate cancer (PC) frequently metastasizes to bone, causing osteoplastic lesions.
- Prostate-specific antigen (PSA), a marker for PC, is implicated in bone metastasis.
- The exact mechanism by which PC cells stimulate bone formation remains unclear.
Purpose of the Study:
- To investigate the role of PSA in promoting osteoplastic bone metastasis.
- To elucidate the cellular mechanisms underlying PSA-induced bone changes.
Main Methods:
- In vitro studies exposing osteoblasts to PSA.
- In vivo experiments using human bone xenografts in NOD/SCID mice.
- Assessment of osteoblast proliferation, TGF-beta mRNA expression, and bone volume.
Main Results:
- PSA exposure increased osteoblast proliferation and transforming growth factor-beta (TGF-beta) mRNA expression in vitro.
- Anti-TGF-beta antibodies and protease inhibitors blocked PSA-induced osteoblast proliferation.
- In vivo, PSA significantly enhanced osteoplastic changes in bone xenografts.
- Alpha(1)-antichymotrypsin inhibited PSA-induced bone volume increase.
Conclusions:
- PSA directly stimulates osteoblasts, promoting osteoplastic bone changes.
- This effect is mediated by an osteoblast-autonomous mechanism involving TGF-beta.
- PSA-induced bone metastasis is independent of PC-derived growth factors.