Correlation of the osteoblastic phenotype with prostate-specific antigen expression in metastatic prostate cancer: implications for paracrine growth.
The characteristic sclerotic appearance of bone metastases from prostate cancer is unexplained but could involve excess peritumoural activity of osteoblast mitogens such as the insulin-like growth factors (IGFs). Since prostatic metastases are distinguished by androgen-dependent secretion of prostate-specific antigen (PSA), a serine protease which cleaves extracellular IGF-binding proteins and thereby enhances the bioavailability of IGFs, the relationship was examined between tumour PSA expression and the osteoblastic phenotype. To this end, a cohort of 27 prostate cancer patients was evaluated to determine the relationship between serum PSA and radiographic bone lesion density at first presentation with metastatic disease. No linear correlation between absolute PSA levels and metastatic osteosclerosis was apparent. However, non-parametric statistical analysis revealed a highly significant link between low-PSA (<20 ng/ml) metastatic prostate cancer and osteolytic bone lesions (p<0.0001, chi(2)=21.5). This finding raises the possibility that the osteoblastic phenotype of prostate cancer derives in part from PSA-dependent proteolysis of IGF-binding proteins within bone matrix.
Department of Urology, Imperial College School of Medicine, London, U.K.
A
A
Doherty
G
G
Smith
L
L
Banks
T
T
Christmas
R J
RJ
Epstein
D001859:Bone Neoplasms / Q000097:blood / Q000473:pathology / Q000556:secondary*; D006801:Humans; D018972:Insulin-Like Growth Factor Binding Protein 3 / Q000097:blood; D008297:Male; D010006:Osteoblasts / Q000473:pathology*; D010026:Osteosclerosis / Q000097:blood / Q000000981:diagnostic imaging; D019899:Paracrine Communication; D010641:Phenotype; D017430:Prostate-Specific Antigen / Q000097:blood*; D011471:Prostatic Neoplasms / Q000097:blood / Q000473:pathology*; D011859:Radiography
D018972:Insulin-Like Growth Factor Binding Protein 3; D017430:Prostate-Specific Antigen