A telomerase-immortalized primary human prostate cancer clonal cell line with neoplastic phenotypes

Abstract

Understanding of molecular genetic mechanisms underlying prostate carcinogenesis would be greatly advanced by in vitro models of prostate tumors representing primary tumors. We have successfully established a neoplastic immortalized human prostate epithelial (HPE) clonal culture derived from a primary tumor of a prostate cancer patient (RC-58T) with hTERT, the catalytic subunit of telomerase. The early passage RC-58T cells derived from a radical prostatectomy specimen of a 52-year-old white male patient was transduced through infection with a retrovirus vector expressing the hTERT for the establishment of the RC-58T/hTERT cell line. One clonal line, soft-agar derived from the RC-58T/hTERT cell line, was isolated and further characterized phenotypically and genetically. These clonal (RC-58T/hTERT SA#4) cells are currently growing well at passage 70 and exhibit transformed morphology. The RC-58T/hTERT SA#4 line expressed a high level of telomerase activity and showed anchorage-independent growth in soft agar. The clonal line like the untransduced RC-58T cells (passage 3) expressed prostate specific antigen (PSA), androgen receptor (AR), prostate stem cell antigen (PSCA), and an androgen-regulated prostate specific gene NKX3.1, P16, and cytokeratin (CK) 8. Growth is slightly stimulated by dihydrotestosterone (DHT), and lyates are immunoreactive with AR antibody by Western blot analysis. More importantly, this clonal line produced adenocarcinomas when transplanted into SCID mice. A number of chromosome alterations were observed including the loss of chromosome Y, 1q, 2p, 3p, 4q, 8p, 11p, 14p, 17p and 18q. Our results demonstrate that this primary tumor-derived HPE cell line retained its neoplastic phenotypes and its prostate specific markers and should allow elucidating molecular and genetic alterations involved in prostate cancer. This is the first documented case of an AR and PSA expressing telomerase established human prostate cancer cell line with neoplastic phenotypes from a primary tumor of a prostate cancer patient.