title: Glutathione S-transferase Pi mediates proliferation of androgen-independent prostate cancer cells.
abstract: Prostate cancers generally acquire an androgen-independent growth capacity with progression, resulting in resistance to antiandrogen therapy. Therefore, identification of the genes regulated through this process may be important for understanding the mechanisms of prostate carcinogenesis. We here utilized androgen-dependent/independent transplantable tumors, newly established with the 'transgenic rat adenocarcinoma in prostate' (TRAP) model, to analyze their gene expression using microarrays. Among the overexpressed genes in androgen-independent prostate cancers compared with the androgen-dependent tumors, glutathione S-transferase pi (GST-pi) was included. In line with this, human prostate cancer cell lines PC3 and DU145 (androgen independent) had higher expression of GST-pi compared with LNCaP (androgen dependent) as determined by semiquantitative reverse transcription-polymerase chain reaction analysis. To investigate the roles of GST-pi expression in androgen-independent human prostate cancers, GST-pi was knocked down by a small interfering RNA (siRNA), resulting in significant decrease of the proliferation rate in the androgen-independent PC3 cell line. In vivo, administration of GST-pi siRNA-atelocollagen complex decreased GST-pi protein expression, resulting in enhanced numbers of TdT mediated dUTP-biotin nick-end labering (TUNEL)-positive apoptotic cells. These findings suggest that GST-pi might play important roles in proliferation of androgen-independent human prostate cancer cells.
authors.affiliation: Department of Experimental Pathology and Tumor Biology, Nagoya City University Graduate School of Medical Sciences, Nagoya 467-8601, Japan.
authors.forename: Naomi
authors.initials: N
authors.lastname: Hokaiwado
authors.forename: Fumitaka
authors.initials: F
authors.lastname: Takeshita
authors.forename: Aya
authors.initials: A
authors.lastname: Naiki-Ito
authors.forename: Makoto
authors.initials: M
authors.lastname: Asamoto
authors.forename: Takahiro
authors.initials: T
authors.lastname: Ochiya
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Shirai
mesh_terms: D000728:Androgens; D000818:Animals; D030801:Animals, Genetically Modified; D017209:Apoptosis; D015153:Blotting, Western; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D051549:Glutathione S-Transferase pi / Q000378:metabolism*; D006801:Humans; D020287:In Situ Nick-End Labeling; D008297:Male; D009368:Neoplasm Transplantation; D020411:Oligonucleotide Array Sequence Analysis; D011471:Prostatic Neoplasms / Q000378:metabolism*; D034741:RNA, Small Interfering; D051381:Rats; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D000728:Androgens; D034741:RNA, Small Interfering; D051549:Glutathione S-Transferase pi