title: Regulation of trespin expression by modulators of cell growth, differentiation, and apoptosis in prostatic epithelial cells.
abstract: We recently identified a novel rat ov-serpin, Trespin, which inhibits the trypsin-like serine proteinase plasmin and is expressed in several tissues, including prostate. In this report Trespin expression was studied in prostatic cell lines, NRP-152, NRP-154, and DP-153, derived from the Lobund-Wistar rat. Northern blots revealed Trespin mRNA is expressed in NRP-152 and DP-153 basal epithelial cell lines but not in the luminal line, NRP-154. Similarly, Trespin levels drop >30-fold following transdifferentiation of NRP-152 cells toward a luminal variant, further suggesting Trespin expression is specific for basal prostatic epithelial cells. Trespin expression in NRP-152 cells is up-regulated by dexamethasone (Dex) and insulin-like growth factor-I (IGF-I), each of which stimulate growth and prevent differentiation and apoptosis. However, Dex (alone) facilitates loss of Trespin by TGF-beta, yet enhances the ability of LR(3)-IGF-I to reverse such loss, similar to the pattern of apoptosis induced by TGF-beta. Likewise, several apoptosis inducers markedly decrease Trespin mRNA levels. HEK293 cells stably overexpressing Trespin display increased cell proliferation and partial resistance to growth inhibition and phosphorylation of c-Jun induced by the phorbol ester 12-O-tetradecanoylphorbol 13-acetate (TPA). Together these data strongly suggest that Trespin has critical functions tied to the regulation of growth, differentiation, and apoptosis of prostatic epithelial cells.
authors.affiliation: Laboratory of Cell Regulation and Carcinogenesis, National Cancer Institute, NIH, Bethesda, MD 20892, USA.
authors.forename: LaMonica V
authors.initials: LV
authors.lastname: Stewart
authors.forename: Kyung
authors.initials: K
authors.lastname: Song
authors.forename: Andrew Y
authors.initials: AY
authors.lastname: Hsing
authors.forename: David
authors.initials: D
authors.lastname: Danielpour
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects / Q000502:physiology*; D002454:Cell Differentiation / Q000187:drug effects / Q000502:physiology*; D002455:Cell Division / Q000187:drug effects / Q000502:physiology*; D002478:Cells, Cultured; D003907:Dexamethasone / Q000494:pharmacology; D004847:Epithelial Cells / Q000187:drug effects / Q000378:metabolism*; D005786:Gene Expression Regulation / Q000187:drug effects / Q000235:genetics; D006801:Humans; D007334:Insulin-Like Growth Factor I / Q000494:pharmacology; D008297:Male; D010703:Phorbol Esters / Q000494:pharmacology; D011467:Prostate / Q000187:drug effects / Q000254:growth & development* / Q000378:metabolism; D016755:Proto-Oncogene Proteins c-jun / Q000187:drug effects / Q000378:metabolism; D012333:RNA, Messenger / Q000187:drug effects / Q000378:metabolism; D051381:Rats; D015843:Serpins / Q000235:genetics*; D016212:Transforming Growth Factor beta / Q000494:pharmacology; D053773:Transforming Growth Factor beta1; D015854:Up-Regulation / Q000187:drug effects / Q000502:physiology
chemical_list: D010703:Phorbol Esters; D016755:Proto-Oncogene Proteins c-jun; D012333:RNA, Messenger; C464802:Serpinb10 protein, rat; D015843:Serpins; C508960:TGFB1 protein, human; C508962:Tgfb1 protein, rat; D016212:Transforming Growth Factor beta; D053773:Transforming Growth Factor beta1; D007334:Insulin-Like Growth Factor I; D003907:Dexamethasone