title: Androgens induce CD-9 in human prostate tissue.
abstract: Based on microarray analyses of LNCaP and LNCaP-r prostatic cell-lines we tentatively identified CD-9 as an androgen sensitive protein. This prompted us to characterize the androgen sensitivity and the correlation to malignancy of CD-9 at the protein level. Using Western blot, RT-PCR and immunohistochemistry the expression of CD-9 was analysed in LNCaP cells stimulated during increasing time by the synthetic androgen R1881 and also in 88 specimens of human prostate cancer tissues. Expression of CD-9 was induced by R1881 in LNCaP. CD-9 was immunolocalized in human prostate tissue sections representing non-malignant tissue as well as tumour areas. In non-malignant glands CD-9 immunoreactivity was observed at the apical and lateral cell borders of luminal epithelial cells. Basal epithelial cells were largely unstained. In tumour areas CD-9 staining intensity was variable and apparently not related to primary Gleason grade. In prostate tissue from a patient under androgen ablation therapy no staining was observed in luminal epithelial cells or in the tumour areas, but some staining was observed in basal epithelial cells. CD-9 is regulated by androgens in LNCaP and present in human prostate specimens. The expression is variable and changes in expression levels. These and earlier studies using other tissues indicate that CD-9 and its cellular localization could have an important role in prostate cancer cell development.
authors.affiliation: Department of Molecular Medicine, Karolinska Hospital, Karolinska Institute, Stockholm, Sweden. ake.pousette@medhs.ki.se
authors.forename: Y
authors.initials: Y
authors.lastname: Chuan
authors.forename: S-T
authors.initials: ST
authors.lastname: Pang
authors.forename: A
authors.initials: A
authors.lastname: Bergh
authors.forename: G
authors.initials: G
authors.lastname: Norstedt
authors.forename: A
authors.initials: A
authors.lastname: Pousette
mesh_terms: D000728:Androgens / Q000494:pharmacology*; D015703:Antigens, CD / Q000096:biosynthesis*; D015153:Blotting, Western; D045744:Cell Line, Tumor; D005786:Gene Expression Regulation / Q000187:drug effects; D006801:Humans; D008297:Male; D008562:Membrane Glycoproteins / Q000096:biosynthesis*; D015741:Metribolone / Q000494:pharmacology*; D011467:Prostate / Q000187:drug effects* / Q000378:metabolism*; D011471:Prostatic Neoplasms / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D060245:Tetraspanin 29
chemical_list: D000728:Androgens; D015703:Antigens, CD; C554869:CD9 protein, human; D008562:Membrane Glycoproteins; D060245:Tetraspanin 29; D015741:Metribolone