title: Differential expression of IL-17RC isoforms in androgen-dependent and androgen-independent prostate cancers.
abstract: IL-17RC (interleukin-17 receptor-like) gene codes for a transmembrane protein, the full length of which inhibits apoptosis in prostate cancer cells. IL-17RC gene transcribes over a dozen different splice variants of mRNA. However, it is not known whether there are relevant protein isoforms. Here we report that different IL-17RC protein isoforms were detected by two different antibodies. The isoform as detected byanti-IL-17RC intracellular domain antibodies (anti-ICD) was expressed at higher levels in androgen-independent prostate cancer cell lines (PC3 and DU145) than in androgen-dependent prostatic cell lines (RWPE-1, pRNS-1-1, MLC-SV40, and LNCaP). In contrast, several isoforms as detected by anti-IL-17RC extracellular domain antibodies (anti-ECD) were expressed at significantly higher levels in androgen-dependent prostatic cell lines than in androgen-independent ones. Furthermore, immunohistochemical staining of prostate tissue microarrays showed that IL-17RC protein expression was significantly higher in androgen-independent prostate cancers than in androgen-dependent ones when anti-ICD was used, whereas the trend was reversed using anti-ECD. These observations provide evidence that IL-17RC protein isoforms are differentially expressed in prostatic cells and cancer tissues and may play a negative or positive role in the initiation and progression of prostate cancer.
authors.affiliation: The Lawrence Ellison Center for Tissue Regeneration and Repair, Department of Orthopedic Surgery, School of Medicine, University of California-Davis, Sacramento, CA 95817, USA. zyou@ucdavis.edu
authors.forename: Zongbing
authors.initials: Z
authors.lastname: You
authors.forename: Ying
authors.initials: Y
authors.lastname: Dong
authors.forename: Xiangtian
authors.initials: X
authors.lastname: Kong
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang
authors.forename: Robert L
authors.initials: RL
authors.lastname: Vessella
authors.forename: Jonathan
authors.initials: J
authors.lastname: Melamed
mesh_terms: D000728:Androgens / Q000494:pharmacology*; D015153:Blotting, Western; D005109:Extracellular Matrix / Q000276:immunology / Q000378:metabolism; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male; D009376:Neoplasms, Hormone-Dependent / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D010957:Plasmids; D011471:Prostatic Neoplasms / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D020033:Protein Isoforms / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D018123:Receptors, Interleukin / Q000235:genetics / Q000378:metabolism*; D014407:Tumor Cells, Cultured
chemical_list: D000728:Androgens; C448419:IL17RC protein, human; D020033:Protein Isoforms; D012333:RNA, Messenger; D018123:Receptors, Interleukin