title: Interaction between the androgen receptor and RNase L mediates a cross-talk between the interferon and androgen signaling pathways.
abstract: Signaling by androgens and interferons (IFN) plays an important role in prostate cancer initiation and progression. Using microarray analysis, we describe here a functional cross-talk between dihydrotestosterone and interferon signaling. Glutathione S-transferase pull-down and co-immunoprecipitation experiments reveal that the androgen receptor and the interferon-activated RNase L interact with each other in a ligand-dependent manner. Furthermore, overexpression of wild type RNase L confers IFN sensitivity to a dihydrotestosterone-inducible reporter gene, whereas R462Q-mutated RNase L does not. Based on our data we hypothesize that in 22RV1 cells, activated androgen receptor (AR) contributes to the insensitivity to IFN of the cell. Accordingly, we show that AR knockdown restores responsiveness to IFNgamma. Our findings support a model in which both the activation of AR and the down-regulation of IFN signaling can synergize to promote cell survival and suppress apoptosis. This model provides the molecular basis to understand how mutated RNase L can lead to early onset PCa and illustrates how inflammatory cytokines and nuclear hormone signaling contribute to tumor development.
authors.affiliation: Department of Molecular Endocrinology, Merck Research Laboratory, West Point, Pennsylvania 19486, USA. david_bettoun@merck.com
authors.forename: David J
authors.initials: DJ
authors.lastname: Bettoun
authors.forename: Angela
authors.initials: A
authors.lastname: Scafonas
authors.forename: Su Jane
authors.initials: SJ
authors.lastname: Rutledge
authors.forename: Paul
authors.initials: P
authors.lastname: Hodor
authors.forename: Oliver
authors.initials: O
authors.lastname: Chen
authors.forename: Carlo
authors.initials: C
authors.lastname: Gambone
authors.forename: Robert
authors.initials: R
authors.lastname: Vogel
authors.forename: Sheila
authors.initials: S
authors.lastname: McElwee-Witmer
authors.forename: Chang
authors.initials: C
authors.lastname: Bai
authors.forename: Leonard
authors.initials: L
authors.lastname: Freedman
authors.forename: Azriel
authors.initials: A
authors.lastname: Schmidt
mesh_terms: D000728:Androgens / Q000378:metabolism; D017209:Apoptosis; D001943:Breast Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D045744:Cell Line, Tumor; D002470:Cell Survival; D013196:Dihydrotestosterone / Q000494:pharmacology; D004722:Endoribonucleases / Q000235:genetics / Q000378:metabolism*; D004789:Enzyme Activation; D005260:Female; D015870:Gene Expression / Q000187:drug effects; D017930:Genes, Reporter; D006801:Humans; D007371:Interferon-gamma / Q000494:pharmacology; D007372:Interferons / Q000378:metabolism*; D008024:Ligands; D008297:Male; D008954:Models, Biological; D009154:Mutation; D011471:Prostatic Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D020239:Receptor Cross-Talk; D011944:Receptors, Androgen / Q000235:genetics / Q000378:metabolism*; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction
chemical_list: D000728:Androgens; D008024:Ligands; D011944:Receptors, Androgen; D011994:Recombinant Proteins; D013196:Dihydrotestosterone; D007371:Interferon-gamma; D007372:Interferons; D004722:Endoribonucleases; C031956:2-5A-dependent ribonuclease