Linked Life Data

17606477

Source:http://linkedlifedata.com/resource/pubmed/id/17606477

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pubmed-article:17606477pubmed:abstractTextWe have shown previously that interleukin-8 (IL-8) and IL-8 receptor expression is elevated in tumor cells of human prostate biopsy tissue and correlates with increased cyclin D1 expression. Using PC3 and DU145 cell lines, we sought to determine whether IL-8 signaling regulated cyclin D1 expression in androgen-independent prostate cancer (AIPC) cells and to characterize the signaling pathways underpinning this response and that of IL-8-promoted proliferation. Administration of recombinant human IL-8 induced a rapid, time-dependent increase in cyclin D1 expression in AIPC cells, a response attenuated by the translation inhibitor cycloheximide but not by the RNA synthesis inhibitor, actinomycin D. Suppression of endogenous IL-8 signaling using neutralizing antibodies to IL-8 or its receptors also attenuated basal cyclin D1 expression in AIPC cells. Immunoblotting using phospho-specific antibodies confirmed that recombinant human IL-8 induced rapid time-dependent phosphorylation of Akt and the mammalian target of rapamycin substrate proteins, 4E-BP1 and ribosomal S6 kinase, resulting in a downstream phosphorylation of the ribosomal S6 protein (rS6). LY294002 and rapamycin each abrogated the IL-8-promoted phosphorylation of rS6 and attenuated the rate of AIPC cell proliferation. Our results indicate that IL-8 signaling (a) regulates cyclin D1 expression at the level of translation, (b) regulates the activation of proteins associated with the translation of capped and 5'-oligopyrimidine tract transcripts, and (c) activates signal transduction pathways underpinning AIPC cell proliferation. This study provides a molecular basis to support the correlation of IL-8 expression with that of cyclin D1 in human prostate cancer and suggests a mechanism by which this chemokine promotes cell proliferation.lld:pubmed
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pubmed-article:17606477pubmed:articleTitleInterleukin-8 signaling promotes translational regulation of cyclin D in androgen-independent prostate cancer cells.lld:pubmed
pubmed-article:17606477pubmed:affiliationCentre for Cancer Research and Cell Biology, Queen's University Belfast, Belfast City Hospital, University Floor, Lisburn Road, Belfast BT9 7AB, Northern Ireland.lld:pubmed
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