IL-1beta induces stabilization of IL-8 mRNA in malignant breast cancer cells via the 3' untranslated region: Involvement of divergent RNA-binding factors HuR, KSRP and TIAR.
IL-8 plays an integral role in promoting the malignant phenotype in breast cancer, and its production is directly influenced by inflammatory cytokines in the tumor microenvironment. Here, we show that activation of IL-1beta receptors on malignant HS578t and MDA-MB-231 breast cancer cells strongly induces IL-8 expression and that RNA stabilization is persistently activated at least 12-24 hr after stimulation. SB 203580 and rapamycin reversed the RNA stabilization effect of IL-1beta in a dose-dependent manner, suggesting involvement of the p38/MAP kinase and mTOR pathways. A luciferase reporter assay indicated that the stabilization effect was dependent on cis elements in the 3'-untranslated region (UTR) of the IL-8 transcript. By UV cross-linking, we identified multiple cellular factors that interact with the IL-8 3'UTR, ranging 34-76 kDa. Immunoprecipitation analysis indicated that HuR, KSRP and TIAR bound to one or more loci in the 3'UTR. While the cross-linking patterns were similar, quantitative immunoprecipitation of native IL-8 RNA from IL-1beta-stimulated cytoplasmic extract revealed a 20-fold greater association of transcript with the stabilizing factor HuR vs. the destabilizing factor KSRP. In conclusion, IL-1beta is a potent cytokine stimulus for IL-8 RNA stabilization in breast cancer cells, possibly by enhanced binding of cytoplasmic HuR to the 3'UTR.
Suswam
Esther A
EA
Birmingham Veterans Affairs Medical Center, Birmingham, AL, USA.
Nabors
L Burt
LB
Huang
Yuanyuan
Y
Yang
Xiuhua
X
King
Peter H
PH
D020413:3' Untranslated Regions / Q000235:genetics; D000954:Antigens, Surface / Q000378:metabolism*; D001483:Base Sequence; D001943:Breast Neoplasms / Q000235:genetics* / Q000276:immunology; D045744:Cell Line, Tumor; D017931:DNA Primers; D051959:ELAV Proteins; D000067780:ELAV-Like Protein 1; D005260:Female; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects / Q000276:immunology*; D006801:Humans; D007375:Interleukin-1 / Q000494:pharmacology*; D016209:Interleukin-8 / Q000235:genetics*; D012333:RNA, Messenger / Q000235:genetics; D016601:RNA-Binding Proteins / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015534:Trans-Activators / Q000378:metabolism*
D020413:3' Untranslated Regions; D000954:Antigens, Surface; D017931:DNA Primers; D051959:ELAV Proteins; D000067780:ELAV-Like Protein 1; C098770:ELAVL1 protein, human; D007375:Interleukin-1; D016209:Interleukin-8; C105789:KHSRP protein, human; D012333:RNA, Messenger; D016601:RNA-Binding Proteins; D015534:Trans-Activators; C076751:TIAL1 protein, human