title: Involvement of nuclear factor-kB activation through RhoA/Rho-kinase pathway in LPS-induced IL-8 production in human cervical stromal cells.
abstract: Interleukin-8 (IL-8) is a chemokine that recruits and activates neutrophils in stromal tissue and plays an essential role in cervical ripening. Nuclear factor-kB (NF-kB) is known to be important for the up-regulation of IL-8 gene expression. We examined the molecular mechanisms responsible for NF-kB activation in IL-8 production in cervical stromal cells. Lipopolysaccharide (LPS) and IL-1beta stimulated IL-8 production by cervical stromal cells in a dose-dependent manner. Pretreatment of cervical stromal cells with inhibitors of RhoA (C3 transferase exoenzyme), Rho-kinase (Y-27632) or NF-kB (BAY11-7082) effectively blocked LPS-induced IL-8 release. In contrast, IL-1beta-induced IL-8 production was significantly blocked by BAY11-7082, but not by C3 transferase exoenzyme or Y-27632. Pull-down assays showed that LPS activated RhoA, but IL-1beta caused only a lower level of activation. Transfection of the cervical stromal cells with RhoA small interfering RNA (siRNA) inhibited LPS-stimulated IL-8 production, whereas IL-1beta-induced IL-8 production was not significantly inhibited by knockdown of RhoA with siRNA. Using an NF-kB transcription reporter vector, luciferase assays demonstrated that incubation with LPS or IL-1beta induced the activation of NF-kB in cervical stromal cells. Activation of NF-kB by LPS was inhibited by treatment with C3 exoenzyme, Y-27632 or RhoA siRNA. However, inhibition of the RhoA/Rho-kinase pathway did not attenuate the activation of NF-kB by IL-1beta. These results suggest that LPS-induced IL-8 production is accompanied by enhanced NF-kB activation through the RhoA/Rho-kinase pathway in human cervical cells.
authors.affiliation: Osaka University Graduate School of Medicine, Department of Obstetrics and Gynecology, Osaka, Japan.
authors.forename: Shoko
authors.initials: S
authors.lastname: Shimizu
authors.forename: Masahiro
authors.initials: M
authors.lastname: Tahara
authors.forename: Seiji
authors.initials: S
authors.lastname: Ogata
authors.forename: Kae
authors.initials: K
authors.lastname: Hashimoto
authors.forename: Kenichiro
authors.initials: K
authors.lastname: Morishige
authors.forename: Keiichi
authors.initials: K
authors.lastname: Tasaka
authors.forename: Yuji
authors.initials: Y
authors.lastname: Murata
mesh_terms: D036002:ADP Ribose Transferases / Q000494:pharmacology; D000328:Adult; D000577:Amides / Q000494:pharmacology; D001905:Botulinum Toxins / Q000494:pharmacology; D002478:Cells, Cultured; D020070:Cervical Ripening / Q000378:metabolism; D002584:Cervix Uteri / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D004789:Enzyme Activation / Q000187:drug effects; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005260:Female; D006801:Humans; D020672:I-kappa B Proteins / Q000378:metabolism; D053583:Interleukin-1beta / Q000378:metabolism / Q000494:pharmacology; D016209:Interleukin-8 / Q000378:metabolism*; D047908:Intracellular Signaling Peptides and Proteins / Q000037:antagonists & inhibitors / Q000378:metabolism*; D008070:Lipopolysaccharides / Q000494:pharmacology*; D000072000:NF-KappaB Inhibitor alpha; D016328:NF-kappa B / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D009570:Nitriles / Q000494:pharmacology; D010766:Phosphorylation; D011247:Pregnancy; D017346:Protein Serine-Threonine Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D011725:Pyridines / Q000494:pharmacology; D034622:RNA Interference; D034741:RNA, Small Interfering / Q000235:genetics / Q000378:metabolism; D017154:Stromal Cells / Q000187:drug effects / Q000378:metabolism*; D013450:Sulfones / Q000494:pharmacology; D013997:Time Factors; D014158:Transcription, Genetic / Q000187:drug effects; D054460:rho-Associated Kinases; D020742:rhoA GTP-Binding Protein / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*
chemical_list: C434003:3-(4-methylphenylsulfonyl)-2-propenenitrile; D000577:Amides; D004791:Enzyme Inhibitors; D020672:I-kappa B Proteins; D053583:Interleukin-1beta; D016209:Interleukin-8; D047908:Intracellular Signaling Peptides and Proteins; D008070:Lipopolysaccharides; D016328:NF-kappa B; C000606204:NFKBIA protein, human; D009570:Nitriles; D011725:Pyridines; D034741:RNA, Small Interfering; D013450:Sulfones; C108830:Y 27632; D000072000:NF-KappaB Inhibitor alpha; D036002:ADP Ribose Transferases; C063007:exoenzyme C3, Clostridium botulinum; D017346:Protein Serine-Threonine Kinases; D054460:rho-Associated Kinases; D001905:Botulinum Toxins; D020742:rhoA GTP-Binding Protein