Cigrette smoke condensate upregulates the gene and protein expression of proinflammatory cytokines in human fibroblast-like synoviocyte line

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出版者ポリシー：機関リポジトリへの掲載不可.全文非公開.Rheumatoid arthritis (RA) is characterized by proliferation of synoviocytes that produce proinflammatory cytokines, which are implicated in the pathogenesis of RA. When human fibroblast-like synoviocytes line MH7A was treated with cigarette smoke condensate (CSC), either mainstream or sidestream, expression levels of interleukin (IL)-1α, IL-1β, IL-6, IL-8, and CYP1A1 mRNA were upregulated in both time- and dose-dependent manners. The upregulatory effects of CSC on these cytokines were not significantly inhibited by α-naphthoflavone, an aryl hydrocarbon receptor (AhR) antagonist, suggesting that the effects of CSC were independent of AhR. Cycloheximide treatment indicated that the augmenting effect of CSC on IL-1α, IL-1β and IL-8, but not IL-6 and CYP1A1, mRNA expression requires de novo protein synthesis. CSC also induced cytokines at protein levels and further augmented the effects of tumor necrosis factor α on induction of these cytokines at both mRNA and protein levels. These results support the epidemiological studies indicating a strong association between heavy cigarette smoking and pathogenesis of RA.
2008-08-01