title: Retinoic acid regulates differentially the expression of IL-1 beta and IL-1 receptor antagonist (IL-1ra) in PMA-activated human monocytes.
abstract: Retinoic acid (RA) is a well-known immunological modulator. Although it has been shown that RA stimulates IL-1 expression in monocytes, it is of interest for understanding of the regulatory role of RA in inflammation to examine whether RA also modulates the expression of the IL-1 receptor antagonist (IL-1ra), which is reported to reduce IL-1 beta-mediated inflammation. In this study, we examined the effect of RA on expression of IL-1 beta and IL-ra in phorbol-myristate-acetate (PMA)-activated human monocytes. RA enhanced gene expression and production of IL-1 beta in PMA-activated monocytes. However, interestingly, gene expression and production of IL-1ra in the cells were markedly inhibited by RA. These results show that RA differentially regulates IL-1 beta and IL-ra expression in PMA-activated human monocytes and suggest that RA may promote IL-1-mediated inflammation.
authors.affiliation: First Department of Internal Medicine, Nihon University School of Medicine, Tokyo, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Hayashi
authors.forename: S
authors.initials: S
authors.lastname: Hashimoto
authors.forename: N
authors.initials: N
authors.lastname: Kitamura
authors.forename: S
authors.initials: S
authors.lastname: Hanazawa
authors.forename: T
authors.initials: T
authors.lastname: Horie
mesh_terms: D015152:Blotting, Northern; D002478:Cells, Cultured; D005786:Gene Expression Regulation / Q000187:drug effects*; D006801:Humans; D053590:Interleukin 1 Receptor Antagonist Protein; D007375:Interleukin-1 / Q000096:biosynthesis* / Q000097:blood; D007700:Kinetics; D009000:Monocytes / Q000187:drug effects / Q000276:immunology*; D012795:Sialoglycoproteins / Q000096:biosynthesis* / Q000097:blood; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*; D013997:Time Factors; D014158:Transcription, Genetic / Q000187:drug effects*; D014212:Tretinoin / Q000494:pharmacology*
chemical_list: C507763:IL1RN protein, human; D053590:Interleukin 1 Receptor Antagonist Protein; D007375:Interleukin-1; D012795:Sialoglycoproteins; D014212:Tretinoin; D013755:Tetradecanoylphorbol Acetate