P38 MAPK regulates IL-1β induced IL-6 expression through mRNA stability in osteoblasts

被引:60
作者
Patil, C
Zhu, XS
Rossa, C
Kim, YJ
Kirkwood, KL
机构
[1] SUNY Buffalo, Dept Oral Biol, Buffalo, NY 14260 USA
[2] SUNY Buffalo, Dept Periodont & Endodont, Buffalo, NY 14260 USA
[3] SUNY Buffalo, Dept Pharmacol & Toxicol, Buffalo, NY 14260 USA
[4] Chonnam Natl Univ, Dept Periodont, Kwangju, South Korea
关键词
IL-6; IL-1; beta; osteoblasts; gene expression; p38; MAPK; mRNA; stability; GFP; ARE;
D O I
10.1081/IMM-120034231
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
Osteoblast-derived IL-6 functions in coupled bone turnover by supporting osteoclastogenesis favoring bone resorption instead of bone deposition. Gene regulation of IL-6 is complex occurring both at transcription and post-transcription levels. The focus of this paper is at the level of mRNA stability, which is important in IL-6 gene regulation. Using the MC3T3-E1 as an osteoblastic model, IL-6 secretion was dose dependently decreased by SB203580, a p38 MAPK inhibitor. Steady state IL-6 mRNA was decreased with SB203580 (2 muM) ca. 85% when stimulated by IL-1beta (1-5 ng/ ml). These effects require de novo protein synthesis as they were inhibited by cycloheximide. p38 MAPK had minor effects on proximal IL-6 promoter activity in reporter gene assays. A more significant effect on IL-6 mRNA stability was observed in the presence of SB203580. Western blot analysis confirmed that SB203580 inhibited p38 MAP kinase, in response to IL-1beta in a dose dependent manner in MC3T3-E1 cells. Stably transfected MC3T3-E1 reporter cell lines (MC6) containing green fluorescent protein (GFP) with the 3'untranslated region of IL-6 were constructed. Results indicated that IL-1beta, TNFalpha, LPS but not parathyroid hormone (PTH) could increase GFP expression of these reporter cell lines. Endogenous IL-6 and reporter gene eGFP-IL-6 3'UTR mRNA was regulated by p38 in MC6 cells. In addition, transient transfection of IL-6 3'UTR reporter cells with immediate upstream MAP kinase kinase-3 and -6 increased GFP expression compared to mock transfected controls. These results indicate that p38 MAPK regulates IL-1beta-stimulated IL-6 at a post transcriptional mechanism and one of the primary targets of IL-6 gene regulation is the 3'UTR of IL-6.
引用
收藏
页码:213 / 233
页数:21
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