Nickel ions selectively inhibit lipopolysaccharide-inducedinterleukin-6 production by decreasing its mRNA stability

Sanki Asakawa, Yu Kishimoto, Takayuki Takano, Kiyuki Okita, Shiho Takakuwa, Taiki Sato, Masahiro Hiratsuka, Osamu Takeuchi, Noriyasu Hirasawa

研究成果: ジャーナルへの寄稿学術論文査読

12 被引用数 (Scopus)

抄録

Nickel (Ni) ions easily elute from many alloys and elicit inflammation and allergies. Previous studies have shown that infections due to the implantation of medical devices cause inflammation and enhance the elution of Ni ions (Ni2+). However, cross-talk between infectionand Ni2+-induced signaling pathways has not yet been elucidated in detail. In the present study, we investigated the effects of Ni2+ on the lipopolysaccharide (LPS)-induced production of cytokines in a LPS-induced air pouch-type inflammation model in BALB/c mice and the murine macrophage cell line RAW264. We demonstrated that Ni2+ inhibited the LPS-induced production of interleukin (IL)-6, but not that of tumor necrosis factor (TNF)-α both in vivo and in vitro. This inhibitory effect was also observed with cobalt ion (Co2+), but not with chloride ion (Cl-), zinc ion (Zn2+), or palladium ion (Pd2+), and was highly selective to the production of IL-6. Ni2+ did not inhibit the activation of ERK1/2, p38 MAPK, or JNK. Although Ni2+ decreased IL-6 mRNA levels, it failed to inhibit the LPS-induced activation of the IL-6 promoter. An experiment using actinomycin D, a transcription inhibitor, revealed that Ni2+ decreased the stability of IL-6 mRNA. Moreover, Ni2+ inhibited the LPS-induced expression of Arid5a, but not regnase-1. These results demonstrated that Ni2+ may have selectively inhibited the LPS-induced production of IL-6 by decreasing the Arid5adependent stabilization of IL-6 mRNA.

本文言語英語
論文番号e0119428
ジャーナルPLoS ONE
10
3
DOI
出版ステータス出版済み - 2015 3月 5

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