Nickel ions bind to HSP90β and enhance HIF-1α-mediated IL-8 expression

Sanki Asakawa, Ryo Onodera, Koji Kasai, Yu Kishimoto, Taiki Sato, Ryosuke Segawa, Natsumi Mizuno, Kouetsu Ogasawara, Takahiro Moriya, Masahiro Hiratsuka, Noriyasu Hirasawa

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Nickel ions (Ni2+) eluted from biomedical devices cause inflammation and Ni allergy. Although Ni2+ and Co2+ elicit common effects, Ni2+ induces a generally stronger inflammatory reaction. However, the molecular mechanism by which Ni2+ and Co2+ induce such different responses remains to be elucidated. In the present study, we compared the effects of Ni2+ and Co2+ on the expression of interleukin (IL)-8 in human monocyte THP-1 cells. We report that NiCl2 but not CoCl2 induced the expression of IL-8; in contrast, CoCl2 elicited a higher expression of hypoxia-inducible factor-1α (HIF-1α). The NiCl2-induced expression of IL-8 in late phase was blocked by a HIF-1α inhibitor, PX-478, indicating that NiCl2 targets additional factors responsible for activating HIF-1α. To identify such targets, proteins that bound preferentially to Ni-NTA beads were analyzed by LC/MS/MS. The analysis yielded heat shock protein 90β (HSP90β) as a possible candidate. Furthermore, Ni2+ reduced the interaction of HSP90β with HIF-1α and instead promoted the interaction between HIF-1α and HIF-1β as well as the nuclear localization of HIF-1α. Using various deletion variants, we showed that Ni2+ could bind to the linker domain on HSP90β. These results suggest that HSP90β plays important roles in Ni2+-induced production of IL-8 and could be a potential target for the regulation of Ni2+-induced inflammation.

Original languageEnglish
Pages (from-to)45-53
Number of pages9
JournalToxicology
Volume395
DOIs
Publication statusPublished - 2018 Feb 15

Keywords

  • HIF-1α
  • HIF-1β
  • HSP90
  • Interleukin 8
  • Nickel
  • THP-1

ASJC Scopus subject areas

  • Toxicology

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