2. Academic Validation
  3. Salubrinal acts as a Dusp2 inhibitor and suppresses inflammation in anti-collagen antibody-induced arthritis

Salubrinal acts as a Dusp2 inhibitor and suppresses inflammation in anti-collagen antibody-induced arthritis

  • Cell Signal. 2015 Apr;27(4):828-35. doi: 10.1016/j.cellsig.2015.01.010.
Kazunori Hamamura 1,  Akinobu Nishimura 2,  Andy Chen 3,  Shinya Takigawa 2,  Akihiro Sudo 4,  Hiroki Yokota 5
Affiliations

Affiliations

  • 1 Department of Biomedical Engineering, Indiana University Purdue University Indianapolis, Indianapolis, IN 46202, USA. Electronic address: hamak@dpc.agu.ac.jp.
  • 2 Department of Biomedical Engineering, Indiana University Purdue University Indianapolis, Indianapolis, IN 46202, USA; Department of Orthopaedic Surgery, Mie University Graduate School of Medicine, Mie 514, Japan.
  • 3 Department of Biomedical Engineering, Indiana University Purdue University Indianapolis, Indianapolis, IN 46202, USA.
  • 4 Department of Orthopaedic Surgery, Mie University Graduate School of Medicine, Mie 514, Japan.
  • 5 Department of Biomedical Engineering, Indiana University Purdue University Indianapolis, Indianapolis, IN 46202, USA; Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA.
PMID: 25619567 DOI: 10.1016/j.cellsig.2015.01.010
Abstract

Dual-specificity Phosphatase 2 (Dusp2; also called Phosphatase of activated cells 1, PAC1) is highly expressed in activated immune cells. We examined whether a potential inhibitor of Dusp2, salubrinal, prevents inflammatory cytokine expression in immune cells and arthritic responses in a mouse model of anti-collagen antibody-induced arthritis (CAIA). Salubrinal is a synthetic chemical that inhibits de-phosphorylation of eukaryotic translation initiation factor 2 alpha (eIF2α). In this study, we examined the effects of salubrinal on expression of inflammation linked genes as well as a family of DUSP genes using genome-wide microarrays, qPCR, and RNA interference. We also evaluated the effects of salubrinal on arthritic responses in CAIA mice using clinical and histological scores. The results revealed that salubrinal decreased inflammatory gene expression in macrophages, T lymphocytes, and mast cells. Dusp2 was suppressed by salubrinal in LPS-activated macrophages as well as PMA/ionomycin-activated T lymphocytes and mast cells. Furthermore, a partial silencing of Dusp2 downregulated IL1β and Cox2, and the inflammatory signs of CAIA mice were significantly suppressed by salubrinal. Collectively, this study presents a novel therapeutic possibility of salubrinal for inflammatory arthritis such as RA through inhibition of Dusp2.

Keywords

CAIA; Dusp2 (PAC1); Inflammation; Microarray; Salubrinal.

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