Necessity of lysophosphatidic acid receptor 1 for development of arthritis

Yoshishige Miyabe, Chie Miyabe, Yoshiko Iwai, Aiko Takayasu, Shin Fukuda, Waka Yokoyama, Jun Nagai, Masahiro Jona, Yasunori Tokuhara, Ryunosuke Ohkawa, Harald M. Albers, Huib Ovaa, Junken Aoki, Jerold Chun, Yutaka Yatomi, Hiroshi Ueda, Masayuki Miyasaka, Nobuyuki Miyasaka, Toshihiro Nanki

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)


Objective Lysophosphatidic acid (LPA) is a bioactive lipid that binds to a group of cell surface G protein-coupled receptors (LPA receptors 1-6 [LPA 1-6]) and has been implicated as an important mediator of angiogenesis, inflammation, and cancer growth. This study was undertaken to analyze the effects of LPA1 on the development of arthritis. Methods Expression of LPA receptors on synovial tissue was analyzed by immunohistochemistry and quantitative reverse transcription-polymerase chain reaction. The effects of abrogation of LPA1 on collagen-induced arthritis (CIA) were evaluated using LPA1-deficient mice or LPA 1 antagonist. Migrating fluorescence-labeled CD11b+ splenocytes, which were transferred into the synovium of mice with CIA, were counted. CD4+ naive T cells were incubated under Th1-, Th2-, or Th17-polarizing conditions, and T helper cell differentiation was assessed. Osteoclast formation from bone marrow cells was examined. Results LPA1 was highly expressed in the synovium of patients with rheumatoid arthritis (RA) compared with that of patients with osteoarthritis. LPA1-deficient mice did not develop arthritis following immunization with type II collagen (CII). LPA1 antagonist also ameliorated murine CIA. Abrogation of LPA1 was associated with reductions in cell infiltration, bone destruction in the joints, and interleukin-17 production from CII-stimulated splenocytes. Infiltration of transferred CD11b+ macrophages from LPA1-deficient mice into the synovium was suppressed compared with infiltration of macrophages from wild-type mice. LPA1 antagonist inhibited the infiltration of macrophages from wild-type mice. Differentiation into Th17, but not Th1 or Th2, and osteoclast formation were also suppressed under conditions of LPA1 deficiency or LPA1 inhibition in vitro. Conclusion Collectively, these results indicate that LPA/LPA1 signaling contributes to the development of arthritis via cellular infiltration, Th17 differentiation, and osteoclastogenesis. Thus, LPA1 may be a promising target molecule for RA therapy.

Original languageEnglish
Pages (from-to)2037-2047
Number of pages11
JournalArthritis and Rheumatism
Issue number8
Publication statusPublished - 2013 Aug

ASJC Scopus subject areas

  • Immunology and Allergy
  • Rheumatology
  • Immunology
  • Pharmacology (medical)


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