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01.12.2015 | Research article | Ausgabe 1/2015 Open Access

BMC Musculoskeletal Disorders 1/2015

Improvement of spontaneous locomotor activity with JAK inhibition by JTE-052 in rat adjuvant-induced arthritis

BMC Musculoskeletal Disorders > Ausgabe 1/2015
Atsuo Tanimoto, Yuichi Shinozaki, Keisuke Nozawa, Yukari Kimoto, Wataru Amano, Akira Matsuo, Takayuki Yamaguchi, Mutsuyoshi Matsushita
Wichtige Hinweise

Competing interests

All authors of this paper are employees of Japan Tobacco Inc. The authors declare that they have no competing interests.

Authors’ contributions

NK, YK, YS, and AT performed most experiments. AT, YS, TY, and MM designed the study, interpreted the findings, and wrote the manuscript. WA and AM assisted with interpretation of the findings. All authors have read and approved the manuscript.



Rheumatoid arthritis (RA) is a chronic inflammatory disease that leads to joint destruction, disability, and decreased quality of life (QOL). Inhibition of Janus kinase (JAK) signaling ameliorates articular inflammation and joint destruction in animal models of RA, but its effects on behaviors indicating well-being are poorly understood. In this study, we evaluated the effect of JAK inhibition on spontaneous locomotor activity in rats with adjuvant-induced arthritis, a rodent model of RA.


Arthritis was induced in male Lewis rats by a single subcutaneous injection of Freund’s complete adjuvant. The novel JAK inhibitor JTE-052 was orally administered for 7 days after the onset of arthritis.


Induction of arthritis suppressed the spontaneous locomotor activity of the rats. Administration of JTE-052 completely improved the spontaneous locomotor activity, with partial reductions in articular inflammation and joint destruction. Hyperalgesia and motor functions were also improved, but the efficacy was not complete. However, serum interleukin (IL)-6 levels were completely decreased at 4 h after administration of the first dose of JTE-052.


This study demonstrated that JAK inhibition improved the spontaneous locomotor activity of rats with adjuvant-induced arthritis, in association with amelioration of pain and physical dysfunction as a consequence of suppression of joint inflammation. Moreover, although further studies are needed, there was possible participation of IL-6 downregulation in the improvement of locomotor activity by JAK inhibition.
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