Abstract | BACKGROUND:
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. METHODS: RESULTS: 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. CONCLUSIONS: 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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Authors | Atsuo Tanimoto, Yuichi Shinozaki, Keisuke Nozawa, Yukari Kimoto, Wataru Amano, Akira Matsuo, Takayuki Yamaguchi, Mutsuyoshi Matsushita |
Journal | BMC musculoskeletal disorders
(BMC Musculoskelet Disord)
Vol. 16
Pg. 339
(Nov 06 2015)
ISSN: 1471-2474 [Electronic] England |
PMID | 26546348
(Publication Type: Journal Article)
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Chemical References |
- Anti-Inflammatory Agents
- Biomarkers
- Inflammation Mediators
- Interleukin-6
- Protein Kinase Inhibitors
- Freund's Adjuvant
- Janus Kinases
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Topics |
- Administration, Oral
- Animals
- Anti-Inflammatory Agents
(administration & dosage, pharmacology)
- Arthritis, Experimental
(chemically induced, drug therapy, enzymology, physiopathology, psychology)
- Behavior, Animal
(drug effects)
- Biomarkers
(blood)
- Dose-Response Relationship, Drug
- Drug Administration Schedule
- Freund's Adjuvant
- Hyperalgesia
(enzymology, physiopathology, prevention & control)
- Inflammation Mediators
(blood)
- Interleukin-6
(blood)
- Janus Kinases
(antagonists & inhibitors, metabolism)
- Joints
(drug effects, enzymology, physiopathology)
- Male
- Motor Activity
(drug effects)
- Protein Kinase Inhibitors
(administration & dosage, pharmacology)
- Rats, Inbred Lew
- Signal Transduction
(drug effects)
- Time Factors
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