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Methotrexate chronotherapy is effective against rheumatoid arthritis
Hideto To1, Hiromichi Yoshimatsu, Mari Tomonari
1Department of Medical Pharmaceutics, Graduate School of Medicine and Pharmaceutical Sciences for Research, University of Toyama, Japan. hide-to@umin.net
Chronobiology International
|April 2, 2011
Summary
Methotrexate chronotherapy, administered at bedtime, significantly improved rheumatoid arthritis (RA) symptoms and patient function. This timing aligns with natural 24-hour rhythms of inflammation, offering a safer and more effective treatment approach for RA patients.
Area of Science:
- Immunology
- Chronobiology
- Rheumatology
Background:
- Rheumatoid arthritis (RA) pathogenesis involves cytokines with 24-hour rhythms.
- Methotrexate (MTX) is a primary RA treatment, but its efficacy can be time-dependent.
- Previous studies indicated MTX effectiveness when synchronized with circadian rhythms in animal models.
Purpose of the Study:
- To investigate the efficacy of MTX chronotherapy in Japanese RA patients.
- To determine if administering MTX at bedtime optimizes treatment outcomes based on TNF-α rhythms.
- To assess improvements in disease activity and functional capacity, and evaluate safety.
Main Methods:
- Animal study: MRL/lpr mice (RA model) assessed for TNF-α mRNA rhythm and MTX effects at different dosing times (6 or 18 HALO).
- Human study: Japanese RA patients switched from standard MTX to once-daily bedtime MTX chronotherapy.
- Clinical assessments included Disease Activity Score (DAS)28, modified health assessment questionnaire (MHAQ), and adverse effects over 3 months.
Main Results:
- In mice, MTX at 18 HALO (when TNF-α began increasing) significantly reduced inflammation and TNF-α.
- RA patients on MTX chronotherapy showed significant DAS28 improvement at 1, 2, and 3 months.
- 41.2% of patients experienced symptom recovery, 23.5% achieved remission, and MHAQ scores improved markedly with no severe adverse effects.
Conclusions:
- MTX chronotherapy timed with biological rhythms is effective in reducing inflammation in an RA mouse model.
- Bedtime MTX chronotherapy is a safe and effective treatment for Japanese RA patients, improving disease activity and functional capacity.
- This chronotherapeutic approach offers a superior alternative to standard MTX dosing for managing rheumatoid arthritis.
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