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Daily oral administration of low-dose methotrexate has greater antirheumatic effects in collagen-induced arthritis
Aoi Koyama1, Aki Tanaka1, Hideto To1
1Department of Medical Pharmaceutics, Graduate School of Medicine and Pharmaceutical Sciences for Research, University of Toyama, Toyama, Japan.
Objectives:
Methotrexate (MTX) is administered once or thrice weekly to patients with rheumatoid arthritis (RA). Even though RA continually progresses, MTX is not administered daily. Therefore, we investigated whether the daily administration of a low dose of MTX inhibits the progression of arthritis in collagen-induced arthritis (CIA) rats.
Methods:
Methotrexate was orally administered once weekly, thrice weekly and once daily to CIA rats, and arthritis scores were measured.
Key Findings:
When the same dose of MTX was administered, the exacerbation of arthritis was inhibited significantly more in the once-daily group than in the other groups. When the dose in the once-daily group was reduced to one-fourth that of the current standard dosing method, arthritis scores were markedly lower in the once-daily group than in the once and thrice-weekly groups.
Conclusions:
The daily administration of a low dose of MTX not only maintained normal levels that estimated adverse effects but also suppressed the progression of arthritis significantly more than the current standard dosing method. The results indicate that the reconsideration of dosing schedules based on the characteristics of MTX will lead to more effective RA therapy than that currently used in clinical practice.
Insights
Daily low-dose methotrexate (MTX) significantly improved collagen-induced arthritis in rats compared to standard weekly dosing. This suggests daily MTX may offer a more effective treatment for rheumatoid arthritis (RA).
Area of Science:
- Pharmacology
- Immunology
- Rheumatology
Background:
- Rheumatoid arthritis (RA) is a chronic autoimmune disease characterized by progressive joint inflammation.
- Methotrexate (MTX) is a cornerstone therapy for RA, typically administered weekly.
- Current RA treatment protocols do not utilize daily MTX, despite RA's progressive nature.
Purpose of the Study:
- To investigate the efficacy of daily low-dose MTX in inhibiting arthritis progression.
- To compare daily MTX administration with standard once or thrice-weekly dosing in a collagen-induced arthritis (CIA) rat model.
Main Methods:
- Oral administration of MTX at different frequencies (once weekly, thrice weekly, once daily) to CIA rats.
- Quantification of arthritis severity through regular measurement of arthritis scores.
Main Results:
- Once-daily MTX administration demonstrated significantly greater inhibition of arthritis exacerbation compared to weekly schedules at equivalent total doses.
- Even at one-fourth the standard dose, once-daily MTX resulted in markedly lower arthritis scores than once or thrice-weekly administration.
- Daily low-dose MTX maintained acceptable levels for estimated adverse effects.
Conclusions:
- Daily low-dose MTX is more effective in suppressing arthritis progression in CIA rats than current standard weekly dosing.
- Revisiting MTX dosing schedules based on its pharmacokinetic properties could enhance RA therapeutic outcomes.
- This study suggests a potential paradigm shift towards daily MTX administration for improved RA management.
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