Although there was no significant upregulation in the mRNA levels of pro-inflammatory cytokines in the DRG between the two groups, we observed that the upregulated levels of pain-related mRNAs, such as TRPV-1, BDNF, and SP (almost significant) were suppressed by MTX administration.
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Efficacy of Methotrexate on Rat Knee Osteoarthritis Induced by Monosodium Iodoacetate.
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Although we did not find the main group effect in lifting behavior, the MTX group showed a trend of increased lifting compared to the vehicle group at week 4, which implies a positive effect of MTX on physical function during OA progression.
The upregulation level of SP mRNA (P=0.06) was almost significantly suppressed in the MTX group compared with the vehicle group ( Figure 7 ).