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Food, herbs & supplements · health · Emerging
Traditional Chinese Herb Extract Eases Joint Damage In Mice With Rheumatoid Arthritis
Mouse study, not humanMatched MTX drug effectTargets immune cell switchGut bacteria shifted too
A flavonoid extract from the traditional Chinese medicine herb Rhizoma Drynariae reduced arthritis severity, joint swelling and bone damage in mice with collagen-induced arthritis, a lab model of rheumatoid arthritis, according to a study published in Pharmaceuticals on October 8, 2026.
Researchers tested total flavonoids of Rhizoma Drynariae (TFRD) in mice with collagen-induced arthritis, a standard lab model used to study rheumatoid arthritis. Sample size was not reported in the abstract. TFRD treatment reduced arthritis severity scores and lessened joint swelling and bone destruction compared with untreated arthritic mice. The high dose of TFRD produced effects broadly similar to methotrexate (MTX), a standard rheumatoid arthritis drug, in these mice. In joint tissue, TFRD lowered the proportion of pro-inflammatory macrophages (immune cells that drive tissue damage when overactive) and reduced levels of HIF-1α, a protein that helps cells adapt to low oxygen and ramp up inflammatory activity. In a lab dish, TFRD blocked bacterial-toxin-triggered macrophages from shifting into their inflammatory form. Gut bacteria analysis using 16S rRNA sequencing, a method that identifies bacterial species from genetic material, showed TFRD partly corrected an imbalanced gut microbial community and increased the relative abundance of Parabacteroides, a type of gut bacteria.
The researchers report that TFRD worked by lowering glycolytic metabolism, a process where cells rapidly burn sugar for quick energy, in the inflammatory macrophages, and by downregulating HIF-1α during that process. When the researchers forced HIF-1α levels back up in these cells, the anti-inflammatory effects of TFRD were partly reversed, which the authors say supports HIF-1α as part of the mechanism. In plain terms, inflammatory macrophages switch to a fast, inefficient sugar-burning mode to fuel their attack response, and HIF-1α acts as a control switch for that shift; the findings suggest TFRD works partly by turning that switch down rather than by broadly suppressing immune function the way some arthritis drugs do.
The therapeutic efficacy of high-dose TFRD (TFRD-H) was broadly similar to that of MTX in CIA mice.
Data Panel
- Who
- Mice with collagen-induced arthritis (a lab model of rheumatoid arthritis); sample size not reported
- Design
- Collagen-induced arthritis (CIA) mouse model given TFRD in vivo, with a macrophage polarization model and 16S rRNA gut bacteria sequencing
- Dose
- High-dose TFRD (TFRD-H) compared with low-dose TFRD and with the drug methotrexate (MTX); exact doses not reported in the abstract
- Primary result
- TFRD reduced arthritis severity scores, joint swelling and bone destruction in CIA mice; high-dose TFRD effects were broadly similar to MTX
- Secondary
- TFRD lowered the proportion of pro-inflammatory macrophages and HIF-1α expression in joint tissue; forcing HIF-1α back up partly reversed the anti-inflammatory effect; gut dysbiosis was mitigated with increased relative abundance of Parabacteroides
- Funding / conflicts
- Funding and conflicts not reported in the abstract
This is an animal study in mice with sample size not reported, and no human trial has tested this extract for rheumatoid arthritis. Funding and conflicts were not reported in the abstract.
Dr. Axe's Take
Rhizoma Drynariae has a long history in traditional Chinese medicine for bone and joint support, and this mouse study gives a mechanistic reason why: it appears to recalibrate how inflammatory immune cells fuel themselves rather than blunting the immune system wholesale. That distinction matters since methotrexate suppresses immune function broadly, with real tradeoffs. I would not treat this as a replacement for prescribed arthritis medication, and anyone on one should keep taking it as prescribed. The gut microbiome shift toward more Parabacteroides fits a broader pattern linking gut health to autoimmune disease. I want human trials before drawing conclusions about dosing or clinical use.
— Dr. Axe