Polyphyllin VII Alleviates Rheumatoid Arthritis by Reducing Oxidative Stress and Inflammation Through Downregulation...

Area of Science:

• Biochemistry
• Immunology
• Pharmacology

Background:

• Rheumatoid arthritis (RA) is a chronic inflammatory joint disease characterized by synovial inflammation and joint damage.
• Polyphyllin VII (PP7) is known for its potent anti-inflammatory properties.
• The anti-RA efficacy of PP7 remains largely unexplored.

Purpose of the Study:

• To investigate the potential anti-rheumatoid arthritis (RA) effects of polyphyllin VII (PP7).
• To explore the underlying mechanisms of PP7's action in an adjuvant-induced arthritis (AIA) rat model and fibroblast-like synoviocytes (FLSs).

Main Methods:

• An adjuvant-induced arthritis (AIA) rat model was established to evaluate PP7's protective effects.
• Oxidative stress and inflammation were assessed using commercial kits and RT-PCR.
• Ribonucleotide reductase regulatory subunit M2 (RRM2) expression was analyzed via western blotting in both in vivo and in vitro models.

Main Results:

• PP7 administration significantly reduced paw swelling and improved histological scores in AIA rats.
• PP7 treatment inhibited oxidative stress and inflammatory markers in AIA rat tissues and TNF-α-stimulated FLSs.
• RRM2 was identified as a downstream target of PP7, and its overexpression diminished PP7's protective effects in FLSs.

Conclusions:

• Polyphyllin VII (PP7) exhibits significant anti-rheumatoid arthritis (RA) activity.
• PP7 exerts its therapeutic effects by inhibiting oxidative stress and inflammation, partly through the modulation of RRM2 expression.
• These findings suggest PP7 holds promise as a potential therapeutic agent for treating RA.