Turmeric extracts containing curcuminoids prevent experimental rheumatoid arthritis

Area of Science:

• Pharmacology
• Immunology
• Natural Products Chemistry

Background:

• Turmeric is traditionally used in Ayurvedic medicine for inflammatory conditions like arthritis.
• Western use of turmeric supplements for arthritis lacks robust scientific validation.
• Existing research has not evaluated complex turmeric extracts similar to dietary supplements.

Purpose of the Study:

• To investigate the in vivo antiarthritic efficacy of well-characterized turmeric extracts.
• To assess the preventive and therapeutic potential of turmeric extracts in a rheumatoid arthritis model.
• To identify the active compounds responsible for the antiarthritic effects of turmeric.

Main Methods:

• Streptococcal cell wall (SCW)-induced arthritis model in animals, a model for rheumatoid arthritis.
• Administration of turmeric extracts before and after the onset of joint inflammation.
• Assessment of joint swelling using the arthritic index as the primary endpoint.

Main Results:

• An essential oil-depleted turmeric fraction (41% curcuminoids) prevented joint inflammation when administered preventatively.
• A highly purified turmeric extract (94% curcuminoids) demonstrated greater potency in preventing arthritis.
• The timing of administration was crucial; preventative treatment was effective, but therapeutic treatment was not.

Conclusions:

• Turmeric extracts possess in vivo antiarthritic efficacy.
• The three major curcuminoids in turmeric are likely responsible for the observed antiarthritic effect.
• Other compounds present in crude turmeric extracts may diminish the antiarthritic properties of curcuminoids.