Bioavailable constituents/metabolites of pomegranate (Punica granatum L) preferentially inhibit COX2 activity ex vivo and IL-1beta-induced PGE2 production in human chondrocytes in vitro

Shukla M, Gupta K, Rasheed Z, Khan KA, Haqqi TM · Journal of Inflammation (London)

Tests the step most polyphenol papers skip — whether anything that reaches the blood is still active. Post-dose plasma inhibited IL-1β-induced PGE2 and nitric oxide in chondrocytes and inhibited COX-1 and COX-2 activity, with the effect on COX-2 more pronounced; pre-dose plasma did not.

Population

Rabbit plasma taken before and 2 hours after oral pomegranate extract, applied to human chondrocytes and COX enzyme assays

Intervention

Plasma collected after oral pomegranate fruit extract

Comparator

Plasma collected before dosing

Limitations

Rabbit plasma, not human, and an ex-vivo readout — it shows bioactive material circulates after a dose, not that a joint is protected.