Hydrangenol was isolated from Hydrangea macrophylla.
Hydrangenol inhibits LPS-induced nitric oxide production possibly by regulating iNOS expression in BV2 microglial cells.
Hydrangenol downregulates iNOS expression by suppressing NF-κB activity.
Nrf2-meidated HO-1 expression plays an important role in hydrangenol-mediated NO production.