Trioxsalen (200 nM) plus 365 nm light produce DNA crosslinks but not breaks in mouse L1210 leukemia cells. Trioxsalen/UVA treatment of HaCaT keratinocytes induces NFkappaB binding activity, and that this is a synergistic effect. Trioxsalen shows anti-inflammatory capacities in vitro.
Trioxsalen induces dose-dependent depletion of ATPase-positive LCs, with a maximal depletion of 80%, in oral mucous membrane (OMM) with PUVA (UVA doses of 1-8 J/cm2) in rat.