The parameters analyzed showed an antiinflammatory
action of lupeol in external
application both on skin and ear model. It reduced
erythema and local inflammation clear detectable
by non-invasive methods and histology
evaluations.
The application of TPA to mouse skin leads to
oedema, cellular infiltration and skin tumor
promotion. It is also suggested the participation of
arachidonate metabolites in the oedema formation
caused by TPA, and TPA has been shown to
induce PGE2 production from epidermal cells. We
have now demonstrated that TPA induces PGE2
production by the cells of the ear, and PGE2
content increased with the same time course as
oedema formation. Since cyclo-oxygenase
inhibitors such as indomethacin, aspirin and
naproxen have been shown to suppress TPAinduced
ear oedema, PGE2 is presumably a
mediator of TPA-induced oedema