Photoprotection against UVAR: effective triterpenoids require a lipid raft stabilizing chemical structure.

Abstract:

:UVA(Ultraviolet A)-induced gene expression is supposed to be a hallmark for inflammation, for immunosuppression and in long-term cancer formation. In previous studies, we have shown for keratinocytes that physiological doses of UVA radiation result in the upregulation of gene expression mediated by ceramide formation from sphingolipids/cholesterol-rich microdomains (rafts), which can be blocked by preloading keratinocytes with cholesterol or plant sterols. Here, we show that besides stigmasterol and ß-sitosterol, also sterols like 14-dehydroergosterol, ergosterol-peroxide and 29-norcycloartenol inhibit the UVA response. Moreover, we present evidence that natural material-derived triterpenoids such as oleanolic acid can abrogate UVA-induced gene expression by raft stabilization. This effect depends on the structure of the molecule, because its isomer ursolic acid also integrates within the rafts without inhibiting ceramide formation and upregulation of gene expression.

journal_name

Exp Dermatol

journal_title

Experimental dermatology

authors

Bayer M,Proksch P,Felsner I,Brenden H,Kohne Z,Walli R,Duong TN,Götz C,Krutmann J,Grether-Beck S

doi

10.1111/j.1600-0625.2011.01350.x

subject

Has Abstract

pub_date

2011-11-01 00:00:00

pages

955-8

issue

11

eissn

0906-6705

issn

1600-0625

journal_volume

20

pub_type

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