Gingko biloba extract reduces VEGF and CXCL-8/IL-8 levels in keratinocytes with cumulative effect with epigallocatechin-3-gallate.
In skin inflammation, vascular endothelial growth factor (VEGF) and CXCL-8/IL-8 play an important role and are produced by activated keratinocytes. Extracts from Ginkgo biloba leaves (GBE), widely used in phytotherapy, have been reported to exert antioxidant and anti-inflammatory properties in the skin. We therefore evaluated the effects of GBE on the release of VEGF and CXCL8/IL-8 by normal human keratinocytes (NHKs) activated by tumor necrosis factor alpha (TNFalpha). Moreover, as we previously showed that epigallocatechin-3-gallate (EGCG) reduces VEGF and CXCL8/IL-8 secretion in TNFalpha-activated NHKs, we also tested its effect in association with GBE. Our results showed that GBE exerted a potent inhibition on VEGF and CXCL8/IL-8 levels in activated cells. In association with EGCG, GBE down-regulated VEGF and CXCL8/IL-8 levels in a cumulative manner in TNFalpha-stimulated NHKs. These results suggest that GBE, alone or in association with EGCG may contribute to moderate inflammatory processes in skin diseases associated with angiogenesis.
Trompezinski
Sandra
S
Université de Lyon, Hôpital E. Herriot, Lyon, France. s.trompezinski@dipta.fr
Bonneville
Marlène
M
Pernet
Ingrid
I
Denis
Alain
A
Schmitt
Daniel
D
Viac
Jacqueline
J
D000893:Anti-Inflammatory Agents / Q000494:pharmacology*; D002392:Catechin / Q000031:analogs & derivatives* / Q000494:pharmacology; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D004305:Dose-Response Relationship, Drug; D015536:Down-Regulation; D020441:Ginkgo biloba; D006801:Humans; D016209:Interleukin-8 / Q000378:metabolism*; D015603:Keratinocytes / Q000187:drug effects* / Q000378:metabolism; D008297:Male; D010936:Plant Extracts / Q000494:pharmacology*; D018515:Plant Leaves; D013997:Time Factors; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism; D042461:Vascular Endothelial Growth Factor A / Q000378:metabolism*
D000893:Anti-Inflammatory Agents; C508606:CXCL8 protein, human; D016209:Interleukin-8; D010936:Plant Extracts; D014409:Tumor Necrosis Factor-alpha; C467484:VEGFA protein, human; D042461:Vascular Endothelial Growth Factor A; D002392:Catechin; C045651:epigallocatechin gallate