title: Magnolia ovovata extract and its active component magnolol prevent skin photoaging via inhibition of nuclear factor kappaB.
abstract: Transcriptional activity of nuclear factor kappaB (NF-kappaB) is induced by environmental signals including inflammation, UV irradiation and oxidative stress. It was shown that the NF-kappaB activity greatly contributes to the skin photoaging process. Thus, it is plausible that NF-kappaB inhibitors could directly prevent skin photoaging. In this study, we found that Magnolia ovovata extract inhibited NF-kappaB-mediated gene expression and demonstrated that external swabbing with Magnolia extract preventing skin photoaging processes through keratinocyte hyperproliferation and degradation of collagen fibers in mice skin. We have identified magnolol as the solely responsible active compound in Magnolia extract. Magnolol effectively inhibited the NF-kappaB-dependent transcription, but no effect was observed with other inducible transcription factors such as activator protein-1 (AP-1) and cyclic-AMP responsive element-binding protein (CREB). In addition, magnolol was effective in inhibiting the production of basic fibroblast growth factor (bFGF) and matrix metalloprotease-1 (MMP-1) from the cells overexpressing p65, a major subunit of NF-kappaB. Although magnolol did not affect the phosphorylation and degradation of IkappaBalpha, it inhibited the nuclear translocation of the activated NF-kappaB. These findings suggest that Magnolia extract and its active component magnolol can be used to prevent the skin photoaging via inhibiting NF-kappaB by external topical application.
authors.affiliation: Department of Molecular and Cellular Biology, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, Aichi 467-8601, Japan.
authors.forename: Kiyotaka
authors.initials: K
authors.lastname: Tanaka
authors.forename: Junichi
authors.initials: J
authors.lastname: Hasegawa
authors.forename: Kaori
authors.initials: K
authors.lastname: Asamitsu
authors.forename: Takashi
authors.initials: T
authors.lastname: Okamoto
mesh_terms: D000818:Animals; D001713:Biphenyl Compounds / Q000494:pharmacology*; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D003094:Collagen / Q000378:metabolism; D004817:Epidermis / Q000187:drug effects / Q000473:pathology / Q000528:radiation effects; D016222:Fibroblast Growth Factor 2 / Q000096:biosynthesis; D006801:Humans; D017705:Lignans / Q000494:pharmacology*; D031566:Magnolia / Q000737:chemistry*; D008297:Male; D020781:Matrix Metalloproteinase 1 / Q000096:biosynthesis; D051379:Mice; D008812:Mice, Hairless; D016328:NF-kappa B / Q000037:antagonists & inhibitors*; D010936:Plant Extracts / Q000494:pharmacology*; D015595:Skin Aging / Q000187:drug effects*; D014466:Ultraviolet Rays
chemical_list: D001713:Biphenyl Compounds; D017705:Lignans; D016328:NF-kappa B; D010936:Plant Extracts; C005498:magnolol; D016222:Fibroblast Growth Factor 2; D003094:Collagen; D020781:Matrix Metalloproteinase 1