Isoflavonoid-Rich Flemingia macrophylla Extract Attenuates UVB-Induced Skin Damage by Scavenging Reactive Oxygen Species and Inhibiting MAP Kinase and MMP Expression

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Abstract

In this study, we investigated the antioxidant activity and anti-photoaging properties of an extract of Flemingia macrophylla, a plant rich in isoflavonoid content. Pretreatment of fibroblasts with Flemingia macrophylla extract (FME) inhibited elastase activity, promoted the protein expression of type I procollagen, and attenuated the phosphorylation of mitogen-activated protein (MAP) kinase and the protein expression of matrix-metalloproteinase- (MMP-) 1, 3, and 9. The IC ₅₀ values were 2.1 μ g/mL for DPPH radical scavenging ability, 366.8 μ g/mL for superoxide anion scavenging ability, 178.9 μ g/mL for hydrogen peroxide scavenging ability, and 230.9 μ g/mL for hydroxyl radical scavenging ability. Also, exposure of erythrocytes to various concentrations of FME (50–500 μ g/mL) resulted in a dose- and time-dependent inhibition of AAPH-induced hemolysis. In human fibroblasts, FME at 10 μ g/mL was shown to be a potent scavenger of UV-induced reactive oxygen species (ROS). The antioxidant and anti-photoaging properties of FME make it an ideal anti-intrinsic aging and anti-photoaging agent.

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Most cited references 32

Record: found
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Article: not found

Prevention of cytotoxicity and inhibition of intercellular communication by antioxidant catechins isolated from Chinese green tea.

R Ruch, S. Cheng, J E Klaunig (1989)

An antioxidant fraction of Chinese green tea (green tea antioxidant; GTA), containing several catechins, has been previously shown to inhibit 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced tumor promotion in mouse skin. In the present study, GTA was shown to have antioxidative activity toward hydrogen peroxide (H2O2) and the superoxide radical (O2-). GTA also prevented oxygen radical and H2O2-induced cytotoxicity and inhibition of intercellular communication in cultured B6C3F1 mouse hepatocytes and human keratinocytes (NHEK cells). GTA (0.05-50 micrograms/ml) prevented the killing of hepatocytes (measured by lactate dehydrogenase release) by paraquat (1-10 mM) and glucose oxidase (0.8-40 micrograms/ml) in a concentration-dependent fashion. GTA (50 micrograms/ml) also prevented the inhibition of hepatocyte intercellular communication by paraquat (5 mM), glucose oxidase (0.8 micrograms/ml), and phenobarbital (500 micrograms/ml). In addition, GTA (50 micrograms/ml) prevented the inhibition of intercellular communication in human keratinocytes by TPA (100 ng/ml). Cytotoxicity and inhibition of intercellular communication, two possible mechanisms by which tumor promoters may produce their promoting effects were therefore prevented by GTA. The inhibition of these two effects of pro-oxidant compounds may suggest a mechanism by which GTA inhibits tumor promotion in vivo.

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Record: found
Abstract: found
Article: not found

Pathophysiology of premature skin aging induced by ultraviolet light.

G Fisher, Z. Wang, S Datta … (1997)

Long-term exposure to ultraviolet irradiation from sunlight causes premature skin aging (photoaging), characterized in part by wrinkles, altered pigmentation, and loss of skin tone. Photoaged skin displays prominent alterations in the collagenous extracellular matrix of connective tissue. We investigated the role of matrix-degrading metalloproteinases, a family of proteolytic enzymes, as mediators of collagen damage in photoaging. We studied 59 whites (33 men and 26 women, ranging in age from 21 to 58 years) with light-to-moderate skin pigmentation, none of whom had current or prior skin disease. Only some of the participants were included in each of the studies. We irradiated their buttock skin with fluorescent ultraviolet lights under standard conditions and obtained skin samples from irradiated and nonirradiated areas by keratome or punch biopsy. In some studies, tretinoin and its vehicle were applied to skin under occlusion 48 hours before ultraviolet irradiation. The expression of matrix metalloproteinases was determined by in situ hybridization, immunohistology, and in situ zymography. Irradiation-induced degradation of skin collagen was measured by radioimmunoassay of soluble cross-linked telopeptides. The protein level of tissue inhibitor of matrix metalloproteinases type 1 was determined by Western blot analysis. A single exposure to ultraviolet irradiation increased the expression of three matrix metalloproteinases -- collagenase, a 92-kd gelatinase, and stromelysin -- in skin connective tissue and outer skin layers, as compared with nonirradiated skin. The degradation of endogenous type I collagen fibrils was increased by 58 percent in irradiated skin, as compared with nonirradiated skin. Collagenase and gelatinase activity remained maximally elevated (4.4 and 2.3 times, respectively) for seven days with four exposures to ultraviolet irradiation, delivered at two-day intervals, as compared with base-line levels. Pretreatment of skin with tretinoin (all-trans-retinoic acid) inhibited the induction of matrix metalloproteinase proteins and activity (by 70 to 80 percent) in both connective tissue and outer layers of irradiated skin. Ultraviolet irradiation also induced tissue inhibitor of matrix metalloproteinases-1, which regulates the enzyme. Induction of the inhibitor was not affected by tretinoin. Multiple exposures to ultraviolet irradiation lead to sustained elevations of matrix metalloproteinases that degrade skin collagen and may contribute to photoaging. Treatment with topical tretinoin inhibits irradiation-induced matrix metalloproteinases but not their endogenous inhibitor.

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UV-light-induced signal cascades and skin aging.

L Rittié (2002)

UV irradiation acts as a broad activator of cell surface growth factor and cytokine receptors. This ligand-independent receptor activation induces multiple downstream signaling pathways that regulate expression of multiple genes. These signaling pathways converge to stimulate transcription factor AP-1. Among genes whose expression is regulated by AP-1 are several matrix-metalloproteinase (MMP) family members and type I procollagen. UV-enhanced matrix degradation is accompanied with decreased collagen production mediated not only by activation of AP-1, but also by inhibition of transforming growth factor (TGF)-beta signaling. Several alterations to skin connective tissue that occur during aging are mediated by mechanisms that are similar to those that occur in response to UV irradiation. Thus, skin aging is associated with increased AP-1 activity, increased MMP expression, impaired TGF-beta signaling, enhanced collagen degradation, and decreased collagen synthesis. Knowledge gained from examining molecular responses of human skin to UV irradiation provides not only a framework for understanding mechanisms involved in skin aging, but also may help in development of new clinical strategies to impede chronological and UV-induced skin aging.

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Author and article information

Journal

Journal ID (nlm-ta): Evid Based Complement Alternat Med

Journal ID (iso-abbrev): Evid Based Complement Alternat Med

Journal ID (publisher-id): ECAM

Title: Evidence-based Complementary and Alternative Medicine : eCAM

Publisher: Hindawi Publishing Corporation

ISSN (Print): 1741-427X

ISSN (Electronic): 1741-4288

Publication date (Print): 2013

Publication date (Electronic): 1 July 2013

Publication date PMC-release: 1 July 2013

Volume: 2013

Electronic Location Identifier: 696879

Affiliations

¹Department of Cosmeceutics, China Medical University, Taichung 404, Taiwan

²Center for Biomedical Technology Research and Development, Fooyin University, Kaohsiung 831, Taiwan

³Brion Research Institute of Taiwan, Taipei 231, Taiwan

Author notes

*Hsiu-Mei Chiang: hmchiang@ 123456mail.cmu.edu.tw and

*Kuo-Ching Wen: kcwen0520@ 123456mail.cmu.edu.tw

Academic Editor: Gloria Brusotti

Article

DOI: 10.1155/2013/696879

PMC ID: 3713360

PubMed ID: 23935672

SO-VID: 24733908-9bc8-4d91-b9ac-df1eaa177536

License:

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

History

Date received : 26 March 2013

Date accepted : 3 June 2013

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