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BIOCHEMICAL INVESTIGATION AND GENE ANALYSIS OF EQUOL: A PLANT AND SOY-DERIVED ISOFLAVONOID WITH ANTIAGING AND ANTIOXIDANT PROPERTIES WITH POTENTIAL HUMAN SKIN APPLICATIONS.

Gopaul1, R., Knaggs1, H.E. and Lepha2, E.D.  1Nu Skin Enterprises, Personal Care Products Division, Provo, Utah, USA. 2Department of Physiology and Developmental Biology and The Neuroscience Center, Brigham Young University, Provo, Utah, USA.
Abstract

The purpose of this study was to investigate the effects of equol, a plant and intestinal flora derived isoflavonoid molecule on the expression of skin genes and proteins using human dermal models. As equol has been shown to mimic 17β-estradiol and bind specifically to 5α-dihydrotestosterone (5α-DHT), these agents were used (in addition to equol) to determine whether equol may play important and beneficial roles in the extracellular matrix (ECM). Equol at 0.3 or 1.2% in qPCR experiments using a human skin barrier model examined ECM gene expression. Equol, 5α-DHT, and 17β­ estradiol at 10 nM were studied in human monolayer fibroblasts cultures {hMFC) for ECM protein expression. Human fibroblast three-dimensional organotypic cultures revealed equol’s influence (@ 10 nM) on ECM proteins via fluorescent-activated cell sorting (FACS) analysis. In qPCR experiments, equol significantly increased collagen, elastin (ELN), and tissue inhibitor of metalloprotease and decreased metalloproteinases (MMPs) gene expression and caused significant positive changes in skin antioxidant and antiaging genes. In hMFC, equol significantly increased collagen type I (COL1A1), whereas, 5α-DHT significantly decreased cell viability that was blocked by equol. FACS analysis showed equol and 17β –estradiol significantly stimulated COL1A1, collagen type Ill (COL3A1), and ELN while MMPs were significantly decreased compared with control values. Finally, tamoxifen blocked the positive influences of equol on ECM proteins via FACS analysis. These findings suggest that equol has the potential to be used topically for the treatment and prevention of skin aging, by enhancing ECM components in human skin.

Keywords

5α dihydrotestosterone, Antioxidants, COL1A1, COL3A1, Collagen 4a2, Collagen 7a1, EFT-400, Elastase, Elastin, Extracellular matrix, Gene analysis, Metallothionein 1H, Metallothionein 2A, MMP1, MMP3, MMP9, PCNA, S100 calcium binding protein A8, S100 calcium binding protein A9, Skin aging, Steroid 5-alpha reductase 1, Superoxide dismutase 2, Thioredoxin reductase 1, TIMP1

Materials Tested

17-beta estradiol, DMSO, Equol, isoflavonoid, tamoxifen

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