Biochemical investigation and gene analysis of equol: A plant and soy‐derived isoflavonoid with antiaging and antioxidant properties with potential human skin applications
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-dihydrotestostone (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 III (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.
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More than 100,000 women have used topically-applied equol with great success.
“more than 100,000 women have used topically-applied equol with great success [2,78,84,85].”
Equol stimulates antioxidant enzymes SOD2 and TXNRD1 in human skin.
“From gene array studies, equol has been shown to stimulate the following antioxidant enzymes in human skin, such as SOD 2 and thioredoxin reductase 1 (TXNRD 1) [84,85].”
Topical applications of equol have demonstrated improved human dermal parameters in in vitro, ex vivo, and in vivo studies.
“several reports using topical applications of equol have demonstrated improved human dermal parameters”
Topical equol treatment in human skin via gene array studies demonstrated that interleukin levels (IL-1, IL-6, IL-8) and cyclo-oxygenase 1 (COX-1) were significantly inhibited.
“topical equol treatment in human skin via gene array studies have demonstrated that interleukin (IL) levels were significantly inhibited (such as IL-I, IL-6, IL-8 as well as cyclo-oxygenase 1 (COX-1)) [84,85].”
In in vitro cell culture, organotypic cell cultures, and gene array studies, equol increases the gene and protein expression of collagen type I.
“Equol increases the gene and protein expression of collagen type I, elastin, and tissue inhibitor of matrix metalloproteinase 1 (TIMP 1).”
Equol increases tissue inhibitor of matrix metalloproteinase 1 (TIMP1) by 5.4-fold.
“along with increasing tissue inhibitor of matrix metalloproteinase 1 (TIMP 1) by 5.4-fold”
In in vitro cell culture, organotypic cell cultures, and gene array studies, equol increases the gene and protein expression of elastin.
“Equol increases the gene and protein expression of collagen type I, elastin, and tissue inhibitor of matrix metalloproteinase 1 (TIMP 1).”
Tumor necrosis factor receptor levels were significantly inhibited by equol when compared to controls.
“tumor necrosis factor receptor levels were significantly inhibited by equol when compared to controls [84,85].”
In in vitro cell culture, organotypic cell cultures, and gene array studies, equol increases the gene and protein expression of tissue inhibitor of matrix metalloproteinase 1 (TIMP 1).
“Equol increases the gene and protein expression of collagen type I, elastin, and tissue inhibitor of matrix metalloproteinase 1 (TIMP 1).”
Equol significantly increases gene and protein expression of collagen and elastin by approximately 2-fold.
“From gene array and human fibroblast cell culture experiments equol has been shown to significantly increase the gene and protein expression of collagen and elastin by approximately 2-fold”
In in vitro cell culture, organotypic cell cultures, and gene array studies, equol inhibits the gene and protein expression of matrix metalloproteinase 9 (MMP 9).
“Equol inhibits the gene and protein expression of elastase and the matrix metalloproteinases (MMP 1, MMP 3, and MMP 9).”
In in vitro cell culture, organotypic cell cultures, and gene array studies, equol inhibits the gene and protein expression of matrix metalloproteinase 3 (MMP 3).
“Equol inhibits the gene and protein expression of elastase and the matrix metalloproteinases (MMP 1, MMP 3, and MMP 9).”
In in vitro cell culture, organotypic cell cultures, and gene array studies, equol inhibits the gene and protein expression of elastase.
“Equol inhibits the gene and protein expression of elastase and the matrix metalloproteinases (MMP 1, MMP 3, and MMP 9).”
In in vitro cell culture, organotypic cell cultures, and gene array studies, equol inhibits the gene and protein expression of matrix metalloproteinase 1 (MMP 1).
“Equol inhibits the gene and protein expression of elastase and the matrix metalloproteinases (MMP 1, MMP 3, and MMP 9).”
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References 34 · Cited by 72
- Authors
- Gopaul, R., Knaggs, H. E., & Lephart, E. D.
- Affiliations
- Nu Skin (United States) (US)
- Brigham Young University (US)
- Corresponding author
- Gopaul, Remona
- ORCID
- Lephart, Edwin D.
- Venue
- BioFactors
- Publisher
- Wiley
- Published
- 2012-01
- Volume
- 38
- Issue
- 1
- Pages
- 44-52
- ISSN
- 0951-6433 (ISSN-L)
- 1872-8081
- OpenAlex
- W2077687626
- Cited by
- 72
- References
- 34
- Citations by year
- 2026: 4 · 2025: 3 · 2024: 2 · 2023: 5 · 2022: 7 · 2021: 4 · 2020: 6 · 2019: 5 · 2018: 9 · 2017: 6 · 2016: 5 · 2015: 4 · 2014: 6 · 2013: 6
- FWCI
- 6.41
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- BioFactors (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Dermatology › Skin Protection and Aging
- Health Sciences › Medicine › Pathology and Forensic Medicine › Phytoestrogen effects and research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bioactive natural compounds
- Keywords
- equol, isoflavonoids, skin aging, extracellular matrix, collagen, elastin, matrix metalloproteinases, tissue inhibitors of metalloproteinases, estradiol, dihydrotestosterone, tamoxifen, human dermal fibroblasts, skin barrier, antioxidant genes, topical skin care, gut microbiota
- MeSH terms
- Antioxidants, Cell Survival, Cells, Cultured, Estradiol, Fibroblasts, Humans, Receptors, Estrogen, Glycine max, Dihydrotestosterone, Transcription, Genetic, Skin Aging, Extracellular Matrix Proteins, Gene Expression Profiling, Collagen Type I, Tissue Culture Techniques, Cell Proliferation, Equol
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