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Chen J, Wang Y, Dai W, Xu X, Ni Q, Yi X, Kang P, Ma J, Wu L, Li C, Li S. Oxidative stress-induced hypermethylation and low expression of ANXA2R: Novel insights into the dysfunction of melanocytes in vitiligo. J Dermatol Sci 2024; 114:115-123. [PMID: 38806323 DOI: 10.1016/j.jdermsci.2024.02.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Revised: 01/30/2024] [Accepted: 02/27/2024] [Indexed: 05/30/2024]
Abstract
BACKGROUND Vitiligo is a skin disorder with melanocyte destruction caused by complex interplay between multiple genetic and environmental factors. Recent studies have suggested DNA methylation is involved in the melanocyte damage, but the underlying mechanism remains unknown. OBJECTIVE To explore the abnormal DNA methylation patterns in vitiligo lesional and nonlesional skin, and the mechanism of DNA methylation involved in vitiligo pathogenesis. METHODS Initially, the genome-wide aberrant DNA methylation profiles in lesional and nonlesional skin of vitiligo were detect via Illumina methylation EPIC 850k Beadchip. Subsequently, a comprehensive analysis was conduct to investigate the genomic characteristics of differentially methylated regions (DMRs). Furthermore, the effects of key aberrant methylated genes on cell apoptosis and function of both melanocytes and keratinocytes were further identified and validated by western bloting, ELISA, and immunofluorescence. RESULTS Compared with nonlesional skins, we discovered 79 significantly differentially methylated CpG sites in vitiligo lesions. These DMRs were mainly located in the gene body and the TS1500 region. Annexin A2 receptor (ANXA2R), a crucial gene in cell apoptosis, was hypermethylated in vitiligo lesions. Furthermore, we showed that ANXA2R displayed hypermethylation and low expression levels in both keratinocytes and melanocytes of vitiligo patients, and the hypermethylated-triggered downregulation of ANXA2R under oxidative stress induced melanocyte apoptosis, and inhibited the secretion of stem cell factor (SCF) from keratinocytes thus impaired the survival of melanocytes. CONCLUSIONS Our study illustrates the DNA methylation modification in vitiligo, and further demonstrates the molecular mechanism of hypermethylated ANXA2R in the dysfunction of melanocytes under oxidative stress.
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Affiliation(s)
- Jiaxi Chen
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Shaanxi, China
| | - Yinghan Wang
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Shaanxi, China
| | - Wei Dai
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Shaanxi, China
| | - Xinyuan Xu
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Shaanxi, China
| | - Qingrong Ni
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Shaanxi, China
| | - Xiuli Yi
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Shaanxi, China
| | - Pan Kang
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Shaanxi, China
| | - Jingjing Ma
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Shaanxi, China
| | - Lili Wu
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Shaanxi, China
| | - Chunying Li
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Shaanxi, China.
| | - Shuli Li
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Shaanxi, China.
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Rashid S, Molotkov I, Klebanov N, Shaughnessy M, Daly MJ, Artomov M, Tsao H. Mendelian Randomization Analysis reveals Inverse Genetic Risks between Skin Cancers and Vitiligo. JID INNOVATIONS 2023; 3:100217. [PMID: 38034848 PMCID: PMC10685305 DOI: 10.1016/j.xjidi.2023.100217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 04/17/2023] [Accepted: 04/18/2023] [Indexed: 12/02/2023] Open
Abstract
Several observational studies have demonstrated a consistent pattern of decreased melanoma risk among patients with vitiligo. More recently, this finding has been supported by a suggested genetic relationship between the two entities, with certain variants significantly associated with an increased risk of melanoma, basal cell carcinoma, and squamous cell carcinoma but a decreased risk of vitiligo. We compared 48 associated variants from a recently published GWAS and identified three variants-located in the TYR, MC1R-DEF8, and RALY-EIF2S2-ASIP-AHCY-ITCH loci- that correlated with an increased risk for melanoma, basal cell carcinoma, and squamous cell carcinoma and a decreased risk for vitiligo. We then used results of skin cancers and vitiligo GWAS to compare the shared genetic properties between these two traits through an unbiased Mendelian randomization analysis. Our results suggest that the inverse genetic relationship between common skin cancers and vitiligo is broader than previously reported owing to the influence of shared genome-wide significant associations.
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Affiliation(s)
- Sarem Rashid
- Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
- Boston University School of Medicine, Boston, Massachusetts, USA
| | - Ivan Molotkov
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio, USA
- Department of Pediatrics, The Ohio State University College of Medicine, Columbus, Ohio, USA
| | - Nikolai Klebanov
- Department of Dermatology, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Michael Shaughnessy
- Department of Dermatology, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Mark J. Daly
- Analytic & Translational Genetics Unit (ATGU), Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA
- Broad Institute, Cambridge, Massachusetts, USA
- Institute for Molecular Medicine Finland, Helsinki, Finland
| | - Mykyta Artomov
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio, USA
- Department of Pediatrics, The Ohio State University College of Medicine, Columbus, Ohio, USA
- Analytic & Translational Genetics Unit (ATGU), Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA
- Broad Institute, Cambridge, Massachusetts, USA
| | - Hensin Tsao
- Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
- Department of Dermatology, Massachusetts General Hospital, Boston, Massachusetts, USA
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Vinardell MP, Maddaleno AS, Mitjans M. Melanogenesis and Hypopigmentation: The Case of Vitiligo. Indian J Dermatol 2022; 67:524-530. [PMID: 36865864 PMCID: PMC9971791 DOI: 10.4103/ijd.ijd_1067_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/04/2023] Open
Abstract
Melanocytes are highly specialized dendritic cells that synthesize and store melanin in subcellular organelles called melanosomes, before transfer to keratinocytes. Melanin is a complex pigment that provides colour and photoprotection to the skin, hair and eyes. The process of synthesis of melanin is called melanogenesis and is regulated by various mechanisms and factors such as genetic, environmental and endocrine factors. The knowledge of the pigmentation process is important to understand hypopigmentation disorders such as vitiligo and also to design adequate treatments. In the present work, we review the signalling pathways involved in vitiligo. Finally, current therapies and treatments including topical, oral and phototherapies are discussed and described, emphasizing future therapies based on different pigmentation mechanisms.
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Affiliation(s)
- M. Pilar Vinardell
- From the Department Biochemistry and Physiology of the Universitat de Barcelona, Spain
| | | | - Montserrat Mitjans
- From the Department Biochemistry and Physiology of the Universitat de Barcelona, Spain
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Huang M, Lyu C, Li X, Qureshi AA, Han J, Li M. Identifying Susceptibility Loci for Cutaneous Squamous Cell Carcinoma Using a Fast Sequence Kernel Association Test. Front Genet 2021; 12:657499. [PMID: 34040636 PMCID: PMC8141858 DOI: 10.3389/fgene.2021.657499] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Accepted: 04/09/2021] [Indexed: 11/13/2022] Open
Abstract
Cutaneous squamous cell carcinoma (cSCC) accounts for about 20% of all skin cancers, the most common type of malignancy in the United States. Genome-wide association studies (GWAS) have successfully identified multiple genetic variants associated with the risk of cSCC. Most of these studies were single-locus-based, testing genetic variants one-at-a-time. In this article, we performed gene-based association tests to evaluate the joint effect of multiple variants, especially rare variants, on the risk of cSCC by using a fast sequence kernel association test (fastSKAT). The study included 1,710 cSCC cases and 24,304 cancer-free controls from the Nurses' Health Study, the Nurses' Health Study II and the Health Professionals Follow-up Study. We used UCSC Genome Browser to define gene units as candidate loci, and further evaluated the association between all variants within each gene unit and disease outcome. Four genes HP1BP3, DAG1, SEPT7P2, and SLFN12 were identified using Bonferroni adjusted significance level. Our study is complementary to the existing GWASs, and our findings may provide additional insights into the etiology of cSCC. Further studies are needed to validate these findings.
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Affiliation(s)
- Manyan Huang
- Department of Epidemiology and Biostatistics, School of Public Health, Indiana University at Bloomington, Bloomington, IN, United States
| | - Chen Lyu
- Department of Epidemiology and Biostatistics, School of Public Health, Indiana University at Bloomington, Bloomington, IN, United States
| | - Xin Li
- Department of Epidemiology, Richard M. Fairbanks School of Public Health, Indiana University - Purdue University Indianapolis, Indianapolis, IN, United States.,Melvin and Bren Simon Cancer Center, Indianapolis, IN, United States
| | - Abrar A Qureshi
- Department of Dermatology, Alpert Medical School, Brown University, Providence, RI, United States
| | - Jiali Han
- Department of Epidemiology, Richard M. Fairbanks School of Public Health, Indiana University - Purdue University Indianapolis, Indianapolis, IN, United States.,Melvin and Bren Simon Cancer Center, Indianapolis, IN, United States
| | - Ming Li
- Department of Epidemiology and Biostatistics, School of Public Health, Indiana University at Bloomington, Bloomington, IN, United States
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