Nonsegmental Vitiligo and Autoimmune Mechanism

Oiso, Naoki; Suzuki, Tamio; Fukai, Kazuyoshi; Katayama, Ichiro; Kawada, Akira

doi:https://doi.org/10.1155/2011/518090

Dermatology Research and Practice

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Review Article | Open Access

Volume 2011 | Article ID 518090 | https://doi.org/10.1155/2011/518090

Nonsegmental Vitiligo and Autoimmune Mechanism

Naoki Oiso,¹Tamio Suzuki,²Kazuyoshi Fukai,³Ichiro Katayama,⁴and Akira Kawada¹

Academic Editor: Davinder Parsad

Received31 Mar 2011

Revised30 May 2011

Accepted01 Jun 2011

Published26 Jul 2011

Abstract

Nonsegmental vitiligo is a depigmented skin disorder showing acquired, progressive, and depigmented lesions of the skin, mucosa, and hair. It is believed to be caused mainly by the autoimmune loss of melanocytes from the involved areas. It is frequently associated with other autoimmune diseases, particularly autoimmune thyroid diseases including Hashimoto's thyroiditis and Graves' disease, rheumatoid arthritis, type 1 diabetes, psoriasis, pernicious anemia, systemic lupus erythematosus, Addison's disease, and alopecia areata. This indicates the presence of genetically determined susceptibility to not only vitiligo but also to other autoimmune disorders. Here, we summarize current understanding of autoimmune pathogenesis in non-segmental vitiligo.

1. Nonsegmental Vitiligo

Nonsegmental vitiligo is acquired depigmented skin lesions mainly caused by autoimmune loss of melanocytes. Genetic and environmental factors are involved in the development. Recent genetic studies identified predisposed genes involving the development of nonsegmental vitiligo [1–5]. Current histopathological studies showed increased infiltration of dendritic cells, Th17 cells [6], and CD8+ cytotoxic T lymphocytes [7–10] in the margin of vitiligo and the reduced number of regulatory T (Treg) cells in the affected skin [11, 12].

2. Genetics in Nonsegmental Vitiligo

Genome-wide association studies are applied for identifying the candidate genes in multifactor-associated disorders such as nonsegmental vitiligo [1–5]. In 2007, NALP1 was revealed to be associated with the risk of nonsegmental vitiligo in Caucasians [1]. The subsequent studies in Caucasians identified multiple loci on major-histocompatibility-complex (MHC) class I molecules, MHC class II molecules, PTPN22, LPP, IL2RA, UBASH3A, C1QTNF6, RERE, GZMB, TYR, FOXP1, CCR6, TSLP, XBP1, and FOXP3 [2–4]. Another study in Chinese Han population detected two independent loci within the MHC region and a locus at 6q27 containing RNASET2, FGFR1OP, and CCR6 [5]. The current candidate genes of nonsegmental vitiligo are summarized in Table 1 [13–91]. These genes are classified into (i) autoantigen, (ii) innate immunity, (iii) innate and acquired immunity, and (iv) other function and miscellaneous. Importantly, nonsegmental vitiligo-susceptible genes are often involved in other autoimmune disorders. Further study is needed to identify additional nonsegmental vitiligo susceptible genes and to elucidate the pathologic mechanism of the genes in nonsegmental vitiligo.

3. Immunology in Nonsegmental Vitiligo

Nonsegmental vitiligo can be caused by an immunologically complex mechanism. A variety of melanocytes-expressing proteins have been identified as autoantigens. Cui et al. showed that 24 (83%) of 29 vitiligo patients had autoantibody to melanocytes-associated autoantigen versus 2 (7%) of 28 healthy controls [92]. Until now, various proteins have been detected as autoantigens including tyrosinase [93–95], tyrosinase-related protein 1 [96–99], tyrosinase-related protein 2 [96, 100], Pmel17 [101, 102], melanin-concentrating hormone receptor 1 [103], tyrosine hydroxylase [104], and lamin A [99]. Antityrosine hydroxylase autoantibody was more frequent in active vitiligo patients [104], suggesting potency as an activity marker. Using radioimmunoassay, Waterman et al. found positive antibody reactivity to gamma-enolase (8%), alpha-enolase (9%), heat-shock protein 90 (13%), osteopontin (4%), ubiquitin-conjugating enzyme (15%), translation-initiation factor 2 (6%), and Rab38 (guanosine-5′-triphosphate- (GTP-) binding protein) (15%) in nonsegmental vitiligo patient sera [105]. Melanocyte-specific antibodies might induce apoptosis of melanocytes [106]. Ruiz-Argüelles et al. reported that serum immunoglobulin G antibodies from vitiligo patients were able to penetrate cultured melanocytes in vitro and trigger apoptosis [106]. However, further investigations are required to elucidate the pathogenetic function of autoantibodies [107].

Histopathological studies demonstrated the increased dendritic cells [6], Th17 cells [6, 108], and CD8+ cytotoxic T lymphocytes [7–10] and the decreased naturally occurring CD4+CD25+FOXP3+ Treg cells [11, 12] at the margin of vitiligo lesions. The infiltrating cytotoxic CD8+ T cells recognize melanocyte-associated autoantigens and enable to locate at dermal-epidermal junctions [109]. The paucity of Treg in vitiligo skin causes perpetual antimelanocyte reactivity in nonsegmental vitiligo [110, 111]. The role of Treg and Th17 cells should be elucidated in order to understand the balance between the occurrence and suppression of the autoimmune reaction.

The activation of inflammasome constructed by NOD-like receptors such as NALP-1 overproduces proinflammatory cytokines of IL-1β and IL-18, inducing apoptosis [112]. Interestingly, Wang et al. showed the increased IL-1β level in the vitiligo lesion and the expression of NALP-1 in the activated epidermal Langerhans cells and dermal dendritic cells [6]. As IL-1β is the essential cytokine to develop Th17 cells [6], IL-1β produced by activated inflammasome may involve the development of nonsegmental vitiligo.

4. Conclusion

Considerable progress is being made towards understanding the pathogenesis of nonsegmental vitiligo. Although a number of genes have been implicated by well-designed genome-wide association studies, we do not have good genotype-phenotype correlations. In the future, we can anticipate further advancement regarding specific interactions between disease-susceptible genes and gene-environment interactions.

Conflict of Interests

The authors declared that there is no conflict of interests.

Acknowledgments

This work was supported by Grant-In-Aid no. 21591449 from the Ministry of Education, Science and Culture of Japan (to N. Oiso) and by a Grant-In-Aid from Health Sciences Research grants from the Ministry of Health, Welfare and Labor of Japan.

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Copyright © 2011 Naoki Oiso et al. 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.

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