Exploring pathways for sustained melanogenesis in facial melasma: an immunofluorescence study

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dc.contributor.authorEspósito, A. C.C. [UNESP]
dc.contributor.authorBrianezi, G. [UNESP]
dc.contributor.authorde Souza, N. P. [UNESP]
dc.contributor.authorMiot, L. D.B. [UNESP]
dc.contributor.authorMarques, M. E.A. [UNESP]
dc.contributor.authorMiot, H. A. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2018-12-11T17:22:37Z
dc.date.available2018-12-11T17:22:37Z
dc.date.issued2018-08-01
dc.description.abstractBackground: The physiopathology of epidermal hypermelanization in melasma is not completely understood. Several cytokines and growth factors are increased in skin with melasma, nevertheless, nor the pathways involved in the increased αMSH expression have been adequately evaluated, nor a model for sustained focal melanogenesis is available. Objective: To explore stimulatory pathways for epidermal pigmentation in facial melasma related to αMSH: those linked to ultraviolet radiation, oxidative stress, inflammation, neural crest pigmentation cell differentiation and antagonism of αMSH. Methods: Paired skin biopsies (3 mm) from 26 women with facial melasma and from normal adjacent skin (<2 cm far) were processed for immunofluorescence with markers for p53, p38, αMSH, MC1R, Melan-A, IL-1α, COX2, Wnt1, WIF-1 and ASIP. Results: The fluorescence intensity in the skin from melasma was higher for MC1R, αMSH at epidermis as at melanocytes (P < 0.05). There were no differences between the sites in epidermal protein expression of COX2, IL-1α, p53, WIF-1 and ASIP (P > 0.1). P53 was expressed only in epidermis, without difference between sites (P = 0.92). WNT1 was remarkable in the epidermis of melasma (P < 0.01), but not in dermis. Positive p38 cells were prominent in the upper dermis of melasma (P < 0.01), despite no marking in epidermis. Conclusion: Melanogenesis in melasma involves epithelial secretion of αMSH and activation of the Wnt pathway; nevertheless, it seems to be independent of the stimulation by ultraviolet radiation/p53, IL-1α, COX2/PgE2, WIF-1 and ASIP. Damaged cells at upper dermis suggest the role of senescence/autophagy in sustained pigmentation in melasma.en
dc.description.affiliationDepartamento de Dermatologia e Radioterapia Av. Prof. Mário Rubens Guimarães Montenegro SN Faculdade de Medicina da UNESP Campus Universitário de Rubião
dc.description.affiliationDepartamento de Patologia Av. Prof. Mário Rubens Guimarães Montenegro SN Faculdade de Medicina da UNESP Campus Universitário de Rubião
dc.description.affiliationUnespDepartamento de Dermatologia e Radioterapia Av. Prof. Mário Rubens Guimarães Montenegro SN Faculdade de Medicina da UNESP Campus Universitário de Rubião
dc.description.affiliationUnespDepartamento de Patologia Av. Prof. Mário Rubens Guimarães Montenegro SN Faculdade de Medicina da UNESP Campus Universitário de Rubião
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.format.extent420-424
dc.identifierhttp://dx.doi.org/10.1111/ics.12468
dc.identifier.citationInternational Journal of Cosmetic Science, v. 40, n. 4, p. 420-424, 2018.
dc.identifier.doi10.1111/ics.12468
dc.identifier.issn1468-2494
dc.identifier.issn0142-5463
dc.identifier.scopus2-s2.0-85053004300
dc.identifier.urihttp://hdl.handle.net/11449/176818
dc.language.isoeng
dc.relation.ispartofInternational Journal of Cosmetic Science
dc.relation.ispartofsjr0,548
dc.relation.ispartofsjr0,548
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectCOX2
dc.subjectmelanin
dc.subjectmelasma
dc.subjectp38
dc.subjectp53
dc.subjectpigmentation
dc.subjectultraviolet radiation
dc.subjectα MSH
dc.titleExploring pathways for sustained melanogenesis in facial melasma: an immunofluorescence studyen
dc.typeArtigo
unesp.author.orcid0000-0002-2596-9294[6]

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Artigos - Dermatologia e Radioterapia - FMB
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