Background Atopic dermatitis (AD) is an itchy, chronic and inflammatory skin condition, with dysfunctional immune response and skin barrier defects. Reduction of filaggrin (FLG) and tight junctions (TJ) proteins, such as claudin-1 (CLDN-1), expression in cutaneous epithelial barrier is remarkable in AD pathogenesis. Ocular involvement occurs in approximately 40% of AD patients leading to changes in the structure of the conjunctiva.Objectives We aimed to evaluate the expression of FLG and CLDN-1 in the ocular surface of adults with AD, analysing bulbar conjunctival cells collected by a novel non-invasive cellular imprint.Methods Bulbar conjunctival epithelial cells were collected by cellular imprint technique, and FLG and CLDN-1 expression were assessed by immunofluorescence (IF) and real-time polymerase chain reaction (RT-PCR). ResultsWe detected increased expression of FLG and CLDN-1, as well as their transcript levels in AD patients compared with healthy controls (HC). There was a positive correlation between tear film break-up time (TBUT) and FLG expression. Fluorescein staining was inversely associated with FLG expression. Conclusions Our results may reflect a reactive response of the ocular surface to AD-related ocular inflammation and associated dry eye disease. Further investigations focusing on the role of FLG and TJ expression in the ocular surface of AD patients may increment the understanding of the pathophysiology of extracutaneous AD and developing future targeted therapies.
Análise da expressão das proteínas de barreira epitelial, filagrina e claudina-1, na superfície ocular de pacientes portadores de dermatite atópica São Paulo 2019 Tese apresentada à Faculdade de Medicina da Universidade de São Paulo para obtenção do título em doutor em Ciências Programa de Oftalmologia Orientador: Profa. Dra. Ruth Miyuki Santo Co-orientador: Profa. Dra. Monique Matsuda Dedicatória DedicatóriaAos meus pais José Lívio e Bida, pelo amor incondicional, pelo apoio incessante a minha carreira profissional, por serem meus maiores exemplos de dedicação e firmeza de caráter e a quem serei eternamente grata.Ao meu esposo Bruno, que esteve ao meu lado em todas as etapas da construção desta tese e representou minha fortaleza nas partes mais árduas; com quem pude dividir aprendizados e de quem sempre recebi carinho, compreensão e estímulo.Ao meu filho Bernardo, que faz brotar em mim diariamente um desejo cada vez maior de crescer como ser humano e como profissional.Aos meus irmãos Clarice, Eduardo e Romero, pela certeza de que juntos somos mais fortes, por serem pilares na minha vida.Aos meus tios José Luiz e Amélia e as minhas primas Natália, Alexandra e Rosa, que vibraram com cada conquista e que significaram um porto seguro na minha trajetória em São Paulo.Ao meu avô Antônio Lyrio Callou (in memorian), que me deixou o grande legado de ingressar na carreira acadêmica.
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