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Mol Immunol ; 135: 21-27, 2021 07.
Artigo em Inglês | MEDLINE | ID: mdl-33857815

RESUMO

Ultraviolet A (UVA) irradiation caused skin keratinocytes to accumulate reactive oxygen species (ROS) leading to the skin injury. Thymoquinone (TQ) was identified as the prominent bioactive ingredient in Nigella sativa seeds which was applied in therapying various human diseases. This study aimed to illustrate the role and mechanism of TQ in UVA-induced skin injury. We pre-treated HaCaT cells with TQ and irradiated them by UVA. MTT and Elisa assays were used to evaluate cell viability and apoptosis, as well as cytokine levels. To detect the related parameters of oxidative stress and mitochondrial function, colorimetry, spectrophotometry, bioluminescence, and dual-luciferase reporter methods were used. RT-qPCR and western blotting were performed for expressions of related mRNAs and proteins. TQ significantly improved the UVA-induced cytotoxicity on HaCaT cells. TQ treatment alleviated the oxidative stress and inflammation in UVA-irradiated keratinocytes. Besides, UVA irradiation promoted mitochondrial dysregulation in HaCaT cells leading to cell apoptosis, which could be reversed by TQ treatment. More importantly, NrF2/ARE pathway was activated in TQ-treated cells, while COX-2 was depressed, and inhibiting the pathway or activating COX-2 blocked the therapeutic effect of TQ on UVA-induced skin cell injury. Our study suggested that TQ treatment attenuated the UVA-induced oxidative and inflammatory responses, as well as mitochondrial apoptosis in keratinocytes by COX-2 inhibition via activating NrF2/ARE pathway. This might be a novel sight for preventing the solar radiation damage to the skin.


Assuntos
Benzoquinonas/farmacologia , Queratinócitos/efeitos da radiação , Mitocôndrias/efeitos da radiação , Nigella sativa/metabolismo , Substâncias Protetoras/farmacologia , Raios Ultravioleta/efeitos adversos , Apoptose/efeitos dos fármacos , Apoptose/efeitos da radiação , Linhagem Celular Transformada , Sobrevivência Celular/efeitos dos fármacos , Sobrevivência Celular/efeitos da radiação , Ciclo-Oxigenase 2/metabolismo , Inibidores de Ciclo-Oxigenase 2/farmacologia , Citocinas/metabolismo , Células HaCaT , Humanos , Inflamação/prevenção & controle , Fator 2 Relacionado a NF-E2/metabolismo , Estresse Oxidativo/efeitos da radiação , Extratos Vegetais/farmacologia , Espécies Reativas de Oxigênio/metabolismo , Sementes/metabolismo , Pele/lesões
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