Avaliação do efeito inflamatório da proteína galectina-1 nas células epiteliais pigmentadas da retina humana (ARPE-19) após ativação por endotoxina
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Data
2013-02-27
Autores
Sonehara, Nathália Martins [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Introdução: A inflamação ocular é geralmente tratada com glicocorticoides, cujos efeitos colaterais estimulam novas estratégias terapêuticas. Nesse aspecto, destacamos a Galectina-1 (Gal-1), proteína com potencial anti- inflamatório, cuja ação em tecidos oculares foi pouco investigada. Objetivo: No presente estudo avaliamos a expressão da Gal-1 nas células epiteliais pigmentadas da retina humana (ARPE-19), após ativação pelo inflamógeno lipopolissacarídeo (LPS) e tratamentos com a Gal-1 recombinante humana (hrGal-1). Métodos: Para avaliar o efeito anti-inflamatório da Gal-1, as células ARPE-19 foram cultivadas em meio DMEM:F-12 completo (controle), ativadas pelo LPS (10 µg/mL) e tratadas com hrGal-1 (0,04; 0,4 e 4 µg/mL) ou glicocorticoide dexametasona (Dex: 1µM), nos períodos de 2, 8, 24 e 48 horas. Nessas condições, avaliamos a citotoxicidade dos tratamentos farmacológicos por ensaios de viabilidade celular e, a expressão da Gal-1 endógena nas células ativadas pelo LPS e tratadas com Dex, por meio da imunocitoquímica ultraestrutural. Nos sobrenadantes, em todos os tempos experimentais, analisamos os níveis das citocinas IL-6, IL-8, IL-10, TNF-α, IL-1β e MCP-1 pelo método de ELISA. Com a finalidade de determinar a especificidade do efeito da hrGal-1, via domínio reconhecedor de carboidrato (CRD) sobre as células ARPE-19, adicionamos nas culturas os açúcares com ou sem afinidade pelo CRD (respectivamente β-galactose ou sucrose - 100mM) e, após 8 horas, os sobrenadantes foram coletados para análise das citocinas pró-inflamatórias IL- 6 e IL-8. Ainda, investigamos a expressão da enzima ciclo-oxigenase 2 (COX- 2), um importante mediador do processo inflamatório, nos períodos de 8 e 24 horas, por imunofluorescência. Resultados: Os ensaios de viabilidade celular mostram que os diferentes tratamentos...
Introduction: Ocular inflammation has often been treated with glucocorticoids, however, collateral side effects stimulate the search for new therapeutic strategies. In view of this, we emphasis on Galectin-1 (Gal-1), a protein with anti-inflammatory potential that has been poorly investigated in ocular tissues. Aim: The aim of this paper is to evaluate the expression and mechanism of action of Gal-1 in human retinal pigment epithelial cells (ARPE-19 cells) activated by lipopolysaccharide (LPS) and treated with recombinant human Gal- 1 (hrGal-1). Methods: To assess the anti-inflammatory effect of Gal-1, ARPE- 19 cells were cultured in DMEM: complete F-12 (control), activated by LPS and treated with hrGal-1 (0,04; 0,4 e 4 µg/mL)or glucocorticoid dexamethasone (Dex: 1μM) at 2, 8, 24 and 48 hours. Under these conditions, we evaluated the cytotoxicity of pharmacological treatments by cell viability assays, and the expression of the endogenous Gal-1 in cells activated by LPS and treated with Dex by ultrastructural immunocytochemistry. In the supernatants of these cells, in all experimental periods, we analyzed the levels of IL-6, IL-8, IL-10, TNF-α, IL-1β and MCP-1 by ELISA. In order to determine the specificity of the effect of hrGal-1 via carbohydrate recognizer domain (CRD) on ARPE-19 cells, we added sugars to the culture with or without their affinity for the CRD (respectively β-galactose or sucrose - 100 mM), and these supernatants were collected after 8 hours for analysis of pro-inflammatory cytokines IL-6 and IL-8. We also analyzed the expression of the cyclooxygenase-2 (COX-2) enzyme, an important inflammatory process mediator, at 8 and 24 hours by immunofluorescence. Results: The assays of cell viability show that the different drug treatments have low cytotoxicity. The cells activated with... (Complete abstract click electronic access below)
Introduction: Ocular inflammation has often been treated with glucocorticoids, however, collateral side effects stimulate the search for new therapeutic strategies. In view of this, we emphasis on Galectin-1 (Gal-1), a protein with anti-inflammatory potential that has been poorly investigated in ocular tissues. Aim: The aim of this paper is to evaluate the expression and mechanism of action of Gal-1 in human retinal pigment epithelial cells (ARPE-19 cells) activated by lipopolysaccharide (LPS) and treated with recombinant human Gal- 1 (hrGal-1). Methods: To assess the anti-inflammatory effect of Gal-1, ARPE- 19 cells were cultured in DMEM: complete F-12 (control), activated by LPS and treated with hrGal-1 (0,04; 0,4 e 4 µg/mL)or glucocorticoid dexamethasone (Dex: 1μM) at 2, 8, 24 and 48 hours. Under these conditions, we evaluated the cytotoxicity of pharmacological treatments by cell viability assays, and the expression of the endogenous Gal-1 in cells activated by LPS and treated with Dex by ultrastructural immunocytochemistry. In the supernatants of these cells, in all experimental periods, we analyzed the levels of IL-6, IL-8, IL-10, TNF-α, IL-1β and MCP-1 by ELISA. In order to determine the specificity of the effect of hrGal-1 via carbohydrate recognizer domain (CRD) on ARPE-19 cells, we added sugars to the culture with or without their affinity for the CRD (respectively β-galactose or sucrose - 100 mM), and these supernatants were collected after 8 hours for analysis of pro-inflammatory cytokines IL-6 and IL-8. We also analyzed the expression of the cyclooxygenase-2 (COX-2) enzyme, an important inflammatory process mediator, at 8 and 24 hours by immunofluorescence. Results: The assays of cell viability show that the different drug treatments have low cytotoxicity. The cells activated with... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Proteínas - Estrutura, Agentes anti-inflamatorios, Uveite, Endotoxina, Galectina-1, Proteínas - Estrutura
Como citar
SONEHARA, Nathália Martins. Avaliação do efeito inflamatório da proteína galectina-1 nas células epiteliais pigmentadas da retina humana (ARPE-19) após ativação por endotoxina. 2013. 78 f. Dissertação (mestrado) - Universidade Estadual Paulista Julio de Mesquita Filho, Instituto de Biociências, Letras e Ciências Exatas de São José do Rio Preto, 2013.