Modelo experimental de conjuntivite alérgica: efeito do tratamento farmacológico com a proteína anti-inflamatória galectina - 1

• Autor(a) principal: Mello-Bochi, Cláudia Bosnic [UNESP]
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/122179
• topic: Biologia molecular; Proteínas - Estrutura; Galectina 1; Conjutivite alérgica; Olhos - Inflamação; Agentes anti-inflamatorios; Imuno-histoquímica; Molecular biology

Allergic conjunctivitis (AC) is a complex disease of the immune system which includes mast cell degranulation in the conjunctiva and release of mediators that trigger inflammatory cell infiltration in this mucous membrane. Among the anti-inflammatory mediators, we highlight the protein galectin-1 (Gal-1) which regulates the process of leukocyte transmigration, release of cytokines and mast cell degranulation. However, its role in ocular inflammation has been little studied. BALB/c male mice were sensitized subcutaneously with 5μg of ovalbumin (OVA) on days 0 and 7 and challenged by eye drops containing OVA (250 μg) once daily (days 14, 15 and 16). For pharmacological treatment (days 14-16) animals received intraperitoneally recombinant Gal-1 (rGal-1; 0.3 μg /animal) or dexamethasone (Dex; 1 mg/kg). The clinical score was performed twenty minutes after OVA challenge (days14-16). After 4 and 24 hours of last OVA challenge, the animals were sacrificed and the followed analyses were performed: histopathology and quantification of inflammatory cells in the bulbar conjunctiva and blood; plasma anti-OVA IgE levels by ELISA; cytokines (IL-2, IL-4, IL-5, IL-10, IL-13, TNF-α and IFN-γ) and chemokines (RANTES, MCP- 1 and eotaxin) levels in the eyes, lacrimal fluid and lymph nodes by multiplex panel; and immunohistochemistry to detect Gal-1 expression in the conjunctiva. The CA was characterized by a significant increase in the score, especially on the 16th day (5.7 ± 0.3, P < 0.001)compared with controls (2.6 ± 0.6), followed by high anti-OVA IgE levels after 4 and 24h. Pharmacological treatments with rGal - 1(1.2 ± 0.5, P < 0.001) and Dex (3.0 ± 0.2, P < 0.05) decreased the clinical signs and rGal -1 reduced anti-IgE OVA levels(28.6 ± 6.3, P < 0.05), compared to the CA group (70 ± 12.8). Histopathological and quantitative analysis of inflammatory cellspresented a significant increase of mast cells,intravascular and transmigrated ...