Avaliação da atividade anti-inflamatória docarotenoide bixina em ratos submetidos ao modelo de colite ulcerativa induzida por ácido trinitrobenzenossulfônico

• Autor(a) principal: Araújo, Joniel Mendes de
• Data de Publicação: 2017
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/7926
• topic: Atividade anti-inflamatória; Bixina; Carotenoide; Doenças inflamatórias intestinais; Ácido trinitrobenzenosulfônico; Anti-inflammatory activity; Carotenoid; Inflammatory bowel diseases; Trinitrobenzenesulfonic acid; CIENCIAS BIOLOGICAS::FISIOLOGIA

Crohn's disease (CD) and ulcerative colitis (RCU) are the major and most prevalent inflammatory bowel diseases (IBD). The lack of effective treatment makes the search for new drugs to treat IBD extremely important. Bixin, a carotenoid present in the species Bixa orellana L., appears as a possible candidate for presenting several biological activities among them antibacterial, antioxidant and anti-inflammatory. The objective of this study was to evaluate the intestinal anti-inflammatory effect of Bixin in experimental TNBS-induced colitis in rats. For the experimental protocol Wistar rats (n = 10) were divided into 7 groups: Saline group (without colitis), TNBS group (with colitis) and groups treated with Bixina gavage at doses of 1, 3, 6, 9 and 12mg / kg. Colitis was induced according to the procedure described by Morris et al. (1989). Euthanasia was performed by CO2 overdose followed by removal of the colon for macroscopic and histological analysis. The results demonstrated that the presence of adhesions and diarrhea was decreased in the groups treated with Bixina. The macroscopic analysis of the colon evidenced the presence of severe damage to the colonic mucosa, with edema, deep ulcerations and hemorrhage in the TNBS group. The Bixina-treated group (12 mg/kg) significantly attenuated the areas of ulcerative lesion and macroscopic score when compared to the TNBS group. Animals receiving Bixin (12 mg/kg) also had a decreased mass / length ratio of the colon compared to the TNBS group. The histological characteristics of the colon of the TNBS group showed severe signs of inflammation, necrosis and edema. However, the Bixin group (12 mg/kg) showed better cell organization and less intestinal epithelial damage when compared to the TNBS group. The results suggest a protective effect of the carotenoid Bixin against experimental colitis induced by TNBS. However, new studies must be performed to verify the mechanisms involved in this activity.