Efeito do 5-fluorouracil em glândulas salivares maiores em modelo experimental de mucosite oral

• Ano de defesa: 2016
• Autor(a) principal: Bomfin, Luana Eschholz
• Orientador(a): Brito, Gerly Anne de Castro
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Estomatite; Xerostomia; Fluoruracila
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/61492

The aim of this study was to elucidate the effect of 5-Fluorouracil (5-FU) on major salivary glands, salivary flow and saliva composition using an established oral mucositis (OM) model, in hamsters. OM was induced by two intraperitoneal administrations of 5-FU on 1st and 2nd days of the experimental model (60mg/kg and 40mg/kg, respectively), followed by cheek pouch mucosa scratch. Pilocarpine stimulated salivary flow were measured, saliva was collected, salivary glands were harvested for histopathologycal analysis, measurement of inflammatory cells, evaluation of oxidative stress (SOD, CAT, nitrite, NP-SH and MDA), quantification of pro-inflammatory cytokines (TNF-α and IL-1β) and investigation of cell death and proliferation. CAT and lysozyme activities and IgA and SOD levels were evaluated in saliva samples. This study demonstrated that 5-FU significantly reduced the pilocarpine stimulated salivary flow rate on the 4th experimental day, associated with an increase in SOD levels in saliva. Recovery of salivary flow was observed on day 10, when a decrease in the saliva lysozyme levels was detected. In addition, 5-FU promoted vacuolization in parotid gland and periductal edema in submandibular gland, combined with an increase in the inflammatory cells influx, mostly observed on the 4th day in submandibular gland and on 4th and 10th days in parotid gland. 5-FU stimulated pro-inflammatory cytokines (TNF-α and IL-1β) production on 10th day in submandibular and sublingual glands associated with oxidative stress. Although the stimulation of oxidative stress on 10th day, 5-FU promoted inhibitory effect on both pro-inflammatory cytokines in parotid gland. According to the above mentioned results, 5-FU induced an inflammatory response in major salivary glands, most observed 10 days after its first injection, which may contribute to glands hypofunction, leading to alterations in the salivary flow rate and composition.