Effects of Single Exposure of Sodium Fluoride on Lipid Peroxidation and Antioxidant Enzymes in Salivary Glands of Rats

• Processo: 13/07371-4
• Modalidade de apoio: Auxílio à Pesquisa - Publicações científicas - Artigo
• Data de Início da vigência: 01 de junho de 2013
• Data de Término da vigência: 30 de novembro de 2013
• Área do conhecimento: Ciências da Saúde - Odontologia
• Pesquisador responsável: José Nicolau
• Beneficiário: José Nicolau
• Instituição Sede: Faculdade de Odontologia (FO). Universidade de São Paulo (USP). São Paulo , SP, Brasil
• Assunto(s): Glândulas salivares Flúor Estresse oxidativo Antioxidantes Bioquímica oral
• Palavra(s)-Chave do Pesquisador: antioxidante | Estresse oxidativo | Fluor | Glândula Salivar | Bioquímica Oral

Resumo

Many studies suggest that fluoride exposure can inhibit the activity of various enzymes, and can generate free radicals, which interfere with antioxidant defence mechanisms in living systems. To further the understanding of this issue, this present study examined the effects of low dose fluoride treatment on the activity of enzymatic antioxidant superoxide dismutase (SOD) and catalase (CAT), as well as the levels of lipid peroxidation (LPO) in the parotid (PA) and submandibular (SM) salivary glands of rats. Rats were injected with a single dose of sodium fluoride (NaF) (15 mg F-/kg b.w.), then euthanized at various time intervals up to 24 hours (h) following exposure. NaF exposure did not cause significant differences in SOD or CAT activity, or LPO levels in PA glands compared to control. Conversely, SM glands presented increased SOD activity after 3 h and decreased SOD activity after 1, 12 and 24 h, while LPO was increased after 6, 12 and 24 h of the NaF injection. There were no significant differences in the CAT activity in the groups studied. Our results demonstrated that NaF intoxication caused oxidative stress in salivary glands few hours after administration. These changes were more pronounced in SM than in PA gland. (AU)