Propolis effects on pro-inflammatory cytokine production and Toll-like receptor 2 and 4 expression in stressed mice

Autor(es)

Pagliarone, Ana Carolina ^[1] ; Orsatti, Claudio Lera ^[1] ; Bufalo, Michelle Cristiane ^[1] ; Missima, Fabiane ^[1] ; Bachiega, Tatiana Fernanda ^[1] ; Araujo Junior, Joao Pessoa ^[1] ; Sforcin, Jose Mauricio ^[1]

Afiliação do(s) autor(es)

^[1] UNESP, Biosci Inst, Dept Microbiol & Immunol, BR-18618000 Botucatu, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: International Immunopharmacology; v. 9, n. 11, p. 1352-1356, OCT 2009.
• Citações Web of Science: 23

Resumo

Introduction: Propolis is a beehive product and its immunomodulatory action has been well documented; however, little is known concerning its activity on the immune system of stressed mice. This work investigated a possible role of propolis against the immunosuppressive effects induced by stress in mice, assessing the pro-inflammatory cytokine (IL-1 beta and IL-6) production and Toll-like receptor (TLR-2 and TLR-4) expression by spleen cells. Methods: BALB/c mice were divided into 3 groups: G1 was considered control; G2 was submitted to restraint stress for 3 days, and G3 was treated with propolis and immediately submitted to stress. After sacrifice, spleens were removed and TLR-2 and TLR-4 gene expression was analyzed, as well as the pro-inflammatory cytokine production. Serum corticosterone levels were determined by radioimmunoassay as a stress indicator. Results: Stressed mice, treated or not with propolis, produced higher corticosterone levels, whereas IL-1 beta and IL-6 production was inhibited. TLR-2 and TLR-4 expression was inhibited in stressed mice, while propolis exerted an immunorestorative role in TLR-4 expression. The immunosuppressive effects on IL-1 beta and IL-6 production and on TLR expression by stressed mice might have occurred due to a higher corticosterone production during stress. Conclusion: Propolis treatment did not antagonize the inhibitory effects on pro-inflammatory cytokine production, however it restored at least partially TLR2 mRNA expression and counteracted the inhibition on TLR-4 expression in stressed animals, contributing to the recognition of microorganisms during stressful conditions. (C) 2009 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 07/02692-6 - Expressão de TLR-2 e TLR-4 e produção de citocinas por esplenócitos de camundongos submetidos a estresse agudo
• Beneficiário: José Maurício Sforcin
• Modalidade de apoio: Auxílio à Pesquisa - Regular