Staphylococcus aureus enterotoxins A and B inhibit human and mice eosinophil chemotaxis and adhesion in vitro

Autor(es)

Squebola-Cola, Dalize M. ^[1] ; De Mello, Glaucia C. ^[1] ; Anhe, Gabriel F. ^[1] ; Condino-Neto, Antonio ^[2] ; DeSouza, Ivani A. ^[3] ; Antunes, Edson ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Fac Med Sci, Dept Pharmacol, BR-13084971 Campinas, SP - Brazil

^[2] Univ Sao Paulo, Inst Biomed Sci, Dept Immunol, Sao Paulo - Brazil

^[3] FMJ, Dept Biol & Physiol, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: International Immunopharmacology; v. 23, n. 2, p. 664-671, DEC 2014.
• Citações Web of Science: 1

Resumo

Staphylococcus aureus aggravates the allergic eosinophilic inflammation. We hypothesized that Staphylococcus aureus-derived enterotoxins directly affect eosinophil functions. Therefore, this study investigated the effects of Staphylococcal enterotoxins A and B (SEA and SEB) on human and mice eosinophil chemotaxis and adhesion in vitro, focusing on p38 MAPK phosphorylation and intracellular Ca2+ mobilization. Eosinophil chemotaxis was evaluated using a microchemotaxis chamber, whereas adhesion was performed in VCAM-1 and ICAM-1-coated plates. Measurement of p38 MAPK phosphorylation and intracellular Ca2+ levels were monitored by flow cytometry and fluorogenic calcium-binding dye, respectively. Prior incubation (30 to 240 min) of human blood eosinophils with SEA (0.5 to 3 ng/ml) significantly reduced eotaxin-, PAF- and RANTES-induced chemotaxis (P < 0.05). Likewise, SEB (1 ng/ml, 30 min) significantly reduced eotaxin-induced human eosinophil chemotaxis (P < 0.05). The reduction of eotaxin-induced human eosinophil chemotaxis by SEA and SEB was prevented by anti-MHC monoclonal antibody (1 mu g/ml). In addition, SEA and SEB nearly suppressed the eotaxin-induced human eosinophil adhesion in ICAM-1- and VCAM-1-coated plates. SEA and SEB prevented the increases of p38 MAPK phosphorylation and Ca2+ levels in eotaxin-activated human eosinophils. In separate protocols, we evaluated the effects of SEA on chemotaxis and adhesion of eosinophils obtained from mice bone marrow. SEA (10 ng/ml) significantly reduced the eotaxin-induced chemotaxis along with cell adhesion to both ICAM-1 and VCAM-1-coated plates (P < 0.05). In conclusion, the inhibition by SEA and SEB of eosinophil functions (chemotaxis and adhesion) are associated with reductions of p38 MAPK phosphorylation and intracellular Ca2+ mobilization. (C) 2014 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 08/10869-6 - Enterotoxinas estafilocócicas tipos A e B (SEA e SEB: Influência sobre a resposta pulmonar alérgica em camundongos e eosinófilos humanos.
• Beneficiário: Dalize Maria Squebola Cola
• Modalidade de apoio: Bolsas no Brasil - Doutorado