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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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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]
Total Authors: 6
[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
Total Affiliations: 3
Document type: Journal article
Source: International Immunopharmacology; v. 23, n. 2, p. 664-671, DEC 2014.
Web of Science Citations: 1

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)

FAPESP's process: 08/10869-6 - Modulation of mice pulmonary allergic responses by the sthaphylococcal enterotoxin types a and b (sea and SEB)and human eosinophil
Grantee:Dalize Maria Squebola Cola
Support type: Scholarships in Brazil - Doctorate