Phagocytosis and killing of epidemic methicillin-resistant Staphylococcus aureus by human neutrophils and monocytes

Phagocytosis and killing of epidemic methicillin-resistant Staphylococcus aureus by human neutrophils and monocytes

Autor Salgado, M.m. Google Scholar
Pignatari, Antonio Carlos Campos Autor UNIFESP Google Scholar
Bellinati-Pires, R. Google Scholar
Instituição Adolfo Lutz Institute Immunology Section
Universidade Federal de São Paulo (UNIFESP)
Resumo Staphylococcus aureus is a pathogen that has been associated with nosocomial infections since the preantibiotic era. Since the introduction of antibiotics in medical practice in the 1940 s, methicillin-resistant S. aureus (MRSA) strains have been emerging in various parts of the world. In view of the important role of the phagocytic system in the defense against this bacteria, we decided to study phagocytosis by neutrophils and monocytes of an epidemic MRSA strain in São Paulo, Brazil, in comparison with methicillin-sensitive strains. Complement system opsonins are fundamental for efficient ingestion of the resistant and sensitive strains by both types of phagocytes. We found no association of the opsonic requirement of the MRSA strain with the multiresistance phenotype. On the other hand, the MRSA strain was found to be more resistant to the effector mechanisms of neutrophils than both sensitive strains when opsonized with fresh serum, despite the phagocytosis results. This fact suggests that the intracellular killing of S. aureus is an additional parameter of bacterial virulence, but new approaches must be implemented to study the interactions of this MRSA strain with phagocytes in order to investigate the possible factors involved in its behavior in response to neutrophil effector mechanisms.
Palavra-chave Staphylococcus aureus
human phagocytes
epidemic methicillin-resistant
Idioma Inglês
Data de publicação 2004-02-01
Publicado em Brazilian Journal of Infectious Diseases. Brazilian Society of Infectious Diseases, v. 8, n. 1, p. 80-89, 2004.
ISSN 1413-8670 (Sherpa/Romeo)
Publicador Brazilian Society of Infectious Diseases
Extensão 80-89
Direito de acesso Acesso aberto Open Access
Tipo Artigo
SciELO S1413-86702004000100005 (estatísticas na SciELO)
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