Diminished neutrophil oxidative metabolism after phagocytosis of virulent Salmonella typhi.
AUTOR(ES)
Kossack, R E
RESUMO
The interactions of human polymorphonuclear neutrophils (PMNs) with virulent and avirulent strains of Salmonella typhi were examined. Ingestion of the S. typhi strains by PMNs was evaluated with three techniques: visual examination of PMN monolayers (phagocytic index); uptake of radiolabeled S. typhi by PMNs; and removal of S. typhi from the supernatant of suspensions of PMNs and bacteria. All three techniques indicated equivalent phagocytosis of the strains. Postphagocytic PMN oxidative metabolism was quantitated with measurements of oxygen consumption, protein iodination, and chemiluminescence. We found that although PMNs ingested equal numbers of virulent and avirulent S. typhi, those PMNs ingesting the virulent organisms exhibited a significantly smaller increase in postphagocytic oxidative metabolism than PMNs ingesting avirulent S. typhi. Despite this muted oxidative burst the virulent bacteria were killed as well as the avirulent strains. Virulent S. typhi either fail to stimulate receptors that trigger PMN oxidative metabolism or inhibit PMN oxidative metabolism. Our data support the former hypothesis.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=351362Documentos Relacionados
- Molecular typing of Salmonella enterica serovar typhi.
- Spurious sulfamethoxazole-trimethoprim resistance of Salmonella typhi.
- Serological response of patients infected with Salmonella typhi.
- Sulfonamide and trimethoprim resistance in Salmonella typhi.
- Highly plastic chromosomal organization in Salmonella typhi.