Role of the Phagocyte in Host-Parasite Interactions XI. Relationship Between Stimulated Oxidative Metabolism and Hydrogen Peroxide Formation, and Intracellular Killing
AUTOR(ES)
McRipley, R. J.
RESUMO
The increased respiratory and hexose monophosphate activities noted in phagocytizing cells results in the formation of hydrogen peroxide. This is brought about by the oxidation of reduced nicotinamide adenine dinucleotide phosphate by its oxidase. Evidence is presented which indicates that this H2O2 is involved in the intracellular killing of bacteria. When molecular oxygen was excluded from phagocytizing leukocytes by anaerobiosis, thus inhibiting H2O2 formation, reduced intracellular killing was observed. In some cases the impairment of leukocytic bactericidal activity by anaerobiosis could be partially reversed by the addition of H2O2. Exogenous catalase also could reduce intracellular killing. In addition, when leukocytic isolates were dialyzed so as to reduce endogenous H2O2, the bactericidal activity of the leukocytes was significantly decreased under both aerobic and anaerobic conditions. These results occurred with both guinea pig and human leukocytes and with several test microorganisms.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=276841Documentos Relacionados
- Role of the Phagocyte in Host-Parasite Interactions XII. Hydrogen Peroxide-Myeloperoxidase Bactericidal System in the Phagocyte
- Role of the Phagocyte in Host-Parasite Interactions XXVII. Myeloperoxidase-H2O2-Cl−-Mediated Aldehyde Formation and Its Relationship to Antimicrobial Activity
- Host–parasite interactions and the evolution of ploidy
- Roles of metallic ions in host-parasite interactions.
- Periodic and chaotic host-parasite interactions in human malaria.
