Effect of hyperbaric oxygen on murine neutrophil and T-lymphocyte functions.
We investigated the effect of repeated hyperbaric oxygen (HBO) exposure on PMN and T-lymphocyte functions in a murine model. Animals received eight 90-min exposures twice daily to 2.4 ata and 100% or 10% oxygen. Control animals were maintained in room air. On the ninth day spleens and peritoneal cell exudates were harvested. Phagocytosis was measured by flow-cytometric analysis of the ability of PMN to engulf formalin-killed, fluorescence-labeled Staphylococcus aureus. PMN-killing capacity was measured by the ability of PMN to undergo an oxidative burst after stimulation with N-formyl methionyl-leucyl-phenylalanine, phorbol myristate, or opsonized zymosan. T-lymphocyte subpopulations were identified using monoclonal antibodies and two-color flow cytometry after 48 h stimulation with phytohemagglutinin, and lymphocyte proliferation was measured by 3 H-thymidine incorporation. We found PMN phagocytosis and oxidative burst were unchanged after HBO treatment. Lymphocyte proliferation was decreased, and an activated population of CD8+ T cells appeared after mitogen stimulation. We conclude that, although PMN function is not affected by prior HBO, lymphocyte proliferation is decreased.
Gadd
M A
MA
Division of Surgery, University Hospital, San Diego, CA.
McClellan
D S
DS
Neuman
T S
TS
Hansbrough
J F
JF
D000818:Animals; D005260:Female; D006931:Hyperbaric Oxygenation; D008213:Lymphocyte Activation; D051379:Mice; D008815:Mice, Inbred Strains; D009504:Neutrophils / Q000276:immunology* / Q000378:metabolism; D010587:Phagocytosis; D013601:T-Lymphocytes / Q000276:immunology*