Phenotypic and functional characterization of blood gammadelta T cells in sleep apnea.
Hypoxia-induced lymphocyte dysfunction may be implicated in endothelial cell damage in obstructive sleep apnea (OSA) syndrome. gammadelta T cells' unique migration, cytotoxic features, and accumulation in atherosclerotic plaques are considered critical in cardiovascular disorders. We characterized the phenotype, cytokine profile, adhesion properties, and cytotoxicity of gammadelta T cells in patients with OSA and control subjects. The following is a summary of our major findings regarding OSA gammadelta T cells: (1) a significant increase in the expression of the inhibitory natural killer B1 receptors was found; (2) the intracellular content of proinflammatory cytokines tumor necrosis factor (TNF)-alpha and interleukin-8 was increased, and the content of the antiinflammatory cytokine interleukin-10 was decreased; (3) gammadelta T cells of patients with OSA adhered significantly more avidly to nonactivated endothelial cells in culture than those of control subjects; (4) L-selectin expression was higher; (5) anti-E/P-selectin antibodies and anti-TNF-alpha antibodies decreased the adhesion index of OSA gammadelta T lymphocytes/endothelial cells but not of control subjects; and (6) cytotoxicity of OSA gammadelta T lymphocytes against endothelial cells in culture was 2.5-fold higher than that of control subjects and could be prevented by pretreatment with anti-TNF-alpha. Collectively these data implicate gammadelta T lymphocyte function in atherogenic sequelae in OSA.
Unit of Anatomy and Cell Biology, The Bruce Rappaport Faculty of Medicine, Technion, POB 9649, 31096 Haifa, Israel.
Larissa
L
Dyugovskaya
Peretz
P
Lavie
Lena
L
Lavie
D001161:Arteriosclerosis / Q000276:immunology; D016022:Case-Control Studies; D016207:Cytokines / Q000276:immunology; D003601:Cytotoxicity Tests, Immunologic; D004730:Endothelium, Vascular / Q000166:cytology; D005260:Female; D006801:Humans; D016130:Immunophenotyping; D008297:Male; D008875:Middle Aged; D016692:Receptors, Antigen, T-Cell, gamma-delta / Q000276:immunology*; D020181:Sleep Apnea, Obstructive / Q000097:blood* / Q000276:immunology
D016207:Cytokines; D016692:Receptors, Antigen, T-Cell, gamma-delta