Sex differences in inflammatory cytokines and CD99 expression following in vitro lipopolysaccharide stimulation

Shock
Nicolas LefevreGeorges Ja Casimir

Abstract

Sex influences the severity and evolution of various inflammatory conditions. Although many studies have demonstrated the role of sex hormones in immune response modulation, recent clinical data revealed significant sex differences in inflammatory markers in prepubertal children, suggesting a genetic contribution. We studied several immune functions depending on X-linked genes in healthy adults of both sexes: the respiratory burst of purified neutrophils, the CD99 and CD11b expression of stimulated leukocytes as markers of adhesion and diapedesis, and the production of inflammatory cytokines in whole blood after incubation with lipopolysaccharide for 24 h. The percentage of monocytes expressing CD99 was higher in men than in women, thus confirming the higher CD99 expression reported in males using reverse transcription-polymerase chain reaction. In addition, we observed a higher tumor necrosis factor α and tendency toward higher interleukin (IL) 6 production in men after lipopolysaccharide stimulation. These differences may contribute to the higher mortality reported in men with septic shock. Tumor necrosis factor α production significantly correlated with monocyte count, with men having a higher monocyte count than women. When...Continue Reading

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Citations

Oct 17, 2013·Biology of Sex Differences·Georges J CasimirJean Duchateau
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