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Comparative Study
Journal Article
Research Support, U.S. Gov't, P.H.S.
Review
Effect of gender and sex hormones on immune responses following shock.
Shock 2000 August
Several clinical and experimental studies show a gender dimorphism of the immune and organ responsiveness in the susceptibility to and morbidity from shock, trauma, and sepsis. In this respect, cell-mediated immune responses are depressed in males after trauma-hemorrhage, whereas they are unchanged or enhanced in females. Sex hormones contribute to this gender-specific immune response after adverse circulatory conditions. Specifically, studies indicate that androgens are responsible for the immunodepression after trauma-hemorrhage in males. In contrast, female sex steroids seem to exhibit immunoprotective properties after trauma and severe blood loss, because administration of estrogen prevents the androgen-induced immunodepression in castrated male mice. Nonetheless, the precise underlying mechanisms for these immunomodulatory effects of sex steroids after shock remain unknown. Although testosterone depletion, testosterone receptor antagonism, or estrogen treatment has been shown to prevent the depression of immune functions after trauma-hemorrhage, it remains to be established whether differences in the testosterone-estradiol ratio are responsible for the immune dysfunction. Furthermore, sex hormone receptors have been identified on various immune cells, suggesting direct effects. Thus, the immunomodulatory properties of sex hormones after trauma-hemorrhage might represent novel therapeutic strategies for the treatment of immunodepression in trauma patients.
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