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Estrogen mediates the sex difference in post-burn immunosuppression
M S Gregory1, L A Duffner, D E Faunce
1Burn and Shock Trauma Institute, Loyola University Medical Center, 2160 S. First Avenue, Maywood, Illinois 60153, U S A.
The Journal of Endocrinology
|February 5, 2000
Summary
Burn injury suppresses immune function in female mice, linked to increased estrogen (E2) and interleukin-6 (IL-6). Estrogen directly impairs cell-mediated immunity and enhances IL-6 production, explaining sex differences post-burn.
Area of Science:
- Immunology
- Endocrinology
- Trauma Research
Background:
- Cell-mediated immune function is suppressed in female mice post-burn, associated with elevated interleukin-6 (IL-6).
- 17beta-estradiol (E2) influences immune responses after trauma and regulates IL-6 production.
Purpose of the Study:
- To investigate the role of 17beta-estradiol (E2) in sex-specific immune suppression following thermal injury.
- To elucidate the mechanisms by which E2 affects cell-mediated immunity and cytokine production after burns.
Main Methods:
- Assessed delayed-type hypersensitivity (DTH) and splenocyte proliferation in female and male mice after burn injury.
- Measured circulating concentrations of E2 and IL-6.
- Utilized ovariectomy and exogenous E2 administration in mice.
- Performed in vitro studies on splenocyte proliferation and macrophage IL-6 production.
Main Results:
- Increased E2 levels correlated with suppressed DTH and splenocyte proliferation, and elevated IL-6 in female mice post-burn.
- Ovariectomy reversed DTH suppression and reduced IL-6 levels.
- Exogenous E2 administration suppressed DTH in both ovariectomized females and male mice.
- In vitro E2 suppressed splenocyte proliferation and enhanced macrophage IL-6 production.
Conclusions:
- Altered E2 concentrations mediate the sex difference in cell-mediated immunity observed 10 days after burn injury.
- E2 modulates macrophage-derived cytokines, including IL-6, impacting immune responses post-thermal injury.