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Interferon gamma modulates trauma-induced muscle wasting and immune dysfunction.
Sundararajan V Madihally1, Mehmet Toner, Martin L Yarmush
1Center for Engineering in Medicine/Surgical Services, Massachusetts General Hospital, Harvard Medical School and Shriners Hospital for Children, Boston, Massachusetts 20115, USA.
Annals of Surgery
|November 1, 2002
Summary
Interferon gamma (IFN-gamma) is critical for burn-induced muscle wasting and immune dysfunction. Its absence in mice prevented weight loss and normalized immune responses after burn injury, highlighting its central role.
Area of Science:
- Immunology
- Trauma Research
- Muscle Physiology
Background:
- Burn injury triggers a hypercatabolic state, characterized by increased proteasomal degradation and muscle wasting.
- Burn trauma induces immunosuppression, increasing susceptibility to infections, a major cause of mortality.
- Interferon gamma (IFN-gamma), a key macrophage-activating cytokine, influences pathways relevant to muscle wasting and immune response.
Purpose of the Study:
- To investigate the role of IFN-gamma in the physiological response to burn injury.
- To assess the impact of IFN-gamma deficiency on muscle catabolism and immune function post-burn.
- To evaluate the effect of IFN-gamma neutralization on burn trauma outcomes in wild-type mice.
Main Methods:
- Mice were subjected to a 20% total body surface area burn or sham treatment.
- Skeletal muscle, blood, and spleen were analyzed at 1, 2, and 7 days post-injury.
- Assessed protein synthesis/degradation, lymphocyte MHC I expression, and proliferation capacity.
Main Results:
- Absence of IFN-gamma significantly reduced burn-induced weight loss and abolished skeletal muscle hypercatabolism.
- IFN-gamma deficiency normalized lymphocyte proliferation and MHC I expression following burn trauma.
- Both antigen presentation and lymphocyte proliferation functions were independently modulated by IFN-gamma.
Conclusions:
- IFN-gamma is a fundamental mediator of the hypercatabolic state observed in multiple cell types after burn trauma.
- Targeting IFN-gamma may offer therapeutic potential for mitigating burn-induced muscle wasting and immune suppression.