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Interleukin-2 receptor expression and function following thermal injury
D S O'Riordain1, M V Mendez, R G Holzheimer
1Department of Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, Mass.
Archives of Surgery (Chicago, Ill. : 1960)
|February 1, 1995
Summary
Serious thermal injury impairs T-cell function, but this study shows interleukin-2 receptor (IL-2R) is not suppressed. Impaired T-cell proliferation after burns is mainly due to abnormal IL-2 production.
Area of Science:
- Immunology
- Cellular Biology
- Trauma Research
Background:
- Traumatic and thermal injuries suppress cellular immunity, impacting T-lymphocyte function.
- Interleukin-2 (IL-2) production and IL-2 receptor (IL-2R) expression are critical for T-cell proliferation.
- Previous studies present conflicting data on IL-2R status post-thermal injury.
Purpose of the Study:
- To investigate the expression and function of IL-2R following thermal injury.
- To determine the primary cause of suppressed T-cell activation after burns.
Main Methods:
- Male A/J mice underwent scald burn injury or sham procedure.
- Splenocytes were harvested at various time points post-injury (4-21 days).
- In vitro assays measured IL-2R expression, IL-2 production, and T-cell proliferation.
Main Results:
- Burn injury suppressed splenic lymphocyte proliferation and IL-2 production.
- IL-2R p55 mRNA and protein expression remained normal in thermally injured mice.
- IL-2R binding increased, and exogenous IL-2 restored T-cell responses in burned mice.
Conclusions:
- Thermal injury does not cause quantitative or functional IL-2R suppression in this model.
- Suppressed T-cell activation post-thermal injury is primarily linked to defective IL-2 production.