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Erschienen in:
01.05.2007 | Original Article
Depressed T cell-derived IFN-γ following trauma-hemorrhage: a potential mechanism for diminished APC responses
Erschienen in: Langenbeck's Archives of Surgery | Ausgabe 3/2007
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Introduction
Prolonged immunosuppression has been demonstrated after trauma-hemorrhage resulting in an increased susceptibility to sepsis. The contribution of antigen-presenting cells (APC) vs T cells to this diminished immune response, however, remains unknown.
Materials and methods
To study this, male mice were trauma-hemorrhaged (35 ± 5 mmHg for 90 min and resuscitation) or sham operated. At 24 h thereafter, spleens were harvested and T cells (via Microbeads) and APC (via adherence) were isolated. Cocultures of combined T cells and APC were established for 48 h, stimulated with ConA and LPS. The T cell-derived cytokine IFN-γ and IL-12 for APC responses were measured in the supernatants by the multiplex assay.
Results
The release of IFN-γ was suppressed by T cells after trauma-hemorrhage irrespective of whether sham or trauma-hemorrhage APC were added. Trauma-hemorrhaged APC did not affect T cells-derived IFN-γ release by sham T cells. In contrast, trauma-hemorrhaged T cells depressed the release of IL-12 by APC. The release of IL-12 by trauma-hemorrhaged APC was not altered when sham T cells were cocultured.
Conclusion
Prolonged immunosuppression after trauma-hemorrhage appears to be predominantly due to diminished T cell function. Thus, attempts to prevent immunodysfunction should be directed towards T cells.