Published in:
01-04-2009 | Original
Increased circulating regulatory T cells (CD4+CD25+CD127−) contribute to lymphocyte anergy in septic shock patients
Authors:
Fabienne Venet, Chun-Shiang Chung, Hakim Kherouf, Anne Geeraert, Chistophe Malcus, Françoise Poitevin, Julien Bohé, Alain Lepape, Alfred Ayala, Guillaume Monneret
Published in:
Intensive Care Medicine
|
Issue 4/2009
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Abstract
Purpose
Sepsis syndrome represents the leading cause of death in intensive care unit. Patients present features consistent with a decline in immune responsiveness potentially contributing to mortality. We investigated whether CD4+CD25+ regulatory T cells (Treg) participate in the induction of lymphocyte anergy after sepsis.
Method
Observational study in septic shock patients and experimental study in mice.
Results
We took advantage of the recently described flow cytometric gating strategy using the measurement of CD25 and CD127 expressions for monitoring Treg (CD4+CD25+CD127−Foxp3+). In patients the increased circulating Treg percentage significantly correlated with a decreased lympho-proliferative response. In a murine model of sepsis mimicking these observations, the ex vivo downregulation of Foxp3 expression using siRNA was associated with a restoration of this response.
Conclusion
The relative increase in circulating Treg might play a role in lymphocyte anergy described after septic shock and represent a standardizable surrogate marker of declining proliferative capacity after sepsis.