Increased percentage of CD4+CD25+ regulatory T cells during septic shock is due to the decrease of CD4+CD25- lymphocytes.

Abstract:

OBJECTIVE:The elevation of the percentage of regulatory CD4+CD25+ T lymphocytes (Treg) has been recently described during septic shock. The objective of the present study was to investigate whether this increased percentage was due to Treg proliferation. DESIGN:Observational study. SETTING:Adult intensive care units in a university hospital. SUBJECTS:Patients with septic shock (n = 54) and healthy individuals (n = 30). INTERVENTIONS:None. MEASUREMENTS AND MAIN RESULTS:In patients, we first confirmed the increased percentage of Treg among CD4+ lymphocytes in comparison with healthy individuals. Surprisingly, regarding absolute counting, we demonstrated that both T CD4+ lineages (CD25+ and CD25-) were diminished immediately after the onset of shock. Then, whereas Treg returned rapidly to healthy donors values, CD4+CD25- T lymphocytes remained dramatically reduced. Finally, Foxp3 (Treg-related gene) messenger RNA quantification enabled us to definitively rule out a lack of proliferation since it was not increased during shock. CONCLUSION:The increased percentage of Treg after shock is due not to their proliferation but to a decrease in CD4+CD25- T lymphocyte number. We hypothesize that it might be due to a resistance of Treg to apoptosis processes occurring during septic shock.

journal_name

Crit Care Med

journal_title

Critical care medicine

authors

Venet F,Pachot A,Debard AL,Bohé J,Bienvenu J,Lepape A,Monneret G

doi

10.1097/01.ccm.0000145999.42971.4b

subject

Has Abstract

pub_date

2004-11-01 00:00:00

pages

2329-31

issue

11

eissn

0090-3493

issn

1530-0293

pii

00003246-200411000-00023

journal_volume

32

pub_type

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