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Regulatory activity of activated murine peripheral CD4+CD25- T cells: a possible mechanism of feedback regulation on adaptive immunity

Regulatory activity of activated murine peripheral CD4+CD25- T cells: a possible mechanism of feedback regulation on adaptive immunity

Scandinavian Journal of Immunology 64(5): 500-506

This study was undertaken to investigate the possibility that peripheral CD4+CD25- T cells, once fully activated, transiently obtain suppressive function against other T cells. CD4+CD25- T cells, isolated from splenocytes of BALB/c mice, were stimulated with anti-CD3 MoAb in the presence of feeder cells for 72 h. The activated CD4+ T cells (T(act)) thus obtained were able to inhibit the activation and proliferation of bystander CD4+ T cells in a non-MHC-restricted manner. T(act)-mediated suppression was cell contact dependent, reversible by exogenous IL-2 as well as anti-GITR antibody. Furthermore, adoptive transfer of T(act) cells significantly downregulated humoral response of BALB/c mice to s.c. immunization with ovalbumin. We argue that suppression mediated by activated CD4+CD25- T cells may play an important role in maintaining homeostasis of the immune system and preventing excessive T-cell responses in vivo.

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Accession: 012499533

Download citation: RISBibTeXText

PMID: 17032242

DOI: 10.1111/j.1365-3083.2006.01842.x

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