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Journal of Biomedicine and Biotechnology
Volume 2010, Article ID 786078, 9 pages
Research Article

Reduction of Foxp Cells by Depletion with the PC61 mAb Induces Mortality in Resistant BALB/c Mice Infected with Toxoplasma gondii

Departamento de Inmunología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Apartado Postal 70228, C.U., CP 04510, Mexico City, Mexico

Received 30 June 2009; Revised 9 September 2009; Accepted 14 September 2009

Academic Editor: Luis I. Terrazas

Copyright © 2010 Eda Patricia Tenorio et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Regulatory T cells (Tregs) are cells that modulate autoimmune responses. Tregs have been shown to be also involved during the immune response against infectious agents. The aim of this work is to study the role of Tregs during the infection with the intracellular protozoan Toxoplasma gondii. Resistant BALB/c mice were injected with 200  g of anti-CD25 mAb (clone PC61) and 2 days later they were infected with 20 cysts of the ME49 strain of T. gondii. We observed that depleted mice showed 50–60% mortality during the acute infection. When FACS analysis was carried out, we observed that although injection of PC61 mAb eliminated 50% of Tregs, infected-depleted mice showed a similar percentage of CD25+Foxp3 (activated T cells, Tact) to those observed in infected nondepleted animals, demonstrating that in our depletion/infection system, injection of PC61 mAb did not hamper T cell activation while percentage of Tregs was reduced by 75% 10 days post infection. We concluded that Tregs are essential during protection in the acute phase of T. gondii infection.