Parasitology: Effect of CD4[+] CD25[+] T cell-depletion on acute lethal infection of mice with Trypanosoma congolense

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  • NAMANGALA Boniface
    National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine Faculty of Veterinary Medicine, The University of Zambia
  • YOKOYAMA Naoaki
    National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine
  • IKEHARA Yuzuru
    National Institute of Advanced Industrial Science and Technology
  • TAGUCHI Osamu
    Aichi Cancer Center Research Institute
  • TSUJIMURA Kunio
    Hamamatsu University School of Medicine
  • SUGIMOTO Chihiro
    Research Center for Zoonosis Control, Hokkaido University
  • INOUE Noboru
    National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine

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  • Effect of CD4+CD25+ T Cell-Depletion on Acute Lethal Infection of Mice with Trypanosoma congolense

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Despite the immense socio-economic repercussions of African trypanosomosis (AT), there is currently no effective control measure against the disease. Characterization of mechanisms governing resistance and/or susceptibility to AT could suggest interventions that might lead to more effective disease control. The present study was designed in an attempt to address the possible role of CD4+CD25 + T cells during an acute lethal infection of mice with Trypanosoma congolense, the causative agent of AT in domestic animals, through selective depletion using anti-CD25 monoclonal antibody. Accordingly, CD4+CD25+ T-cell-depletion resulted in a significant reduction or delay in parasitemia, pathology, and mortality, as compared to controls. The apparent resistance in CD4+CD25 +-T-cell-depleted mice correlated with a profound suppression of Th2 cytokines in vitro and in vivo, culminating in a net Th1 cytokine environment. Cumulatively, these findings suggest that CD4+CD25+ T-cell- depletion improves the trypanotolerance of highly susceptible BALB/c mice acutely infected with the lethal T. congolense.<br>

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