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Infection and Immunity, June 2002, p. 2941-2949, Vol. 70, No. 6
0019-9567/02/$04.00+0     DOI: 10.1128/IAI.70.6.2941-2949.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Antigen-Presenting Cell Function during Plasmodium yoelii Infection

James Luyendyk,1 O. Renee Olivas,2 Lisa A. Ginger,2 and Anne C. Avery2*

Department of Pharmacology and Toxicology, Institute for Environmental Toxicology, National Food Safety and Toxicology Center, Michigan State University, East Lansing, Michigan 48824,,1 Department of Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, Colorado 805232

Received 16 November 2001/ Returned for modification 21 December 2001/ Accepted 25 February 2002

Antigen-presenting cells (APC) play a key role in orchestrating immune responses. T-cell proliferative responses are inhibited during the erythrocyte stages of malaria infection, and a number of studies have suggested that APC are responsible for this phenomenon. In the present studies we examine individual components of the T-cell-activating function of APC: expression of costimulatory and major histocompatibility complex (MHC) class II proteins, the ability to process and present antigen to T cells, and the ability to support cytokine production. We find that during the acute phases of Plasmodium yoelii erythrocyte stage infection, APC upregulate the expression of class II MHC and CD80, maintain expression of CD86, process and present antigen, and support gamma interferon production. However the CD11b+ subpopulation produces a soluble factor or factors that specifically inhibit interleukin-2 (IL-2) production by responding CD4 T cells. This factor is distinct from prostaglandin E2, NO, or transforming growth factor ß. The data suggest that IL-2 suppression observed during malaria infection is not due to functional defects of APC but is triggered by production of a factor(s) that actively suppresses production of IL-2 by T cells.

* Corresponding author. Mailing address: Department of Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523. Phone: (970) 491-1170. Fax: (970) 491-0603. E-mail: anne.avery{at}colostate.edu.

Editor: W. A. Petri, Jr.

Infection and Immunity, June 2002, p. 2941-2949, Vol. 70, No. 6
0019-9567/02/$04.00+0     DOI: 10.1128/IAI.70.6.2941-2949.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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