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Infection and Immunity, November 2000, p. 6127-6132, Vol. 68, No. 11
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Early Nonspecific Immune Responses and Immunity to Blood-Stage Nonlethal Plasmodium yoelii Malaria

Hasib R. Choudhury,¹ Nadeem A. Sheikh,^1, Gregory J. Bancroft,² David R. Katz,¹ and J. Brian de Souza^1,*

Department of Immunology, Royal Free and University College London Medical School, Windeyer Institute of Medical Science, London W1P 6DB,¹ and Department of Infectious Diseases, London School of Hygiene and Tropical Medicine, London WC1E 7HT,² United Kingdom

Received 8 May 2000/Returned for modification 16 July 2000/Accepted 1 August 2000

The early role of natural killer cells and gamma delta T cells in the development of protective immunity to the blood stage of nonlethal Plasmodium yoelii infection was studied. Splenic cytokine levels were measured 24 h after infection of natural killer cell-depleted immunodeficient and littermate mice or transiently T-cell-depleted normal mice. Splenic gamma interferon levels were significantly increased above background in immunodeficient and littermate mice 24 h after infection. Depletion of natural killer cells resulted in markedly depressed gamma interferon levels and poor control of parasitemia, particularly in severe combined immunodeficient mice. In the littermates, gamma interferon levels were partially reduced, but parasitemias were resolved normally. However, in athymic mice, natural killer cell depletion had no effect on gamma interferon production. Levels of tumor necrosis factor alpha were increased in all animals 24 h after infection, and responses were not affected by natural killer cell depletion. However, in T-cell-depleted animals, both gamma interferon and tumor necrosis factor alpha levels were decreased 24 h after infection, and depleted mice were unable to control their parasitemia. These results suggest that the early production of both cytokines is important in the early control of parasitemia and that both natural killer and gamma delta T cells contribute equally towards their production. The data also suggest that the subsequent resolution of infection requires early production of gamma interferon, which might act by switching on the appropriate T-helper-cell subsets and other essential parasitotoxic effector mechanisms.

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^* Corresponding author. Mailing address: Department of Immunology, Royal Free and University College London Medical School, Windeyer Institute of Medical Science, 46 Cleveland St., London W1P 6DB, United Kingdom. Phone: 44-020 7679 9354. Fax: 44-020 7679 9357. E-mail: J.deSouza{at}ucl.ac.uk.

Present address: RPRC, University of Washington, Seattle, WA 98121.

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Infection and Immunity, November 2000, p. 6127-6132, Vol. 68, No. 11
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

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