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The Journal of Immunology, Vol 158, Issue 3 1268-1274, Copyright © 1997 by American Association of Immunologists
ARTICLES |
EG Rodrigues, F Zavala, D Eichinger, JM Wilson and M Tsuji
Department of Medical and Molecular Parasitology, New York University School of Medicine, New York, NY 10010, USA.
The immunogenicity of a recombinant replication defective adenovirus expressing a major malaria Ag, the circumsporozoite (CS) protein (AdPyCS), was determined using a rodent malaria model. A single immunizing dose of this construct induced a large number of CS-specific CD8+ and CD4+ T cells in the spleens of these animals, particularly when given by the s.c. or i.m. route. A single dose of AdPyCS also induced high titers of Abs to Plasmodium yoelii sporozoites in mice. No other form of presentation of the CS protein given as a single immunizing dose, i.e., irradiated sporozoites, recombinant vaccinia, or influenza virus, etc., elicits comparably high numbers of CS-specific CD8+ T cells. The high concentration of CS-specific CD8+ T cells in the spleen was relatively short-lived, decreasing to half of its original value by 4 wk and to one-third at 8 wk after AdPyCS inoculation. The decrease in splenic CS-specific CD4+ T cells was even more rapid. Most importantly, a single dose of inoculation of AdPyCS into mice rendered them highly resistant to sporozoite challenge, resulting in a 93% inhibition of liver stage development of the parasites. This protective effect was primarily mediated by CD8+ T cells, as shown by depletion of this T cell population, while depletion of the CD4+ T cell population had only a minor effect on anti-plasmodial activity. Moreover, the inoculation of mice with AdPyCS induces sterile immunity in a significant proportion of mice, preventing the occurrence of parasitemia.
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