Successful Immunization of Humans with Irradiated Malaria Sporozoites: Humoral and Cellular Responses of the Protected Individuals

Deirdre Herrington Center for Vaccine Development, Departments of Medicine and Pediatrics, and Department of Radiation Oncology, University of Maryland at Baltimore, Department of Medical and Molecular Parasitology, New York University School of Medicine, Biomedical Research Institute, Baltimore, Maryland

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Jonathan Davis Center for Vaccine Development, Departments of Medicine and Pediatrics, and Department of Radiation Oncology, University of Maryland at Baltimore, Department of Medical and Molecular Parasitology, New York University School of Medicine, Biomedical Research Institute, Baltimore, Maryland

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Elizabeth Nardin Center for Vaccine Development, Departments of Medicine and Pediatrics, and Department of Radiation Oncology, University of Maryland at Baltimore, Department of Medical and Molecular Parasitology, New York University School of Medicine, Biomedical Research Institute, Baltimore, Maryland

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Magda Beier Center for Vaccine Development, Departments of Medicine and Pediatrics, and Department of Radiation Oncology, University of Maryland at Baltimore, Department of Medical and Molecular Parasitology, New York University School of Medicine, Biomedical Research Institute, Baltimore, Maryland

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Joseph Cortese Center for Vaccine Development, Departments of Medicine and Pediatrics, and Department of Radiation Oncology, University of Maryland at Baltimore, Department of Medical and Molecular Parasitology, New York University School of Medicine, Biomedical Research Institute, Baltimore, Maryland

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Hubert Eddy Center for Vaccine Development, Departments of Medicine and Pediatrics, and Department of Radiation Oncology, University of Maryland at Baltimore, Department of Medical and Molecular Parasitology, New York University School of Medicine, Biomedical Research Institute, Baltimore, Maryland

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Genevieve Losonsky Center for Vaccine Development, Departments of Medicine and Pediatrics, and Department of Radiation Oncology, University of Maryland at Baltimore, Department of Medical and Molecular Parasitology, New York University School of Medicine, Biomedical Research Institute, Baltimore, Maryland

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Michael Hollingdale Center for Vaccine Development, Departments of Medicine and Pediatrics, and Department of Radiation Oncology, University of Maryland at Baltimore, Department of Medical and Molecular Parasitology, New York University School of Medicine, Biomedical Research Institute, Baltimore, Maryland

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Marcelo Sztein Center for Vaccine Development, Departments of Medicine and Pediatrics, and Department of Radiation Oncology, University of Maryland at Baltimore, Department of Medical and Molecular Parasitology, New York University School of Medicine, Biomedical Research Institute, Baltimore, Maryland

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Myron Levine Center for Vaccine Development, Departments of Medicine and Pediatrics, and Department of Radiation Oncology, University of Maryland at Baltimore, Department of Medical and Molecular Parasitology, New York University School of Medicine, Biomedical Research Institute, Baltimore, Maryland

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Ruth S. Nussenzweig Center for Vaccine Development, Departments of Medicine and Pediatrics, and Department of Radiation Oncology, University of Maryland at Baltimore, Department of Medical and Molecular Parasitology, New York University School of Medicine, Biomedical Research Institute, Baltimore, Maryland

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David Clyde Center for Vaccine Development, Departments of Medicine and Pediatrics, and Department of Radiation Oncology, University of Maryland at Baltimore, Department of Medical and Molecular Parasitology, New York University School of Medicine, Biomedical Research Institute, Baltimore, Maryland

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Robert Edelman Center for Vaccine Development, Departments of Medicine and Pediatrics, and Department of Radiation Oncology, University of Maryland at Baltimore, Department of Medical and Molecular Parasitology, New York University School of Medicine, Biomedical Research Institute, Baltimore, Maryland

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DOI:
https://doi.org/10.4269/ajtmh.1991.45.539
Volume/Issue:
Volume 45: Issue 5
Page(s):
539–547
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Two groups of volunteers were vaccinated by repeated exposure to the bites of Plasmodium falciparum-infected, x-irradiated mosquitoes in order to characterize the humoral and cellular immune responses of sporozoite-immunized, protected individuals. One of the two volunteers in the first immunization trial, when challenged by the bite of P. falciparum-infected mosquitoes, developed an infection only after a prolonged prepatent period. A second group of three volunteers who were exposed more frequently to larger numbers of infected mosquitoes irradiated with a lower x-ray dose was completely protected against sporozoite challenge. These individuals and the volunteer with delayed infection had high levels of antibodies to sporozoites and to the repeat region of the circumsporozoite (CS) protein. The CS-specific cellular immune responses of these volunteers were also stimulated by sporozoite immunization, as determined by proliferation of peripheral blood mononuclear cells (PBMC) and mitogen or antigen-expanded PBMC, in response to in vitro challenge with a recombinant P. falciparum CS protein. Based upon the assays used in this study, it is not possible to reach conclusions regarding specific immunologic responses and protection from sporozoite challenge.

Author Notes

Copyright:
Copyright © 1991 by The American Society of Tropical Medicine and Hygiene 1991
Published Online:
Nov 1991
Cover The American Journal of Tropical Medicine and Hygiene
The American Journal of Tropical Medicine and Hygiene
Print ISSN:
0002-9637
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