Immune Responses and Protection of Aotus Monkeys Immunized with Irradiated Plasmodium vivax Sporozoites

Alejandro Jordán-Villegas Instituto de Inmunología, Universidad del Valle, Cali, Colombia; Malaria Vaccine and Drug Development Center, Cali, Colombia; Hospital Universitario del Valle, Cali, Colombia; Universidad Nacional de Colombia, Palmira, Colombia; Naval Medical Research Center, U.S. Military Malaria Vaccine Program, Silver Spring, Maryland; Sanaria Inc., Rockville, Maryland

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Anilza Bonelo Perdomo Instituto de Inmunología, Universidad del Valle, Cali, Colombia; Malaria Vaccine and Drug Development Center, Cali, Colombia; Hospital Universitario del Valle, Cali, Colombia; Universidad Nacional de Colombia, Palmira, Colombia; Naval Medical Research Center, U.S. Military Malaria Vaccine Program, Silver Spring, Maryland; Sanaria Inc., Rockville, Maryland

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Judith E. Epstein Instituto de Inmunología, Universidad del Valle, Cali, Colombia; Malaria Vaccine and Drug Development Center, Cali, Colombia; Hospital Universitario del Valle, Cali, Colombia; Universidad Nacional de Colombia, Palmira, Colombia; Naval Medical Research Center, U.S. Military Malaria Vaccine Program, Silver Spring, Maryland; Sanaria Inc., Rockville, Maryland

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Jesús López Instituto de Inmunología, Universidad del Valle, Cali, Colombia; Malaria Vaccine and Drug Development Center, Cali, Colombia; Hospital Universitario del Valle, Cali, Colombia; Universidad Nacional de Colombia, Palmira, Colombia; Naval Medical Research Center, U.S. Military Malaria Vaccine Program, Silver Spring, Maryland; Sanaria Inc., Rockville, Maryland

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Alejandro Castellanos Instituto de Inmunología, Universidad del Valle, Cali, Colombia; Malaria Vaccine and Drug Development Center, Cali, Colombia; Hospital Universitario del Valle, Cali, Colombia; Universidad Nacional de Colombia, Palmira, Colombia; Naval Medical Research Center, U.S. Military Malaria Vaccine Program, Silver Spring, Maryland; Sanaria Inc., Rockville, Maryland

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María R. Manzano Instituto de Inmunología, Universidad del Valle, Cali, Colombia; Malaria Vaccine and Drug Development Center, Cali, Colombia; Hospital Universitario del Valle, Cali, Colombia; Universidad Nacional de Colombia, Palmira, Colombia; Naval Medical Research Center, U.S. Military Malaria Vaccine Program, Silver Spring, Maryland; Sanaria Inc., Rockville, Maryland

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Miguel A. Hernández Instituto de Inmunología, Universidad del Valle, Cali, Colombia; Malaria Vaccine and Drug Development Center, Cali, Colombia; Hospital Universitario del Valle, Cali, Colombia; Universidad Nacional de Colombia, Palmira, Colombia; Naval Medical Research Center, U.S. Military Malaria Vaccine Program, Silver Spring, Maryland; Sanaria Inc., Rockville, Maryland

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Liliana Soto Instituto de Inmunología, Universidad del Valle, Cali, Colombia; Malaria Vaccine and Drug Development Center, Cali, Colombia; Hospital Universitario del Valle, Cali, Colombia; Universidad Nacional de Colombia, Palmira, Colombia; Naval Medical Research Center, U.S. Military Malaria Vaccine Program, Silver Spring, Maryland; Sanaria Inc., Rockville, Maryland

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Fabián Méndez Instituto de Inmunología, Universidad del Valle, Cali, Colombia; Malaria Vaccine and Drug Development Center, Cali, Colombia; Hospital Universitario del Valle, Cali, Colombia; Universidad Nacional de Colombia, Palmira, Colombia; Naval Medical Research Center, U.S. Military Malaria Vaccine Program, Silver Spring, Maryland; Sanaria Inc., Rockville, Maryland

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Thomas L. Richie Instituto de Inmunología, Universidad del Valle, Cali, Colombia; Malaria Vaccine and Drug Development Center, Cali, Colombia; Hospital Universitario del Valle, Cali, Colombia; Universidad Nacional de Colombia, Palmira, Colombia; Naval Medical Research Center, U.S. Military Malaria Vaccine Program, Silver Spring, Maryland; Sanaria Inc., Rockville, Maryland

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Stephen L. Hoffman Instituto de Inmunología, Universidad del Valle, Cali, Colombia; Malaria Vaccine and Drug Development Center, Cali, Colombia; Hospital Universitario del Valle, Cali, Colombia; Universidad Nacional de Colombia, Palmira, Colombia; Naval Medical Research Center, U.S. Military Malaria Vaccine Program, Silver Spring, Maryland; Sanaria Inc., Rockville, Maryland

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Myriam Arévalo-Herrera Instituto de Inmunología, Universidad del Valle, Cali, Colombia; Malaria Vaccine and Drug Development Center, Cali, Colombia; Hospital Universitario del Valle, Cali, Colombia; Universidad Nacional de Colombia, Palmira, Colombia; Naval Medical Research Center, U.S. Military Malaria Vaccine Program, Silver Spring, Maryland; Sanaria Inc., Rockville, Maryland

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Sócrates Herrera Instituto de Inmunología, Universidad del Valle, Cali, Colombia; Malaria Vaccine and Drug Development Center, Cali, Colombia; Hospital Universitario del Valle, Cali, Colombia; Universidad Nacional de Colombia, Palmira, Colombia; Naval Medical Research Center, U.S. Military Malaria Vaccine Program, Silver Spring, Maryland; Sanaria Inc., Rockville, Maryland

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A non-human primate model for the induction of protective immunity against the pre-erythrocytic stages of Plasmodium vivax malaria using radiation-attenuated P. vivax sporozoites may help to characterize protective immune mechanisms and identify novel malaria vaccine candidates. Immune responses and protective efficacy induced by vaccination with irradiated P. vivax sporozoites were evaluated in malaria-naive Aotus monkeys. Three groups of six monkeys received two, five, or ten intravenous inoculations, respectively, of 100,000 irradiated P. vivax sporozoites; control groups received either 10 doses of uninfected salivary gland extract or no inoculations. Immunization resulted in the production low levels of antibodies that specifically recognized P. vivax sporozoites and the circumsporozoite protein. Additionally, immunization induced low levels of antigen-specific IFN-γ responses. Intravenous challenge with viable sporozoites resulted in partial protection in a dose-dependent manner. These findings suggest that the Aotus monkey model may be able to play a role in preclinical development of P. vivax pre-erythrocytic stage vaccines.

Author Notes

*Address correspondence to Sócrates Herrera, Malaria Vaccine and Drug Development Center, Carrera 37 - 2Bis No. 5E - 08, Cali, Colombia. E-mail: sherrera@inmuno.org

Financial support: This work was supported by grants from the Special Programme for Research and Training in Tropical Diseases, and by the U.S. National Institute of Allergy and Infectious Diseases (NIAID/TMRC contract no. AI49486-02), the UNDP/World Bank/World Health Organization, and the Instituto Colombiano Francisco José de Caldas para la Ciencia y la Tecnología (COLCIENCIAS).

Disclosure: Judith Epstein and Thomas L. Richie are military service members. This work was prepared as part of their official duties. Title 17 U.S.C. §105 provides that “Copyright protection under this title is not available for any work of the United States Government.” Title 17 U.S.C. §101 defines a U.S. Government work as a work prepared by a military service member or employee of the U.S. Government as part of that person's official duties. The views expressed in this article are those of the author and do not necessarily reflect the views of the U.S. Navy, Department of Defense, or the U.S. Government.

Authors' addresses: Alejandro Jordán-Villegas, Anilza Bonelo Perdomo, Alejandro Castellanos, Miguel A. Hernandez, Liliana Soto, Fabián Méndez, Myriam Arévalo-Herrera, and Sócrates Herrera, Instituto de Inmunología, Edificio de Microbiología, Facultad de Salud, Universidad del Valle and Centro Internacional de Vacunas, Cali, Colombia, E-mails: alejovi@hotmail.com, anbonelo@yahoo.com, alejcaste@yahoo.com, mhernandez@inmuno.org, lsoto@inmuno.org, famendez@univalle.edu.co, marevalo@inmuno.org, and sherrera@inmuno.org. Judith E. Epstein and Thomas L. Richie, Malaria Program, Naval Medical Research Center, U.S. Military Malaria Vaccine Program, Silver Spring, MD, E-mails: Judith.Epstein@med.navy.mil and Thomas.Richie@med.navy.mil. Jesús López, Hospital Universitario del Valle, Cali, Colombia, E-mail: jesus.lopez@hotmail.com. María R. Manzano, Departamento de Ciencias Agrícolas, Universidad Nacional de Colombia, Palmira, Colombia, E-mail: mrmanzanom@palmira.unal.edu.co. Stephen L. Hoffman, Sanaria, Inc., Rockville, MD, E-mail: slhoffman@sanaria.com.

Reprint requests: Sócrates Herrera, Malaria Vaccine and Drug Development Center, Carrera 37 - 2Bis No. 5E - 08, Cali, Colombia, E-mail: sherrera@inmuno.org.

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