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Infection and Immunity, March 2001, p. 1536-1546, Vol. 69, No. 3
0019-9567/01/$04.00+0   DOI: 10.1128/IAI.69.3.1536-1546.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Efficacy of Two Alternate Vaccines Based on Plasmodium falciparum Merozoite Surface Protein 1 in an Aotus Challenge Trial

Anthony W. Stowers,1,* Vittoria Cioce,2 Richard L. Shimp,1 Mark Lawson,1 George Hui,3 Olga Muratova,1 David C. Kaslow,1,dagger Robin Robinson,2 Carole A. Long,1 and Louis H. Miller1

Malaria Vaccine Development Unit, National Institute of Allergy and Infectious Diseases, National Institutes of Health,1 and Novavax, Inc.,2 Rockville, Maryland, and Department of Tropical Medicine and Medical Microbiology, University of Hawaii, Honolulu, Hawaii3

Received 13 September 2000/Returned for modification 20 November 2000/Accepted 1 December 2000

In an attempt to produce a more defined, clinical-grade version of a vaccine based on Plasmodium falciparum merozoite surface protein 1 (MSP1), we evaluated the efficacy of two recombinant forms of MSP1 in an Aotus nancymai challenge model system. One recombinant vaccine, bvMSP142, based on the 42-kDa C-terminal portion of MSP1, was expressed as a secreted protein in baculovirus-infected insect cells. A highly pure baculovirus product could be reproducibly expressed and purified at yields in excess of 8 mg of pure protein per liter of culture. This protein, when tested for efficacy in the Aotus challenge model, gave significant protection, with only one of seven monkeys requiring treatment for uncontrolled parasitemia after challenge with P. falciparum. The second recombinant protein, P30P2MSP119, has been used in previous studies and is based on the smaller, C-terminal 19-kDa portion of MSP1 expressed in Saccharomyces cerevisiae. Substantial changes were made in its production process to optimize expression. The optimum form of this vaccine antigen (as judged by in vitro and in vivo indicators) was then evaluated, along with bvMSP142, for efficacy in the A. nancymai system. The new formulation of P30P3MSP119 performed significantly worse than bvMSP142 and appeared to be less efficacious than we have found in the past, with four of seven monkeys in the vaccinated group requiring treatment for uncontrolled parasitemia. With both antigens, protection was seen only when high antibody levels were obtained by formulation of the vaccines in Freund's adjuvant. Vaccine formulation in an alternate adjuvant, MF59, resulted in significantly lower antibody titers and no protection.

* Corresponding author. Mailing address: Malaria Vaccine Development Unit, LPD/NIAID/NIH, Twinbrook II Room 103, 12441 Parklawn Dr., Rockville, MD 20852. Phone: (301) 435-2968. Fax: (301) 435-6725. E-mail: astowers{at}niaid.nih.gov.

dagger Present address: Viral and Vaccine Research, Merck Research Laboratories, West Point, PA 19486.

Infection and Immunity, March 2001, p. 1536-1546, Vol. 69, No. 3
0019-9567/01/$04.00+0   DOI: 10.1128/IAI.69.3.1536-1546.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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