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Infection and Immunity, December 2000, p. 6618-6623, Vol. 68, No. 12
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Antibodies to Malaria Vaccine Candidates Pvs25 and Pvs28 Completely Block the Ability of Plasmodium vivax To Infect Mosquitoes

Hajime Hisaeda,1,2 Anthony W. Stowers,1,* Takafumi Tsuboi,3 William E. Collins,4 Jetsumon S. Sattabongkot,5 Natavadee Suwanabun,5 Motomi Torii,3 and David C. Kaslow1,dagger

Malaria Vaccine Development Unit, Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland 208521; Department of Parasitology and Immunology, University of Tokushima School of Medicine, Tokushima 770-8503,2 and Department of Molecular Parasitology, Ehime University School of Medicine, Shigenobu-cho, Ehime 791-0295,3 Japan; Division of Parasitic Diseases and Animal Resources Branch, Scientific Resources Program, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Chamblee, Georgia 303414; and Department of Entomology, Armed Forces Research Institute of Medical Sciences, Phayathai, Bangkok 10400, Thailand5

Received 21 July 2000/Returned for modification 6 September 2000/Accepted 16 September 2000

Transmission-blocking vaccines are one strategy for controlling malaria, whereby sexual-stage parasites are inhibited from infecting mosquitoes by human antibodies. To evaluate whether the recently cloned Plasmodium vivax proteins Pvs25 and Pvs28 are candidates for a transmission-blocking vaccine, the molecules were expressed in yeast as secreted recombinant proteins. Mice vaccinated with these proteins adsorbed to aluminum hydroxide developed strong antibody responses against the immunogens, although for Pvs28, this response was genetically restricted. Antisera against both recombinant Pvs25 and Pvs28 recognized the corresponding molecules expressed by cultured sexual-stage parasites isolated from patients with P. vivax malaria. The development of malaria parasites in mosquitoes was completely inhibited when these antisera were ingested with the infected blood meal. Pvs25 and Pvs28, expressed in Saccharomyces cerevisiae, are as yet the only fully characterized transmission-blocking vaccine candidates against P. vivax that induce such a potent antiparasite response.

* Corresponding author. Mailing address: Malaria Vaccine Development Unit, Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, 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 Labs, West Point, PA 19486.

Infection and Immunity, December 2000, p. 6618-6623, Vol. 68, No. 12
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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