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Science 10 January 1986:
Vol. 231. no. 4734, pp. 156 - 159
DOI: 10.1126/science.3510455
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Articles
Science, Vol 231, Issue 4734, 156-159
Copyright © 1986 by American Association for the Advancement of Science
Effect of antibodies to recombinant and synthetic peptides on P. falciparum sporozoites in vitro
D Mazier,
S Mellouk,
RL Beaudoin,
B Texier,
P Druilhe,
W Hockmeyer,
J Trosper,
C Paul,
Y Charoenvit,
J Young,
and
al. et
Antibodies were raised in mice immunized with several recombinant and synthetic peptides of the circumsporozoite protein of Plasmodium falciparum. The antibodies were evaluated for protective activity in a human hepatocyte culture system. They exerted their protective effect against the parasite at three points: sporozoite attachment to the hepatocyte surface, entry, and subsequent intracellular development. Inhibition of attachment and entry were found to be related to the antibody titer against the authentic circumsporozoite protein on the sporozoite surface, especially when peptides were administered with alum or complete Freund's adjuvant. Even when invasion was not totally inhibited, the presence of abnormal trophozoites and a frequent inhibition of schizont development in long-term cultures suggested continued activity of antibodies at the intracellular level after sporozoite penetration had been completed.
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