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• W2079773088 abstract "Hookworms digest hemoglobin from erythrocytes via a proteolytic cascade that begins with the aspartic protease, APR-1. Ac-APR-1 from the dog hookworm, Ancylostoma caninum, protects dogs against hookworm infection via antibodies that neutralize enzymatic activity and interrupt blood-feeding. Toward developing a human hookworm vaccine, we expressed both wild-type (Na-APR-1wt) and mutant (Na-APR-1mut—mutagenesis of the catalytic aspartic acids) forms of Na-APR-1 from the human hookworm, Necator americanus. Refolded Na-APR-1wt was catalytically active, and Na-APR-1mut was catalytically inactive but still bound substrates. Vaccination of canines with Na-APR-1mut and heterologous challenge with A. caninum resulted in significantly reduced parasite egg burdens (P=0.034) and weight loss (P=0.022). Vaccinated dogs also had less gut pathology, fewer adult worms, and reduced blood loss compared to controls but these did not reach statistical significance. Vaccination with Na-APR-1mut induced antibodies that bound the native enzyme in the parasite gut and neutralized enzymatic activity of Na-APR-1wt and APR-1 orthologues from three other hookworm species that infect humans. IgG1 against Na-APR-1mut was the most prominently detected antibody in sera from people resident in high-transmission areas for N. americanus, indicating that natural boosting may occur in exposed humans. Na-APR-1mut is now a lead antigen for the development of an antihematophagy vaccine for human hookworm disease.—Pearson, M. S., Bethony, J. M., Pickering, D. A., de Oliveira, L. M., Jariwala, A., Santiago, H., Miles, A. P., Zhan, B., Jiang, D., Ranjit, N., Mulvenna, J., Tribolet, L., Plieskatt, J., Smith, T., Bottazzi, M. E., Jones, K., Keegan, B., Hotez, P. J., Loukas, A. An enzymatically inactivated hemoglobinase from Necator americanus induces neutralizing antibodies against multiple hookworm species and protects dogs against heterologous hookworm infection. FASEB J. 23, 3007–3019 (2009). www.fasebj.org" @default.
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• W2079773088 date "2009-04-20" @default.
• W2079773088 modified "2023-09-22" @default.
• W2079773088 title "An enzymatically inactivated hemoglobinase from<i>Necator americanus</i>induces neutralizing antibodies against multiple hookworm species and protects dogs against heterologous hookworm infection" @default.
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• W2079773088 doi "https://doi.org/10.1096/fj.09-131433" @default.
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