A functional enzymatic assay as potential readout for a clinical trial of a schistosomiasis vaccine
An estimated 200 million people are currently infected with schistosomiasis and an additional 800 million reside in high transmission-risk areas in 78 endemic countries. In this report we describe a functional enzymatic assay based on the core calpain antigen (Sm-p80) of the schistosomiasis vaccine,...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
13 March 2025
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| In: |
npj vaccines
Year: 2025, Jahrgang: 10, Pages: 1-5 |
| ISSN: | 2059-0105 |
| DOI: | 10.1038/s41541-024-01044-2 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.1038/s41541-024-01044-2 Verlag, kostenfrei, Volltext: https://www.nature.com/articles/s41541-024-01044-2 
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| Verfasserangaben: | Desalegn W. Kifle, Mumtaz Y. Balkhi, Yasuko Ono, Jenn Davis, Naoko Doi, Aryandra Arya, Jiho Kim, Aravindan Kalyanasundaram, Sourav Nandy, Njariharinjakamampionona Rakotozandrindrainy, Bart Staker, Justin Craig, Raphaël Rakotozandrindrainy, Birkneh T. Tadesse, Florian Marks, Lisa Jackson, Darrick Carter, Sean A. Gray & Afzal A. Siddiqui |
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| 245 | 1 | 2 | |a A functional enzymatic assay as potential readout for a clinical trial of a schistosomiasis vaccine |c Desalegn W. Kifle, Mumtaz Y. Balkhi, Yasuko Ono, Jenn Davis, Naoko Doi, Aryandra Arya, Jiho Kim, Aravindan Kalyanasundaram, Sourav Nandy, Njariharinjakamampionona Rakotozandrindrainy, Bart Staker, Justin Craig, Raphaël Rakotozandrindrainy, Birkneh T. Tadesse, Florian Marks, Lisa Jackson, Darrick Carter, Sean A. Gray & Afzal A. Siddiqui |
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| 520 | |a An estimated 200 million people are currently infected with schistosomiasis and an additional 800 million reside in high transmission-risk areas in 78 endemic countries. In this report we describe a functional enzymatic assay based on the core calpain antigen (Sm-p80) of the schistosomiasis vaccine, SchistoShield®. A 44 kDa soluble variant of the core Sm-p80 antigen (B7), was assessed for its enzymatic activity using a fluorescent synthetic substrate. Inhibition of the B7 enzymatic activity by Sm-p80-specific antibodies obtained from pre-clinical trials in rodents, non-human primates as well as from participants of the human clinical trials was measured. The B7 enzyme activity followed a Michaelis-Menten-like kinetic behavior. Statistically significant inhibition of the B7 activity was observed by Sm-p80-specific antibodies produced by immunized mice, non-human primates and humans. This quantitative serological assay could be of value in assessing the effectiveness of the SchistoShield® vaccine in human trials in Africa. | ||
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