Protective Efficacy Induced by Genetically Attenuated Mid-to-Late Liver-Stage Arresting Plasmodium berghei Deltamrp2 Parasites
SourceAmerican Journal of Tropical Medicine and Hygiene, 95, 2, (2016), pp. 378-82
Article / Letter to editor
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IMM - Institute for Molecules and Materials
American Journal of Tropical Medicine and Hygiene
SubjectRadboudumc 11: Renal disorders RIMLS: Radboud Institute for Molecular Life Sciences; Radboudumc 4: lnfectious Diseases and Global Health RIHS: Radboud Institute for Health Sciences; Radboudumc 4: lnfectious Diseases and Global Health RIMLS: Radboud Institute for Molecular Life Sciences
Whole parasite immunization strategies employing genetically attenuated parasites (GAP), which arrest during liver-stage development, have been applied successfully for induction of sterile malaria protection in rodents. Recently, we generated a Plasmodium berghei GAP-lacking expression of multidrug resistance-associated protein (MRP2) (PbDeltamrp2) that was capable of partial schizogony in hepatocytes but showed complete growth arrest. Here, we investigated the protective efficacy after intravenous (IV) immunization of BALB/c and C57BL/6J mice with PbDeltamrp2 sporozoites. Low-dose immunization using 400 PbDeltamrp2 sporozoites induced 100% sterile protection in BALB/c mice after IV challenge with 10,000 wild-type sporozoites. In addition, almost full protection (90%) was obtained after three immunizations with 10,000 sporozoites in C57BL/6J mice. Parasite liver loads in nonprotected PbDeltamrp2-challenged C57BL/6J mice were reduced by 86% +/- 5% on average compared with naive control mice. The mid-to-late arresting PbDeltamrp2 GAP was equipotent in induction of protective immunity to the early arresting PbDeltab9Deltaslarp GAP. The combined data support a clear basis for further exploration of Plasmodium falciparum parasites lacking mrp2 as a suitable GAP vaccine candidate.
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