Late-stage parasite blockers could turn mosquito bites into malaria vaccine boosters
Researchers from WEHI (Melbourne, Australia) have discovered a new way to help prevent malaria that could one day transform mosquito bites from a source of deadly infection into immunity boosters against the disease.
Researchers from WEHI in Melbourne, Australia have developed a novel vaccination approach that could turn mosquito bites into malaria vaccine boosters. The team demonstrated that pairing mosquito-delivered malaria parasites with a class of antimalarial drug compounds can prime the immune system to fight the disease. When subsequent mosquito bites occur, they act as boosters, strengthening the immune response and providing durable protection against malaria.
This approach protected mice against malaria for the duration of the study, representing a significant breakthrough in the field. The compounds work by blocking the parasite's development at a critical stage in its life cycle, preventing disease and triggering a robust immune response. Importantly, the immune response generated requires only a small dose of parasites but provides broader and longer-lasting protection compared to most current vaccine approaches.
Researchers hope that this method could enable a "vaccinate and boost naturally" approach, where repeated natural mosquito bites in endemic areas gradually build long-term immunity. The antimalarial drug candidates used in the study, WM382 and MK-7602, are dual inhibitors of plasmepsin IX and X, two key enzymes crucial for parasite survival.
These compounds are the result of a decade-long research collaboration between WEHI and MSD. If successful, this approach could revolutionize malaria prevention by turning the very thing that spreads the disease—mosquito bites—into a means of building immunity over time.
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