More time to kill: A longer liver stage increases T cell-mediated protection against pre-erythrocytic malaria.

ABSTRACT: Liver stage (LS) Plasmodia mature in 2-2.5 days in rodents compared to 5-6 days in humans. Plasmodium-specific CD8⁺ T cell expansion differs across these varied timespans. To mimic the kinetics of CD8⁺ T cells of human Plasmodium infection, a two-dose challenge mouse model that achieved 4-5 days of LS antigen exposure was developed. In this model, mice were inoculated with a non-protective, low dose of late-arresting, genetically attenuated sporozoites to initiate T cell activation and then re-inoculated 2-3 days later with wild-type sporozoites. Vaccines that partially protected against traditional challenge completely protected against two-dose challenge. During the challenge period, CD8⁺ T cell frequencies increased in the livers of two-dos

SUBMITTER: Yadav N 

PROVIDER: S-EPMC10755051 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature