Cutting Edge: An mRNA Platform to Create Isolated, Monospecific Th1 Responses
Krauss, K. S. L. B.; Carro, S.; Hogan, M. J.; Eisenlohr, L. C.
Show abstract
Helper T cells (TCD4) are lynchpins of adaptive immune responses. Since each TCD4 expresses a single T cell receptor, recognizing an epitope within major histocompatibility complex class II (MHCII), it is often desirable to study a population that responds to the same epitope. We devised a novel method of selective immunization to produce a robust, monospecific TCD4 in mice using a modular mRNA vector. The vector encodes the target epitope attached via flexible linker to MHCII. Immunization with this mRNA selectively elicits TCD4 responses across a range of epitopes and MHCII alleles. These TCD4 show robust, polyfunctional Th1 cytokine release when evaluated in vitro. Additionally, we tested the activity of these TCD4 cells during Salmonella enterica infection, a model of Th1-dependent immune response, and demonstrated their efficacy in vivo in curtailing infection.
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