Abstract
A CD1d-binding, invariant (i) natural killer T (NKT)-cell stimulatory glycolipid, α-Galactosylceramide (αGalCer), has been shown to act as an adjuvant. We previously identified a fluorinated phenyl ring-modified αGalCer analog, 7DW8-5, displaying a higher binding affinity for CD1d molecule and more potent adjuvant activity than αGalCer. In the present study, 7DW8-5 co-administered intramuscularly (i.m.) with a recombinant adenovirus expressing a Plasmodium yoelii circumsporozoite protein (PyCSP), AdPyCS, has led to a co-localization of 7DW8-5 and a PyCSP in draining lymph nodes (dLNs), particularly in dendritic cells (DCs). This occurrence initiates a cascade of events, such as the recruitment of DCs to dLNs and their activation and maturation, and the enhancement of the ability of DCs to prime CD8+ T cells induced by AdPyCS and ultimately leading to a potent adjuvant effect and protection against malaria.
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