A manganese-mediated mRNA core may let lipid mRNA vaccines use less lipid while improving uptake and immune responses.
Evidence
This formulation and platform experiment engineered L@Mn-mRNA nanoparticles and compared them with conventional LNP-mRNA for mRNA loading, cellular uptake, antigen-specific immune responses, therapeutic efficacy, lipid and mRNA compatibility, and anti-PEG IgG/IgM risk.
Caveat
The abstract does not specify human testing, and the efficacy and safety claims come from platform experiments rather than clinical vaccine outcomes.
Simplified
(LNPs) are the most clinically relevant vehicles for mRNA vaccines. Despite the great successes, the toxicity caused by the high dose of lipid components still represents a great challenge. The suboptimal loading capacity of mRNA in LNPs not only compromises the vaccine's efficacy but also heightens the risk of non-specific immune responses, accelerates clearance caused by anti-PEG IgG/IgM. These problems underscore the urgent need for improving mRNA loading capacity in LNPs to provide dose-sparing effects. Herein, we develop a metal ion mediated mRNA enrichment strategy to efficiently form a high-density mRNA core, and manganese ion (Mn) exhibits a unique capability to match the need. The prepared Mn-mRNA nanoparticle is subsequently coated with lipids to form the resulting nanosystem, L@Mn-mRNA, which achieved nearly twice the mRNA loading capacity compared to conventional mRNA vaccine formulations (LNP-mRNA). Remarkably, L@Mn-mRNA also demonstrates a 2-fold increase in cellular uptake efficiency compared to LNP-mRNA, attributed to the enhanced stiffness provided by the Mn-mRNA core. By combining improved mRNA loading with superior cellular uptake, L@Mn-mRNA achieves significantly enhanced antigen-specific immune responses and therapeutic efficacy as vaccines. We elucidate the mechanism behind Mn-mRNA construction and optimize the L@Mn-mRNA formulations, and this method is suitable for types of lipids and mRNAs. Moreover, L@Mn-mRNA also reduces the risk of anti-PEG IgG/IgM generation. Thus, this strategy holds significant potential as a platform for the next generation of lipid-based mRNA vaccines. 2+
Key numbers
2×
Increase in loading capacity
vs. conventional - formulations.
2×
Increase in cellular uptake efficiency
vs. -.
4.1×
Increase in antigen presentation
L@Mn-mOVA vs. -mOVA.
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mRNA Technology