03/18/2026
Penn Engineers have redesigned lipid nanoparticles (LNPs) to potentially make mRNA vaccines more effective and better tolerated.
By modifying the chemistry of the ionizable lipid, a key LNP component, researchers boosted the metabolism of certain immune cells, improving their performance while reducing inflammation tied to common vaccine side effects like fever and fatigue.
“Instead of accepting a trade-off between efficacy and side effects, we’re beginning to see that chemistry can help us improve both," says Michael J. Mitchell, Associate Professor in Bioengineering (BE) and the study’s senior author.
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Penn Bioengineering