Trace PEG-lipid engineering unlocks superior mRNA delivery via albumin-mediated liver targeting and enhanced endosomal escape

May 26, 2026Journal of controlled release : official journal of the Controlled Release Society

Improving mRNA delivery to the liver by using tiny PEG-lipid tweaks that help it bind to albumin and escape cell compartments

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Abstract

Replacing the conventional PEG-lipid in lipid nanoparticles with Pr-181-277 resulted in a 4.5-fold increase in luciferase mRNA expression in the liver.

A library of 45 novel PEG-lipids was created to improve mRNA delivery.
Pr-181-277, an engineered PEG-lipid, significantly enhanced hepatic mRNA delivery.
The replacement of standard PEG-lipid with Pr-181-277 improved Cre-mediated gene editing efficiency by 5.3-fold in the liver.
Mechanistic studies suggest that Pr-181-277 facilitates liver accumulation by forming a protein layer rich in albumin.
Pr-181-277's design also promotes membrane instability, aiding in the release of genetic material from endosomes.

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Lipid nanoparticles (LNPs) represent a leading non-viral platform for mRNA delivery, yet achieving efficient tissue-specific targeting and cytosolic release remains challenging. This study addresses this issue by engineering the structure of trace PEG-lipids-a minor but critical component of LNPs. A library of 45 novel PEG-lipids was constructed, and Pr-181-277-featuring an asymmetric linker-was identified as a potent enhancer of hepatic mRNA delivery. Replacing the conventional PEG-lipid in standard LNPs with Pr-181-277 led to a 4.5-fold increase in luciferase mRNA expression and a 5.3-fold improvement in Cre-mediated gene editing efficiency in the liver. Mechanistic studies reveal a synergistic two-step mechanism: 1) In vivo, Pr-181-277 drives the formation of a protein corona enriched with albumin, which could explain the observed liver accumulation. 2) Its structure concurrently enhances membrane instability, which facilitates rapid endosomal escape and cargo release. Our work demonstrates that minimal, rational redesign of the PEG-lipid structure can coordinately overcome both extracellular and intracellular barriers, providing a powerful and simple strategy to advance LNP-based therapeutics.

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Trace PEG-lipid engineering unlocks superior mRNA delivery via albumin-mediated liver targeting and enhanced endosomal escape

Abstract

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