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Related Concept Videos

Phosphoinositides and PIPs01:42

Phosphoinositides and PIPs

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Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
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Lipids as Anchors01:32

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In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
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Formulating and Characterizing Lipid Nanoparticles for Gene Delivery using a Microfluidic Mixing Platform
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The PEG Dilemma in Lipid Nanoparticles.

Minglong Chen1, Shiyong Liu1

  • 1State Key Laboratory of Precision and Intelligent Chemistry, Department of Polymer Science and Engineering, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui, China.

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|March 19, 2026
PubMed
Summary

Poly(ethylene glycol) lipids (PEG-lipids) are crucial for mRNA nanoparticle stability. Reframing PEG challenges as surface engineering with defined interfaces can improve predictability and manufacturing for repeat-dose mRNA therapeutics.

Keywords:
PEG alternativesPEG‐lipidsimmunogenicitylipid nanoparticlesmRNA delivery

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Immunology

Background:

  • Poly(ethylene glycol) lipids (PEG-lipids) are essential for stabilizing mRNA lipid nanoparticles.
  • Repeat dosing of PEG-lipid nanoparticles can lead to immune responses and delivery challenges due to undefined nano-bio interfaces.

Purpose of the Study:

  • To reframe the challenges associated with PEG-lipids not as a material choice, but as a surface-engineering problem.
  • To explore strategies for improving the molecular definition of PEG interfaces in lipid nanoparticles.
  • To discuss implications for repeat-dosing mRNA therapeutics and clinical translation.

Main Methods:

  • Review and summarization of PEG-centric design parameters (chain length, terminal chemistry, PEG fraction, mixed-length designs).
  • Discussion of recent progress in PEG alternatives and translational constraints.
  • Exploration of strategies for enhanced molecular definition, including discrete-molar-mass PEG-lipids and topology control.

Main Results:

  • Reframing PEG challenges as a surface-engineering problem allows for optimization via measurable interfacial variables.
  • Increased molecular definition of PEG interfaces can narrow epitope heterogeneity and clarify structure-function relationships.
  • Improved molecular definition enhances predictability, manufacturing reproducibility, and the design space for repeat-dosing mRNA therapeutics.

Conclusions:

  • Enhanced molecular definition of PEG interfaces is key to overcoming limitations in current mRNA nanoparticle technology.
  • Strategies like discrete-molar-mass PEG-lipids and topology control can mitigate PEG-directed immunity.
  • Pairing interface design with immune-aware dosing and monitoring is crucial for durable clinical efficacy and safety of mRNA therapeutics.