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Related Concept Videos

Microorganisms in Medicine and Therapeutics01:29

Microorganisms in Medicine and Therapeutics

Microorganisms play a fundamental role in vaccine development, gene therapy, and therapeutic production. Their biological properties are harnessed to advance medicine and public health. Beyond immunization, microorganisms contribute to gut health, antibiotic synthesis, and genetic disease treatment.Live Attenuated and Inactivated VaccinesLive attenuated vaccines, such as the measles, mumps, and rubella (MMR) vaccine, utilize weakened forms of pathogens to closely resemble natural infections.
Vaccines01:21

Vaccines

Vaccines are among the most effective tools in preventive medicine, designed to prepare the immune system to recognize and combat infectious agents. By introducing antigens—substances that the immune system identifies as foreign—vaccines stimulate an adaptive immune response that leads to immunological memory. This immunological memory enables the body to mount a faster and more effective response upon future exposures to the actual pathogen.Vaccines can be categorized based on the type of...

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Formulating and Characterizing Lipid Nanoparticles for Gene Delivery using a Microfluidic Mixing Platform
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Modulating Immunogenicity and Reactogenicity in mRNA-Lipid Nanoparticle Vaccines through Lipid Component

Yoshino Kawaguchi1,2, Mari Kimura1,3, Tatsuya Karaki1,3

  • 1Vaccine Creation Group, BIKEN Innovative Vaccine Research Alliance Laboratories, Research Institute for Microbial Diseases, The University of Osaka, 3-1 Yamadaoka, Suita, Osaka 565-0871, Japan.

ACS Nano
|July 23, 2025
PubMed
Summary

Modifying lipid nanoparticle (LNP) components in mRNA vaccines, like PEG-lipids and phospholipids, can enhance immune responses while reducing side effects such as fever. This optimization improves vaccine efficacy and tolerability.

Keywords:
PEG-lipidscholesterollipid nanoparticlemRNA vaccinephospholipids

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Area of Science:

  • Vaccinology
  • Nanotechnology
  • Immunology

Background:

  • Messenger RNA (mRNA) vaccines are effective but can cause adverse reactions like fatigue and fever.
  • Lipid nanoparticle (LNP) formulation optimization is key to modulating mRNA vaccine immunogenicity and reactogenicity.
  • Modifying ionizable lipids in LNPs is common, but the impact of other components is less understood.

Purpose of the Study:

  • To investigate the effects of altering poly(ethylene glycol) (PEG)-lipids, cholesterol, and phospholipids in mRNA-LNPs.
  • To assess the impact of these modifications on protein expression, immune responses, and adverse reactions.
  • To identify strategies for optimizing mRNA vaccine immunogenicity and reactogenicity.

Main Methods:

  • Prepared mRNA-LNP formulations with varied PEG-lipid structures/ratios, cholesterol substitutions (plant sterols), and phospholipid modifications.
  • Evaluated in vivo protein expression, antigen-specific antibody and CD8+ T cell responses.
  • Assessed inflammatory cytokine production and adverse reactions (e.g., fever).

Main Results:

  • Reduced PEG chain length and molar ratio enhanced antigen-specific antibody and CD8+ T cell responses.
  • Cholesterol and phospholipid modifications yielded comparable immune responses to controls.
  • These modifications significantly reduced inflammatory cytokine production and adverse reactions.
  • Positive correlation found between organ protein expression and immune response/adverse reaction magnitude.

Conclusions:

  • Modifying PEG-lipids, cholesterol, and phospholipids in LNPs offers a viable strategy to balance mRNA vaccine immunogenicity and reactogenicity.
  • Optimized LNP formulations can potentially improve vaccine efficacy and patient tolerability.
  • Understanding LNP component impact is crucial for developing safer and more effective mRNA vaccines.