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Researchers developed a peptide-encoded organ-selective targeting (POST) method for delivering messenger RNA (mRNA) to organs outside the liver. This novel LNP engineering approach enhances extrahepatic mRNA delivery for potential gene therapies.

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Area of Science:

  • Biotechnology
  • Nanomedicine
  • Molecular Biology

Background:

  • Messenger RNA (mRNA) therapeutics hold significant promise for gene and protein replacement therapies.
  • Current methods for mRNA delivery using lipid nanoparticles (LNPs) are effective for liver targeting but limited for other organs.
  • Efficient extrahepatic organ-selective delivery of mRNA remains a critical challenge for broader therapeutic applications.

Purpose of the Study:

  • To develop a novel method for achieving organ-selective mRNA delivery to extrahepatic organs following systemic administration.
  • To engineer lipid nanoparticles (LNPs) with enhanced targeting capabilities for non-hepatic tissues.
  • To establish a versatile platform for directing mRNA tropism to specific organs beyond the liver.

Main Methods:

  • Introduced a peptide-encoded organ-selective targeting (POST) method involving modular tuning of LNPs via surface engineering with specific amino acid sequences (POST codes).
  • Utilized molecular dynamics simulations to optimize peptide-protein binding affinities for specific plasma protein corona formation.
  • Conducted in vitro and in vivo testing to validate the organ-selective targeting efficacy of POST-modified LNPs.

Main Results:

  • Demonstrated that POST enables organ-selective delivery of mRNA to extrahepatic organs after systemic administration.
  • Showcased that targeting specificity arises from the unique protein corona formed on peptide-decorated LNPs, influenced by peptide sequence and plasma protein interactions.
  • Confirmed the applicability of the POST platform for delivering various ribonucleic acids and gene editing tools.

Conclusions:

  • The POST platform provides a modular approach for LNP surface engineering to achieve precise organ tropism.
  • This method significantly broadens the scope and versatility of organ-selective mRNA delivery for therapeutic applications.
  • POST technology represents a key advancement in overcoming limitations of extrahepatic mRNA delivery.