Screening for lipid nanoparticles that modulate the immune activity of helper T cells towards enhanced antitumour activity

Nat Biomed Eng. 2024 May;8(5):544-560. doi: 10.1038/s41551-023-01131-0. Epub 2023 Dec 11.

Abstract

Lipid nanoparticles (LNPs) can be designed to potentiate cancer immunotherapy by promoting their uptake by antigen-presenting cells, stimulating the maturation of these cells and modulating the activity of adjuvants. Here we report an LNP-screening method for the optimization of the type of helper lipid and of lipid-component ratios to enhance the delivery of tumour-antigen-encoding mRNA to dendritic cells and their immune-activation profile towards enhanced antitumour activity. The method involves screening for LNPs that enhance the maturation of bone-marrow-derived dendritic cells and antigen presentation in vitro, followed by assessing immune activation and tumour-growth suppression in a mouse model of melanoma after subcutaneous or intramuscular delivery of the LNPs. We found that the most potent antitumour activity, especially when combined with immune checkpoint inhibitors, resulted from a coordinated attack by T cells and NK cells, triggered by LNPs that elicited strong immune activity in both type-1 and type-2 T helper cells. Our findings highlight the importance of optimizing the LNP composition of mRNA-based cancer vaccines to tailor antigen-specific immune-activation profiles.

MeSH terms

  • Animals
  • Antigens, Neoplasm / immunology
  • Cancer Vaccines / administration & dosage
  • Cancer Vaccines / immunology
  • Dendritic Cells* / drug effects
  • Dendritic Cells* / immunology
  • Female
  • Immunotherapy / methods
  • Lipids / chemistry
  • Liposomes
  • Melanoma, Experimental / drug therapy
  • Melanoma, Experimental / immunology
  • Melanoma, Experimental / therapy
  • Mice
  • Mice, Inbred C57BL*
  • Nanoparticles* / chemistry
  • RNA, Messenger / genetics
  • RNA, Messenger / metabolism
  • T-Lymphocytes, Helper-Inducer* / drug effects
  • T-Lymphocytes, Helper-Inducer* / immunology

Substances

  • Lipids
  • Cancer Vaccines
  • Lipid Nanoparticles
  • Antigens, Neoplasm
  • RNA, Messenger
  • Liposomes