One-Component Cationic Lipids for Systemic mRNA Delivery to Splenic T Cells

Area of Science:

• Biotechnology
• Immunology
• Drug Delivery

Background:

• Targeted delivery of messenger RNA (mRNA) is crucial for effective mRNA immunotherapy, particularly to specific splenic cell subsets.
• Current four-component lipid nanoparticles (LNPs) show limitations in targeting beyond hepatocytes and muscle tissue, necessitating simpler, non-liver mRNA delivery systems.
• Existing ionizable lipids in LNPs often rely on tertiary amines, prompting exploration of alternative lipid chemistries for enhanced delivery.

Purpose of the Study:

• To design and evaluate novel one-component ionizable cationic lipids for selective mRNA delivery to the spleen and T cells.
• To investigate the efficacy of these standalone cationic lipid carriers for in vitro and in vivo mRNA delivery.
• To explore the potential of these simplified vectors for advancing extrahepatic mRNA immunotherapy.

Main Methods:

• Rational design of one-component ionizable cationic lipids featuring secondary amines.
• In vitro and in vivo assessment of mRNA delivery efficiency using the developed cationic lipids.
• Evaluation of targeted delivery to splenic T cell subsets following intravenous administration.

Main Results:

• The developed one-component ionizable cationic lipids demonstrated efficient mRNA delivery both in vitro and in vivo.
• These standalone cationic lipid carriers successfully delivered mRNA to splenic T cell subsets after intravenous administration.
• The secondary amine-rich lipids proved effective as simplified, non-liver mRNA delivery vectors.

Conclusions:

• One-component ionizable cationic lipids offer a simplified and effective strategy for targeted extrahepatic mRNA delivery.
• These novel vectors show significant potential for advancing mRNA immunotherapy applications by enabling precise delivery to spleen and T cells.
• This approach expands the utility of ionizable lipids beyond traditional LNPs for precise mRNA therapeutics.