Ionizable Cationic Lipids With Oxidation-Resistant Polyene Chains
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Solution Overview
Problem
Existing ionizable cationic lipids (ICLs) used in lipid nanoparticles (LNPs) for nucleic acid delivery are susceptible to oxidative degradation during storage, compromising their stability and transfection activity.
Innovation Solution
Engineering cationic lipids with polyene hydrocarbon chains separated by at least two methylene groups to enhance oxidative stability and maintain high transfection potency, incorporating specific lipid compositions like AKG-UO-1, AKG-UO-2, and AKG-UO-4, and optimizing LNP formulations with low phosphatidyl-L-serine content for enhanced dendritic cell targeting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ionizable cationic lipids with polyene chains are used in LNP formulations, then transfection activity is improved, but oxidative stability deteriorates
Solution Approach 1:
The patent divides the polyene chain into segments separated by methylene groups, transforming the continuous conjugated system into discrete olefin units. This segmentation breaks the oxidative degradation pathway while preserving the overall transfection function, directly resolving the contradiction between transfection activity and oxidative stability.
Solution Approach 2:
The patent introduces methylene spacer groups at specific locations within the polyene chain to create localized structural modifications. These local changes in the hydrocarbon chain architecture provide oxidation resistance at critical positions without compromising the global transfection capability of the lipid molecule.
2Strength
If polyene chains with conjugated double bonds are used, then membrane interaction is enhanced, but susceptibility to oxidation increases
Solution Approach 1:
The patent extracts the conjugated double bond system from the polyene chain, isolating individual olefin units separated by methylene groups. This extraction removes the vulnerable conjugated structure that drives oxidation while retaining the membrane-interacting properties through the preserved polyene architecture.
Solution Approach 2:
The patent converts the potentially harmful conjugated polyene structure into a beneficial segmented architecture. The methylene-separated olefin units maintain membrane interaction capabilities while the segmented structure inherently resists oxidation, transforming an oxidation-prone molecule into an oxidation-resistant one.
3Productivity
If conventional ICLs are used for nucleic acid delivery, then delivery efficiency is achieved, but storage stability deteriorates
Solution Approach 1:
The patent incorporates oxidation-resistant structural features into the lipid molecule during synthesis, before storage begins. The methylene-separated olefin architecture is built-in from the start, providing pre-established protection against oxidative degradation during storage while maintaining delivery efficiency when the LNP is administered.
Data Source
AI summary
The present disclosure provides for improved compositions of ionizable lipid nanoparticles for the delivery of therapeutic nucleic acids to cells. Cationic ionizable lipids are engineered with improved stability to oxidative degradation while in storage, while retaining high transfection activity or potency in cells. These lipids are designed to be biodegradable, thus improving the tolerability of nanoparticles formed with them in vivo. In addition, targeting of these nanoparticles in a highly specific manner to dendritic cells is provided for through inclusion of antibody conjugates directed against cell surface receptors.