Negatively Charged PEG-Lipid Conjugates for Stable Nucleic Acid LNPs
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Solution Overview
Problem
Existing PEG-lipids used in nanoparticle delivery systems are susceptible to hydrolysis under acidic or basic conditions, leading to instability and leakage of bioactive agents, which compromises the integrity of lipid particles and reduces their shelf-life.
Innovation Solution
Development of novel PEG-conjugated lipids with anionic precursor groups, which are incorporated into lipid-nucleic acid particles (LNPs) to enhance stability and facilitate intramuscular delivery of nucleic acids, such as mRNA, by using specific chemical structures and molecular weights of polyethylene glycol chains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional PEG-lipids are used in nanoparticle delivery systems, then the delivery function is achieved, but the lipid particles undergo hydrolysis under acidic or basic conditions leading to instability and leakage
Solution Approach 1:
The patent modifies the chemical structure of PEG-lipids by changing the head group parameters - specifically using anionic precursor groups (carboxylic acid, carboxlate, phosphate, or sulfate groups) instead of conventional neutral phospholipid head groups. This structural parameter change renders the lipid resistant to hydrolysis under acidic or basic conditions while maintaining delivery functionality.
Solution Approach 2:
The invention creates a composite lipid structure combining PEG chains with anionic precursor groups and fatty acyl chains. This composite structure integrates the stability benefits of anionic groups with the delivery capabilities of PEG-conjugated lipids, forming a hybrid molecule that resists hydrolysis while maintaining nanoparticle formation and cargo delivery functions.
2Productivity
If PEG-lipids are used for nucleic acid delivery, then delivery efficiency is improved, but hydrolysis leads to loss of PEG-phospholipid and negation of benefits
Solution Approach 1:
The patent applies preliminary anti-action by incorporating anionic precursor groups that proactively prevent hydrolysis before it can occur. The anionic groups (carboxylic acid, carboxlate, phosphate, or sulfate) are inherently resistant to acid-base catalyzed hydrolysis, creating a protective effect that prevents the degradation pathway from initiating in the first place.
3Ease of operation
If conventional PEG-lipids are used, then initial delivery function is achieved, but hydrolysis products dissociate from bilayer structure causing leakage
Solution Approach 1:
The invention changes the chemical parameters of the lipid head group by substituting conventional phospholipid head groups with anionic precursor groups. This parameter change fundamentally alters the chemical stability profile, preventing hydrolysis that would otherwise cause dissociation of hydrolysis products from the bilayer structure and subsequent particle leakage.
Data Source
AI summary
The invention provides PEG-conjugated lipids of formula (I): A-B-C (I) wherein A, B, and C have any of the values defined in the specification, as well as compositions comprising the PEG-conjugated lipids of formula (I), nucleic acid lipid nanoparticles comprising the PEG-conjugated lipids of formula (I), and methods of using the PEG-conjugated lipids of formula (I), the compositions, and the nucleic acid nanoparticles.