Zwitterionic Polymer Coatings for Gene Delivery Stability
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Solution Overview
Problem
Current gene delivery systems face challenges such as low transfection efficiency, high toxicity, and short circulating half-life of therapeutic agents like proteins and peptides, due to rapid degradation and immune response, which limits their effectiveness in treating genetic disorders.
Innovation Solution
Development of biocompatible polymers with zwitterionic repeating units that can be converted to zwitterionic moieties, used to create nanoparticles for conjugating with peptides, proteins, and nucleic acids, enhancing stability and reducing immune response, while maintaining activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If PEGylation is used to improve pharmacokinetics and shield proteins from proteolytic enzymes, then molecular mass increases and stability improves, but preexisting anti-PEG antibodies lead to fast clearance and PEG reduces the activity of the conjugated protein
Solution Approach 1:
The patent changes the chemical parameter of the polymer coating from PEG (polyethylene glycol) to poly(sialic acid) to alter the interaction profile with the immune system. This parameter change eliminates anti-PEG antibody recognition while maintaining the protective shielding function, thereby resolving the contradiction between stability improvement and immune-mediated clearance.
Solution Approach 2:
The patent creates a composite structure by coating viral particles with poly(sialic acid) polymer chains. This composite material combines the protective function of PEGylation with the immunomodulatory properties of sialic acid, which is naturally present on cell surfaces and can inhibit complement activation and immune recognition, thus avoiding anti-PEG antibody issues while maintaining stability.
2Object-affected harmful factors
If natural materials like chitosan are used as gene delivery carriers to improve biocompatibility, then biocompatibility increases, but transfection efficiency and solubility remain unsatisfactory
Solution Approach 1:
The patent creates a composite gene delivery system by combining poly(sialic acid) polymer with viral vectors or other delivery vehicles. This composite approach leverages the biocompatibility and immune evasion properties of poly(sialic acid) while incorporating the transfection capability of viral vectors, thereby achieving both high biocompatibility and high transfection efficiency simultaneously.
Solution Approach 2:
The patent applies poly(sialic acid) coating selectively to specific regions or surfaces of the gene delivery vehicle, creating local zones of enhanced biocompatibility and immune protection while preserving the functional regions needed for transfection. This localized application allows optimization of different properties in different areas of the delivery system.
3Strength
If peptide vectors are used to improve biodegradability and reduce cytotoxicity, then biodegradability and compatibility increase, but gene transfection efficiency, loading efficiency, and blood circulation remain poor
Solution Approach 1:
The patent creates a composite structure by conjugating peptide vectors with poly(sialic acid) polymer chains. This composite combines the biodegradability and low cytotoxicity of peptide vectors with the extended circulation time and enhanced transfection efficiency provided by the poly(sialic acid) coating, thereby achieving all desired properties simultaneously.
Solution Approach 2:
The poly(sialic acid) coating serves multiple functions: it extends blood circulation half-life by reducing renal clearance, enhances transfection efficiency by improving cellular uptake, and maintains biodegradability through its natural metabolic pathways. This multi-functional coating resolves the contradictions between different performance requirements.
Data Source
AI summary
Provided herein are biocompatible polymers having a polymer backbone and one or more repeating units, and methods of making and using the same. The repeating units can each be individually selected from a zwitterionic precursor repeating unit of Formula (1). Also provided are systems for nucleic acid delivery including the biocompatible polymers, the systems having a cationic core and a polysaccharide-anionic peptide conjugate adsorbed to the cationic core.