pH-Responsive Polymer-Caged Liposomes for Stable Drug Delivery
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Solution Overview
Problem
Liposome-based drug delivery systems face instability and lack of tunable triggers for controlled drug release, limiting their effectiveness in delivering nucleic acids, peptides, and drugs to specific locations within the body.
Innovation Solution
Development of pH-responsive, polymer-caged liposomes that incorporate a membrane-anchoring group, crosslinkable polymer, and bifunctional crosslinking molecule, allowing for stable delivery and controlled release of payloads at specific pH levels, enhancing stability and targeting capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liposomes are used for drug delivery, then delivery capability is achieved, but stability is poor
Solution Approach 1:
The patent applies composite materials by combining liposomes with polymer coatings (such as PEG, polyvinyl alcohol, or dextran) to create hybrid structures that possess both the delivery capability of liposomes and the stability enhancement from polymers. This composite approach resolves the contradiction by integrating the advantages of both material systems while mitigating their individual weaknesses.
2Reliability
If polymer coatings are added to liposomes to enhance stability, then stability improves, but the polymers can easily dissociate and return to unstable state
Solution Approach 1:
The patent employs preliminary action by pre-conjugating polymers to liposome surfaces during the formulation process, creating a stable attached state before administration. This preliminary modification ensures that the polymers remain attached under physiological conditions, preventing dissociation and maintaining stability throughout the delivery process.
3Reliability
If crosslinked liposomes are created to improve stability, then stability increases, but controllable release of payload is prevented
Solution Approach 1:
The patent applies parameter changes by using pH-responsive polymers that undergo conformational or structural changes in response to pH variations. This allows the liposome to maintain stability at physiological pH while enabling controlled release in acidic environments (such as tumors or endosomes), thus resolving the contradiction between stability and controlled release capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The pH-responsive polymer-caged liposomes provide long-term stability and controlled release of therapeutic payloads, improving delivery efficiency and efficacy, particularly in acidic environments, while maintaining structural integrity and reducing leakage in biological sera.
Implementation Method 1
comprising a pH-responsive delivery mechanism for delivery of nucleic acids, peptides, small molecules, drugs, etc.
Data Source
AI summary
The present invention provides liposomal compositions and methods of using such compositions in vitro and in vivo. In particular, the present invention provides stable, polymer-caged liposomes comprising a pH responsive delivery mechanism for delivery of nucleic acids, peptides, small molecules, drugs, etc. in vitro and in vivo.