pH-Responsive Copolymer for Targeted Virus Release
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Solution Overview
Problem
Current pH-responsive vectors for controlled drug delivery face challenges in accurately targeting and releasing viruses due to non-specific binding and low internalization efficiency, particularly in acidic environments, which affects their immunogenicity and transgene efficiency.
Innovation Solution
A copolymer with a chemical formula that undergoes charge reversal and size oscillation in response to pH changes, specifically using a negatively charged complex composed of polyethyleneimine particles and a copolymer with aliphatic or aromatic compounds, allowing for controlled release of viruses in acidic regions and reformation in neutral conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If polymer coating is used to increase plasma circulation kinetics and passive targeting, then circulation time is improved, but viral internalization efficiency deteriorates due to hidden receptors
Solution Approach 1:
The polymer coating is designed to dynamically change its charge properties in response to pH changes. At physiological pH (7.4), the coating maintains a negative charge for stable circulation. In acidic environments (pH < 6.5), the coating undergoes charge reversal to positive, enabling viral internalization through electrostatic interaction with negatively charged cell membranes, thus resolving the contradiction between circulation stability and internalization efficiency
Solution Approach 2:
The invention utilizes pH-dependent parameter changes in the copolymer coating. The coating transitions from a negatively charged state at pH 7.4 to a positively charged state at pH < 6.5, allowing the same coating to provide both prolonged circulation and enhanced internalization under different physiological conditions, eliminating the need for separate coating designs
2Manufacturing precision
If pH-responsive vectors are used for controlled drug delivery, then targeted release is improved, but non-specific binding increases leading to reduced accuracy
Solution Approach 1:
The invention inverts the conventional approach by designing a coating that is negatively charged at physiological pH (reducing non-specific binding) and becomes positively charged in acidic environments (enhancing targeted release). This reversal of charge behavior allows the vector to avoid non-specific binding during circulation while achieving accurate targeted release at the disease site
Solution Approach 2:
The pH-responsive copolymer coating acts as an intermediary that mediates between the viral payload and the biological environment. It provides a protective barrier during circulation that prevents non-specific binding, while simultaneously enabling specific interaction with target cells in acidic environments, thus resolving the contradiction between targeted release and non-specific binding
3Duration of action of stationary object
If polymeric scaffolds are used for localized delivery, then gene expression duration is extended, but transgene efficiency decreases compared to viral vectors
Solution Approach 1:
The invention merges the advantages of both viral and polymeric delivery systems by combining viral vectors (high transgene efficiency) with pH-responsive polymeric coatings (prolonged circulation and localized delivery). The resulting hybrid system maintains the high transduction capability of viral vectors while adding the sustained delivery and localized targeting capabilities of polymeric scaffolds, thus resolving the contradiction between transgene efficiency and expression duration
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-dependent copolymer system effectively releases viruses in acidic environments, such as tumors, while maintaining low cytotoxicity and high transduction efficiency, enabling localized and targeted gene delivery with enhanced transformation efficiency.
Implementation Method 1
The copolymer undergoes charge reversal and size oscillation in response to pH changes, specifically using a negatively charged complex composed of polyethyleneimine particles and a copolymer with aliphatic or aromatic compounds, allowing for controlled release of viruses in acidic regions and reformation in neutral conditions
Implementation Method 2
The copolymer undergoes charge reversal and size oscillation in response to pH changes, specifically using a negatively charged complex composed of polyethyleneimine particles and a copolymer with aliphatic or aromatic compounds, allowing for controlled release of viruses in acidic regions and reformation in neutral conditions
Data Source
AI summary
A method for releasing viruses includes the steps of: preparing a first negatively charged complex, comprising a plurality of viruses, a plurality of polyethyleneimine particles, and a copolymer; transferring the complex to an acidic region, thereby transforming the complex into a positively charged complex to release a portion of the viruses in the acidic region; and transferring the complex to a non-acidic region, thereby transforming the positively charged complex into a negatively charged complex. One embodiment of the copolymer has the following chemical formula:wherein R1 represents aliphatic compounds or aromatic compounds, and R2 includes at least one negatively charged group.