Polyion Complex mRNA Delivery via PEG-Block Copolymer Micelle
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Solution Overview
Problem
Current drug delivery systems face challenges in delivering mRNA into cells without inducing inflammation and ensuring uniform and sustained protein expression, particularly for treating diseases like fulminant hepatitis and dysosmia.
Innovation Solution
A polyion complex comprising a cationic polymer and mRNA, specifically a block copolymer of PEG and a polycation, forms a micelle structure that minimizes inflammatory reactions and enables efficient, uniform, and prolonged protein expression by encapsulating mRNA, allowing it to be delivered into cells without premature release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mRNA is delivered into cells using conventional drug delivery systems, then protein expression can be achieved, but inflammation is induced
Solution Approach 1:
The patent uses a polyion complex as an intermediary carrier between mRNA and cells. This complex, formed by cationic polymers and anionic polymers, mediates the delivery process by protecting mRNA from immune recognition while facilitating cellular uptake, thereby achieving protein expression without inducing inflammation
Solution Approach 2:
The patent modifies the physical and chemical parameters of mRNA delivery by forming a polyion complex. This changes the charge, size, and stability characteristics of the delivery system, allowing mRNA to be delivered without triggering inflammatory responses while maintaining efficient protein expression
2Object-affected harmful factors
If mRNA is delivered using polyion complexes, then inflammation is suppressed, but uniform and sustained protein expression must be ensured
Solution Approach 1:
The patent employs a composite polyion complex structure combining cationic and anionic polymers. This composite material provides both protective encapsulation of mRNA and controlled release properties, ensuring uniform and sustained protein expression while suppressing inflammation
Solution Approach 2:
The patent uses a nested structure where mRNA is encapsulated within the polyion complex core, which itself is covered by a PEG shell. This nested architecture protects mRNA, controls its release, and ensures sustained protein expression without inflammation
3Duration of action of moving object
If PEG covers the nanoparticle shell to increase biocompatibility, then blood residence time is enhanced, but mRNA delivery efficiency must be maintained
Solution Approach 1:
The patent applies local quality by having different regions of the polyion complex serve different functions: the inner core provides mRNA encapsulation and delivery efficiency, while the outer PEG shell provides biocompatibility and extended blood residence time
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 polyion complex effectively delivers mRNA encoding brain-derived neurotrophic factor or anti-apoptosis factors, achieving rapid and sustained protein expression in a wide range of cells, reducing inflammation and effectively treating diseases such as fulminant hepatitis and dysosmia.
Implementation Method 1
The present invention relates to a polyion complex of mRNA and a cationic polymer
Implementation Method 2
PEG covers the shell of the nanoparticle, which is known to be convenient in terms of increasing biocompatibility and enhancing blood residence time
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3C
AI summary
[Problem to be Solved] The invention provides a composition and a pharmaceutical composition for delivering mRNA. [Solution] A polyion complex comprising a polycationic polymer and a messenger RNA (mRNA).