Low MW PEG Polycationic Nanoparticles for Gene Delivery
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Solution Overview
Problem
Current non-viral gene delivery systems, such as nanoparticles, face challenges with low transfection efficiency in vivo due to rapid aggregation and clearance by the mononuclear phagocytic system, and PEGylation, while improving stability, reduces cell interaction and transgene expression.
Innovation Solution
Development of polymeric micellar nanoparticles composed of a block or graft copolymer with a polycationic polymer and polyethylene glycol (PEG) of less than 1 kDa molecular weight, allowing for shaped micellar structures that are stable in biological media and enhanced transfection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If PEGylation is used to improve stability in biological media, then stability is improved, but cell interaction and transgene expression are reduced
Solution Approach 1:
The patent changes the molecular weight parameter of PEG from conventional high values (2kDa, 5kDa, 20kDa) to low values (200 Da, 500 Da, 750 Da). This parameter change allows the PEGylated nanoparticles to maintain both stability in biological media and effective cell interaction, resolving the contradiction between stability and transgene expression
Solution Approach 2:
The patent uses composite block copolymers comprising both PEG and polycationic polymer segments. This composite structure allows the PEG portion to provide stability in biological media while the polycationic portion maintains cell interaction capability and transfection efficiency, thus resolving the contradiction between stability and transgene expression
2Reliability
If cationic polymers are used to condense plasmid DNA into nanoparticles, then transfection efficiency is improved in vitro, but aggregation and clearance by mononuclear phagocytic system occur in vivo
Solution Approach 1:
The patent employs block copolymers that combine PEG segments with polycationic polymer segments. The PEG segments provide steric stabilization and reduce recognition by the mononuclear phagocytic system, preventing aggregation and clearance in vivo, while the polycationic segments maintain DNA condensation and transfection efficiency
Solution Approach 2:
The patent creates nanoparticles with heterogeneous surface properties through block copolymer composition. The PEG segments localized on the nanoparticle surface provide anti-aggregation and anti-clearance properties, while the polycationic segments localized in the core or at the interface maintain DNA binding and cellular uptake functionality
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 nanoparticles exhibit significantly higher transfection efficiency, up to 100-fold greater than those with PEG of higher molecular weight, while maintaining stability and avoiding toxicity, enabling effective gene delivery to target cells.
Implementation Method 1
a block or graft copolymer comprising at least one polycationic polymer and at least one polyethylene glycol (PEG) polymer having an average molecular weight less than 1 kDa; and at least one nucleic acid; wherein the graft or block copolymer and the at least one nucleic acid are complexed and condensed into a shaped micellar nanoparticle that is stable in biological media
Implementation Method 2
Cationic polymers are commonly used to condense plasmid DNA into nanoparticles through electrostatic interactions
Data Source
AI summary
Compositions comprising a polymeric micellar nanoparticle composition comprising a block or graft copolymer comprising at least one polycationic polymer and at least one polyethylene glycol (PEG) polymer having an average molecular weight less than 1 kDa, and at least one nucleic acid, wherein the graft or block copolymer and at least one nucleic acid are complexed and condensed into a shaped micellar nanoparticle that is stable in biological media are disclosed. The presently disclosed subject matter also provides a method for preparing the presently disclosed polymeric micellar nanoparticle compositions, a method for targeting at least one metastatic cancer cell in a subject, and a method for treating a disease or condition using the presently disclosed polymeric micellar nanoparticle compositions.