PEG-PEI Gene Carrier Cytotoxicity Reduction

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Solution Overview

Problem

Conventional gene carriers, such as those based on polyethyleneimine, face challenges in achieving high gene transfer efficiency while minimizing cytotoxicity and maintaining stability in external environments.

Innovation Solution

A gene carrier composed of polyethylene glycol (PEG) and polyethyleneimine (PEI) is developed, where PEG is conjugated with linear PEI to form a polymer-gene complex, optimizing molecular weights and arm configurations to enhance gene transfer efficiency and reduce cytotoxicity, with a focus on forming complexes suitable for cellular penetration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If polyethyleneimine (PEI) is used as a gene carrier, then gene transfer efficiency is improved, but cytotoxicity increases

Engineering Contradiction:

Improvegene transfer efficiencyVSAvoidcytotoxicity

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent creates a composite gene carrier by conjugating polyethyleneimine (PEI) with polyethylene glycol (PEG). This composite structure combines the gene transfer efficiency of PEI with the low cytotoxicity and biocompatibility of PEG, resolving the contradiction between effective gene delivery and cellular safety

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention applies local quality modification by attaching PEG chains to specific locations on the PEI structure. The PEI core maintains its gene-binding and transfection capabilities while the PEG peripheral groups provide steric protection and reduce cytotoxic effects, creating different functional zones within the same molecule

Inventive Principle:

Principle #3Local quality

2Productivity

If conventional gene carriers are used, then gene delivery is achieved, but stability in external environment is insufficient

Engineering Contradiction:

Improvegene delivery efficiencyVSAvoidstability in external environment

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent modifies the physical and chemical parameters of the gene carrier by controlling the molecular weight of PEI (1-10 kDa), the degree of PEG conjugation, and the structural architecture. These parameter optimizations enhance both the stability of the carrier in external environments and its effectiveness in gene delivery

Inventive Principle:

Principle #35Parameter changes

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 PEG-PEI complex demonstrates improved gene transfer efficiency, low cytotoxicity, and stability, forming particles around 200 nm in size that effectively protect genes from external environments and promote high transfection rates with minimal cellular toxicity.

Implementation Method 1

polyethyleneimine (PEI) is recognized to have highly efficient gene delivery

Methodology Applied

Scientific EffectElectrostatic interaction: Electrostatics

Implementation Method 2

an arm-type polyethyleneglycol is conjugated with linear polyethyleneimine

Methodology Applied

Scientific EffectConjugation: Chemical Bonding

Data Source

PatentUS9115057B2Conjugate of arm-type polyethyleneglycol with linear polyethyleneimine as gene carrier and synthesis thereof

Publication Date: 2015.08.25 POSTECH ACADEMY INDUSTRY FOUNDATION

AI summary

Disclosed are a gene carrier in which polyethyleneglycol is conjugated with polyethyleneimine and a method for the synthesis thereof. The gene carrier is useful in transferring DNA, siRNA and negatively charged peptides.