Polymer-Coated Nanoparticles for Reduced Cytotoxicity

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Solution Overview

Problem

Nanoparticle-based drug delivery systems face challenges such as immune reactions, rapid elimination by the mononuclear phagocyte system, and toxicity due to high positive charge, which affects systemic circulation and tissue distribution.

Innovation Solution

A polymer-coated nanoparticle comprising a cationic core and a polymer coating with a block copolymer structure, including a polyanionic segment and a neutral segment, which reduces the positive charge and cytotoxicity of the nanoparticles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a cationic nanoparticle is used to bind negatively charged payloads, then the binding efficiency is improved, but the cytotoxicity increases and immune reactions are triggered

Engineering Contradiction:

Improvepayload binding efficiencyVSAvoidcytotoxicity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The coating polymer is divided into distinct functional segments: a polyanionic segment for binding to the cationic core and a neutral segment for providing biocompatibility. This segmentation allows each segment to perform its specific function independently, resolving the contradiction between maintaining positive charge for payload binding and reducing cytotoxicity through neutral surface properties

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The nanoparticle employs a composite structure with a cationic core and a block copolymer coating. This composite material approach combines the advantages of charged materials (for payload binding) with neutral materials (for reduced toxicity), allowing the system to simultaneously achieve high payload binding efficiency and low cytotoxicity

Inventive Principle:

Principle #40Composite materials

2Reliability

If a cationic nanoparticle is used for payload delivery, then the payload condensation is improved, but the systemic circulation is reduced due to rapid immune elimination

Engineering Contradiction:

Improvepayload condensationVSAvoidsystemic circulation time

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The block copolymer coating acts as an intermediary layer between the cationic core and the biological environment. It mediates the interaction by providing a neutral surface that prevents direct contact between the charged core and immune cells, thereby extending systemic circulation time while preserving the core's payload condensation capability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The coating changes the surface charge parameter of the nanoparticle from highly positive to near-neutral, while the core maintains its positive charge for payload condensation. This parameter differentiation allows the nanoparticle to achieve both effective payload condensation and extended circulation by preventing immune recognition

Inventive Principle:

Principle #35Parameter changes

3Reliability

If a high positive charge is used on the nanoparticle, then the payload binding is improved, but the aggregation and cell lysis occur

Engineering Contradiction:

Improvepayload bindingVSAvoidaggregation and cell lysis

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The nanoparticle exhibits local quality differentiation: the core region maintains high positive charge density for effective payload binding, while the surface region presents neutral properties to prevent aggregation and cell lysis. This spatial differentiation of charge properties resolves the contradiction between strong payload binding and reduced harmful interactions

Inventive Principle:

Principle #3Local quality

4Reliability

If a cationic nanoparticle is administered locally, then the local delivery is achieved, but the tissue distribution is hampered by negative extracellular matrix

Engineering Contradiction:

Improvelocal deliveryVSAvoidtissue distribution

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The nanoparticle's surface charge is dynamically adjusted through the coating to be near-neutral, which allows it to adapt to different tissue environments. This dynamic charge presentation enables the nanoparticle to maintain local delivery capability while improving tissue distribution by reducing electrostatic repulsion from negatively charged extracellular matrices

Inventive Principle:

Principle #15Dynamics

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 polymer-coated nanoparticles exhibit a more uniform size distribution, reduced zeta potential, and decreased toxicity, leading to improved systemic circulation and tissue distribution, making them suitable for medical applications such as drug and gene delivery.

Implementation Method 1

The polymer coating can advantageously lower the positive charge of the cationic core

Methodology Applied

Scientific EffectElectrostatic interaction: Electrostatics

Implementation Method 2

The polymer coating comprises a block copolymer comprising a polyanionic segment and a neutral segment

Methodology Applied

Scientific EffectPhysical barrier/protection: Physical Containment

Data Source

PatentUS20250195442A1Polymer-coated nanoparticles

Publication Date: 2025.06.19 20MED THERAPEUTICS

AI summary

The invention is in the field of nanoparticles. In particular, the invention relates to a polymer-coated nanoparticle comprising a biologically active payload. The invention further relates to a method to prepare the polymer-coated nanoparticle. The polymer-coated nanoparticles may be used as a medicament, preferably as a vaccine, such as a prophylactic and/or a therapeutic vaccine.