ROS-Responsive RNA Coacervates for Oxidative Stress-Triggered Release

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Solution Overview

Problem

Existing RNA-based therapeutic delivery methods face challenges such as rapid degradation, inefficient cellular uptake, poor stability, and off-target effects, necessitating improved specificity and controlled release mechanisms.

Innovation Solution

Development of ROS-responsive RNA/spermine coacervates modified with DTSSP, which trigger controlled RNA release in response to elevated oxidative stress levels, utilizing spermine's modification with 3,3′-dithiobis(sulfosuccinimidyl propionate) to enhance specificity and targeted delivery.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional RNA delivery methods are used, then RNA molecules can be delivered to cells, but rapid degradation by enzymes occurs and stability during circulation is poor

Engineering Contradiction:

ImproveRNA stabilityVSAvoidcirculation time

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent uses complex coacervates formed by spermine and RNA as an intermediary delivery vehicle. The coacervate structure protects RNA from enzymatic degradation during circulation while maintaining stability, and enables controlled release at the target site through ROS-responsive mechanisms.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent modifies spermine with DTSSP to create ROS-responsive coacervates that change their structural parameters in response to reactive oxygen species. This parameter change enables the coacervates to transition from a stable encapsulated state during circulation to a released state at the target site with elevated ROS levels.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If conventional RNA delivery methods are used, then RNA can be transported into cells, but cellular uptake efficiency is poor

Engineering Contradiction:

Improvecellular uptake efficiencyVSAvoiddelivery effectiveness

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent creates composite coacervate structures combining spermine (a natural polycation) with RNA molecules. This composite material exhibits enhanced cellular uptake properties compared to naked RNA, while maintaining biocompatibility and controlled release capabilities through the polycation-polyanion complex structure.

Inventive Principle:

Principle #40Composite materials

3Reliability

If conventional RNA delivery methods are used, then RNA therapy can be administered, but off-target effects occur leading to unintended protein expression

Engineering Contradiction:

Improvetherapeutic specificityVSAvoidoff-target effects

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent exploits the harmful factor of elevated ROS levels at disease sites (such as tumors with high oxidative stress) and converts it into a beneficial trigger for controlled RNA release. The DTSSP-modified spermine coacervates remain stable in normal conditions but disassemble specifically in high-ROS environments, enabling targeted delivery and minimizing off-target effects.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 ROS-responsive coacervates provide precise RNA delivery to cells with heightened oxidative stress, minimizing off-target effects and enhancing therapeutic efficacy by ensuring RNA release only at targeted sites.

Implementation Method 1

modifying the polycationic component of RNA complex coacervates to induce stimuli-triggered structural changes that release RNA molecules in response to elevated oxidative stress

Methodology Applied

Scientific EffectOxidative stress-responsive cleavage: Oxidation

Implementation Method 2

Complex coacervation is a phase separation process driven by oppositely charged polyelectrolytes that spontaneously form dense liquid-liquid aggregates

Methodology Applied

Scientific EffectComplex coacervation: Coacervate

Implementation Method 3

These electrostatic interactions between spermine and RNA play a pivotal role in effectively encapsulating and safeguarding the RNA molecules during coacervation

Methodology Applied

Scientific EffectElectrostatic interaction: Electrostatics

Data Source

PatentUS20260061063A1RNA-based therapeutic delivery with oxidative stress-responsive coacervates

Publication Date: 2026.03.05 CLEMSON UNIVERSITY

AI summary

Disclosed herein are novel and advanced technique for the modification of complex coacervates to induce structural changes releasing ribonucleic acid (RNA)-based molecules in response to oxidative stress. This approach leverages the reactivity of reactive oxygen species (ROS) generated during oxidative stress to trigger structural changes in the modified cationic coacervate component that induces phase miscibility and subsequently releases RNA molecules from the coacervate matrix.