Fluorescent Polymer Dot-siRNA Nanoplatform for Stable Gene Silencing

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Solution Overview

Problem

Conventional methods for inhibiting gene expression in eukaryotic cells face challenges in achieving high specificity, reducing toxicity, ensuring ease of use, and effective delivery of siRNA due to poor stability and enzymatic degradation, which diminishes therapeutic effectiveness.

Innovation Solution

A multi-functional near-infrared fluorescent polymer dot (Pdot)-siRNA nanoplatform is introduced, leveraging positively charged Pdots for electrostatic binding with siRNA, enhancing stability and enabling dual fluorescence emission for real-time visualization and efficient delivery.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional siRNA delivery methods are used, then gene expression inhibition can be achieved, but delivery efficiency is poor due to enzymatic degradation and instability

Engineering Contradiction:

ImprovesiRNA stabilityVSAvoiddelivery efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent introduces polymer dots as an intermediary carrier that protects siRNA from enzymatic degradation. The polymer dots bind to siRNA through electrostatic interactions, forming a protected complex that enhances siRNA stability in cellular environments while maintaining delivery efficiency to target cells.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite nanoplatform combining polymer dots with siRNA. This composite structure leverages the protective and delivery capabilities of polymer dots while providing the gene silencing function of siRNA, achieving both improved stability and efficient delivery simultaneously.

Inventive Principle:

Principle #40Composite materials

2Reliability

If conventional gene inhibition methods are used, then therapeutic effects can be achieved, but toxicity increases and specificity decreases

Engineering Contradiction:

Improvetherapeutic effectivenessVSAvoidtoxicity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by designing polymer dots with specific surface properties and charges that enable selective binding to siRNA and targeted delivery to specific cell types. This localized approach ensures therapeutic effects are achieved only where needed, reducing off-target toxicity while maintaining effectiveness.

Inventive Principle:

Principle #3Local quality

3Difficulty of detecting and measuring

If visualization mechanisms are added to delivery systems, then delivery monitoring is improved, but device complexity increases

Engineering Contradiction:

Improvedelivery monitoringVSAvoidsystem complexity

Core Design Contradiction:

Difficulty of detecting and measuringVSDevice complexity

Solution Approach 1:

The patent makes the polymer dot multi-functional by incorporating both delivery capabilities (binding siRNA, cellular uptake) and visualization functions (fluorescence emission) into a single nanoplatform. This eliminates the need for separate visualization systems, reducing overall complexity while enabling real-time delivery monitoring.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent utilizes fluorescence emission from polymer dots as a color/light signal to visualize and monitor siRNA delivery in real-time. The fluorescent property of polymer dots provides a clear visual indicator of successful delivery without requiring additional complex detection systems.

Inventive Principle:

Principle #32Color 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 Pdot-siRNA nanoplatform provides minimal toxicity, efficient inhibition of target gene expression, and extended persistence in cells, offering a flexible and low-toxicity solution for therapeutic applications and bioimaging.

Implementation Method 1

leveraging positively charged Pdots for electrostatic binding with siRNA

Methodology Applied

Scientific EffectElectrostatic binding: Electrostatics

Implementation Method 2

dual fluorescence emission for real-time visualization

Methodology Applied

Scientific EffectFluorescence emission: Fluorescence

Data Source

PatentUS20250376686A1Multi-functional near-infrared fluorescent polymer dot-sirna for gene expression regulation

Publication Date: 2025.12.11 UNIVERSITY OF NORTH DAKOTA

AI summary

A multi-functional near-infrared fluorescent polymer dot (Pdot)-siRNA nanoplatform is disclosed herein. The disclosed technology addresses challenges in siRNA delivery, including poor stability, degradation, and immune recognition, by utilizing positively charged Pdots synthesized from polymers, and electrostatic binding with negatively charged siRNA. The Pdots exhibit dual fluorescence emission at 588 nm and 775 nm, enabling real-time visualization of cellular uptake and siRNA delivery. The nanoplatform demonstrates efficient inhibition of target gene expression, and protein levels in cells. The Pdots provide minimal toxicity and persist in cells for extended periods, offering a robust tool for therapeutic applications, bioimaging, and molecular labeling. This approach combines siRNA delivery with simultaneous imaging, presenting a versatile method for targeted gene regulation and research applications.