Polydopamine-Coated Nanoparticles for Live Cell miRNA Detection

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Solution Overview

Problem

Current methods for detecting microRNAs (miRNAs) in live cells require high cell populations and cell lysis, limiting their application in research and therapeutic delivery, and face challenges in transfection efficiency and stability within cells.

Innovation Solution

Development of nanoparticle-based constructs with a core particle coated in polydopamine, where a polynucleotide is non-covalently attached, allowing for effective cell penetration and detection of miRNAs without transfection agents, enabling multiplexed detection and tracking of miRNA levels in live cells.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional methods for detecting miRNAs are used, then detection can be performed, but high cell populations and cell lysis are required, limiting application in live cells

Engineering Contradiction:

Improvedetection capabilityVSAvoidcell lysis requirement

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent uses nanoparticle-based constructs as intermediary carriers that can penetrate cell membranes and deliver polynucleotide probes into live cells without requiring cell lysis. These nanoparticles serve as mediators between the detection system and intracellular miRNAs, enabling detection while maintaining cell integrity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention replaces the mechanical process of cell lysis with a nanoparticle-mediated delivery system that utilizes cellular uptake mechanisms. Instead of mechanically breaking cells open, the patent employs surface-modified nanoparticles that naturally enter cells through endocytosis or other uptake pathways, substituting a gentle biological process for a destructive mechanical one.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Productivity

If transfection agents are used to improve polynucleotide delivery, then delivery efficiency increases, but stability within cells decreases

Engineering Contradiction:

Improvetransfection efficiencyVSAvoidpolynucleotide stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent employs composite nanoparticle constructs consisting of a core particle (gold, silica, or magnetic materials) coated with polydopamine and conjugated with polynucleotide probes. This composite structure provides both efficient cellular uptake through the nanoparticle carrier and enhanced stability through the protective polydopamine coating, resolving the contradiction between delivery efficiency and intracellular stability.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The polydopamine coating on the nanoparticle core acts as a flexible protective shell that shields the polynucleotide from cellular nucleases while maintaining cellular uptake. This thin film barrier provides stability without compromising the delivery function, allowing the polynucleotide to remain stable within the cell after internalization.

Inventive Principle:

Principle #30Flexible shells and thin films

3Strength

If polynucleotide is covalently attached to nanoparticle surface, then attachment strength increases, but polynucleotide accessibility for hybridization decreases

Engineering Contradiction:

Improveattachment strengthVSAvoidhybridization capability

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent employs non-covalent attachment mechanisms (such as affinity-based or electrostatic interactions) that are sufficiently strong to maintain polynucleotide attachment during cellular uptake but allow for functional dynamics inside the cell. This approach prioritizes functional reliability for hybridization over permanent attachment strength, allowing the polynucleotide to become accessible when needed.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 nanoparticle-based approach enables sensitive and specific detection of miRNAs in live cells, including stem cells, with enhanced stability and the ability to monitor differentiation status, overcoming previous limitations in transfection efficiency and cell lysis requirements.

Implementation Method 1

a polynucleotide non-covalently attached to the polymer coating

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 2

the core segment is 15-30 nucleotide in length and hybridizes to a target miRNA of a predetermined nucleotide sequence

Methodology Applied

Scientific EffectHybridization:

Implementation Method 3

the polynucleotide is attached to a detectable label, for example, a fluorescent molecule such as fluorescein isothiocyanate (FITC) or cyanine 3 (Cy3)

Methodology Applied

Scientific EffectFluorescence: Fluorescence

Data Source

PatentUS10240190B2Nano-constructs for polynucleotide delivery

Publication Date: 2019.03.26 THE CHINESE UNIVERSITY OF HONG KONG

AI summary

The present invention provides novel nano-constructs useful for delivering polynucleotides into cells, methods of using the nano-constructs, and methods of making the nano-constructs.