MRI Analysis of Endosomal Escape in Drug Delivery Particles

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Solution Overview

Problem

There is no method to quantitatively analyze the endosomal escape efficiency of drug delivery particles, which is crucial for effective drug delivery and substance expression within cells.

Innovation Solution

A method using magnetic resonance imaging (MRI) to measure the magnetic relaxation rate changes as iron oxides are released from drug delivery particles, allowing for the calculation of endosomal escape efficiency through equations that quantify the change in magnetic relaxation rate.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If drug delivery particles are introduced into cells through endosome formation, then the particles can be delivered into cells, but the endosomal escape efficiency varies and cannot be quantitatively analyzed

Engineering Contradiction:

Improvequantitative analysis of endosomal escape efficiencyVSAvoidendosomal escape efficiency

Core Design Contradiction:

Measurement precisionVSDifficulty of detecting and measuring

Solution Approach 1:

The patent uses iron oxide nanoparticles as an intermediary substance loaded into drug delivery particles. These iron oxides serve as a measurable proxy that releases from the particles during endosomal escape, allowing quantitative detection of escape efficiency through magnetic resonance imaging without directly observing the particles themselves

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces direct mechanical or optical observation of particle escape with magnetic field-based detection. By using iron oxides that affect magnetic relaxation rates, the system substitutes physical/optical measurement with magnetic resonance imaging, enabling quantitative analysis of endosomal escape efficiency

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Illumination intensity

If iron oxide-based T2 contrast agent is used, then strong imaging contrast effect is achieved, but the relaxation time is significantly reduced

Engineering Contradiction:

Improveimaging contrast effectVSAvoidrelaxation time

Core Design Contradiction:

Illumination intensityVSDuration of action of stationary object

Solution Approach 1:

The patent converts the harmful effect of significant T2 relaxation time reduction into a beneficial measurement tool. The strong contrast effect and rapid relaxation are utilized as measurable signals to detect and quantify endosomal escape, transforming what would normally be an imaging limitation into a detection advantage

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

Enables the quantitative analysis of endosomal escape efficiency, providing insights into the effectiveness of drug delivery particles in escaping endosomes and reaching the cytoplasm or nucleus.

Implementation Method 1

particles which are introduced into the cells and surrounded by the endosomes should be able to escape the endosomes and move to a nucleus or perform functions thereof in the cytoplasm

Methodology Applied

Scientific EffectEndosomal escape:

Implementation Method 2

measuring, in a cell into which particles having iron oxides loaded therein are ingested, a magnetic resonance signal which changes as the iron oxides are released from the particles to the cell

Methodology Applied

Scientific EffectMagnetic resonance:

Implementation Method 3

iron oxide-based T2 contrast agent has a very significant effect of reducing the T2 relaxation time, and exhibits a strong imaging contrast effect due to a decrease in the T2 relaxation time

Methodology Applied

Scientific EffectMagnetic relaxation:

Data Source

PatentUS12613204B2Method for analyzing endosomal escape efficiency of drug delivery particles

Publication Date: 2026.04.28 SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION

AI summary

A method for quantitatively analyzing endosomal escape efficiency of drug delivery particles includes measuring magnetic resonance signals (MR signals) reflected upon emission of electromagnetic waves (for example, radio waves) into cells having iron oxide-carrying particles ingested thereinto, with the aid of a magnetic resonance imaging device, and obtaining a change rate of magnetic relaxation with time from the measurements.