Extracellular Vesicle Quantification via Cholesterol Assay

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Solution Overview

Problem

Current methods for quantifying extracellular vesicles, such as exosomes, are time-consuming and lack scalability, particularly in manufacturing settings, due to reliance on techniques like nanoparticle tracking analysis that are not amenable to high-throughput analysis and are prone to inaccuracies from non-EV particles.

Innovation Solution

A method involving cholesterol content analysis using filtration, ultracentrifugation, and polyethylene glycol precipitation to isolate and quantify extracellular vesicles, correlating cholesterol levels with EV concentrations through reference nanoparticle tracking analysis curves for high-throughput and accurate quantification.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If nanoparticle tracking analysis is used to quantify extracellular vesicles, then measurement precision is improved, but productivity deteriorates due to time-consuming procedures and lack of scalability

Engineering Contradiction:

Improvequantification accuracyVSAvoidthroughput

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent extracts the cholesterol component from extracellular vesicles as a quantifiable marker. By measuring cholesterol content specifically in the EV fraction after ultracentrifugation, the method isolates a reliable quantification target that maintains accuracy while enabling high-throughput analysis through standard biochemical assays

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the mechanical/optical tracking system of nanoparticle tracking analysis with a biochemical cholesterol assay system. This substitution uses chemical reactions and spectrophotometric detection instead of particle tracking microscopy, dramatically increasing throughput while maintaining quantification accuracy through correlation with NTA measurements

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If traditional quantification methods are used, then measurement precision is maintained, but loss of time increases due to lengthy procedures

Engineering Contradiction:

Improvequantification accuracyVSAvoidanalysis time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent performs preliminary separation of extracellular vesicles from cell culture supernatant using ultracentrifugation and filtration before cholesterol measurement. This preliminary action prepares the sample in advance, allowing rapid cholesterol assays to be performed on pre-separated EV fractions without compromising measurement accuracy

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the measurement parameter from direct particle counting to cholesterol content measurement. This parameter change transforms a time-intensive optical measurement into a rapid biochemical assay that can be processed in high-throughput formats while maintaining quantification precision through established correlation

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If nanoparticle tracking analysis is employed, then measurement precision is improved, but device complexity increases due to specialized equipment requirements

Engineering Contradiction:

Improveparticle count accuracyVSAvoidequipment complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts cholesterol as a surrogate marker from extracellular vesicles, eliminating the need for complex particle tracking equipment. By measuring a biochemical component that can be detected with standard spectrophotometers or plate readers, the method maintains quantification accuracy while dramatically simplifying the instrumentation required

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent substitutes complex optical tracking systems with simple biochemical assay systems. The cholesterol measurement uses standard enzymatic assays and spectrophotometric detection that are available in most laboratories, replacing specialized nanoparticle tracking analyzers with common equipment

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 rapid and efficient quantification of extracellular vesicles by correlating cholesterol content with EV concentrations, improving scalability and accuracy over traditional methods.

Implementation Method 1

processing the sample using filtration, ultracentrifugation, or polyethylene glycol (PEG) precipitation

Methodology Applied

Scientific EffectUltracentrifugation: Centrifugal Separation

Implementation Method 2

processing the sample using filtration, ultracentrifugation, or polyethylene glycol (PEG) precipitation

Methodology Applied

Scientific EffectPEG precipitation: Precipitation

Implementation Method 3

processing the sample using filtration, ultracentrifugation, or polyethylene glycol (PEG) precipitation

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Data Source

PatentUS20230184791A1Cholesterol assays for quantifying extracellular vesicles

Publication Date: 2023.06.15 LONZA SALES AG

AI summary

Provided herein are methods of quantifying extracellular vesicle concentration, such as exosomes, by measuring cholesterol content in a sample. Also provided are methods of processing extracellular vesicles to remove non-exosomal species which contain cholesterol.