Water-Soluble Senescence Imaging Compounds for Lipofuscin Detection

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Solution Overview

Problem

Current methods for detecting senescent cells, such as SA-β-gal and lipofuscin detection using Sudan Black B (SBB), face challenges with sensitivity, solubility, and compatibility with aqueous media, limiting their broad application in senescence detection and visualization.

Innovation Solution

Development of water-soluble SBB analogues linked to a fluorescent dye moiety that allow direct visualization and isolation of senescent cells through methods like histochemical staining, immunohistochemistry, flow-cytometry, and fluorescence-activated cell sorting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If Sudan Black B (SBB) is used for lipofuscin detection, then senescence detection is possible, but the compound lacks solubility in aqueous media and has limited sensitivity

Engineering Contradiction:

Improvesenescence detection sensitivityVSAvoidsolubility in aqueous media

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent modifies the chemical structure of SBB by changing its solubility parameters while maintaining its ability to bind lipofuscin. The compound is designed to be water-soluble through the incorporation of hydrophilic groups, allowing it to dissolve in aqueous media without sacrificing its affinity for lipofuscin, thus resolving the contradiction between solubility and detection sensitivity.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite molecular structure that combines the lipofuscin-binding capability of SBB with water-soluble functional groups. This composite approach allows the compound to exhibit both the specific binding activity needed for sensitive senescence detection and the solubility required for practical application in aqueous biological systems.

Inventive Principle:

Principle #40Composite materials

2Measurement precision

If conventional senescence detection methods are used, then detection is possible, but the methods lack specificity and require complex procedures

Engineering Contradiction:

Improvedetection specificityVSAvoiddetection procedure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts and isolates the key functional elements needed for specific senescence detection from complex procedural requirements. By designing a compound that specifically binds to lipofuscin, a hallmark of senescent cells, the method eliminates the need for complex multi-step protocols while achieving high specificity through the selective affinity of the compound for senescence-related molecules.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention replaces complex mechanical and procedural detection systems with a simpler chemical binding approach. Instead of requiring complex staining protocols, microscopy, or multiple reagents, the water-soluble SBB analogue directly binds to lipofuscin in a simplified manner, reducing procedural complexity while maintaining or improving detection specificity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If SA-β-gal assay is used for senescence detection, then detection can be performed, but the method requires fresh/frozen material and preserves enzymatic activity under strict conditions

Engineering Contradiction:

Improvesenescence detection accuracyVSAvoidsample processing requirements

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent changes the operational parameters of senescence detection by using a compound that can detect lipofuscin in fixed and archived samples rather than requiring fresh or frozen material. This allows detection to be performed on samples that have been processed, stained, or stored under various conditions, significantly easing sample processing requirements while maintaining detection accuracy.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention enables preliminary detection on archived and fixed samples before further processing or analysis is needed. By designing a compound that binds lipofuscin in fixed states, the method allows researchers to detect senescence in samples that have already been prepared, stained, or stored, eliminating the need for immediate fresh or frozen sample processing.

Inventive Principle:

Principle #10Preliminary action

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 new compounds provide high sensitivity and specificity for senescence detection in various biological samples, including fresh and preserved states, enabling accurate imaging and isolation of senescent cells.

Implementation Method 1

compounds comprising SSB analogues linked to a fluorescent dye moiety (fluorophore)

Methodology Applied

Scientific EffectFluorescence: Fluorescence

Data Source

PatentUS20260077067A1Imaging compounds for detecting or imaging senescent cells

Publication Date: 2026.03.19 UNIVERSITY OF DUNDEE

AI summary

A compound, or a salt or solvate thereof, according to formula I as defined herein and pharmaceutical composition comprising said compound. Compounds of formula I are capable of detecting senescence. As such, these compounds are useful in methods of detecting or imaging senescent cells or extracts thereof or senescence in a subject or a biological sample taken from a subject.