NIR Fluorophore Probe for Senescent Cell Detection
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Solution Overview
Problem
Current methods for visualizing senescent cells in vivo lack effective probes that can specifically detect senescence-associated β-galactosidase (SA-β-Gal) activity, limiting real-time monitoring and treatment evaluation of senescence-related diseases.
Innovation Solution
A novel probe comprising a biomarker-triggered moiety, a near-infrared (NIR) fluorophore reporter, a self-immolative linker, and a self-immobilizing moiety that 'turns on' fluorescence in the presence of SA-β-Gal, enabling specific visualization of senescent cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional fluorescent probes are used for β-gal detection, then detection capability is provided, but tissue autofluorescence interferes with signal detection in vivo
Solution Approach 1:
The patent transitions from conventional visible light fluorescent probes to near-infrared fluorescent probes, changing the emission wavelength parameter to 650-900 nm. This parameter change shifts the detection window away from the autofluorescence region, enabling specific detection of SA-β-Gal activity in vivo while minimizing tissue autofluorescence interference.
2Measurement precision
If existing β-gal detection methods are used, then detection is possible, but real-time monitoring in living subjects is not enabled
Solution Approach 1:
The probe is designed with a self-activating mechanism where the fluorophore is masked by a galactoside moiety that is specifically recognized and hydrolyzed by SA-β-Gal. This self-service mechanism allows the probe to automatically activate and generate fluorescence signal only when encountering senescent cells, enabling real-time monitoring without external intervention.
3Measurement precision
If conventional probes are used, then detection is possible, but specific visualization of senescent cells in vivo is not achieved
Solution Approach 1:
The probe incorporates a galactoside-triggered fluorophore system with localized specificity. The galactoside moiety is specifically recognized by SA-β-Gal, creating a local chemical interaction that activates fluorescence only at the site of senescent cells. This local quality approach ensures specific visualization of senescent cells while maintaining low background signal in non-senescent tissues.
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 probe effectively differentiates senescent cells from normal cells, as demonstrated by increased fluorescence in cells treated with senescence-inducing agents, and shows promise for real-time imaging of senescence in tumors, providing a tool for evaluating treatment responses.
Implementation Method 1
a near infrared (NIR) fluorophore reporter
Implementation Method 2
a self-immolative linker
Data Source
AI summary
A probe comprising a biomarker-triggered moiety, a near infrared (NIR) fluorophore reporter, a self-immolative linker and a self-immobilizing moiety for visualization of senescent cells and methods of use thereof.