Phosphor Integrated Dot Immunostaining for ADC Quantification
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Solution Overview
Problem
Current methods for detecting antibody-drug conjugates (ADCs) are not quantitative enough to accurately assess the expression level of target molecules on cells and interactions with ADCs, making it difficult to determine the efficacy and pharmacokinetics of ADCs, particularly in cancer treatment.
Innovation Solution
The use of immunostaining with fluorescent nanoparticles, such as phosphor-integrated dots (PIDs), to visualize and quantify the components of ADCs, including the drug, antibody, and target molecules, allowing for precise localization and interaction analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If immunostaining with DAB is used to detect HER2 protein, then the staining level can be determined, but the quantification is limited to a four-scale rating and depends on pathologist proficiency
Solution Approach 1:
The patent replaces the subjective mechanical assessment process of DAB staining with an objective optical detection system using fluorescent nanoparticles (PIDs). The fluorescent signal intensity can be precisely measured and quantified by imaging systems, eliminating the four-scale rating limitation and pathologist dependency while maintaining ease of staining operation.
Solution Approach 2:
The patent transitions from the brown colorimetric DAB signal to fluorescent color signals emitted by PIDs. Different fluorescent colors can be used to detect multiple targets simultaneously, and the intensity of fluorescence provides continuous quantitative information rather than discrete scale ratings, thereby improving measurement precision.
2Measurement precision
If FISH is used to detect HER2 gene, then quantitative inspection is achieved, but it cannot directly assess the amount and intracellular localization of HER2 protein
Solution Approach 1:
The patent creates a multi-functional detection system where PIDs can detect both the presence/amount of target molecules (providing quantification like FISH) and their intracellular localization (providing spatial information that FISH cannot). The fluorescent nanoparticles can be conjugated to antibodies that recognize specific protein epitopes, enabling simultaneous quantitative and spatial assessment of HER2 protein.
Solution Approach 2:
The patent uses antibody-PID conjugates as intermediaries that specifically bind to HER2 protein. This allows the detection system to target the protein directly rather than the gene, providing information about actual protein expression levels and localization while maintaining quantitative capability through fluorescent signal intensity measurement.
3Device complexity
If conventional detection methods are used for ADCs, then the detection process is simple, but the sensitivity is insufficient to detect ADCs accurately
Solution Approach 1:
The patent changes the detection parameter from conventional low-sensitivity methods to fluorescent signal detection. The PIDs emit strong fluorescent signals that can be detected at very low concentrations, dramatically improving sensitivity. The fluorescent intensity can be precisely measured, providing accurate quantification of ADC levels while maintaining relatively simple procedural steps.
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
This approach enables high-accuracy visualization and quantification of ADCs within cells, providing valuable information for diagnosing and treating disorders by determining the expression level and interaction of ADCs with target molecules, thus aiding in the selection of suitable patients and dosage regimen planning.
Implementation Method 1
a protein of interest is labeled with a nanosized fluorescent particle, that is, for example, a phosphor integrated dot (PID) which contains resin as the matrix and integrated phosphors such as fluorochromes and quantum dots. The protein of interest is labeled by the PID (which may also be referred to as 'fluorescent substance-integrated nanoparticle' or 'phosphor-containing particle' in other literatures) and irradiated with excitation light compatible with fluorescent substances integrated inside the particle, which enables observation of the protein of interest as a bright spot with high luminance.
Data Source
AI summary
The present invention relates to a method for detecting an antibody-drug-conjugate and relates to a method for determining the efficacy of an antibody-drug-conjugate with high accuracy by a quantitative technique for identifying an expression level of a target molecule in a target cell of the antibody-drug-conjugate and interactions therebetween. According to the method, visualizing a drug and an antibody, or components of an antibody-drug-conjugate, by immunostaining with a phosphor integrated dot enables detection of the antibody-drug-conjugate and the components.