Activatable Antibody Masking for Protease Detection
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Solution Overview
Problem
There is a need for reliable methods to detect specific protease activity in biological samples, as aberrant protease activity is implicated in various disorders, and existing techniques fail to selectively and accurately assess proteolytic activity in tissues.
Innovation Solution
The use of activatable antibodies with a masking moiety and a cleavable linker allows for the detection of protease activity by activating only when specific proteases are present, enabling the binding of the antibody to its target in tissues, thereby selectively detecting protease activity in biological samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection methods are used to assess protease activity, then general protease presence can be detected, but selective and accurate assessment of specific proteolytic activity in tissues cannot be achieved
Solution Approach 1:
The patent employs an intermediary molecule (masking peptide or blocking group) that temporarily prevents antibody binding to the target antigen. This masking intermediary is specifically removed or degraded by the target protease, allowing the antibody to then bind to the antigen only when protease activity is present. This intermediary mechanism enables selective detection of specific protease activity rather than general protease presence.
Solution Approach 2:
The invention utilizes parameter changes in the antibody's binding state - transitioning from a masked/non-binding state to an unmasked/binding state. The antibody's affinity parameter changes from low (when masked) to high (when unmasked by protease cleavage). This parameter change provides a detectable signal that specifically indicates the presence of the target protease activity.
2Adaptability or versatility
If activatable antibodies with masking moieties are used, then selective detection of specific protease activity is achieved, but the complexity of the detection system increases
Solution Approach 1:
The patent merges multiple functions into a single molecular construct - the antibody is combined with the masking peptide and the protease recognition sequence into one integrated activatable antibody molecule. This merging eliminates the need for separate components and complex assembly procedures, reducing overall system complexity while maintaining selectivity.
Solution Approach 2:
The activatable antibody is designed to self-activate through protease cleavage of the masking sequence. The system uses the target protease itself to remove the mask, eliminating the need for external activation mechanisms or additional reagents. This self-service approach simplifies the detection system by allowing the target molecule to perform part of the detection process automatically.
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 the selective detection and localization of specific protease activities in tissues, providing a potent diagnostic tool for identifying protease activity in various disorders, including cancer, and potentially serving as a therapeutic agent by targeting aberrant protease activity.
Implementation Method 1
the protease that cleaves the substrate in the cleavable moiety (CM) of the activatable antibody
Data Source
AI summary
The invention relates generally to compositions and methods for detecting protease activity in a subject or a biological sample using activatable antibodies, and the use of these compositions and methods in a variety of diagnostic indications.