IgG Cysteine Protease Cleavage for Antibody Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for detecting immunoglobulin M (IgM), IgA, and IgE antibodies are unreliable and insufficiently sensitive due to interference from immune complexes with IgG, which complicates the diagnosis and treatment of autoimmune diseases and organ transplantation, particularly in highly sensitized patients.
Innovation Solution
The use of an IgG cysteine protease, such as IdeS or IdeZ, to cleave IgG immune complexes, allowing for improved detection of IgM, IgA, and IgE antibodies by preventing interference and reducing false-positive results in assays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current immunoassays are used to detect IgM, IgA, and IgE antibodies, then the detection process is simple, but the sensitivity and reliability are insufficient due to interference from IgG immune complexes
Solution Approach 1:
The patent applies preliminary action by treating the sample with IgG cysteine protease before the detection step. This pre-treatment cleaves IgG immune complexes into smaller fragments that no longer interfere with subsequent IgM, IgA, or IgE antibody detection, thereby improving measurement precision without requiring complex equipment modifications
Solution Approach 2:
The patent extracts the interfering component (IgG) from the sample matrix by using IgG-specific cysteine protease to cleave and remove intact IgG molecules and large immune complexes. This extraction of the harmful interfering substance allows the detection assay to proceed with improved sensitivity and reliability
2Reliability
If IgG cysteine protease is used to cleave immune complexes, then detection sensitivity improves, but the assay procedure becomes more complex
Solution Approach 1:
The patent changes the chemical state of IgG in the sample by using IgG cysteine protease to cleave disulfide bonds and break down intact IgG molecules and large immune complexes into smaller peptides. This parameter change (molecular structure modification) eliminates interference and improves detection reliability while maintaining a relatively simple procedural framework
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 enhances the sensitivity and specificity of antibody detection, enabling more accurate diagnosis and treatment of autoimmune diseases and improving organ transplantation outcomes by reducing the risk of graft rejection and chronic rejection.
Implementation Method 1
The use of an IgG cysteine protease, such as IdeS or IdeZ, to cleave IgG immune complexes
Data Source
AI summary
The present invention relates to improved methods for detecting immunoglobulin M (IgM), immunoglobulin A (IgA) and immunoglobulin E (IgE) antibodies, and new therapies for diseases and conditions mediated by pathogenic antibodies and antibody complexes.