Antibody Purification via Antigen-Expressing Cell Adsorption
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Solution Overview
Problem
Current methods for purifying antibodies, particularly polyclonal antibodies specific to blood group antigens, are inadequate as they fail to selectively extract antibodies with specific affinity, resulting in products with multiple specificities and low levels of the desired antibody, especially for rarer blood group antigens.
Innovation Solution
The method involves contacting a source of antibodies with cells expressing a specific antigen to permit binding and subsequent isolation of the antibodies, using adsorption techniques and antigen blocking protocols to achieve selective purification of antibodies with specific affinity for a particular antigen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If current monoclonal purification methods are used to purify polyclonal antibodies, then all IgG antibodies are purified from the sample, but the product contains antibodies with multiple specificities and relatively low levels of the desired specific antibody
Solution Approach 1:
The invention segments the antibody purification process into multiple selective steps. First, polyclonal antibodies are purified from plasma using standard methods. Then, the purified polyclonal antibodies are incubated with red blood cells expressing the specific blood group antigen of interest. This two-stage segmentation allows initial bulk purification followed by specific antigen-binding antibody selection, thereby achieving both high quantity and high specificity of the desired antibody.
Solution Approach 2:
The invention uses red blood cells expressing the specific blood group antigen as an intermediary medium. These red blood cells act as a selective mediator that binds only to polyclonal antibodies with specificity for the target antigen. By using this biological intermediary, the method achieves selective enrichment of the desired antibody from the polyclonal mixture without requiring direct purification of the specific antibody molecule.
2Reliability
If standard purification procedures are used for rare blood group antibodies, then purification is achieved, but the yield of antibodies with desired specificity is low
Solution Approach 1:
The invention applies preliminary action by first purifying polyclonal antibodies from plasma before performing the specific enrichment step. This preliminary purification removes contaminants and concentrates the antibody mixture, making the subsequent selective binding step more efficient. By preparing the antibody source in advance through polyclonal purification, the method ensures higher reliability and yield when extracting rare blood group specific antibodies.
Solution Approach 2:
The invention uses red blood cells as a biological template or copy of the target antigen structure. By incubating polyclonal antibodies with red blood cells that express the specific blood group antigen, the method creates a selective environment where only antibodies matching the antigen template will bind. This copying approach using natural red blood cells ensures high specificity and improves the yield of rare antibody specificities.
3Adaptability or versatility
If polyclonal material is procured for rare blood group antigens, then antibody source is obtained, but selective purification of the specific antibody is difficult
Solution Approach 1:
The invention applies self-service by allowing the polyclonal antibodies themselves to perform the selection function. The polyclonal antibody mixture is incubated with red blood cells expressing the target antigen, and the antibodies that bind to the red blood cells are directly used for the diagnostic application. This self-service approach eliminates the need for complex additional purification steps, making the process easier while maintaining high adaptability for different rare blood group antigens.
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 allows for the efficient purification of antibodies with specific affinity for a particular antigen, reducing contamination and increasing the yield of antibodies with desired specificity, particularly useful for rare blood group antibodies.
Implementation Method 1
contacting a source of antibodies with a cell expressing an antigen under conditions which permit binding between the antigen and any antibodies within the source
Data Source
AI summary
Disclosed are methods by which compounds/molecules capable of binding antigens, for example antibody type compounds/molecules, can be purified, extracted and/or selected. The methods may be used to purify, extract or select a specific type (or types) of binding agent from a mixed composition. The methods may be used to extract or purify specific binding agents from mixed compositions, which compositions comprise other agents capable of binding other antigens. The methods may find particular application as methods for the purification of blood group antigen antibodies.