Cell Surface Antibody Coupling via Sialic Acid Metabolic Labeling
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Solution Overview
Problem
Current cellular immunotherapy methods for cancer treatment face challenges such as cell cytokine storm, off-target effects, high costs, complexity in CAR-T cell therapy, and low efficacy of PD-1 immune checkpoint blockade therapy, necessitating innovative approaches for antibody-cell surface coupling.
Innovation Solution
A method involving chemical modification of sialic acid to introduce an azide group on cell surfaces, followed by bio-orthogonal reactions with a conjunction compound to attach antibodies, allowing for efficient and cost-effective coupling of antibodies to immune cells like T cells and natural killer cells without requiring gene editing or enzyme catalysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CAR-T cell therapy is used to treat tumors, then the killing capability of immune cells is improved, but the complexity and cost of production increase significantly
Solution Approach 1:
The patent uses an antibody as an intermediary component that bridges the immune cell and the tumor target. Instead of directly modifying T cells with complex chimeric antigen receptors, the method couples antibodies to the cell surface that can recognize tumor antigens. This intermediary approach simplifies the production process while maintaining targeting capability and killing efficacy.
2Reliability
If PD-1 immune checkpoint blockade therapy is applied, then the recognition and killing function of immune cells is restored, but the treatment efficacy is low and drug resistance occurs
Solution Approach 1:
The patent merges the advantages of adoptive cell therapy with antibody-based targeting. By coupling antibodies to the surface of immune cells, the system combines the in vivo persistence and adaptability of living cells with the high specificity and potency of antibody-targeted therapy. This hybrid approach overcomes the limitations of both standalone methods.
3Reliability
If conventional antibody-cell coupling methods are used, then the targeting capability is achieved, but the process requires gene editing or enzyme catalysis which increases complexity and cost
Solution Approach 1:
The patent replaces complex biological manipulation methods (gene editing, enzyme catalysis) with a simpler chemical conjugation approach. The antibody is coupled to the cell surface through chemical reactions between functional groups on the antibody and functional groups introduced on the cell surface, eliminating the need for sophisticated genetic engineering infrastructure and reducing manufacturing complexity.
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 method enables simple, safe, and efficient antibody modification on cell surfaces, enhancing the targeting and killing capabilities of immune cells against cancer cells, as demonstrated by improved antitumor effects in vitro and in vivo models, with the potential for universal application and reduced treatment costs.
Implementation Method 1
absorbing the sialic acid derivative by the cell, and expressing the azide group on a membrane surface of the cell through a sialic acid metabolic pathway of the cell
Implementation Method 2
a first active group configured to react with a sulfhydryl group or an amino group, and the first active group is connected to the sulfhydryl group or the amino group of the antibody by a first reaction
Implementation Method 3
a second active group configured to bio-orthogonally react with the azide group, and the second active group is connected to the azide group by a second reaction
Data Source
AI summary
A method for coupling an antibody to a surface of a cell comprises the following steps: (1) chemically modifying sialic acid to obtain a sialic acid derivative containing an azide group; (2) absorbing the sialic acid derivative by the cell to obtain a cell modified with the azide group; (3) modifying the antibody with a conjunction compound to obtain a modified antibody; (4) co-culturing the modified antibody with the cell modified with the azide group. The present disclosure modifies natural sialic acid molecules in vitro through chemical synthesis methods, and utilizes modified natural sialic acid molecules to realize antibody modification on the surface of the cell. The modification method of the present disclosure is simple, low-cost, safe, and efficient, does not need complex gene editing or enzyme catalytic operation, and has universality. In theory, the modification method can realize the coupling of any antibody or macro-molecular substance on the surface of the cell.