Multidimensional Labeled MHC Multimers for High-Throughput T-Cell Detection
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Solution Overview
Problem
Current methods for detecting antigen-specific T-cells in biological samples are limited by the number of channels available in flow cytometry, restricting the analysis to only a few antigen specificities per sample, and existing technologies like MHC microarrays have not been widely adopted for multiplexed measurement of T-cell responses.
Innovation Solution
The use of multidimensional labeled antigen presenting compounds, such as major histocompatibility complexes (MHC) loaded with three or more predetermined antigens, each represented by at least two different labels, allowing for the detection of multiple antigen-specific cells in a single sample through combinatorial coding and flow cytometry analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional flow cytometry with single-label MHC multimers is used, then detection of antigen-specific T cells is achieved, but the number of antigen specificities that can be monitored is limited to a few per sample
Solution Approach 1:
The patent transitions from single-label to multi-label MHC multimers, adding dimensional complexity to the labeling system. By using combinations of multiple fluorochromes (e.g., PE, APC, Qdots) on single MHC multimers, the system creates a multi-dimensional detection space that exponentially increases the number of distinguishable antigen specificities beyond the traditional single-channel limitation
Solution Approach 2:
The patent makes single MHC multimers perform multiple functions by equipping them with multiple fluorescent labels. A single MHC multimer can simultaneously encode multiple antigen specificities through combinatorial labeling, allowing one reagent to replace multiple traditional single-label multimers and enabling comprehensive monitoring of numerous T cell responses in parallel
2Quantity of substance
If multiple fluorochromes are used to increase detection channels, then more antigen specificities can be analyzed, but the maximum number remains restricted to four due to spectral overlap and detection limitations
Solution Approach 1:
The patent applies local quality by using quantum dots with distinct, non-overlapping emission spectra at specific wavelengths (565nm, 585nm, 605nm, 655nm, 705nm, 800nm). Each quantum dot type provides a localized, well-defined spectral signature that can be independently detected, allowing simultaneous monitoring of multiple T cell populations with high measurement precision without the spectral overlap problems of traditional fluorochromes
Solution Approach 2:
The patent changes the detection parameter from traditional fluorochrome emission spectra to quantum dot size-tuned emission wavelengths. By selecting quantum dots with specific diameters (2-10 nm ranges), the system achieves well-separated emission peaks that can be resolved by flow cytometry, enabling detection of more T cell populations while maintaining high measurement precision through the unique size-wavelength relationship of quantum dots
3Quantity of substance
If MHC microarrays are used for spatial encoding of T cell specificity, then multiplexed measurement is possible, but the technology has not been widely adopted due to lack of demonstrated value
Solution Approach 1:
The patent replaces the mechanical spatial encoding system of MHC microarrays with a chemical/optical encoding system using multi-label fluorescent MHC multimers detected by flow cytometry. This substitution eliminates the need for spatial positioning and array fabrication, simplifying the workflow to direct staining and flow-based detection, thereby improving ease of operation while maintaining high multiplexing capability
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 simultaneous analysis of a large number of antigen-specific cell responses in a single sample, increasing sensitivity and reducing background signals, thereby allowing for the detection of multiple antigen-specific T-cells, including those responsive to melanoma-associated antigens, with high throughput.
Implementation Method 1
Antigen responsive cells, such as T-cells and B-cells, are capable of, amongst others, recognizing virus-infected cells and tumor cells by monitoring the presence of disease-specific peptide-major histocompatibility complexes (MHC) using their clone-specific T cell receptor (TCR)
Implementation Method 2
soluble multimeric pMHC complexes coupled to fluorochromes can be used to detect antigen-specific T cells by flow cytometry
Data Source
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AI summary
The present invention relates to methods for detecting antigen responsive cells in a sample using multidimensional labeled antigen presenting compounds, such as antigen-major histocompatibility complexes (MHC). Further, the present invention relates to the use of the present multidimensional labeled antigen presenting compounds, such as antigen-major histocompability complexes (MHC), for detecting antigen responsive cells in a sample, preferably a single sample, such as a blood sample. The present method allows high-throughput analysis of specific antigen responsive cells, such as T- and B-cells, thereby providing, for example, high-throughput methods for monitoring of diseases or conditions and the development of immunotherapeutics, vaccines, or the identification epitopes or immunogenic amino acid sequences.