Label-Free Optical Imaging for Single-Cell T Cell Mass Tracking
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Solution Overview
Problem
Current methods for measuring T cell mediated cytotoxicity are limited by their bulk or surrogate nature, which fails to directly track cytotoxic T cells within a mixed population, making it difficult to identify and isolate specific T cell receptors for cancer immunotherapy.
Innovation Solution
The use of label-free optical imaging techniques, such as live cell interferometry, digital holographic microscopy, and lateral shearing interferometry, to directly measure changes in mass of T cells and target cells, indicating T cell activation and cytotoxic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bulk measurement assays (51Cr release, ELISPOT) are used to measure T cell cytotoxicity, then population-level cytotoxic capacity can be assessed, but single-cell resolution and direct tracking of specific T cells is lost
Solution Approach 1:
The patent replaces complex mechanical/biochemical assays (51Cr release, ELISPOT) with optical measurement systems that detect physical changes in cell mass and morphology. This substitution enables single-cell resolution while simplifying the measurement approach through direct optical observation of cytotoxic events.
Solution Approach 2:
The patent monitors dynamic parameter changes in T cells (mass increase during activation) and target cells (mass decrease during killing) to identify cytotoxic events. By tracking these physical parameter changes over time, the system achieves single-cell precision without requiring complex biochemical labeling or surrogate markers.
2Reliability
If fluorescence labeling techniques are used to track T cells, then cell identification is enabled, but transduction inefficiencies and cell exhaustion during culture occur
Solution Approach 1:
The patent uses label-free optical imaging that detects intrinsic physical properties of cells (mass, refractive index) without requiring external labeling. This self-service approach eliminates transduction inefficiencies and avoids introducing artifacts from fluorescent tags, enabling reliable tracking of T cells through culture and differentiation.
3Loss of information
If surrogate markers (cytokine secretion, antigen specificity) are used to measure cytotoxicity, then indirect assessment is possible, but direct tracking of cytotoxic T cells is prevented
Solution Approach 1:
The patent extracts the direct measurement of cytotoxicity by monitoring physical changes in both T cells and target cells simultaneously. This extraction of the core cytotoxic event from surrogate markers enables direct identification and isolation of functional cytotoxic T cells, eliminating information loss about which cells are actually killing targets.
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 direct identification and quantification of T cell activation and cytotoxicity at the single cell level, facilitating the isolation and cloning of specific T cell receptors for use in cancer immunotherapy.
Implementation Method 1
using label-free optical imaging techniques (e.g., LSI, lateral shearing interferometry, digital holographic microscopy)
Implementation Method 2
using label-free optical imaging techniques (e.g., LSI, lateral shearing interferometry, digital holographic microscopy)
Implementation Method 3
lateral shearing interferometry
Data Source
AI summary
In certain embodiments methods of identifying T cell receptors that respond to specific target cell antigens are provided, where the methods comprise providing a substrate bearing a plurality of target cells (e.g., mammalian cells); contacting the target cells on the substrate with CD8+ T cells; and using label-free optical imaging to identify an increase in mass of a T-cell and/or a decrease in mass of a target cell, where an increase in mass of a T cell and/or a decrease in mass of a target cell is an indicator that said T cell bears a T cell receptor activated by antigens presented on said target cell.