Single-Cell Radionuclide Uptake Sorting via Chemical Sensors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for molecular analysis, such as flow cytometry, are limited in detecting small molecules within single cells due to lack of sensitivity and inability to accurately represent individual cell characteristics, especially in cancer research where bulk measurements can be misleading.
Innovation Solution
A high-throughput single-cell scintillation counting system that uses radiolabeled molecules and chemical sensors activated by reactive oxygen species to detect and sort cells based on radionuclide uptake, integrating with conventional flow cytometry or microfluidic devices to measure and analyze single-cell radionuclide uptake.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bulk measurement methods (liquid scintillation counting, mass spectroscopy) are used to detect small molecules, then quantitative detection sensitivity is improved, but the ability to resolve individual cell characteristics is lost
Solution Approach 1:
The invention segments the bulk measurement approach by introducing single-cell encapsulation using microfluidic droplets or microchambers. Each encapsulant contains a single cell, allowing independent detection of radionuclide uptake in each cell while maintaining the sensitivity of bulk measurement methods. This segmentation enables simultaneous achievement of high detection sensitivity and single-cell resolution.
Solution Approach 2:
The invention uses chemical sensors as intermediaries between the radionuclide decay events and the detection system. The chemical sensors convert the invisible radionuclide decay into detectable signals (fluorescence, light scattering, or other optical properties), enabling sensitive detection at the single-cell level without requiring direct detection of the radioactive particles themselves.
2Productivity
If conventional flow cytometry is used to analyze single cells, then high-throughput single-cell analysis is enabled, but detection of small molecules like drugs and metabolites remains invisible
Solution Approach 1:
The invention introduces chemical sensors as intermediaries that convert radionuclide decay events into detectable optical signals. These sensors enable conventional flow cytometry instruments to detect small molecules that would otherwise be invisible, by transforming the detection of invisible radionuclide decay into visible fluorescence or light scattering signals that can be measured by standard flow cytometers.
Solution Approach 2:
The invention replaces the mechanical/optical detection limitations of conventional flow cytometry with a chemical-to-optical conversion system. By using chemical sensors that emit light or change optical properties in response to radionuclide decay, the system substitutes the inability to detect small molecules with a chemical sensing mechanism that produces measurable optical signals.
3Measurement precision
If radiolabeled molecules are used to track small molecule uptake, then sensitivity for detecting individual cell characteristics is improved, but the complexity of the detection system increases
Solution Approach 1:
The invention uses chemical sensors as intermediaries that simplify the detection process. Instead of requiring complex direct detection of radionuclide decay, the chemical sensors convert the decay events into standard optical signals that can be detected by conventional flow cytometry instruments. This intermediary approach maintains high measurement precision while avoiding the need for specialized detection equipment.
Solution Approach 2:
The invention makes conventional flow cytometry instruments universal by enabling them to detect both traditional fluorescent markers and radionuclide uptake through the chemical sensor system. This multi-functionality allows the same instrument to perform both conventional flow cytometry analyses and radionuclide-based single-cell measurements, reducing the need for specialized equipment.
4Quantity of substance
If bulk measurements are used to quantify radionuclide uptake, then quantitative detection is achieved, but the ensemble average fails to represent individual cell characteristics
Solution Approach 1:
The invention segments the population into individual encapsulated cells within microfluidic droplets or microchambers. This segmentation allows quantitative measurement of radionuclide uptake in each individual cell while preserving the heterogeneity between cells. The segmented approach enables simultaneous quantitative analysis and maintenance of individual cell characteristics, eliminating the averaging effect that occurs in bulk measurements.
Data Source
AI summary
A method of sensing radionuclides in cells is provided that includes exposing a cell of interest to a radiolabeled molecule, encapsulating the cell of interest with a chemical sensor in an encapsulant to hold the cell of interest and the chemical sensor in proximity, where the radiolabeled molecule decays to emit an energetic particle, and detecting a fluorescence or optical absorption signal in the chemical sensor induced by the radio molecule decay, using an illumination source and a detector, where single-cell analysis with the radiolabeled molecule is performed.