Nanoplasmonic Chip for Real-Time Single Cell Secretion Mapping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for measuring paracrine signaling, such as fluorescent fusion protein tags and immunosandwich assays, face challenges in tracking highly localized and external protein secretions due to tag interference, diffuse signals, and limited temporal resolution, making it difficult to understand spatio-temporal patterns of single cell secretions effectively.
Innovation Solution
A label-free nanoplasmonic imaging technique using a chip with lithographically patterned Au nanostructures on glass coverslips for localized surface plasmon resonance (LSPR) imaging, allowing for real-time, high-resolution mapping of protein secretions without labeling, integrating with traditional microscopy techniques like fluorescence and transmitted light imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluorescent fusion protein tags are used to track secreted proteins, then intracellular signaling can be monitored, but the secreted signal becomes diffuse and difficult to track quantitatively in space and time
Solution Approach 1:
The patent introduces an intermediary approach by using fluorescent tags only for intracellular monitoring while employing a separate detection method (imaging mass spectrometry or affinity-based detection) for extracellular protein identification. This mediator strategy allows the fluorescent tag to serve its intracellular tracking function without compromising the spatial and temporal resolution of secretion measurements, as the actual secreted protein detection occurs through the intermediary detection system that preserves localization information.
2Measurement precision
If immunosandwich assays are used to measure secreted proteins, then quantitative secretion monitoring is achieved, but temporal resolution is limited to hours or days
Solution Approach 1:
The patent replaces the mechanical/chemical assay-based detection system (immunosandwich assays requiring antibody binding and washing steps) with an imaging-based detection system that uses fluorescent tags and optical microscopy. This substitution eliminates the time-consuming procedural steps of traditional assays, enabling temporal resolution on the order of minutes or seconds while maintaining quantitative measurement capabilities through fluorescence intensity calibration.
Solution Approach 2:
The patent implements continuous or near-continuous monitoring by using live-cell fluorescence imaging that can capture secretion events in real-time without interrupting the biological process. Unlike discrete immunosandwich assays that require sample collection and processing at specific time points, the imaging approach maintains continuous observation, preserving the temporal dynamics of secretion events and enabling the detection of rapid secretion bursts or oscillations.
3Quantity of substance
If high-throughput immunosandwich assays measure hundreds or thousands of cells, then statistical power is improved, but temporal resolution is limited by antibody probe introduction
Solution Approach 1:
The patent creates a multi-functional imaging platform that simultaneously achieves high-throughput capability and high temporal resolution. By using automated fluorescence microscopy with high-content imaging software, the system can monitor hundreds or thousands of cells in parallel while capturing temporal dynamics at the single-cell level. The fluorescent tagging approach allows each cell to be individually tracked over time, and the automated imaging system can acquire images at multiple time points across the cell population, thus achieving both high throughput and high temporal resolution through the universal applicability of the imaging method.
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
Enables real-time measurement of protein secretions with millisecond time resolutions, distinguishing burst-like from steady-state secretions, and estimating diffusion constants, providing detailed spatio-temporal data without the limitations of fluorescent probes or immunosandwich assays.
Implementation Method 1
a chip for localized surface plasmon resonance (LSPR) imaging
Data Source
AI summary
A label-free method for the spatio-temporal mapping of protein secretions from individual cells in real time by using a chip for localized surface plasmon resonance (LSPR) imaging. The chip is a glass coverslip compatible for use in a standard microscope having at least one array of functionalized plasmonic nanostructures patterned onto it. After placing a cell on the chip, the secretions from the cell are spatially and temporally mapped using LSPR imaging. Transmitted light imaging and/or fluorescence imaging may be done simultaneously with the LSPR imaging.