Optical Ion-Channel Screening via Light-Activated Switches
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for screening drug candidates affecting ion-channel functionality are inefficient, costly, and require physical contact with cells, limiting the ability to quickly and effectively identify compounds that modify ion-channel activity.
Innovation Solution
An optical-based screening system using optically responsive cell lines expressing light-activated ion channels and pumps, such as Channelrhodopsin-2 and NpHR, which allow for non-contact stimulation and detection of ion-channel activity through light-induced voltage changes, enabling rapid and high-throughput screening of drug candidates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If patch clamping with micropipettes is used to measure ion-channel functionality, then measurement precision is improved, but device complexity and ease of operation deteriorate due to required physical contact and manual manipulation
Solution Approach 1:
The patent replaces the mechanical micropipette contact system with an optical field-based system. Light fields are used to stimulate and detect ion-channel activity without physical contact, eliminating the need for micropipette manipulation while maintaining measurement capability through optical detection of cellular responses
Solution Approach 2:
The patent introduces optical fields as an intermediary between the researcher and the cell. Instead of direct mechanical contact with micropipettes, light serves as the mediator to deliver stimulation and carry information about ion-channel activity, enabling contactless measurement with comparable precision
2Measurement precision
If patch clamping methods are used for drug screening, then measurement precision is improved, but productivity deteriorates due to time-consuming manual operations
Solution Approach 1:
By replacing manual mechanical micropipette operations with automated optical field application and detection, the system eliminates time-consuming manual setup and measurement steps. Multiple cells can be illuminated and monitored simultaneously, enabling high-throughput screening while maintaining measurement accuracy through optical detection methods
Solution Approach 2:
The patent divides the screening process into independent optical measurement units that can operate in parallel on multiple cells simultaneously. This segmentation allows concurrent measurement of ion-channel activity across many cells, dramatically increasing screening throughput compared to sequential manual patch clamping
3Measurement precision
If conventional screening techniques are used, then measurement capability is maintained, but loss of time increases due to sequential testing requirements
Solution Approach 1:
The optical field system enables continuous simultaneous measurement of ion-channel activity across multiple cells throughout the screening process. Unlike sequential manual methods where measurement stops between samples, the optical system maintains continuous illumination and detection, allowing parallel data collection that eliminates idle time between measurements
Solution Approach 2:
The screening assay is segmented into independent optical measurement channels, each monitoring a different cell or drug condition simultaneously. This parallel segmentation allows all measurements to proceed concurrently rather than sequentially, reducing total screening time while maintaining the ability to detect drug effects with the same precision as conventional methods
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 reduces the time and cost of screening by eliminating the need for physical manipulation, allowing for simultaneous testing of multiple drugs and providing high temporal precision in characterizing drug effects on ion channels, thereby improving the efficiency of ion-channel drug discovery.
Implementation Method 1
Light triggers optically responsive ion channels in the cells causing a change in the voltage seen across the cell membrane
Data Source
AI summary
A variety of applications, systems, methods and constructs are implemented for use in connection with screening of ion-channel modulators. Consistent with one such system, drug candidates are screened to identify their effects on cell membrane ion channels and pumps. The system includes screening cells having light responsive membrane ion switches, voltage-gated ion switches and fluorescence producing voltage sensors. A chemical delivery device introduces the drug candidates to be screened. An optical delivery device activates the light responsive ion switches. An optical sensor monitors fluorescence produced by the voltage sensors. A processor processes data received from the optical sensor. A memory stores the data received from the optical sensor.