Ion Channel Screening System Using Chemical Depolarization
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Solution Overview
Problem
Current ion channel screening methods require complex and time-consuming electrical stimulation to induce depolarization, limiting their efficiency for large-scale and primary screening applications.
Innovation Solution
A novel screening system utilizing inwardly rectifying K ion channels to control depolarization and cell death without electrical stimuli, by expressing specific ion channels that deepen or shorten the resting membrane potential, allowing for the evaluation of test compounds' effects on target ion channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical stimulation is applied to induce depolarization in screening systems, then cell death can be induced by the cell death induction system, but the screening process becomes complex and time-consuming
Solution Approach 1:
The patent extracts and eliminates the electrical stimulation device from the screening system by using a K ion channel inhibitor (such as Ba2+) to induce depolarization chemically instead of electrically. This removes the complex electrical stimulation apparatus while maintaining the ability to induce depolarization and subsequent cell death reliably
Solution Approach 2:
The patent changes the method of inducing depolarization from electrical parameters (voltage, current, pulse duration) to chemical parameters (K ion channel inhibitor concentration, type). This parameter change simplifies the system by replacing complex electrical control with simpler chemical addition while maintaining reliable depolarization induction
2Measurement precision
If electrical stimulation is used to induce depolarization for screening, then the screening can detect compound effects on ion channels, but the screening efficiency decreases due to time and effort requirements
Solution Approach 1:
The patent applies preliminary action by pre-loading the screening cells with a K ion channel inhibitor (such as Ba2+) before adding test compounds. This preliminary chemical preparation creates a primed state where depolarization can be induced without requiring time-consuming electrical stimulation protocols, thereby increasing screening throughput while maintaining detection accuracy
Solution Approach 2:
The patent substitutes the mechanical/electrical stimulation system with a chemical system. Instead of using electrical fields to induce depolarization, the system uses K ion channel inhibitors to chemically induce depolarization. This substitution eliminates the need for complex electrical equipment and reduces screening time, improving productivity while preserving the ability to accurately detect compound effects on ion channels
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 efficient and simplified screening by controlling depolarization and cell death within the screening material, facilitating the evaluation of compounds' actions on target ion channels with improved throughput and accuracy.
Implementation Method 1
supplying a K ion channel inhibitor to the screening material so as to inhibit the K ion channel
Implementation Method 2
a voltage-dependent Na ion channel that prolongs the duration of an action potential associated with depolarization
Implementation Method 3
an ion channel that contributes to deepening the resting membrane potential in the negative direction and/or that shortens the duration of an action potential associated with depolarization
Data Source
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AI summary
The screening system disclosed in the present specification is provided with a potential-dependent Na ion channel that extends the duration of the action potential associated with depolarization, and a K ion channel that deepens the resting membrane potential in the negative direction, said screening system furthermore including cells provided with ion channels that contribute to deepening the resting membrane potential in the negative direction and/or shortening the duration of the action potential as target ion channels. By such cells, the action of a test compound on the target ion channel can be easily evaluated by providing an inhibitor for the K ion channel to control the probability of cell death.