Stable hERG-Expressing Eukaryotic Cell Lines for High Throughput Screening
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Solution Overview
Problem
High throughput screening of drug candidates to determine their effect on the hERG potassium channel has been difficult due to the unavailability of stable cell lines that express hERG at sufficient surface concentrations suitable for high throughput ion flow measurement instruments.
Innovation Solution
Development of stable eukaryotic cell lines that express hERG, capable of forming reproducible seals with large current amplitudes using standard and automated patch clamp setups, allowing for the determination of a compound's propensity to inhibit hERG conductance activity by measuring test currents under electrophysiological conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If stable cell lines expressing hERG are developed, then high throughput screening capability is improved, but cell line stability and current consistency must be maintained
Solution Approach 1:
The patent modifies cell line parameters through selective breeding and controlled laboratory conditions to achieve both high throughput capability and current consistency. The cell lines are engineered to express hERG channels at sufficient surface concentrations while maintaining stable current amplitudes with less than 20% variation over one hour, resolving the contradiction between productivity and reliability.
2Quantity of substance
If hERG expression surface concentration is increased, then current amplitude is improved, but cell line stability deteriorates
Solution Approach 1:
The patent performs preliminary selection and stabilization of cell lines with high hERG expression before they are used for high throughput screening. Through controlled laboratory conditions and selective breeding, cell lines are pre-conditioned to maintain high surface concentrations of hERG channels while achieving stability in current amplitude over time, thus resolving the contradiction between quantity and stability.
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
The cell lines provide consistent hERG current measurements with less than 20% variation over one hour, enabling efficient high throughput screening of drug candidates for their interaction with the hERG channel, thereby assessing potential cardiotoxicity.
Implementation Method 1
The voltage-gated hERG potassium channel contributes to the rapidly-activating delayed rectifier potassium current (IKr) of the cardiac action potential
Implementation Method 2
using standard and automated patch clamp set ups
Data Source
AI summary
A stable eukaryotic cell line that expresses hERG and exhibits a stable current under electrophysiological test conditions is provided.