Stable ENaC Cell Lines for High-Throughput Modulator Screening
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Solution Overview
Problem
The lack of robust, physiologically relevant cell-based systems for identifying and testing modulators of epithelial sodium channels (ENaC) has hindered the discovery of new therapeutics for diseases related to ion conductance, as existing systems are cytotoxic and not amenable to high-throughput formats.
Innovation Solution
Engineered mammalian cell lines stably expressing ENaC alpha, beta, and gamma subunits, achieved through vector introduction and molecular beacon detection, allowing for stable expression and functional assays without antibiotics, and enabling the identification of modulators using membrane potential dye assays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ENaC is expressed in cell-based systems, then functional assays for ENaC modulators can be performed, but the expression is cytotoxic
Solution Approach 1:
The patent changes the ionic composition parameters of the culture medium, specifically reducing sodium concentration to 90mM and adjusting other ions, which allows ENaC expression without cytotoxicity by controlling the electrochemical gradient across the membrane
Solution Approach 2:
The patent uses molecular beacons as intermediary detection tools that enable high-throughput screening of ENaC modulators through fluorescence signals, making the cytotoxic system amenable to automated testing
2Reliability
If cell-based systems are used for ENaC modulator discovery, then functional assays are enabled, but high-throughput format is not achieved
Solution Approach 1:
The patent introduces molecular beacons as intermediary detection tools that enable high-throughput screening through fluorescence-activated cell sorting and automated detection, transforming the functional assay into a high-throughput format
Solution Approach 2:
The patent replaces manual or low-throughput functional assays with automated fluorescence detection and flow cytometry-based sorting, enabling high-throughput screening of ENaC modulators
3Ease of manufacture
If transient expression systems are used, then setup is simple, but expression stability and reproducibility are poor
Solution Approach 1:
The patent performs preliminary stable transfection of ENaC subunit genes into cell lines before conducting modulator screening, ensuring consistent and reproducible expression levels across experimental batches
Solution Approach 2:
The patent creates universal cell line platforms with stably integrated ENaC expression systems that can be used across multiple experiments and laboratories, enabling reproducible high-throughput screening
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 solution provides stable and reproducible cell lines that can identify ENaC modulators effectively, overcoming cytotoxicity issues and enabling high-throughput screening, with enhanced sensitivity and physiological relevance, facilitating the development of therapeutics for diseases like hypertension and cystic fibrosis.
Implementation Method 1
introducing a first molecular beacon that detects the expression of the ENaC alpha or delta subunit, a second molecular beacon that detects the expression of the ENaC beta subunit and a third molecular beacon that detects the expression of the ENaC gamma subunit
Implementation Method 2
a membrane potential dye assay using the cells or cell lines of the invention and NaCl as an agonist has a Z' value of at least 0.8
Data Source
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Figure 3A~3C
AI summary
Cell lines that stably express ENaC and methods for using those cell lines are disclosed herein. The invention includes cell lines that express various subunit combinations and various proteolyzed isoforms of ENaC and techniques for creating cell lines. The ENaC-expressing cell lines are highly sensitive, physiologically relevant and produce consistent results.