Stable Mammalian Cell Lines Expressing Nematode ACR-16 Receptors
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Solution Overview
Problem
The increasing resistance of parasitic nematodes to commercial anthelmintics, such as levamisole and macrocyclic lactones, necessitates the development of new anthelmintics with novel modes of action to effectively treat gastrointestinal parasitic infections in ruminants and heartworm disease in animals.
Innovation Solution
Stable mammalian cell lines are created that express functional nematode acetylcholine receptors (ACR-16) and resistance to inhibitors of cholinesterase 3 (RIC3) proteins, enabling high-throughput screening for modulators of these channels, which could serve as novel anthelmintic agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If stable mammalian cell lines expressing functional nematode ACR-16 receptors are developed, then high-throughput screening capability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent segments the complex problem of creating functional nematode AChR expression systems by dividing it into manageable components: selecting specific mammalian cell lines (HEK 293, CHO, COS-7), identifying necessary co-expressed proteins (RIC-3, alpha-bungarotoxin), and establishing standardized transfection protocols. This segmentation enables systematic optimization of each component for high-throughput screening.
Solution Approach 2:
The patent establishes universal mammalian cell line platforms that can express multiple different nematode ACR-16 receptor variants. The same cell line infrastructure (with RIC-3 co-expression) supports screening for various anthelmintic compounds against different nematode species, creating a multi-functional screening system that reduces overall complexity.
2Reliability
If novel anthelmintic compounds are identified through screening, then effectiveness against resistant parasites is improved, but development time and resource investment increase
Solution Approach 1:
The patent performs preliminary actions by pre-establishing validated stable cell lines with confirmed ACR-16 expression and functional characterization. These pre-ready screening platforms eliminate the need to develop expression systems from scratch for each new compound screen, significantly reducing development time while maintaining reliability through prior validation.
Solution Approach 2:
The patent implements feedback mechanisms through standardized assay protocols that provide quantitative measurements of compound efficacy against ACR-16 expressing cell lines. This feedback enables rapid iteration and optimization of compound candidates, accelerating the identification of effective anthelmintics while maintaining rigorous effectiveness criteria.
3Measurement precision
If functional ACR-16 expression is achieved in mammalian cells, then screening accuracy is improved, but expression stability and functionality deteriorate without proper co-factors
Solution Approach 1:
The patent introduces RIC-3 protein as an essential intermediary that mediates between the transfected ACR-16 receptor gene and functional surface expression. RIC-3 acts as a chaperone that stabilizes the heterologous receptor during trafficking and assembly, ensuring both expression stability and functional accuracy for reliable screening measurements.
Solution Approach 2:
The patent optimizes multiple parameters simultaneously to achieve stable functional expression: selecting cell lines with appropriate membrane composition, optimizing transfection conditions, adjusting RIC-3 to ACR-16 expression ratios, and controlling incubation conditions. These parameter optimizations work together to maintain both stability and screening accuracy.
Data Source
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AI summary
The following discloses mammalian cells lines that stably express functional nematode acetylcholine receptor subunits. The resulting expression of functional ion channels has been made possible by the stable co-expression of the chaperone protein, RIC3. These cell lines are extremely useful for the high throughput screening (HTS) of compounds, to identify new candidate parasiticidal, including nematocidal, active ingredients.