Isolation of Neurons from Caenorhabditis elegans via Fluorescence-Activated Cell Sorting
JoVE Encyclopedia of Experiments
Neuroscience
0 views • 2:10 min • July 8th, 2025
Take a suspension of cells obtained from transgenic Caenorhabditis elegans worms in a culture medium.
The suspension contains cells from various tissues, including neurons from the nervous system.
The transgenic worms were engineered to express a fluorescent protein conjugated to a vesicular transmembrane transporter. This transporter, present on synaptic vesicles carrying the neurotransmitter acetylcholine, is found in cholinergic neurons throughout the body.
Centrifuge the cell suspension and discard the supernatant. Resuspend the cells in a fresh culture medium for fluorescence-activated cell sorting, or FACS.
Analyze the cell suspension using FACS. The fluorescently labeled cholinergic neurons emit fluorescence upon exposure to light of an appropriate wavelength, separating them from other unlabeled cells.
Transfer the isolated neurons into a multi-well plate. Incubate the cells in a humidified chamber to maintain the moisture level.
Centrifuge cells from the isolated cell suspension at 10,000 times g and at 4 degrees Celsius for 5 minutes. Discard the supernatant and resuspend the pelleted cells in L-15-supplemented medium to a cell density of no more than 6 million cells per milliliter to avoid overloading the flow cytometer. Then, sort cells by GFP-positive expression using a flow cytometer capable of sorting samples.
GFP-negative cells can be used as a control for non-cell-type-specific analysis. After this, plate the isolated cells into the wells of a sterile six-well plate. Place the plate into a plastic container. Add a damp wipe or soft tissue paper to add moisture to the cells and incubate at 20 degrees Celsius.
Overview
This article describes a method for isolating cholinergic neurons from transgenic Caenorhabditis elegans using fluorescence-activated cell sorting (FACS). The transgenic worms express a fluorescent protein that allows for the identification and separation of these neurons from other cell types.
Key Study Components
Area of Science
- Neuroscience
- Cell Biology
- Genetics
Background
- Transgenic C. elegans are used to study neuronal function.
- Cholinergic neurons play a crucial role in neurotransmission.
- Fluorescent labeling aids in the identification of specific cell types.
- FACS is a powerful tool for cell sorting and analysis.
Purpose of Study
- To isolate cholinergic neurons for further study.
- To utilize FACS for the separation of fluorescently labeled cells.
- To provide a protocol for researchers working with C. elegans.
Methods Used
- Preparation of a cell suspension from transgenic C. elegans.
- Centrifugation to isolate cells from the culture medium.
- Fluorescence-activated cell sorting to identify and separate cholinergic neurons.
- Incubation of sorted cells in a controlled environment.
Main Results
- Successful isolation of GFP-positive cholinergic neurons.
- Demonstration of FACS efficacy in sorting neuronal cell types.
- Establishment of a reliable protocol for future experiments.
- Potential applications in studying neuronal function and behavior.
Conclusions
- The method effectively isolates specific neuronal populations.
- FACS is a valuable technique for cell biology research.
- This approach can enhance our understanding of cholinergic signaling.
Frequently Asked Questions
Executive Industry Relevance
Isolation of specific neuron populations from Caenorhabditis elegans using fluorescence-activated cell sorting (FACS) enables precise interrogation of neuronal function in a genetically tractable model. This capability supports early-stage target validation and mechanistic de-risking for neurobiology-focused discovery pipelines. The approach enhances predictive confidence in neuronal pathway studies relevant to CNS drug discovery portfolios.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Enables isolation of genetically defined cholinergic neurons for pathway-specific analysis.
- Supports mechanistic de-risking by providing pure neuronal populations for downstream assays.
- Facilitates functional target validation in a whole-organism context.
Screening & Assay Development
- Provides standardized, reproducible cell populations for assay development.
- Enables quantitative comparison of neuronal responses across experimental conditions.
- Supports development of scalable screening platforms using isolated neurons.
Translational & Preclinical Research
- Aligns with disease-relevant neurotransmitter systems for translational biomarker studies.
- Enables continuity from genetic model discovery to preclinical validation of neuronal targets.
- Supports risk-adjusted advancement of CNS-targeted programs.
Pipeline & Workflow Integration
This FACS-based neuron isolation method fits within the early discovery to lead identification continuum, providing a bridge between genetic model studies and functional screening workflows.
- Discovery Biology: Supports hypothesis testing and pathway clarification by isolating specific neuron types.
- Screening: Delivers reproducible, quantitative cell populations for assay readiness.
- Analytics: Enables measurement of fluorescence intensity and cell-type-specific outputs for comparative analysis.
- Translational Research: Facilitates alignment with disease-relevant neuronal pathways when supported by genetic models.
- Enterprise Reuse: Establishes a reusable workflow for isolating diverse neuronal subtypes in C. elegans.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence and reduces mechanistic ambiguity in neuronal studies.
- Operational Value: Standardizes neuron isolation for reproducibility and scalability across projects.
- Strategic Value: Improves go/no-go decisions by enabling robust target validation in early discovery.
- Portfolio Impact: Supports risk-adjusted prioritization of CNS and neurobiology programs.
Implementation Considerations
- Requires expertise in transgenic model generation and FACS operation.
- Needs access to flow cytometry instrumentation and cell culture infrastructure.
- Demands cross-team standardization of cell preparation and sorting protocols.
- Adaptation may be needed for different neuronal subtypes or genetic backgrounds.
- Cell density and temperature control are critical for optimal sorting and viability.
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Last updated: 22 August 2026