Characterization of Small Bowel Neuroendocrine Tumor Spheroids Using Immunofluorescence
JoVE Encyclopedia of Experiments
Neuroscience
0 views • 2:38 min • April 28th, 2025
Take small bowel neuroendocrine tumor spheroids in a tube.
Add a fixative solution to preserve the cells.
To wash, centrifuge, and replace the fixative with buffer.
Centrifuge and discard the supernatant to remove any remaining fixative.
Add a buffer containing detergent and a blocking agent to permeabilize the cellular membranes and prevent non-specific antibody binding.
Wash with buffer to remove excess detergent and blocking agent.
Incubate with primary antibodies, which bind to the target protein specific to the neuroendocrine cell.
Wash with buffer to remove unbound antibodies.
Add fluorophore-tagged secondary antibodies that bind to the primary antibodies.
Rinse with buffer to remove excess antibodies.
Add a mounting medium containing a dye to stain the nucleus.
Transfer the spheroids onto a slide and mount with a cover slip.
Use a Fluorescence microscope to visualize neuroendocrine cells of the spheroid expressing specific proteins.
Fix the organoids by adding 500 microliters of paraformaldehyde and incubating them for 15 minutes. After the incubation, wash the culture twice with 1 milliliter of PBS. Add 500 microliters of PBS with 3% BSA and 0.1% Triton X-100 to permeabilize the culture. Incubate the tube for five minutes, then wash the organoids three times with 1 milliliter of PBS and 3% BSA.
Next, incubate the culture with primary antibodies for one hour, then repeat the washes with PBS and BSA. Incubate with the secondary antibodies and repeat the washes, making sure to aspirate and discard all supernatant.
To image the spheroids, add 5 microliters of mounting medium containing DAPI, and use a P20 pipette to transfer 5 microliters of the spheroids to a glass slide. Seal the slide with a cover slip, and image with a fluorescence microscope using the 10, 20, and 40 times objectives.
Overview
This article describes a protocol for visualizing neuroendocrine cells in small bowel neuroendocrine tumor spheroids using fluorescence microscopy. The method involves fixation, permeabilization, and antibody staining to identify specific proteins.
Key Study Components
Area of Science
- Neuroscience
- Cell Biology
- Oncology
Background
- Neuroendocrine tumors can be challenging to study due to their complex biology.
- Fluorescence microscopy allows for detailed visualization of cellular components.
- Antibody staining is a common technique used to identify specific proteins in cells.
- Understanding the protein expression in these tumors can aid in developing targeted therapies.
Purpose of Study
- To establish a reliable method for visualizing neuroendocrine cells in spheroids.
- To enhance understanding of protein expression in small bowel neuroendocrine tumors.
- To provide a protocol that can be replicated in other studies.
Methods Used
- Fixation of spheroids using paraformaldehyde.
- Permeabilization with PBS containing BSA and Triton X-100.
- Incubation with primary and secondary antibodies for protein detection.
- Visualization using fluorescence microscopy with various objectives.
Main Results
- Successful visualization of neuroendocrine cells expressing specific proteins.
- Protocol demonstrated reproducibility and reliability.
- Fluorescence microscopy provided clear images of cellular structures.
- Antibody staining effectively highlighted target proteins in the spheroids.
Conclusions
- The established protocol is effective for studying neuroendocrine tumors.
- Fluorescence microscopy is a valuable tool for cellular analysis.
- Further studies can build on this method to explore therapeutic targets.
Frequently Asked Questions
Executive Industry Relevance
This immunofluorescence protocol enables visualization of neuroendocrine tumor spheroids, supporting target validation in oncology drug discovery. By confirming protein expression in 3D models, it enhances predictive confidence for mechanistic de-risking of therapeutic candidates. The method aids in prioritizing targets with disease-relevant biological relevance before lead identification.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Scientific Value: Interrogates therapeutic hypotheses by confirming target protein expression in neuroendocrine tumor models.
- Operational Value: Enables biological de-risking through direct visualization of biomarker expression in 3D spheroids.
- Scientific Value: Supports predictive confidence by validating target engagement in a disease-relevant system.
Screening & Assay Development
- Scientific Value: Prepares validated biological systems for downstream assay development using immunofluorescence readouts.
- Operational Value: Standardizes detection protocols to ensure reproducibility across compound screening campaigns.
- Scientific Value: Generates quantitative protein localization data to support assay optimization and hit validation.
Translational & Preclinical Research
- Scientific Value: Maintains disease relevance by modeling small bowel neuroendocrine tumor biology in 3D culture.
- Operational Value: Provides continuity from discovery through preclinical validation via consistent biomarker detection.
- Scientific Value: Enables risk-adjusted advancement decisions by linking target expression to phenotypic outcomes.
Pipeline & Workflow Integration
The method integrates into early discovery workflows to validate targets prior to lead identification and preclinical evaluation.
- Discovery Biology: Supports hypothesis testing by confirming protein expression in neuroendocrine tumor spheroids.
- Screening: Enables assay readiness through standardized, reproducible immunofluorescence staining.
- Analytics: Delivers quantitative readouts on protein localization and expression levels for comparative analysis.
- Translational Research: Connects discovery to preclinical work via biomarker alignment in disease-relevant models.
- Enterprise Reuse: Establishes a reusable immunofluorescence platform for multiple oncology targets across projects.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence by reducing mechanistic ambiguity in target validation.
- Operational Value: Enhances standardization and reproducibility of biomarker detection across teams.
- Strategic Value: Improves go/no-go decisions by providing objective protein expression data.
- Portfolio Impact: Enables risk-adjusted prioritization of targets based on validated disease relevance.
Implementation Considerations
- Requires expertise in immunofluorescence staining and fluorescence microscopy.
- Dependent on access to fixation, permeabilization, and antibody incubation infrastructure.
- Necessitates standardization of antibody concentrations and washing protocols across users.
- Requires adaptation for different target proteins and spheroid models.
- Limited by antibody availability and specificity for neuroendocrine markers.
Biopharma FAQs
Generation of High-Throughput Three-Dimensional Tumor Spheroids for Drug Screening
Related Videos
0 Views
Physiologic Patient Derived 3D Spheroids for Anti-neoplastic Drug Screening to Target Cancer Stem Cells
Related Videos
0 Views
Establishing 3-Dimensional Spheroids from Patient-Derived Tumor Samples and Evaluating their Sensitivity to Drugs
Related Videos
0 Views
Human Neuroendocrine Tumor Cell Lines as a Three-Dimensional Model for the Study of Human Neuroendocrine Tumor Therapy
Related Videos
0 Views
Immunofluorescent Staining of Spheroids: A Technique to Analyze Spheroids for Expression of Intra- and Extracellular Antigen Expression
Related Videos
0 Views
Splitting Spheroids for Sub-culturing and Shipping: A Procedure for Propagating and Transferring Spheroids from Small Bowel Neuroendocrine Tumor
Related Videos
0 Views
Longitudinal Morphological and Physiological Monitoring of Three-dimensional Tumor Spheroids Using Optical Coherence Tomography
Related Videos
0 Views
A 3D Spheroid Model as a More Physiological System for Cancer-Associated Fibroblasts Differentiation and Invasion In Vitro Studies
Related Videos
0 Views
Characterization of the Effects of Migrastatic Inhibitors on 3D Tumor Spheroid Invasion by High-resolution Confocal Microscopy
Related Videos
0 Views
Establishment and Characterization of Small Bowel Neuroendocrine Tumor Spheroids
Related Videos
0 Views
Last updated: 29 August 2026