In Vitro and In Vivo Approaches to Determine Intestinal Epithelial Cell Permeability
October 19th, 2018
Two methods are presented here to determine intestinal barrier function. An epithelial meter (volt/ohm) is used for measurements of transepithelial electrical resistance of cultured epithelia directly in tissue culture wells. In mice, the FITC-dextran gavage method is used to determine the intestinal permeability in vivo.
Overview
This article presents two methods to assess intestinal barrier function, focusing on epithelial cell permeability. The techniques include in vitro measurements using an epithelial meter and in vivo assessments through the FITC-dextran gavage method in mice.
Key Study Components
Area of Science
- Neuroscience
- Gastroenterology
- Cell Biology
Background
- Epithelial barrier dysfunction is linked to various gastrointestinal diseases.
- Understanding intestinal permeability is crucial for studying conditions like inflammatory bowel disease.
- The methods described can also be applied to other research areas, such as drug toxicity.
- Visual demonstrations enhance learning of complex techniques.
Purpose of Study
- To measure intestinal epithelial cell permeability in vitro and in vivo.
- To investigate the role of epithelial barrier dysfunction in gastrointestinal diseases.
- To provide insights that may aid in therapy or diagnosis.
Methods Used
- Measurement of transepithelial electrical resistance using an epithelial meter.
- FITC-dextran gavage method for in vivo permeability assessment in mice.
- Visual demonstrations to facilitate understanding of the techniques.
- Application of methods to other systems beyond intestinal studies.
Main Results
- Successful measurement of intestinal barrier function using both methods.
- Insights into the relationship between epithelial permeability and gastrointestinal diseases.
- Demonstrated applicability of techniques to drug toxicity studies.
- Visual aids improved comprehension of complex experimental steps.
Conclusions
- The methods provide valuable tools for studying epithelial barrier function.
- Understanding permeability can lead to better therapeutic strategies for gastrointestinal diseases.
- These techniques have broader implications for various biomedical research areas.
Frequently Asked Questions
Executive Industry Relevance
Quantitative assessment of intestinal epithelial permeability is critical for de-risking early discovery programs targeting barrier function and for evaluating disease-relevant mechanisms in gastrointestinal research. The integration of in vitro TER measurements and in vivo FITC-dextran assays enables predictive confidence in model selection and supports translational continuity from cell-based systems to animal models. These approaches underpin portfolio decisions in therapeutic areas where barrier integrity is a key mechanistic inflection point.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Enables interrogation of barrier function hypotheses in disease-relevant systems.
- Supports mechanistic de-risking by quantifying tight junction integrity and epithelial response to cytokines.
- Facilitates functional target validation for pathways implicated in barrier dysfunction.
- Provides quantitative endpoints for triaging candidate targets in gastrointestinal disease portfolios.
Screening & Assay Development
- Delivers standardized, reproducible TER and permeability readouts for assay development.
- Prepares validated Caco-2BBe monolayers for downstream compound screening workflows.
- Enables scalability and platform reuse across multiple barrier integrity studies.
- Supports reliable evaluation of compound effects on epithelial permeability.
Translational & Preclinical Research
- Aligns in vitro and in vivo permeability data for translational biomarker development.
- Provides continuity from cell-based assays to preclinical mouse models of colitis.
- Informs risk-adjusted advancement decisions by linking barrier dysfunction to disease phenotypes.
- Strengthens predictive value for therapeutic modulation of epithelial integrity.
Pipeline & Workflow Integration
These methods position intestinal permeability assessment at the intersection of early discovery, lead identification, and preclinical validation in gastrointestinal research pipelines.
- Discovery Biology: Supports hypothesis testing on barrier function and cytokine-mediated disruption.
- Screening: Provides reproducible, quantitative TER and FITC-dextran outputs for assay readiness.
- Analytics: Enables statistical comparison of permeability across experimental conditions and models.
- Translational Research: Bridges in vitro findings with in vivo disease models for biomarker alignment.
- Enterprise Reuse: Establishes a reusable platform for barrier integrity studies across therapeutic programs.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence and reduces mechanistic ambiguity in barrier function studies.
- Operational Value: Standardizes permeability measurement and enhances reproducibility across teams.
- Strategic Value: Improves go/no-go decisions and capital allocation by providing robust functional readouts.
- Portfolio Impact: Enables risk-adjusted prioritization of targets and models in gastrointestinal disease pipelines.
Implementation Considerations
- Requires expertise in cell culture, animal handling, and quantitative assay operation.
- Demands access to epithelial meters, fluorescence plate readers, and histopathology infrastructure.
- Necessitates cross-team standardization of protocols and data analysis methods.
- Adaptable to other epithelial and barrier models with appropriate validation.
- Operational limitations include the need for rigorous statistical analysis and error minimization.
Biopharma FAQs
Chapters in this video
0:04
Title
1:18
Plating and Maintenance of Caco-2bbe on Porous Polycarbonate Membranes
2:53
Use of Epithelial Meter for Measuring Transepithelial Electrical Resistance
4:39
Murine Model of Dextran Sulfate Sodium (DSS)-induced Colitis
6:07
Measuring the Epithelial Barrier Permeability in DSS-induced Colitis Mice
8:01
Results: Measure of Permeability of Intestinal Epithelial Cells
9:29
Conclusion
