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Updated: May 23, 2025
Isolation and Flow Cytometric Characterization of Murine Small Intestinal Lymphocytes
Published on: May 8, 2016
Standardized Flow Cytometry Method for Absolute Counting of Intraepithelial Lymphocytes in the Intestinal Mucosa
Corentin Joulain1, Stéphanie Bessoles1, Andrada S Chiron1,2
1Université Paris Cité, CNRS, INSERM, UTCBS, Unité des technologies Chimiques et Biologiques pour la Santé, Paris, France.
Insights
This study introduces a flow cytometry method to accurately count intraepithelial lymphocytes (IELs) and intestinal epithelial cells (IECs), improving disease research. This technique enhances the reliability of IEL counts for digestive disease studies.
Area of Science:
- Immunology
- Gastroenterology
- Cell Biology
Background:
- Intraepithelial lymphocytes (IELs) are crucial for intestinal immunity and tumor surveillance.
- Anomalies in IEL counts are linked to various digestive diseases.
- Current IEL counting methods (histology, microscopy) are prone to bias and discrepancies.
Purpose of the Study:
- To develop and validate a flow cytometry assay for precise absolute quantification of IELs and intestinal epithelial cells (IECs).
- To establish a reliable method for determining the IEL/IEC ratio.
- To overcome limitations of conventional counting techniques and improve reproducibility in IEL research.
Main Methods:
- Combined a standard epithelial isolation technique with BD TruCount™ bead-based absolute counting.
- Utilized flow cytometry to quantify specific IEL (CD45+ CD326/EpCAM- CD103+CD3+) and IEC (CD45- CD326/EpCAM+) populations.
- Applied the method to a C57BL/6 mouse model.
Main Results:
- Successfully quantified absolute IEL counts and the IEL/IEC ratio using flow cytometry.
- Demonstrated the assay's ability to provide reproducible and standardized cell counts.
- Established a quantitative method for IEL and IEC assessment.
Conclusions:
- Flow cytometry with absolute counting beads offers a standardized and reproducible method for determining IEL and IEC counts and ratios.
- This assay addresses the limitations of traditional methods, enabling more reliable comparisons across studies.
- The developed technique is valuable for research in digestive diseases and mucosal immunology.
Abstract:
In the intestinal epithelium, intraepithelial lymphocytes (IELs) coexist with intestinal epithelial cells (IECs). The IELs have an important role in defending the intestinal tract against pathogens and eliminating tumor cells. Anomalies in the absolute IEL count have been reported in various digestive diseases. IELs are typically counted using histologic techniques or under light microscopy after isolation of the epithelium. However, these techniques can introduce bias, which might account for the discrepancies in counts from one study to another. Here, we describe a flow cytometry assay for determining the absolute IEL count and the IEL/IEC ratio. We combined a conventional epithelial isolation method with a BD TruCountTM bead-based absolute counting technique to quantify IELs (CD45+ CD326/EpCAM- CD103+CD3+) and IECs (CD45- CD326/EpCAM+) in a C57BL/6 mouse model. Key features • Intraepithelial lymphocytes (IELs) play a crucial role in maintaining mucosal integrity and defending against pathogens. • Conventional manual counting of IELs using a hemocytometer relies heavily on the operator's expertise. • Flow cytometry offers a more standardized approach to cell counting. • Using TruCountTM beads to quantify IELs and intraepithelial cells (IECs) by flow cytometry and assess their ratio ensures reproducibility and comparison with immunohistochemical methods. Graphical Overview.
