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Updated: Aug 9, 2026
Isolating Lymphocytes from the Mouse Small Intestinal Immune System
Published on: February 28, 2018
Phenotypic heterogeneity of intraepithelial T lymphocytes from mouse small intestine
K J Maloy1, A M Mowat, R Zamoyska
1Department of Bacteriology and Immunology, Western Infirmary, Glasgow, U.K.
Insights
Intraepithelial lymphocytes (IEL) in the mouse small intestine exhibit significant heterogeneity. Researchers identified distinct CD8+ T cell populations, including unconventional alpha beta T-cell receptor (TcR)+ and gamma delta TcR+ IEL, highlighting the complexity of intestinal immunity.
Area of Science:
- Immunology
- Gastroenterology
- Cell Biology
Background:
- Intraepithelial lymphocytes (IEL) are crucial immune cells residing in the gut epithelium.
- Understanding IEL heterogeneity is vital for comprehending intestinal immune responses.
- Previous studies suggest diverse IEL populations with distinct functions.
Purpose of the Study:
- To investigate the heterogeneity of intraepithelial lymphocytes (IEL) in the mouse small intestine.
- To characterize distinct subsets of CD8+ IEL based on T-cell receptor (TcR) and CD8 co-receptor expression.
- To analyze the developmental changes in IEL populations with age.
Main Methods:
- Two-colour flow cytometry was employed to analyze IEL phenotypes.
- Simultaneous detection of CD8 alpha/beta chains and alpha beta T-cell receptor (TcR) expression.
- Analysis of CD45RB expression on CD4+ and CD8+ IEL compared to peripheral T cells.
Main Results:
- Predominance of CD3+ Thy 1- CD8+ IEL confirmed.
- Identification of three distinct CD8+ IEL populations: conventional CD8+ alpha beta TcR+, gamma delta TcR+ (TcR-), and a unique alpha beta TcR+ CD8 beta- subset.
- Gamma delta + IEL were more prevalent in young mice (<8 weeks), while alpha beta TcR+ CD8+ IEL increased with age.
- CD8+ IEL showed high CD45RB expression, similar to peripheral CD8+ T cells.
- CD4+ IEL exhibited lower CD45RB expression than peripheral CD4+ T cells.
Conclusions:
- Mouse small intestinal IEL display significant heterogeneity, particularly within the CD8+ T cell compartment.
- Distinct populations of alpha beta TcR+ and gamma delta TcR+ IEL exist, with age-dependent prevalence.
- These findings underscore the necessity of studying phenotypically defined IEL populations for accurate immunological interpretation.
Abstract:
We have used two-colour flow cytometry to examine the heterogeneity of intraepithelial lymphocytes (IEL) from mouse small intestine. We have confirmed the predominance of CD3+ Thy 1- CD8+ IEL and show that a substantial but variable proportion of CD8+ IEL does not express the alpha beta T-cell receptor (TcR) for antigen. Simultaneous analysis of the co-expression of the alpha and beta chains of the CD8 heterodimer and of the alpha beta TcR revealed three populations of CD8+IEL. The first of these expressed both CD8 alpha and beta chains and had normal expression of V beta families and so represented conventional CD8+ alpha beta TcR+ T cells. The second population comprised alpha beta TcR- T cells (presumed gamma delta TcR+) which expressed only the alpha chain of the CD8 molecule. Finally, we identified a second, unique population of alpha beta TcR+ CD8+ IEL which were also CD8 beta-. Gamma delta + IEL predominated in mice aged less than 8 weeks, but there was a rapid increase in both populations of alpha beta TcR+ CD8+ IEL in older mice. CD8+ IEL were similar to peripheral CD8+ T cells in having high expression of the CD45RB molecule, but CD4+ IEL had generally lower expression of CD45RB than their peripheral counterparts, despite having normal expression of TcR. These findings emphasize the heterogeneity of IEL and underline the need to study phenotypically defined populations.
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