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Updated: Feb 9, 2026
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On-Chip Endothelial Inflammatory Phenotyping
Published on: July 21, 2012
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Circulating integrin alpha4/beta7+ lymphocytes targeted by vedolizumab have a pro-inflammatory phenotype
James D Lord1, S Alice Long2, Donna M Shows2
1Benaroya Research Institute, Translational Research Program, United States..
Clinical Immunology (Orlando, Fla.)
|May 30, 2018
Summary
Vedolizumab targets gut-tropic lymphocytes expressing alpha4/beta7 integrin. This therapy may selectively replace pro-inflammatory cells with regulatory T cells, promoting immune tolerance in the gut mucosa.
Area of Science:
- Immunology
- Gastroenterology
Background:
- Integrin alpha4/beta7 identifies gut-tropic lymphocytes and is a target for vedolizumab therapy in inflammatory bowel disease (IBD).
- Understanding the functional characteristics of alpha4/beta7+ lymphocytes is crucial for optimizing IBD treatment.
Purpose of the Study:
- To investigate the functional properties and subset distribution of alpha4/beta7-expressing lymphocytes.
- To elucidate the impact of vedolizumab's target on immune cell populations within the gut.
Main Methods:
- Flow cytometry analysis of alpha4/beta7 expression on T cell subsets.
- Assessment of cytokine responsiveness in alpha4/beta7+ lymphocytes.
Main Results:
- Lymphocytes expressing alpha4/beta7 showed increased responsiveness to pro-inflammatory cytokines (IL-6, IL-7, IL-21) and decreased responsiveness to IL-2.
- Alpha4/beta7 was less prevalent on thymically-derived regulatory T cells (tTregs) compared to peripherally-derived Tregs (pTregs) and effector T cells.
- Alpha4/beta7+ CD4 T cells were infrequent among Th2 cells (CRTh2+) but enriched in circulating T follicular helper cells (CXCR5+).
Conclusions:
- The therapeutic effect of vedolizumab may be qualitative, involving the selective replacement of pro-inflammatory cells with regulatory and Th2 cells.
- This mechanism could promote immune tolerance in the mucosa without causing global lymphocyte depletion.
- Vedolizumab's action may rebalance the mucosal immune environment in IBD.
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