Related Experiment Videos
Differential gene expression by integrin beta 7+ and beta 7- memory T helper cells
Madeleine W Rodriguez1, Agnés C Paquet, Yee Hwa Yang
1Department of Medicine, University of California, San Francisco, CA 94143-0854, USA. mwillkorn@yahoo.com
BMC Immunology
|July 9, 2004
Summary
Blood T helper cells expressing integrin alpha 4 beta 7 (β7) show distinct gene expression patterns compared to β7- cells. This finding impacts understanding T cell migration and homing behaviors.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- Integrin alpha 4 beta 7 (β7) is a cell adhesion molecule crucial for lymphocyte homing to the gut.
- Distinct gene expression profiles may exist between β7-positive and β7-negative memory T helper cells.
Purpose of the Study:
- To investigate differential gene expression between β7+ and β7- blood memory T helper cells.
- To identify genes involved in adhesion and migration that are uniquely expressed in these T cell subsets.
Main Methods:
- Oligonucleotide microarrays were used to analyze RNA from purified β7+ and β7- CD4+ CD45RA- blood T cells.
- Differential gene expression was assessed based on fold change and statistical significance (adjusted P < 0.05).
- Flow cytometry confirmed differential surface protein expression for selected genes.
Main Results:
- Out of 21,357 genes, 16 were upregulated in β7+ cells and 18 in β7- cells (≥1.5 fold difference).
- Key differentially expressed genes include chemokine receptors (CCR9, CCR10), integrin alpha 4, L-selectin, KLRB1, NT5E, galectins (LGALS1, LGALS2), and RGS1.
- Surface expression of KLRB1, LAIR1, and NT5E proteins was higher on β7+ memory/effector T cells.
Conclusions:
- Memory/effector T cells expressing integrin β7 exhibit a unique gene transcript profile.
- These differentially expressed molecules likely modulate T cell adhesion, chemotaxis, and homing behaviors.
- Understanding these differences is key to regulating CD4+ memory T cell subset trafficking.