CCR7 Ligands Control Basal T Cell Motility Within Lymph Node Slices in a Phosphoinositide 3-kinase-independent Manner

Overview

Journal J Exp Med

Specialties Allergy & Immunology
General Medicine

Date 2007 May 9

PMID 17485513

Citations 80

Authors

Francois Asperti-Boursin

Eliana Real

Georges Bismuth

Alain Trautmann

Emmanuel Donnadieu

Affiliations

Soon will be listed here.

Abstract

The molecular mechanisms responsible for the sustained basal motility of T cells within lymph nodes (LNs) remain elusive. To study T cell motility in a LN environment, we have developed a new experimental system based on slices of LNs that allows the assessment of T cell trafficking after adoptive transfer or direct addition of T cells to the slice. Using this experimental system, we show that T cell motility is highly sensitive to pertussis toxin and strongly depends on CCR7 and its ligands. Our results also demonstrate that, despite its established role in myeloid cell locomotion, phosphoinositide 3-kinase (PI3K) activity does not contribute to the exploratory behavior of the T lymphocytes within LN slices. Likewise, although PI3K activation is detectable in chemokine-treated T cells, PI3K plays only a minor role in T cell polarization and migration in vitro. Collectively, our results suggest that the common amplification system that, in other cells, facilitates large phosphatidylinositol 3,4,5-trisphosphate increases at the plasma membrane is absent in T cells. We conclude that T cell motility within LNs is not an intrinsic property of T lymphocytes but is driven in a PI3K-independent manner by the lymphoid chemokine-rich environment.

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