P2X7 Receptor Expression Levels Determine Lethal Effects of a Purine Based Danger Signal in T Lymphocytes

Overview

Journal Cell Immunol

Publisher Elsevier

Specialties Allergy & Immunology
Cell Biology

Date 2007 Feb 9

PMID 17286969

Citations 30

Authors

Fred Aswad

Gunther Dennert

Affiliations

Soon will be listed here.

Abstract

Contact of T lymphocytes with nicotinamide adenine dinucleotide (NAD) or ATP causes cell death that requires expression of purinergic receptor P2X(7) (P2X(7)R). T cell subsets differ in their responses to NAD and ATP, which awaits a mechanistic explanation. Here, we show that sensitivity to ATP correlates with P2X(7)R expression levels in CD4 cells, CD8 cells and CD4(+)CD25(+) cells from both C57BL/6 and BALB/c mice. But P2X(7)R ligands do not only induce cell death but also shedding of CD62L. It is shown here that in CD62L(high) T cells, CD62L shedding correlates with low expression of P2X(7)Rs and lower cell death, whereas in CD62L(low) cells P2X(7)R expression and death are higher. The possibility is therefore investigated that P2X(7)Rs induce T cell activation. Experiments show that spontaneous T cell proliferation is somewhat higher in cells expressing P2X(7)Rs, but this effect we suggest is caused by P2X(7)R expression on accessory cells.

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