Evidence for a novel function of the CD40 ligand as a signalling molecule in T-lymphocytes

The interaction of the CD40 receptor with its ligand has been shown to be crucial for the activation of B-lymphocytes. Here, we provide evidence that the pg39 molecule/CD40 ligand (gp39/CD40L) also functions as a stimulatory molecule for T-lymphocytes. Activation of T-lymphocytes via gp39/CD40L indu...

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Veröffentlicht in:FEBS letters 1997-11, Vol.417 (3), p.301-306
Hauptverfasser: Brenner, Birgit, Koppenhoefer, Ursula, Grassmé, Heike, Kun, Jutta, Lang, Florian, Gulbins, Erich
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container_end_page 306
container_issue 3
container_start_page 301
container_title FEBS letters
container_volume 417
creator Brenner, Birgit
Koppenhoefer, Ursula
Grassmé, Heike
Kun, Jutta
Lang, Florian
Gulbins, Erich
description The interaction of the CD40 receptor with its ligand has been shown to be crucial for the activation of B-lymphocytes. Here, we provide evidence that the pg39 molecule/CD40 ligand (gp39/CD40L) also functions as a stimulatory molecule for T-lymphocytes. Activation of T-lymphocytes via gp39/CD40L induced a strong activation of Jun-N-terminal kinase (JNK) and p38-K. Activation of these kinases correlates with a stimulation of Rac1 and inhibition of Rac1 prevents gp39/CD40L triggered JNK/p38-K activation. Further, cellular stimulation via the CD40 ligand results in tyrosine phosphorylation of cellular proteins and the activation of p56 lck. Inhibition of src-like kinases inhibits Rac1 as well as JNK/p38-K stimulation suggesting a signalling cascade from the gp39/CD40L via p56 lck and Rac1 to JNK/p38-K.
doi_str_mv 10.1016/S0014-5793(97)01306-9
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subjects Animals
Antigens, CD - physiology
Calcium-Calmodulin-Dependent Protein Kinases - metabolism
CD40 Antigens - physiology
CD40 Ligand
gp39
Humans
JNK Mitogen-Activated Protein Kinases
Jun-N-terminal kinase
Jurkat Cells
Lymphocyte Activation
Lymphocyte Specific Protein Tyrosine Kinase p56(lck) - metabolism
Membrane Glycoproteins - physiology
Mice
Mitogen-Activated Protein Kinases
p38 Mitogen-Activated Protein Kinases
Recombinant Proteins - metabolism
Signal Transduction
Spleen - enzymology
T-lymphocytes
T-Lymphocytes - immunology
T-Lymphocytes - physiology
Transfection
Tyrosine kinase
title Evidence for a novel function of the CD40 ligand as a signalling molecule in T-lymphocytes
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