Distinct requirements for activation-induced cell surface expression of preformed Fas/CD95 ligand and cytolytic granule markers in T cells.

Détails

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Etat: Supprimée
Version: de l'auteur⸱e
ID Serval
serval:BIB_BA0E3AC99550
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Distinct requirements for activation-induced cell surface expression of preformed Fas/CD95 ligand and cytolytic granule markers in T cells.
Périodique
Cell Death and Differentiation
Auteur⸱e⸱s
Kassahn D., Nachbur U., Conus S., Micheau O., Schneider P., Simon H.U., Brunner T.
ISSN
1476-5403
Statut éditorial
Publié
Date de publication
01/2009
Peer-reviewed
Oui
Volume
16
Numéro
1
Pages
115-124
Langue
anglais
Résumé
Fas (CD95/Apo-1) ligand is a potent inducer of apoptosis and one of the major killing effector mechanisms of cytotoxic T cells. Thus, Fas ligand activity has to be tightly regulated, involving various transcriptional and post-transcriptional processes. For example, preformed Fas ligand is stored in secretory lysosomes of activated T cells, and rapidly released by degranulation upon reactivation. In this study, we analyzed the minimal requirements for activation-induced degranulation of Fas ligand. T cell receptor activation can be mimicked by calcium ionophore and phorbol ester. Unexpectedly, we found that stimulation with phorbol ester alone is sufficient to trigger Fas ligand release, whereas calcium ionophore is neither sufficient nor necessary. The relevance of this process was confirmed in primary CD4(+) and CD8(+) T cells and NK cells. Although the activation of protein kinase(s) was absolutely required for Fas ligand degranulation, protein kinase C or A were not involved. Previous reports have shown that preformed Fas ligand co-localizes with other markers of cytolytic granules. We found, however, that the activation-induced degranulation of Fas ligand has distinct requirements and involves different mechanisms than those of the granule markers CD63 and CD107a/Lamp-1. We conclude that activation-induced degranulation of Fas ligand in cytotoxic lymphocytes is differently regulated than other classical cytotoxic granule proteins.
Mots-clé
Animals, Antigens, CD, Apoptosis, CD4-Positive T-Lymphocytes, CD8-Positive T-Lymphocytes, Cell Degranulation, Enzyme Activation, Fas Ligand Protein, Gene Expression Regulation, Humans, Ionophores, Jurkat Cells, Killer Cells, Natural, Lymphocyte Activation, Lysosome-Associated Membrane Glycoproteins, Membrane Glycoproteins, Mice, Phorbol Esters, Protein Kinases, Secretory Vesicles, Transcription, Genetic
Pubmed
Web of science
Open Access
Oui
Création de la notice
13/02/2009 20:10
Dernière modification de la notice
20/08/2019 15:28
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