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

Kassahn, D; Nachbur, U; Conus, S; Micheau, O; Schneider, P; Simon, H-U; Brunner, T (2009). Distinct requirements for activation-induced cell surface expression of preformed Fas/CD95 ligand and cytolytic granule markers in T cells. Cell death and differentiation, 16(1), pp. 115-24. Basingstoke: Nature Publishing Group 10.1038/cdd.2008.133

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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.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Service Sector > Institute of Pathology 04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Pharmacology
UniBE Contributor:	Kassahn, Daniela, Nachbur, Ulrich, Simon, Hans-Uwe, Brunner, Thomas (A)
ISSN:	1350-9047
ISBN:	19079288
Publisher:	Nature Publishing Group
Language:	English
Submitter:	Factscience Import
Date Deposited:	04 Oct 2013 15:08
Last Modified:	29 Mar 2023 23:33
Publisher DOI:	10.1038/cdd.2008.133
PubMed ID:	19079288
Web of Science ID:	000261693600014
URI:	https://boris.unibe.ch/id/eprint/30002 (FactScience: 165653)