Abstract
In the present study we demonstrated that CD95L cross-linking generated reverse signalling in the mouse derived Sertoli cell line TM4. Treatment of TM4 cells with mAb anti-CD95L induced activation of the cytosolic phospholipase A2 (cPLA2). Cytosolic PLA2 activation was controlled by the MAPK pathway as indicated by the ability of the specific MEK inhibitor, PD098059, to abolish cPLA2 activation. In addition, Western blot experiments showed a rapid increase in phosphorylated Erk1/2 following CD95L cross-linking, while no effect on the phosphorylation of other MAPK, p38 or JNK, was observed. CD95L cross-linking by mAb increased the levels of soluble CD95L and apoptotic activity of TM4 cell supernatants, which was blocked by co-incubation with the PLA2 inhibitor, AACOCF3 or PD098059. Finally, pre-treatment of TM4 cells with AACOCF3 or PD098059 completely abolished TM4-induced apoptosis of Jurkat T cells, thus indicating that the Erk/cPLA2 pathway is required for CD95L-induced apoptosis. Cell Death and Differentiation (2000) 7, 916–924
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Abbreviations
- CD95L:
-
CD95 ligand
- PLA2:
-
phospholipase A2
- MAPK:
-
mitogen activated protein kinase
- MEK:
-
MAPK kinase
- Erk:
-
extracellular signal-regulated kinase
- JNK:
-
c-Jun N-terminal kinase
- DAG:
-
diacylglycerol
- TNF:
-
tumour necrosis factor
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This work was supported by the Ministero dell'Università e della Ricerca Scientifica e Tecnologica grants (MURST 60%).
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Ulisse, S., Cinque, B., Silvano, G. et al. Erk-dependent cytosolic phospholipase A2 activity is induced by CD95 ligand cross-linking in the mouse derived Sertoli cell line TM4 and is required to trigger apoptosis in CD95 bearing cells. Cell Death Differ 7, 916–924 (2000). https://doi.org/10.1038/sj.cdd.4400716
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DOI: https://doi.org/10.1038/sj.cdd.4400716
