CD95 ligand: lethal weapon against malignant glioma?

Brain Pathology
M WellerH Ohgaki

Abstract

CD95 (Fas/APO-1) and its ligand (CD95L) belong to a growing cytokine and cytokine receptor family that includes nerve growth factor (NGF) and tumor necrosis factor (TNF) and their corresponding receptors. CD95 expression increases during malignant progression from low-grade to anaplastic astrocytoma and is most prominent in perinecrotic areas of glioblastoma. There is, however, no evidence that CD95 expression in malignant gliomas is triggered by hypoxia or ischemia. Agonistic antibodies to CD95, or the natural ligand, CD95L, induce apoptosis in human malignant glioma cells in vitro. Glioma cell sensitivity to CD95-mediated apoptosis is regulated by CD95 expression at the cell surface and by the levels of intracellular apoptosis-regulatory proteins, including bcl-2 family members. Several cytotoxic drugs synergize with CD95L to kill glioma cells. For as yet unknown reasons, glioma cells may co-express CD95 and CD95L in vitro without undergoing suicide or fratricide. Yet, they kill T cells via CD95/CD95L interactions and are sensitive to exogenously added CD95L. Since CD95L is expressed in gliomas in vivo, too, forced induction of CD95 expression might promote therapeutic apoptosis in these tumors. That glioma cells differ from ...Continue Reading

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