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Lipid raft localization and palmitoylation: identification of two requirements for cell death induction by the tumor suppressors UNC5H.

Abstract：

:UNC5H receptors (UNC5H1, UNC5H2, UNC5H3) are putative tumor suppressors whose expression is lost in numerous cancers. These receptors have been shown to belong to the so-called family of dependence receptors. Such receptors induce apoptosis when their ligand netrin-1 is absent, thus conferring a state of cellular dependence towards ligand presence. Along this line, these receptors may limit tumor progression because they induce the death of tumor cells that grow in settings of ligand unavailability. We show here that UNC5H receptors are localized to cholesterol-and sphingolipid-enriched membrane domains called lipid rafts. We then demonstrate that the lipid raft localization of UNC5H2 is required for the pro-apoptotic activity of unbound UNC5H2. We also propose that this lipid raft localization is probably mediated via the recruitment of adaptor protein(s) within the death domain of UNC5H2 but is not dependent on the post-translational modification by palmitoylation of UNC5H2 even though this palmitoylation is required for UNC5H2 pro-apoptotic activity. Moreover we show that the interaction of UNC5H2 with the downstream pro-apoptotic serine threonine kinase DAPk is dependent on both UNC5H2 lipid raft localization and palmitoylation. Thus, we propose that the UNC5H dependence receptors require lipid raft localization and palmitoylation to trigger apoptosis.

journal_name

Exp Cell Res

journal_title

Experimental cell research

authors

Maisse C,Rossin A,Cahuzac N,Paradisi A,Klein C,Haillot ML,Hérincs Z,Mehlen P,Hueber AO

doi

10.1016/j.yexcr.2008.06.001

subject

Has Abstract

pub_date

2008-08-15 00:00:00

pages

2544-52

issue

14

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(08)00231-0

journal_volume

314

pub_type

杂志文章

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