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Anaplastic lymphoma kinase is a dependence receptor whose proapoptotic functions are activated by caspase cleavage.

Abstract：

:Anaplastic lymphoma kinase (ALK) is a receptor tyrosine kinase, initially discovered as part of the NPM-ALK fusion protein, resulting from the t(2;5) translocation that is frequently associated with anaplastic large-cell lymphomas. The native ALK protein is normally expressed in the developing and, at a weaker level, adult nervous system. We recently demonstrated that the oncogenic, constitutively kinase-activated NPM-ALK protein was antiapoptotic when expressed in Jurkat lymphoblastic cells treated with cytotoxic drugs. In contrast, we now show that Jurkat cells overexpressing the wild-type ALK receptor are more sensitive to doxorubicin-induced apoptosis than parental cells. Moreover, the ALK protein is cleaved during apoptosis in a caspase-dependent manner. Mutation of aspartic residues to asparagine allowed us to map the caspase cleavage site in the juxtamembrane region of ALK. In order to assess the role of ALK in neural cell-derived tissue, we transiently expressed ALK in the 13.S.1.24 rat neuroblast immortalized cell line. ALK expression led to apoptotic cell death of the neuroblasts. ALK ligation by specific activating antibodies decreased ALK-facilitated apoptosis in both lymphoid and neuronal cell lines. Moreover, ALK transfection reduced the survival of primary cultures of cortical neurons. Thus, ALK has a proapoptotic activity in the absence of ligand, whereas it is antiapoptotic in the presence of its ligand and when the kinase is intrinsically activated. These properties place ALK in the growing family of dependence receptors.

journal_name

Mol Cell Biol

journal_title

Molecular and cellular biology

authors

Mourali J,Bénard A,Lourenço FC,Monnet C,Greenland C,Moog-Lutz C,Racaud-Sultan C,Gonzalez-Dunia D,Vigny M,Mehlen P,Delsol G,Allouche M

doi

10.1128/MCB.01515-05

subject

Has Abstract

pub_date

2006-08-01 00:00:00

pages

6209-22

issue

16

eissn

0270-7306

issn

1098-5549

pii

26/16/6209

journal_volume

26

pub_type

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