The MLK family mediates c-Jun N-terminal kinase activation in neuronal apoptosis

被引:226
作者
Xu, ZH
Maroney, AC
Dobrzanski, P
Kukekov, NV
Greene, LA
机构
[1] Columbia Univ, Coll Phys & Surg, Dept Pathol, New York, NY 10032 USA
[2] Columbia Univ, Coll Phys & Surg, Ctr Neurobiol & Behav, New York, NY 10032 USA
[3] Cephalon Inc, W Chester, PA 19380 USA
关键词
D O I
10.1128/MCB.21.14.4713-4724.2001
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Neuronal apoptotic death induced by nerve growth factor (NGF) deprivation is reported to be in part mediated through a pathway that includes Rad and Cdc42, mitogen-activated protein kinase kinases 4 and 7 (MKK4 and -7), c-Jun N-terminal kinases (JNKs), and c-Jun. However, additional components of the pathway remain to be defined. We show here that members of the mixed-lineage kinase (MLK) family (including MLK1, MLK2, MLK3, and dual leucine zipper kinase [DLK]) are expressed in neuronal cells and are likely to act between Rac1/Cdc42 and MKK4 and -7 in death signaling. Overexpression of MLKs effectively induces apoptotic death of cultured neuronal PC12 cells and sympathetic neurons, while expression of dominant negative forms of MLKs suppresses death evoked by NGF deprivation or expression of activated forms of Rad and Cdc42. CEP-1347 (KT7515), which blocks neuronal death caused by NGF deprivation and a variety of additional apoptotic stimuli and which selectively inhibits the activities of MLKs, effectively protects neuronal PC12 cells from death induced by overexpression of MLK family members. In addition, NGF deprivation or UV irradiation leads to an increase in both level and phosphorylation of endogenous DLK. These observations support a role for MLKs in the neuronal death mechanism. With respect to ordering the death pathway, dominant-negative forms of MKK4 and -7 and c-Jun are protective against death induced by MLK overexpression, placing MLKs upstream of these kinases. Additional findings place the MLKs upstream of mitochondrial cytochrome c release and caspase activation.
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页码:4713 / 4724
页数:12
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