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Studies in non-neuronal cells show that c-Jun N-terminal kinases (JNK) play a key role in apoptotic cell death. In some neurons JNK is also thought to initiate cell death by the activation of c-Jun. JNK inhibition has been achieved pharmacologically by inhibiting upstream kinases, but there has been no direct demonstration that inhibition of JNK can prevent neuronal death. We have therefore examined whether the JNK binding domain (JBD) of JNK-interacting protein-1 (JIP-1, a scaffold protein and specific inhibitor of JNK) can inhibit c-Jun phosphorylation and support the survival of sympathetic neurons deprived of NGF. We show that expression of the JBD in >80% of neurons was sufficient to prevent the phosphorylation of c-Jun and its nuclear accumulation as well as abrogate neuronal cell death induced by NGF deprivation. JBD expression also preserved the capacity of mitochondria to reduce MTT. Interestingly, although the PTB domain of JIP was reported to interact with rhoGEF, expression of the JBD domain was sufficient to localize the protein to the membrane cortex and growth cones. Hence, JNK activation is a key event in apoptotic death induced by NGF withdrawal, where its point of action lies upstream of mitochondrial dysfunction.

Original publication

DOI

10.1074/jbc.C000815200

Type

Journal article

Journal

J Biol Chem

Publication Date

16/02/2001

Volume

276

Pages

4531 - 4534

Keywords

Adaptor Proteins, Signal Transducing, Animals, Apoptosis, Carrier Proteins, Cell Culture Techniques, Ganglia, Sympathetic, JNK Mitogen-Activated Protein Kinases, Mitogen-Activated Protein Kinases, Nerve Growth Factor, Neurons, Phosphorylation, Protein Structure, Tertiary, Proto-Oncogene Proteins c-jun, Rats, Transfection