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Previous Article | Next Article
The Journal of Neuroscience, January 1, 1998, 18(1):104-111
Motoneuron Apoptosis Is Blocked by CEP-1347 (KT 7515), a Novel Inhibitor of the JNK Signaling Pathway
Anna C. Maroney1, Marcie A. Glicksman1, Alie N. Basma1, Kevin M. Walton1, Ernest Knight Jr1, Carol A. Murphy1, Becky A. Bartlett1, James P. Finn1, Thelma Angeles1, Yuzuru Matsuda2, Nicola T. Neff1, and Craig A. Dionne1 1 Cephalon Incorporated, West Chester, Pennsylvania 19380, and 2 Kyowa-Hakko Kogyo Company, Limited, Machida-shi, Tokyo 194, Japan
Neurons undergoing apoptosis can be rescued by trophic factors that simultaneously increase the activity of extracellular signal-regulated kinase (ERK) and decrease c-Jun N-terminal kinase (JNK) and p38. We identified a molecule, CEP-1347 (KT7515), that rescues motoneurons undergoing apoptosis and investigated its effect on ERK1 and JNK1 activity. Cultured rat embryonic motoneurons, in the absence of trophic factor, began to die 24-48 hr after plating. During the first 24 hr ERK1 activity was unchanged, whereas JNK1 activity increased fourfold. CEP-1347 completely rescued motoneurons for at least 72 hr with an EC50 of 20 ± 2 nM. CEP-1347 did not alter ERK1 activity but rapidly inhibited JNK1 activation. The IC50 of CEP-1347 for JNK1 activation was the same as the EC50 for motoneuron survival. Inhibition of JNK1 activation by CEP-1347 was not selective to motoneurons. CEP-1347 also inhibited JNK1 activity in Cos7 cells under conditions of ultraviolet irradiation, osmotic shock, and inhibition of glycosylation. Inhibition by CEP-1347 of the JNK1 signaling pathway appeared to be selective, because CEP-1347 did not inhibit p38-regulated mitogen-activated protein kinase-activated protein kinase-2 (MAPKAP2) activity in Cos7 cells subjected to osmotic shock. The direct molecular target of CEP-1347 was not JNK1, because CEP-1347 did not inhibit JNK1 activity in Cos7 cells cotransfected with MEKK1 and JNK1 cDNA constructs. This is the first demonstration of a small organic molecule that promotes motoneuron survival and that simultaneously inhibits the JNK1 signaling cascade.
Key words: motoneurons; indolocarbazole; CEP-1347; survival; apoptosis; c-Jun N-terminal kinase; mitogen-activated protein kinase; p38
Copyright © 1998 Society for Neuroscience 0270-6474/98/181104-08$05.00/0
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