Ordering the cell death pathway. Differential effects of BCL2, an interleukin-1-converting enzyme family protease inhibitor, and other survival agents on JNK activation in serum/nerve growth factor-deprived PC12 cells - PubMed (original) (raw)
. 1996 Sep 6;271(36):21898-905.
doi: 10.1074/jbc.271.36.21898.
Affiliations
- PMID: 8702992
- DOI: 10.1074/jbc.271.36.21898
Free article
Ordering the cell death pathway. Differential effects of BCL2, an interleukin-1-converting enzyme family protease inhibitor, and other survival agents on JNK activation in serum/nerve growth factor-deprived PC12 cells
D S Park et al. J Biol Chem. 1996.
Free article
Abstract
Previous studies indicate that activation of c-Jun kinase (JNK) is necessary for apoptosis of trophic factor-deprived PC12 cells and that death in this system is suppressed by multiple agents, including BCL2, inhibitors of the interleukin-1-converting enzyme (ICE) family of proteases, blockers of transcription, and a variety of small molecules with differing modes of action. Here, we determine the order in which these agents block apoptosis relative to JNK activation. Overexpression of BCL2 promotes PC12 cell survival and blocks JNK activation caused by trophic factor withdrawal. Similarly, the survival-promoting agents aurintricarboxylic acid, N-acetylcysteine, the nitric oxide generator diethylenetriamine nitric oxide, 8-bromo-cGMP, and 8-(4-chlorophenylthio)-cAMP act upstream to inhibit JNK activation. In contrast, zVAD-fluoromethylketone (a permeant ICE family inhibitor), actinomycin D, and the G1/S cell cycle inhibitor deferoxamine, all promote survival after trophic factor withdrawal, but do not affect JNK activation. These findings are consistent with the presence of an ordered cell death pathway triggered by trophic factor deprivation in which 1) BCL2 and a number of survival-promoting agents act upstream of JNK, 2) ICE family protease actions, regulated genes required for cell death, and certain cell cycle blockers lie either downstream of JNK or on independent pathways required for apoptotic death.
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