Pro-apoptotic gene expression mediated by the p38 mitogen-activated protein kinase signal transduction pathway

Proceedings of the National Academy of Sciences of the United States of America
G S De Zutter, R J Davis

Abstract

Neurotrophic factor deprivation causes apoptosis by a mechanism that requires macromolecular synthesis. This fact suggests that gene expression is necessary to achieve cell death. To identify mRNA that is expressed in apoptotic cells we used subtractive hybridization with cDNA prepared from neuronal pheochromocytoma cells. Monoamine oxidase (MAO) expression was increased in cells during nerve growth factor withdrawal-induced apoptosis. The increased apoptosis and induction of MAO was prevented by inhibition of the p38 mitogen-activated protein (MAP) kinase pathway. MAO may contribute to the apoptotic process because inhibition of MAO activity suppressed cell death. Together, these data indicate that MAO may be a target of pro-apoptotic signal transduction by the p38 MAP kinase pathway.

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Apoptosis

Apoptosis is a specific process that leads to programmed cell death through the activation of an evolutionary conserved intracellular pathway leading to pathognomic cellular changes distinct from cellular necrosis