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Induction and attenuation of neuronal apoptosis by proteasome inhibitors in murine cortical cell cultures.

Suh, J; Lee, YA; Gwag, BJ
Journal of neurochemistry, 95(3):684-694, 2005
Journal Title
Journal of neurochemistry
Evidence has accumulated showing that pharmacological inhibition of proteasome activity can both induce and prevent neuronal apoptosis. We tested the hypothesis that these paradoxical effects of proteasome inhibitors depend on the degree of reduced proteasome activity and investigated underlying mechanisms. Murine cortical cell cultures exposed to 0.1 microM MG132 underwent widespread neuronal apoptosis and showed partial inhibition of proteasome activity down to 30-50%. Interestingly, administration of 1-10 microM MG132 almost completely blocked proteasome activity but resulted in reduced neuronal apoptosis. Similar results were produced in cortical cultures exposed to other proteasome inhibitors, proteasome inhibitor I and lactacystin. Administration of 0.1 microM MG132 led to activation of a mitochondria-dependent apoptotic signaling cascade involving cytochrome c, caspase-9, caspase-3 and degradation of tau protein; such activation was markedly reduced with 10 microM MG132. High doses of MG132 prevented the degradation of inhibitor of apoptosis proteins (IAPs) cIAP and X chromosome-linked IAP, suggesting that complete blockade of proteasome activity interferes with progression of apoptosis. In support of this, addition of high doses of proteasome inhibitors attenuated apoptosis of cortical neurons deprived of serum. Taken together, the present results indicate that inhibition of proteasome activity can induce or prevent neuronal cell apoptosis through regulation of mitochondria-mediated apoptotic pathways and IAPs.
MeSH terms
AnimalsApoptosis/drug effects*Caspase 3Caspases/antagonists & inhibitorsCaspases/metabolismCells, CulturedCerebral Cortex/cytologyCysteine Proteinase Inhibitors/pharmacology*Dose-Response Relationship, DrugDown-Regulation/drug effectsInhibitor of Apoptosis Proteins/metabolismLeupeptins/pharmacology*MiceMitochondria/metabolismNeurons/cytologyNeurons/drug effects*Neurons/enzymologyProteasome Endopeptidase Complex/antagonists & inhibitors*Proteasome Endopeptidase Complex/metabolismUbiquitin/metabolism
Appears in Collections:
Journal Papers > School of Medicine / Graduate School of Medicine > Pharmacology
Journal Papers > Research Organization > Institute for Medical Sciences
AJOU Authors
서, 재홍곽, 병주
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