Apocynin이 분화된 PC12 세포에서 프로테아좀 억제에따른 세포자멸사에 미치는 억제효과
Inhibitory Effect of Apocynin on Proteasome Inhibition-Induced Apoptosis in Differentiated PC12 Cells
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Background: The dysfunction of the proteasome system has been implicated in neuronal degeneration. Apocynin, a specific inhibitor for nicotinamide adenine dinucleotide phosphate oxidase, has anti-inflammatory and anti-oxidant effects. However, the effect of apocynin on the neuronal cell death induced by proteasome inhibition has not been studied. Methods: Using differentiated PC12 cells, in the respect of cell death process the suppressive effect of apocynin on the proteasome inhibition-mediated apoptosis was examined. Results: The proteasome inhibitors MG132 and MG115 induced a decrease in Bid and Bcl-2 protein levels, an increase in Bax and p53 levels, mitochondrial depolarization, efflux of cytochrome c into cytosol and increase in caspases (-8, -9 and -3) activities. Treatment with apocynin attenuated the proteasome inhibitor-induced changes in the apoptosis-related protein levels, formation of reactive oxygen species, glutathione (GSH) depletion and cell death. Conclusions: Apocynin may attenuate the proteasome inhibitor-mediated apoptosis in differentiated PC12 cells by inhibiting the activation of the mitochondria-mediated pathway and the caspase-8- and Bid-dependent pathways. The preventive effect of apocynin appears to be attributed to inhibition of the production of reactive oxygen species and the depletion of cellular GSH contents.
Abstract
Background: The dysfunction of the proteasome system has been implicated in neuronal degeneration. Apocynin, a specific inhibitor for nicotinamide adenine dinucleotide phosphate oxidase, has anti-inflammatory and anti-oxidant effects. However, the effect of apocynin on the neuronal cell death induced by proteasome inhibition has not been studied. Methods: Using differentiated PC12 cells, in the respect of cell death process the suppressive effect of apocynin on the proteasome inhibition-mediated apoptosis was examined. Results: The proteasome inhibitors MG132 and MG115 induced a decrease in Bid and Bcl-2 protein levels, an increase in Bax and p53 levels, mitochondrial depolarization, efflux of cytochrome c into cytosol and increase in caspases (-8, -9 and -3) activities. Treatment with apocynin attenuated the proteasome inhibitor-induced changes in the apoptosis-related protein levels, formation of reactive oxygen species, glutathione (GSH) depletion and cell death. Conclusions: Apocynin may attenuate the proteasome inhibitor-mediated apoptosis in differentiated PC12 cells by inhibiting the activation of the mitochondria-mediated pathway and the caspase-8- and Bid-dependent pathways. The preventive effect of apocynin appears to be attributed to inhibition of the production of reactive oxygen species and the depletion of cellular GSH contents.
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