Abstract
To investigate the role of mitogen-activated protein kinase (MAPK) and downstream events in cadmium (Cd)-induced neuronal apoptosis executed via the mitochondrial apoptotic pathway, this study used the PC-12 cell line as a neuronal model. The result showed that Cd significantly decreased cell viability and the Bcl-2 / Bax ratio and increased the percentage of apoptotic cells, release of cytochrome c, caspase-3, and poly(ADP-ribose) polymerase cleavage, and nuclear translocation of apoptosis-inducing factor (AIF) and endonuclease G. In addition, exposure to Cd-induced phosphorylation of extracellular signal-regulated kinase (ERK), c-Jun N-terminal kinase (JNK), and p38 MAPK. Inhibition of ERK and JNK, but not p38 MAPK, partially protected the cells from Cd-induced apoptosis. ERK and JNK inhibition also blocked alteration of the Bcl-2 / Bax ratio and cytochrome c release and suppressed caspase-3 and poly(ADP-ribose) polymerase cleavage and AIF and endonuclease G nuclear translocation. Taken together, these data suggest that the ERK- and JNK-mediated mitochondrial apoptotic pathway played an important role in Cd-induced PC12 cells apoptosis.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (No. 31101866, to Yan Yuan; No. 31172373, to Zong-ping Liu; No. 31302058, to Yi Wang ) and a project Funded by Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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Jiang and Yuan contributed equally to this work.
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Jiang, C., Yuan, Y., Hu, F. et al. Cadmium Induces PC12 Cells Apoptosis via an Extracellular Signal-Regulated Kinase and c-Jun N-Terminal Kinase-Mediated Mitochondrial Apoptotic Pathway. Biol Trace Elem Res 158, 249–258 (2014). https://doi.org/10.1007/s12011-014-9918-6
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DOI: https://doi.org/10.1007/s12011-014-9918-6