Abstract
Schizophrenia is one of the most severe psychiatric disorders. Increasing evidence implicates that neurodegeneration is a component of schizophrenia pathology and some atypical antipsychotics are neuroprotective and successful in slowing the progressive morphological brain changes. As an antipsychotic agent, clozapine has superior and unique effects, but the intracellular signaling pathways that mediate clozapine action remain to be elucidated. The phosphatidylinositol-3-kinase/protein kinase B/Forkhead box O3 (PI3K/Akt/FoxO3a) pathway is crucial for neuronal survival. However, little information is available regarding this pathway with clozapine. In the present study, we investigated the protective effect of clozapine on the PC12 cells against corticosterone toxicity. Our results showed that corticosterone decreases the phosphorylation of Akt and FoxO3a, leading to the nuclear localization of FoxO3a and the apoptosis of PC12 cells, while clozapine concentration dependently protected PC12 cells against corticosterone insult. Pathway inhibitors studies displayed that the protective effect of clozapine was reversed by LY294002 and wortmannin, two PI3K inhibitors, or Akt inhibitor VIII although several other inhibitors had no effect. The shRNA knockdown results displayed that downregulated Akt1 or FoxO3a attenuated the protective effect of clozapine. Western blot analyses revealed that clozapine induced the phosphorylation of Akt and FoxO3a by the PI3K/Akt pathway and reversed the reduction of the phosphorylated Akt and FoxO3a and the nuclear translocation of FoxO3a evoked by corticosterone. Together, our data indicates that clozapine protects PC12 cells against corticosterone-induced cell death by modulating activity of the PI3K/Akt/FoxO3a pathway.
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Abbreviations
- Akt:
-
Protein kinase B
- BSA:
-
Bovine serum albumin
- DMEM:
-
Dulbecco’s modified Eagle’s medium
- DMSO:
-
Dimethyl sulfoxide
- ERK1/2:
-
Extracellular regulated protein kinases 1/2
- FBS:
-
Fetal bovine serum
- FoxO3a:
-
Forkhead box O3a
- GAPDH:
-
Glyceraldehyde 3-phosphate dehydrogenase
- GSK-3β:
-
Glycogen synthase kinase-3β
- HPA:
-
Hypothalamic–pituitary–adrenal
- IGF-1:
-
Insulin-like growth factor-1
- MAPK:
-
Mitogen-activated protein kinase
- MTT:
-
3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide
- OD:
-
Optical density
- PBS:
-
Phosphate-buffered saline
- PC12:
-
Pheochromocytoma cells
- PI3K:
-
Phosphatidylinositol 3-kinase
- ShRNA:
-
Short hairpin RNA
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Acknowledgments
This work was supported by National Natural Science Fund of China (No. 31371088) and the Science and Technology Development Fund (FDCT) of Macao (FDCT 021/2015/A1), Funding from Guangdong Science and Technology Department (No. 2011B050200005), SRG2015-00004-FHS and MYRG2016-00052-FHS from University of Macau.
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Zhiwen Zeng and Xue Wang contributed equally to this work.
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Zeng, Z., Wang, X., Bhardwaj, S.K. et al. The Atypical Antipsychotic Agent, Clozapine, Protects Against Corticosterone-Induced Death of PC12 Cells by Regulating the Akt/FoxO3a Signaling Pathway. Mol Neurobiol 54, 3395–3406 (2017). https://doi.org/10.1007/s12035-016-9904-4
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DOI: https://doi.org/10.1007/s12035-016-9904-4