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Tiwari SK, Seth B, Agarwal S, Yadav A, Karmakar M, Gupta SK, Choubey V, Sharma A, Chaturvedi RK. Ethosuximide Induces Hippocampal Neurogenesis and Reverses Cognitive Deficits in an Amyloid-β Toxin-induced Alzheimer Rat Model via the Phosphatidylinositol 3-Kinase (PI3K)/Akt/Wnt/β-Catenin Pathway. J Biol Chem 2015; 290:28540-28558. [PMID: 26420483 DOI: 10.1074/jbc.m115.652586] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Indexed: 01/20/2023] Open
Abstract
Neurogenesis involves generation of new neurons through finely tuned multistep processes, such as neural stem cell (NSC) proliferation, migration, differentiation, and integration into existing neuronal circuitry in the dentate gyrus of the hippocampus and subventricular zone. Adult hippocampal neurogenesis is involved in cognitive functions and altered in various neurodegenerative disorders, including Alzheimer disease (AD). Ethosuximide (ETH), an anticonvulsant drug is used for the treatment of epileptic seizures. However, the effects of ETH on adult hippocampal neurogenesis and the underlying cellular and molecular mechanism(s) are yet unexplored. Herein, we studied the effects of ETH on rat multipotent NSC proliferation and neuronal differentiation and adult hippocampal neurogenesis in an amyloid β (Aβ) toxin-induced rat model of AD-like phenotypes. ETH potently induced NSC proliferation and neuronal differentiation in the hippocampus-derived NSC in vitro. ETH enhanced NSC proliferation and neuronal differentiation and reduced Aβ toxin-mediated toxicity and neurodegeneration, leading to behavioral recovery in the rat AD model. ETH inhibited Aβ-mediated suppression of neurogenic and Akt/Wnt/β-catenin pathway gene expression in the hippocampus. ETH activated the PI3K·Akt and Wnt·β-catenin transduction pathways that are known to be involved in the regulation of neurogenesis. Inhibition of the PI3K·Akt and Wnt·β-catenin pathways effectively blocked the mitogenic and neurogenic effects of ETH. In silico molecular target prediction docking studies suggest that ETH interacts with Akt, Dkk-1, and GSK-3β. Our findings suggest that ETH stimulates NSC proliferation and differentiation in vitro and adult hippocampal neurogenesis via the PI3K·Akt and Wnt·β-catenin signaling.
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Affiliation(s)
- Shashi Kant Tiwari
- Developmental Toxicology Laboratory, Systems Toxicology and Health Risk Assessment Group, Council of Scientific and Industrial Research (CSIR)-Indian Institute of Toxicology Research, 80 MG Marg, Lucknow 226001, India; Academy of Scientific and Innovative Research, Council of Scientific and Industrial Research (CSIR)-Indian Institute of Toxicology Research, 80 MG Marg, Lucknow 226001, India
| | - Brashket Seth
- Developmental Toxicology Laboratory, Systems Toxicology and Health Risk Assessment Group, Council of Scientific and Industrial Research (CSIR)-Indian Institute of Toxicology Research, 80 MG Marg, Lucknow 226001, India; Academy of Scientific and Innovative Research, Council of Scientific and Industrial Research (CSIR)-Indian Institute of Toxicology Research, 80 MG Marg, Lucknow 226001, India
| | - Swati Agarwal
- Developmental Toxicology Laboratory, Systems Toxicology and Health Risk Assessment Group, Council of Scientific and Industrial Research (CSIR)-Indian Institute of Toxicology Research, 80 MG Marg, Lucknow 226001, India; Academy of Scientific and Innovative Research, Council of Scientific and Industrial Research (CSIR)-Indian Institute of Toxicology Research, 80 MG Marg, Lucknow 226001, India
| | - Anuradha Yadav
- Developmental Toxicology Laboratory, Systems Toxicology and Health Risk Assessment Group, Council of Scientific and Industrial Research (CSIR)-Indian Institute of Toxicology Research, 80 MG Marg, Lucknow 226001, India; Academy of Scientific and Innovative Research, Council of Scientific and Industrial Research (CSIR)-Indian Institute of Toxicology Research, 80 MG Marg, Lucknow 226001, India
| | - Madhumita Karmakar
- Developmental Toxicology Laboratory, Systems Toxicology and Health Risk Assessment Group, Council of Scientific and Industrial Research (CSIR)-Indian Institute of Toxicology Research, 80 MG Marg, Lucknow 226001, India
| | - Shailendra Kumar Gupta
- Systems Toxicology and Health Risk Assessment Group, Council of Scientific and Industrial Research (CSIR)-Indian Institute of Toxicology Research, 80 MG Marg, Lucknow 226001, India
| | - Vinay Choubey
- Department of Pharmacology, Centre of Excellence for Translational Medicine; University of Tartu, Tartu 50411, Estonia
| | - Abhay Sharma
- CSIR-Institute of Genomics and Integrative Biology, Sukhdev Vihar, Mathura Road, 110025 New Delhi, India.
| | - Rajnish Kumar Chaturvedi
- Developmental Toxicology Laboratory, Systems Toxicology and Health Risk Assessment Group, Council of Scientific and Industrial Research (CSIR)-Indian Institute of Toxicology Research, 80 MG Marg, Lucknow 226001, India; Academy of Scientific and Innovative Research, Council of Scientific and Industrial Research (CSIR)-Indian Institute of Toxicology Research, 80 MG Marg, Lucknow 226001, India
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