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RESEARCH ARTICLE
Year : 2018  |  Volume : 13  |  Issue : 7  |  Page : 1216-1224

MicroRNA-219 alleviates glutamate-induced neurotoxicity in cultured hippocampal neurons by targeting calmodulin-dependent protein kinase II gamma


1 Department of Emergency, First Affiliated Hospital of Soochow University, Suzhou; Department of Emergency, Affiliated Hospital of Nantong University, Nantong, Jiangsu Province, China
2 Department of Pediatrics, Affiliated Hospital of Nantong University, Nantong, Jiangsu Province, China
3 Medical College of Nantong University, Nantong, Jiangsu Province, China
4 Department of Emergency, First Affiliated Hospital of Soochow University, Suzhou, Jiangsu Province, China

Correspondence Address:
Feng Xu
Department of Emergency, First Affiliated Hospital of Soochow University, Suzhou, Jiangsu Province
China
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Source of Support: This study was supported by the National Natural Science Foundation of China, No. 81101159; the Natural Science Foundation of Jiangsu Province of China, No. BK20151268, Conflict of Interest: None


DOI: 10.4103/1673-5374.235059

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Septic encephalopathy is a frequent complication of sepsis, but there are few studies examining the role of microRNAs (miRs) in its pathogenesis. In this study, a miR-219 mimic was transfected into rat hippocampal neurons to model miR-219 overexpression. A protective effect of miR-219 was observed for glutamate-induced neurotoxicity of rat hippocampal neurons, and an underlying mechanism involving calmodulin-dependent protein kinase II γ (CaMKIIγ) was demonstrated. miR-219 and CaMKIIγ mRNA expression induced by glutamate in hippocampal neurons was determined by quantitative real-time reverse transcription-polymerase chain reaction (qRT-PCR). After neurons were transfected with miR-219 mimic, effects on cell viability and apoptosis were measured by 3-(4,5-dimethylthiazolyl-2)-2,5-diphenyltetrazolium bromide (MTT) assay and flow cytometry. In addition, a luciferase reporter gene system was used to confirm CaMKIIγ as a target gene of miR-219. Western blot assay and rescue experiments were also utilized to detect CaMKIIγ expression and further verify that miR-219 in hippocampal neurons exerted its effect through regulation of CaMKIIγ. MTT assay and qRT-PCR results revealed obvious decreases in cell viability and miR-219 expression after glutamate stimulation, while CaMKIIγ mRNA expression was increased. MTT, flow cytometry, and caspase-3 activity assays showed that miR-219 overexpression could elevate glutamate-induced cell viability, and reduce cell apoptosis and caspase-3 activity. Moreover, luciferase CaMKIIγ-reporter activity was remarkably decreased by co-transfection with miR-219 mimic, and the results of a rescue experiment showed that CaMKIIγ overexpression could reverse the biological effects of miR-219. Collectively, these findings verify that miR-219 expression was decreased in glutamate-induced neurons, CaMKIIγ was a target gene of miR-219, and miR-219 alleviated glutamate-induced neuronal excitotoxicity by negatively controlling CaMKIIγ expression.


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