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Neuroprotective Effects of a Wnt Antagonist in Quinolinic Acid-Induced Excitotoxicity in N18D3 CellsHwang, Jinsu; Park, Jong-Seong; Ramalingam, Mahesh; Kim, Byeong C; Jeong, Han-Seong; Jang, Sujeong
Cellular and molecular biology (Noisy-le-Grand, France), 2022-Aug-31, Letnik: 68, Številka: 8Journal Article
Excessive stimulation of the quinolinic acid induces neuronal cell death and is implicated in developing several neurodegenerative diseases. This study investigated whether a Wnt5a antagonist plays a neuroprotective role by regulating the Wnt pathway, activating cellular signaling mechanisms, including MAP kinase and ERK, and acting on the antiapoptotic and the proapoptotic genes in N18D3 neural cells. The cells were pretreated with a Wnt5a antagonist Box5, for one hour and then exposed to quinolinic acid (QUIN), an NMDA receptor agonist for 24 hours. An MTT assay and DAPI staining were used to evaluate cell viability and apoptosis, respectively, demonstrating that Box5 protected the cells from apoptotic death. In addition, a gene expression analysis revealed that Box5 prevented the QUIN-induced expression of the pro-apoptotic genes, BAD and BAX, and increased that of the anti-apoptotic genes, Bcl-xL, BCL2, and BCLW. Further examination of potential cell signaling candidates involved in this neuroprotective effect showed that the immunoreactivity of ERK was significantly increased in the cells treated with Box5. These results suggest that the neuroprotective mechanism of Box5 against QUIN-induced excitotoxic cell death involves the regulation of ERK and modulation of cell survival and death genes through decreasing the Wnt pathway, specifically Wnt5a.
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