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BMP-6 Attenuates Oxygen and Glucose Deprivation-Induced Apoptosis in Human Neural Stem Cells through Inhibiting p38 MAPK Signaling Pathway
International Journal of Stem Cells
Published online October 31, 2021;  
© 2021 Korean Society for Stem Cell Research.

Li Wang, Yang Chen, Lin Wei, Jing He

Department of Obstetrics and Gynecology, The First Affiliated Hospital of Xi’an Medical University, Xi’an, China
Correspondence to: Jing He
Department of Obstetrics and Gynecology, The First Affiliated Hospital of Xi’an Medical University, No. 48 Fenghao West Road, Xi’an, Shaanxi 710077, China
Tel: +86-029-84353528, Fax: +86-029-84277756
E-mail: hejing710077@163.com
Received May 17, 2021; Revised September 24, 2021; Accepted September 24, 2021.
This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Background and Objectives: Neural stem cells (NSCs) remain in the mammalian brain throughout life and provide a novel therapeutic strategy for central nervous system (CNS) injury. Bone morphogenetic protein-6 (BMP-6) had shown a protective effect in different types of cells. However, the role of BMP-6 in NSCs is largely unclear. The present study was aimed to investigate whether BMP-6 could protect human NSCs (hNSCs) against the oxygen and glucose deprivation (OGD)-induced cell death.
Methods and Results: Upon challenge with OGD treatment, cell viability was significantly decreased in a time-dependent manner, as indicated by the CCK-8 assay. BMP-6 could attenuate the OGD-induced cell injury in a dose-dependent manner and decrease the number of TUNEL-positive cells. Moreover, BMP-6 markedly weakened the OGD-induced alterations in the expression of procaspase-8/9/3 and reversed the expression of cleaved-caspase-3. Interestingly, noggin protein (the BMP-6 inhibitor) attenuated the neuroprotective effect of BMP-6 in cultured hNSCs. Furthermore, the p38 MAPK signaling pathway was activated by OGD treatment and BMP-6 markedly inhibited the phosphorylation of p38 in a concentration-dependent manner. Pretreatment with noggin abolished the effect of BMP-6 on p38 activation. SB239063, a selective p38 inhibitor, exerted similar effects with BMP-6 in protecting hNSCs against the OGD-induced apoptosis. These results indicated that blocking the phosphorylation of p38 might contribute to the neuroprotective effect of BMP-6 against the OGD-induced injury in hNSCs.
Conclusions: These findings suggested that BMP-6 might be a therapeutic target in the OGD-induced cell death, which provides a novel therapeutic strategy for enhancing host and graft NSCs survival in hypoxic-ischemic brain injury.
Keywords : Human neural stem cells, BMP-6, Oxygen and glucose deprivation, Neuroprotection, p38 MAPK pathway