Abstract
Our previous study demonstrated that platelet-derived growth factor-BB (PDGF-BB) increased the cell proliferation of primary rat neuronal progenitor cells (NPCs). However, whether PDGF-BB regulates neurogenesis in HIV-associated neurological disorder (HAND) remains largely unknown. In this study we demonstrated that pre-treatment of NPCs with PDGF-BB restored Tat-mediated impairment of cell proliferation via activation of p38 and JNK MAPK pathways. Moreover, treatment with PDGF-BB induced inactivation of glycogen synthase kinase-3β (GSK-3β), evidenced by its phosphorylation at Ser9, this effect was significantly inhibited by the p38 and JNK inhibitors. Level of nuclear β-catenin, the primary substrate of GSK-3β, was also concomitantly increased following PDGF-BB treatment, suggesting that PDGF-BB stimulates NPC proliferation via acting on GSK-3β to promote nuclear accumulation of β-catenin. This was further validated by gain and loss of function studies using cells transfected with either the wild type or mutant GSK-3β constructs. Together these data underpin the role of GSK-3β/β-catenin as a novel target that regulates NPC proliferation mediated by PDGF-BB with implications for therapeutic intervention for reversal of impaired neurogenesis inflicted by Tat.
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28 October 2020
A Correction to this paper has been published: https://doi.org/10.1007/s11481-020-09961-4
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This work was supported by grants MH-068212, DA020392, DA023397 and DA024442 from the National Institutes of Health.
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Jie Chao and Lu Yang are contributed equally to the work.
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Chao, J., Yang, L., Yao, H. et al. Platelet-Derived Growth Factor-BB Restores HIV Tat -Mediated Impairment of Neurogenesis: Role of GSK-3β/β-Catenin. J Neuroimmune Pharmacol 9, 259–268 (2014). https://doi.org/10.1007/s11481-013-9509-x
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DOI: https://doi.org/10.1007/s11481-013-9509-x