Overexpression of long non-coding RNA H19 relieves hypoxia-induced injury by down-regulating microRNA-107 in neural stem cells.

BACKGROUND: Neonatal hypoxia-ischemia (HI) is one of the commonest conditions which seriously influences the development of infants' nervous system and causes series of neurological sequelaes. The aim of the present study was to analyze the potential regulatory mechanism of long non-coding (lnc) RNA H19 under hypoxia conditions.

METHODS: Neural stem cells (NSCs) were incubated in hypoxic conditions for 8 h to induce hypoxia injury. qRT-PCR was performed to detect H19 or micro (miR)-107 expression. Cell Counting Kit-8 (CCK-8) assay and Annexin V-FITC/PI staining assay were employed to detect the effects of hypoxia on cell viability and apoptosis, respectively. Moreover, NSCs were transfected with H19 overexpressing plasmid or shRNA-H19 and then subjected to hypoxia treatment. The effects of H19/miR-107 on NSC cell biological behaviors were confirmed. Furthermore, the signaling pathways involved in HI were analyzed using western blot.

RESULTS: Hypoxia treatment restrained cell viability and induced cell apoptosis in NSCs. Overexpression of lncRNA H19 attenuated hypoxia-induced NSCs injury, while knockdown of lncRNA H19 aggravated NSCs injury. Further experiments suggested that miR-107 up-regulation reversed the effects of lncRNA H19 overexpression on NSCs. Moreover, the activation of Wnt/β-catenin and PI3K/AKT pathways triggered by H19 were reversed by miR-107 up-regulation in hypoxia-treated NSCs.

CONCLUSION: LncRNA H19 overexpression attenuated hypoxia-induced NSCs injury and promoted activation of Wnt/β-catenin and PI3K/AKT pathways through downregulating miR-107.