期刊
BRAIN BEHAVIOR AND IMMUNITY
卷 65, 期 -, 页码 183-194出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbi.2017.05.001
关键词
Bexarotene; RXR; IncRNA; Neat1; Pidd1; TBI
资金
- National Natural Science Foundation of China [81571159, 81371319]
- National Natural Science Foundation [81601072]
- Chongqing Graduate Innovation Project [40010200100417]
Objective: Bexarotene treatments exert neuroprotective effects on mice following traumatic brain injury (TBI). The present study aims to investigate the potential roles of the long noncoding RNA Neat1 in the neuroprotective effects of bexarotene. Materials and methods: Adult male C57BL/8J mice (n = 80) and newborn mice (within 24 h after birth) (n = 20) were used to generate a controlled cortical impact (CCI) model and harvest primary cortex neurons, respectively. The HT22 cell line and the BV2 cell line were cultured under normal or oxygen/glucose-deprived (OGD) conditions. The relationship between RXR-alpha and the Neat1 promoter was clarified using ChIP-qPCR and dual-luciferase reporter gene assays. The mRNA alterations induced by Neat1 knockdown were measured using next-generation RNA sequencing. Proteins were captured by Neat1, pulled down and subjected to mass spectrometry. The neurological severity score, rotarod test and water maze test were employed to measure the animals' motor and cognitive functions. Results: Bexarotene prominently up-regulated the Neat1 level in an RXR-alpha-dependent manner. Neat1 knockdown induced significant changes in mRNA expression, and the altered mRNAs were involved in many biological processes, including synapse formation and axon guidance. In primary neurons, Neat1 knockdown inhibited and Neat1 over-expression prompted axon elongation. Multiple proteins, including Pidd1, were captured by Neat1. Neat1 inhibited cell apoptosis and restricted inflammation by capturing Pidd1. The in vitro anti-apoptotic and anti-inflammatory effects of Neat1 were further confirmed in C57BL/6 mice, which resulted in better motor and cognitive function after TBI. Conclusion: Bexarotene up-regulates the IncRNA Neat1, which inhibits apoptosis and inflammation, thereby resulting in better functional recovery in mice after TBI. (C) 2017 Elsevier Inc. All rights reserved.
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