Abstract
Spinal cord injury (SCI) induces the disruption of the blood-spinal cord barrier (BSCB), which leads to infiltration of blood cells, inflammatory responses and neuronal cell death, with subsequent development of spinal cord secondary damage. Recent reports pointed to an important role of retinoic acid (RA), the active metabolite of the vitamin A, in the induction of the blood–brain barrier (BBB) during human and mouse development, however, it is unknown whether RA plays a role in maintaining BSCB integrity under the pathological conditions such as SCI. In this study, we investigated the BSCB protective role of RA both in vivo and in vitro and demonstrated that autophagy are involved in the BSCB protective effect of RA. Our data show that RA attenuated BSCB permeability and also attenuated the loss of tight junction molecules such as P120, β-catenin, Occludin and Claudin5 after injury in vivo as well as in brain microvascular endothelial cells. In addition, RA administration improved functional recovery of the rat model of trauma. We also found that RA could significantly increase the expression of LC3-II and decrease the expression of p62 both in vivo and in vitro. Furthermore, combining RA with the autophagy inhibitor chloroquine (CQ) partially abolished its protective effect on the BSCB and exacerbated the loss of tight junctions. Together, our studies indicate that RA improved functional recovery in part by the prevention of BSCB disruption via the activation of autophagic flux after SCI.
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14 October 2020
This article has been retracted. Please see the Retraction Notice for more detail: https://doi.org/10.1007/s11064-020-03149-1.
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Acknowledgments
This study was partially supported by a research Grant from the National Natural Science Funding of China (81302775, 81472165, 81200958, 81372112), Zhejiang Provincial Natural Science Foundation of China (LY14H090013, LY14H150010, LY14H170002), Zhejiang Provincial Program for the Cultivation of High-level Innovative Health talents (to J.X.). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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This article has been retracted. Please see the retraction notice for more detail:https://doi.org/10.1007/s41980-020-00472-9
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11064_2015_1756_MOESM1_ESM.tif
RA inhibits apoptosis protein caspase-12 expression after SCI. Representative western blots and quantification data of Cle-caspase-12 in each group rats. *P < 0.01, versus SCI group. Data represent mean values ± SEM, n = 4 (TIFF 347 kb)
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Zhou, Y., Zheng, B., Ye, L. et al. RETRACTED ARTICLE: Retinoic Acid Prevents Disruption of Blood-Spinal Cord Barrier by Inducing Autophagic Flux After Spinal Cord Injury. Neurochem Res 41, 813–825 (2016). https://doi.org/10.1007/s11064-015-1756-1
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DOI: https://doi.org/10.1007/s11064-015-1756-1