Modulation of the microRNA-378e/myocyte enhancer factor 2D axis by gastrodin in preventing cognitive dysfunction post-subarachnoid haemorrhage.

IF 2 4区 医学 Q3 PHYSIOLOGY
Journal of Physiology and Pharmacology Pub Date : 2024-12-01 Epub Date: 2025-02-03 DOI:10.26402/jpp.2024.6.04
Y G Hao, C Chen, H Ding
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引用次数: 0

Abstract

Subarachnoid hemorrhage (SAH) is a cerebral hemorrhagic disorder that can severely damage the brain and lead to cognitive impairment. Gastrodin (GAS) is the main bioactive ingredient extracted from Gastrodiae Rhizoma, which has neuroprotective effects against brain injury. The aim of this study was to investigate the potential treatment of cognitive dysfunction after SAH and to explore the mechanism of action of the multi-targeted drug Gastrodin to alleviate cognitive dysfunction after SAH. The SAH rat model was established by vascular puncture, and the target sequences were delivered to rats via adenoviral vectors. Dual luciferase reporter gene assay and RNA immunoprecipitation (RIP) assay were used to verify the targeting relationship between microRNA-378e (miR-378e) and myocyte enhancer factor 2D (MEF2D). Neurologic scores of rats were evaluated according to the modified Garcia scoring system. Learning memory ability of rats was determined by Morris water maze assay and open field assay. Rat brain edema index was determined by wet/dry method. Blood-brain barrier (BBB) permeability was assessed by Evan's blue assay. The pathological changes in the tissues were analyzed using hematoxylin-eosin (HE) staining, and the apoptosis of neuronal cells was analyzed using TUNEL. Reactive oxygen species (ROS) generation was observed using fluorescence microscopy. Oxidative stress was assessed through the analysis of ROS, malondialdehyde (MDA), superoxide dismutase (SOD), and glutathione (GSH). Tumor necrosis factor-alpha (TNF-α) and interleukin-1beta (IL-1β) levels in hippocampal tissue were measured by ELISA. A direct targeting relationship existed between miR-378e and MEF2D. The number of TUNEL-positive neurons in the hippocampus was significantly reduced after Gastrodin treatment compared to SAH rats (P<0.05). This finding was associated with the observed decrease in the level of the apoptosis-related Bcl-2-associated X (Bax) protein, the rise in B-cell lymphoma 2 (Bcl-2) expression, and the inhibition of cleaved caspase-3 activation after SAH (P<0.05). GAS effectively alleviated SAH-induced brain edema and blood-brain barrier dysfunction and reduced brain water content and Evan's blue in brain tissue (P<0.05). GAS significantly improved the learning and memory abilities of rats as tested by Morris water maze and open field experiments. In addition, the up-regulation of both oxidative stress and inflammatory response-related factors in tissues after SAH were reversed by GAS administration (P<0.05). Summing up the results, GAS ameliorates SAH-induced cognitive deficits and brain damage by modulating the miR-378e/MEF2D axis, exerting a cerebroprotective effect. This may provide some new clues for future therapies to mitigate the damage after SAH.

天麻素调节microRNA-378e/肌细胞增强因子2D轴预防蛛网膜下腔出血后认知功能障碍
蛛网膜下腔出血(SAH)是一种脑出血疾病,可严重损害大脑并导致认知障碍。天麻素(GAS)是从天麻中提取的主要生物活性成分,对脑损伤具有神经保护作用。本研究的目的是探讨SAH后认知功能障碍的潜在治疗方法,并探讨多靶点药物天麻素缓解SAH后认知功能障碍的作用机制。通过血管穿刺建立SAH大鼠模型,并通过腺病毒载体将靶序列传递给大鼠。采用双荧光素酶报告基因法和RNA免疫沉淀(RIP)法验证microRNA-378e (miR-378e)与肌细胞增强因子2D (MEF2D)的靶向关系。采用改良的Garcia评分系统对大鼠进行神经学评分。采用Morris水迷宫法和开阔场地法测定大鼠学习记忆能力。采用干湿法测定大鼠脑水肿指数。采用Evan蓝法测定血脑屏障(BBB)通透性。采用苏木精-伊红(HE)染色法观察各组组织病理变化,TUNEL法观察神经元细胞凋亡情况。荧光显微镜观察活性氧(ROS)的生成。通过分析ROS、丙二醛(MDA)、超氧化物歧化酶(SOD)和谷胱甘肽(GSH)来评估氧化应激。采用ELISA法检测海马组织中肿瘤坏死因子-α (TNF-α)和白细胞介素-1β (IL-1β)水平。miR-378e与MEF2D之间存在直接靶向关系。与SAH大鼠相比,天麻素治疗后海马中tunel阳性神经元数量显著减少(P
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来源期刊
CiteScore
4.00
自引率
22.70%
发文量
0
审稿时长
6-12 weeks
期刊介绍: Journal of Physiology and Pharmacology publishes papers which fall within the range of basic and applied physiology, pathophysiology and pharmacology. The papers should illustrate new physiological or pharmacological mechanisms at the level of the cell membrane, single cells, tissues or organs. Clinical studies, that are of fundamental importance and have a direct bearing on the pathophysiology will also be considered. Letters related to articles published in The Journal with topics of general professional interest are welcome.
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