Department of Anatomy, College of Veterinary Medicine, Research Institute of Life Science, Gyeongsang National University, Jinju, South Korea.
J Vet Med Sci. 2022 Sep 1;84(9):1194-1204. doi: 10.1292/jvms.22-0119. Epub 2022 Jul 13.
Ischemic stroke is a severe neurodegenerative disease with a high mortality rate. Retinoic acid is a representative metabolite of vitamin A. It has many beneficial effects including anti-inflammatory, anti-apoptotic, and neuroprotective effects. The purpose of this study is to identify specific proteins that are regulated by retinoic acid in ischemic stroke. Middle cerebral artery occlusion (MCAO) was performed to induce focal cerebral ischemia. Retinoic acid (5 mg/kg) or vehicle was injected intraperitoneally into male rats for four days prior to MCAO operation. Neurobehavioral tests were performed 24 hr after MCAO and the cerebral cortex was collected for proteomic study. Retinoic acid alleviates neurobehavioral deficits and histopathological changes caused by MCAO. Furthermore, we identified various proteins that were altered by retinoic acid in MCAO damage. Among these identified proteins, adenosylhomocysteinase, isocitrate dehydrogenase [NAD] subunit α, glycerol-3-phosphate dehydrogenase, Rab GDP dissociation inhibitor β, and apolipoprotein A1 were down-regulated in MCAO animals with vehicle treatment, whereas retinoic acid treatment alleviated these reductions. However, heat shock protein 60 was up-regulated in MCAO animals with vehicle, while retinoic acid treatment attenuated this increase. The changes in these expressions were confirmed by reverse transcription-PCR. These proteins regulate cell metabolism and mediate stress responses. Our results demonstrated that retinoic acid attenuates the neuronal damage by MCAO and regulates the various protein expressions that are involved in the survival of cells. Thus, we can suggest that retinoic acid exerts neuroprotective effects on focal cerebral ischemia by modulation of specific proteins.
缺血性脑卒中是一种死亡率较高的严重神经退行性疾病。视黄酸是维生素 A 的一种代表性代谢物,具有许多有益作用,包括抗炎、抗细胞凋亡和神经保护作用。本研究旨在鉴定视黄酸在缺血性脑卒中调节的特定蛋白质。通过大脑中动脉闭塞(MCAO)诱导局灶性脑缺血。在 MCAO 手术前 4 天,雄性大鼠通过腹腔内注射视黄酸(5mg/kg)或载体。MCAO 后 24 小时进行神经行为学测试,并采集大脑皮质进行蛋白质组学研究。视黄酸减轻了 MCAO 引起的神经行为缺陷和组织病理学变化。此外,我们鉴定了视黄酸在 MCAO 损伤中改变的各种蛋白质。在鉴定的蛋白质中,载脂蛋白 A1、腺苷同型半胱氨酸酶、异柠檬酸脱氢酶[NAD]亚基α、甘油-3-磷酸脱氢酶、Rab GDP 解离抑制剂β在 MCAO 动物中用载体处理时下调,而视黄酸处理减轻了这些减少。然而,热休克蛋白 60 在 MCAO 动物中用载体上调,而视黄酸处理减弱了这种增加。这些表达的变化通过逆转录-PCR 得到证实。这些蛋白质调节细胞代谢并介导应激反应。我们的结果表明,视黄酸通过调节参与细胞存活的各种蛋白质表达减轻 MCAO 引起的神经元损伤。因此,我们可以推测视黄酸通过调节特定蛋白质对局灶性脑缺血发挥神经保护作用。