Zou Yu, Fang Chang-Le, Wang Ya-Ting, Li Hua, Guo Xi-Liang
Department of Neurology The First Affiliated Hospital of Jinzhou Medical University Jinzhou China.
Liaoning Key Laboratory of Diabetic Cognitive and Perceptive Dysfunction Jinzhou Medical University Jinzhou China.
Ibrain. 2022 Jul 9;8(3):353-364. doi: 10.1002/ibra.12052. eCollection 2022 Fall.
Neonatal hypoxic-ischemic encephalopathy (NHIE) causes devastating cerebral damage and neurological deficits that seldom have effective therapies. This study aimed to explore the mechanisms underlying the therapeutic efficacy of Scutellarin in NHIE. NHIE models were successfully established. Zea-longa score and triphenyte-trazoliumchloride (TTC) staining demonstrated that hypoxia and ischemia (HI) insult induced prominent neurological dysfunctions and brain infarction. Protein microarray was applied to detect the differentially expressed genes in the cortex, hippocampus, and lung tissues of HI rats, which revealed the downregulation of vascular endothelial growth factor (VEGF) in these tissues. Additionally, double immunostaining uncovered VEGF expression was localized in the neurons. Besides, VEGF was decreasingly expressed in oxygen-glucose deprivation (OGD) neurons, which was intriguingly reversed by Scutellarin treatment. Moreover, VEGF silencing increased OGD-induced neuronal apoptosis and attenuated neurite outgrowth, which was enhanced by Scutellarin administration. GeneMANIA predicted a close correlation of VEGF with caspase 3, caspase 7, and interleukin (IL)-1β, and qRT-PCR revealed that Scutellarin treatment depressed the expression levels of them elevated in OGD neurons, but the Scutellarin-depressed levels of these factors were prominently increased after VEGF silencing. Our findings suggested that Scutellarin exerted neuroprotective effects in NHIE potentially through mediating VEGF-targeted inactivation of caspase 3, caspase 7, and IL-1β.
新生儿缺氧缺血性脑病(NHIE)会导致严重的脑损伤和神经功能缺损,目前很少有有效的治疗方法。本研究旨在探讨灯盏花素治疗NHIE的疗效机制。成功建立了NHIE模型。Zea-longa评分和氯化三苯基四氮唑(TTC)染色表明,缺氧缺血(HI)损伤可导致明显的神经功能障碍和脑梗死。应用蛋白质芯片检测HI大鼠皮质、海马和肺组织中差异表达的基因,结果显示这些组织中血管内皮生长因子(VEGF)表达下调。此外,双重免疫染色显示VEGF表达定位于神经元。此外,VEGF在氧糖剥夺(OGD)神经元中的表达逐渐降低,而灯盏花素治疗可有趣地逆转这种降低。此外,VEGF沉默增加了OGD诱导的神经元凋亡并减弱了神经突生长,而灯盏花素给药可增强这种作用。GeneMANIA预测VEGF与半胱天冬酶3、半胱天冬酶7和白细胞介素(IL)-1β密切相关,qRT-PCR显示灯盏花素治疗可降低OGD神经元中升高的它们的表达水平,但在VEGF沉默后,灯盏花素降低的这些因子水平显著升高。我们的研究结果表明,灯盏花素可能通过介导VEGF靶向失活半胱天冬酶3、半胱天冬酶7和IL-1β对NHIE发挥神经保护作用。