Ameliorative effect of scutellarin on acute alcohol brain injury in mice

Ameliorative effect of scutellarin on acute alcohol brain injury in mice 灯盏花乙素对小鼠急性酒精性脑损伤的改善作用 1 equal first-author 2 equal 1 1 1 1 1 1 1 1 3 corresp Panpan ZHAO, zhaopp19@mails.jlu.edu.cn Panpan ZHAO, zhaopp19@mails.jlu.edu.cn zhaopp19@mails.jlu.edu.cn https://orcid.org/0000-0002-2494-3148 1 corresp corresp Panpan ZHAO, zhaopp19@mails.jlu.edu.cn Panpan ZHAO, zhaopp19@mails.jlu.edu.cn Jingquan DONG, 2018000029@jou.edu.cn Jingquan DONG, 2018000029@jou.edu.cn 2018000029@jou.edu.cn https://orcid.org/0000-0001-9696-9681 Jiangsu Key Laboratory of Marine Bioresources and Environment, Co-Innovation Center of Jiangsu Marine Bio-Industry Technology, Jiangsu Key Laboratory of Marine Pharmaceutical Compound Screening, Jiangsu Ocean University, Lianyungang 222005, China Jiangsu Key Laboratory of Marine Bioresources and Environment, Co-Innovation Center of Jiangsu Marine Bio-Industry Technology, Jiangsu Key Laboratory of Marine Pharmaceutical Compound Screening, Jiangsu Ocean University, Lianyungang 222005, China Department of Laboratory Medicine, the Second People’s Hospital of Lianyungang City, Lianyungang 222000, China Department of Laboratory Medicine, the Second People’s Hospital of Lianyungang City, Lianyungang 222000, China Key Laboratory of Zoonosis of Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun 130062, China Key Laboratory of Zoonosis of Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun 130062, China 随着酗酒导致的死亡比例逐年增加，酒精对机体造成的伤害越来越受到重视。氧化应激和炎症是酗酒引起的最常见的病理现象。灯盏花乙素是从灯盏花中提取的黄酮类化合物。它具有抗炎症和抗氧化活性，常被用于高血压、糖尿病、神经炎等多种疾病。但是灯盏花乙素对酒精性脑损伤的是否具有保护作用尚不明确。因此，本研究基于灯盏花乙素抗炎和抗氧化这两大靶点，建立了小鼠急性酒精性脑损伤模型，并进行组织病理学观察、生化指标检测和炎性因子表达测定。结果表明，灯盏花乙素可改善脑组织损伤，并显著降低由于酒精暴露引起的 IL-1β 、 IL-6 和 TNF-α 炎症因子的异常升高，同时也显著增强SOD、CAT等抗氧化酶的活性。因此，灯盏花乙素对酒精引起的急性脑损伤具有缓解作用。 酒精性脑损伤 灯盏花乙素 炎症 氧化应激 Drinking culture has high significance in both China and the world, whether in the entertainment sector or in social occasions; according to the World Health Organization's 2018 Global Alcohol and Health Report, about 3 million people died from excessive drinking in 2016, accounting for 5.3% of the total global deaths that year. Oxidative stress and inflammation are the most common pathological phenomena caused by alcohol abuse ( Snyder et al., 2017 Snyder et al., 2017 ). Scutellarin, a kind of flavonoid, is one of the main active ingredients extracted from breviscapine. It exerts anti-inflammatory, antioxidant, and vasodilation effects, and has been used to treat cardiovascular diseases and alcoholic liver injury. Although scutellarin can effectively alleviate multi-target organ injury induced by different forms of stimulation, its protective effect on alcoholic brain injury has not been well-defined. Therefore, the present study established an acute alcohol mice brain injury model to explore the effect of scutellarin on acute alcoholic brain injury. The study was carried out based on the targets of oxidative stress and inflammation, which is of great significance for the targeted therapy of clinical alcohol diseases. Alcohol exposure will promote the production of reactive oxygen species (ROS) ( Hathroubi et al., 2018 Hathroubi et al., 2018 ). ROS are the products of normal cell metabolism and the basis for maintaining cell homeostasis. A limited concentration of ROS participates in the inflammation and immune responses, enhancing the learning and memory capabilities. However, when ROS accumulate excessively in the brain, the antioxidant enzymes including copper/zinc superoxide dismutase (SOD), glutathione system, and catalase (CAT) will be largely consumed, and the imbalance of oxidants and antioxidants triggers oxidative stress. The brain, as an advanced organ that governs various behaviors of the limbs, has high oxygen consumption and low antioxidant capacity, and it is rich in unsaturated fatty acids. These factors make the brain organ extremely susceptible to oxidative stress. What is more, the production of ROS also leads to the oxidation of lipids containing carbon‍–‍carbon double bonds in the membrane lipid bilayer. Therefore, lipid peroxidation is accompanied by oxidative stress. Because of the high content of malondialdehyde (MDA) during lipid peroxidation, it is generally considered as a biomarker of this process ( Mas-Bargues et al., 2021 Mas-Bargues et al., 2021 ). The production of inflammatory cytokines is promoted by ROS ( Li et al., 2013 Li et al., 2013 ). The excessive accumulation of ROS caused by alcohol abuse can trigger inflammation, which leads to organ damage, such as that of the heart and the brain. Interleukin-1β (IL-1β) is a kind of interleukin cytokine, which is produced in response to stimulation in the early stage of inflammation and then induces the production of other inflammatory mediators, exacerbating the inflammatory response. IL-6 is a central proinflammatory cytokine. Tumor necrosis factor-‍α (TNF-‍α) is also an important proinflammatory cytokine, which can stimulate the release of IL-1β and cyclooxygenase (COX). Alfonso-Loeches et al. (2014) Alfonso-Loeches et al. (2014) found that alcohol stimulation led to neuroinflammation and brain damage by activating Toll like receptor-4 (TLR4)/IL-1 receptor Ⅰ (IL-1R I) in astrocytes, which induced the secretion of IL-1β, TNF-‍α, and IL-6 and the production of inflammatory mediators inducible nitric oxide synthase (iNOS) and COX-2. Oxidative stress and inflammation are two phenomena that have received much attention in recent years. Based on these two targets, this study established a model of alcoholic brain injury, and explored whether the anti-inflammatory and antioxidant activity of scutellarin can relieve the associated brain damage. This work applied scutellarin treatment in an acute brain injury model for the first time, providing an effective method for the prevention of alcoholic brain injury worldwide, which has great future significance. We established an alcoholic brain injury model using specific pathogen-free (SPF) BALB/c male mice (6 weeks old, weighing 18‒22 g), purchased from Pizhou Dongfang Breed Co., Ltd. (Pizhou, China). The mice were randomly divided into five groups with six individuals in each group, including the negative control group, the alcohol group (diluted to 50% (volume fraction) in water), and the scutellarin treatment groups with low, middle, and high doses (10, 25, and 50 mg/kg body weight (BW)‍+50% (volume fraction) ethanol, 12 mL/kg BW, respectively). Equal volumes of distilled water or scutellarin were injected once daily for 3 d intraperitoneally, and alcohol was administered by oral gavage 12 h after the last injection. The mice were fasted for 12 h after ethanol treatment and then euthanized for further experiments. In order to observe whether scutellarin can alleviate brain damage caused by alcohol, the cerebrum tissue samples were stained by hematoxylin and eosin (H & E) staining. As shown in Fig. 1 Fig. 1 , in the alcohol group, the morphology and structure of cerebrum tissue cells were severely altered, with almost all neurons contracting and showing hyperchromatism. The nucleus and cytoplasm were indistinguishable. Compared with the alcohol group, the samples in the low- and medium-dose scutellarin treatment displayed no obvious change, accompanied by capillary swelling and decreased neurons, while the high-dose scutellarin treatment group showed sharply reduced neuron shrinkage and exhibited shallow staining. In order to explore how scutellarin affects oxidative stress in the brain caused by alcohol, this work tested the activity of related antioxidant enzymes and the content of MDA, a marker of lipid peroxidation in brain tissue. As shown in Fig. 2 Fig. 2 a, compared with the control group, the MDA content in the cerebrum of the alcohol-treated group was significantly increased. After scutellarin pre-treatment, the MDA content was significantly lower than that in the alcohol group. However, in the cerebellum, different phenomena were observed: only the middle and high doses led to significant differences compared with the alcohol group, while the low doses resulted in no difference from the alcohol group ( Fig. 2 Fig. 2 b). The determination of the activity of antioxidant enzymes SOD and CAT showed that the activity of these two antioxidant enzymes in the two brain tissues was significantly reduced in the alcohol group (Figs. 2c 2c – 2e 2e ). In the cerebrum tissue, only high-dose scutellarin could increase the SOD activity, while medium- and low-dose scutellarin had no effect on the SOD activity. Interestingly, compared with the alcohol group, all doses of scutellarin increased the SOD activity in the cerebellum (Figs. 2c 2c and 2d 2d ). However, for CAT activity, the alcohol group exhibited no effect on the cerebellum, and pre-treatment with scutellarin had no effect on the cerebellum CAT activity ( Fig. 2 Fig. 2 f). In order to validate whether scutellarin can alleviate the inflammation caused by alcohol exposure, we detected the messenger RNA (mRNA) expression levels of key inflammatory factors. As shown in Fig. 3 Fig. 3 , compared with the control group, the expression levels of IL-1β , IL-6 , TNF-α , and the activity of iNOS in the cerebrum of acute alcohol-treated mice were significantly increased. Low-dose scutellarin treatment had no effect on the reduction of inflammatory factors TNF-‍α or iNOS. Other doses of scutellarin could reduce the increases in the expression of proinflammatory-related factors caused by acute alcohol exposure. In the low-dose scutellarin group, in addition to the significantly reduced expression of iNOS, the expression of other inflammatory factors in the cerebellum was consistent with that in the cerebrum ( Fig. 4 Fig. 4 ). Alcohol abuse has become so frequent around the world that alcohol-related injuries, such as accidental and pathological injuries, account for a large proportion of total deaths each year. Although alcoholic brain injury is fairly common, no commercial drugs have been developed for treatment. Therefore, this study aimed to determine the preventive and protective effects of scutellarin on acute alcohol exposure by establishing an acute alcoholic mice brain injury model. The molecular mechanisms of oxidative stress and inflammation induced by alcohol stimulation may be related to the activation of several signaling pathways. The nuclear factor erythroid-2-related factor (Nrf2) signaling pathway is a representative signaling pathway of oxidative stress. Nrf2, as an important transcription factor for nuclear transcription to regulate cellular oxidative stress response, if stimulated by certain agents (such as ROS imbalance stimulants), will not bind stably with Kelch-like epichlorohydrin (ECH)-associated protein l (Keap-1) in the cytoplasm and will be transferred to the nucleus, combine with antioxidant response elements, and enhance the expression of downstream antioxidants. A previous study showed that babaodan could reduce the contents of ROS and MDA, upregulate the expression of antioxidant enzyme heme oxygenase-1 (HO-1) protein, and alleviate ethanol-induced acute brain injury through Nrf2 activation ( Yu et al., 2019 Yu et al., 2019 ). Exercise has protective function via upregulating the decreased activity of the antioxidant enzymes SOD and CAT in the heart and liver induced by acute alcohol stimulation by promoting the activation of the Nrf2/Keap-1/HO-1 pathway ( Fan et al., 2021 Fan et al., 2021 ). As a powerful antioxidant, scutellarin could increase the mRNA expression of HO-1 and nicotinamide adenine (phosphate) dinucleotide (NAD(P)H) quinone oxidoreductase 1 (NQO1), while inhibiting Nrf2 could significantly reverse the protective effect of scutellarin on the hypoxia/reoxygenation-related injury of liver cells ( Wu and Jia, 2019 Wu and Jia, 2019 ). In addition, scutellarin could reduce the content of MDA in the hippocampus, and it enhanced the antioxidant and defense components, such as SOD, CAT, and glutathione (GSH), and alleviated cognitive defects induced by lipopolysaccharide in rats ( Baluchnejadmojarad et al., 2018 Baluchnejadmojarad et al., 2018 ). Based on the target of oxidative stress, it was speculated that scutellarin might play a similar antioxidant effect in the pathological model of alcoholic brain injury in this study, while Fig. 2 Fig. 2 confirmed this speculation. Furthermore, the protective effect of scutellarin on the brain may also depend on the regulation of the Nrf2 pathway, which needs to be determined by deeply exploring the protective mechanism of scutellarin against acute alcohol brain injury in the future. The brain tissue inflammation caused by alcohol stimulation may be related to the activation of the nuclear factor-‍κB (NF-‍κB) pathway. NF‍-‍κB, a heterodimer composed of p65/p50 or p52/v-rel reticuloendotheliosis viral oncogene homolog B (RelB), is an important transcription factor that can regulate a variety of biological activities, including cell proliferation, apoptosis, and inflammation ( Liu et al., 2020 Liu et al., 2020 ). Under normal circumstances, NF‍-‍κB in the cytoplasm is inactive, and its dimer complex can combine with the inhibitor of NF‍-‍κB (IkB) to form a new trimeric complex. Once the NF‍-‍κB pathway is activated, the IκB protein is phosphorylated, dissociating it from the trimer, and the dimer of NF-κB rapidly moves from the cytoplasm to the nucleus, triggering an inflammatory cascade. For example, TNF‍-‍α stimulation triggered osteoarthritis by significantly upregulating the mRNA expression of inflammatory factors IL-1β, IL-6, and the activity of iNOS, and increasing the phosphorylated protein contents of IκBα and NF‍-‍κB p65, which in turn led to osteoarthritis ( Wang et al., 2019 Wang et al., 2019 ). Grape-leaf extract could alleviate alcohol-induced liver injury by inhibiting the activation of the NF‍-‍κB pathway and the expression of proinflammatory factors IL-6 and TNF‍-‍α ( Amen et al., 2020 Amen et al., 2020 ). Besides, Zhang et al. (2014) Zhang et al. (2014) demonstrated that microRNA (miR)‍-339-5p regulated the brain inflammation induced by the alcohol-induced overexpression of IL-1β , IL-6 , and TNF‍-‍α by inhibiting the NF‍-‍κB pathway. Therefore, it is conjectured that scutellarin could play a similar anti-inflammatory effect in alcoholic brain injury in this study, and Figs. 3 3 and 4 4 confirmed this assumption. Whether the anti-inflammatory roles of scutellarin in acute alcohol brain injury are regulated by the NF‍-‍κB pathway needs further clarification. In short, brain damage caused by acute alcohol stimulation, regardless of what signal pathway is activated, is closely related to inflammation and oxidative stress. Therefore, clarifying the roles of scutellarin on these two targets in acute alcohol brain injury is of great significance for subsequent research on specific signaling pathways. Scutellarin has been widely used in clinical practice due to its high efficiency and safety, such as its anti-inflammatory and antioxidant activity in cerebral ischemia perfusion injury and angina pectoris. In addition, the anti-tumor activity of scutellarin has been reported in a large number of clinical studies. For example, scutellarin inhibited the growth of xenograft tumors from patients with esophageal cancer by directly targeting protein kinase B (PKB or Akt) ( Wang et al., 2015 Wang et al., 2015 ), and it has also been used to inhibit the metastasis of glioma cells. Scutellarin could be combined with Western drugs in clinical practice, such as glucocorticoids in the treatment of sudden sensorineural hearing loss ( Zheng et al., 2020 Zheng et al., 2020 ) and enalapril in the treatment of kidney damage in diabetic rats ( Xu et al., 2013 Xu et al., 2013 ). Although scutellarin has many benefits, it faces the problem of low bioavailability. The main reasons for this may include its low oral solubility, limited membrane permeability, and the impact of first pass elimination in the gastrointestinal tract. In recent years, researchers have attempted to improve the oral bioavailability of scutellarin using nanoparticles, liposome nanocomposite particles, phospholipid complexes, and other agents ( Wang et al., 2017 Wang et al., 2017 ). In summary, our research results suggest that acute alcohol exposure causes oxidative stress and inflammation; however, these two phenomena can be alleviated by scutellarin by upregulating antioxidant enzyme activity and downregulating the expression of inflammatory factors. Scutellarin is therefore considered to be a promising agent for the prevention of acute alcoholic brain injury, as well as a potential candidate for the prevention and treatment of other clinical diseases. Materials and methods 1 Detailed methods are provided in the electronic supplementary materials of this paper. 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Adv Ther , 37 ( 12 ): 4959 - 4968 . https://doi.org/10.1007/s12325-020-01513-9 https://doi.org/10.1007/s12325-020-01513-9 Glucocorticoid and breviscapine combination therapy versus glucocorticoid alone on sudden sensorineural hearing loss in patients with different audiometric curves Tianmeng ZHANG: research design, writing original draft, and editing. Kun WANG: conceptualization, software, formal analysis, and visualization. Hui FAN, Xiao ZHANG, and Feixue LIU: investigation and data curation. Qiankun YANG, Xin FENG, Yi CHEN, and Daoyang TENG: methodology. Panpan ZHAO and Jingquan DONG: data curation, resources, and project administration. 10.1631/jzus.B2100763 1673-1581（2022）03-0258-07 This work was supported by the Basic Science (Natural Science) Research Project of Higher Education of Jiangsu Province (No. 21KJB230001), the Open Foundation of Jiangsu Key Laboratory of Marine Pharmaceutical Compound Screening (No. HY202101), and the Priority Academic Program Development of Jiangsu Higher Education Institutions of China. 2021-09-07 2021-10-28 2022-03-15 2022-04-19 2022-02-23 Copyright © Zhejiang University and Springer-Verlag GmbH Germany, part of Springer Nature 2022 2022 浙江大学出版社 Tianmeng ZHANG, Kun WANG, Hui FAN, Qiankun YANG, Xiao ZHANG, Feixue LIU, Xin FENG, Yi CHEN, Daoyang TENG, Panpan ZHAO, and Jingquan DONG declare that they have no conflict of interest. All experiments were approved by the Ethics Committee of Jiangsu Ocean University, Lianyungang, China (No. 2020220670). Laboratory animals were provided with humanitarian care, and the number of animals used and the pain caused to experimental animals were minimized. Compliance with ethics guidelines Supplementary information 1 Materials and methods 浙江大学学报（英文版）（B辑：生物医学和生物技术） 3 23