甘草酸能减轻小鼠肺炎病毒引起的小鼠肺脏损伤  

Glycyrrhizic Acid Showed Therapeutic Effects on Severe Pulmonary Damages in Mice Induced by Pneumonia Virus of Mice Infection

作　　者：刘芸 冯婷婷 佟巍[1] 郭智 李夏 孔琪[1] 向志光[1] LIU Yun;FENG Tingting;TONG Wei;GUO Zhi;LI Xia;KONG Qi;XIANG Zhiguang(Institute of Laboratory Animal Science,Chinese Academy of Medical Sciences,Beijing 100021,China)

机构地区：[1]中国医学科学院医学实验动物研究所,北京100021

出　　处：《实验动物与比较医学》2024年第3期251-258,共8页Laboratory Animal and Comparative Medicine

基　　金：中国医学科学院创新工程资助项目“新型冠状病毒感染长期健康效应(Long COVID)与机制研究”(2022-I2M-CoV19-005)。

摘　　要：目的通过小鼠肺炎病毒(pneumonia virus of mice,PVM)感染近交系BALB/c小鼠建立病毒感染肺炎动物模型,观察PVM感染过程中促炎症警报素分子高迁移率族蛋白B1(high mobility group box 1,HMGB1)的变化,以及HMGB1抑制剂甘草酸(glycyrrhizic acid,GA)对小鼠肺脏感染损伤的在体干预作用。方法将3周龄的雌性BALB/c小鼠随机分为3组,每组6只。一组未经PVM感染,作为对照组(Control);另外两组先以1×10^(4)半数组织培养感染剂量(50%tissue culture infective dose,TCID_(50))/25μL剂量滴鼻接种PVM,然后分别给予GA生理盐水溶液灌胃(GA组)或单纯生理盐水灌胃(normal saline,NS组)处理,连续15 d。其间,观察并记录各组小鼠体重、外观等改变。在实验终点采集各组小鼠的肺脏组织样本,通过苏木精-伊红染色和免疫组织化学法检测小鼠肺脏组织内PVM和HMGB1蛋白的分布情况;通过实时荧光定量PCR法检测小鼠肺脏组织中HMGB1、Toll样受体4(Toll-like receptor 4,TLR-4)、晚期糖基化终产物特异性受体(advanced glycosylation end-product-specific receptor,AGER),以及白细胞介素(interleukin,IL)-1β、IL-2和肿瘤坏死因子α(tumor necrosis factor-α,TNF-α)等炎症因子的表达水平。结果与Control组相比,NS组小鼠6 d后体重显著下降(P<0.05),组织病理学结果显示其肺脏有明显的炎症病变,免疫组织化学结果显示HMGB1从细胞核释放至细胞质,实时荧光定量PCR结果显示HMGB1、IL-1β和IL-2的表达水平均显著上调(P<0.05);GA干预组的临床症状和体重无明显变化。而与NS组相比,GA干预组肺组织的病理损伤明显减轻,且肺组织中HMGB1、IL-1β、IL-2和干扰素γ(interferon-γ,IFN-γ)的表达水平显著下降(P<0.05),但AGER的表达水平显著增高(P<0.05)。结论PVM感染能引起明显的小鼠肺部炎症性病理损伤,而GA能有效减轻其损伤,其作用机制可能与激活HMGB1信号通路相关。Objective In this study,inbred BALB/c mice infected with the pneumonia virus of mice(PVM)were used to establish an animal model of viral pneumonia,and the changes in the pro-inflammatory alarmin molecule,high mobility group box 1 protein(HMGB1),during PVM infection were observed,as well as the invivointervention effects of the HMGB1 inhibitor,glycyrrhizic acid(GA),on PVM-induced lung injury.Methods Three-week-old female BALB/c mice were randomly divided into three groups,each consisting of 6 mice.One group,uninfected by PVM,served as the control group(Control).The other two groups were inoculated intranasally with PVM at a dose of 1×10^(4)50%tissue culture infective dose(TCID_(50))/25μL,and subsequently treated with GA saline solution(GA group)or plain saline solution(normal saline,NS group)via gavage for 15 consecutive days.During this period,changes in body weight and appearance were monitored in each group.At the end of the experiment,lung tissue samples were collected from all groups.The distribution of PVM and HMGB1 proteins in the lung tissues was analyzed using hematoxylin-eosin staining and immunohistochemistry.The expression levels of HMGB1 and its Toll-like receptor 4(TLR-4),advanced glycosylation end-product-specific receptor(AGER),and inflammatory cytokines such as interleukin(IL)-1β,IL-2,and tumor necrosis factor-α(TNF-α)in lung tissues of mice were measured using real time fluorescence quantitative PCR.Results Compared with the Control group,the NS group showed a significant weight loss after 6 days(P<0.05).Histopathological tests revealed pronounced inflammatory lesions in their lungs.Immunohistochemistry results showed that HMGB1 was released from the nucleus to the cytoplasm,and real time fluorescence quantitative PCR results indicated that the expression levels of HMGB1,IL-1β,and IL-2 were significantly upregulated(P<0.05).In the GA group,there was no significant change in the clinical symptoms or body weight.However,compared with the NS group,the pathological damages of lungtissues in the

关 键 词：甘草酸 高迁移率族蛋白B1 小鼠肺炎病毒 肺损伤 BALB/C小鼠 

分 类 号：Q95-33[生物学—动物学] R-332[医药卫生]