摘要
目的研究鱼腥草总黄酮对单纯疱疹病毒性角膜炎(Herpes simplex keratitis,HSK)小鼠的免疫调节作用,并初步探讨其作用机制。方法采用手术刀片于Balb/c小鼠角膜上皮层划“#”字并接种I型单纯疱疹病毒(I type herpes simplex virus,HSV-1)构建HSK模型。将鉴定成功的HSK小鼠随机分为模型组、鱼腥草总黄酮低(75 mg/kg)、高(300 mg/kg)剂量组和高剂量鱼腥草总黄酮+Toll样受体(Toll-like receptor,TLR)2激动剂Pam3CSK4(0.3 mg/kg)组,另设置对照组,每组12只。造模及给药期间,每日采用裂隙灯显微镜观察小鼠角膜病变情况,并进行评分。给药结束后,HE染色观察小鼠角膜病理变化;ELISA检测小鼠血清中干扰素-γ(Interferon-γ,INF-γ)、白介素-2(Interleukin-2,IL-2)、IL-4和IL-6水平;Western blot检测小鼠角膜组织中TLR2、兔抗髓样分化因子88(MyD88)、核转录因子-κB p65(NF-κB p65)和p-NF-κB p65蛋白表达水平。结果与对照组比较,模型组小鼠出现角膜水肿、溃疡及新生血管,角膜病变损伤严重,存在大量炎性细胞浸润,血清中INF-γ与IL-2水平显著降低,而IL-4和IL-6水平显著升高,角膜组织中TLR2、MyD88蛋白表达水平及p-NF-κB p65/NF-κB p65蛋白比值显著升高(P<0.01)。与模型组比较,鱼腥草总黄酮低、高剂量组小鼠角膜损伤得到改善,角膜病变评分显著降低,血清中INF-γ与IL-2水平显著升高,IL-4和IL-6水平显著降低,角膜组织中TLR2、MyD88蛋白表达水平及p-NF-κB p65/NF-κB p65蛋白比值显著降低(均P<0.01)。然而,TLR2激动剂Pam3CSK4可部分逆转鱼腥草总黄酮对HSK小鼠角膜炎及免疫失衡的改善作用。结论鱼腥草总黄酮可有效改善HSK小鼠角膜损伤,调节免疫反应,抑制炎症水平,其作用机制可能与调控TLR2/NF-κB信号通路有关。
Objective To study the immune regulatory effect of total flavonoids from houttuynia cordata on herpes simplex keratitis(HSK)mice and preliminarily explore its mechanism.Methods A surgical blade to mark the"#"character on the corneal epithelial layer of Balb/c mice and inoculate with I type herpes simplex virus(HSV-1)was used to construct an HSK model.The successfully identified HSK mice were randomly divided into model group,low(75 mg/kg)and high-dose(300 mg/kg)total flavonoids from houttuynia cordata groups,and high-dose total flavonoids from houttuynia cordata+toll like receptor(TLR)2 agonist Pam3CSK4(0.3 mg/kg)group.A control group was also established with 12 mice in each group.During the modeling and administration period,the corneal lesions in mice were observed daily using a slit-lamp microscope and scored.After administration,HE staining was used to observe the pathological changes of the mouse cornea.ELISA was used to detect the levels of interferon-γ(INF-γ),interleukin-2(IL-2),IL-4,and IL-6 in mouse serum.Western blot was used to detect the protein expression levels of TLR2,myeloid differentiation factor 88(MyD88),nuclear factor-kappaB p65(NF-κB p65)and p-NF-κB p65 in mouse corneal tissue.Results Compared with the control group,the model group mice showed corneal edema,ulcers,and neovascularization,with severe corneal damage and a large number of inflammatory cell infiltration.The serum levels of INF-γand IL-2 significantly decreased,while the levels of IL-4 and IL-6 significantly increased(P<0.01).The protein expression levels of TLR2 and MyD88 and protein ratios of p-NF-κB p65/NF-κB p65 in corneal tissue significantly increased(P<0.01).Compared with the model group,the low and high dose of total flavonoids from houttuynia cordata groups showed improved corneal injury,the corneal lesion score significantly dereased(P<0.01).The serum levels of INF-γand IL-2 significantly increased,while the levels of IL-4 and IL-6 significantly decreased(P<0.01).The protein expression levels of TLR2 and MyD88 and protein ratios of p-NF-κB p65/NF-κB p65 in corneal tissue significantly decreased(P<0.01).However,the TLR2 agonist Pam3CSK4 partially reversed the improvement effects of total flavonoids from houttuynia cordata on keratitis and immune imbalance in HSK mice.Conclusion The total flavonoids of houttuynia cordata can effectively improve corneal damage,regulate immune response,and suppress inflammation levels in HSK mice.Its mechanism of action may be related to the regulation of TLR2/NF-κB signaling pathway.
作者
陆宏龙
赖飞娥
黄洪
覃艺群
LU Honglong;LAI Feie;HUANG Hong;QIN Yiqun(Department of Student Affairs of the CPC Committee,Nanning 530021,China;Department of Teacher Affairs of the CPC Committee,Nanning 530021,China;Dean’s Office,Nanning 530021,China;College of Vocational Skills,Guangxi Health Science College,Nanning 530021,China)
出处
《世界科学技术-中医药现代化》
北大核心
2025年第5期1426-1433,共8页
Modernization of Traditional Chinese Medicine and Materia Medica-World Science and Technology
基金
广西高校中青年教师科研基础能力提升项目(2021KY1373):网络药理学联合分子对接实验探讨鱼腥草抗单纯疱疹病毒性角膜炎的作用机制,负责人:陆宏龙。
