肌苷通过调节星形胶质细胞改善孕期感染导致的子代大鼠白质损伤  

Inosine improves offspring white matter injury caused by infection in pregnant rats via regulating astrocytes

作　　者：韩勇 李鑫 陈瑾 孙金萍[2] 马全瑞[1] HAN Yong;LI Xin;CHEN Jin;SUN Jinping;MA Quanrui(Department of Human Anatomy and Histoembryology,School of Basic Medical Science,Ningxia Medical University,Yinchuan 750004,China;Department of Pathology,General Hospita,Ningxia Medical University,Yinchuan 750004,China)

机构地区：[1]宁夏医科大学基础医学院人体解剖与组织胚胎学系,银川750004 [2]宁夏医科大学总医院病理科,银川750004

出　　处：《神经解剖学杂志》2024年第4期421-428,共8页Chinese Journal of Neuroanatomy

基　　金：宁夏自然科学基金(2023AAC03528)。

摘　　要：目的:探讨肌苷预处理妊娠期大鼠对母体炎症介导子代脑室周围白质软化(PVL)模型星形胶质细胞(Ast)反应的作用。方法:将妊娠期大鼠随机分为Control组、PVL组、IN-PVL组。PVL组:孕17 d(E17)大鼠腹腔注射细菌脂多糖(350μg/kg)2 d;IN-PVL组:E1大鼠饮用肌苷溶液(1 mg/ml,25 ml/d)16 d后腹腔注射细菌脂多糖2 d。取各组妊娠大鼠的新生7 d仔鼠脑组织,免疫荧光染色或Western Blot检测髓鞘碱性蛋白(MBP)、肿瘤坏死因子-α(TNF-α)、白细胞介素-6(IL-6)、白细胞介素-1β(IL-1β)、白细胞介素-4(IL-4)、白细胞介素-10(IL-10)、胶质纤维酸性蛋白(GFAP)、补体C3(C3)、S100钙结合蛋白A10(S100A10)、血小板源性生长因子(PDGF)、趋化因子配体1(CXCL1)和连接蛋白43(Cx43)的蛋白表达。结果:PVL组仔鼠较Control组髓鞘蛋白MBP着色面积减少、胞体肥大的Ast明显增多。而且,与Control组相比较,PVL组的促炎因子(TNF-α、IL-6、IL-1β)、GFAP、A1型Ast标记物C3及Ast连接蛋白Cx43的蛋白表达明显升高(P<0.05),抑炎因子(IL-4、IL-10)、MBP、A2型Ast标记物S100A10、Ast分泌产物(PDGF、CXCL1)的蛋白表达反而显著降低(P<0.05)。肌苷预处理可明显反转上述蛋白的表达(P<0.05)。结论:肌苷预处理妊娠大鼠可通过调控Ast反应性和促髓鞘形成物质的分泌改善子代PVL新生大鼠脑低髓鞘化。Objective:The aim of this study is to examine the impact of inosine pretreatment in pregnant rats on astrocyte(Ast)responses in the maternal inflammation-induced periventricular leukomalacia(PVL)model in offspring.Methods:The pregnant rats were divided into Control,PVL,and IN-PVL groups.In the PVL group,pregnant rats at gestational day 17(E17)received intraperitoneal injections of lipopolysaccharide(LPS)at a dose of 350μg/kg for 2 days.In the IN-PVL group,pregnant rats at E1 were administered an inosine solution(1 mg/ml,25 ml/day)for 16 days followed by intraperitoneal injections of LPS for 2 days.Newborn 7-day-old rat brains from each group of pregnant rats were collected,and the protein expression of myelin basic protein(MBP),tumor necrosis factor-α(TNF-α),interleukin-6(IL-6),interleukin-1β(IL-1β),interleukin-4(IL-4),interleukin-10(IL-10),glial fibrillary acidic protein(GFAP),complement 3(C3),S100 calcium binding protein A10(S100A10),platelet-derived growth factor(PDGF),chemokine ligand 1(CXCL1),and connexin 43(Cx43)were detected by immunofluorescence staining or Western Blot.Results:The PVL group exhibited a decrease in myelin MBP color area and an increase in hypertrophic Ast in contrast to the Control group.Additionally,protein expression levels of proinflammatory factors(TNF-α,IL-6,IL-1β),GFAP,A1 Ast marker C3,and Ast linker Cx43 were significantly elevated in the PVL group compared to the Control group(P<0.05).Conversely,protein expression levels of anti-inflammatory factors(IL-4,IL-10),MBP,A2 Ast marker S100A10,and Ast secreted products(PDGF,CXCL 1)were significantly decreased in the PVL group compared to the Control group(P<0.05).Inosine pretreatment effectively reversed the expression levels of these proteins(P<0.05).Conclusion:Inosine pretreatment of pregnant rats improved cerebral hypomyelination in offspring PVL neonatal rats by regulation of Ast responsiveness and the secretion of pro-myelinating substances.

关 键 词：肌苷 脑室周围白质软化 髓鞘 星形胶质细胞 大鼠 

分 类 号：R748[医药卫生—神经病学与精神病学]