Akkermansia muciniphila改善gp120转基因小鼠的肠-脑相互作用障碍  

Akkermansia muciniphila gavage improves gut-brain interaction disorders in gp120 transgenic mice

作　　者：罗嘉纯 Batzaya Sodnomjamts 高雪锋 陈晶宇 余政颖 熊莎莎 曹虹 LUO Jiachun;Sodnomjamts Batzaya;GAO Xuefeng;CHEN Jingyu;YU Zhengying;XIONG Shasha;CAO Hong(Department of Microbiology,Guangdong Provincial Key Laboratory of Tropical Diseases Research,School of Public Health,Southern Medical University,Guangzhou 510515,China)

机构地区：[1]南方医科大学公共卫生学院微生物学系//广东省热带病研究重点实验室,广东广州510515

出　　处：《南方医科大学学报》2025年第3期554-565,共12页Journal of Southern Medical University

基　　金：国家自然科学基金(82172259);广东省自然科学基金(2024A1515010606)。

摘　　要：目的探究Akkermansia muciniphila(A.muciniphila)灌胃对HIV-1的包膜病毒蛋白gp120诱导HIV相关神经认知功能障碍(HAND)动物模型中肠道菌群紊乱及肠-脑相互作用障碍(DGBIs)的改善作用。方法用16S rRNA基因测序技术检测6、9、12月龄野生型(WT型)小鼠与gp120转基因(gp120tg)小鼠肠道微生物组。将12月龄小鼠分为WT+PBS组、WT+A.muciniphila组、gp120+PBS组、gp120+A.muciniphila组,持续6周用A.mucinophila(2×10^(8) CFU/小鼠)灌胃WT+A.muciniphila组及gp120+A.muciniphila组小鼠,1次/d。使用电子天平称量小鼠体质量。免疫组化法观察各组小鼠结肠内糖基化黏蛋白表达水平、嗜酸性粒细胞浸润情况、嗜酸性粒细胞激活标志物主要碱性蛋白(MBP)表达水平。ELISA法检测12月龄小鼠血清内脂多糖表达情况及结肠内IL-1β表达水平。qPCR法检测各组小鼠结肠内Occludin、ZO-1、IL-10、TNF-α、INF-γ表达水平。通过Morris水迷宫试验探究各组小鼠学习及空间记忆能力,通过免疫荧光法观察各组小鼠脑神经元损伤情况。结果与WT型小鼠相比,gp120tg小鼠肠道菌群辛普森多样性降低(P<0.001),其中12月龄gp120tg小鼠Akkermansia属丰富度下降(P<0.05);与12月龄WT型小鼠相比,12月龄gp120tg小鼠血清内脂多糖含量明显升高(P<0.01),小鼠结肠内糖基化黏蛋白表达明显下调(P<0.01),灌胃减小结肠内糖基化黏蛋白的差异且灌胃前后各组小鼠体质量差异无统计学意义(P>0.05);12月龄gp120tg小鼠结肠内紧密连接蛋白Occludin、ZO-1表达水平降低(P<0.001),并于灌胃后增加(P<0.001);12月龄gp120tg小鼠结肠内嗜酸性粒细胞存在明显的浸润激活及促炎细胞因子TNF-α(P<0.001)、INF-y(P<0.001)、IL-1β(P<0.05)表达水平的上调,而抑炎细胞因子IL-10表达水平降低(P<0.001),灌胃可减小其差异;12月龄gp120tg小鼠存在明显的认知损伤且海马及皮层中神经元数量减少(P<0.05),灌胃后小鼠认知损伤得到明显改善且海马�Objective To explore the effect of A.muciniphila gavage on intestinal microbiota and gut-brain interaction disorders(DGBIs)in gp120tg transgenic mouse models of HIV-associated neurocognitive disorder(HAND).Methods Intestinal microbiota was detected by 16S rRNA gene sequencing in 6-,9-,and 12-month-old wild-type(WT)mice and gp120tg transgenic mice.The 12-month-old WT and transgenic mice were divided into 2 groups for daily treatment with PBS or A.muciniphila gavage(2×10^(8) CFU/mouse)for 6 weeks.After the treatment,immunohistochemistry,ELISA and qPCR were used to detect changes in colonic expression levels of glycosylated mucins,MBP and IL-1β,eosinophil infiltration,serum lipopolysaccharide(LPS)levels,and colonic expressions of occludin,ZO-1,IL-10,TNF-αand INF-γmRNA.Morris water maze test and immunofluorescence assay were used to assess learning and spatial memory abilities and neuronal damage of the mice.Results Compared with WT mice,the transgenic mice exhibited significantly lowered Simpson's diversity of the intestinal microbiota with reduced abundance of Akkermansia genus,increased serum LPS levels and decreased colonic expression of glycosylated mucin.A.muciniphila gavage obviously ameliorated the reduction of glycosylated mucin in the transgenic mice without causing significant changes in body weight.The 12-month-old gp120tg mice had significantly decreased cdonic expressions of Occludin and ZO-1 with increased eosinophil infiltration and TNF-β,INF-γand IL-1βlevels and obviously lowered IL-10 level;all these changes were significantly mitigated by A.muciniphila gavage,which also improved cognitive impairment and neuronal loss in the hippocampus and cortex of the transgenic mice.Conclusion The gp120tg mice have lower intestinal microbiota richness and diversity than WT mice.The 12-month-old gp120tg mice have significantly reduced Akkermansia abundance with distinct DGBIs-related indexes,and A.muciniphila gavage can reduce intestinal barrier injury,colonic inflammation and eosinophil activation,cogniti

关 键 词：GP120 肠道菌群 肠-脑相互作用障碍 嗜酸性粒细胞 神经认知功能损伤 Akkermansia muciniphila 

分 类 号：R749.1[医药卫生—神经病学与精神病学] R512.91[医药卫生—临床医学]