酪酸梭菌--婴儿型双歧杆菌二联活菌制剂对人体肠道菌群的调节试验

目的　观察酪酸梭菌——婴儿型双歧杆菌二联活菌制剂对受试人群肠道菌群的影响。方法　检测受试者服用前后的肠道菌群并计数。结果　肠杆菌、肠球菌、拟杆菌的数量无明显变化 ,双歧杆菌、乳杆菌的数量明显增加 ,差异有非常显著性 (P<0 .0 1) ,结论　酪酸梭菌——婴儿型双歧杆菌二联活菌制剂具有一定的调节人体肠道菌群、增殖双歧杆菌和乳杆菌的作用。     

肠道菌群与肠易激综合征分型及患者血清细胞间黏附分子 1表达的关系

目的分析肠道菌群与IBS分型及患者血清细胞间黏附分子 1(ICAM 1)表达的关系,为后续研究提供参考。方法选择2018年12月至2020年1月我院收治的152例符合标准的肠易激综合征(IBS)患者作为观察组,并依照罗马Ⅲ标准将观察组患者分为腹泻型组(62例)、便秘型组(56例)、混合型组(34例);选择同期我院健康体检者30例为对照组。检测受试者粪便中双歧杆菌、乳杆菌、肠杆菌和肠球菌数量,同时检测受试者血清ICAM 1水平。采用Pearson相关性分析患者肠道菌群与血清ICAM 1关系,并采用Logistics回归模型分析肠道菌群与IBS各亚型的关系。结果观察组患者血清ICAM 1、肠道双歧杆菌、乳杆菌水平显著低于对照组,肠道肠杆菌和肠球菌水平显著高于对照组,差异均有统计学意义(均P<0.05)。不同亚型IBS患者血清ICAM 1、肠道双歧杆菌、乳杆菌、肠杆菌和肠球菌水平存在明显差异,其中混合组患者血清ICAM 1、肠杆菌、肠球菌数量最高,双歧杆菌、乳杆菌数量最低;腹泻型组肠道肠杆菌、肠球菌数量最低,双歧杆菌、乳杆菌数量最高(均P<0.05)。肠道中双歧杆菌、乳杆菌、肠杆菌、肠球菌数量是IBS分型的独立影响因素(均P<0.05)。患者肠道双歧杆菌、乳杆菌数量与ICAM 1水平呈显著负相关,而肠道肠杆菌和肠球菌数量与ICAM 1水平呈显著正相关(均P<0.05)。结论肠道菌群可影响IBS患者分型,且肠道中部分菌群与ICAM 1水平存在显著相关关系。     

酷酸梭菌——婴儿型双歧杆菌二联活菌制剂对人体肠道菌群的调节试验

目的 观察酷酸梭菌－－婴儿型双歧杆菌二联活菌制剂对受试人群肠道菌群的影响。方法 检测受试者服用前后的肠道菌群并计数。结果 肠杆菌、肠球菌、拟杆菌的数量无明显变化,双歧杆菌、乳杆菌的数量明显增加,差异有非常显著性（Ｐ〈０．０１）,结论 酪酸梭菌－－婴儿型双歧杆菌二联活菌制剂具有一定的调节人体肠道菌群、增殖双歧杆菌和乳杆菌的作用。     

酪酸梭菌-双歧杆菌二联活菌制剂对慢性腹泻患者肠道菌群的影响

给慢性腹泻病人口服酪酸梭菌-双歧杆菌二联活菌制剂,然后检测患者服药前后的肠道菌群变化.患者服用药品后,葡萄球菌、酵母菌、消化球菌、真杆菌和小梭菌的数量无明显变化,肠杆菌、肠球菌的数量明显减少,拟杆菌、双歧杆菌、乳杆菌的数量明显增加,其中肠球菌、肠杆菌、拟杆菌和双歧杆菌的变化有显著性(P﹤0.05),提示酪酸梭菌-双歧杆菌二联活菌制剂对慢性腹泻病人的肠道菌群具有明显的影响、具有增殖拟杆菌、双歧杆菌和乳杆菌的作用.     

活性乳酸菌饮料对人体肠道菌群影响的研究

目的 探讨一种活性乳酸菌饮料对人体肠道菌群的影响作用.方法 采用卫生部《保健食品检验与评价技术规范》调节肠道菌群功能检验方法进行检验.结果 试食组试验前后自身比较：肠道内双歧杆菌、乳杆菌数量明显增加（P＜0.01）,肠球菌数量增加（P＜0.05）,产气荚膜梭菌数量明显减少（P＜0.01）,肠杆菌和拟杆菌无明显变化;试验后对照组与试食组组间比较：双歧杆菌数量明显增加（P＜0.01）,乳杆菌的数量增加（P＜0.05）,肠杆菌、肠球菌、产气荚膜梭菌和拟杆菌无明显变化.结论 活性乳酸菌饮料具有调节人体肠道菌群、改善肠道内环境的作用.     

大豆低聚糖对肠道菌群结构调节的研究

目的 :对山松牌大豆低聚糖对肠道菌群调节的效果进行研究。方法 :通过动物实验和人体试验。结果 :山松牌大豆低聚糖能增殖体内乳杆菌和双歧杆菌数量 ;在较高剂量时 ,能使体内的肠球菌和肠杆菌增殖。采用B/E值 (即双歧杆菌和肠杆菌的比值 )作为指标进行分析发现 ,该制品在低剂量时能更好地优化肠道菌群结构。结论 :大豆低聚糖对肠道菌有较好的调节效果     

模拟失重对大鼠肠道菌群影响的研究

目的：研究模拟失重条件下大鼠肠道菌群变化情况。方法：选择性培养基分别对肠球菌、肠杆菌、类杆菌、乳杆菌以及双歧杆菌进行定量测定,扫描电镜观察大鼠盲肠上皮细胞的组织变化。结果：过路菌群中肠杆菌和肠球菌数量增加显著;原籍菌群中双歧杆菌减少十分明显,乳杆菌的数量也有不同程度的减少,而类杆菌的数量有增加的趋势。SD大鼠盲肠出现了肿胀细胞,上皮细胞颈毛排列紊乱、稀疏。结论：模拟失重条件下大鼠肠道微生态出现平衡失调。     

青春双歧杆菌对2型糖尿病模型大鼠肠道菌群和脂质代谢的影响

目的通过观察青春双歧杆菌对2型糖尿病模型大鼠肠道菌群的变化,和血清中总胆固醇（TC）、甘油三酯（TG）、高密度脂蛋白（HDL-C）、超氧化物歧化酶（SOD）和丙二醛（MDA）的水平,探讨青春双歧杆菌对2型糖尿病模型大鼠肠道功能和脂质代谢的影响。方法采用青春双歧杆菌灌胃2型糖尿病模型大鼠,取粪便检查正常菌群,取血和脏器检测TC、TG、HDL-C、SOD和MDA含量。结果青春双歧杆菌导致肠道内双歧杆菌、乳杆菌的数量增加,而肠杆菌、肠球菌数量下降;TC、TG和MDA水平下降,而HDL-C和SOD水平升高。结论青春双歧杆菌具有改善2型糖尿病模型大鼠肠道功能和降血脂作用,与二甲双胍联合应用效果更佳。     

大豆多糖对双歧杆菌及人肠道菌群生长的影响

目的研究大豆多糖对双歧杆菌及肠道菌群生长的影响。方法替换Bs培养基中的碳源,分为不加糖、加葡萄糖2％、加大豆多糖2％、加大豆多糖5％、加低聚果糖2％五组,加3种双歧杆菌（长双歧、青春双歧、两歧双歧）菌液1％,测其24h后的活菌数,比较大豆多糖对双歧杆菌生长的影响;替换Bs培养基中的碳源,分为不加糖、加葡萄糖2％、加大豆多糖2％,加低聚果糖2％四组,加人体粪便菌液1％,模拟人体肠道环境厌氧培养24h后,用选择性培养基测其肠杆菌、肠球菌、双歧杆菌、乳酸杆菌的活菌数,观察大豆多糖对人体肠道菌群的影响。结果大豆多糖添加量为5％时对长双歧的促进作用明显优于不加糖组（P〈0．05）;大豆多糖对人体肠道各菌群的生长促进作用与低聚果糖差异无显著性（P〉0．05）。结论大豆多糖对长双歧杆菌的体外促进作用较明显;以粪菌群发酵糖试验表明,大豆多糖对乳杆菌和双歧杆菌均有促进作用,和低聚果糖作用效果相比差异无显著性（P〉0．05）,具有益生元的特性。     

抑郁症人群肠道微生物群落结构与功能探讨

目的了解抑郁症人群肠道主要微生物群落情况,探讨在机体精神心理异常状态下肠道内微生态平衡特点,从而为研究抑郁症人群及相关精神心理疾患人群的防治新策略提供数据资料。方法设抑郁症患者研究组和健康对照组,采用日本光冈法定性定量检测肠道乳杆菌属、双歧杆菌属、类杆菌属、消化链球菌属、肠球菌属、产气荚膜梭菌、肠杆菌科及酵母菌的菌群值,计算和比较双歧杆菌属细菌数量与肠杆菌科细菌数量的对数值比值(B/E值)。结果与健康人对照组比较,抑郁症人群研究组肠道乳杆菌和双歧杆菌数量显著降低(P0.01);B/E值显著减少(P0.01);肠杆菌科细菌、肠球菌数量显著增加(P0.01,P0.05)。结论抑郁症人群肠道乳杆菌和双歧杆菌数量显著减少,肠杆菌科及肠球菌细菌数量显著增加,益生菌群与肠杆菌科结构发生改变,推测抑郁症的发生,有可能通过肠-脑轴的联系,使大脑情感中枢功能紊乱与肠道菌群微生态平衡失调的相互作用有关。     

阿莫西林干预对婴儿优势菌在无菌小鼠体内定植的影响

目的考察阿莫西林干预对婴儿优势菌双歧杆菌及乳杆菌在无菌小鼠体内定植的影响。方法 1日龄Balb/c无菌乳鼠接种婴儿粪便悬液。饲养至7~21日龄灌胃阿莫西林(100mg/kg),对照组在同日龄给予等体积的生理盐水。利用qRT-PCR检测小鼠粪便中双歧杆菌、乳杆菌的含量。结果阿莫西林处理可显著降低乳杆菌(P0.05)、双歧杆菌(P0.05)在无菌小鼠体内定植数量,但停药后饲养至成年(53日龄)二者定植数量与对照组小鼠比较差异无统计学意义(P0.05)。结论哺乳期阿莫西林干预会导致乳杆菌、双歧杆菌在小鼠体内定植量下降,但停药后小鼠饲养至成年二者可达到正常定植量,婴儿菌群定植小鼠模型可以模拟与现有动物模型一致的阿莫西林对双歧杆菌、乳杆菌定植的影响规律。     

斜纹夜蛾幼虫肠道细菌分离鉴定及其功能初步分析

昆虫肠道微生物对其寄主的生长发育、营养代谢、免疫以及农药抗性等方面都发挥着重要作用。为研究斜纹夜蛾Spodoptera litura幼虫肠道细菌的多样性,并为其功能验证做准备,本文利用传统微生物分离纯培养方法从斜纹夜蛾4龄幼虫肠道中共分离鉴定得到10株细菌,分别为属于变形菌门(Proteobacteria)的脱氮假单胞菌(Pseudomonas denitrificans),不动细菌(Acinetobacter sp.),肺炎克雷伯氏菌(Klebsiella pneumoniae)和肠杆菌(Enterobacter sp.);属于厚壁菌门(Firmicutes)的鸡葡萄球菌(Staphylococcus gallinarum),蒙氏肠球菌(Enterococcus mundtii),蜡样芽胞杆菌(Bacillus cereus)和枯草芽胞杆菌(Bacillus subtilis)以及放线菌门(Actinobacteria)的微杆菌(Microbacteriums sp.)和乳酪棒杆菌(Corynebacterium casei)。变形菌门和厚壁菌门是斜纹夜蛾肠道可培养细菌中的优势菌群。功能验证实验表明肠杆菌具备纤维素降解能力,微杆菌具备很强的苯酚降解能力。本研究为未来深入研究斜纹夜蛾肠道微生物的功能提供了方向和菌株材料。     

基于肠道微生态探讨黄连素在代谢性疾病中的抗炎作用

肠道菌群与能量代谢密切相关,其组成和代谢紊乱可通过多种途径导致胰岛素抵抗,肥胖和2型糖尿病。黄连素因具有减重、降糖、调脂等作用被广泛用于肥胖、2型糖尿病及非酒精性脂肪性肝病等代谢性疾病的辅助治疗;研究表明,黄连素可调节肠道菌群的组成和代谢,改善肠道微生态环境,从而改善胰岛素抵抗和代谢。本文综述了黄连素通过肠道菌群-炎症轴在干预代谢性疾病的研究进展,以期为代谢性疾病的治疗寻找新的策略,并为今后该领域的深入研究提供指导意义。     

低出生体重儿肠道微生态构建影响因素的 动态监测

目的动态监测低出生体重儿肠道菌群,分析不同体重、不同喂养方式及疾病状态等因素对患儿肠道微生态的影响,为规范临床低出生体重儿宫外营养支持措施及治疗手段提供依据。方法应用16SrRNA荧光定量PCR技术检测正常新生儿和低出生体重儿生后第1、3、7天粪便中大肠埃希菌、肠球菌、乳杆菌及双歧杆菌的含量。结果 (1)在生后7d内,无论正常新生儿还是低出生体重儿,其粪便中大肠埃希菌、肠球菌、乳杆菌和双歧杆菌的含量均随日龄的增加而增加,且生后7d内正常新生儿的粪便中大肠埃希菌、肠球菌、乳杆菌和双歧杆菌的含量均显著高于低出生体重儿(P0.05),正常新生儿生后7d内粪便中各细菌的增长率均高于低出生体重儿。(2)体重2 000~2 500g的低出生体重儿粪便中大肠埃希菌和肠球菌在各日龄中的含量明显高于体重2 000g的新生儿(P0.05);同时其粪便中双歧杆菌和乳杆菌含量在3日龄和7日龄阶段明显高于体重2 000g的新生儿(P0.05)。(3)3日龄和7日龄母乳喂养组的低出生体重儿粪便中双歧杆菌和乳杆菌含量明显高于乳制品喂养组(P0.05);且母乳喂养组新生儿生后7日内粪便中大肠埃希菌、乳杆菌和双歧杆菌含量的增长率均高于乳制品喂养组,尤其是双歧杆菌的增长率(126.49%vs 54.81%)。(4)合并并发症的3日龄和7日龄的低出生体重儿,粪便中乳杆菌和双歧杆菌含量均明显低于无合并症的低出生体重儿(P0.05);且无并发症组的低出生体重儿其粪便中肠球菌、乳杆菌和双歧杆菌的增长率均高于有并发症组的低出生体重儿,大肠埃希菌增长率则低于有并发症组。结论低出生体重儿肠道菌群的定植时间晚且数量少,体重、喂养方式及有无并发症是影响新生儿肠道菌群丰度的重要因素。母乳喂养可促进低出生体重儿肠道中益生菌的定植。疾病因素会导致肠道菌群丰度的降低,使肠道菌群紊乱,其程度可能与病情的严重程度相关。     

不同分娩方式对晚期早产儿肠道菌群的影响

目的 探讨不同分娩方式对晚期早产儿肠道菌群定植的影响。方法 以胎龄(周)为34~(0/7)～36~(6/7)的15例晚期早产儿为研究对象,根据分娩方式分为自然分娩组(n=8)和剖宫产组(n=7)。收集早产儿出生后3 d、7 d、14 d的粪便标本,应用高通量测序技术对细菌16S rRNA可变区中的V4区进行测序,分析肠道菌群多样性及组成结构。结果 (1)自然分娩组晚期早产儿粪便标本菌群多样性指数逐渐上升,剖宫产组的多样性指数较平稳,两组相比差异无统计学意义;(2)45份粪便标本中共检测出10个菌门,均以变形菌门、厚壁菌门、放线菌门和拟杆菌门为优势菌门,两组晚期早产儿生后变形菌门、拟杆菌门所占比例逐渐降低,厚壁菌门、放线菌门呈增多趋势。两组相比,剖宫产组7 d、14 d时拟杆菌门的相对丰度显著低于自然分娩组(Z=-2.896,P=0.004;Z=-2.120,P=0.040),变形菌门相对丰度仅在7 d时显著高于自然分娩组(Z=-2.190,P=0.030);(3)两组研究对象中,除自然分娩组14 d时以双歧杆菌属为优势菌属外,余下均以肠杆菌属为优势菌属。相比于自然分娩组,在7 d时剖宫产组拟杆菌属所占比例显著降低(Z=-2.806,P=0.005),肠杆菌属所占比例显著升高(Z=-2.199,P=0.030)。结论 剖宫产能显著影响婴儿早期肠道菌群的定植,降低肠道中早期拟杆菌的水平。     

栀子豉汤及拆方对六种人肠道菌的影响

目的研究栀子豉汤及栀子、淡豆豉对6种人肠道菌的影响。方法从特定人的粪便中分离培养肠杆菌、肠球菌、双歧杆菌、乳杆菌、产气荚膜梭菌和脆弱拟杆菌。分别将高、中、低浓度的栀子、淡豆豉及栀子豉汤药液加入选择性培养基中,以不加药液的培养基作为空白对照,将实验菌分别于厌氧或有氧条件下培养,计数菌落。结果不同浓度的栀子对肠杆菌的抑制率均为100.0%,淡豆豉在20%、50%、70%浓度分别使肠杆菌数量下调100.00%、53.83%和22.11%,而栀子豉汤可使肠杆菌数量维持在一定水平(104～106 CFU/g);两味药单独都表现了对肠球菌较强的抑制作用,而低、中浓度栀子豉汤则使肠球菌保持较稳定的数量;单味药及复方对产气荚膜梭菌和双歧杆菌敏感性较弱;栀子对脆弱拟杆菌抑制作用最强,而淡豆豉和栀子豉汤则可使其数量上调约20.00%;淡豆豉、栀子豉汤和高浓度栀子对乳杆菌非常敏感,低、中浓度栀子对乳杆菌数量仅有轻微下调作用。结论栀子豉汤比单独的栀子和淡豆豉更能维持肠道菌群的相对平衡。     

Immunology and probiotic impact of the newborn and young children intestinal microflora

Human body has developed a holistic defence system, which mission is either to recognize and destroy the aggressive invaders or to evolve mechanisms permitting to minimize or restore the consequences of harmful actions. The host immune system keeps the capital role to preserve the microbial intestinal balance via the barrier effect. Specifically, pathogenic invaders such as, bacteria, parasites, viruses and other xenobiotic invaders are rejected out of the body via barriers formed by the skin, mucosa and intestinal flora. In case physical barriers are breached, the immune system with its many components comes into action in order to fence infection. The intestine itself is considered as an “active organ” due to its abundant bacterial flora and to its large metabolic activity. The variation among different species or even among different strains within a species reflects the complexity of the genetic polymorphism which regulates the immune system functions. Additionally factors such as, gender, particular habits, smoking, alcohol consumption, diet, religion, age, gender, precedent infections and vaccinations must be involved. Hormonal profile and stress seems to be associated to the integrity microbiota and inducing immune system alterations. Which bacterial species are needed for inducing a proper barrier effect is not known, but it is generally accepted that this barrier function can be strongly supported by providing benefic alimentary supplements called functional foods. In this vein it is stressed the fact that early intestinal colonization with organisms such as Lactobacilli and Bifidobacteria and possibly subsequent protection from many different types of diseases. Moreover, this benefic microflora dominated but Bifidobacteria and Lactobacilli support the concept of their ability to modify the gut microbiota by reducing the risk of cancer following their capacity to decrease β-glucoronidase and carcinogen levels. Because of their beneficial roles in the human gastrointestinal tract, LAB are referred to as “probiotics”, and efforts are underway to employ them in modern nutrition habits with so-called functional foods. Members of Lactobacillus and Bifidobacterium genera are normal residents of the microbiota in the human gastrointestinal tract, in which they developed soon after birth. But, whether such probiotic strains derived from the human gut should be commercially employed in the so-called functional foods is a matter of debate between scientists and the industrial world. Within a few hours from birth the newborn develops its normal bacterial flora. Indeed human milk frequently contains low amounts of non-pathogenic bacteria like Streptococcus, Micrococcus, Lactobacillus, Staphylococcus, Corynebacterium and Bifidobacterium. In general, bacteria start to appear in feces within a few hours after birth. Colonization by Bifidobacterium occurs generally within 4 days of life. Claims have been made for positive effects of Bifidobacterium on infant growth and health. The effect of certain bacteria having a benefic action on the intestinal ecosystem is largely discussed during the last years by many authors. Bifidobacterium is reported to be a probiotic bacterium, exercising a beneficial effect on the intestinal flora. An antagonism has been reported between B. bifidum and C. perfringens in the intestine of newborns delivered by cesarian section. The aim of the probiotic approach is to repair the deficiencies in the gut flora and restore the protective effect. However, the possible ways in which the gut microbiota is being influenced by probiotics is yet unknown.     

小檗碱对大鼠肠道菌群结构的体外影响

目的研究小檗碱在体外对高脂饮食诱导的肥胖、胰岛素抵抗大鼠(HFD)肠道菌群和正常饮食对照大鼠(NCD)肠道菌群结构的体外影响。方法采用体外厌氧培养、PCR-DGGE和454焦磷酸测序技术研究小檗碱对肠道菌群结构和多样性的影响。结果 DGGE指纹图谱和454焦磷酸测序结果都表明,小檗碱可以改变肠道菌群的结构,高剂量的小檗碱可以减少肠道微生物的多样性。应用偏最小二乘法判别模型分析(PLS-DA)挑选与小檗碱相关的细菌类群(OTU),在HFD组中挑选了55个关键OTUs,其中53个被明显抑制或消除,剩余2个分别属于Proteus和Escherichia/Shigella属的OTUs则被小檗碱富集。在NCD组中挑选的51个关键OTUs中,32个被小檗碱抑制,17个被小檗碱富集。被富集的除了属于Klebsielal属的OTU外,还包括可以产生短链脂肪酸的Lactobacillus、Blautia属的OTUs。结论小檗碱可以直接调节肠道菌群的结构,对不同结构的肠道菌群其作用也不相同,不同浓度的小檗碱对肠道菌群的影响有较大差异。高浓度的小檗碱可以抑制大部分细菌的生长(其中有很多为肠道条件致病菌),减少肠道微生物的多样性,富集Enterobacteriaceae科的细菌(Proteus、Escherichia/Shigella、Klebsielal)。相较于HFD组,小檗碱可以显著富集NCD组大鼠肠道菌群中的短链脂肪酸产生菌。     

Modelling the effect of birth and feeding modes on the development of human gut microbiota

The human gut microbiota is transmitted from mother to infant through vaginal birth and breastfeeding. Bifidobacterium, a genus that dominates the infants’ gut, is adapted to breast milk in its ability to metabolize human milk oligosaccharides; it is regarded as a mutualist owing to its involvement in the development of the immune system. The composition of microbiota, including the abundance of Bifidobacteria, is highly variable between individuals and some microbial profiles are associated with diseases. However, whether and how birth and feeding practices contribute to such variation remains unclear. To understand how early events affect the establishment of microbiota, we develop a mathematical model of two types of Bifidobacteria and a generic compartment of commensal competitors. We show how early events affect competition between mutualists and commensals and microbe-host-immune interactions to cause long-term alterations in gut microbial profiles. Bifidobacteria associated with breast milk can trigger immune responses with lasting effects on the microbial community structure. Our model shows that, in response to a change in birth environment, competition alone can produce two distinct microbial profiles post-weaning. Adding immune regulation to our competition model allows for variations in microbial profiles in response to different feeding practices. This analysis highlights the importance of microbe–microbe and microbe–host interactions in shaping the gut populations following different birth and feeding modes.