血清成纤维细胞生长因子21和脂肪酸结合蛋白4检测对急性ST段抬高型心肌梗死患者经皮冠状动脉介入治疗术后心力衰竭的预测价值

目的探究血清成纤维细胞生长因子21(FGF21)和脂肪酸结合蛋白4(FABP4)检测对急性ST段抬高型心肌梗死(STEMI)患者经皮冠状动脉介入治疗(PCI)术后心力衰竭的预测价值。方法选取2020年9月至2022年9月内蒙古医科大学附属医院接诊的113例STEMI患者为研究对象,依据PCI术后1年是否发生心力衰竭(心衰),将其分为心衰组(n=32)和非心衰组(n=81)。应用ELISA法测定血清FGF21、FABP4表达水平,比较两组血清FGF21、FABP4水平,多因素logistic回归分析影响STEMI患者PCI术后发生心力衰竭的相关因素,ROC曲线评估血清FGF21、FABP4水平对STEMI患者PCI术后心力衰竭发生的预测价值。结果心衰组心率次数、C反应蛋白(CRP)、心肌肌钙蛋白(cTnI)、N末端B型利钠肽原(BNP)、利尿剂使用比例均显著高于非心衰组,左心室射血分数(LVEF)显著低于非心衰组(P<0.05)。心衰组血清FGF21、FABP4表达水平均明显高于非心衰组[(228.37±33.07)ng/L比(185.68±25.52)ng/L、(34.26±5.51)ng/ml比(26.87±4.67)ng/ml,t=7.345、7.195,P<0.05]。血清FGF21(95%CI 1.371~8.191)、FABP4(95%CI 1.176~4.090)及发病到至导丝通过时间(95%CI 1.058~8.157)是影响STEMI患者PCI术后发生心力衰竭的危险因素(OR>1,P<0.05),LVEF(95%CI 0.473~0.913)是保护因素(OR<1,P<0.05)。血清FGF21、FABP4单独及二者联合预测STEMI患者PCI术后发生心力衰竭的曲线下面积(AUC)分别为0.828、0.856、0.934,二者联合优于单一(Z二者联合-FGF21=1.971、Z二者联合-FABP4=2.417,P=0.048、P=0.015)。结论STEMI患者PCI术后发生心力衰竭血清FGF21、FABP4水平均明显升高,二者联合对STEMI患者PCI术后发生心力衰竭的风险具有更高的预测价值。

miR-21对人口腔癌细胞株HSQ-89增殖、侵袭与迁移的影响实验研究

目的:探讨微小核糖核酸-21(miR-21)介导Smad7调节转化生长因子β(TGF-β)/Smad信号通路对人口腔癌细胞株HSQ-89增殖、侵袭与迁移的作用。方法:取人口腔癌细胞株HSQ-89培养传代,分为阴性对照组、下调组、上调组和正常组,前三者分别采用脂质体转染法将携带阴性对照(NC inhibitor)、miR-21抑制剂(miR-21 inhibitor)、miR-21模拟物(miR-21 mimics)载体进行转染,正常组仅添加等量无菌蒸馏水。观察各组细胞增殖、侵袭、迁移能力;实时-定量聚合酶链反应(RT-qPCR)检测各组细胞miR-21、TGF-β_(1)、Smad3、Smad7、细胞周期蛋白D1(CCND1)、MYC、E-钙黏蛋白(E-cadherin)、波形蛋白(Vimentin)、基质金属蛋白酶-2(MMP-2)mRNA表达;蛋白免疫印迹法(WB)检测各组细胞TGF-β_(1)、Smad3、Smad7、CCND1、MYC、E-cadherin、Vimentin、MMP-2蛋白表达及p-Smad3水平;双荧光素酶报告基因检测验证miR-21是否靶向Smad7。结果:与正常组和阴性对照组比较,上调组细胞增殖、侵袭、迁移能力上升,下调组细胞增殖活性下降、侵袭细胞数减少、划痕愈合率下降(均P<0.05);与正常组和阴性对照组比较,上调组细胞miR-21表达、TGF-β_(1)、Smad3、CCND1、MYC、Vimentin、MMP-2 mRNA和蛋白表达上升、Smad7和E-cadherin mRNA和表达下降,差异有统计学意义(均P<0.05),下调组细胞miR-21表达、TGF-β_(1)、Smad3、CCND1、MYC、Vimentin、MMP-2 mRNA和蛋白表达下降、Smad7和E-cadherin mRNA和蛋白表达上升(均P<0.05);经双荧光素酶报告基因实验验证miR-21靶向Smad7。结论:miR-21促进口腔癌细胞增殖、侵袭和迁移,可能与调节Smad7、TGF-β/Smad信号通路相关。

R2R3-type Lo MYB21 affects jasmonate-regulated development and dehiscence of anthers in lily(Lilium oriental hybrids)

Lilies are widely cultivated for cut flowers,but their large anthers carry a considerable amount of colored pollen that is dispersed easily.Studying the molecular mechanism of anther development and dehiscence could help solve this problem.LoMYB21,encoding a putative R2R3v-myb avian myeloblastosis viral oncogene homolog(MYB)transcription factor,was identified from oriental lilies(Lilium‘Siberia’).Real-time quantitative PCR analysis showed that LoMYB21 was mainly expressed in the anther,filament and stigma and had high expression during the late stages of lily anther development.LoMYB21 had transactivation activity and was located in the nucleus through yeast one-hybrid assays and transient expression in Nicotiana benthamiana.Suppression of LoMYB21 by virus-induced gene silencing(VIGS)in Lilium‘Siberia’led to anther indehiscence and reduced the expression of genes related to Jasmonate acid(JA)biosynthesis and signal transduction.Induction of LoMYB21 in DEX::LoMYB21 transgenic Arabidopsis caused procumbent inflorescences that became infertile,accompanied by higher expression of JA biosynthetic and signaling genes.These results demonstrated that JA content and signaling were abnormal in silenced lily and transgenic LoMYB21 Arabidopsis,which affected anther development.Our study indicated that LoMYB21 could regulate lily anther dehiscence through JA biosynthesis and signaling during the late stages of anther development.

A multi-functional MgF_(2)/polydopamine/hyaluronan-astaxanthin coating on the biodegradable ZE21B alloy with better corrosion resistance and biocompatibility for cardiovascular application

The cardiovascular diseases(CVD)continue to be the major threat to global public health over the years,while one of the effective methods to treat CVD is stent intervention.Biomedical magnesium(Mg)alloys have great potential applications in cardiovascular stents benefit from their excellent biodegradability and absorbability.However,excessive degradation rate and the delayed surface endothelialization still limit their further application.In this study,we modified a Mg-Zn-Y-Nd alloy(ZE21B)by preparing MgF_(2) as the corrosion resistance layer,the dopamine polymer film(PDA)as the bonding layer,and hyaluronic acid(HA)loaded astaxanthin(ASTA)as an important layer to directing the cardiovascular cells fate.The electrochemical test results showed that the MgF_(2)/PDA/HA-ASTA coating improved the corrosion resistance of ZE21B.The cytocompatibility experiments also demonstrated that this novel composite coating also selectively promoted endothelial cells proliferation,inhibited hyperproliferation of smooth muscle cells and adhesion of macrophages.Compared with the HAloaded rapamycin(RAPA)coating,our MgF_(2)/PDA/HA-ASTA coating showed better blood compatibility and cytocompatibility,indicating stronger multi-functions for the ZE21B alloy on cardiovascular application.

时间限制性进食对HFpEF小鼠心肌损伤改善及血清和心肌组织FGF21水平调节作用

目的观察时间限制性进食(TRF)对射血分数保留性心力衰竭(HFpEF)小鼠心功能障碍、心肌重构、心肌线粒体结构及功能、心肌氧化应激反应、心肌能量代谢的改善及对血清和心肌组织FGF21水平的调节作用,以探讨TRF对HFpEF心肌损伤的改善作用及机制。方法30只成纤维细胞生长因子21(FGF21)敲除(Fgf21^(-/-))小鼠均分为FGF21敲除自由进食(ALb)组和FGF21敲除TRF组,30只野生型(WT)小鼠均分为野生ALb组、野生TRF组。上述四组均给予60%高脂饲料,并且在每日饮水中加入Nω-硝基-L-精氨酸甲酯盐酸盐(L-NAME,0.5 g/L)建立HFpEF模型。野生TRF组和FGF21敲除TRF组小鼠接受TRF,每晚21:00至次日5:00进食,其余时间禁食;野生ALb组和FGF21敲除ALb组小鼠24 h均开放进食。四组均喂养8周,观察小鼠心肌损伤相关指标:心脏功能(LVEF、E/A、E/E'、BNP)、心肌重构情况(心肌肥厚程度相关指标心脏指数HW/TL、心肌细胞平均横截面积,心肌纤维化程度相关指标心肌胶原沉积程度及心肌纤维化相关基因Col1a1、Col3a1、Fn1和CTGF mRNA)、心肌线粒体结构及功能(损伤线粒体比、ATP生成量、心肌ATP含量、复合物Ⅰ活性、复合物Ⅴ活性)、心肌氧化应激水平(ROS、SOD活性,MDA含量)、心肌能量代谢情况(脂肪酸氧化关键分子CD36、CPT1b及13C Ac-CoA百分比,葡萄糖代谢相关基因Glut1、Glut4、PFK1 mRNA表达水平)以及血清、心肌组织FGF21表达水平。结果各组喂养8周时,与野生ALb组相比,野生TRF组小鼠E/A、E/E′值及血清BNP水平降低(P均<0.01);心脏质量、HW/TL值及心肌细胞平均横截面积降低(P均<0.01);心脏左室胶原占比及Col1a1、Col3a1、Fn1、CTGF mRNA表达降低(P均<0.01);心肌损伤线粒体占比减小,线粒体ATP生成量、线粒体复合物Ⅰ和Ⅴ活性升高(P均<0.01);心肌ROS生成及MDA含量减少,SOD活性升高(P均<0.01);心肌CD36和CPT1b表达升高,^(13)C Ac-CoA百分比上升(P均<0.01);心肌Glut 1、Glut 4和PFK 1 mRNA表达降低(P均<0.01);血清FGF21水平、心肌FGF21蛋白及mRNA表达均增加(P均<0.01)。与野生TRF组相比,FGF21敲除TRF组小鼠E/A、E/E′值及血清BNP水平升高(P均<0.01);心脏质量、HW/TL值及心肌细胞平均横截面积增加(P均<0.01);心脏左室胶原占比及Col1a1、Col3a1、Fn1、CTGF mRNA表达增加(P均<0.01);心肌损伤线粒体占比增加,ATP生成量、复合物Ⅰ和Ⅴ活性降低(P均<0.01);心肌ROS生成及MDA含量增多,SOD活性下降(P均<0.01);心肌CD36和CPT1b表达减少,^(13)C Ac-CoA百分比下降(P均<0.01);心肌Glut 1、Glut 4和PFK 1 mRNA表达增加(P均<0.01)。结论TRF对HFpEF小鼠的心脏功能及心肌重构、心肌线粒体结构及功能、心肌氧化应激反应、心肌能量代谢均具有改善作用,且可促进FGF21的表达;TRF可通过提高FGF21表达水平,进而增强心肌脂肪酸代谢、改善心肌线粒体结构功能并抑制氧化应激水平,改善HFpEF小鼠的心功能障碍及心肌重构,从而改善心肌损伤。

miRNA-21-5p对光诱导的人视网膜色素上皮细胞氧化应激损伤的影响

目的研究miRNA-21-5p对光诱导的人视网膜色素上皮细胞氧化应激损伤的影响。方法将体外培养的人视网膜色素上皮细胞系ARPE-19细胞随机分为对照组(TransIntro EL Transfection Reagent转染液培养)、损伤组(TransIntro EL Transfection Reagent转染液+光损伤)、过表达组(TransIntro EL Transfection Reagent转染液+miRNA-21-5p mimics+光损伤)、阴性组(TransIntro EL Transfection Reagent转染液+miRNA-21-5p mimics NC+光损伤)、PI3K/Akt阻断剂组(TransIntro EL Transfection Reagent转染液+miRNA-21-5p mimics+LY294002+光损伤)。使用光照强度为(16500±200)lx的LED冷光灯建立ARPE-19细胞光损伤模型,利用TransIntro EL Transfection Reagent转染液行细胞转染。采用qRT-PCR法检测各组ARPE-19细胞miRNA-21-5p表达水平,采用CCK-8法检测各组ARPE-19细胞活力,流式细胞仪检测各组ARPE-19细胞活性氧(ROS)含量变化,ELISA法检测各组ARPE-19细胞超氧化物歧化酶(SOD)活性和丙二醛(MDA)含量。结果与对照组相比,损伤组ARPE-19细胞miRNA-21-5p表达明显下降,细胞存活率明显下降,ROS含量显著升高,SOD活性明显降低,MDA含量明显增加(均为P<0.001);与损伤组相比,过表达组ARPE-19细胞miRNA-21-5p表达明显升高,细胞存活率明显上升,ROS含量明显降低,SOD活性升高,MDA含量减少(均为P<0.001),而阴性组ARPE-19细胞miRNA-21-5p表达、细胞存活率、ROS含量、SOD活性、MDA含量均无明显差异(均为P>0.05);与过表达组相比,PI3K/Akt阻断剂组ARPE-19细胞miRNA-21-5p表达明显降低,细胞存活率明显下降,ROS含量明显升高,SOD活性明显降低,MDA含量明显增加(均为P<0.01)。结论miRNA-21-5p能显著降低光诱导的ARPE-19细胞氧化应激水平,提高光诱导的ARPE-19细胞抗氧化能力。

石胆酸通过上调miR-21表达降低核受体PPARαmRNA的稳定性

目的探讨石胆酸在转录后水平对PPARαmRNA稳定性的调控。方法构建PPARα3'UTR荧光素酶报告基因载体并转染HepG2细胞,比较两种浓度石胆酸处理后荧光素酶活性的变化。结合生物信息学预测,确定石胆酸诱导下差异表达的miRNAs及其在3'UTR上的潜在结合位点,对结合位点进行突变(Mut1、Mut2和Mut1+Mut2),比较石胆酸处理后Mut1、Mut2和Mut1+Mut2荧光素酶活性的变化。利用Westernblot和RT-qPCR检测两种浓度石胆酸处理下信号通路的激活及其下游转录因子基因表达水平,比较不转染对照组和瞬时转染过表达转录因子的PPARα蛋白表达,确定参与石胆酸调控PPARαmRNA稳定性的信号通路和转录因子。结果与对照组相比,100μmol/L石胆酸诱导3'UTR1和3'UTR2片段荧光素酶活力均显著下降超过50%(P<0.01)。miRNAPCRarray筛选发现石胆酸诱导miR-21和miR-22差异表达,100μmol/L石胆酸诱导miR-21表达上调2.35倍(P<0.05)。定点突变3'UTR1中两个预测的miR-21位点,构建了Mut1、Mut2和Mut1+Mut2报告基因载体。相对于对照组,石胆酸下调3'UTR1荧光素酶活性51%,而Mut1、Mut2和Mut1+Mut2分别被下调37%、39%、13%。Westernblot显示石胆酸磷酸化ERK1/2,激活ERK1/2信号通路;100μmol/L石胆酸上调转录因子EGR1基因表达水平5.83倍(P<0.01);瞬时转染过表达EGR1显著下调PPARα蛋白水平(P<0.05)。结论石胆酸通过激活肝细胞中ERK1/2信号通路,诱导早期生长应答因子EGR1和miR-21的表达上调,使miR-21作用于3'UTR调控区,降低PPARαmRNA的稳定性,从而减少PPARα基因和蛋白表达水平。

Macroscopic,thermodynamic,kinetic and microscopic study of nitric acid pickling of Elektron 21(EV31A)magnesium alloy

The study of pickling of the EL21T6 substrate in a nitric acid bath firstly provided knowledge of the influence of the different experimental parameters(concentration of acid,temperature and stirring of the solution)in relation to the etching rate.This experimental part led to the choice of standard pickling(T_(bath)=25℃,moderate stirring(250 rpm),[HNO_(3)]=1.20 mol/L,duration of 2 min)so as to obtain constant removal of material,even after several uses of the pickling bath.SEM observations also confirmed that in these operating conditions,pickling concerns both the grains of the matrix and the precipitates of type Mg3(Nd,Gd),leading to uniform removal of material from the surface.Working from a number of assumptions,thermodynamic and chemical kinetic studies then allowed a pickling mechanism to be proposed and led to obtaining values for the corresponding kinetic parameters(order of reaction,constant of mean rate,activation energy)to be obtained.

Exogenous acid fibroblast growth factor inhibits ischemia-reperfusion-induced damage in intestinal epithelium via regulating P53 and P21WAF-1 expression

AIM： To detect the effect of acid fibroblast growth factor （aFGF） on P53 and P21WAF-1 expression in rat intestine after ischemia-reperfusion （I-R） injury in order to explore the protective mechanisms of aFGF. METHODS： Hale rats were randomly divided into four groups, namely intestinal ischemia-reperfusion group （R）, aFGF treatment group （A）, intestinal ischemia group （I）, and sham-operated control group （C）. In group I, the animals were killed after 45 min of superior mesenteric artery （SHA） occlusion. In groups R and A, the rats sustained for 45 min of SHA occlusion and were treated with normal saline （0.15 mL） and aFGF （20 μg/kg, 0.15 mL）, then sustained at various times for up to 48 h after reperfusion. In group C, SHA was separated, but without occlusion. Apoptosis in intestinal villi was determined with terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick-end labeling technique （TUNEL）. Intestinal tissue samples were taken not only for RT- PCR to detect P53 and P21WAF-1 gene expression, but also for immunohistochemical analysis to detect P53 and P21WAF-1 protein expression and distribution. RESULTS： In histopathological study, ameliorated intestinal structures were observed at 2, 6, and 12 h after reperfusion in A group compared to R group. The apoptotic rates were （41.17±3.49）%, （42.83±5.23）%, and （53.33±6.92）% at 2, 6, and 12 h after reperfusion, respectively in A group, which were apparently lower than those in R group at their matched time points （50.67±6.95）%, （54.17±7.86）%, and （64.33±6.47）%, respectively, （P〈0.05））. The protein contents of P53 and P21WAF-1 were both significantly decreased in A group compared to R group （P〈0.05） at 2-12 h after reperfusion, while the mRNA levels of P53 and P21VVAF-1 in A group were obviously lower than those in R group at 6-12 h after reperfusion （P〈0.05）. CONCLUSION： P53 and P21WAF-1 protein accumulations are associated with intestinal barrier injury induced by I-R insult, while intravenous aFGF can alleviate apoptosis of rat intestinal cells by inhibiting P53 and P21WAF-1 protein expression.

A promoting nitric oxide-releasing coating containing copper ion on ZE21B alloy for potential vascular stent application

Magnesium-based biodegradable metals as cardiovascular stents have shown a lot of excellent performance, which have been used to treat coronary artery diseases. However, the excessive degradation rate, imperfect biocompatibility and delayed re-endothelialization still lead to a considerable challenge for its application. In this work, to overcome these shortcomings, a compound of catalyzing nitric oxide(NO) generation containing copper ions(Cu^(2+)) and hyaluronic acid(HA), an important component of the extracellular matrix, were covalently immobilized on a hydrofluoric acid(HF)-pretreated ZE21B alloy via amination layer for improving its corrosion resistance and endothelialization. Specifically,the Cu^(2+) chelated firmly with a cyclen 1,4,7,10-tetraazacyclododecane-N’, N’’, N’’’, N-tetraacetic acid(DOTA) could form a stability of hybrid coating, avoiding the explosion of Cu^(2+). The chelated Cu^(2+) enabled the catalytic generation of NO and promoted the adhesion and proliferation of endothelial cells(ECs) in vascular micro-environment. In this case, the synergistic effect of NO-generation and endothelial glycocalyx molecules of HA lead to efficient ECs promotion and smooth muscle cells(SMCs) inhibition. Meanwhile, the blood compatibility also had achieved a marked improvement. Moreover, the standard electrochemical measurements indicated that the functionalized ZE21B alloy had better anti-corrosion ability. In a conclusion, the dual-functional coating displays a great potential in the field of biodegradable magnesium-based implantable cardiovascular stents.

Acid-base behavior of cryptand 1, 4, 7, 10, 13, 16, 21, 24-octaaza-bicyclo [8, 8, 8] hexacosan-3, 8, 12, 17, 20, 25-hexone and complex formation

The bicyclic cryptand 1,4,7, 10,13,16,21, 24-octaaza-bigcyclo [8, 8,8] hexacosan-3, 8, 12, 17, 20, 25-hex-one (COBH) bearing diaminoethane groups along the eight-atom bridges was synthesized. The structure consists of discrete neutral macrobicyclic units; the two cycles share the two tertiary amine nitrogen atoms, which exhibit an endo-cndo conformation. Three identical branches formed by 1, 2-diaminoethane link the two tertiary amine groups. The protonation reactions of cryptand (COBH) and its complex formation with copper (II) were investigated by potentiometry in water and in a DMSO/water (80:20 in mass ratio) mixture as solvents. The cryptand acts as a his-base through its two N-bridgehead and exhibits a strong cooperativity that favors the first protonation and makes the second one difficult (△pK= 5.0). An inward rotation of the amide groups to form hydrogen bonds accounts for this cooperativity. The interaction of COBH with copper (II) leads to several binuclear complex proton contents.

miR-10a、miR-21联合预测老年重症脓毒症患者的病死率

目的:探究miR-10a、miR-21联合预测老年重症脓毒症患者28 d病死率的价值。方法:回顾102例老年重症脓毒症患者的资料,根据预后情况分为死亡组和存活组。比较2组入院时外周血miR-10a、miR-21,分析死亡的影响因素、APACHEⅡ评分与外周血miR-10a、miR-21的相关性及miR-10a、miR-21联合预测患者病死的效能。结果:28 d病死率为28.43%;死亡组外周血miR-10a、miR-21表达水平显著高于存活组(P<0.05);APACHEⅡ评分≥20分、CRP≥40 mg/ml、血清乳酸≥3 mmol/L、外周血miR-10a表达水平≥1.31、外周血miR-21表达水平≥2.39是老年重症脓毒症患者28 d病死的独立危险因素,Vit D>26 ng/ml是其保护因素;APACHⅡ评分与外周血miR-10a、miR-21无相关性(P>0.05);外周血miR-10a联合miR-21预测老年重症脓毒症患者28 d病死率的特异度、AUC均高于单独预测。结论:老年重症脓毒症患者28 d内病死率高,需根据影响因素加强防控,外周血miR-10a联合miR-21有理想的预测效能。

微小核糖核酸-21对人舌鳞状细胞癌细胞系生物学特性的影响

目的研究微小核糖核酸-21(miR-21)对人舌鳞状细胞癌细胞系生物学特性的影响。方法将2’O-Me修饰的正义和反义miR-21寡核苷酸序列通过脂质体转染技术转染到舌鳞状细胞癌细胞Tca8113及其高转移株内,采用实时荧光定量聚合酶链式反应检测转染后miR-21在细胞中的表达变化,通过甲基噻唑基四唑(MTT)法、流式细胞术、AnnexinⅤ细胞早期凋亡检测、划痕实验及Transwell实验分别检测细胞增殖能力、细胞周期、细胞早期凋亡情况、细胞迁移及侵袭能力的变化。结果靶向miR-21的反义寡核苷酸可以有效地抑制Tca8113及其高转移株细胞的增殖,促进细胞凋亡,并抑制细胞的迁移和侵袭能力。结论细胞内转染反义miR-21寡核苷酸序列后,可以降低舌鳞状细胞癌细胞中miR-21的表达,并对舌鳞状细胞癌细胞的生物学行为产生影响。

西瓜根系分泌物中氨基酸组分对多黏类芽孢杆菌SQR-21趋化性及根际定殖的影响

[目的]根系分泌物介导的微生物趋化性是植物促生细菌根际定殖及功能发挥的重要前提,深入理解该过程对指导促生菌的合理施用具有重要意义。[方法]通过氨基酸分析仪鉴定西瓜根系分泌物中的主要氨基酸组分,并通过滴定分析法(drop assay)和类毛细管法比较促生多黏类芽孢杆菌SQR-21对不同氨基酸组分的趋化性,最终通过原位试验研究外源添加氨基酸对菌株SQR-21在西瓜根际定殖的影响。[结果]西瓜根系分泌物中包含天冬氨酸、苏氨酸、甘氨酸、半胱氨酸、缬氨酸、甲硫氨酸、异亮氨酸、亮氨酸、酪氨酸、苯丙氨酸、组氨酸、赖氨酸和精氨酸。滴定分析法表明:菌株SQR-21对上述13种氨基酸中除甲硫氨酸和酪氨酸以外的11种氨基酸均存在趋化性,其中对苏氨酸、精氨酸、组氨酸和苯丙氨酸的趋化性较强;类毛细管定量试验进一步表明:菌株SQR-21对不同浓度氨基酸的响应不同,菌株SQR-21对中等浓度的氨基酸(40~80μmol·L^(-1))表现出较强的趋化性,其中对精氨酸、组氨酸和苯丙氨酸具有强烈的正趋化作用。综合考虑滴定分析试验和类毛细管试验的结果,设计试验研究原位外源添加精氨酸、组氨酸和苯丙氨酸对菌株SQR-21根际定殖的影响,结果表明60μmol·L^(-1)的精氨酸、组氨酸和苯丙氨酸均能明显促进菌株SQR-21在西瓜根际的定殖,进一步验证了菌株SQR-21对这3种氨基酸的趋化作用。[结论]西瓜根系分泌物中的精氨酸、组氨酸和苯丙氨酸可诱导菌株SQR-21对西瓜根系的趋化性并促进其在西瓜根际有效定殖。

乌索酸通过抑制miR-21表达诱导肝癌HepG2细胞凋亡的机制

探讨乌索酸通过调控miR-21表达从而诱导肝癌HepG2细胞凋亡的作用机制。采用MTT方法检测乌索酸对肝癌细胞增殖的抑制作用;qPCR检测肝癌细胞中miR-21的表达水平及乌索酸对HepG2细胞中miR-21表达的调控作用;转染miR-21 mimics进HepG2细胞中上调miR-21的表达后,MTT、流式细胞检测法、RT-PCR方法分别分析miR-21在乌索酸对细胞的增殖、凋亡以及对凋亡相关基因的调控过程中的作用。结果显示,与肝正常细胞L-02以及肝癌SMCC-7721、Bel-7402细胞相比较,乌索酸对肝癌HepG2细胞的增殖抑制效果最强,且HepG2细胞中miR-21的表达水平最高。乌索酸可下调HepG2细胞中miR-21的表达,且在24 h的下调作用最强。miR-21的表达上调可以部分抵消乌索酸对HepG2细胞的抑制增殖及促进凋亡,部分抵消下调凋亡抑制基因Bcl-2、survivin表达和上调促凋亡基因Bax表达的作用。结果提示,乌索酸通过抑制miR-21的表达诱导肝癌HepG2细胞凋亡。

FGF-21与罗格列酮钠对棕榈酸诱导的胰岛细胞株凋亡的保护作用及机制研究

目的探讨成纤维细胞生长因子-21(FGF-21)和罗格列酮钠(RO)对棕榈酸(PA)诱导的HIT-T15胰岛细胞凋亡的保护作用和机制。方法①0.25、0.50和1.00 mmol/L的PA干预HIT-T15细胞24 h,流式细胞仪检测细胞凋亡。②在0.50 mmol/L的PA中分别加入FGF-21〔12.50 nmol/L(A)、25.00 nmol/L(B)、50.00 nmol/L(C)〕、1μmol/L RO及3个不同浓度的FGF-21与RO联合,检测细胞凋亡,免疫细胞化学法、Western blot检测各组细胞磷酸化c-jun氨基末端激酶(p-JNK)的表达。结果①PA组细胞凋亡高于对照组(P<0.05)。②FGF-21 A、B、C组能明显降低0.50 mmol/L PA诱导的凋亡(P<0.05),但凋亡率高于对照组(P<0.05)。FGF-21与RO联合干预组的细胞凋亡低于PA组(P<0.05)。联合干预组的细胞凋亡低于单用FGF-21组(P<0.05)。③0.50 mmol/L PA组的p-JNK蛋白表达高于对照组(P<0.05)。不同浓度FGF-21组的p-JNK的表达均低于PA组(P<0.05)。FGF-21与RO联合干预组的p-JNK均低于PA组(P<0.05)。联合干预组p-JNK的表达低于单用FGF-21组(P<0.05)。结论①PA可剂量依赖性的诱导HIT-T15胰岛细胞的凋亡。②FGF-21能抑制PA诱导的HIT-T15胰岛细胞株的凋亡,此机制可能是抑制了p-JNK的表达,并且与RO有协同作用。

日本血吸虫SjC21.7核酸疫苗诱导小鼠保护性免疫作用的研究

目的 研究日本血吸虫中国大陆株 2 1.7k Da膜蛋白分子 (Sj C2 1.7)核酸疫苗对 BAL B/ c小鼠的免疫保护性作用。 方法 采用 PCR方法扩增出特异性 Sj C2 1.7基因的开放阅读框序列 ,在其起始密码子处引入 Kozark序列。将目的基因片段亚克隆到真核表达质粒 pc DNA3.1中 ,构建重组真核表达质粒 Sj C2 1.7- pc DNA3.1。 4 8只 BAL B/ c小鼠分为对照组、实验组和加强组。对照组小鼠的股四头肌注射接种 pc DNA3.1,实验组同法注射重组质粒 Sj C2 1.7- pc D-NA3.1,加强组除注射重组质粒 Sj C2 1.7- pc DNA3.1外 ,同时注射重组质粒 P35 - pc DNA3.1及 P4 0 - pc DNA。每隔 2 wk免疫 1次 ,共免疫 3次。第 3次免疫后第 30天 ,每只鼠感染 4 5± 1条尾蚴 ,4 5 d后剖杀计数各组小鼠成虫数及肝卵数。通过 EL ISA和免疫组化分析观察小鼠免疫学特征的变化。 结果 免疫组化分析显示 ,实验组小鼠股四头肌局部组织有特异性抗原蛋白表达。EL ISA分析表明 ,免疫后实验组和加强组有部分小鼠出现特异性 Ig G抗体。与对照组比较 ,实验组减虫率及减卵率分别为 2 9.9%及 13.8% ,加强组分别为 31.9%及 2 8.0 %。加强组减卵率显著高于实验组(P<0 .0 5 )。 结论 Sj C2 1.7核酸疫苗能诱导 BAL B/

miR-21、Caveolin-1、Gal-9在病毒性脑炎患者的表达及相关性研究

目的探讨病毒性脑炎(viral meningitis,VM)患者脑脊液微小核糖核酸21(micro ribonucleic acid-21,miR-21)表达、陷窝蛋白1(Caveolin-1)、半乳糖凝集素9(galectin-9,Gal-9)水平特点,分析miR-21、Caveolin-1、Gal-9与VM复发的关系。方法选择VM患者(VM组)132例和经检查证实无神经系统损伤的患者(对照组)136例。根据病情将VM患者分为重症组(58例)和轻症组(74例),所有患者出院后随访3个月,根据是否VM复发分为复发组(26例)和无复发组(106例)。治疗前后检测血清miR-21表达、Caveolin-1、Gal-9以及炎性因子水平,分析miR-21、Caveolin-1、Gal-9与VM病情、炎性因子以及复发的关系,受试者工作特征曲线(receiver-operating characteristic curve,ROC)分析miR-21、Caveolin-1、Gal-9预测VM复发的价值。结果VM组miR-21表达、Caveolin-1、Gal-9、肿瘤坏死因子α(tumor necrosis factor-α,TNF-α)、白细胞介素6(interleukin-6,IL-6)水平高于对照组(P<0.05)。重症组VM患者脑脊液miR-21表达、Caveolin-1、Gal-9、TNF-α、IL-6水平高于轻症组(P<0.05)。miR-21、Caveolin-1、Gal-9水平均与TNF-α、IL-6呈正相关(P<0.05)。治疗前和治疗前后,复发组脑脊液miR-21表达、Caveolin-1、Gal-9、TNF-α、IL-6水平均高于无复发组,复发组和无复发组患者治疗后脑脊液miR-21表达、Caveolin-1、Gal-9、TNF-α、IL-6水平低于治疗前(P<0.05)。治疗后高TNF-α、miR-21、Caveolin-1、Gal-9是VM复发的危险因素(P<0.05)。联合检测治疗后miR-21、Caveolin-1、Gal-9预测VM复发的AUC为0.858,大于单项指标预测(P<0.05)。结论VM患者脑脊液中miR-21表达、Caveolin-1、Gal-9水平明显增加,治疗后高表达miR-21、高水平Caveolin-1、Gal-9与VM病情严重程度以及复发密切相关。

微小核糖核酸-21反义寡核苷酸对人舌鳞癌细胞生长抑制的体内研究

目的研究微小核糖核酸-21(miR-21)反义寡核苷酸(AS-miR-21)对人舌鳞癌生长的抑制作用。方法采用稳定转染pGL6荧光素酶报告基因质粒的舌鳞癌细胞Tca8113-luc接种裸鼠,建立移植瘤动物模型,瘤体内注射AS-miR-21,应用活体成像和TUNEL等实验技术进行AS-miR-21对人舌鳞癌细胞系生长抑制的体内研究。结果通过转染pGL6荧光素酶报告基因质粒构建了稳定表达荧光素酶活性的Tca8113-luc细胞株。裸鼠皮下荷瘤模型成瘤率高,肿瘤生长稳定。在瘤体内注射AS-miR-21后肿瘤生长减慢,活体成像中光子数偏低,肿瘤标本中坏死灶少见,细胞核变小,染色变浅,异型性减低,新生血管数减少。肿瘤组织中miR-21表达明显下降,凋亡指数升高。结论肿瘤内注射AS-miR-21可以降低舌鳞癌细胞中miR-21的表达,促进舌鳞癌肿瘤细胞凋亡,抑制肿瘤的生长。

男性高尿酸血症患者不同糖耐量状态下成纤维细胞因子21与血尿酸的关系

目的分析男性高尿酸血症(HUA)患者不同糖耐量状态下血清成纤维细胞因子21(FGF21)水平的变化及与血尿酸(SUA)的关系。方法 98例HUA男性患者纳入HUA组,并根据血糖情况分为HUANGT亚组(正常糖耐量,30例)、HUA-IGR亚组(糖调节受损,32例)及HUA-T2DM亚组(2型糖尿病,36例)。90例体检健康男性纳入对照组。检测所有研究对象FGF21、糖化血红蛋白(HbA1c)、空腹血糖(FPG)、餐后2h血糖(2hPG)、血压、血脂、胰岛素抵抗指数自然对数[ln(HOMA-IR)]、腰臀比(WHR)、空腹胰岛素(FINS)等指标。结果 HUA组、对照组FGF21水平分别为(1.99±0.97)、(1.73±0.45)ng/mL,HUA组明显高于对照组,差异有统计学意义(P<0.05)。HUA-T2DM亚组、HUA-IGR亚组、HUA-NGT亚组FGF21水平分别为(2.61±0.45)、(1.89±0.71)、(1.01±0.69)ng/mL,HUA-T2DM亚组、HUA-IGR亚组均明显高于HUANGT亚组,差异有统计学意义(P<0.05)。FGF21水平与FPG、2hPG、HbA1c、WHR、三酰甘油、ln(HOMAIR)、FINS、SUA呈正相关(r=0.558、0.478、0.387、0.401、0.334、0.256、0.220、0.221,P<0.05)。FPG、2hPG、WHR、SUA、ln(HOMA-IR)、三酰甘油是FGF21的独立影响因素(P<0.05)。结论男性HUA患者FGF21水平升高,FGF21可能参与了男性HUA患者糖代谢调节。