大鼠过氧化物酶体增生因子活化受体α基因重组腺病毒载体及在乳鼠心肌细胞中的表达

背景：过氧化物酶体增生因子活化受体α是调节心脏脂肪酸氧化的重要核转录因子,利用基因工程技术构建其重组腺病毒载体对研究心脏能量代谢障碍机制具有重要意义。 目的：构建大鼠过氧化物酶体增生因子活化受体α基因重组腺病毒载体,评价其在原代培养的乳鼠心肌细胞中的表达效率。 方法：采用RT-PCR法自SD大鼠肝脏扩增过氧化物酶体增生因子活化受体α基因,将其克隆至带有增强型绿色荧光蛋白的穿梭质粒载体pAd-Track-CMV。线性化重组穿梭质粒载体并转化入含有腺病毒骨架质粒pAd-Easy-1的感受态大肠杆菌BJ5183构建重组腺病毒载体质粒。用脂质体将线性化的重组腺病毒载体质粒转染于人胚肾293细胞以包装、扩增,纯化病毒后计算滴度。用纯化的重组腺病毒转染心肌细胞,荧光显微镜观察转染效率;荧光定量PCR、免疫印迹法检测细胞过氧化物酶体增生因子活化受体α mRNA、蛋白表达。 结果与结论：成功构建携带大鼠过氧化物酶体增生因子活化受体α基因的重组腺病毒载体,病毒滴度为3.5×10¹¹ pfu/L。重组腺病毒转染心肌细胞的效率达90%以上,被转染细胞目的基因mRNA、蛋白表达显著增高。该载体的成功构建为研究过氧化物酶体增生因子活化受体α基因在心肌能量代谢障碍中的作用奠定基础。     

大鼠microRNA-327重组腺病毒载体的构建及其在心肌细胞的转染效率

目的:构建含微小RNA-327(miRNA-327)基因的腺病毒载体,并观察其在H9C2心肌细胞中的转染效率。方法:利用聚合酶链反应(PCR)法钓取目的基因miRNA-327,并将目的基因与穿梭载体GV202连接形成miRNA-327腺病毒表达载体。经酶切及测序鉴定后,将构建的miRNA-327腺病毒表达载体与包装质粒共转染到人胚肾293细胞,再通过Cre/loxP重组酶系统以获得重组腺病毒,并对其进行扩增、纯化及滴度测定。最后将构建成功的重组腺病毒载体转染H9C2心肌细胞48 h,并通过荧光显微镜以及流式细胞仪测定其转染效率。结果:双酶切与测序结果证明了大鼠miRNA-327腺病毒载体构建成功,且最终获得滴度为2×10~(10)PFU/ml的病毒液。转染心肌细胞48h后倒置荧光显微镜观察结果显示,腺病毒转染效率为90.15%±5.15%,流式细胞仪检测结果显示其转染效率为85.46%±3.08%。结论:成功构建了含miRNA-327基因的重组腺病毒载体,其在H9C2心肌细胞中具有较高的转染效率。     

新生大鼠心肌细胞和心肌成纤维细胞的同时分离

背景：利用心肌组织中不同细胞的黏附特性差异,通过优化心肌细胞的培养条件,一次分离同时获得心肌和心肌成纤维细胞。 目的：探讨新生大鼠心肌和心肌成纤维细胞同时分离的有效方法。 方法：采用低浓度胰蛋白酶冷消化结合胶原酶复合消化,差速分离心肌和心肌成纤维细胞。通过使用不同种类的血清改良心肌细胞培养条件,免疫荧光鉴定心肌细胞和心肌成纤维细胞纯度。 结果与结论：心肌培养48 h时Troponin T阳性细胞率为89.3%。第2代的心肌成纤维细胞培养波形蛋白阳性细胞率为93.6%。含马血清的培养基组心肌细胞阳性率明显高于牛血清培养组(P < 0.05)。实验应用的新生大鼠心肌细胞分离培养方法,心肌细胞和心肌成纤维细胞纯度高、活性好,且能同时获得心肌细胞和心肌成纤维细胞。     

不同时间移植人脐血CD34+细胞可影响心肌梗死大鼠心功能及血管内皮细胞生长因子的分泌

背景：干细胞移植可以改善心脏功能,改善预后。 目的：观察不同时间经静脉移植人脐血CD34+细胞对心肌梗死大鼠心功能及细胞因子分泌的影响。 方法：结扎冠状动脉左前降支制备Wistar大鼠心肌梗死模型,于梗死后1,5,10 ,30 d经尾静脉注入0.5 mL人脐血CD34+细胞(实验组)或磷酸盐缓冲溶液(对照组)。 结果与结论：与对照组相比,梗死后5,10 d实验组大鼠左室射血分数明显升高(P < 0.05),左室收缩末内径明显减小(P < 0.05),左室后壁增厚率更高(P < 0.05),毛细血管密度明显增加(P < 0.05),且以梗死后10 d移植大鼠心功能改善效果最明显(P < 0.05)。梗死后10 d实验组心肌局部血管内皮细胞生长因子最高(P < 0.05)。说明大鼠心肌梗死后5,10 d经静脉移植脐血CD34⁺细胞可明显改善心功能,梗死后10 d移植血管内皮细胞生长因子分泌更多,血管生成更多,对心功能的改善更明显;同时说明脐血单个核细胞移植可能是通过增加血管内皮细胞生长因子分泌,提高毛细血管密度来改善心功能的。     

川芎嗪和siRNA沉默转化生长因子β1干预大鼠肝星状细胞 结缔组织生长因子的表达

背景：作者前期研究发现川芎嗪可以通过抑制肝星状细胞的增殖、阻抑p38MARK信号通路、下调结缔组织生长因子的表达等多途径发挥抗肝纤维化的作用。一般认为转化生长因子β1是促进纤维化发生最重要的细胞因子,结缔组织生长因子是转化生长因子β1的下游效应介质,siRNA靶向抑制转化生长因子β1可能成为治疗肝纤维化的新方法。 目的：观察川芎嗪及化学合成的siRNA转化生长因子β1对大鼠肝星状细胞结缔组织生长因子表达的影响。 方法：体外培养大鼠肝星状细胞,从3条siRNA转化生长因子β1中筛选一条有效的基因沉默片段,然后利用脂质体转染试剂共同转染培养24 h的细胞作为转染组,并设计空白对照组、转染试剂组、川芎嗪组及联合治疗组。 结果与结论：与空白对照组相比,转染组、川芎嗪组、联合治疗组Ⅰ、Ⅲ型胶原及结缔组织生长因子mRNA表达均下调(P < 0.05)。在转染组、川芎嗪组及联合治疗组,结缔组织生长因子蛋白表达均下调(P < 0.05);培养上清液中Ⅰ型胶原和Ⅲ型胶原含量均降低(P < 0.05)。结果表明,siRNA 沉默转化生长因子β1基因能下调结缔组织生长因子的表达,减少Ⅰ、Ⅲ型胶原的表达。川芎嗪也能下调结缔组织生长因子的表达,但对Ⅰ、Ⅲ型胶原表达的抑制作用更加显著,提示川芎嗪抗肝纤维化可能是多种作用靶点。     

Pax-8 基因真核表达载体的构建及其功能的初步研究

目的: 构建大鼠 Pax-8 基因全长序列的真核表达载体pcDNA3.1(+),并将重组质粒转染至心肌细胞系H9c2中进行表达,测定转染后 Pax-8 基因对心肌细胞增殖及凋亡的影响。方法: 酶切pCMV sport6- Pax-8 获得大鼠 Pax-8 全长基因,通过基因重组技术将其插入到真核表达载体pcDNA3.1(+)中,构建重组质粒pcDNA3.1(+)-Pax-8。限制性酶切鉴定和DNA测序鉴定插入片段。将重组质粒经脂质体法转染至大鼠心肌细胞系H9c2细胞中,RT-PCR法及Western blotting法分别检测转染后Pax-8 mRNA及蛋白表达水平。CCK-8法检测细胞增殖;以血清饥饿诱导心肌细胞凋亡,同时进行 Pax-8 质粒转染,流式细胞仪检测细胞凋亡指数,Western blotting法检测活化caspase-3的表达。结果: 成功构建了大鼠pcDNA3.1(+)-Pax-8真核表达载体,且证实转染后心肌细胞的 Pax-8 mRNA 及蛋白表达均明显高于空白对照组(P<0.05)及空质粒组(P<0.05)。转染 Pax-8 基因能提高心肌细胞的增殖能力(P<0.05),明显抑制血清饥饿引起的细胞凋亡(P<0.01),同时下调活化caspase-3的表达(P<0.01)。结论: 通过基因重组技术成功使得 Pax-8 基因在心肌细胞中过表达。 Pax-8 基因可能通过促进心肌细胞增殖及抑制心肌细胞凋亡从而参与胚胎心脏发育的过程。     

吲哚胺2，3-二氧化酶转染供体可抑制大鼠肝移植的急性排斥反应

背景：吲哚胺2,3-二氧化酶(indoleamine 2,3-dioxygenase,IDO)表达于免疫特赦器官中,能选择性诱导T细胞免疫耐受。 目的：观察腺病毒相关质粒载体介导IDO转染供体对大鼠肝移植急性排斥反应的抑制作用。 方法：构建携带IDO的重组腺病毒质粒pWCM-IDO,建立PVG/DA大鼠肝移植模型48对,随机分为3组,生理盐水组、pWAV2组、pWCM-IDO组分别腹腔注射生理盐水、pWCM悬液和pWCM-IDO悬液1 mL。 结果与结论：pWCM-IDO可成功转染PVG供体肝脏,PWCM-IDO组生存期和IDO表达明显高于生理盐水组和pWAV2组(P < 0.05~0.01);移植后第4天PWCM-IDO组急性排反应程度明显弱于其他2组。提示IDO的重组腺病毒质粒可成功转染大鼠肝脏,缓解急性排斥反应,但难以持续有效表达,对免疫排斥的抑制作用有限。     

骨髓间充质干细胞中突变型人低氧诱导因子1α真核表达载体的表达

背景：转基因小鼠体内实验证实,重组的低氧诱导因子1α可以促进皮肤形态功能正常的血管新生。 目的：构建能够在常氧条件下同时表达突变型低氧诱导因子1α目的蛋白和绿色荧光蛋白报告分子的新型腺病毒真核表达载体,并转染SD大鼠骨髓间充质干细胞,检测该基因在细胞中的表达情况。 方法：利用Lipofectamine 2000介导将构建成功的重组腺病毒真核表达载体pAd-HIF1αmu- IRES-hrGFP-1转染HEK293A细胞,包装病毒,以最佳感染指数=50将重组腺病毒转染大鼠骨髓间充质干细胞,并设3个对照组,即阳性对照组：转染Ad-CMV-HIF1α-IRES-hrGFP-1;阴性对照组：转染Ad-CMV-IRES-hrGFP-1组;空白组：未转染病毒。 结果与结论：①腺病毒载体成功转染HEK293A细胞,包装成功,细胞内有大量绿色荧光表达。②转染突变型低氧诱导因子1α腺病毒表达载体的细胞在常氧条件下蛋白表达量明显高于转其他3组,3个对照组间差异无显著性意义(P > 0.05)。提示突变型腺病毒真核表达载体Ad-HIF1α-IRES-hrGFP-1在HEK293A内成功包装;突变后低氧诱导因子1α基因能够在常氧条件下大量且高效表达。     

过表达整合素连接激酶促进心脏c-Kit~+细胞的存活和增殖

目的:探讨整合素连接激酶(ILK)过表达对心脏c-Kit~+细胞存活和增殖的影响,以及移植ILK过表达的心脏c-Kit~+细胞改善心肌梗死(MI)大鼠心功能的作用。方法:从新生SD大鼠分离培养心脏c-Kit~+细胞,构建含人ILK全长的腺病毒载体并感染心脏c-Kit~+细胞。感染48 h后,应用细胞计数和CCK-8法测定细胞活力和增殖,并通过Western blot法检测c-Kit~+细胞中增殖相关蛋白cyclin D1和增殖细胞核抗原(PCNA)的表达。40只8周龄SPF级大鼠经冠状动脉结扎建立MI模型,结扎15 min后于梗死区及梗死边缘区分3点通过心肌注射移植心脏c-Kit~+细胞。采用随机数字表法将大鼠分为假手术组(sham组)、心梗+生理盐水注射组(MI组)、心梗+感染空载体的c-Kit~+细胞注射组(Ad-null-c-Kit~+cell组)和心梗+感染携带ILK腺病毒载体的c-Kit~+细胞注射组(ILKc-Kit~+cell组),每组10只。术后2周,免疫组化法检测梗死区和梗死边缘区c-Kit的表达;术后4周,通过血流动力学检测心脏功能。结果:过表达ILK促进了心脏c-Kit~+细胞的存活和增殖(P0.05)。过表达ILK的心脏cKit+细胞中cyclin D1和PCNA的表达明显增加(P0.05)。细胞移植2周后,ILK-c-Kit~+cell组心肌组织中c-Kit表达明显增加(P0.05);细胞移植4周后,ILK-c-Kit~+cell组大鼠心功能改善比Ad-null-c-Kit~+cell组更明显(P0.05)。结论:过表达ILK通过提高cyclin D1和PCNA的表达,促进了心脏c-Kit~+细胞的存活和增殖。ILK-c-Kit~+细胞移植能更好地改善MI大鼠的心功能。     

碱性成纤维细胞生长因子基因转染对人牙周韧带细胞的作用

背景：主要来源于因正畸或阻生拔除的健康牙培养而成的人牙周韧带细胞已成为牙周组织工程理想的种子细胞来源之一。 目的：了解采用重组腺相关病毒作为载体介导碱性成纤维细胞生长因子基因转染对体外培养的人牙周韧带细胞增殖及细胞周期的影响。 方法：体外培养人牙周韧带细胞, 经重组腺相关病毒作为载体介导碱性成纤维细胞生长因子基因转染,分为3组：对照组、空载病毒组、碱性成纤维细胞生长因子转染组。用RT-PCR,Western blot检测人牙周韧带细胞在转染前后碱性成纤维细胞生长因子基因和蛋白的表达。应用细胞生长曲线、四甲基偶氮唑蓝比色法观察细胞生长的优化作用;采用流式细胞术测定细胞周期分布的变化。 结果与结论：对照组、空载病毒组未检测到碱性成纤维细胞生长因子mRNA和蛋白表达;碱性成纤维细胞生长因子转染组碱性成纤维细胞生长因子mRNA和蛋白水平均有表达,细胞的生长速度明显增快,细胞周期G₀/G₁期减少,S期细胞数增多。各组间比较差异有显著性意义(P < 0.05)。     

法舒地尔和RhoA沉默对神经干细胞增殖的影响

背景：Rho及其相关分子在神经轴突生长、分化、延伸及突触形成中起重要作用,阻断和抑制RhoA/ROCK通路可促进神经干细胞的增殖与生长。 目的：观察Rho激酶抑制剂法舒地尔和RNAi介导的RhoA基因沉默对大鼠神经干细胞增殖的影响。 方法：体外培养Wistar胎鼠神经干细胞,分6组干预：空白对照组,5,10,15,20 μmol/L 法舒地尔组,siRNA 沉默RhoA基因组。干预后第3天,采用RT-PCR,Western blot检测各组神经干细胞RhoA基因及蛋白的表达。应用MTT比色法观察神经干细胞增殖情况;采用流式细胞术测定神经干细胞周期分布的变化。 结果与结论：15,20 μmol/L 法舒地尔组、siRNA 沉默RhoA基因组神经干细胞RhoA基因及蛋白表达量较5,10 μmol/L 法舒地尔组、空白对照组明显降低(P< 0.05),细胞的生长速度较5,10 μmol/L 法舒地尔组、空白对照组明显增快(P < 0.05),细胞周期G0/G1期减少(P< 0.05),S期细胞数增多(P< 0.05)。当法舒地尔浓度增加到20 μmol/L时对细胞的作用并非随浓度的增加而增强,与15 μmol/L组的差异无显著性意义(P > 0.05)。15,20 μmol/L 法舒地尔组与siRNA 沉默RhoA基因组相比差异无显著性意义(P> 0.05)。说明Rho激酶抑制剂法舒地尔和RNAi介导的RhoA基因沉默在体外均能促进神经干细胞增殖,法舒地尔最佳作用浓度为15 μmol/L。     

重组腺病毒介导突变型低氧诱导因子1α基因转染脂肪间充质干细胞并促进其增殖

BACKGROUND:To improve the survival rate of transplanted tissue, most scholars focus on cell therapy, particularly cell-assisted fat grafting. OBJECTIVE:To analyze the effect of recombinant adenovirus-mediated hypoxia inducible factor 1alpha (HIF1α) mutant on survival rate of transplanted fat particles through transfection of adipose-derived mesenchymal stem cells. METHODS:Recombinant adenovirus-mediated triple-mutant HIF1α was inserted into an adenovirus pAdEasy-1 system, followed by viral packaging and titer determination. Human adipose-derived mesenchymal stem cells were cultured, passaged and identified, and subsequently transfected with three kinds of viruses and blank vector (experimental group with transfection of the triple mutant of HIF1α; positive control group; negative control group; blank control group). Transfection efficiency was determined using enhanced green fluorescent protein labeling. Additionally, MTT assay was used to detect cell proliferation. RESULTS AND CONCLUSION:The recombinant adenovirus was successfully constructed and packaged in line with transfection requirements. Moreover, adipose-derived mesenchymal stem cells were successfully identified by adipogenic, osteogenic and chondrogenic induction and could be used as seed cells for subsequent experiments. RT-PCR results showed that HIF1α mRNA expression in the experimental group and positive control group was significantly higher than that in the other two groups(P < 0.05). Western blot analysis showed that the relative absorbance value in the experimental group was significantly higher than that in the other three groups (P < 0.05). A significant increase in the cell proliferation was found in the experimental group, significantly different from the other three groups (P < 0.05). Therefore, our findings indicate that transfection of adenovirus-mediated triple-mutant HIF1α not only can sustain the expression of target protein in transfected adipose-derived mesenchymal stem cells under normoxic conditions, but also can promote the proliferation of transfected adipose-derived mesenchymal stem cells.     

低氧增强骨髓间充质干细胞对缺氧诱导心肌细胞凋亡的可能性

背景：骨髓间充质干细胞移植入缺血心肌后存活率低,而低氧有可能增强骨髓间充质干细胞的增殖,促进其存活。 目的：体外模拟心肌细胞缺血微环境,探索低氧预处理后,骨髓间充质干细胞对持续缺氧诱导的心肌细胞凋亡的保护作用。 方法：取第4代SD大鼠骨髓间充质干细胞用于制备条件培养液。取胚胎大鼠心肌细胞株,随机分成4组：对照组：心肌细胞正常培养组;模型组：心肌细胞单纯缺氧;骨髓间充质干细胞组：心肌细胞与骨髓间充质干细胞条件培养液共缺氧;低氧组：心肌细胞与骨髓间充质干细胞低氧条件培养液共缺氧。MTT检测各组细胞活力变化,Annexin V-FITC双染标记心肌细胞凋亡,免疫组化检测各组Bax和Bcl-2蛋白的表达。 结果与结论：免疫组化显示,低氧组的Bcl-2表达较其他各组增强,而Bax的表达比模型组和骨髓间充质干细胞组减弱,Bcl-2/Bax比值最大。与对照组和骨髓间充质干细胞组相比,低氧组的细胞活力高(P < 0.05),凋亡率降低(P < 0.05)。提示低氧可能是通过增强旁分泌机制,从而对Bax和Bcl-2进行调节,对心肌细胞凋亡有保护效应。     

腺病毒介导脑源性神经营养因子与脑出血模型大鼠内源性神经干细胞的分化

BACKGROUND:Previous studies showed that neurotrophic factor has a variety of functions, which can effectively maintain the survival of neurons after injury. OBJECTIVE:To observe the effect of adenovirus-mediated brain-derived neurotrophic factor on the differentiation of endogenous neural stem cells after intracerebral hemorrhage in rats. METHODS:A total of 90 Sprague-Dawley rat models of cerebral hemorrhage were made. At 12 hours after cerebral hemorrhage, 5-bromodeoxyuridine (BrdU) was intraperitoneally injected, twice a day, for 10 consecutive days. After model establishment, rats were randomly divided into three groups, 30 rats in each group, and were respectively subjected to brain stereotaxic injection of adenovirus vector, adenovirus-mediated brain-derived neurotrophic factor and physiological saline. At 1 day, 3 days, 1 week, 2 weeks, 3 weeks, and 4 weeks, neurological deficit score was evaluated. Absorbance value of growth associated protein around the area of hematoma after intracerebral hemorrhage was measured. At 4 weeks after injection, double immunostaining was used to detect the expression of BrdU/NeuN and BrdU/glial fibrillary acidic protein (GFAP).  RESULTS AND CONCLUSION:(1) With the passage of time, nerve function defect score decreased in the three groups. At 1-4 weeks after injection, nerve function deficit scores were lower in the adenovirus-mediated brain-derived neurotrophic factor group than that in the adenovirus vector group and saline group (P < 0.05). (2) With the passage of time, the average absorbance of three groups in the peri-hematoma region first increased and then decreased. The absorbance value was higher in the adenovirus-mediated brain-derived neurotrophic factor group than in the adenovirus vector group and saline group at 3 days-4 weeks (P < 0.05). (3) BrdU/NeuN and BrdU/GFAP rates were significantly higher in the adenovirus-mediated brain-derived neurotrophic factor group than that of adenovirus vector group and saline group (P < 0.05). (4) The results show that the brain-derived neurotrophic factor mediated by adenovirus, and intervention on cerebral hemorrhage in rats can effectively promote the differentiation of endogenous neural stem cells, and promote the recovery of neural function in animal.     

腺病毒介导hRAMP1基因转染血管平滑肌细胞的增殖和凋亡

背景：外源性受体活性修饰蛋白1基因转染可能对血管平滑肌细胞增殖调控具有重要的作用。 目的：探讨腺病毒载体介导人受体活性修饰蛋白1基因对体外培养的兔血管平滑肌细胞增殖和凋亡的影响。 方法：分离培养获得兔主动脉血管平滑肌细胞,分别以携带人受体活性修饰蛋白1基因的腺病毒和空腺病毒转染后,分成人受体活性修饰蛋白1组、空病毒组和对照组。 结果与结论：腺病毒转染细胞后随时间延长,报告基因绿色荧光蛋白表达逐渐增加,72 h表达最强,感染率达80%,96 h时仍有绿色荧光蛋白表达。人受体活性修饰蛋白1组的受体活性修饰蛋白1蛋白表达增加,血管平滑肌细胞凋亡率增加,细胞增殖明显抑制,与空病毒组和对照组比较差异有显著性意义(P < 0.05)。提示人受体活性修饰蛋白1基因感染血管平滑肌细胞后明显抑制血管平滑肌细胞增殖,促进细胞凋亡。     

人脐带间充质干细胞对异位子宫内膜细胞增殖及凋亡的影响

背景：间充质干细胞可以分泌多种细胞因子和生长因子,促进周围细胞的存活,发挥旁分泌作用。 目的：探讨人脐带间充质干细胞对异位子宫内膜细胞增殖及凋亡的影响。 方法：分离培养人脐带间充质干细胞和异位子宫内膜细胞,以异位子宫内膜细胞单独培养作为对照组,人脐带间充质干细胞与异位子宫内膜细胞共培养作为观察组。培养24,48,72 h时采用MTT法检测异位子宫内膜细胞增殖情况,流式细胞仪检测异位子宫内膜细胞凋亡情况,RT-PCR检测异位子宫内膜细胞PTEN基因表达情况。 结果与结论：与对照组比较,培养24,48,72 h时观察组异位子宫内膜细胞增殖受到显著抑制,亚二倍体峰占细胞总数的比例显著升高(P < 0.05)。随着时间的推移,观察组细胞抑制率逐渐下降,各时间点比较差异有显著性意义(P均 < 0.05)。与同期对照组比较,观察组细胞PTEN基因表达显著上调(P < 0.05)。培养48,72 h观察组细胞PTEN基因表达显著高于培养24 h (P < 0.05)。以上结果表明人脐带间充质干细胞可以通过上调PTEN基因表达,抑制异位子宫内膜细胞增殖,并促进其凋亡。中国组织工程研究杂志出版内容重点：干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程     

碱性成纤维细胞生长因子基因真核表达载体转染骨髓间充质干细胞移植治疗糖尿病

BACKGROUND:Existing studies have shown that bone marrow mesenchymal stem cells can significantly improve islet function in diabetic rats to decrease excessively high blood glucose level, which may be related to the enhancement of differentiation ability of autologou pancreatic stem cells. OBJECTIVE:To observe the therapeutic efficacy of basic fibroblast growth factor gene eukaryotic expression vector (PEGFP-C3-BFGF) transfection of bone marrow mesenchymal stem cells in diabetic rats. METHODS:Recombinant adenovirus (Ad.aFGF) mediated PEGFP-C3-BFGF was transfected into bone marrow mesenchymal stem cells, and PEGFP-C3-BFGF expression was observed using fluorescence microscopy. Eighty Sprague-Dawley rats were randomly divided into normal control group, diabetes group, transplantation group, gene transfection group, with 20 rats in each group. After modeling, rats in different groups were given portal vein injection of normal saline, PBS, 1 mL of bone marrow mesenchymal stem cell suspension, and 1 mL of PEGFP-C3-BFGF-transfected bone marrow mesenchymal stem cell suspension. RT-PCR method was used to detect mRNA expression of matrix metalloproteinases in pancreatic tissue of rats in each group. Blood glucose levels of rats were detected at 24 hours, 3, 7, 14, 21 days after transplantation. ELISA method was used to detect plasma insulin levels in rats. Pathological changes of the pancreas were observed using hematoxylin-eosin staining. RESULTS AND CONCLUSION:Under the fluorescence microscope, PEGFP-C3-BFGF transfected into cells after 48 hours showed significant specific red fluorescence. Two weeks after transplantation, matrix metalloproteinases mRNA expression was significantly increased in the diabetes group compared with the control group (P < 0.05), while it was decreased in the transplantation and gene transfection groups compared with the diabetes group (P < 0.05). After transplantation, the blood glucose levels in rats were ranked as follows: control group < gene transfection group < transplantation group < diabetes group (P < 0.05), and the plasma insulin levels in rats ranked as follows: control group > gene transfection group > transplantation group > diabetes group (P < 0.05). Pathological findings of the pancreas showed that the transplantation group was superior to the diabetes group, but inferior to the gene transfection group that was similar to the control group. All these findings indicate that PEGFP-C3-BFGF-transfected bone marrow mesenchymal stem cell transplantation can improve blood glucose levels and stimulate insulin secretion in diabetic rats, which may improve the severity of diabetes mellitus by decreasing the mRNA expression of matrix metalloproteinases.     

同种异体骨髓间充质干细胞移植在心肌梗死后心室重建中的作用

BACKGROUND:Myocardial infarction leads to ischemic changes in the myocardium, triggering the emergence of ventricular remodeling, which is an important cause of death. Myocardial infarction is a common disease in the middle-aged and elderly population, but autologous bone marrow mesenchymal stem cells from these patients exhibit a weak ability of proliferation and differentiation. Therefore, a positive attempt of allogeneic stem cell transplantation is required in order to obtain better therapeutic outcomes. OBJECTIVE:To explore the effect of allogeneic bone marrow mesenchymal stem cells on ventricular remodeling after myocardial infarction.   METHODS:Bone marrow mesenchymal stem cells from 10 neonatal rats and 10 adult rats were isolated, cultured and identified. Another 40 rats were randomly assigned into four groups (n=10/group): model group, neonatal rat cell transplantation group, adult rat cell transplantation group, or sham group. Animal models of myocardial infarction were made in rats in the all groups except for the sham group in which the rats were given sham operation. Rats in the two cell transplantation groups were given the corresponding cell transplantation. Four weeks postoperatively, heart function of rats was detected in each group, and cardiac tissues were taken to detect changes in collagen formation and blood vessel density in the infarct area. RESULTS AND CONCLUSION:Four weeks after surgery, rats in the model group showed significant changes in cardiac function indexes as compared with the other groups (P < 0.05), while compared with the model group, these cardiac function indexes improved in both two cell transplantation groups, but there was no significant difference between the two cell transplantation groups (P > 0.05). Meanwhile, compared with the model group, significantly decreased collagen formation and increased blood vessel density were found in both two cell transplantation groups (P < 0.05). Additionally, the vascular density of the infarct area was highest in the sham group (P < 0.05). Experimental results show that both neonatal and adult rat bone marrow mesenchymal stem cell transplantation can improve cardiac function of rats, reduce the formation of collagen in the infarct area and delay ventricular remodeling after myocardial infarction.     

碱性成纤维细胞生长因子基因修饰骨髓间充质干细胞移植修复急性肾损伤

BACKGROUND:It has been confirmed that basic fibroblast growth factor (bFGF) can promote the growth, proliferation, differentiation and functional expression of most cells derived from neuroderm and mesoderm. OBJECTIVE:To investigate the effect of bFGF-transfected bone marrow mesenchymal stem cell transplantation in rats with acute kidney injury. METHODS:bFGF genes were transfected into bone marrow mesenchymal stem cells via an adenovirus vector, and then expression of bFGF in transfected cells was identified using RT-PCR technology. Rat models of acute kidney injury were prepared by clipping bilateral renal pedicles, and then randomized into three groups (n=20): rats were given injection of bone marrow mesenchymal stem cell suspensions via tail vein as negative transfected group, those given injection of bFGF-transfected bone marrow mesenchymal stem cell suspensions via tail vein as bFGF-transfected group, and the others given injection of DMEM via tail vein as model group. Four weeks later, levels of serum creatinine and urea nitrogen were detected, expressions of connective tissue growth factor and growth factor in renal tissues were detected by Western blot assay, and morphology of renal tissues was observed using hematoxylin-eosin staining. RESULTS AND CONCLUSION:bFGF genes were successfully transfected into bone marrow mesenchymal stem cells. Compared with the model group, the levels of serum creatinine and urea nitrogen were significantly reduced in bFGF-transfected and negative transfected groups, especially in the bFGF-transfected group (P < 0.05), while expressions of connective tissue growth factor and transforming growth factor in renal tissues in bFGF-transfected and negative transfected groups were significantly weakened in these two groups (P < 0.05), but there were no significant differences between the bFGF-transfected group and negative transfected group (P > 0.05). Besides, renal tissues necrosis and inflammatory reactions were mitigated in the negative transfected group; renal tubules with normal outlines and no overt necrotic cells could be found in the bFGF-transfected group. These findings show that bFGF-transfected bone marrow mesenchymal stem cell transplantation plays a better role in acute kidney injury repair in rats.