人骨形态发生蛋白2腺病毒表达载体转染人骨髓基质干细胞和对其增殖及分化的影响

目的：研究人骨形态发生蛋白-2腺病毒表达载体(Ad-BMP-2)转染人骨髓基质干细胞(hBMSC)对其增殖及分化的影响。方法：利用免疫组化、原位杂交染色和蛋白印迹法检测转染后细胞。BMP-2的表达。流式细胞仪和ALP活性测定分析BMP-2基因转染对细胞增殖、分化的影响。结果：转染后，hBMP-2基因在mRNA水平和蛋白水平均有表达。蛋白印迹法检测到培养液中有BMP-2蛋白阳性表达，S期细胞比例和ALP活性明显增高。结论：Ad-BMP-2可高效转染hBMSC，且促进细胞增殖和成骨转化。     

转染人骨形态发生蛋白-2基因的羊骨髓间充质干细胞的异位成骨研究

目的评价腺病毒介导的人骨形态发生蛋白-2(hBMP-2)基因转染羊骨髓间充质干细胞(MSCs)后的成骨活性。方法实验分为3组:(1)hBMP-2转染细胞组,(2)半乳糖苷酶基因(βgal)转染细胞组,(3)未转染细胞组。从羊骨髓中分离培养MSCs,基因转染后利用免疫沉淀和Westernblot方法检测BMP-2的表达,并在体外进行碱性磷酸酶(ALP)和VonKossa染色、ALP定量测定、透射电镜观察。分别将细胞悬液注入裸鼠股后部肌内,分期进行X线和组织学检查。结果Westernblot检测发现只有hBMP-2转染细胞组的MSCs表达并分泌hBMP-2。该组于转染后第12d,ALP活性达高峰,与其它两组比较,差异有显著性意义;于16d后出现钙结节,而其它两组未见。透射电镜观察见hBMP-2转染细胞组的细胞内粗面内质网、线粒体和溶酶体增多。裸鼠肌内注射细胞悬液后3周,hBMP-2转染细胞组即有异位成骨,6周时明显增多,其它两组仅见纤维组织形成或微量成骨。结论hBMP-2基因转染能诱导羊MSCs分化为成骨细胞,并在裸鼠体内诱导成骨。     

人骨形态发生蛋白2腺病毒表达载体转染人骨髓基质干细胞和对其增殖及分化的影响

目的:研究人骨形态发生蛋白-2腺病毒表达载体(Ad-BMP-2)转染人骨髓基质干细胞(hBMSC)对其增殖及分化的影响.方法:利用免疫组化、原位杂交染色和蛋白印迹法检测转染后细胞BMP-2的表达.流式细胞仪和ALP活性测定分析BMP-2基因转染对细胞增殖、分化的影响.结果:转染后,hBMP-2基因在mRNA水平和蛋白水平均有表达.蛋白印迹法检测到培养液中有BMP-2蛋白阳性表达,S期细胞比例和ALP活性明显增高.结论:Ad-BMP-2可高效转染hBMSC,且促进细胞增殖和成骨转化.     

hBMP-2基因转染兔骨髓间充质干细胞的表达及生物学效应的观察

目的:观察人骨形态发生蛋白-2(humanbonemorphogeneticprotein-2,hBMP-2)基因转染兔骨髓间充质干细胞(bonemarrowmesenchymalstemcells,BMSCs)后的表达及表达产物对BMSCs增殖和向成骨细胞分化的影响。方法:利用腺病毒表达载体Adeno-XTM将hBMP-2基因转染兔BMSCs,用免疫组化染色。检测细胞内BMP-2的表达。然后通过MTT法分析其对细胞增殖的影响,并分别通过体外检测Ⅰ型胶原合成和表达情况、碱性磷酸酶染色和钙结节VonKossa染色,观察腺病毒介导hBMP-2基因转染兔BMSCs的成骨分化能力。结果:转基因细胞6周时仍能表达外源性基因。基因表达产物hBMP-2能明显促进BMSCs的增殖以及I型胶原的合成,转染后第14天碱性磷酸酶染色多数细胞为阳性,第21天出现钙结节。结论:hBMP-2基因转染BMSCs后可获得稳定表达,且基因表达产物能促进BMSCs增殖,并诱导其向成骨细胞分化。     

转染人骨形成蛋白-7基因的骨髓基质细胞异位成骨实验研究

目的 观察转染人骨形成蛋白-7（Bone morphogenetic protein-7,BMP-7）基因的骨髓基质细胞（Bone marrow stromal cells,BMSCs）与胶原膜（BME-10X）复合培养后的异位成骨能力。方法将hBMP-7基因转染Beagle犬BMSC,与胶原膜复合培养后,植入裸鼠皮下,8周后取材,HE、Mallory染色及Ⅰ型胶原免疫组化染色,观察其异位成骨能力。结果各组均有不同程度Ⅰ型胶原的表达,转染组和未转染组显著高于单纯膜组,转染组又显著高于未转染组（P〈0．05）。结论转染了hBMP-7基因的BMSCs具有更强的异位成骨能力,有望成为牙周组织工程理想的种子细胞,     

腺病毒骨形态发生蛋白2绿色荧光蛋白基因转染兔骨髓基质干细胞成骨及示踪作用

目的 观察腺病毒介导的人骨形态发生蛋白绿色荧光蛋白基因(Ad-GFP-hBMP-2)转染对骨髓间质干细胞(bMSCs)成骨能力的影响.方法 取日本大耳白兔4只自双侧股骨远端抽取骨髓培养bMSCs.以Ad-GFP-hBMP-2基因(实验组)及Ad-GFP(对照组)基因转染bMSCs后,用ALP检测试剂盒检测两组细胞的ALP活性;原位杂交检测两组细胞I型胶原的表达;Western blot 检测细胞中BMP-2的表达.将转染后24 h的bMSCs接种到裸鼠体内,术后第4、8、12周观察成骨情况.结果 转Ad-GFP-hBMP-2基因组和Ad-GFP组各时间段ALP分泌量差异分别有统计学意义(P<0.01);实验组I型胶原原位杂交实验组为阳性.实验组成骨阳性率为90%,对照组为40%.结论 bMSCs经Ad-GFP-hBMP-2基因转染后能高效表达BMP-2并诱导成骨.腺病毒介导人BMP-2转基因可以提高bMSCs的成骨能力.     

人骨形态发生蛋白2重组腺病毒载体的构建及其生物学活性检测

目的构建人骨形态发生蛋白2(hBMP-2)重组腺病毒载体(Ad-hBMP-2),并检测其转染后的骨髓基质细胞hBMP-2表达以及成骨能力的改变。方法采用Cre-lox重组方法构建含有hBMP-2基因的复制缺陷型重组腺病毒,并利用原位杂交和免疫组化手段观察转染后的骨髓基质细胞hBMP-2mRNA和蛋白表达情况;通过Ⅰ型胶原原位杂交、碱性磷酸酶测定、透射电镜观察以及裸鼠肌袋试验评价Ad-hBMP-2转染对兔骨髓基质细胞成骨能力的影响。结果病毒培养上清液的聚合酶链式反应证实构建的重组腺病毒含有Ad-hBMP-2基因,重组腺病毒滴度达3·8×1010pfu/L;感染增殖率为100的Ad-hBMP-2转染兔骨髓基质细胞24h和48h后即可分别检测到显著的hBMP-2mRNA和蛋白表达,转染效率几乎达100%;Ad-hBMP-2转染可以明显刺激兔骨髓基质细胞Ⅰ型胶原mRNA表达、碱性磷酸酶分泌、细胞内蛋白质合成以及异位骨形成等。结论Ad-hBMP-2具有高效转染能力,并能够诱导骨髓基质细胞向成骨细胞转化,进而促进骨形成。     

Ad-hBMP-2转染体外培养人退变腰椎间盘细胞的研究

[目的]研究人骨形态发牛蛋白-2腺病毒表达载体（Ad—hBMP-2）转染体外培养人退变腰椎问盘细胞，分析其对腰椎间盘细胞影响.[方法]成人退变腰椎间盘细胞体外培养，通过免疫组化和染色体分析鉴定椎间盘细胞。利用免疫荧光和蛋白印迹法检测不同转染剂量对细胞BMP-2表达的影响。[结果]体外培养成人退变腰椎间盘细胞第2代鉴定具有其结构功能。转染后通过免疫荧光和蛋白印迹法可见随转染剂量增加BMP-2表达量逐渐增加。[结论]Ad—hBMP-2可高效转染体外培养人退变椎间盘细胞，同时随转染剂量增加BMP-2表达量逐渐增加。     

基因修饰人BMSCs构建组织工程骨的实验研究

目的探索构建可稳定表达修饰基因人BMP-2(human BMP-2,hBMP-2)的细胞组织工程骨促进骨再生的可行性。方法从成人肌肉组织中以RT-PCR方法克隆hBMP-2基因全长,连接构建真核质粒载体,经脂质体转染人BMSCs(humanBMSCs,hBMSCs)。设定hBMP-2基因转染细胞组、空质粒载体转染细胞组以及同代细胞正常培养组,经G418筛选培养后,分别行细胞ALP比活性测定、细胞hBMP-2免疫组织化学染色、hBMP-2 mRNA表达水平的RT-PCR检测及细胞上清的hBMP-2分泌水平的免疫酶斑点(dot-ELISA)检测。然后将基因转染细胞与羟基磷灰石(hydroxyapatite,HA)材料进行复合培养,观察组织工程骨的构建情况。动物实验分4组,每组3只裸鼠,于裸鼠双侧背脊肌内分别植入hBMP-2基因转染细胞与HA材料复合培养体(A组),空载质粒转染细胞复合HA材料(B组)、单纯基因转染细胞悬液(C组)以及hBMP-2基因质粒加脂质体(D组)作为对照。4组裸鼠均于4周后取材、脱钙、切片,行HE染色及阿尔新蓝染色观察新骨形成情况。结果 hBMP-2基因转染细胞在培养48 h和3周时均可表达分泌外源基因hBMP-2,免疫组织化学染色呈阳性,且成骨分化的ALP比活性明显高于两对照组(P0.05)。转染细胞能良好贴附于HA表面生长。动物实验中,A组3只裸鼠6侧背脊肌内4侧有较多新骨生成;B组3只裸鼠中的1只双侧背脊肌内有新骨生成;C组未发现新骨生成;D组1只裸鼠1侧背脊肌内发现少量成骨。结论 hBMP-2基因转染修饰的h BMSCs与HA复合培养构建的组织工程骨,可瞬时和稳定表达分泌hBMP-2,并能促进裸鼠肌肉组织内异位成骨。     

人骨形成蛋白2腺病毒表达载体转染体外培养兔腰椎间盘细胞的研究

目的 研究人骨形成蛋白2腺病毒表达载体（adenovirus-mediated human bone morphogenetic protein 2 gene，Ad-hBMP-2）转染体外培养兔腰椎间盘细胞，分析其对腰椎间盘细胞的影响。方法 成年健康新西兰大白兔4只，体重4～5kg，取L2、L3到L6、L7节段椎间盘细胞体外培养。利用免疫荧光和蛋白印迹法（Western blot）检测空白对照组（未转染）、Ad-LacZ组[感染复数（multiplicity of infection，MOI）150MOI]和不同剂量Ad-hBMP-2（50、100、150MOI）组转染后细胞hBMP-2的表达水平。采用RT-PCR检测转染后细胞Ⅱ型胶原和aggrecan mRNA表达水平。结果 转染Ad-hBMP-2后通过免疫荧光和蛋白印迹法可见随转染剂量增加hBMP-2表达量逐渐增加，与50MOI组比较100MOI组升高102％，150MOI组升高183％。在转染后第6天RT-PCR结果显示转染组aggrecan和Ⅱ型胶原mRNA的表达高于对照组，并且随转染剂量增高mRNA的表达量均逐渐增加。aggrecan mRNA从50MOI组的61．7％增加到150MOI组的167．3％。Ⅱ型胶原mRNA从50MOI组的77．3％增加到150MOI组的169．0％。结论 Ad-hBMP-2可高效转染体外培养兔腰椎间盘细胞，随转染剂量增加hBMP-2表达量逐渐增加，同时上调aggrecan和Ⅱ型胶原mRNA的表达，并存在剂量依赖关系。     

Bone induction by BMP-2 transduced stem cells derived from human fat.

PURPOSE: We have isolated pluripotent mesenchymal progenitor cells in large numbers from liposuction aspirates (processed lipoaspirate cells or PLAs). This study examines the osteogenic potential of PLAs and bone marrow aspirate cells (BMAs), when exposed to either recombinant human bone morphogenetic protein (BMP)-2 (rh-BMP-2) or adenovirus containing BMP-2 cDNA (Ad-BMP-2). METHODS: Liposuction aspirates underwent proteolytic digestion to obtain PLAs. After exposure to exogenous rh-BMP-2 or Ad-BMP-2 for four or seven days, PLAs and BMAs were assessed by histochemistry, spectrophotometry and RT-PCR. Western blotting and ELISA confirmed BMP gene transduction. Results were compared to osteoblasts and cells in osteogenic media only. PLA-Ad-BMP-2 cells were seeded on matrices and implanted in the hind limbs of SCID mice. RESULTS: Analysis of quantified bone precursor assays including extracellular ALP histomorphometry, intracellular ALP spectrophotometry, and calcified extracellular matrix (von Kossa) histomorphometry revealed that PLAs treated with exogenous rh-BMP-2 or transduced with a BMP-2 containing adenovirus (PLA-Ad-BMP-2) produced more bone precursors than osteoblasts (p=0.001). PLAs treated with exogenous rh-BMP-2 or PLA-Ad-BMP-2 also produced more bone precursors than BMAs (p=0.001), except for day 7 ALP histomorphometry (p=0.343). ELISA confirmed successful BMP-2 production by both progenitor cell groups transduced with Ad-BMP-2. H&E sections from collagen I matrices seeded with PLA-Ad-BMP-2 cells confirmed bone formation at six weeks. CONCLUSIONS: Liposuction aspirates contain PLAs that can be transfected with the BMP-2 gene, with rapid induction into the osteoblast phenotype at a rate comparable to rh-BMP-2 and osteoblast groups. Transduced PLAs produce more bone precursors with faster onset of calcified extracellular matrix than transduced BMAs. PLAs may be an ideal source of mesenchyme-lineage stem cells for gene therapy and tissue engineering.     

BMP2基因修饰犬脂肪源性基质细胞修复自体大段骨缺损

目的 评价BMP2基因修饰的犬脂肪源性基质细胞(ADSCs)与β-磷酸三钙(β-TCP)复合修复自体大段骨缺损的疗效.方法 从比格犬背部脂肪组织中提取基质细胞,转染腺病毒介导的人BMP2基因(Adv-hBMP2),通过ELISA和裸鼠体内异位成骨实验鉴定BMP2的表达及异位成骨活性;取比格犬11只,制作双侧尺骨2.5 cm骨缺损模型,缺损处旷置(4侧)或随机填充:单纯TCP(6侧),AD-SCs+TCP(6侧),Adv-hBMP2-ADSCs+TCP(6侧).所有动物16周后处死.结果 ELISA显示犬ADSCs被腺病毒转染后可高表达具有成骨活性的BMP2;裸鼠体内异位成骨实验证实所分泌的BMP2具有骨诱导活性.骨缺损修复的X线片显示,单纯TCP和ADSCs+TCP组至16周时,骨缺损均未愈合;BMP2基因修饰ADSCs+TCP组6例中2例愈合,4例部分愈合.显微摄片和组织学观察示:单纯TCP和AD-SCs+TCP组仅在骨缺损断端形成编织骨,缺损中央被纤维组织填充,而Adv-hBMP2-ADSCs+TCP组骨.缺损处皮质连续,新生骨组织主要为编织骨,部分改建形成板层骨.组织形态学分析示BMP2基因修饰ADSCs明显促进了新骨形成.结论 BMP2基因修饰ADSCs可以修复犬尺骨大段骨缺损.     

Ectopic bone formation of human bone morphogenetic protein-2 gene transfected goat bone marrow-derived mesenchymal stem cells in nude mice

onemorphogenetic proteins (BMPs)haveapowerfulcapacitytoelicitnewboneformation .ThereareseveraldeliverymethodsofBMPsintreatingbonedefects ,oneofwhichisgenetherapy .Retrovirus,adenovirusandadeno associatedvirushavebeenutilizedtodeliverBMPgene .1,2 Sincethedirectuseofthesevectorshasseveraldisadvantages ,wehavedevelopedexvivo genetherapytechniquewhichinvolvestheisolationandcultivationofautologousbonemarrow derivedmesenchymalstemcells (MSCs) ,transfectionofthecellsinvitroandimplantationofthesec…     

凝胶包埋BMP-2基因及振荡构建工程化骨的生物效应评估

目的 分析构建工程化骨的生物学行为,评估优化构筑工程化骨的方法. 方法 用人骨形态发生蛋白2腺病毒载体(Ad-BMP-2)转染兔脂肪基质细胞,nB-TCP/Cs/PCL支架接种及构建工程化骨,分A组(基因转染加静态培养),B组(凝胶加生长因子加振荡培养)、C组(凝胶加基因转染加振荡培养)和D组(凝胶加生长因子加静态培养);第1、4、8、12、16、20、24、28天,电镜、共聚焦显微镜观察,检测凋亡率、增殖、碱性磷酸酶活性及体内成骨分析.结果 C组细胞生长旺盛,细胞外基质丰富,凋亡率低于其它组(P＜0.05),增殖活力、碱性磷酸酶水平均高于其它组(P＜0.05),工程化骨发育成熟. 结论 凝胶包埋成骨基因与振荡模式为构建工程化骨的理想方法.     

In vivo molecular imaging of adenoviral versus lentiviral gene therapy in two bone formation models.

Regional gene therapy techniques are promising methods to enhance bone formation in large bone defects that would be difficult to treat with allograft or autograft bone stock. In this study, we compared in vivo temporal expression patterns of adenoviral- and lentiviral-mediated gene therapy in two bone formation models. Primary rat bone marrow cells (RBMC) were transduced with lentiviral or adenoviral vectors containing luciferase (Luc) or BMP-2 cDNA, or cotransduced with vectors containing Luc and bone morphogenetic protein 2 (BMP-2). In vitro protein production was determined with luciferase assay or ELISA (for BMP-2 production) weekly for 12 weeks. Two bone formation models were used -- a hind limb muscle pouch or radial defect -- in SCID mice. A cooled charged-coupled device (CCD) camera was used to image in vivo luciferase expression weekly for 12 weeks. In vitro, adenoviral expression of BMP-2 and luciferase was detected by ELISA or luciferase assay, respectively, for 4 weeks. Lentiviral expression of BMP-2 and luciferase was sustained in culture for 3 months. Using the CCD camera, we found that adenoviral vectors expressed luciferase expression for up to 21 days, but lentiviral vectors expressed target gene expression for 3 months in vivo in both bone formation models. There was no detectable difference in the amount of bone formed between the adenoviral and lentiviral groups. Lentiviral-mediated delivery of BMP-2 can induce long term in vitro and in vivo gene expression, which may be beneficial when developing tissue engineering strategies to heal large bone defects or defects with a compromised biologic environment.     

脂肪间充质干细胞的成骨诱导分化

目的　研究脂肪间充质干细胞 (MSCs)在特定培养条件下向成骨细胞分化 ,探讨其作为骨组织工程的种子细胞的可行性。方法　取 3周龄Lewis大鼠的腹股沟脂肪垫 ,消化法获得脂肪MSCs,用成骨诱导培养基诱导其向成骨细胞分化 ,组织化学染色、免疫细胞化学染色和Westernblotting检测细胞分化的情况。结果　从成体大鼠脂肪组织中培养出脂肪MSCs,能大量稳定增殖传代。在地塞米松、抗坏血酸、β-甘油磷酸钠的诱导下 ,脂肪MSCs的ALP活性增高 ,VonKossa染色出现钙结节 ,OPN、BMP - 2免疫细胞化学染色阳性 ,Westernblotting检测到诱导后细胞OPN、BMP - 2的表达 ,且随诱导时间延长表达增强。结论　从脂肪组织中可获得具有多分化潜能的MSCs,并能在体外稳定增殖传代 ,经诱导后可分化为脂肪细胞和成骨细胞 ,有可能成为骨组织工程较理想的种子细胞之一     

Protective effects of adipose-derived stem cells with phosphodiesterase 5 inhibition by lentivirus-mediated stable gene silencing on ischemia-reperfusion injury of renal tubular epithelial cells

Objective To explore the protective effects of adipose-derived stem cells (ADSCs) with phosphodiesterase 5 inhibition by lentivirus-mediated stable gene silencing on the proliferation and apoptosis of renal tubular epithelial cells induced by ischemia-reperfusion injury in vitro. Methods To isolate cultivate and indentify ADSCs from rats. Lentiviral expression vector of carrying PDE5 shRNA gene was transfected into ADSCs, and a negative control group was set up．Western blotting was used to detect PDE5 protein expression levels. ADSCs were co-cultured with NRK-52E in a transwell system, and NRK-52E cells were treated with ischemia/reoxygenation protocol. Edu assay was performed to evaluate the proliferation of NRK cells, flow cytometry to detect the apoptosis of NRK cells, and ELISA to quantify the protein expressions of fibroblast growth factor (FGF) and hepatocyte growth factor (HGF). The expression of E-cadherin and cytokeratin 18 (CK18) was quantified by real time PCR and flow cytometry. Results Western blotting for PDE5 protein indicated a significant reduction of PDE5 protein levels in PDE5 shRNA transduced population. After the treatment of ischemia/reoxygenation in vitro, the proliferative viability and apoptosis of NRK-52E cells co-cultured with ADSCs induced by PDE5 gene inhibition were significantly improved, compared to the normal group (all P＜0.05). And the release of HGF, FGF were markedly enhanced (all P＜0.05). Moreover, the NRK-52E cells survival, the expression of E-cadherin and CK18 on PDE5 inhibited ADSCs co-cultured with I/R injured NRK cells was significantly increased compared to that in the negative control group (all P＜0.05). Conclusion ADSCs preconditioned by inhibition of PDE5 can be a powerful novel approach to improve the survival of renal tubular cells following ischemia-reperfusion injury, and have an obvious tendency to transform epithelial cells.     

负载碱性成纤维细胞生长因子、骨形态发生蛋白-12基因的兔脂肪干细胞向成纤维细胞分化的实验研究

目的:探讨碱性成纤维细胞生长因子(bFGF)、骨形态发生蛋白(BMP)-12基因序贯转染兔脂肪干细胞向成纤维细胞分化的可能性。方法:2017年1月至2018年12月,原代培养兔脂肪干细胞(取自新西兰大耳兔颈背部皮下脂肪),细胞表面抗原CD44、CD49d、CD106检测结合成骨细胞诱导分化对培养的细胞进行鉴定,脂质体介...     

Immune response and effect of adenovirus-mediated human BMP-2 gene transfer on the repair of segmental tibial bone defects in goats

BACKGROUND: Tissue-engineered bone may be used for filling bone defects. There are, however, no reports on this technique used in large animals. METHODS: We evaluated the effectiveness of, and immune response in repairing diaphyseal bone defects by gene transfer using bone morphogenetic proteins (BMPs). We used adenovirus-mediated human BMP-2 (Adv-hBMP-2) gene-transduced bone marrow stromal cells (BMSCs) to repair 2.1-cm segmental tibial bone defects in goats (group I, n = 7). An Adv-ssgal-transduced BMSC group (group II, n = 5), a non-transduced BMSC group (group III, n = 5), and an untreated group (group IV, n = 2) were used as controls. Self-secreted extracellular matrix was used as cellular carrier. RESULTS: Radiographic and histomorphometric examination demonstrated more callus in the bone defects of group I compared to other groups.Week 24 after implantation, the defect healing rates of groups I, II, III, and IV were 6/7, 1/5, 2/5, and 0/2, respectively. The maximum compressive strength of new tissue in the bone defects of group I was higher than those of groups II and III. Temporary cellular and persistent humoral immune responses against adenovirus were detected after hBMP-2 gene transfer. INTERPRETATION: We found that Adv-hBMP-2 genetransduced BMSCs had superior osteoinductivity in the repair of tibial bone defects in goats, but it could cause temporary cellular and persistent humoral immune responses against adenovirus.