rhBMP-2及rhbFGF对兔骨髓间充质干细胞碱性磷酸酶表达的影响

目的:检测rhBMP-2和rhbFGF单独、联合及序贯作用对兔骨髓间充质干细胞碱性磷酸酶作用的长期效应。方法:在细胞培养技术下,采用碱性磷酸酶检测试剂盒检测单独、联合及序贯施加rhBMP-2和rhbFGF后,兔骨髓间充质干细胞在第2、5、7及10天时碱性磷酸酶的活性水平,以反映对细胞分化作用的影响,并进行统计学分析。结果:rhBMP-2能长期显著地促进细胞的碱性磷酸酶活性,而rhbFGF则起到抑制作用,且均呈剂量依赖性。rhBMP-2单独作用与2种生长因子联合作用的效应相近,且均高于rhbFGF单独作用或2种因子序贯作用的效应。结论:不同生长因子的不同应用方式.对骨髓间充质干细胞分化作用的长期效应不同。     

rhBMP-2和IGF-I联合作用对兔成骨样细胞增殖的影响

目的研究人重组骨形成蛋白(recombinant human bone morphogenetic protein,rhBMP),胰岛素样生长因子-1(insulin-like growth factor-1,IGF-I)单独及联合应用对兔成骨细胞增殖的影响.方法采用细胞培养技术及噻唑蓝比色法,对2种生长因子对兔成骨样细胞增殖的调节作用进行观察.结果在培养基中含1%胎牛血清(FBS)条件下,100ng/ml rhBMP-2对兔成骨样细胞增殖作用不显著.IGF-I(5,25,50ng/ml)有一定促增殖作用.两者联合应用各浓度组对细胞增殖有促进作用(P＜0.05).结论rhBMP-2和IGF-I联合应用对兔成骨样细胞增殖有协同效应.     

骨形成蛋白-2和碱性成纤维细胞生长因子对人骨髓基质细胞的生物学作用

目的：探讨重组人骨形成蛋白-2(rhBMP-2)和碱性成纤维细胞生长因子(b—FGF)单独或联合作用对人骨髓基质细胞(HBMSC)增殖和分化的影响。方法：利用四唑盐比色法(MTT)、碱性磷酸酶(ALP)测定法观察不同浓度的rhBMP-2和b—FGF单独或联合作用时HBMSC的增殖和分化情况。结果：rhBMP-2对HBMSC的增殖和ALP表达均有促进作用；b—FGF促进HBMSC增殖，但抑制ALP表达；rhBMP-2和b—FGF联合作用时HBMSC的增殖和ALP活性较单独作用有显著提高。结论：rhBMP-2和b—FGF联合应用时对HBMSC的增殖和向成骨细胞分化具有协同作用。     

rhBMP—2和rhTGF—β1联合应用对人牙髓细胞增殖的影响

目的：观察不同浓度的rhBMP-2和rhTGF-β1单独或联合应用对体外培养人牙髓细胞增殖的影响。方法：MTT法。结果：rhBMP-2对人牙髓细胞无增殖作用,rhTGF-β1在浓度为1.0μg/L时对人牙髓细胞有增殖效应。两者联合应用各浓度组对人牙髓细胞增殖无交效应（P＞0.05)。结论：rhBMP-2和rhTGF-β1联合应用对人牙髓细胞增殖无叠加或抵消作用。     

不同CpG ODN对大鼠骨髓间充质干细胞增殖作用的研究

目的：筛选对大鼠骨髓间充质干细胞增殖具有影响作用的CpG ODN。方法：体外全骨髓贴壁法提取并纯化大鼠骨髓间充质干细胞,传至第3代孵育12 h至完全贴壁,双盲法加入不同CpG ODN共孵育48 h,MTT比色法检测,不同大鼠重复实验3次,筛选促进大鼠骨髓间充质干细胞增殖的CpG ODN。结果：与PBS溶媒对照组相比,有4条CpG ODN对不同大鼠BMSCs均具有显著促增殖作用,MTT结果具有统计学意义（P〈0.05）。结论：4条CpG ODN具有显著促进大鼠BMSCs增殖的作用,将在下一步的实验中探讨它们对BMSCs分化功能的作用。     

rhBMP-2/rhTGF-β1联合应用对兔成骨样细胞增殖及分化的影响

目的：探讨转化生长因子β(trabsfirnubg griwtg factirs beta,TGF—β)、与骨形成蛋白(bone morphogenetic proteins,BMP)联合应用对兔成骨样细胞增殖及分化的影响。方法：体外培养兔成骨样细胞,采用四唑盐比色法和碱性磷酸酶试剂盒检测两种生长因子对兔成骨样细胞增殖及分化的影响。结果：100ng／ml rhBMP-2促进兔成骨样细胞的分化,对增殖无明显作用。不同浓度的rhTGF-β1均可促进成骨样细胞的增殖,对分化无明显作用。二在同时应用时,其作用部分或完全抵消。结论：在本实验条件下,rhBMP-2、rhTGF-β1联合应用时无协同效应。     

rhBMP-2/rhTGF-β_1联合应用对兔成骨样细胞增殖及分化的影响

目的: 探讨转化生长因子β(transforming growth factors beta,TGF-β)、与骨形成蛋白(bone morphogenetic proteins,BMP)联合应用对兔成骨样细胞增殖及分化的影响。方法: 体外培养兔成骨样细胞,采用四唑盐比色法和碱性磷酸酶试剂盒检测两种生长因子对兔成骨样细胞增殖及分化的影响。结果: 100ng/ml rhBMP-2促进兔成骨样细胞的分化,对增殖无明显作用。不同浓度的rhTGF-β1均可促进成骨样细胞的增殖,对分化无明显作用。二者在同时应用时,其作用部分或完全抵消。结论:在本实验条件下,rhBMP-2、rhTGF-β1联合应用时无协同效应。     

骨形成蛋白—2和成纤维细胞生长因子对人牙周膜细胞增殖的联合效应

目的：探讨重组人骨形成蛋白－2（rhBMP-2)和碱性成纤维细胞生长因子(bFGF) 单独或联合作用对人牙周膜细胞（PDLCs)增殖的影响。方法：体外培养人PDLCs,分别用不同浓度的rhBMP-2和bFGF单独或联合作用,用四唑盐比色法（MTT法）进行观察。结果：rhBMP-2和bFGF单独作用后PDLCs的增殖较对照组有明显的升高;而rhBMP-2与bFGF联合作用后PDLCs的增殖较各自单独作用有更明显的升高（P＜0．05）。结论：rhBMP-2与bFGF联合应用对于促进人PDLCs的增殖具有协同作用。     

SHH和bFGF体外诱导人牙髓干细胞向神经细胞分化的研究

目的：研究体外使用音猬因子（SHH）、碱性成纤维生长因子（bFGF）体外诱导人牙髓干细胞（DPSCs）分化为神经细胞的可行性,以优化人牙髓干细胞向神经细胞分化的诱导条件。方法：从因正畸或阻生拔除的第一前磨牙或第三磨牙中提取牙髓,采用酶消化及过滤法得到单细胞悬液,有限稀释法培养分离的原代人牙髓干细胞,并进行克隆化培养,检测间充质干细胞特异性标志物STRO-1的表达。将人牙髓干细胞分别接种于含有不同浓度诱导液,MTT法检测不同时间、两种因子单独或联合对细胞增殖能力的影;免疫荧光法检测抗微管相关蛋白（MAP-2）、神经元烯醇化酶（NSE）、胶质原纤维酸性蛋白（GFAP）的表达。透射电镜观察诱导前后细胞超微结构。结果：克隆来源细胞的间充质干细胞特异性标志物STRO-1表达阳性。100μg/L音猬因子SHH与20μg/L碱性成纤维生长因子bFGF单独作用促增殖作用最强（P〈0.05）,碱性成纤维生长因子bFGF单独作用各组及对照组均未检测出神经元样细胞。音猬因子SHH作用各组检测到阳性细胞。而100μg/L音猬因子SHH与20μg/L碱性成纤维生长因子bFGF联合增殖和分化作用均优于其它组。透射电镜观察到神经元样细胞表现。结论：100μg/L音猬因子和20μg/L碱性成纤维生长因子联合可以在体外有效诱导人牙髓干细胞分化为神经细胞。     

rhBMP-2聚氰基丙烯酸正丁酯纳米微球缓释系统对骨髓间充质干细胞的生物学效应

目的 制备rhBMP—2聚氰基丙烯酸正丁酯纳米微球缓释系统，检测其对兔骨髓间充质干细胞(BMSCs)的生物学效应。方法 采用改良的乳化溶液聚合法制备rhBMP—2纳米微球；采用MTT法检测微球对BMSCs的增殖状况的影响；碱性磷酸酶(ALP)检测试剂盒检测细胞ALP活性以反映微球对其分化状况的影响，并与单纯rhBMP—2的作用进行比较。结果 该微球缓释系统有生物活性，能显著促进BMSCs的增殖及分化，并呈剂量依赖性。其效应高于单纯施加rhBMP—2的效应。结论 在组织工程技术中应用生长因子缓释系统的作用明显优于单纯生长因子的作用。     

兔骨髓间充质干细胞的体外分离培养、低温冻存及复苏研究

目的寻求体外培养、冻存、复苏兔骨髓间充质十细胞（bone marrow mesenehymal stein cell,BMMSC）的方法,观察体外培养BMMSC的形态及生长特性,研究低温冻存对兔BMMSC生长的影响,为兔BMMSC进一步的实验研究打下基础。方法取新西兰白兔胫骨穿刺获取骨髓液,密度梯度离心法联合贴壁培养法体外纯化扩增,并行液氮冻存3个月。通过倒置显微镜观察其生物学表现,并进行细胞增殖活性分析．绘制生长曲线。结果兔BMMSC为贴壁生长,形态为均匀成纤维细胞样,增殖能力强,传代及冻存后细胞仍然保持其生物学特性。结论兔BMMSC可采取密度梯度离心法联合贴壁培养法进行较好地纯化和扩增,并町长期保存于液氮中,在一定的条件下可复苏存活,冻存不影响细胞的增殖能力。     

The effect of combination of recombinant human bone morphogenetic protein-2 and basic fibroblast growth factor or insulin-like growth factor-I on dental implant osseointegration by confocal laser scanning microscopy

BACKGROUND: The healing period of bone-implant osseointegration usually varies from 3 to 6 months or even longer. Failure may occur during this time. This study aimed to investigate whether osseointegration of dental implants can be enhanced by the combination of growth factors. METHODS: Sixty-four implants were coated with polylactic acid and divided into four groups. Group I was applied with 1.0 mg recombinant human bone morphogenetic protein-2 (rhBMP-2) and 200 microg recombinant human basic fibroblast growth factor (rhbFGF), group II with 1.0 mg rhBMP-2 and 250 mug recombinant human insulin-like growth factor-I (rhIGF-I), group III with 1.0 mg rhBMP-2, and group IV without growth factors as control. In total, 16 rabbits were used, and two osteotomies were drilled on each side of the femur, in which four different groups were randomly placed. Four weeks after implanting, 20 mg calcein green/kg body weight was administered intravenously, and 8 weeks after implanting, 20 mg alizarin/kg body weight was administered intravenously. Twelve weeks after implanting, the animals were sacrificed. The block of bone with implants was embedded in methylmethacrylate and sectioned, and the percentage of new bone surrounding the implant was analyzed by confocal laser scanning microscopy. RESULTS: There was a statistical difference in bone formation between rhBMP-2-applied groups and the non-applied group at 4 or 8 weeks, and no significant difference between groups I and II (although bone formation in group II was greater than that in group I at 4 weeks). The bone formation in group II was greater than that in group III at 4 or 8 weeks. The formed bone in group I was also greater than the one in group III at 8 weeks, but there was no difference at 4 weeks. CONCLUSIONS: rhBMP-2 could increase new bone formation, and it acted synergistically with rhbFGF and rhIGF-I to improve bone-implant osseointegration. The combination of rhBMP-2 and rhbFGF (group 1) showed faster growth of new bone than other groups at 8 months.     

Human periodontal ligament cell responses to recombinant human bone morphogenetic protein-2 with and without bone allografts

BACKGROUND: Recombinant human bone morphogenetic protein-2 (rhBMP-2) has been found to promote the osteoblastic differentiation of human periodontal ligament cells. Its effect depends on the delivery system used. In this study we examined the effect of rhBMP-2 on the proliferation and osteoblastic differentiation of human periodontal ligament cells cultured alone or with 3 different bone allografts. METHODS: The rhBMP-2 effect on cell proliferation and osteoblastic differentiation was examined by measuring [3H] thymidine incorporation and ALPase activity, respectively, on human periodontal ligament (hPDL) cells. Two human demineralized freeze-dried allografts of cortical (DFDBAco) and cancellous (DFBDAca) bone origin and 1 non-demineralized freeze-dried allograft (FDBA) of cancellous bone origin, derived from different tissue banks, were used to evaluate the rhBMP-2 effect on cell osteoblastic differentiation. The measurements were taken on various days. RESULTS: rhBMP-2 decreased hPDL cell proliferation. rhBMP-2 acted on the third day of the process of cell differentiation, had a specific time of action, achieved its peak effect on the fourth and fifth days, and then did not provoke any further effects. The 3 bone allografts were efficiently combined with rhBMP-2. The combination of rhBMP-2 and DFDBAco showed the effect with the longest duration. rhBMP-2, on day 4, made the inactive bone allograft more active while, on the other days, its effect was dependent on the allograft alone. CONCLUSIONS: rhBMP-2 promotes the osteoblastic differentiation of human periodontal ligament cells and decreases cell proliferation. In this study rhBMP-2 in the presence of the bone allografts tested resulted in hPDL cell differentiation.     

rhBMP-2-PLA纳米微球的制备及生物学效应观察

目的:制备rhBMP-2-PLA纳米微球缓释系统,观察其对兔成骨细胞的生物学效应。方法:采用复乳-干燥法制备rhBMP-2纳米微球,观察其一般特性,并模拟体内条件研究BMP-PLA纳米微球的体外缓释特性。采用MTT法检测微球对成骨细胞增殖状况的影响,并与单纯rhBMP-2的作用进行比较。结果:纳米微球表面光滑圆整,球体大小均匀,平均粒径为45 nm,rhBMP-2-PLA纳米微球的包封率和载药量分别为(90.67±1.23)%和[(134.65±0.44)×10-3]%,微球体外释药符合Higuichi方程。该微球缓释系统有生物活性,能显著促进兔成骨细胞的增殖,其效应高于单纯施加rhBMP-2的效应。结论:rhBMP-2-PLA纳米微球缓释系统的作用明显优于单纯rhBMP-2,在骨创伤的治疗中有良好的前景。     

Bony engineering using time-release porous scaffolds to provide sustained growth factor delivery

Microporous scaffolds designed to improve bony repair have had limited success; therefore, we sought to evaluate whether time-released porous scaffolds with or without recombinant bone morphogenetic protein 2 (rhBMP-2) could enhance stem cell osteoinduction. Custom-made 15/85 hydroxyapatite/β-tricalcium phosphate scaffolds were left empty (E) or filled with rhBMP-2 (E+), calcium sulfate (CS), or CS and rhBMP-2 (CS+). All scaffolds were placed in media and weighed daily. Conditioned supernatant was analyzed for rhBMP-2 and then used to feed human adipose-derived mesenchymal stem cells (ASCs). Adipose-derived mesenchymal stem cell ALP activity, OSTERIX expression, and bone nodule formation were determined. E scaffolds retained 97% (SD, 2%) of the initial weight, whereas CS scaffolds had a near-linear 30% (SD, 3%) decrease over 60 days. E+ scaffolds released 155 (SD, 5) ng of rhBMP-2 (77%) by day 2. In contrast, CS+ scaffolds released only 30 (SD, 2) ng (10%) by day 2, and the remaining rhBMP-2 was released over 20 days. Conditioned media from E+ scaffolds stimulated the highest ALP activity and OSTERIX expression in ACSs on day 2. However, after day 6, media from CS+ scaffolds stimulated the highest ALP activity and OSTERIX expression in ASCs. Adipose-derived mesenchymal stem cells exposed to day 8 CS+-conditioned media produced significantly more bone nodules (10.1 [SD, 1.7] nodules per high-power field) than all other scaffolds. Interestingly, day 8 conditioned media from CS scaffolds simulated significantly more bone nodules than either E or E+ scaffold (P < 0.05 for both). Time-released hydroxyapatite/β-tricalcium phosphate porosity provides sustained growth factor release, enhances ASC osteoinduction, and may result in better in vivo bone formation.     

胰岛素样生长因子-Ⅰ和骨形态发生蛋白-2对人牙周膜细胞增殖的作用

目的：重组人胰岛素样生长因子－Ｉ（ｒｈＩＧＦ－Ｉ）、重组人骨形态发生蛋白－２（ｒｈＢＭＰ－２）分别或联合应用对人牙周膜（ＰＤＬ）细胞增殖的影响。方法：采用组织块法体外培养人ＰＤＬ细胞,ＭＴＴ法测定ＰＤＬ细胞在不同生长因子刺激下的增殖情况。结果：ｒｈＩＧＦ－Ｉ、ｒｈＢＭＰ－２都可促进人ＰＤＬ细胞的增殖,这种促增殖作用呈一定的浓度依赖性,ｒｈＩＧＦ－Ｉ与ｒｈＢＭＰ－２联合应用对人ＰＤＬ细胞的增殖有协同作用,且与单独应用相比相差显著。结论：ｒｈＩＧＦ－Ｉ、ｒｈＢＭＰ－２可望作为牙周再生的生物活性介质,ｒｈＩＧＦ－Ｉ与ｒｈＢＭＰ－２联合应用对ＰＤＬ细胞的促增殖作用更强。