bFGF和TGF-β1对原代培养的前列腺间质细胞的作用

目的:探讨碱性成纤维细胞生长因子(bFGF)和转化生长因子β1(TGF-β1)在良性前列腺增生(BPH)中的作用。方法:培养了人BPH间质细胞,采用MTT法检测无血清培养的间质细胞的增殖,用免疫组化方法检测平滑肌细胞表型变化,观察不同浓度bFGF和TGF-β1对培养的人BPH间质细胞的影响。结果:bFGF促进间质细胞增殖(P<0.05、P<0.01),较高浓度时(10μg/L)降低平滑肌细胞表型表达;TGF-β1(>0.1μg/L)抑制间质细胞增殖并增加平滑肌细胞表型表达(P<0.05、P<0.01);5μg/L的bFGF与0.001μg/L和0.01μg/L TGF-β1作用间质细胞,促进细胞增殖(P<0.01),与0.1μg/L,1μg/L及10μg/L TGF-β1作用间质细胞,抑制细胞增殖,0.1μg/L时对细胞的抑制作用轻微(P>0.05),1μg/L及10μg/L时出现明显的抑制(P<0.01),同时TGF-β1在较高浓度时(>1μg/L),平滑肌细胞表型表达明显增加(P<0.01)。结论:bFGF以时间和浓度依赖的方式促进培养的增生前列腺间质细胞的增殖,并减少平滑肌细胞表型表达;TGF-β1抑制间质细胞的生长并诱导间质细胞向平滑肌细胞分化,两者共同在BPH的形成机制中发挥着重要作用。     

转移生长因子-β、碱性成纤维细胞生长因子诱导人成骨细胞表达血小板衍生生长因子BmRNA的研究

目的　探讨转移生长因子（TGF）-β、碱性成纤维细胞生长因子（bFGF）对人成骨细胞血小板衍生生长因子（PDGF）-B mRNA表达的影响及其意义。方法　体外分离培养人成骨细胞。在体外培养的成骨细胞中分别加入10、20、40、80、160 μg/L梯度浓度的PDGF-BB培养细胞24 h,以摄取3H-TdR为细胞增殖指标检测细胞增殖状况。以4 μg /L的TGF-β和10 μg/L的bFGF培养细胞24 h,寡核苷酸探针检测细胞PDGF-B mRNA的表达。 结果　10～160 μg/L的PDGF-BB可促进成骨细胞增殖（P＜0.05）。在普通培养条件下,细胞不表达PDGF-B mRNA;当培养体系中加入TGF-β和bFGF,可见PDGF-B mRNA的表达。 结论　PDGF-B基因的表达可能是骨组织生长的储备因素,TGF-β和bFGF可诱导成骨细胞表达PDGF-BB。     

转化生长因子—β1对前列腺基质细胞基因表达的调节作用

目的探讨转化生长因子-β1(TGF-β1)对前列腺基质细胞基因表达的调节作用.方法原代培养人前列腺基质细胞,并传代至4～6代.分别将浓度为0.01、0.10、1.00、10.00μg/L的TGF-β1加入细胞培养液中.孵育48h后收集细胞.用内参照半定量RT-PCR方法检测前列腺基质细胞雄激素受体(AR)、TGF-β1、bFGF和平滑肌特异性标记蛋白smoothelin基因的转录水平.结果与对照组相比,低浓度(0.01μg/L)的TGF-β1可增强体外培养的前列腺基质细胞内AR表达(P<0.01),差别有显著性意义.随TGF-β1浓度增加,促AR表达作用减弱.随TGF-β1浓度增加基质细胞TGF-β1、bFGF和smoothelin基因的转录增加(P<0.01),并且随着应用浓度增加促各基因转录的作用增强.结论TGF-β1对前列腺基质细胞基因表达具有广泛的调节作用,在前列腺增生发病中具有重要作用.     

热休克蛋白47在转化生长因子β1诱导肾小管间质纤维化中的作用

目的 探讨热休克蛋白47（HSP47）在肾小管间质纤维化中的作用及其可能机制。 方法 常规培养人肾小管上皮细胞（HK-2）,分为对照组、转化生长因子β1（TGF-β1）组、HSP47-siRNA组。RT-PCR检测HSP47、胶原Ⅳ、纤连蛋白（FN）、组织型纤溶酶原激活物抑制剂1（PAI-1）的mRNA表达。Western印迹检测HSP47、胶原Ⅳ、FN蛋白表达。ELISA检测PAI-1的蛋白量。 结果 HK-2细胞有HSP47表达。不同浓度TGF-β1（0、2.5、5、10 μg/L）干预不同时间（12、24、48 h）时,HSP47基因和蛋白表达呈浓度和时间依赖性增高,10 μg/L TGF-β1干预HK-2细胞48 h时,HSP47 mRNA和蛋白表达最强。不同浓度 TGF-β1（0、5、10 μg/L）干预HK-2不同时间（12、24、48 h）时,胶原Ⅳ、FN 、PAI-1 mRNA和蛋白表达亦呈浓度和时间依赖性增高,10 μg/L TGF-β1作用48 h时,3者mRNA和蛋白表达最强。与TGF-β1组比较,HSP47-siRNA组的HSP47、胶原Ⅳ、FN、PAI-1 mRNA和蛋白表达都明显下调。 结论 HSP47可促进肾小管间质纤维化,其机制可能与上调胶原Ⅳ、FN、PAI-1表达有关。     

不同浓度碱性成纤维细胞生长因子对体外培养兔肌腱细胞增殖的影响

目的探讨不同浓度的碱性成纤维细胞生长因子(bFGF)对体外培养兔肌腱细胞增殖的影响,并确定促进肌腱细胞增殖的最佳浓度。方法在体外培养第2代兔肌腱细胞的培养液中分别加入不同浓度(0.5、1、2、5、10、20、30、40、50μg/L)的bFGF,继续培养48 h,噻唑蓝(MTT)法染色,在酶联免疫检测仪上测出不同浓度bFGF组光密度(OD)值。结果与对照组OD均值相比:5、10、20、30、40、50μg/L bFGF组差异均有统计学意义(P<0.05);各组OD均值随bFGF浓度的增加,先逐渐增大(5～20μg/L),达到峰值后又逐渐降低(20～50μg/L)。结论 bFGF有明显促肌腱细胞增殖的作用,且与浓度有一定相关性,即促肌腱细胞增殖的起始bFGF浓度为5μg/L,而20μg/L时可达到促肌腱细胞增殖的最佳浓度。     

血管内皮生长因子抑制肾小管上皮间充质转化及其与结缔组织生长因子和PI3K-Akt信号通路的关系

目的　探讨血管内皮生长因子（VEGF）对转化生长因子β1（TGF-β1）诱导的肾小管上皮间充质转化（EMT）的作用,及其与结缔组织生长因子（CTGF）、PI3K-Akt信号通路的关系。 方法 （1）将体外培养的HK2细胞分为正常对照组、TGF-β1（5 μg/L,下同）组、VEGF组（100 μg/L,下同）、TGF-β1＋VEGF组。HK2细胞体外培养48 h,用免疫组化双染方法检测肾小管上皮细胞α平滑肌肌动蛋白（α-SMA）和E钙黏蛋白的表达。（2）将体外培养的HK2细胞分为正常对照组、TGF-β1组、VEGF组、TGF-β1＋VEGF组、PI3K-Akt信号通路阻断剂LY294002组（25 μmol/L,下同）、TGF-β1＋LY294002组、VEGF＋LY294002组、TGF-β1＋VEGF＋LY294002组。HK2细胞体外培养48 h,用Western印迹和RT-PCR方法检测α-SMA和CTGF的表达;用ELISA方法检测培养上清中纤连蛋白（FN）和I型胶原（ColⅠ）的表达。 结果 免疫组化结果显示,TGF-β1组α-SMA表达比正常对照组增强,而E钙黏蛋白表达减弱; TGF-β1＋VEGF组α-SMA表达比TGF-β1组显著减弱,而E钙黏蛋白表达增强。 TGF-β1组α-SMA、CTGF蛋白和 mRNA及FN、ColⅠ表达比正常对照组显著增强（均P < 0.05）;TGF-β1＋VEGF组α-SMA、CTGF蛋白和mRNA及FN、ColⅠ表达比TGF-β1组显著减弱（均P < 0.05）;TGF-β1＋VEGF＋LY294002组α-SMA、CTGF蛋白和 mRNA及FN、ColⅠ表达比TGF-β1＋VEGF组显著增强（均P < 0.05）。 结论　VEGF能抑制TGF-β1诱导的体外培养的HK2细胞发生EMT,其机制可能与VEGF下调HK2细胞CTGF表达及减少细胞外FN、ColⅠ合成有关。VEGF的这种作用可能部分通过PI3K-Akt信号转导通路实现,其确切机制有待进一步研究。     

转化生长因子-β1基因转染骨髓基质细胞的瞬时表达与稳定表达

目的 探讨转化生长因子-β1（TGF-β1）基因转染骨髓基质细胞（BMSCs）的表达能力。方法 取6周龄新西兰白兔BMSCs,传代培养后以3μl阳离子脂质体（Lipofectamine):1μg pcD-NA3J-TGF-β1的比例转染,通过免疫组织化学染色及图像分析对3组15份样本检测TGF-β1表达水平;利用水貂肺上皮细胞生长抑制法检测TGF-β1生物活性,分析转染的量效关系和时效关系。结果 瞬时表达组转染后48h免疫组织化学染色部分细胞呈强阳性,稳定表达组全部细胞呈强阳性表达持续4周以上。图像分析显示转染细胞TGF-β1表达显著增强,与对照组比较差异有非常显著性（P＜0．01）。量效关系显示,在转染体系中pcDNA3-TGF--β1(μg）：阳离子脂质体（μl）为1：3时,TGF-β1表达效率最高;时效关系显示,稳定表达组TGF-β1表达活性较瞬时表达组更强。结论 TGF-β1基因转染可使BMSCs有效地表达活性TGF-β1而产生生物效应。     

肿瘤坏死因子-α对肝星状细胞形态及表达结缔组织生长因子的影响

目的 通过观察肿瘤坏死因子（TNF）-α对肝星状细胞（HSC）形态和结缔组织生长因子（CTGF）表达的影响，探讨TNF—α在肝纤维化中的作用机制。方法 采用体外培养大鼠肝星状细胞，加入TNF-α和TGF-β1，透射电镜观察肝星状细胞的形态学改变并应用逆转录聚合酶链反应（RT-PCR）技术检测不同处理组HSC中CTGF的表达。结果 TNF-α、TGF—β1均诱导HSC中CT-GF表达；10μg／L浓度的TNF-α作用6、24和48h后，检测到CTGFmRNA表达，而TGF-β1在1μg/L浓度作用4h后，即可诱导HSC中CTGFmRNA表达。结论 TNF-α诱导HSC中CTGF的表达可能参与早期肝纤维化的形成。     

Genistein对增生性瘢痕成纤维细胞TGF-β1表达及细胞内游离钙的影响

目的 观察5,7,4'-三羟基异黄酮(Genistein)对增生性瘢痕成纤维细胞TCF-β1的表达及细胞内钙离子浓度的影响,探讨Genistein抗纤维化作用的机制.方法 体外培养人增生性瘢痕成纤维细胞,以不同浓度Genistein(25、50、100μmol/L)处理,RT-PCR法检测药物作用48h后细胞TGF-β1mRNA的表达,Western Blot法检测细胞TGF-β1蛋白表达量的变化;激光共聚焦显微镜动态观测Genistein处理后成纤维细胞内Ca2+浓度以及Genistein预处理后再加bFGF刺激的细胞Ca2+浓度的动态变化.结果 Genistein作用后增生性瘢痕成纤维细胞表达TGF-β1的mRNA与蛋白量均显著下调,并具有剂量依赖性;bFGF可使培养的成纤维细胞内游离Ca2+浓度升高,经Genistein预处理的细胞内Ca2+的浓度明显下降.结论 Genistein能抑制增生性瘢痕成纤维细胞TGF-β1,的表达,拮抗生长因子促细胞内游离Ca2+浓度增加的效应,可能是其抗纤维化作用的机制之一.     

转化生长因子-β1对乳腺癌细胞株增殖和T淋巴细胞免疫的影响

目的检测转化生长因子(TGF)-β1对乳腺癌细胞株增殖能力和T淋巴细胞免疫的影响,探讨TGF-β1在乳腺癌演进过程中的作用。方法噻唑蓝(MTT)比色法检测TGFβ1对乳腺癌细胞株MCF7、MDAMB157、SKBR3和MDAMB453增殖的影响,探求其调控细胞生长的浓度效应和时间效应。酶联免疫吸附试验(ELISA)检测TGFβ1作用于体外培养的外周血单个核细胞(PBMC)前后白细胞介素(IL)2和干扰素(IFN)γ的分泌。结果作用72h内TGFβ1对乳腺癌细胞有增殖抑制作用(P<0.05),不同的浓度(1.0～100.0)μg/L产生的效果不同。96h后效应减弱至消失。在TGF-β1作用下,PBMC培养上清中IL2(296.5±79.4)ng/L和IFNγ水平(665.3±107.0)ng/L明显低于无TGFβ1作用组(644.9±105.5)ng/L和(922.3±184.1)ng/L,(P<0.01)。结论TGFβ1对乳腺癌细胞的增殖有短暂抑制作用,在一定浓度范围内呈剂量依赖性,作用时间有限。TGF-β1能降低T细胞的细胞因子释放,抑制细胞免疫。     

Effects of basic fibroblast growth factor on biological characteristics of osteoblasts

Objective: To elucidate the effects of exogenous basic fibroblast growth factor ( bFGF ) on biological characteristics of rat osteoblasts cultured in vitro. Methods: The osteoblasts isolated from a Sprague-Dawley rat and cultured in vitro were treated with different concentrations of bFGF ( 5-50 ng/ml) respectively. At 24 hours after treatment, the proliferating cell nuclear antigen was measured with immunocytochemistry, alkaline phosphatase (ALP) activity was determined and the expression of transforming growth factor beta 1 ( TGF-β1 )was detected to observe the effects of bFGF on growth and differentiation of osteoblasts. Resu/ts: bFGF ( 5-50 ng/ml ) could obviously promote the growth of osteoblasts. The intracellular expression of TGF-β1 mRNA increased significantly, but the intracellular ALP content decreased. Conclusions: bFGF can obviously stimulate the proliferation of osteoblasts and promote the synthesis of TGF-β1, but cannot promote the differentiation of osteoblasts.     

Effect of insulin-like growth factor 1 and basic fibroblast growth factor on DNA synthesis and collagen production in cultured anterior cruciate ligament cells

This study was undertaken to investigate the effects of insulin-like growth factor 1 (IGF-1) and basic fibroblast growth factor (bFGF) on the DNA and matrix synthesis of cells out-grown from the anterior cruciate ligament (ACL). Five batches of ACL cells from five 8-week-old Japanese white rabbits were isolated and maintained in culture until the fifth passage. We analyzed the effects of various concentrations of IGF-1 (1–1000 ng/ml) on [³H]-thymidine uptake in the cells at the first and fifth passages, and collagen content in the cell layer at the third passage, in the presence or absence of bFGF (10ng/ml). In the absence of bFGF, IGF-1 caused a significant increase in the synthesis of DNA and collagen in the ACL cells. IGF-1 and bFGF, in combination, synergistically increased the DNA synthesis of ACL cells, whereas such synergistic enhancement was not observed in their, collagen production. The amounts of [³H]-thymidine incorporated into the cells incubated with IGF-1 (500ng/ml) and bFGF (10ng/ml) combined were 1.3–1.5 times greater at first passage and 1.3–1.9 times greater at fifth passage than the sum of these with the growth factors used individually. Based on this in vitro finding, we consider it clinically relevant that IGF-1 and bFGF, when used together, have the capability to enhance the primary healing of ruptured ACL. Presented at the 11th Annual Meeting for Orthopaedic Research of the Japanese Orthopaedic Association, Kagoshima, Japan, October 17, 1996.     

Effects of tamoxifen on normal human dermal fibroblasts

OBJECTIVE: To evaluate the effects of tamoxifen on the growth and autocrine growth factor production of human dermal fibroblasts from the face. METHODS: In vitro study of normal adult dermal fibroblast cells developed from surgical specimens in a serum-free model. Cell cultures were exposed to 5-, 8-, 12-, 16-, and 50-microg/mL concentrations of tamoxifen solution. Cell counts were performed, and the cell-free supernatants were collected at 0, 1, 3, 5, and 7 days after the initial exposure. Population doubling times were calculated, and supernatants were quantitatively assayed for basic fibroblast growth factor (bFGF), vascular endothelial growth factor (VEGF), and transforming growth factor (TGF) beta1. RESULTS: Tamoxifen appears to delay cellular proliferation rates in a dose-dependent manner up to a concentration of 12 microg/mL. Higher concentrations, approaching 50 microg/mL, appear to have a toxic effect on cell growth. The analysis of growth factor production revealed decreased levels of bFGF and VEGF but no change in the levels of TGF-beta1. CONCLUSIONS: The in vitro findings of delayed cell proliferation and decreased production of VEGF and bFGF in cells exposed to tamoxifen are consistent with previous in vivo reports of delayed wound healing but improved scar formation. The in vitro findings of growth factor modulation by tamoxifen provide cellular and molecular evidence supporting the clinical use of tamoxifen to ultimately improve scar formation.     

Glioblastoma and cerebral microvascular endothelial cell migration in response to tumor-associated growth factors

OBJECTIVE: Glioma cell migration is determined by a complex interplay between soluble motogens and extracellular matrix components. Several growth factors are thought to be involved in glioma cell migration; however, little is known about their motogenic potency relative to one another. METHODS: Using modified Boyden chamber assays, we compared the chemotactic effects of scatter factor/hepatocyte growth factor (SF/HGF), transforming growth factor (TGF)-alpha, TGF-beta1, TGF-beta2, epidermal growth factor (EGF), fibroblast growth factor (FGF)-1, FGF-2, insulin-like growth factor (IGF)-1, IGF-2, platelet-derived growth factor (PDGF)-AA, PDGF-BB, vascular endothelial growth factor (VEGF), pleiotrophin (PTN), and midkine (MK) in concentrations ranging from 1 pmol/L to 50 nmol/L on three different human glioblastoma cell lines. Checkerboard analyses distinguished between chemotaxis and chemokinesis. We further investigated the motogenic effects on human cerebral microvascular endothelial cells and analyzed receptor expression profiles. RESULTS: SF/HGF was the most potent chemotactic factor for all three glioblastoma cell lines, inducing up to 33-fold stimulation of migration. TGF-alpha showed the second strongest effect (up to 17-fold stimulation), and FGF-1 was also chemotactic for all three glioblastoma cell lines analyzed (maximal 4-fold effect). EGF, FGF-2, IGF-1, IGF-2, TGF-beta1, and TGF-beta2 were chemotactic for one or two of the cell lines (2- to 4-fold effects), whereas PDGF-AA, PDGF-BB, VEGF, PTN, and MK had no effect. In contrast, the most potent stimulators of cerebral microvascular endothelial cell migration were PDGF-AA (4-fold) and PDGF-BB (6-fold). CONCLUSION: The expression levels of SF/HGF and TGF-alpha as well as their respective receptors, MET and EGFR, are known to correlate with glioma malignancy grade. The particularly strong motogenic effects of these two growth factors suggest that they could be promising targets for an antimigratory component of glioma therapy, at least in comparison with the 12 other factors that were analyzed.     

碱性成纤维细胞生长因子转染对半月板纤维软骨细胞增殖、细胞周期及胶原合成影响的研究

目的探索携带碱性成纤维细胞生长因子(bas ic fibrob last grow th factor,bFGF)基因的重组慢病毒载体转染半月板纤维软骨细胞的效能,观察半月板纤维软骨细胞对bFGF基因转染的反应。方法将从1只3月龄新西兰大白兔分离培养的第1代半月板纤维软骨细胞分为实验组(A组)、对照组(B组)和空白组(C组),3组细胞分别以2×104个/孔接种于24孔培养板。细胞生长至60%融合时,A组与克隆有bFGF基因的重组慢病毒载体悬液共培养,B组与不携带任何基因的慢病毒悬液共培养,C组未接受外加处理。共培养48 h后检测3组的细胞周期、胶原合成能力、培养液中bFGF的表达及不同时间各组细胞的细胞增殖能力的变化。结果共培养48 h后在A组测出bFGF浓度为870±60 pg/m l,而B、C组培养液中未能检测出bFGF的表达;共培养6 d后,M TT法检测,A组吸光度(A)值0.427±0.037与B组0.320±0.042和C组0.308±0.034比较差异有统计学意义(P<0.01)。A组细胞周期较B、C组缩短,A组细胞G1期,S期和G2/M期的时间分别为16.28、12.60和11.04 h;而B、C组分别为23.61、16.90和21.33 h及21.56、19.80和21.41 h;A组与B、C组比较差异有统计学意义(P<0.05)。A组细胞每分衰变数(7 281.69±805.50)高于B组(5 916.40±698.11)和C组(5 883.57±922.63),比较差异有统计学意义(P<0.05)。结论借助慢病毒载体能有效实现bFGF基因在半月板纤维软骨细胞的转染;bFGF基因转染能促进半月板纤维软骨细胞的增殖和胶原合成能力。     

Basic fibroblast growth factor regulates expression of growth factors in rat epiphyseal chondrocytes.

Chondrocytes produce several local regulatory factors such as basic fibroblast growth factor (bFGF), transforming growth factor-beta (TGF-beta) and insulin-like growth factor-I (IGF-I). In this study, we examined the effect of bFGF on the expressions of both mRNA and protein of the growth factors synthesized by chondrocytes. Treatment of chondrocytes with bFGF (1-100 ng/ml) stimulated the mRNA expression of bFGF and TGF-beta up to 121-604% and 130-220% at 12 h compared with the controls, respectively. On the other hand, the treatment of chondrocytes with bFGF (1-100 ng/ml) suppressed IGF-I mRNA expression to 79-47% at 12 h compared with the controls. An enzyme-linked immunosorbent assay (ELISA) revealed that the treatment of chondrocytes with bFGF (1-100 ng/ml) also enhanced the production of TGF-beta proteins in the chondrocytes up to 299-508% at 24 h compared with controls. We conclude that bFGF influenced the local expression of growth factors by chondrocytes, suggesting autoregulation of growth factor expression during chondrogenesis.     

Growth factors and fibrochondrocytes in scaffolds.

Four growth factors, transforming growth factor-beta1 (TGF-beta1), platelet-derived growth factor-AB (PDGF-AB), insulin-like growth factor I (IGF-I), and basic fibroblastic growth factor (bFGF), were tested at different concentrations for their effects on extracellular matrix (ECM) production in three-dimensional cultures of meniscal fibrochondrocytes. Cells from New Zealand white rabbits were seeded on poly-glycolic acid (PGA) scaffolds and were stimulated with growth factors for three weeks. (3)H-proline and (35)S-sulfate labels were used to measure uptake of collagen and glycosaminoglycan (GAG) components, respectively. Biochemical assays were performed to measure the total collagen, GAG, and DNA present in the scaffolds at the end of the study. TGF-beta1 (10 and 100 ng/ml) stimulated both (3)H-proline and (35)S-sulfate uptake, showing a dose-dependent response for both and a temporal response for (35)S-sulfate uptake. IGF-I (5 ng/ml) and bFGF (25 and 100 ng/ml) showed increases in (3)H-proline uptake by the third week of growth factor addition. PDGF-AB did not show notable increases in uptake. Because TGF-beta1 (10 and 100 ng/ml) had visibly denser scaffolds, as evidenced by gross microscopy, at 100x, and the strongest uptake responses to both (35)S-sulfate and (3)H-proline, it appears to be the most effective growth factor for use in scaffold-based approaches to tissue engineer the knee meniscus.     

诱导骨髓间充质干细胞向软骨细胞分化的体外研究

目的 探讨转化生长因子β1（transforming growth factor β1，TGF—β1）、胰岛素样生长因子1（insulinlike growth factor1，IGF-1）在诱导骨髓间充质干细胞（marrow mesenchymal stem ceils，MSCs）向软骨细胞分化过程中的相互作用，并研究细胞密度对MSCs向软骨细胞分化的影响。方法 取健康昆明种小白鼠骨髓，用全骨髓贴壁法筛选获得MSCs，体外培养传代。采用特定的诱导培养使MSCs向软骨细胞分化，按培养基内添加生长因子的不同分成3个实验组和对照组。实验组分别为：TGF—β1＋IGF-1联合应用组（TGF—β1 10ng／ml、IGF-1 50ng／m1）；TGF—β1单独应用组（TGF—β1 10ng／m1）；IGF-1单独应用组（IGF-1 50ng／m1）；对照组不添加任何生长因子。TGF—β1＋IGF-1联合应用组于诱导14d和21d，分别进行甲苯胺蓝染色及免疫荧光双染法鉴定；于诱导7、14和21d各组分别提取诱导细胞总RNA，进行RT—PCR扩增，检测TGF—β1、IGF-1对诱导细胞Ⅱ型胶原表达量的影响；比较MSCs在平板培养及细胞团培养时，Ⅱ型胶原表达量的差异。结果TGF—β1＋IGF-1联合应用组诱导培养14d，诱导软骨细胞甲苯胺蓝染色呈阳性，免疫荧光染色可见诱导软骨细胞的细胞外基质含有Ⅱ型胶原。各组基因扩增产物的凝胶电泳可见，TGF—β1＋IGF-1联合应用组和TGF—β1单独应用组Ⅱ型胶原扩增片段呈阳性；IGF-1单独应用组和对照组，未见Ⅱ型胶原扩增条带；凝胶成像系统灰度扫描示Ⅱ型胶原表达量TGF—β1＋IGF-1联合应用组各时间点均比TGF—β1单独应用组明显增加（P〈0．05）。细胞团培养模式下，诱导细胞表达Ⅱ型胶原比平板培养模式更加显著。结论 MSCs向软骨细胞诱导分化时，IGF-1对TGF—β1有明显的促进作用；细胞培养密度提高有利于MSCs成软骨细胞表型。