辛伐他汀体内给药对大鼠骨量和骨髓基质干细胞增殖分化的影响

背景：辛伐他汀对正常大鼠骨代谢及骨髓基质干细胞增殖分化影响的报道目前不多。 目的：观察辛伐他汀体内给药对大鼠骨量和骨髓基质干细胞增殖、分化的影响,及其在此过程中Smad1,2,7 mRNA表达水平的变化。 方法：16只6周龄雌性SD大鼠按体质量随机均分成2组,对照组每天灌胃蒸馏水,实验组灌胃辛伐他汀20 mg/(kg•d),持续9周。于最后一次灌胃的第2天取左侧股骨行骨密度和骨组织形态计量学测定;取右侧股骨和胫骨骨髓基质细胞向成骨方向诱导培养,并采用CCK-8法检测定向成骨分化中的骨髓基质干细胞的增殖能力;细胞培养第16,28天检测碱性磷酸酶比活性、碱性磷酸酶染色阳性细胞比;细胞培养第21天,提取总RNA,采用Real-time RT-PCR检测Smad1,2,7的mRNA表达。 结果与结论：辛伐他汀体内给药干预9周后,大鼠骨量和骨密度无显著变化,体外培养骨髓基质干细胞所有检测基因mRNA水平、细胞增殖能力、细胞外基质矿化能力、碱性磷酸酶比活性、碱性磷酸酶染色阳性细胞比两组间差异均无显著性意义 (P > 0.05)。结果显示20 mg/(kg•d)辛伐他汀体内给药9周对大鼠骨量及骨髓基质干细胞的增殖和分化及Smad1,2,7的表达无显著作用。     

洛伐他汀对尾悬吊大鼠骨量及其骨髓基质干细胞增殖、分化的影响

背景：诸多临床和基础研究均发现他汀类药物具有成骨潜能,但未能完全证实他汀类药物促骨形成的作用。 目的：观察洛伐他汀体内给药对尾悬吊大鼠骨量和骨髓基质干细胞增殖﹑分化的影响,并探讨洛伐他汀防治失重型骨质疏松的作用潜能。 方法：18只雄性SD大鼠随机均分成对照组、尾悬吊组和悬吊给药组。对照组和尾悬吊组每天蒸馏水灌胃;悬吊给药组每天20 mg/kg洛伐他汀灌胃;两悬吊组大鼠后肢离地进行尾部悬吊,4周后处死所有大鼠。 结果与结论：与对照组比较,两悬吊组股骨各段骨密度、小梁相对体积、骨形态发生蛋白2 mRNA表达水平明显降低;骨小梁分离度、骨吸收周长百分数、破骨细胞数、类骨质周长百分数、碱性磷酸酶活性比及碱性磷酸酶mRNA表达水平显著增高;细胞增殖能力各组间差异无显著性意义。说明尾悬吊4周可导致大鼠骨量丢失;洛伐他汀体内给药不能阻止尾悬吊大鼠股骨骨量丢失,给药早期骨髓基质干细胞向成骨分化能力更强。     

Regulation of constitutive bone marrow cell proliferation by bone marrow suppressor cells

Bone marrow (BM) cells have previously been shown to suppress specific immune responses of cells from peripheral lymphoid organs. The present report describes a suppressor cell present in normal rabbit BM, which regulated the constitutive proliferation of other BM cells. The suppressor cells were Fc gamma-receptor-positive (Fc gamma R+) complement-receptor-negative, and nonadherent or weakly adherent. Similar suppressive activity was not detected among rabbit spleen cells. Removal of Fc gamma R+ suppressor cells allowed greater than 10-fold increases in the proliferation of Fc gamma R- BM cells. Addition of Fc gamma R+ BM cells to Fc gamma R- cells efficiently blocked proliferation. The suppressor cells acted by inhibiting the elaboration of a soluble growth-promoting factor by cells in the Fc gamma R- population. The growth-promoting factor enhanced proliferation of unseparated rabbit BM cells and peripheral blood mononuclear cells.     

Differential activities of rabbit bone marrow suppressor cells

A population of nonadherent Fc gamma-receptor-bearing (Fc gamma R+) suppressor cells in normal rabbit bone marrow (BM) which inhibited the constitutive proliferation of other BM cells has been previously described. Suppression was by blocking the release of a soluble growth-promoting factor. In the present report, it was found that the Fc gamma R+ BM suppressor cells, which were suppressive to background proliferation, were not suppressive to lymphocyte activation by immune complexes (IC). Adherent BM cells showed suppressive activity toward IC stimulation, but none toward constitutive BM proliferation. IC-induced proliferation was enhanced by the soluble growth factor, but only in the absence of adherent cells. Adherent cells did not affect growth factor enhancement of constitutive proliferation, suggesting that different cell populations were affected. Depletion of the Fc gamma R+ suppressor cells promoted growth of cells which subsequently developed Fc gamma R+, increasing the possibility of interaction with IC, which also preferentially induced Fc gamma R+ cells.     

骨髓间充质干细胞对骨髓CD34~+细胞增殖影响的体外研究

研究骨髓间充质干细胞(bone marrow mesenchymal stem cell,BMMSC)对骨髓CD34+细胞增殖的影响,为骨髓CD34+细胞体外扩增的深入研究提供依据。用MACS进行骨髓CD34+细胞的分选;用流式细胞术进行CD34+细胞纯度鉴定;用密度梯度离心法分离引产胎儿骨髓单个核细胞,结合贴壁法进行BMMSC的体外扩增培养;用流式细胞术进行BMMSC表面标志鉴定;用Transwell培养板培养CD34+细胞与BMMSC;用自动细胞计数仪计数有活性的CD34+细胞数量;用MTT比色法检测骨髓CD34+细胞增殖活性。流式细胞术检测结果显示分选所得的CD34+细胞纯度达到90%以上;流式细胞术检测显示传至第3代继续培养72h后的BMMSC高表达CD44、CD29,而HLA-DR、CD45、CD34表达阴性,说明所培养的BMMSC纯度很高;Transwell培养板培养CD34+细胞与BMMSC,在倒置显微镜下观察以及自动细胞计数仪计数发现,实验组有活性的CD34+细胞数量高于对照组(P<0.05);采用MTT比色法检测骨髓CD34+细胞的增殖活性,实验组高于对照组(P<0.05)。以上结果说明BMMSC有促进骨髓CD34+细胞增殖的作用,这种作用可能与其分泌的细胞因子有关。     

Reimmigration of bone marrow stem cells in rats

One limb (crus) or all four limbs in rats were irradiated with x-rays in a dose of 1500 R, sufficient to inactivate bone marrow, and 3, 24 h, or 6 days later the rest of the body was irradiated in doses of 800 or 900 R, the previously irradiated region being screened. The percentage of rats which survived was the same as when the unirradiated limbs were screened. It was suggested that stem cells migrate from the unirradiated bone marrow into its irradiated part (the crus), in which they survive and are able to migrate again (reimmigrate) in the case of subsequent irradiation of the rats in a lethal dose with screening of the limb. Rats differ from mice in the greater severity of their intestinal syndrome, which depends only to a small extent on migration of stem cells. It is therefore best to judge the effectiveness of stem cell migration chiefly on the basis of survival of the animals during the period of bone marrow death. It can be concluded from analysis of the mortality of the rats in this period that their survival, based on reimmigration after screening of one limb, with a three-hour interval between irradiations, is only half that of mice. Reimmigration of stem cells thus takes place in the rats just as in mice, but it plays a significant role in rats only if the volume of previously irradiated and subsequently screened bone marrow is greater or if the time interval between irradiations is longer.Central Roentgeno-Radiologic Scientific-Research Institute, Ministry of Health of the USSR, Leningrad. (Presented by Academician of the Academy of Medical Sciences of the USSR V. N. Chernigovskii.) Translated from Byulleten' Éksperimental'noi Biologii i Meditsiny, Vol. 87, No. 6, pp. 589–591, June, 1979.     

胰岛素样生长因子结合蛋白-4对大鼠骨髓间充质干细胞增殖和神经分化的影响

目的探究胰岛素样生长因子结合蛋白4(IGFBP4)对骨髓间充质干细胞(BMSC)增殖和神经分化的影响。方法通过全骨髓贴壁法分离培养BMSCs,免疫荧光检测IGFBP4在P1、P4、P6、P8和P10 BMSCs的表达。取第4代BMSC细胞,分为单纯培养基组和添加IGFBP4组,用CCK8试剂盒检测单纯培养基组和添加IGFBP 4组吸光度值A450 nm。再将BMSC细胞分为3组:neurocult组、EGF+b FGF组、EGF+b FGF+IGFBP4组,每组连续测定7 d,每天6个平行孔,诱导培养基Neuro Cult培养再分别添加EGF+b FGF和EGF+b FGF+IGFBP4,诱导其向神经祖细胞分化,免疫荧光染色检测Nestin和Sox-2表达,并观察神经球数量和细胞增殖活性。结果成功获得原代大鼠BMSCs,可见CD105、CD44和CD90表达,IGFBP4的表达随培养代数而增加,外源IGFBP4能明显抑制BMSCs的增殖(P0.05)。经诱导BMSCs形成的神经球样结构表达Nestin和Sox-2,细胞增殖活性升高(P0.05)。结论 IGFBP4能抑制BMSCs的增殖,促进其向神经祖细胞分化。     

富血小板血浆促进骨髓间充质干细胞的增殖

背景：富血小板血浆含有多种刺激因子,且能上调蛋白多糖及胶原合成。目的：观察山羊富血小板血浆对山羊骨髓间充质干细胞增殖的影响。方法：抽取6月龄的内蒙古锡盟山羊颈静脉血,采用二度离心法获取富血小板血浆,运用骨髓穿刺包从山羊髂骨上抽取骨髓,采用密度梯度离心方法分离、纯化获得山羊骨髓间充质干细胞,然后取生长状态较好的原代细胞,加入含体积分数为10%,20%,30%富血小板血浆的L-DMEM完全培养基进行培养,对照组只用L-DMEM完全培养基培养。结果与结论：在2-6 d期间,富血小板血浆各组明显比对照组细胞增殖迅速,而且体积分数越高细胞生长的速度越快,生长的数目越多,细胞形态越成熟。培养第4天时,体积分数为10%,20%,30%富血小板血浆组细胞倍增时间约为50 h,35 h,25 h。结果表明山羊富血小板血浆能明显促进骨髓间充质干细胞的增殖,而且富血小板血浆体积分数越大促增殖能力越显著。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;组织工程全文链接：     

血管内皮祖细胞改善骨质疏松大鼠骨髓间充质干细胞的增殖及凋亡

BACKGROUND: Previous studies have found that estrogen deficiency causes a reduction in the activity of bone marrow mesenchymal stem cells (BMSCs). OBJECTIVE: To explore the effect of endothelial progenitor cells (EPCs) on the BMSCs proliferation and apoptosis ability of osteoporosis rats. METHODS: Healthy female Sprague-Dawley rats, 6 weeks old, were enrolled and subjected to bilateral ovariectomy to make osteoporosis models. BMSCs and EPCs were isolated using density gradient centrifugation combined with adhesion method, and identified with surface markers, cell proliferation and immunocytochemistry in vitro. We used Transwell inserts to establish EPCs and OVX-BMSCs indirect co-culture system. Control groups were OVX-BMSCs group and sham-BMSCs group in which rats were only subjected to remove the equal amount of fat tissues around the ovary. Flow cytometry was applied to detect BMSCs proliferation and apoptosis ability. RESULTS AND CONCLUSION: Compared with the control groups, the results of flow cytometry test showed that the proportion of OVX-BMSCs at S phase was significantly increased at 3 days of indirect co-culture with EPCs and the apoptosis rate was significanty reduced at 10 days of indirect co-culture with EPCs (both P < 0.05). These results suggest that EPCs can promote the proliferation but inhibit the apoptosis of OVX- BMSCs. 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      

吡格列酮促进大鼠骨髓内皮祖细胞的增殖

背景：内皮祖细胞具有增殖、迁移和分化为内皮细胞的特征,对冠状动脉硬化性心脏病及糖尿病心血管并发症的发生、发展可能起着重要作用。 目的：探讨选择性过氧化物酶体增殖物激活受体γ激动剂吡格列酮对大鼠骨髓内皮祖细胞增殖的影响及相关机制。 方法：①采用密度梯度离心法和差速贴壁法培养大鼠骨髓内皮祖细胞,置于含0,1,10,50,100,200 μmol/L吡格列酮的培养基中培养,观察吡格列酮促进内皮祖细胞增殖的最佳浓度。②将培养7 d的内皮祖细胞随机分5组：对照组加含二甲基亚砜的培养液;吡格列酮组加入50 μmol/L吡格列酮;PPAR-γ拮抗剂组加入50 μmol/L吡格列酮及10 μmol/L过氧化物酶体增殖物激活受体γ拮抗剂GW9662;PI3K/Akt阻滞剂组加入50 μmol/L吡格列酮及50 μmol/L磷脂酰肌醇3-激酶/蛋白激酶B通道阻滞剂Wortmannin;ERK阻滞剂组加入50 μmol/L吡格列酮及20 μmol/L细胞外调节蛋白激酶通道阻滞剂PD98059,观察不同组内皮祖细胞的增殖情况。 结果与结论：倒置显微镜下见培养前4 d细胞增殖不明显,第5-10天迅速增殖,并可见细胞集落及线状结构形成,第10天可达80%融合。培养第7天的内皮祖细胞具有吞噬Dil标记的乙酰化低密度脂蛋白和FITC标记的荆豆凝集素1的功能。10-200 μmol/L的吡格列酮均可明显促进内皮祖细胞的增殖(P < 0.01),以50 μmol/L吡格列酮的作用最明显。进一步阻断相关信号通路发现,Wortmannin和GW9662可明显拮抗吡格列酮的促细胞增殖作用,而PD98059对吡格列酮的作用无影响。说明吡格列酮促进大鼠骨髓内皮祖细胞增殖的作用是通过磷脂酰肌醇3-激酶/蛋白激酶B信号通路介导的。     

衰老模型骨髓基质细胞抑制造血细胞增殖分化

目的研究衰老骨髓基质细胞对骨髓造血细胞增殖分化能力的影响,为阐述机体造血微环境衰老对造血干/祖细胞增殖的影响提供实验依据。方法全骨髓贴壁法体外培养大鼠骨髓基质细胞,分为对照组和衰老组。衰老组:常规培养基内加入30 mg/m L D-半乳糖作用48 h。CCK-8法测定BMSCs增殖;流式细胞术分析细胞周期;β-半乳糖苷酶(SA-β-Gal)染色观察衰老BMSCs百分率;Western blot检测P16、P21和P53蛋白表达。骨髓造血细胞与BMSCs共培养,集落计数检测髓系多向性造血祖细胞(CFU-Mix)增殖分化。ELISA检测BMSCs培养上清液中IL-1β、GM-CSF和SCF含量;DCFH-DA流式荧光检测BMSC活性氧簇(ROS)水平;酶学法检测BMSCs内过氧化物丙二醛(MDA)含量和总超氧化物歧化酶(SOD)活性。结果与对照组相比,D-半乳糖诱导BMSCs衰老,细胞阻滞于G0/G1期(P0.01),增殖能力显著下降,SA-β-Gal染色阳性率升高(P0.01);衰老相关蛋白P16、P21和P53表达明显上调(P0.01)。与衰老BMSCs共培养的骨髓造血细胞增殖分化能力减弱。衰老BMSCs内ROS、MDA氧化损伤指标上升,SOD抗氧化指标下降(P0.01);BMSCs培养上清液IL-1β、GM-CSF和SCF含量明显下降(P0.01)。结论衰老骨髓基质细胞抑制造血细胞增殖、分化能力,其机制可能与骨髓基质细胞氧化损伤,分泌活性因子改变有关。     

Effect of platelet growth factors on proliferation of guinea pig bone marrow and splenic stromal precursor cells and proliferation of cultural descendants from bone marrow precursor cells

Elimination of platelets from guinea pig splenocyte suspension (laking megakaryocytes) with EDTA considerable reduces the efficiency cloning of splenic stromal precursor cells. It means that platelet-derived growth factors are necessary for stromal precursor cells from different organs (bone marrow, thymus, and spleen). The dependence on the platelet growth factors can vary within a wide range in descendants from cultured bone marrow precursor cells (passaged bone marrow fibroblasts at different stages of differentiation.     

芍药苷对骨髓间充质干细胞增殖的影响

背景：研究显示芍药苷具有补血及治疗自身免疫性疾病的功效,骨髓间充质干细胞对机体的造血及免疫功能也起着重要的作用,但芍药苷对骨髓间充质干细胞的增殖及细胞因子的分泌和表达有何影响报道较少。 目的：探讨芍药苷对人骨髓间充质干细胞增殖及白细胞介素6表达的影响。 方法：采用密度梯度离心法和贴壁培养法体外分离培养人骨髓间充质干细胞,用流式细胞术和成脂及成骨诱导法鉴定人骨髓间充质干细胞生物学特性,MTT法检测不同浓度芍药苷对人骨髓间充质干细胞增殖的影响,ELISA 法测定芍药苷干预人骨髓间充质干细胞后培养上清液中白细胞介素6的分泌水平,RT-PCR 检测芍药苷干预后白细胞介素6 mRNA的表达情况。 结果与结论：成功分离出骨髓间充质干细胞,具有成骨、成脂分化潜能。与对照组相比,芍药苷浓度为2 μmol/L和10 μmol/L可明显促进骨髓间充质干细胞增殖。10 μmol/L芍药苷干预骨髓间充质干细胞后,G₀/G₁期细胞比例显著降低,S期细胞比例显著升高。10 μmol/L芍药苷干预组骨髓间充质干细胞白细胞介素6的分泌和mRNA表达均显著高于对照组(P < 0.01)。由此得出,一定浓度的芍药苷可促进骨髓间充质干细胞增殖,并提高骨髓间充质干细胞分泌白细胞介素6水平和基因表达。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;组织工程全文链接：     

仙灵骨葆对骨质疏松大鼠骨量及骨髓基质干细胞成骨分化的影响

背景：双侧卵巢切除可造成大鼠骨量丢失,仙灵骨葆作为传统中药具有一定的促进骨形成作用。 目的：观察仙灵骨葆体内给药对骨质疏松大鼠骨量及骨髓基质干细胞成骨分化能力以及相关因子表达的影响。 方法：3月龄雌性SD大鼠24只随机数字表法均分为3组,卵巢切除组和仙灵骨葆组行卵巢切除,造模6周后仙灵骨葆组给予仙灵骨葆250 mg/(kg•d),干预8周;正常对照组不予干预。 结果与结论：卵巢切除组L2-L4椎体骨密度显著低于其他两组,仙灵骨葆组仍显著低于正常对照组(P < 0.05);卵巢切除组血清骨钙素、骨髓基质干细胞的骨形态发生蛋白2、骨钙素mRNA水平均低于其他两组(P < 0.05)。细胞外基质矿化能力亦明显低于正常对照组和仙灵骨葆组。提示大鼠去势14周后骨量丢失显著,仙灵骨葆可部分阻止其骨量丢失,其作用机制可能与促进大鼠骨髓基质干细胞的成骨分化有关。     

Factors influencing proliferation and histamine content of cultured human bone marrow cells

Various human lymphokines such as semipurified human interleukin 3 (IL 3), recombinant human IL 3, granulocyte colony stimulating factor (G-CSF), and recombinant human interleukin 4 (IL 4) stimulated growth of human bone marrow cells, but from all these factors tested, only IL 3 by itself was able to cause an increase in histamine content. Fibroblast monolayers as well as factors in their supernatants also increased proliferation and histamine content of bone marrow cells. Concentrated supernatants (Mr greater than 10,000) also inhibited cell proliferation and induced histamine content. The same fraction concentrated on a Mr cut-off greater than 50,000 enhanced cell growth and the total histamine content per culture. Thus, fibroblast supernatants contained both growth promoting and inhibitory factors. However, using the rat basophilic leukemia (RBL) cell line as a test system for such fibroblast-derived differentiation factors, we showed that if cell proliferation was inhibited, histamine content was also enhanced. Furthermore, certain drugs known to inhibit cell division, such as sodium butyrate or hydroxyurea, were also found to cause an increase in histamine content of RBL cells. Thus, our data demonstrate that basophil/mast cell differentiation, in terms of augmentation of cellular histamine levels, may be achieved by exposure to certain growth-inducing cytokines, factors inhibiting proliferation or pharmacological agents which inhibit cell proliferation.     

骨髓基质细胞促进神经干细胞增殖分化

目的：探讨骨髓基质细胞（BMSCs）对神经干细胞（NSCs）增殖分化的影响。 方法:在体外比较NSCs在单独培养和在BMSCs条件培养液中培养下的分化和增殖情况。 结果:应用BMSCs条件培养液培养NSCs，分化的神经元比例较显著高于NSCs单独培养（41.1%±3.2% vs 23.3%±16.5%，P<0.05），而分化的星形胶质细胞所占比例显著降低（33.8%±4.9% vs 65.0%±10.4%，P<0.01），同时增殖细胞所占比例也显著增高（74.7％±4.7％ vs 51.4％±12.3％，P<0.01）。 结论:BMSCs对NSCs有促进其增殖和向神经元分化的作用。NSCs与BMSCs联合移植可能会增强NSCs移植的抗脑损伤作用。     

大鼠骨髓间充质干细胞增殖及定向分化能力的增龄性变化

背景：自体骨髓间充质干细胞移植治疗心血管疾病已经成为当前研究的热点之一,但是患者自体骨髓间充质干细胞的增殖能力及向心肌样细胞方向分化的能力是否随年龄的改变而有所变化尚不清楚。 目的：探讨大鼠骨髓间充质干细胞生物学特性的增龄性差异。 方法：纯化培养不同年龄组SD大鼠骨髓间充质干细胞,流式细胞仪分析其细胞周期,同时骨髓间充质干细胞与乳鼠心肌细胞共培养,细胞免疫荧光技术分析骨髓间充质干细胞心肌肌钙蛋白T的表达。 结果与结论：流式细胞仪分析显示处于G₀/G₁期骨髓间充质干细胞的百分率随年龄的增加而增加;骨髓间充质干细胞的肌钙蛋白T表达率亦随年龄的增加而减少。结果表明大鼠骨髓间充质干细胞的增殖与定向分化能力随着年龄的增长而下降。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;组织工程全文链接：     

黄嘌呤核苷促进骨髓间质干细胞体外快速扩增的实验研究

目的:探讨黄嘌呤核苷(Xs)对骨髓间质干细胞(BMSCs)增殖及分化状态的影响。方法:将Xs加入骨髓间质干细胞培养体系,观察它对骨髓间质干细胞增殖和分化特性的影响。结果:在Xs的影响下,传至第10代的细胞生长速率与第4代的细胞基本保持一致,无下降趋势。而对照组细胞(无Xs影响)传至第10代时,生长速率则有明显下降。经Xs促进增殖的骨髓间质干细胞仍能保持足够的肝向分化能力。结论:Xs作为非平衡细胞动力学分裂方式的抑制剂,既能实现骨髓间质干细胞的分裂方式由非平衡态向平衡态转变,又不影响其肝向分化的特性,有助于提高骨髓间质干细胞的体外增殖效率,有着广泛的应用空间。     

全骨髓贴壁接触培养SD大鼠骨髓间充质干细胞

背景：体外分离培养出生长状态好、高纯度、增殖能力强和数量充足的大鼠骨髓间充质干细胞,是将其作为种子细胞用于组织和细胞移植的重要前提。 目的：建立简便、快速、有效的SD大鼠骨髓间充质干细胞体外分离培养方法,并观察其生物学特性。 方法：采用全骨髓法将SD大鼠双侧股骨和胫骨骨髓细胞进行体外分离培养,贴壁接种法进行细胞纯化、传代。观察细胞生长形态及特征,绘制细胞生长曲线,检测细胞表面标记物,采用体外诱导剂诱导细胞分别向成骨、成软骨、成脂方向分化。 结果与结论：全骨髓贴壁接种法分离培养的骨髓间充质干细胞生长旺盛、纯度高,细胞生长形态呈长梭形,极性排列,细胞生长呈S形生长曲线,群体倍增时间为29 h,细胞在连续传10代后仍具有较强的增殖能力。第3代骨髓间充质干细胞的表面标记物CD44、CD29、CD90均呈阳性表达,CD45、CD34、CD11b则呈阴性表达。第3代骨髓间充质干细胞分别经成骨、成软骨、成脂诱导剂诱导后,茜素红染色、碱性磷酸酶染色、von-kossa矿化结节染色、甲苯胺蓝染色和油红O染色均呈阳性。结果验证全骨髓贴壁接种法是一种简便可靠的体外分离培养方法,能获得纯度较高的骨髓间充质干细胞,经实验鉴定第3代骨髓间充质干细胞生物活性最佳,且具有多向诱导分化能力,适合作为后续实验的种子细胞。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;组织工程全文链接：     

大鼠骨髓间充质干细胞分化为神经干细胞

为了观察骨髓间充质干细胞(BMSCs)分化为神经干细胞(NSCs)的能力,本研究通过贴壁法培养大鼠BMSCs,体外培养扩增纯化后,在细胞传代时用含有表皮生长因子(EGF)、碱性成纤维细胞生长因子(bFGF)、N2、B27的DMEM/F12的培养液制成细胞悬液,并进行诱导,观察诱导后细胞的形态及生长情况,用免疫荧光检测形成的细胞球的巢蛋白(nestin)的表达情况;形成的细胞球在含10%血清的培养液中进一步分化。结果显示:BMSCs在含EGF、bFGF、N2、B27的培养液中,逐渐形成nestin表达阳性的细胞球,在含血清的培养液中能分化为神经元样细胞、星形胶质样细胞及少突胶质样细胞。本研究结果提示经纯化的BMSCs能分化为NSCs,并具有进一步分化的能力。