共查询到19条相似文献,搜索用时 78 毫秒
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目的:研究血管内皮生长因子(vascular endothelial growth factor,VEGF)体外促进小鼠胚胎干细胞系ES-D3生成CD34 细胞的能力.方法:将ES-D3形成拟胚体,将拟胚体细胞转入含不同浓度的VEGF和VEGF 干细胞因子(stem cellfactor,SCF)的培养基中.实验分6组,分别为VEGF 5μg/L组、VEGF 10 μg/L组、VEGF 20μg/L组、VEGF 5μg/L SCF组、VEGF 10μg/L SCF组、VEGF20μg/L SCF组,同时设不加因子的自发分化对照组.RT-PCR检测CD34 mRNA的表达,流式细胞仪检测CD34 细胞的比例,甲基纤维素半固体培养法检测生成造血集落的能力.结果:经过1周的诱导培养,实验组生成的细胞可以表达CD34 mRNA,CD34 细胞的比例也升高,并可形成造血祖细胞的集落.从CD34 mRNA的表达水平、诱导生成CD34 细胞的比例和生成的集落数量看,VEGFμg/L SCF组和VEGF 10μg/L SCF组的诱导效率最高.结论:VEGF能够促进ESC生成CD34 细胞,尤以与SCF合用时,其诱导效率更高. 相似文献
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慢性粒细胞白血病(CML)是一种起源于骨髓多能造血干细胞的恶性克隆性疾病,其中90%以上的病例具有ph染色体,其分子基础是bcr/abl基因重排.CD34抗原是一种表达于造血干/祖细胞的膜表面糖蛋白,正常CD+34细胞亚群中90%以上为祖细胞和干细胞,骨髓中约1.5%的单个核细胞表达CD34抗原,未经刺激的外周血中0.1%~0.2%的单个核细胞为CD+34,体内单独或联合应用造血生长因子能够提高外周血中CD+34细胞的数量,并有效地应用于外周血干细胞移植(PBSCT). 相似文献
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自体CD34~+细胞移植治疗晚期肿瘤 总被引:1,自引:0,他引:1
目的 采用CD34+ 细胞体外分选技术对晚期肿瘤患者进行自体CD34+ 细胞移植 ,以降低自体移植后肿瘤复发率。方法 对 15例Ⅲ~Ⅵ期肿瘤患者 (多发性骨髓瘤 11例 ,乳癌 2例 ,非霍奇金淋巴瘤和髓母细胞瘤各 1例 )采用CliniMACS临床型细胞富集仪 ,利用磁性分选技术收集CD34+和CD34-细胞组分 ,患者于预处理后 ,输注分选后的CD34+ 细胞。结果 CD34+ 细胞体外纯化富集可使CD34-细胞获得 2 .0~ 5 .0个对数的去除 ;回输CD34+ 细胞中位数为 2 .4× 10 6/kg,CD34+ 细胞回收率为 6 4 % ,纯度为 98.2 % ;移植后白细胞恢复至 >1.0× 10 9/L和血小板 >2 0× 10 9/L的天数 (中位数 )分别为 14d和 13d。患者总体生存率 6 6 .7% (10 / 15 ) ,无疾病生存率 5 3.3% (8/ 15 )。结论 CD34+ 细胞移植后获得迅速、稳定的造血重建。体外CD34+ 细胞纯化富集后移植可望提高晚期肿瘤患者自体移植疗效。 相似文献
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脐血CD34~+细胞扩增中系特异性分化抗原的变化 总被引:4,自引:0,他引:4
目的:探讨CB CD34^ 细胞扩增的最佳HGF组合及移植时机。方法:CB CD34^ 细胞培养于无血清培养液中,分别加入下列HGF,A组:对照组(无HGF);B组:SCF,IL-3,IL-6;C组:SCF,IL-3,IL-6,G-CSF,Epo;D组:SCF,IL-3,IL-6,TPO,Flt3-L;E组:SCF,IL-3,IL-6,TPO,Flt3-L,G-CSF,Epo。培养22d,对不同培养时间的细胞进行NC数量及系特异性CD动态观察。结果:同对照组相比,扩增组NC和CD34^ 细胞均有不同程度的扩增。NC和CD34^ 细胞扩增高峰分别在第10天和第6天。E组的扩增效果最佳。CD检测显示,各组CD34^ 及CD34^ CD^38-细胞的比例逐渐减少,但B,D2组的CD34^ CD38^-细胞的比例在第6天有一过性回升,CD154^ ,CD13^ ,CD61^ 及Gly-A^ 细胞的比例则逐渐升高,D组CD34^ 及CD34^ ,CD38^-细胞的比例明显地高于E组(P<0.01),CD3^ 和CD19^ 细胞的比例在扩增中呈下降趋势,结论:HSPC分化程度与HGF组合及培养时间有关。就细胞总数而言,E组HGF组合最佳,但就HSPC含量来说,以D组为优,第1周扩增产物中HSPC含量较高,移植时间以扩增的第6-10天为宜。 相似文献
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诱导体外扩增的小鼠骨髓CD34+造血细胞分化为树突状细胞 总被引:13,自引:0,他引:13
诱导体外培养扩增后的小鼠骨髓CD34+造血细胞分化为树突状细胞(DC)。方法C57BL/6j小鼠骨髓CD34+细胞采用血管内皮细胞共培养方法进行体外扩增,扩增后的CD34+细胞经磁性细胞分选技术纯化,并用GM┐CSF等细胞因子诱导其向DC分化。结果小鼠骨髓CD34+造血细胞不论是否经过体外培养均可被诱导分化为DC,后者具有典型的树突状形态特征,表达高水平的MHCⅠ、Ⅱ类抗原和CD86共刺激分子,在混合白细胞反应(MLR)中能有效地刺激静息期T淋巴细胞增殖。结论小鼠骨髓CD34+细胞经体外培养扩增后仍然具有向DC分化的能力,通过骨髓细胞体外培养扩增可以显著提高DC产量。 相似文献
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人类肿瘤生长伴随血管生成早在一个多世纪前就被发现[1]。几十年对血管分子机制的研究,发现有很多种生长因子对肿瘤血管生成是有促进作用的,如血管内皮生长因子(VEGF)、成纤维生长因子(FGF)、血小板源性生长因子(PDGF)等,其中最重要的生长因子是VEGF[2],无论在生理 相似文献
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Until recently, it was thought that the most primitive HSC have a fixed phenotype within a hierarchical differentiation system, and that changes in engraftment and renewal potential occur in a stepwise fashion linked with differentiation. In this review, we summarize the data from several different species and different animal models of hematopoietic stem cell function. Taking into account all of the published data, it becomes clear that the hematopoietic stem cell compartment contains more than one phenotypically identifiable population capable of self-renewal and long term pluripotent engraftment. It is clear that some stem cells express CD34, and others do not. The exact phenotypic progression between these cells needs to be further defined, because different in vivo and ex vivo manipulations may shift the stem cells from one phenotype to another, and this can complicate interpretation of experimental transplant data. 相似文献
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目的:利用体外管腔形成模型,研究血管内皮生长因子(VEGF)对肿瘤血管内皮细胞(TECs)调控的精准性,探讨以 VEGF 为靶点的抗肿瘤药物在临床应用中出现缺陷的潜在机制。方法采用 CD31免疫磁珠分选人肝癌标本中的 TECs,在含 Matrigel 基质胶的96孔板中,分别与不同浓度 VEGF 共培养,观察不同时间的 TECs 体外管腔形成能力,以正常人脐静脉血管内皮细胞( HUVECs)为对照。结果1)体外分离培养的 TECs 拟血管内皮细胞梭状形态,其96%的细胞表达内皮细胞特异性标记 CD31;2)TECs 在微小量(基础培养条件,2 ng·mL -1)VEGF165时,体外管腔形成较少或不成腔,而对照组 HUVECs 却能形成明显的管腔并分支成网;当附加10 ng·mL -1 VEGF165时,在4 h 观察到 TECs 如同 HUVECs 形成了管腔,在6 h 出现明显的分支网;然而,当附加20 ng·mL -1 VEGF165时,在6 h 观察到 TECs 形成的管腔明显减少;统计分析显示,10 ng·mL -1 VEGF165组 TECs 成管能力比2 ng·mL -1 VEGF165组高出6倍( P ﹤0.001),而20 ng·mL -1 VEGF165组 TECs 成管能力显著下降至10 ng·mL -1 VEGF165组的4.5倍(P ﹤0.001);3)10 ng·mL -1 VEGF165组在培养4、6、8 h 均可见 TECs 管腔形成,但以6 h 为显著;在20 h 时,TECs 的管腔消失,而对照组 HUVECs 却还有明显的管腔分支网。结论肝癌 TECs 体外管腔形成对 VEGF165既有依赖性但又有量-效局限性,过高 VEGF 浓度能抑制性影响 TECs(而不是 HUVECs)管腔形成能力。在 VEGF 的刺激下,TECs 体外管腔形成的时效性短于 HUVECs。我们的实验结果提示,临床应用抗 VEGF 的抗肿瘤药物疗效不一可能与 VEGF 在 TECs 体外管腔形成的量效和时效的局限性有关。 相似文献
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Growth Characteristics of Myelodysplastic CD34+ Cells 总被引:1,自引:0,他引:1
Ken-Ichi Sawada 《Leukemia & lymphoma》1998,29(1):49-60
Myelodysplastic syndromes (MDS) are a heterogeneous group of disorders of hematopoiesis entailing hyperproliferative and ineffective hematopoiesis associated with morphologic evidence of marrow cell dysplasia resulting in refractory cytopenia(s), and an increased risk of transformation into acute myeloblastic leukemia (AML). The administration of colonystimulating factor(s) (CSFs) to patients with MDS increased blood neutrophil concentrations, in most patients, and it was anticipated to be of benefit to prevent infections. The progression to AML while being treated with CSFs has come under close scrutiny. In vitro studies are expected to produce more pertinent criteria for selection of patients who are likely to benefit, as well as the overall benefits of various therapies. For this purpose, in vitro colony assays are an excellent approach for investigation of the biologic characteristics of MDS progenitor cells. The stem cell phenotype CD34 is the one of the best markers of progenitor cells, and can be used for the purification of these cells to unify levels of maturation; a direct comparison of proliferative and differentiative capacity of MDS progenitor cells with normal CD34+ cells can thus be made. The properties of MDS CD34+ cells are described here in association with proliferation and differentiation, with special emphasis on the role of stem cell factor (a ligand for c-kit) in leukemic type growth of MDS CD34+ cells. 相似文献
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肝细胞生长因子(hepatocyte growth factor,HGF)与血管内皮生长因子(vascular endothelialgrowth factor,VEGF)在肿瘤细胞生长、浸润、转移过程中起重要的调节作用。近些年来,对这些生长因子及其受体的研究,无论是在基础方面,还是在临床病理学方面都取得了很大进展,为抗肿瘤治疗开辟了广阔的前景。对HGF与VEGF的特征及其生物学特性,以及目前研究的重要进展做一综述。 相似文献
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目的 探讨血管内皮生长因子对人胃癌细胞生物学表型的影响。方法 将 VEGF16 5正、反义 RNA表达载体导入人胃癌细胞 ,并观察其细胞周期、增殖、裸鼠致瘤生长等生物学指标。结果 与 VEGF正义转染细胞相比 ,在反义转染细胞的细胞周期中 G1期细胞数增加了 1 7.3% ,而S期细胞减少了 43.6 % ;正义转染细胞的克隆形成率明显高于反义转染细胞 ;正义转染细胞组的肿瘤生长速度及瘤体积明显高于其他组。结论 VEGF可以加强肿瘤组织血管生成 ;VEGF反义RNA可以防治肿瘤生长 ;VEGF可能与肿瘤细胞增殖能力有关. 相似文献
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Effect of Replacement of Wharton Acellular Jelly With FBS on the Expression of Megakaryocyte Linear Markers in Hematopoietic Stem Cells CD34+ 下载免费PDF全文
zahra Jalili Behnam Emamgolizadeh Hossein Abbaszadeh Shahla JaliliMehdi Derakhshani Mehdi YousefiMehdi TalebiKarim Shams Asenjan Ali Akabr Movassaghpour 《Asian Pacific journal of cancer prevention》2022,23(10):3281-3286
Objective: Animal environments for the growth of stem cells cause the transmission of some diseases and immune problems for the recipient. Accordingly, replacing these environments with healthy environments, at least with human resources, is essential. One of the media that can be used as an alternative to animal serums is Wharton acellular jelly (AWJ). Therefore, in this study, we intend to replace FBS with Wharton jelly and investigate its effect on the expression of megakaryocyte-related genes and markers in stem cells. Materials and Methods: In this study, cord blood-derived CD34 positive HSCs were cultured and expanded in the presence of cytokines including SCF, TPO, and FLT3-L. Then, the culture of expanded CD34 positive HSCs was performed in two groups: 1) IMDM culture medium containing 10% FBS and 100 ng / ml thrombopoietin cytokine 2) IMDM culture medium containing 10% AWJ, 100 ng / ml thrombopoietin cytokine. Finally, CD41 expressing cells were analyzed with the flow cytometry method. The genes related to megakaryocyte lineage including FLI1 and GATA2 were also evaluated using the RT-PCR technique. Results: The expression of CD41, a specific marker of megakaryocyte lineage in culture medium containing Wharton acellular jelly was increased compared to the FBS group. Additionally, the expression of GATA2 and FLI1 genes was significantly increased related to the control group. Conclusion: This study provided evidence of differentiation of CD34 positive hematopoietic stem cells from umbilical cord blood to megakaryocytes in a culture medium containing AWJ. 相似文献
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血管内皮生长因子在非小细胞肺癌中表达及意义 总被引:2,自引:0,他引:2
[目的]研究血管内皮生长因子(VEGF)在非小细胞肺癌(NSCLC)中的表达及意义.[方法]应用SABC免疫组化方法检测60例NSCLC中VEGF表达.[结果]NSCLC中VEGF阳性率为61.67%,明显高于癌旁正常组织(8.00%),P<0.01.NSCLC中VEGF表达与临床分期及淋巴结转移显著相关.VEGF表达阴性组1、3、4年生存率分别为86.74%、64.05%、64.05%,而阳性组则分别为85.4%、43.64%、19.05%,经Log-Rank检验,差异有显著性(P<0.05).[结论]VEGF在非小细胞肺癌血管形成及发展中起重要作用,并有助于预测肺癌患者的预后. 相似文献