草分支杆菌对人脐血树突状细胞体外扩增的影响

背景：树突状细胞因其强大的抗原提呈能力而在机体抗肿瘤作用的中心地位逐渐受到重视,但如何能有效获得足够数量有功能的树突状细胞成为目前研究的重点,尤其是有关低毒免疫调节剂的报道较少。目的：观察草分支杆菌F.U.36（乌体林斯,Utilins）对人脐血来源树突状细胞体外扩增的影响。方法：应用Ficoll-Hypaque法分离人脐血单个核细胞,分别用乌体林斯,细胞因子（重组人粒细胞-巨噬细胞集落刺激因子＋重组人肿瘤坏死因子α＋重组人白细胞介素4）,细胞因子联合乌体林斯进行干预,并以RPMI-1640培养液诱导培养人脐血单个核细胞作为对照组,诱导培养树突状细胞,并于倒置显微镜下观察其生长情况及形态。培养第9天,采用流式细胞仪检测各组人树突状细胞特异性表型CD1a及MHC-Ⅱ分子HLA-DR的变化,并将细胞涂片行瑞氏-姬姆萨染液染色,油镜下观察摄片。结果与结论：除对照组外,实验各组均得到高表达CD1a及HLA-DR的典型树突状细胞。乌体林斯组CD1a及HLA-DR阳性细胞比例亦明显高于对照组而低于细胞因子组（P〈0.05）,联合组HLA-DR阳性细胞比例高于细胞因子组（P〈0.05）。结果提示,草分支杆菌F.U.36（乌体林斯）不仅能促进脐血树突状细胞体外扩增,还能协同细胞因子促进树突状细胞成熟。     

人脐静脉内皮细胞抑制单核细胞源树突状细胞的产生

本研究旨在探讨人脐静脉内皮细胞(HUVEC)对树突状细胞(DC)发育的影响.首先,利用酶消化法从人脐带分离获得HUVEC,从细胞形态、表型和功能进行鉴定;进一步将获得的HUVEC结合细胞因子配伍与CD14+单核细胞共培养,检测HUVEC对CD14+细胞向DC分化的影响;流式细胞术检测分化细胞的表型,混合淋巴细胞反应检测分化细胞的免疫学功能;采用中和抗体实验和Western blot检测对细胞增殖和分化起重要调控作用的IL-6和VEGF以及ERK和p38MAPK通路的改变.结果表明,从脐静脉分离获得的细胞呈长梭形形态,细胞表型为vWF+ CD31+ CD73+CD45-HLA-DR-CD86-CD34low,Dil-Ac-LDL吸收实验为阳性,且细胞可诱导形成血管样结构,提示分离获得了HUVEC;进一步将HUVEC与CD14+单核细胞共培养,流式细胞仪检测结果表明HUVEC可抑制CD14+单核细胞向DC的分化,诱导获得的细胞CD1a表达显著降低,混合淋巴细胞检测结果显示,与HUVEC共培养获得的DC刺激T细胞增殖作用显著降低,且具有剂量依赖性;中和抗体实验分析其可能的作用机制表明,IL-6和VEGF在CD14+单核细胞向DC分化过程中具有重要调控作用,Western blot检测结果说明其主要通过ERK和p38通路完成调控作用.结论:人内皮细胞参与DC的发育,且起到抑制作用.

Abstract：

This study was aimed to investigate the effect of human umbilical vein endothelial cells(HUVEC)on dendritic cell(DC)development.First,HUVEC were isolated from human umbilical cord by collagenase digestion,and then the morphology,immunophenotypes and functions were identified.Furthermore,the HUVEC were cocultured with CD14+ monocytes under the cytokine condition for detecting the influence of HUVEC on differentiation of CD14+ cells to DC.The phenotype of dendritic cells derived from CD14+ cells was analyzed by flow cytometry,the immunoregulatory function of DC was tested by mixed lymphocyte reaction(MLR).The change of IL-6 and VEGF as well as EPK and p38 signal pathway were analyzed by neutral antibody experiment and Western blot.The results showed that HUVEC isolated from human umbilical cord were characterized by spindle-shaped morphology,homogenous immunophenotypes (vWF+ CD31+ CD73+ CD45-HLA-DR-CD86-CD34(low),Dil-Ac-LDL incorporation ability and forming capillary-like structures.Following stimulation with granulocyte-macrophage colony-stimulating factor(GM-CSF)plus interleukin-4 (IL-4),HUVEC cocultures could inhibit the initial differentiation of CD14+ monocyte to DC.Interestingly,IL-6 and VEGF enhanced the suppression effect of HUVEC on generation of DC via activation of the ERK or p38 mitogen activated protein kinase pathway.It is concluded that HUVEC are involved in DC development and can suppress the differentiation of monocyte to DC.     

THE EFFECT OF STEM CELL FACTOR, INTERLEUKIN-6 AND ERYTHROPOIETIN ON EXPANSION OF CD34~ CELLS FROM HUMAN UMBILICAL CORD BLOOD

CD34 cells from human umbilical cord blood were purified by Dynal beads M-450 CD34 immunoselection system and cultured in the presence of various cytokines alone or in combination, including stem cell factor (SCF), interleukin-6 (IL-6) and erythropoietin (EPO). The results revealed that: (D In methylcellulose culture, the plating efficiencies of purified cord blood CD34 cells were much different when stimulated by various cytokines. IL-6 alone had the lowest colo-ny yield, while the combination of SCF, IL-6 and EPO had the highest yield. ② In the suspension culture, IL-6 alone or IL-6 EPO had little expanding effect on cord blood CD34 celis, the other cytokine combinations could expand cord blood CD34 celis at different Ievels. Among them, the combination of SCF, IL-6 and EPO had the maximal expanding effect on cord blood CD34 celis, the number of progenitor celis peaked at day 21, about 29-fold increase and nucleated celis increased approximately 3676-fold at day 28. The expanding effect of the     

Effects of the Cell Cycle Inhibitor Olomoucine on Inflammatory Response and Neuronal Cell Death after Spinal Cord Injury in Rats

Objective:The influence of olomoucine on microglial proliferation with associated inflammatory response after spinal cord injury has been determined.Methods:Microglial proliferation and neuronal apoptosis were observed by immunofluorescence.Level of the proinflammatory cytokine interleukin-1β(IL-1β)expression in the injured cord was determined by Western blot analysis.Results:the cell cycle inhibitor olomoucine,administered at 1 h post injury,significantly suppressed microglial proliferation and produced a remarkable reduction of tissue edema formation.In the olomoucine-treated group,a significant reduction of activated and/or proliferated microglial induced IL-1β expression was observed 24 h after SCI.Moreover,olomoucine evidently attenuated the number of apoptotic neurons after SCI.Conclusion:Our findings suggest that modulation of microglial proliferation with associated proinflammatory cytokine expression may be a mechanism of cell cycle inhibition-mediated neuroprotections in the CNS trauma.     

Experiment studies of tumor necrosis factor changes in different tissues after stimulating vagus nerve

AIM：To investigate the effect of proinflammatory cytokine and anti-infalammatation cytokine on liver and lung tissues in rats with endotoxemia.METHODS:Male Wistar rats were randomly divided into 4 groups:group treated with stimulating vagus nerve,group receiving lipopolysaccharide (LPS) intravenous injection after transecting vagus nerve,group treated with sham operation and group treated with injecting LPS intravenously alone,and then measured the levels of TNF-α in liver and lung and those of cortisol and Alanine aminotransferase(ALT) in plasma.RESULTS:Compared with group treated with sham operation,LPS-treated groups showed a significant increase in TNF level,which was at most 15 fold higher than that of the former group.There was a significant decrease in TNF level in group treated with stimulating vagus nerve,compared with both group receiving LPS intravenous injection after transecting vagous nerve and group treated only with LPS.In addition,we observed plasma cortisol level in LPS-treated group was much higher than other 3 groups and the plasma ALT level was greatly lower than that of group treated only with LPS.CONCLUSION:Stimulating vagous nerve can significantly decrease the production of proinflammatory cytokine and alleviate inflammation in rats with endotoxemia.     

脊髓损伤大鼠核因子kappa B与细胞凋亡及肢体功能间的相关性分析

Objective To investigate the relationship of nuclear factor kappa B(NF-κB),Bcl-2 and Bax with limb function after acute spinal cord injury in rats. Methods Forty-eight rats were divided at random into a control group and an experimental group with 24 rats in each.The spinal cords of the rats in the experimental group were injured at the T8,9,10 level through moderate compression.Four hours,8 h,and 1,3,7 and 14 days after the injury,4 rats were selected randomly from each group and graded with a BBB score.They were then sacrificed and their spinal cords were collected.Immunohistochemical measurements were used to observe the expression of NF-κB, Bcl-2 and Bax. Results NF-κB,Bcl-2 and Bax were observed in the injured spinal nerve cells of rats in the exper imental group but were absent in the control group.After injury,the expression of these factors increased at first and then decreased.BBB scores for limb function increased gradually.No correlation was found between the changes in NF-κB and Bcl-2,but the expression of NF-κB was positively correlated with that of Bax.There was negative correla tion between NF-kB levels and BBB scores,and between NF-kB levels and the ratio of Bcl-2 to Bax. Conclusion In rats,there is a close negative correlation between NF-kappa B levels,the ratio of Bcl-2/Bax and limb function after acute spinaI cord iujury.     

干细胞因子对内皮细胞增殖、迁移、管状形成能力的影响及对CD133+细胞的趋化效应

目的 探讨干细胞因子(SCF)对脐静脉内皮细胞(HUVEC)增殖、迁移、管状形成能力的影响,以及对CD133+细胞的趋化效应.方法 应用MTT及CCK-8增殖分析法检测HUVEC在不同细胞因子[空白试剂、SCF、血管内皮生长因子(VEGF)、抗人SCF、人IgG]条件下增殖能力的差异性;采用细胞划痕法与Matrigel体外三维成型法分别检测内皮细胞的增殖、迁移和管状形成能力;并应用Transwell技术检测不同细胞因子诱导的CD133+细胞体外趋化效应.结果 MTT及CCK-8增殖分析结果显示SCF无HUVEC增殖刺激活性;SCF可显著提升HUVEC迁移能力;SCF呈剂量依赖性增强HUVEC 管状形成能力,在适宜浓度SCF(100 ng/ml)作用下,HUVEC完整小管形成数量[(30.0 ±3.4)/105HUVEC]显著高于空白试剂组[(5.0±2.6)/105HUVEC,P<0.01];SCF可高效诱导CDl33+细胞体外趋化,SCF组[(118.0±6.5)/104CD133+细胞]Transwell小室跨膜迁移细胞数显著高于空白试剂组[(47.0±4.7)/104CDl33+细胞,P<0.01].结论 SCF可显著增强HUVEC的迁移及管状形成能力,并有效诱导CD133+细胞体外趋化,提示SCF/c-kit信号转导在内皮细胞及其祖细胞的血管新生与血管发生过程中可能发挥重要作用.

Abstract：

Objective To explore the effects of stem cell factor (SCF) on proliferation, transmigration, capillary tube formation of human umbilical vein endothelial cells (HUVEC) and on the chemotaxis of CD133+ cells. Methods In the presence of blank control, SCF, vascular endothelial growth factor ( VEGF) , anti-human SCF (anti-SCF) or human IgG, the difference in proliferation capacity of HUVEC was analyzed by MTT and CCK-8 methods, and wound scratch assay and three-diamensional in vitro Matrigel assay were used for transmigration and capillary tube formation of HUVEC, respectively. In addition, the chemotaxis of CD133 + cells sorted from human umbilical cord blood by flow cytometry was investigated by Transwell migration assay. Results SCF didn't improve the proliferative capacity of HUVEC, but significantly enhanced the transmigration capacity, and increased capillary tube formation in a dose-dependent manner.The number of intact tubules [(30.0 ±3.4)/105 HUVEC] formed by HUVECs in the presence of the optimal concentration of SCF (100 ng/ml) was remarkably higher than that in blank control group [(5.0 ±2.6)/105HUVEC,P <0.01]. SCF also significantly induced a chemotactic response of CD 133+ cells, the transmembrane migration cell number into Transwell lower chamber was significantly higher in SCF group [(118.0 ±6.5)/104 CD133+ cells] than in blank control group [(47. 0 ±4. 7)/104 CD133 + cells,P <0.01]. Conclusions SCF significantly promotes the transmigration and capillary tube formation of HUVEC, and induces a chemotactic response of CD133 + cells. SCF/c-kit signaling possibly plays a critical role in regulating angiogenesis of vascular endothelial cells and vasculogenesis of endothelial progenitor cells.     

Potential role of the compound Eucommia bone tonic granules in patients with osteoarthritis and osteonecrosis: A retrospective study

BACKGROUND Osteoarthritis is a major source of pain,disability,and socioeconomic cost worldwide.Osteonecrosis is a disabling disorder that frequently occurs in the younger population aged from 20-50 years.The compound Eucommia bone tonic granules,a traditional Chinese medicine,can alleviate the damage of osteoarthritis and osteonecrosis.AIM To investigate the potential role of the compound Eucommia bone tonic granules(Eucommia)in the treatment of patients with osteoarthritis and osteonecrosis.METHODS One-hundred forty osteoarthritis and osteonecrosis cases admitted to our hospital from January 2013 to December 2017 were selected.Patients were divided into two groups:Eucommia-meloxicam group and meloxicam group.Clinical efficacy and the Western Ontario and McMaster Universities Arthritis Index(WOMAC)score were evaluated according to the evaluation criteria of orthopedic diseases.The levels of bone-GLA protein,interleukin-17,recombinant human S100 calcium binding protein A12,sphingosine 1-phosphate,cystatin C,creatinine,and hemoglobin in peripheral blood were determined.RESULTS The total effective rate in the two osteoarthritis groups was not different,but the total effective rate in the two osteonecrosis groups was significantly different.The overall efficacy of Eucommia-meloxicam group was superior to that of the meloxicam group.WOMAC showed that pain,stiffness,and dysfunction in the two groups of osteoarthritis and osteonecrosis before and after treatment were significantly different.The concentration of recombinant human S100 calcium binding protein A12,sphingosine 1-phosphate,cystatin C,creatinine,and hemoglobin before and after treatment in the Eucommia-meloxicam group and meloxicam group of osteoarthritis and osteonecrosis were significantly different,and the two treatment groups were significantly different from each other for osteoarthritis.CONCLUSION Our findings indicate that Eucommia can effectively enhance the curative effect of meloxicam,and the combination of Eucommia and meloxicam is superior to meloxicam alone.     

脾脏调节性树突细胞对烫伤小鼠炎症反应及预后的影响

Objective To observe the effect of regulatory dendritic cells (DCregs) on burn injury induced proinflammatory cytokine production and mortality rate after a single intraperitoneal injection of CD11clowCD45RBhigh DCs to injured mice. Methods DCregs were isolated and purified from spleen of 100 normal BALB/c mice to procure CD11clowCD45RBhigh DCs by MiniMACS. Mice were subjected to a 15% total body surface area (TBSA) burn injury on the back. Twenty mice were used, and splenic DCregs (1×105/ml, 5×105/ml, 10×105/ml) were given to them to investigate the protective effect of DCregs against lethality at postburn hours (PBH) 48, and to decide the optimal dosage of intervention. Another group of 70 mice were used, and they were divided into normal control group (n=7), sham burn injury group (n= 21), burn injury group (n = 21), and DCregs treatment group (n = 21). The mice in burn injury group received intraperitoncally 1 ml of Ringer solution for resuscitation. 10×105/ml of CD11clowCD45RBhigh DCs were added to lactated Ringer solution for intraperitoneal injection in DCregs treatment group. Seven animals of each group were sacrificed at PBH 12, 24 and 48, respectively, and blood samples were collected aseptically for measurement of cytokine levels in plasma and phenotype expressions on DCs by flow cytometry. Results Treatment with 10×105/ml DCregs showed a significant decrease in mortality rate compared with burn injured mice and burn injured mice given lower doses of DCregs (1×105/ml, 5×105/ml DCregs, 0% vs. 80%, 80% and 60%, all P＜0. 01). A single intraperitoneal injection of 10×105/ml DCregs to burn injury mice showed a significant decrease in plasma interleukin-6 (IL-6, ng/L: 98. 76 ±10.02, 57. 83 ±6. 83, 13.29 ±1.07) compared with burn injury mice (156.32 ± 12. 85, 84. 50 ±9. 29,23.04±2. 53) at PBH 12, 24 and 48 (all P＜0. 01). Similarly, in 10×105/ml DCregs treatment group,plasma macrophage chemoattractant protein-1 (MCP-1) levels (ng/L: 102.79 ±9. 88, 42. 56 ±5. 90,12. 96±1. 34) were markedly lower than those in burn injury group (168. 23±23. 85, 83. 39±8. 41, 42. 92±4. 96) at PBH 12, 24 and 48 (all P＜0. 01). A single intraperitoneal injection of 10×105/ml DCregs to burn injury mice showed significant reduction in plasma tumor necrosis factor-α (TNF-α) levels (ng/L: 16. 84±1.92, 16. 62±1.28, 10. 26±1. 10) compared with burn injury mice (24. 16±4. 93, 24.25±4. 01, 17. 91±1.82) at PBH 12, 24 and 48 (all P＜0. 01). Conclusion DCregs may effectively improve the outcome of mice with severe burn injury through a single intraperitoneal injection of DCregs accompanied by lowering excessive inflammatory reaction.     

咳嗽训练促进颈脊髓损伤伴不全瘫患者排痰

【 abstract 】 objective To explore the effects of cough training on intercostals muscles strength and sputum excretion ability in acute cervical spinal cord injury patients with incomplete paralysis. Methods 127 acute cervical spinal cord injury with incomplete paralysis cases treated in changzheng hospital from January 2012 to December 2015 were admitted into study. They had been divided into experimental group and control group randomly by the method of throwing a coin.Experimental group started cough training from 1 d postoperative and the control group only treated by routine sputum nursing measures.The effect of sputum excretion ability, intercostals muscles strength and the rate of sputum suction,lung infection and atelectasis had been compared 8 days after surgery.Results The sputum excretion ability and intercostals muscles strength of the experimental group were significantly better than the control group 8 days after surgery.The rate of sputum suction,lung infection and atelectasis in experimental group was significantly lower than the control group.There were no complications of early cervical fixation turning up in both groups.Conclusion The cough training can strengthen intercostals muscles of CSCI patients with incomplete paralysis, promote their sputum excretion ability .Futhermore ,It can reduce the rate of sputum suction and the incidence of respiratory complications such as lung infection, atelectasis.     

草分支杆菌F.U.36混悬注射液对人脐血树突状细胞体外扩增的影响

为了探讨草分支杆菌F．U．36混悬注射液（鸟体林斯,U）对人脐血来源树突状细胞（DC）体外扩增有无影响,应用Ficou-Hypaque法分离人脐血单个核细胞（CB-MNC）,对照组以RPMI1640培养液诱导培养CB．MNC。实验组分为Utilin“s”组（仅加入Utilin“s”PRMI1640）,GTI组（GM-CSF,TNF-α,IL-4）和GTIU组（GM-CSF。TNF-α IL-4和Utilin“s”）。在光学显微镜下观察DC生长情况。至培养第10天,应用流式细胞仪检测各组细胞免疫表型,并将细胞涂片行瑞氏-姬姆萨染液染色,在油镜下观察摄片。结果显示：3个实验组均得到一定数量的典型DC;Utilin“s”组CDIa^＋、HLA-DR^＋细胞比例高于对照组;GTIU组HLA-DR’细胞比例升高最明显,高于GTI组。结论：草分支杆菌F．U．36混悬注射液不仅能促进脐血DC体外扩增。还能协同rhGM—CSF、rhTNF-α、rhIL4促进DC成熟。     

肿瘤坏死因子α和白细胞介素4对脐血CD34+造血干细胞来源的树突状细胞体外培养体系的影响

背景：造血干细胞是构筑免疫系统的最早的细胞，能分化为多种细胞，其中具有包括免疫应答调控树突状细胞。树突状细胞的诱导培养因前体细胞来源不同，所采用的细胞因子，及最佳的细胞因子配伍、应用顺序、实验室培养条件亦不相同，树突状细胞的发育、各种表型的表达及成熟度也不尽相同。目的：观察肿瘤坏死因子α和白细胞介素4对脐血CD34＋造血干细胞来源的树突状细胞诱导培养体系的影响，探寻该培养体系优化方法。设计、时间及地点：观察性实验，于2005—03／11在南京医科大学微生物与免疫学实验室完成。材料：健康新生儿脐血为南京市八一医院产妇同意捐赠。CD34单克隆抗体-磁珠分离系统为德国MiltenyiBiotec公司产品；重组人粒细胞巨噬细胞集落刺激因子（GM—CSF）、重组人白细胞介素4和重组人肿瘤坏死因子α为美国PeproTech公司产品。方法：淋巴细胞分离液分离获得脐血单个核细胞，免疫磁珠阳性分选CD34＋造血干细胞，并用流式细胞术鉴定CD34＋造血干细胞纯度；比较GT（GM-CSF＋肿瘤坏死因子α）方案和GTI（GM-CSF＋肿瘤坏死因子α＋白细胞介素4）方案及GTI方案中肿瘤坏死因子α和白细胞介素4不同时段加入对诱导培养产生的树突状细胞成熟的影响；通过激光共聚焦显微镜观察细胞形态，流式细胞仪分析细胞表型及3H-TdR检测树突状细胞激发异体T细胞增殖能力。结果：免疫磁珠阳性分选CD34＋造血干细胞纯度可达90％以上。将CD34＋造血干细胞按GT方案和GTI方案进行培养，均可诱导产生树突状细胞，CD34的阳性表达率逐渐下降，HLA-DR的表达下降（P〈0．05），树突状细胞的相关分化抗原CD80，CD86，CD83和CDla的表达均相应增加，培养13～15d的细胞各表型表达较7-9d，10～12d充分。但经GT方案诱导的树突状细胞CD14表达较高，CD80，CD86，CD83，CD1α表达不如经GTI方案诱导的高；而GTI方案中，以肿瘤坏死因子Q0h、白细胞介素448h加入诱导培养的树突状细胞各表型表达相对较佳，其细胞表达CD80，CD86均较其他组高，尤以CD86表达为著，并具有激发异体T细胞增殖能力。结论：CD34＋造血干细胞经过合适的培养体系能够诱导分化为功能性树突状细胞，以GM-CSF与肿瘤坏死因子α0h加入、白细胞介素448h加入的GM-CSF＋肿瘤坏死因子α＋白细胞介素4方案更为可取。     

细胞因子体外诱导脐血CD34+细胞增殖并向巨核细胞/血小板分化的研究

本研究旨在观察几种不同细胞因子组合通过体外培养以诱导造血干/祖细胞增殖和向巨核细胞/血小板分化.应用无血清培养基(StemSpan SFEM)体外扩增脐血CD34+细胞并向巨核细胞/血小板定向分化,将不同细胞因子组合分为3个阶段培养,并比较其培养效果.结果表明,在第一阶段的第14天时,SCF + TPO + FL + ...     

人脐血清代替胎牛血清体外培养脐血树突状细胞

目的　探讨人脐血清取代胎牛血清对脐血来源的树突状细胞体外诱导的影响。方法　无菌采集脐血 ,密度梯度离心法获取界面细胞 ,采用Mini MACS分离技术 ,分离CD34+ 造血干细胞 ,分成 3组 :脐血清组 (加入含 10 %UCS的RPMI 16 4 0培养液及细胞因子 ) ,胎牛血清组 (加入含 10 %FCS的RPMI 16 4 0培养液及细胞因子 ) ,对照组 (含10 %FCS但不含细胞因子 )。细胞因子为IL 4、GM CSF和TNF α ,第 8天收集部分细胞做细胞表型分析、形态学观察。结果　脐血清培养的DC(UCS DC)表面CD80、CD5 4和HLA DR的表达率与胎牛血清培养DC(FCS DC)比较无明显差异 ,UCS DC、FCS DC表达率与对照组比较均明显增高。结论　脐血清代替胎牛血清体外培养脐血来源的DC前体细胞 ,可以诱导出成熟DC ,为临床应用提供了一种新的选择。     

脐血树突状细胞对同源CIK细胞生物学活性及抗白血病作用影响的研究

本研究旨在探索脐血树突状细胞（DC）对同源细胞因子诱导的杀伤（CIK）细胞体外增殖、免疫表型、分泌细胞因子水平及其对白血病细胞细胞毒作用的影响。采集脐血单个核细胞诱导DC和CIK细胞。将DC和CIK细胞按1：5的比例混合培养,以脐血CIK细胞或外周血DC—CIK细胞为对照。用流式细胞术分析细胞表型,台盼蓝活细胞计数计算细胞扩增倍数,MTT法检测效应细胞杀伤白血病细胞的活性,ELISA法测定分泌干扰素-γ（IFN—γ）、肿瘤坏死因子-α（TNF-α）、白介素-12（IL—12）的水平。结果表明,脐血DC—CIK细胞增殖能力显著高于脐血CIK细胞和外周血DC-CIK细胞（P〈0．05、P〈0．05）;脐血DC、CIK细胞共培养后,CD3^＋CD8^＋、CD3^＋CD56^＋细胞比例较相同奈件下CIK细胞明显增多（P〈0．05）;混合培养3天,脐血DC—CIK细胞上清液中IL-12、IFN-γ 、TNF—α含量均比单纯培养CIK细胞分泌含量高（P〈0．01、P〈0．05、P〈0．05）;在2．5：1—20：1的效靶比范围内,脐血DC—CIK细胞对各亚型急性白血病细胞的杀伤率明显高于CIK细胞（p〈0．05）,但对各亚型白血病细胞杀伤活性无显著性差异,与外周血DC—CIK细胞对白血病杀伤效应相类同。结论：脐血DC可增强同源CIK细胞的增殖活性和抗白血病效应。脐血DC。CIK细胞增殖能力比外周血DC—CIK细胞强,但两者在细胞毒方面无显著性差异。因脐血较易获得,且输注不易引起严重的排斥反应,因而DC—CIK细胞在免疫治疗方面具有更广泛的临床应用前景。     

培养条件对体外诱导造血干/祖细胞向血小板定向增殖与分化的影响

目的观察3种不同培养基以及细胞接种密度对体外诱导造血干/祖细胞向血小板方向增殖和分化的影响。方法用添加干细胞因子(SCF)和促血小板生成素(TPO)等细胞因子的无血清培养基(StemSpan(SFEM和X-VIVO10)或IMDM/10%FBS来扩增脐血CD34+细胞向血小板定向分化,比较不同培养基的培养效果;CD34+细胞接种浓度为5×103/ml、104/ml和105/ml,比较不同接种浓度对扩增效果的影响。结果培养d 14、d 24和d 29时,StemSpan(SFEM培养基体系中细胞分别扩增了(11 000±577.35)、(196 666.67±14 529.66)和(176 666.67±8 819.17)倍,显著高于X-VIVO10和IMDM/10%FBS组,其中在d 24和d 29时,巨核系细胞所占比例分别是(54.57±2.32)%和(69.4±2.02)%,显著高于X-VIVO10和IMDM/10%FBS组。培养14 d后初始接种浓度为104/ml的CD34+细胞在StemSpan(SFEM培养基体系中扩增(11 000±577.35)倍,显著高于初始接种浓度为5×103/ml和105/ml组。结论和X-VIVO10和IMDM/10%FBS相比,StemSpan(SPEM培养基最有利于脐血CD34+细胞体外向血小板定向扩增和分化;104/ml的CD34+细胞接种密度最有利于细胞扩增和分化。     

不同细胞因子组合对人脐血单个核细胞体外扩增及CD49d和CXCR4表达的影响

为了探讨不同的细胞因子组合对脐血单个核细胞体外的扩增作用及扩增后CD49d和CXCR4的变化，将新鲜脐血标本分离的单个核细胞接种于含有不同细胞因子组合的无血清无基质培养体系中培养7天，在0天，7天检测有核细胞数，CD34^＋细胞数及CD34^＋CXCR4^＋，CD34^＋CD49d^＋的细胞数和集落形成单位（CFU）数．根据不同细胞因子组合实验分组为：对照组；SF组（SCF＋FL）；SFT组（SCF＋FL＋TPO）和SFT6组（SCF＋FL＋TP0＋IL-6）。结果表明，和对照组相比，SF组合仅能低水平支持脐血造血细胞扩增，加入TPO后即SCF／FL／TPO组合能有效的扩增脐血细胞，但SFT和SFT6两组之间差异却无明显发生（P〉0．05）；SF，SFT和SFT63组的细胞因子组合均可提高脐血CD34^＋细胞CD49d，CXCR4的表达，但3组之间差异无显著性（P〉0．05）。结论：SF组合可协同扩增人造血细胞，但协同作用较弱；TPO在脐血造血干／祖细胞体外扩增中起重要调节作用，而IL-6作用不显著；SCF／FL／TPO 3种因子组合不仅可促进脐血造血祖细胞的扩增，而且可上调脐血造血细胞CD49d，CXCR4表达。     

腺相关病毒载体介导的人凝血因子Ⅸ基因在CD34+造血干/祖细胞中的表达

目的 研究2型重组腺相关病毒（rAAV-2）介导的人凝血因子Ⅸ（hFⅨ）基因在脐血CD34^＋细胞及其子代细胞巾的表达。方法 采用rAAV-2／hFⅨ转导经预刺激的人脐血CD34^＋细胞，分别向粒单系、巨核系和红系分化培养21d，从转录水平、蛋白质水平和其功能活性检测hFⅨ的表达，同时检测子代细胞的活力、增殖倍数、各系标志分化抗原的表达及集落产率来评估rAAV-2对其增殖分化能力的影响。结果 经测序证实转导组子代细胞的RNA可扩增出hFⅨ cDNA片段，上清液中可检测到hFⅨ抗原的表达，每24h分泌量达14.10ng／10^6细胞．转导组和未转导组细胞培养21d后其活力、增殖倍数、标志性分化抗原的阳性率及集落产率差异均无统计学意义（P值均〉0．05）。结论 rAAV-2／hFⅨ能有效地转导人脐血CD34^＋细胞并在其子代细胞中表达具有凝血活性的hFⅨ，且对其体外培养21d的细胞增殖分化能力无明显影响.     

人胚胎AGM区基质细胞在体外培养中对脐血CD34+细胞的支持作用

目的探讨人主动脉-性腺-中肾(AGM)区基质细胞对脐血CD34+细胞的造血支持作用.方法采用免疫磁珠法分离人脐血CD34+细胞,接种于底层已制备好的人AGM区基质细胞S1～S5饲养层的24孔板中,同时设无饲养层组及取自同期胚胎的躯干成纤维(hFT)细胞为对照,体外培养28 d,每7 d收获细胞并检测总数,流式细胞术检测CD34+、CD34+CD38细胞含量,并行造血细胞集落培养.结果在未加外源性造血生长因子的条件下,5株人AGM区基质细胞hAGMS1～S5对造血细胞总数、CD34+及CD34+CD38细胞、造血细胞集落均有不同程度的扩增及维持作用,与无饲养层组、hFT细胞组比较差异有统计学意义(P＜0.05).细胞总数在21 d达到峰值[扩增(25.13±4.83)倍],CD34+、CD34+CD38-细胞在扩增14 d达到峰值[(2.68±0.51)倍、(2.38±0.45)倍],高增殖潜能集落形成单位(HPP-CFU)亦在14 d达到峰值[(2.62±0.85)倍].hAGMS1～S5的造血支持作用组间比较差异亦有统计学意义(P＜0.05),其中hAGMS3、S4优于S1、S2及S5.结论人AGM区基质细胞对脐血CD34+细胞具有维持及扩增作用,特别是hAGMS3、S4两株细胞具有更好的维持作用,为胚胎早期造血发生机制和诱导胚胎干细胞造血分化研究提供了重要的模式细胞和基础资料.