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基质细胞衍生因子【摘要】为了研究基质细胞衍生因子-1和血小板第4因子(PF4)对扩增后脐血CD34+细胞归巢相关功能的影响,将纯化的脐血CD34+细胞接种入无血清培养液中,加入不同组合的细胞因子FST、FST+SDF-1、FST+PF4或FST+SDF-1+PF4,分别于培养第7、10、14天检测CD34+细胞扩增倍数、集落形成能力、细胞的黏附分子表达、总黏附性、趋化功能。结果表明:①加入SDF-1的实验组CD34+细胞及造血祖细胞集落扩增倍数高于对照组;②加入SDF-1明显上调扩增的CD34+细胞CD49e的表达,加入PF4明显上调扩增的CD34+细胞CD49e、CD54的表达,在扩增体系中加入SDF-1或PF4均能够明显提高扩增的CD34+细胞的总黏附性;③在扩增体系中加入SDF-1能够明显提高扩增的CD34+细胞的自发迁移率,但导致CXCR-4的表达和SDF-1诱导迁移率降低;而PF4能够明显提高扩增的CD34+细胞的CXCR-4的表达和SDF-1诱导迁移率;在扩增体系中同时加入SDF-1和PF4能够明显提高扩增的CD34+细胞自发迁移率和SDF-1诱导迁移率。结论:体外扩增体系中加入SDF-1和PF4能够上调部分归巢相关黏附分子的表达,保持扩增的CD34+细胞的黏附和迁移能力,有利于降低体外扩增对造血干/祖细胞归巢相关功能的不利影响,维持扩增的HSPC的归巢潜能。【关键词】CD34+细胞EffectsofStromalCell-derivedFactor1andPlateletFactor4ontheAdhesionCharacteristicsandChemotacticFunctionofExVivoExpandedUmbilicalCordBloodCD34+CellsAbstractToinvestigatetheeffectsofstromalcell-derivedfactor1(SDF-1)andplateletfactor4(PF4)onthehoming-relatedfunctionofexpandedexvivoumbilicalcordbloodCD34+cells,purifiedcordbloodCD34+cellswereculturedinserum-freemediumcontainingaHGFcombinationofFL+SCF+TPO(FST)witheither100ng/mlSDF-1alone,100ng/mlPF4alone,orbothofthese2cytokines.TheexpansionrateofCD34+cells,colonyformation,homing-relatedfunctionsincludingexpressionofhoming-relatedadhesionmoleculesofexpandedCD34+cell,adhesionactivityandchemotacticfunctionofthere-selectedexpandedCD34+cellswereevaluatedatdifferenttimepoints.TheresultsshowedthatexpansionrateofCD34+cellsandexpansionmultipleofCFUinSDF-1groupswerehigherthanthoseincontrol.TheexpressionofCD49eontheexpandedCD34+cellswasremarkableup-regulated,incontrast,expressionofCXCR-4ontheexpandedCD34+cellswasremarkabledown-regulatedinSDF-1groups.TheexpressionofCD49e,CD54andCXCR-4ontheexpandedCD34+cellswereremarkablyup-regulatedinthePF4groups.InalltheSDF-1group,PF4groupandSDF-1plusPF4group,theabilityofexpandedCD34+cellsadheringtofibronectinlayerwerehigherthanthoseinthecontrolonday10.SpontaneousmigrationrateofexpandedCD34+cellsinSDF-1groupswerehigherthanthoseincontrol,whileSDF-1-inducedmigrationratewerelowerthanthoseincontrolonday10.SD