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《低氧誘導(dǎo)因子過(guò)表達(dá)對(duì)人外周血內(nèi)皮祖細(xì)胞分化影響的體外研究》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
1、低氧誘導(dǎo)因子過(guò)表達(dá)對(duì)人外周血內(nèi)皮祖細(xì)胞分化影響的體外研究作者:姜萌,王長(zhǎng)謙,王彬堯,何奔,邵琴,黃定九【摘要】為了研究低氧誘導(dǎo)因子(hypoxiainduciblefactor-1alpha,HIF-1α)在體外對(duì)人外周血內(nèi)皮祖細(xì)胞(endothelialprogenitorcells,EPC)向血管內(nèi)皮細(xì)胞(endothelialcells,EC)分化的影響,用密度梯度離心法分離人外周血EPC,電穿孔技術(shù)轉(zhuǎn)染HIF-1α質(zhì)粒至EPC,計(jì)算轉(zhuǎn)染效率,RT-PCR方法測(cè)定HIF-1α、HIF-1β及HIF-1α下游靶基因血
2、管內(nèi)皮生長(zhǎng)因子(vascularendothelialgroRNA在質(zhì)粒轉(zhuǎn)染前后含量變化,免疫細(xì)胞化學(xué)方法檢測(cè)在常氧下HIF-1α蛋白在HIF-1α質(zhì)粒轉(zhuǎn)染前后不同時(shí)點(diǎn)蛋白表達(dá)情況,細(xì)胞膜表面抗原決定簇流式細(xì)胞術(shù)測(cè)定FITC-CD31+EPCs/EC在未轉(zhuǎn)染組、pEGFP空質(zhì)粒或HIF-1α質(zhì)粒轉(zhuǎn)染組轉(zhuǎn)染3-10天后的組間差異,光鏡下觀察轉(zhuǎn)染前后細(xì)胞形態(tài)及分化程度。結(jié)果表明:EPC獲得后經(jīng)電穿孔轉(zhuǎn)染,質(zhì)粒轉(zhuǎn)染效率約20%;RT-PCR示HIF-1αmRNA在常氧中有表達(dá),并在HIF-1α過(guò)表達(dá)組含量增加(P<0.0
3、5);其下游靶基因VEGF在HIF-1α過(guò)表達(dá)組表達(dá)上調(diào)(P<0.05);HIF-1β表達(dá)在各組中無(wú)明顯差異(P>0.05)。免疫組織化學(xué)顯示常氧下HIF-1α蛋白無(wú)表達(dá),轉(zhuǎn)染HIF-1α質(zhì)粒12小時(shí)后HIF-1α蛋白表達(dá)陽(yáng)性,轉(zhuǎn)染24小時(shí)后蛋白表達(dá)陰性。流式細(xì)胞儀檢測(cè)顯示電穿孔轉(zhuǎn)染HIF-1α質(zhì)粒使CD31+細(xì)胞的百分比增加(P<0.05)。細(xì)胞形態(tài)學(xué)觀察顯示:未轉(zhuǎn)染及pEGFP空質(zhì)粒轉(zhuǎn)染組細(xì)胞在培養(yǎng)6天后呈集落樣散在分布,培養(yǎng)14天后貼壁細(xì)胞部分呈梭樣;穿孔轉(zhuǎn)染的HIF-1α質(zhì)粒組細(xì)胞于培養(yǎng)6天后集
4、落周邊分化出梭樣貼壁細(xì)胞,培養(yǎng)14天后呈梭樣,或鋪路石樣牢固貼壁。結(jié)論:HIF-1α質(zhì)粒能有效地用于基因干擾治療,有助于EPC向EC分化,為體內(nèi)研究奠定了基礎(chǔ),也為進(jìn)一步體內(nèi)誘導(dǎo)血管新生、治療缺血性心臟病提供了更廣闊的治療選擇?!娟P(guān)鍵詞】低氧誘導(dǎo)因子-1α OverexpressionofHypoxiaInducibleFactor-1alpha(HIF-1α)PromotestheDifferentiationofEndothelialProgenitorCellExVivo AbstractToinvestiga
5、tetheinfluenceofHIF-1αoverexpressiononthedifferentiationofendothelialprogenitorcells(EPCs)exvivo,EPCshumanperipheralbloodbydensitygradientcentrifugation,overexpressedHIF-1αRNAleveleasuredmunohistochemistryinatimecourse.CD31+cellseasuredetry.Cellmorphologyarkedlyi
6、nducedbyHIF-1αvector(P<0.05).HIF1βhaditssamelevelasitbeforeinterference(P>0.05).HIF-1αprotEInentsrevealedthatCD31+EPCs/ECcouldbegeneratedmoreefficientlyfromoverexpressedHIF-1αthanthatfrompEGFPtransfectedgroup(P>0.05).EPCmorphologyicroscopy.HIF-1α-transfe
7、ctedcellsundernormoxiasproutedmorerapidlyfromtheEPCcoloniesthantheuntransfectedcellsorcellstransfectedaintainedtheoriginalcolonyformation.HIF-1αtransfectedcellstookonanarray-likearrangementratherthanrandomdispersal,suggestingthattheyictreatemtninvivo. KeyershamB
8、ioscience公司;60mm細(xì)胞培養(yǎng)皿(Falcon公司產(chǎn)品);M199培養(yǎng)基(Gibco公司產(chǎn)品);VEGF生長(zhǎng)因子終濃度10ng/ml、bFGF生長(zhǎng)因子終濃度2ng/ml(CytoLab/PeprotechAsia產(chǎn)品),0.22μm微孔濾膜抽濾后,-20℃保存?zhèn)溆茫?0%胎牛血清(鼎國(guó)生物公司產(chǎn)品);人外周