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1、山西醫(yī)科大學碩士學位論文人臍帶間充質(zhì)干細胞向軟骨細胞誘導分化的實驗研究姓名:祝佳佳申請學位級別:碩士專業(yè):骨科學指導教師:衛(wèi)小春20070504一出疆醫(yī)赴盤芏曼±蘭壁曼塞人臍帶聞充質(zhì)千細胞向軟骨細胞誘導分化的實驗研究摘要目的探討人臍帶問充質(zhì)干細胞在單層培養(yǎng)中向軟骨細胞定向分化的條件,為軟骨組織工程學提供新的種子細胞.方法采用細胞產(chǎn)品國家工程研究中心原代人臍帶問充質(zhì)干細胞,在含10%胎牛血清的低糖DMEM/F-12培養(yǎng)液中培養(yǎng)擴增,流式細胞儀分析臍帶問充質(zhì)干細胞的表面標志。將培養(yǎng)第3代細胞分為4組:A組為對照組,
2、B組為無血清誘導培養(yǎng)基組(含lOng/ml的TGF-口l、丙酮酸鈉lmM、地塞米松10-7M、牛胰島素6.25l,g/mt、轉(zhuǎn)鐵蛋白6.25ag/ml的高糖DMEM培養(yǎng)液);c組為含5%胎牛血清的誘導培養(yǎng)基組;D組為含10%胎牛血清的誘導培養(yǎng)基組。倒置顯微鏡下觀察細胞生長狀況,甲苯胺藍染色檢測蛋白多糖的分泌,免疫組化檢測Ⅱ型膠原分泌,原位雜交檢測Ⅱ型膠原mRNA表達,MTT法檢測細胞的增殖情況.結(jié)果臍帶問充質(zhì)干細胞經(jīng)體外培養(yǎng)擴增,貼壁后的細胞形態(tài)均一,呈梭形,并一致表達CD44,而CD34、CD38呈陰性.B、
3、c組細胞在誘導培養(yǎng)9天后甲苯胺藍染色陽性,Ⅱ型膠原免疫組化均為陽性,原位雜交可檢測到Ⅱ型膠原mRNA的表達,而A、D兩組分別為陰性和弱陽性.D組細胞增殖最強,而B組細胞最弱,四組細胞經(jīng)MT'F法檢測后吸光度值(opticaldensityOD)大小順序為D>C>A>B。結(jié)論人臍帶間充質(zhì)干細胞在體外培養(yǎng)擴增后,生長穩(wěn)定,表型均一;10ng/ml的TGF-15l可誘導人臍帶間充質(zhì)干細胞向軟骨細胞方向分化,但在無血清培養(yǎng)基中無法有效的促進細胞的增殖;低濃度的胎牛血清(5%)和10rig/ram的TGF-pl聯(lián)合作用既
4、可促進入臍帶問充質(zhì)干細胞的增殖,又可誘導其向軟骨細胞方向分化,而高濃度胎牛血清僅對細胞的增殖有促進作用..關(guān)鍵詞臍帶,問充質(zhì)干細胞,轉(zhuǎn)化生長因子p1,分化,軟骨細胞ExperimentalStudyofInVitroChondrogenicDifferentiationofHumanumbilicalcordMesenchymaiStemCellsAbstactPurposeThepurposeofthisstudyistoestablishamethodofculturinghumanumbilicalcor
5、dmeseaehymalstemceII(hUCMSC)andinvestigatethefeasibilityofinvitrochondrogenicdifferentiationofhUCMSCinmonolayeralIntreaspotentialseedingcellsincartilagetissueengineering.MethodsTheo堍inalhUCMSCderivedfromTheNationResearchCenterofCellProduction,hUCMSCculturedi
6、ntheDulbccco'sModifiedEagle'sMedium/F-12NutrientMixture(DM:EM,F(xiàn).12)withlowglucosecontaining10%fetalbovineserum,flowcytometricanalysisWasperformedtoexaminetheexpressionofcellsurfacemoleculesOUhUCMSC.HUCMSC丘omthethirdpassageweregrownincompletemedium(A),inducti
7、veserum-freemedium(B),inductivemediumwith5%fetalbovinesemm(q,inductivemediumwith10%fetalbovinescram(D)respectively.ThegrowthoftheculturedhUCMSCWasobserved.Tbesyntheticproteoglycamweredetectedbytoluidinebluestaining.Immunohistochemistryandinsituhybridizationw
8、ereappliedtodetecttheexpressionofcollagentypeII.11虻proliferationofthecellswasexaminedbyMTTtesLResultsAfterproliferationinvitro.Tbeadherentcellsshowedaspindle—likeappearanceandexpressedpositiveCD