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1、分類號(hào)S823.9學(xué)校代碼10129UDC636學(xué)號(hào)2009201099RepSox誘導(dǎo)牛成纖維細(xì)胞向脂肪細(xì)胞分化的研究RepSoxInducedBovineFibroblastCellsToAdipocyteDifferentiation申請(qǐng)人:李亞男學(xué)科門類:農(nóng)學(xué)學(xué)科專業(yè):臨床獸醫(yī)學(xué)研究方向:獸醫(yī)產(chǎn)科學(xué)指導(dǎo)教師:劉俊平副教授李向臣副研究員論文提交日期:二〇一二年五月摘要已有研究證明,小分子化合物RepSox可上調(diào)mESCs的BMP-3水平,促進(jìn)高效重編程。BMP-2、BMP-4具有誘導(dǎo)C3H10T1/2細(xì)胞向前脂肪細(xì)胞定向,經(jīng)誘導(dǎo)可分化為成熟
2、脂肪細(xì)胞的能力。本研究將成纖維細(xì)胞定向分化為脂肪細(xì)胞,可為脂肪組織工程種子細(xì)胞的獲得和研究,提供重要的實(shí)驗(yàn)參考。實(shí)驗(yàn)應(yīng)用顯微觀察、分子生物學(xué)技術(shù)、流式細(xì)胞檢測(cè)技術(shù)、免疫組織化學(xué)等手段,分析定向分化過(guò)程中BMP通路啟動(dòng)情況,細(xì)胞處理前后的周期及凋亡現(xiàn)象,增殖能力和細(xì)胞微絲骨架的變化情況,并首次從組蛋白修飾的角度研究細(xì)胞向前脂肪細(xì)胞定向的過(guò)程。實(shí)驗(yàn)結(jié)果:(1)15μMRepSox處理荷斯坦牛成纖維細(xì)胞3d,BMP2、Smad1、Smad2、Smad4表達(dá)量相對(duì)最高,微絲骨架結(jié)構(gòu)調(diào)整,逐漸以長(zhǎng)線狀平行排列,可作為處理細(xì)胞條件;(2)處理組與對(duì)照組相比,
3、細(xì)胞周期G0/G1期比例減少,S+G2/M期比例增加;染色體核型及細(xì)胞增殖能力正常;細(xì)胞H3S10磷酸化水平上升了95.6%、S28減弱了26.3%、H3K9甲基化水平上升了74.7%、H3K27甲基化水平下降了47.4%、H3K9乙酰化水平減弱了64.8%;(3)RepSox處理3d的細(xì)胞,更換含10%FBS+0.5mMIBMX+10μg/ml胰島素+1.0μM地塞米松+200μM吲哚美辛的標(biāo)準(zhǔn)培養(yǎng)液誘導(dǎo)14天,成功向脂肪細(xì)胞定向分化,BMP2、Smad1、Smad2、Smad4基因開(kāi)始沉默。成脂誘導(dǎo)2d時(shí)表達(dá)422/aP2基因,細(xì)胞數(shù)量增加至
4、RepSox處理2d時(shí)的2.79倍。RepSox通過(guò)激活BMP通路上游受體BMPR1A、BMPR1B,下游信號(hào)分子P-Smad3、ID1等啟動(dòng)整個(gè)通路的活性。結(jié)論:RepSox具有啟動(dòng)BMP通路,促進(jìn)成纖維細(xì)胞向前脂肪細(xì)胞定向,經(jīng)標(biāo)準(zhǔn)誘導(dǎo)分化為成熟脂肪細(xì)胞的能力。關(guān)鍵詞:RepSox;成脂分化;成纖維細(xì)胞;重編程RepSoxInducedbovinefibroblastcellstoadipocytedifferentiationAbstractExistingstudieshavedemonstratedthatsmallmolecularco
5、mpoundRepSoxraisestheBMP-3levelofmESCs,andpromotesefficientreprogramming.BMP-2andBMP-4possessthecapacityofinduceC3H10T1/2cellsdirectionallytowardspreadipocyteswhichcandifferentiateintomatureadipocytesthroughappropriateinduction.Inthisstudy,fibroblastsweretransdifferentiateddi
6、rectionallyintoadipocytes,aimingtoprovideexperimentalreferencesforthestudyonseedingcellsintheadiposetissueengineering.Microscopicobservations,molecularbiologicaltechniques,flowcytometry,immunofluorescencewereadoptedtoanalyzetheactivationofBMPpathway,thechangesincellcycleandap
7、optosis,thedynamicsofcellproliferationandmicrofilamentcytoskeletonintheprocessofdifferentiation,andforthefirsttimethedirectedinductionprocesstopreadipocyteswasunderstandedfromtheviewpointofhistonemodifications.Results:(1)Thetreatmentof15μMRepSoxonHolsteincattlefibroblastsfor3
8、dgottherelativelyhighestexpressionofBMP2,Smad1,Smad2,Smad4,andwithth