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1、四嗪二甲酰胺誘導(dǎo)白血病細(xì)胞株SHI1凋亡及其分子機(jī)制研究:周永列,呂亞萍,胡惟孝,邱蓮女,王文松,劉建棟,吳建國(guó)【摘要】 本研究探討四嗪二甲酰胺(ZGDHu1)誘導(dǎo)白血病細(xì)胞株SHI1凋亡作用的機(jī)制。以不同濃度的ZGDHu1在體外培養(yǎng)SHI1細(xì)胞,用細(xì)胞形態(tài)學(xué)、DNA凝膠電泳、DNA含量及細(xì)胞周期分析、AnnexinV/PI雙標(biāo)記和Hoechst33258熒光染色等分析細(xì)胞凋亡。用Rh123/PI測(cè)定線粒體跨膜電位(ΔΨm),用流式細(xì)胞術(shù)檢測(cè)ZGDHu1誘導(dǎo)SHI1細(xì)胞凋亡過程中bcl2、bax、p53、
2、Fas蛋白和線粒體膜蛋白的表達(dá)變化。用RTPCR觀察經(jīng)ZGDHu1作用后SHI1細(xì)胞bcl2、bax、p53基因表達(dá)改變;同時(shí)利用實(shí)時(shí)熒光PCR定量檢測(cè)端粒酶hTERTmRNA表達(dá)的變化。結(jié)果表明:ZGDHu1能誘導(dǎo)SHI1細(xì)胞凋亡,呈作用時(shí)間和劑量的量效關(guān)系,出現(xiàn)典型的細(xì)胞形態(tài)改變,DNA片段化,亞G1峰檢出并顯著增加;AnnexinV/PI和Hoechst33258熒光染色后細(xì)胞發(fā)生凋亡的特征性改變。SHI1細(xì)胞經(jīng)不同濃度的ZGDHu1體外培養(yǎng)后,bcl2基因和蛋白有所下調(diào),但主要是bax基因和蛋白
3、上調(diào),導(dǎo)致bax/bcl2比值明顯增高,p53基因和蛋白與Fas蛋白表達(dá)也上調(diào),均呈劑量依賴性。隨ZGDHu1作用濃度的增加,ΔΨm下降,而線粒體膜蛋白表達(dá)顯著升高,端粒酶hTERTmRNA的表達(dá)顯著下調(diào)。結(jié)論:ZGDHu1通過上調(diào)p53基因、bax基因和bax/bcl2比值,使線粒體跨膜電位顯著下降的線粒體通路是ZGDHu1誘導(dǎo)細(xì)胞凋亡的途徑之一,F(xiàn)as也參與其中,端粒酶有可能是其抗腫瘤的作用靶點(diǎn)?!娟P(guān)鍵詞】四嗪二甲酰胺 細(xì)胞株 SHI1 細(xì)胞凋亡 線粒體 端粒酶 AbstractTheaimofstudye
4、chanismofN,N′di(mmethylphenyl)3,6dimethyl1,4dihydro1,2,4,5tetrazine1,4dicarboamide(ZGDHu1)inducingapoptosisinSHI1humanleukemiacellline.DifferentconcentrationsofZGDHu1anddifferenttimesofcultureorphology,DNAagarosegelelectrophoresis,DNAcontentdetection,
5、AnnexinV/PIandHoechst33258labelingmethod,themitochondrialtransmembrancepotential(ΔΨm)easuredbydihydrorhodamin123,andexpressionsofbcl2,bax,Fas,p53andmitochondrialmembraneproteinetry,RNAeasuredbyrealtimefluorescencequantitativeRTPCR.Theresultsshoeanddoesdepende
6、ntmanner.SHI1cellapoposisedbytypicalcellmorphology,DNAfragmentation,subG1phase,Hoechst33258andAnnexinⅤ/PIlabelingetc.Theexpressionofbax,bax/bcl2,p53andFasgenesignificantlyincreasedandbcl2slightlydecreased.ZGDHu1couldincreasedtheexpressionofmitochondrialmembra
7、neproteininadosedependentmannerreduced.TheexpressionofhTERTmRNAsignificantlydecreased.ItisconcludedthatZGDHu1canupregulatetheexpressionofp53,baxandbax/bcl2.Themitochondrialpathediatedbydescentofmitochondrialtransmembrancepotentialmaybeoneofthemechanismsinducin
8、gapoptosisbyZGDHu1,inerasemaybeaneffectivegenetargetforantitumoureffectofZGDHu1.Keymethylphenyi)3,6dimethyl1,4dihydro1,2,4,5tetrazine1