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1、FHIT基因轉(zhuǎn)染對肝癌細(xì)胞系HepG2的作用【關(guān)鍵詞】肝癌RoleoftransfectionofFHITgeneinhumanhepatocellularcarcinomacelllineHepG2 【Abstract】AIM:TostudytheroleoftransfectionofFHITgeneintoahumanlivercancercelllineHepG2.METHODS:FHITgeneanlivercancercelllineHepG2bylipofectamine.Aftersel
2、ectionmunochemistryand).Themorphologicalchangesicroscope.RESULTS:StableexpressionofFHITproteinintransfectedHepG2cellsissionelectronmicroscopeandfloetryshoSphasetoG2phase.CONCLUSION:TheresultsindicatethatFHITgenecaninhibitthegroa 【摘要】目的:探討外源性FHIT基因的表達(dá)對肝癌細(xì)
3、胞株HepG2的影響.方法:用脂質(zhì)體介導(dǎo)法將pcDNA3.1FHIT及空載體pcDNA3.1(+)導(dǎo)入肝癌細(xì)胞系HepG2中,G418選擇培養(yǎng),經(jīng)免疫組化和EM培養(yǎng)液中,CO2孵箱,37℃培養(yǎng),當(dāng)細(xì)胞處于對數(shù)生長期的時(shí)候收獲細(xì)胞.將細(xì)胞爬片用10mmol/LPBS洗2min×2,丙酮固定20min.10mmol/LPBS洗4min×2,作細(xì)胞爬片HE染色.取對數(shù)生長期的3組細(xì)胞,接種于100mL培養(yǎng)瓶中.待細(xì)胞鋪滿瓶底的80%時(shí),胰蛋白酶消化,10mmol/LPBS洗滌,收集細(xì)胞于Ep管內(nèi),40g/L戊二
4、醛4℃固定過夜,包埋時(shí)用10mmol/LPBS洗3次,每次10min.10g/L鋨酸固定4℃,1h,系列丙酮脫水,Epon812樹脂包埋,修塊,制備超薄切片,鈾鉛雙重染色,透射電鏡觀察并照相. 1.2.2細(xì)胞生長特性分析取對數(shù)生長期的pcDNA3.1FHIT轉(zhuǎn)染組、pcDNA3.1(+)空載體轉(zhuǎn)染組細(xì)胞及未轉(zhuǎn)染對照組,用胰蛋白酶消化,制成單細(xì)胞懸液.分別接種于24孔培養(yǎng)板,1×104細(xì)胞/孔.從接種2d起,每24h用胰蛋白酶消化細(xì)胞,用血細(xì)胞計(jì)數(shù)板計(jì)數(shù),每個(gè)孔計(jì)3次,每個(gè)時(shí)間點(diǎn)每種細(xì)胞設(shè)4個(gè)平行孔,取其
5、平均值.以培養(yǎng)時(shí)間為橫軸,細(xì)胞數(shù)為縱軸,繪制細(xì)胞的生長曲線.取對數(shù)生長期的3組細(xì)胞,接種于100mL培養(yǎng)瓶中.待細(xì)胞80%鋪滿時(shí),用2.5g/L胰蛋白酶0.2g/LEDTA液消化,使細(xì)胞成為單細(xì)胞懸液,10mmol/LPBS洗3次,收集細(xì)胞加入4℃預(yù)冷的700mL/L乙醇10mmol/LPBS,吹打均勻,4℃固定2h以上.10mmol/LPBS洗滌1次,用含10mL/LTritonX100,0.1g/LRnase酶處理細(xì)胞30min.5g/L碘化丙(PropidiumIodide,PI)4℃,20min,
6、過300目尼龍網(wǎng).上流式細(xì)胞儀測定在488nm波長下DNA含量,用Multicycle軟件分析細(xì)胞周期分布. 2結(jié)果 轉(zhuǎn)化、擴(kuò)增、提取及純化的質(zhì)粒pcDNA3.1FHIT,經(jīng)測序證實(shí)FHIT序列與GenBank數(shù)據(jù)庫所收錄的FHIT序列完全一致.pcDNA3.1FHIT轉(zhuǎn)染組的HepG2細(xì)胞在胞質(zhì)中可見棕黃色染色,pcDNA3.1(+)轉(zhuǎn)染組和未轉(zhuǎn)染對照組的HepG2細(xì)胞未見明顯染色,提示FHIT蛋白表達(dá)于細(xì)胞質(zhì)中(Fig1).pcDNA3.1FHIT轉(zhuǎn)染組HepG2細(xì)胞裂解液通過r17000的蛋白條
7、帶(Fig2),未轉(zhuǎn)染對照組和pcDNA3.1(+)轉(zhuǎn)染組中未檢測到FHIT蛋白的表達(dá).證實(shí)了構(gòu)建的真核表達(dá)載體pcDNA3.1FHIT經(jīng)轉(zhuǎn)染后可在肝癌細(xì)胞HepG2中穩(wěn)定過表達(dá)FHIT蛋白. 2.1細(xì)胞形態(tài)學(xué)細(xì)胞爬片的HE染色經(jīng)生物顯微鏡觀察,轉(zhuǎn)染FHIT基因組細(xì)胞形態(tài)與空載體轉(zhuǎn)染組細(xì)胞及未轉(zhuǎn)染組細(xì)胞均伸展良好,3種細(xì)胞均呈多梭A:HepG2cells;B:pcDNA3.1HepG2cells; 形或多角形,大小不等,可見核分裂像及多個(gè)核仁,未見明顯變化.透射電鏡觀察,轉(zhuǎn)染空載體組細(xì)胞和未轉(zhuǎn)染組的細(xì)
8、胞,細(xì)胞超微結(jié)構(gòu)無明顯差異,細(xì)胞圓形、卵圓形較多,細(xì)胞表面微絨毛均較豐富,細(xì)胞核大,核質(zhì)比例大,核的異形性明顯,呈腎形、馬蹄形,有些凹陷.胞質(zhì)透亮,染色質(zhì)分布均勻,每個(gè)細(xì)胞內(nèi)可見2~3個(gè)核仁.核分裂較多見.與轉(zhuǎn)染空載體組和未轉(zhuǎn)染組的細(xì)胞相比,轉(zhuǎn)染FHIT組細(xì)胞大小不等,細(xì)胞表面的微絨毛減少.核仁明顯,核染色質(zhì)輕度邊集,內(nèi)質(zhì)網(wǎng)明顯擴(kuò)張,線粒體聚集,細(xì)胞質(zhì)可見較多空泡、溶酶體及糖原(Fig3). 2.2細(xì)胞生長特性未轉(zhuǎn)染組和空載