机构地区:[1]江苏省中西医结合医院妇产科,南京210028 [2]南京医科大学第一附属医院妇科,210029 [3]江苏省中西医结合医院妇产科
出 处:《中华妇产科杂志》2013年第5期364-369,共6页Chinese Journal of Obstetrics and Gynecology
基 金:国家自然科学基金(81272871);江苏省自然科学基金面上项目(BK2010576);江苏省六大人才高峰培养项目(303070774IB09);江苏省医学重点人才培养项目(苏卫科教[2011]15号)
摘 要:目的研究微小RNA-135a(miR-135a)对卵巢上皮性癌(卵巢癌)细胞系SKOV3细胞中HOXAIO基因表达及细胞增殖和凋亡的影响。方法(1)应用生物信息学技术预测与miR-135a高度相关的靶基因(即HOXAIO基因)。(2)将miR-135a成熟体模拟物(mimics)、miR-135a成熟体抑制物(inhibitor)及阴性对照分别转染SKOV3细胞,采用逆转录(RT)-PCR技术和蛋白印迹法检测转染不同时间(分别为24、48和72h)后SKOV3细胞中HOXAIOmRNA和蛋白的表达水平。(3)报告基因实验验证miR-135a对HOXAIO基因表达的调节作用,采用含miR-135a的质粒和含HOXAIO基因的重组质粒共同转染SKOV3细胞,以转染微小RNA(mirRNA)慢病毒质粒者为对照。(4)采用四甲基偶氮唑蓝(MTI')比色法检测转染不同时间(分别为24、48和72h)后SKOV3细胞的增殖能力[以吸光度(A)值表示],蛋白印迹法检测转染48h后SKOV3细胞中凋亡相关蛋白[包括bel-2、bax和半胱氨酸天冬氨酸蛋白酶3((3aspase-3)]的表达。结果(1)生物信息学技术预测,得出与miR-135a高度相关的靶基因为HOXAIO基因。(2)RT—PCR技术检测显示,随着转染时问的延长(分别为24、48和72h),mill-135amimics转染后SKOV3细胞中HOXAIOmRNA的表达水平(分别为0.94±0.04、0.78±0.03、0.70±0.03)逐渐降低(P〈0.05);miR-135ainhibitor转染后SKOV3细胞中HOXAIOmRNA的表达水平(分别为1.14±0.05、1.16±0.03、2.60±0.08)逐渐升高(P〈0.05);且两者转染48及72h后,分别与阴性对照(为1.00)比较,差异均有统计学意义(P〈0.01)。蛋白印迹法检测显示,转染不同时间后SKOV3细胞中HOXAIO蛋白的表达水平与HOXAIOmRNA的变化一致。(3)报告基因实验显示,含miR一135a的质粒和含HOXAIO基因的重组质粒共同转染SKOV3细胞后,与对照比较,其荧光素酶活性下降了67.8%(P〈0.01)。(4)MObjective To investigate the effects of miR-135a on HOXA10 expression, proliferation and apoptosis of SKOV3 cells. Methods ( 1 ) Through computer-aided algorithms, the predicted target gene of miR-135a (HOXA10)were detelanined. (2) miR-135a mimics, miR-135a inhibitor and negative control were transfected into SKOV3 cells, respectively. Reverse transcription (RT)-PCR, western blot analysis were used to examine the expression levels of HOXA10 at different times (24, 48 and 72 hours). (3) A luciferase reporter assay was used to confirm the direct regulation between miR-135a and HOXA10. (4) SKOV3 cells proliferation at different times (24,48 and 72 hours ) was detected by methyl thiazolyl tetrazolium(MTT) assay [ quantified by absorbance(A)]. Western blot was used to examine the expression of apoptosis-associated protein bcl-2, bax and easpase-3 in SKOV3 cells after 48 hours transfection. Results (1) HOXA10 was predicted to be the target gene of miR-135a by computer-aided algorithms. (2) RT-PCR shown that HOXA10 mRNA levels were decreased over time (24, 48 and 72 hours) after miR-135a mimics transfectionin SKOV3 cells (0.94 ± 0.04 vs 0.78 ±0.03 vs 0.70 ± 0.03, P 〈0.05).While, the expression of HOXA10 mRNA was increased over time 'after miR-135a inhibitor transfection ( 1.14 ± 0. 05 vs 1.16 ±0. 03 vs 2.60 ±0. 08 ,P 〈0. 05). After transfeeted with miR-135a mimics or miR-135a inhibitor over 48 and 72 hours, the HOXAI0 expression levels in SKOV3 cells were significantly lower or higher than each control group, respectively ( all P 〈 0. 01 ). Western blot analysis of HOXA10 expression in SKOV3 cells confirmed the results of RT-PCR detected. (3) After cotransfection of miR-135a plasmid and pMIR-REPORT luciferase plasmid containing HOXA10, luciferase reporter assays showed that the luciferase activity reduced by 67.8% (P 〈0. 01). (4) MTT showed that SKOV3 cells growth after miR-135a mimics transfection for 48 and 72 hours were signif
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