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人白细胞介素21(interleukin-21,IL-21)是2000年新发现的细胞因子,人IL-21基因定位于4q26-27,IL-21 cDNA的开放阅读框编码了162个氨基酸残基的多肽前体,信号肽在Gly31部位断裂后形成由131个氨基酸残基构成的成熟肽,分子质量约为15 ×103[1]。IL-21与移植排斥反应[2]及自身免疫病[3]密切相关,并具有抗肿瘤作用[4-5]。本研究采用人IL-21基因重组腺病毒载体(adenovirus vector containing interleukin-21 gene,Ad-IL-21)转染人乳腺癌MCF-7细胞,联合不同剂量γ射线照射,观察IL-21基因联合照射对MCF-7细胞生长的影响,为进一步开展IL-21基因在肿瘤治疗中的应用奠定基础。
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人乳腺癌MCF-7细胞和Ad-IL-21[6]由本实验室构建并保存。RPMI 1640培养基由美国Gibco公司生产,小牛血清和胰酶由北京索莱宝公司生产,噻唑蓝由美国Amressco公司生产,分析纯二甲基亚砜由上海生工生物工程公司生产,酶标仪由美国Thermo公司生产,137Cs γ射线照射源由加拿大USD公司生产,吸收剂量率为0.75 Gy/min。
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MCF-7细胞用含10%小牛血清的RPMI 1640培养基,在37℃含5% CO2饱和湿度条件下培养。采用数字随机表法设立空白对照组(不做任何处理)、β-半乳糖苷酶基因重组腺病毒载体(adenovirus vector containing β-galactosidase gene, Ad-lacZ)对照组(含lacZ基因但不含IL-21基因的对照腺病毒)、γ射线照射组(137Cs γ射线照射源0~10 Gy照射)、Ad-IL-21组(含IL-21基因的重组腺病毒)和Ad- IL-21联合γ射线照射组(Ad-IL-21转染后6 h进行0~10 Gy照射,简称联合照射组)。
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取对数生长期的MCF-7细胞,按每孔3×103个细胞接种96孔板中,转染当日按上述分组处理,每组6个复孔,每孔加感染复数为100的Ad-IL-21(病毒滴度为9×1010 PFU/ml)稀释液。转染6 h后进行γ射线照射。每组分别于处理后培养48 h,加入0.5%噻唑蓝液20 μl,孵育4 h后用酶标仪测定492 nm处的吸光度(A492)值,按照下面公式计算细胞生长的抑制率:
$ \begin{array}{l} \;\;\;\;\;\;\;\;\;{\rm{抑制率}}\left( \% \right) = \left( {1 - {{\rm{实验组}}{\rm{A}}_{492}}{\rm{值}}/{\rm{对照组}}{{\rm{A}}_{492}}{\rm{值}}} \right) \times \\ 100{\rm{\% }}。 \end{array} $ -
采用SPSS 16.0软件进行方差分析比较存活细胞数量,P<0.05为差异有统计学意义。
白细胞介素21基因联合不同剂量γ射线照射对乳腺癌细胞生长的影响
Effects of interleukin-21 gene combined with different doses of γ-ray radiation on growth of breast carcinoma cells
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摘要:
目的 研究人白细胞介素21基因重组腺病毒载体(Ad-IL-21)联合不同剂量γ射线照射对人乳腺癌细胞体外生长的抑制作用。 方法 采用随机数字表法设立空白对照组、β-半乳糖苷酶基因重组腺病毒载体(Ad-LacZ)对照组、Ad- IL-21组、γ射线照射组和Ad- IL-21联合γ射线照射组(联合照射组),将Ad-IL-21于体外转染人乳腺癌MCF-7细胞,转染6 h后进行0~10 Gy 137Cs γ射线照射,用噻唑蓝法检测MCF-7细胞的生长抑制率。 结果 Ad-IL-21转染MCF-7细胞后,MCF-7细胞生长受到的抑制效应显著高于Ad-lacZ组(F=26.34,P<0.05),单独照射组和联合照射组的抑制率均显著高于Ad-IL-21组(F=23.51,F=27.55,P均<0.05),随着照射剂量的增大,细胞抑制率逐渐增高。同一照射剂量中,联合照射组对MCF-7细胞的抑制作用均显著高于γ射线照射组,联合照射组抑制率最高,与Ad-IL-21组和γ射线照射组比较,差异具有统计学意义(F=35.68,F=38.67,P均<0.05)。 结论 IL-21基因联合γ射线照射对乳腺癌细胞的抑瘤作用具有协同效应,有效地抑制肿瘤细胞的生长。 Abstract:Objective To study the effect of recombinant adenovirus vector carrying interleukin-21 gene(Ad-IL-21) combined with different doses of γ-ray radiation on the growth of breast neoplasms. Methods MCF-7 cells were transfected by Ad-IL-21 and exposed from 0 to 10 Gy 137Cs γ-ray 6 h after transfection. The cohorts were divided into 5 groups:blank control group, adenovirus vector containing β-galactosidase gene(Ad-LacZ) group, Ad-IL-21 group, γ-ray radiation group and Ad- IL-21 combined with radiation group. The inhibition rates of MCF-7 cells were detected by MTT assay. Results MCF-7 cells transfected with Ad- IL-21 were inhibited significantly greater than that of Ad-LacZ(F=26.34, P < 0.05). The inhibition rates of γ-ray radiation group and Ad-IL-21 combined with radiation group were significantly higher than that of Ad- IL-21 group(F=23.51, F=27.55, both P < 0.05)and the inhibition rate increased when γ-ray radiation doses increased. The inhibition rate of Ad- IL-21 combined with radiation group was higher than that of γ-ray radiation group at the same dose. The inhibition rate of Ad- IL-21 combined with radiation group was the highest, which was significantly higher than that of Ad- IL-21 group and γ-ray radiation group(F=35.68, F=38.67, both P < 0.05). Conclusion The recombinant Ad- IL-21 transfection combined with γ-ray radiation shows the synergism for the inhibition of the growth of MCF-7 cells. -
Key words:
- Breast neoplasms /
- Gene /
- Interleukin-21 /
- Radiotherapy /
- Gene therapy
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