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ER-α36对乳腺癌细胞Herceptin敏感性的影响

, PP. 1080-1085

Keywords: Herceptin,乳腺癌,抵抗,ER-&alpha

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Abstract:

目的探讨乳腺癌细胞中雌激素受体α36(estrogenreceptorα36,ER-α36)对人表皮生长因子受体2(humanepidermalgrowthfactorreceptor2,HER2)人源化单克隆抗体赫赛汀(Herceptin)治疗敏感性的影响。方法Westernblot对G418筛选的BT474/ER-α36细胞和对照细胞BT474/V进行表型鉴定;细胞增殖分析观察常规培养条件下和雌二醇(E2)存在与否的条件下配对细胞对Herceptin敏感性的差异;Westernblot检测Herceptin处理前后配对细胞中E2诱导的Akt及MAPK磷酸化差异。结果筛选并鉴定了ER-α36过表达的BT474/ER-α36细胞及对照细胞BT474/V;常规培养下,Herceptin对BT474/ER-α36和BT474/V细胞的增殖抑制率分别为(22.00±0.06)%和(42.00±0.06)%,与对照细胞比较,BT474/ER-α36细胞对Herceptin的敏感性明显减弱(P<0.01);细胞经去类固醇处理后,在E2存在的情况下,Herceptin对BT474/ER-α36和BT474/V细胞的增殖抑制率分别为(34.00±0.06)%和(53.00±0.06)%,E2显著降低了BT474/ER-α36对Herceptin的敏感性(P<0.01);BT474/ER-α36细胞E2诱导的HER2下游信号分子Akt和MAPK磷酸化水平分别上调了3.08倍和2.63倍,而BT474/V细胞E2诱导的Akt和MAPK磷酸化水平仅分别上调了2.37倍和1.72倍,与对照细胞比较,BT474/ER-α36细胞具有更强的E2非基因组活性,并且该细胞中Herceptin抑制Akt及MAPK磷酸化的效应明显减弱(P<0.01)。结论ER-α36可通过非基因组活性影响乳腺癌细胞Herceptin的敏感性。

References

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