The HER2-binding affibody molecule (Z(HER2∶342))₂ increases radiosensitivity in SKBR-3 cells.

The HER2-binding affibody molecule (Z(HER2∶342))₂ increases radiosensitivity in SKBR-3 cells.
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HER2结合分子分子(Z(HER2∶342))₂增加了SKBR-3细胞的放射敏性。

DOI:
10.1371/journal.pone.0049579
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Gedda L
Gedda L
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ekerljung L;Lennartsson J;Gedda L

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我们先前已经证明HER 2特异性的ZHER 2 ∶342抑制SKBR-3细胞的增殖。在这里,我们继续研究其生物学效应,在体外研究受体二聚化和克隆存活照射后。我们发现(ZHER 2 ∶342)2可使HER 2过表达细胞系SKBR-3对电离辐射增敏。与未处理组(S8戈伊0.023)相比,暴露于(ZHER 2:342)2和8戈伊(S8戈伊0.006)后的生存率下降了四分之一。低表达HER 2的MCF-7细胞株比SKBR-3细胞株放射敏感,但对(ZHER 2 ∶342)2无反应。即使在刺激5分钟后,(ZHER 2 ∶342)2处理也强烈增加了二聚化和磷酸化HER 2的水平。单体ZHER 2 ∶342似乎不能诱导受体磷酸化和二聚化或使细胞对辐射敏感。
We have previously shown that the HER2-specific affibody molecule (ZHER2∶342)2 inhibits proliferation of SKBR-3 cells. Here, we continue to investigate its biological effects in vitro by studying receptor dimerization and clonogenic survival following irradiation. We found that (ZHER2∶342)2 sensitizes the HER2-overexpressing cell line SKBR-3 to ionizing radiation. The survival after exposure to (ZHER2∶342)2 and 8 Gy (S8Gy 0.006) was decreased by a factor four compared to the untreated (S8Gy 0.023). The low HER2-expressing cell line MCF-7 was more radiosensitive than SKBR-3 but did not respond to (ZHER2∶342)2. Treatment by (ZHER2∶342)2 strongly increased the levels of dimerized and phosphorylated HER2 even after 5 minutes of stimulation. The monomeric ZHER2∶342 does not seem to be able to induce receptor phosphorylation and dimerization or sensitize cells to irradiation.
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