A role for survivin in radioresistance of pancreatic cancer cells.

A role for survivin in radioresistance of pancreatic cancer cells.
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DOI:
10.1111/j.1349-7006.2002.tb02483.x
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发表时间:
2002-09
期刊:
Japanese journal of cancer research : Gann
影响因子:
--
通讯作者:
Watanabe N
Watanabe N
中科院分区:
其他
文献类型:
--
作者:
Asanuma K;Kobayashi D;Furuya D;Tsuji N;Yagihashi A;Watanabe N

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使用基因转导的胰腺癌细胞,我们研究了生存素表达是否直接参与放射敏感性的调节。通常,用野生型生存素基因转导的放射敏感性MIAPaCa-2细胞(MS细胞)比用对照载体转导的细胞增殖更快。MS细胞的放射敏感性显著低于对照载体转导的细胞。在MS细胞中,caspase-3(但非caspase-7)的辐射诱导活性受到显著抑制。另一方面,将显性阴性突变体生存素基因转导到辐射抗性PANC-1细胞中增加了辐射敏感性。此外,辐射诱导的caspase-3活性增加增强,表明生存素功能确实受到抑制。这些结果表明,生存素表达直接下调放射敏感性。
Using gene‐transduced pancreatic cancer cells, we examined whether survivin expression is directly involved in regulation of radiosensitivity. Ordinarily radiosensitive MIAPaCa‐2 cells transduced with wild‐type survivin gene (MS cells) proliferated more rapidly than cells transduced with control vector. MS cells were significantly less radiosensitive than control vector‐transduced cells. Radiation‐induced activity of caspase‐3, but not caspase‐7, was significantly inhibited in MS cells. On the other hand, transduction of a dominant‐negative mutant survivin gene into radioresistant PANC‐1 cells augmented radiosensitivity. Further, the radiation‐induced increase in caspase‐3 activity was enhanced, indicating that survivin function was truly inhibited. These results indicate that survivin expression directly down‐regulates radiosensitivity.
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