Cellular targets for activation by c-Myc include the DNA metabolism enzyme thymidine kinase.

Cellular targets for activation by c-Myc include the DNA metabolism enzyme thymidine kinase.
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c-Myc 激活的细胞靶标包括 DNA 代谢酶胸苷激酶。

DOI:
10.1089/dna.1997.16.737
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发表时间:
1997
影响因子:
3.1
通讯作者:
M. Hengstschläger
M. Hengstschläger
中科院分区:
生物学4区
文献类型:
--
作者:
O. Pusch;T. Soucek;E. Hengstschläger;G. Bernaschek;M. Hengstschläger

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尽管已经确定了大量通过c-Myc激活或抑制的基因,但其中只有少数明显有助于Myc的生物学效应--诱导增殖。我们发现,在恶性生长的细胞中,Myc的过表达特异性地诱导胸苷激酶(TK)mRNA表达和酶活性,而Myc的一个等位基因的缺失导致该酶的下调。我们发现,激活Myc触发高水平的这种通常严格的S期调节的DNA代谢酶在血清中被捕的G0细胞,并导致高和恒定水平的TK表达在整个正在进行的细胞周期。Myc诱导TK需要完整的转录激活结构域。Myc诱导的这种酶的失调是由TK启动子的E2F位点的蛋白结合的改变引起的。我们进一步表明,细胞生长阻滞的细胞周期蛋白依赖性激酶抑制剂p16被废除过表达的Myc和共同过表达的p16不能抑制Myc诱导的TK表达上调。我们的数据表明TK是Myc的细胞靶点,与细胞增殖状态无关,并提供了转录因子E2F可能参与这一过程的证据。
Although a remarkable number of genes has been identified that are either activated or repressed via c-Myc, only few of them obviously contribute to Myc's biological effect--the induction of proliferation. We found that in logarithmically growing cells overexpression of Myc specifically induces thymidine kinase (TK) mRNA expression and enzyme activity, whereas loss of one allele of Myc causes downregulation of this enzyme. We show that activation of Myc triggers high levels of this normally strictly S-phase-regulated DNA metabolism enzyme in serum arrested G0 cells and causes high and constant levels of TK expression throughout the entire ongoing cell cycle. Induction of TK by Myc requires an intact transcriptional activation domain. Myc-induced deregulation of this enzyme is paralleled by alterations of protein binding at the E2F-site of the TK promoter. We further show that cell growth arrest by the cyclin-dependent kinase inhibitor p16 is abrogated by overexpression of Myc and that co-overexpression of p16 cannot inhibit the Myc-induced up-regulation of TK expression. Our data demonstrate TK to be a cellular target of Myc independently of the status of cell proliferation and provide evidence that the transcription factor E2F might be involved in this process.
DOI: 10.1126/science.2251503
发表时间: 1990-11-23
期刊: SCIENCE
影响因子: 56.9
作者:
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DOI: --
发表时间: 1994
期刊: The Journal of biological chemistry
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发表时间: 1993-08-15
影响因子: 11.1
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发表时间: 1994-04-08
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