Evaluation of a UCMK/dCK fusion enzyme for gemcitabine-mediated cytotoxicity.

Evaluation of a UCMK/dCK fusion enzyme for gemcitabine-mediated cytotoxicity.
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评估 UCMK/dCK 融合酶对吉西他滨介导的细胞毒性。

DOI:
10.1016/j.bbrc.2011.11.025
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发表时间:
2011
影响因子:
3.1
通讯作者:
Black,MargaretE
Black,MargaretE
中科院分区:
生物学4区
文献类型:
--
作者:
Johnson,AdamJ;Brown,MelissaN;Black,MargaretE

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虽然吉西他滨(2 ' -2 ' -二氟-2 ' -脱氧胞苷,dFdC)作为单一药物具有广泛的抗肿瘤活性,但可变的反应率和较差的细胞内代谢往往限制了其临床疗效。为了提高dFdC的细胞毒性并帮助使反应率正常化,我们创造了一种双功能融合酶,它将脱氧胞苷激酶(dCK)和尿苷/胞苷单磷酸激酶(UCMK)的酶活性结合在一个多肽中。我们的目标是评估所创建的融合是否可以诱导对dFdC有益的功能变化,加速dFdC向其活性抗代谢产物的转化,从而增强细胞dFdC的敏感性。虽然动力学分析显示UCMK/dCK融合酶具有两种天然活性,但融合使细胞对dFdC的细胞毒性作用敏感,其水平与单独表达dCK相同。这些结果表明,野生型UCMK表达的增加并没有显著增强dfdc介导的细胞毒性,因此可能需要开展旨在提高对单磷酸吉西他滨活性的UCMK基因工程变体的研究。
While gemcitabine (2′-2′-difluoro-2′-deoxycytidine, dFdC) displays wide-ranging antineoplastic activity as a single agent, variable response rates and poor intracellular metabolism often limit its clinical efficacy. In an effort to enhance dFdC cytotoxicity and help normalize response rates, we created a bifunctional fusion enzyme that combines the enzymatic activities of deoxycytidine kinase (dCK) and uridine/cytidine monophosphate kinase (UCMK) in a single polypeptide. Our goal was to evaluate whether the created fusion could induce beneficial, functional changes toward dFdC, expedite dFdC conversion to its active antimetabolites and consequently amplify cell dFdC sensitivity. While kinetic analyses revealed the UCMK/dCK fusion enzyme to possess both native activities, the fusion rendered cells sensitive to the cytotoxic effects of dFdC at the same level as dCK expression alone. These results suggest that increased wild-type UCMK expression does not provide a significant enhancement in dFdC-mediated cytotoxicity and may warrant the implementation of studies aimed at engineering UCMK variants with improved activity toward gemcitabine monophosphate.
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