Thapsigargin resistance in human prostate cancer cells.

Thapsigargin resistance in human prostate cancer cells.
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人类前列腺癌细胞中的毒胡萝卜素耐药性。

DOI:
10.1002/cncr.22027
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发表时间:
2006
期刊:
影响因子:
6.2
通讯作者:
Hussain,Arif
Hussain,Arif
中科院分区:
医学1区
文献类型:
--
作者:
O'Neill,JohnP;Velalar,ChidambaramNatesa;Lee,DongIk;Zhang,Bin;Nakanishi,Takeo;Tang,Yao;Selaru,Florin;Ross,Douglas;Meltzer,StephenJ;Hussain,Arif

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背景 Thapsigargin (TG) 是一种有效的肌浆/内质网 Ca2+ ATP 酶 (SERCA) 抑制剂。基于 TG 的前药正在开发用于治疗前列腺癌 (PC)。为了开发最佳的基于 TG 的疗法,了解癌细胞中可能发生的 TG 耐药机制非常重要。方法DU145/TG 和 PC3/TG 细胞分别通过增加接触 TG 衍生自人类 PC DU145 和 PC3 细胞。使用生长测定、蛋白质印迹分析、cDNA 微阵列、半定量和实时聚合酶链反应 (PCR)、Northern 印迹分析和免疫组织化学来研究这些细胞。RESULTSDU145/TG 细胞对 TG 的耐药性是 1100 倍,PC3/TG 细胞对 TG 的耐药性是 1350 倍。尽管 SERCA 和 p-糖蛋白的表达均可介导仓鼠细胞中的 TG 抗性,但两者在 DU145/TG 细胞中均不受调节。相比之下,在 PC3/TG 细胞中,SERCA(而非 p-糖蛋白)显着过度表达,但其本身无法解释这些细胞对 TG 1350 倍的耐药性。 DU145/TG 和 PC3/TG 细胞中调节了一些先前未发现会因 TG 选择而改变的基因。此外,DU145/TG 细胞中调节的基因谱与 PC3/TG 细胞中的不同,尽管这两种细胞均源自前列腺并且具有相同的 TG 抗性表型。 结论 PC 细胞可以适应 TG 的 SERCA 抑制。然而,它们在 TG 选择后的基因表达方面表现出了细胞类型特异性的可塑性。此外,先前未描述的耐药机制似乎在 TG 耐药性 PC 细胞中被招募,这为研究 PC 对 TG 介导的 Ca2+ 稳态失调的耐药和适应机制提供了一种新的模型。癌症 2006。© 2006 美国癌症协会。
BACKGROUNDThapsigargin (TG) is a potent inhibitor of sarcoplasmic/endoplasmic reticulum Ca2+ATPases (SERCAs). TG‐based prodrugs are being developed for the treatment of prostate cancer (PC). To develop optimal TG‐based therapeutics it is important to understand the mechanisms of resistance to TG that may potentially occur in cancer cells.METHODSDU145/TG and PC3/TG cells were derived from human PC DU145 and PC3 cells, respectively, by incremental exposure to TG. Growth assays, Western blot analyses, cDNA microarrays, semiquantitative and real‐time polymerase chain reaction (PCR), Northern blot analyses, and immunohistochemistry were used to study these cells.RESULTSDU145/TG cells are 1100‐fold and PC3/TG cells are 1350‐fold resistant to TG. Although expression of both SERCA and p‐glycoprotein can mediate TG resistance in hamster cells, neither is modulated in DU145/TG cells. In contrast, in PC3/TG cells, SERCA, and not p‐glycoprotein, is significantly overexpressed but cannot by itself account for the 1350‐fold resistance to TG in these cells. Several genes not previously identified to be altered by TG selection are modulated in DU145/TG and PC3/TG cells. Furthermore, the spectrum of genes modulated in DU145/TG cells are distinct from that in PC3/TG cells, even though both cells are of prostate origin and share the same TG‐resistant phenotype.CONCLUSIONSPC cells can adapt to SERCA inhibition by TG. However, they demonstrate cell type‐specific plasticity with respect to gene expression upon TG selection. Further, previously not described mechanisms of resistance appear to be recruited in the TG‐resistant PC cells, which provide a novel model to study mechanisms of resistance and adaptation in PC on TG‐mediated dysregulation of Ca2+homeostasis. Cancer 2006. © 2006 American Cancer Society.
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