Downregulation of the mitochondrial phosphatase PTPMT1 is sufficient to promote cancer cell death.

Downregulation of the mitochondrial phosphatase PTPMT1 is sufficient to promote cancer cell death.
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DOI:
10.1371/journal.pone.0053803
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
MacKeigan JP
MacKeigan JP
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Niemi NM;Lanning NJ;Westrate LM;MacKeigan JP

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定位于线粒体的蛋白酪氨酸磷酸酶 1 (PTPMT1) 是一种专门定位于线粒体的双特异性磷酸酶,最近被证明是心磷脂生物合成途径的关键组成部分。胰腺β细胞中PTPMT1的下调已被证明可以增加细胞ATP水平和胰岛素产生,然而,PTPMT1在癌细胞中的普遍作用尚未得到表征。在这里,我们报告 PTPMT1 活性的下调足以诱导癌细胞凋亡。此外,PTPMT1 的沉默会降低癌细胞中的心磷脂水平,同时选择性地增加糖酵解介质中的 ATP 水平。此外,PTPMT1 的亚致死下调与低剂量紫杉醇协同作用,可促进癌细胞死亡。我们的数据表明,抑制 PTPMT1 会导致癌细胞发生代谢危机,从而诱导细胞死亡,这可能是癌细胞对当前可用疗法敏感的一种机制。
Protein Tyrosine Phosphatase localized to the Mitochondrion 1 (PTPMT1) is a dual specificity phosphatase exclusively localized to the mitochondria, and has recently been shown to be a critical component in the cardiolipin biosynthetic pathway. The downregulation of PTPMT1 in pancreatic beta cells has been shown to increase cellular ATP levels and insulin production, however, the generalized role of PTPMT1 in cancer cells has not been characterized. Here we report that downregulation of PTPMT1 activity is sufficient to induce apoptosis of cancer cells. Additionally, the silencing of PTPMT1 decreases cardiolipin levels in cancer cells, while selectively increasing ATP levels in glycolytic media. Additionally, sublethal downregulation of PTPMT1 synergizes with low doses of paclitaxel to promote cancer cell death. Our data suggest that inhibition of PTPMT1 causes a metabolic crisis in cancer cells that induces cell death, and may be a mechanism by which cancer cells can be sensitized to currently available therapies.
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