Evidence that inositol polyphosphate 4-phosphatase type II is a tumor suppressor that inhibits PI3K signaling.

Evidence that inositol polyphosphate 4-phosphatase type II is a tumor suppressor that inhibits PI3K signaling.
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DOI:
10.1016/j.ccr.2009.06.006
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发表时间:
2009-08-04
期刊:
影响因子:
50.3
通讯作者:
Cantley LC
Cantley LC
中科院分区:
医学1区
文献类型:
--
作者:
Gewinner C;Wang ZC;Richardson A;Teruya-Feldstein J;Etemadmoghadam D;Bowtell D;Barretina J;Lin WM;Rameh L;Salmena L;Pandolfi PP;Cantley LC

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我们报告说,敲低人上皮细胞中肌醇多磷酸4-磷酸酶II型(INPP 4 B)的表达,如敲低PTEN,导致Akt激活增强,锚定非依赖性生长,并增强了所有的运动。在异种移植实验中,INPP 4 B的过表达导致肿瘤生长减少。INPP 4 B优先水解磷脂酰肌醇-3,4-二磷酸(PI(3,4)P2),而对磷脂酰肌醇-3,4,5-三磷酸(PI(3,4,5)P3)没有影响,表明PI(3,4)P2和PI(3,4,5)P3可能在Akt活化和细胞转化中协同作用。INPP 4 B和PTEN的双重敲低导致细胞衰老。最后,我们发现在大多数基底细胞样乳腺癌以及相当一部分卵巢癌中INPP 4 B基因座存在杂合性缺失(洛H),这与所有患者的生存率较低相关,表明INPP 4 B是一种肿瘤抑制因子。
We report that knocking down the expression of inositol polyphosphate 4-phosphatase type II (INPP4B) in human epithelial cells, like knockdown of PTEN, resulted in enhanced Akt activation, anchorage-independent growth, and enhanced over all motility. In xenograft experiments overexpression of INPP4B resulted in reduced tumor growth. INPP4B preferentially hydrolyzes phosphatidylinositol-3,4-bisphosphate (PI(3,4)P2) with no effect on phosphatidylinositol-3.4.5-triphosphate (PI(3,4,5)P3), suggesting that PI(3,4)P2 and PI(3,4,5)P3 may cooperate in Akt activation and cell transformation. Dual knockdown of INPP4B and PTEN resulted in cellular senescence. Finally, we find loss-of-heterozygosity (LOH) at the INPP4B locus in a majority of basal-like breast cancers as well as in a significant fraction of ovarian cancers, which correlated with lower over all patient survival, suggesting that INPP4B is a tumor suppressor.
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