Proto-oncogene Src links lipogenesis via lipin-1 to breast cancer malignancy.

Proto-oncogene Src links lipogenesis via lipin-1 to breast cancer malignancy.
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原癌基因 Src 通过 lipin-1 将脂肪生成与乳腺癌恶性肿瘤联系起来

DOI:
10.1038/s41467-020-19694-w
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发表时间:
2020-11-17
影响因子:
16.6
通讯作者:
Lin SC
Lin SC
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Song L;Liu Z;Hu HH;Yang Y;Li TY;Lin ZZ;Ye J;Chen J;Huang X;Liu DT;Zhou J;Shi Y;Zhao H;Xie C;Chen L;Song E;Lin SY;Lin SC

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脂肪生成增加与癌症风险增加和预后不良有关;然而,潜在的机制仍然不清楚。在这里,我们发现磷脂酸磷酸酶(PAP)脂素-1,它产生合成甘油脂所必需的二甘油酯前体,与Src原致癌酪氨酸激酶相互作用,并且是其直接底物。肥胖相关的微环境因子和其他Src激活生长因子,包括表皮生长因子,激活Src并促进Src介导的脂素-1在Tyr398、Tyr413和Tyr795残基上的磷酸化。酪氨酸磷酸化脂质-1显著增加其PAP活性,加速甘油磷脂和甘油三酯的合成。三个酪氨酸残基转化为苯丙氨酸(3YF-lipin-1)会使lipin-1无法介导src增强的甘油脂合成、细胞增殖和异种移植物生长。3YF-lipin-1在PyVT中的再表达Lpin1−/−小鼠不能促进乳腺肿瘤的进展和转移。与邻近组织相比,人类乳腺肿瘤表现出增加的p- tyr1 -脂素水平。重要的是,统计分析表明p- tyr1 -lipin-1的水平与肿瘤大小、淋巴结转移、复发时间和患者生存相关。这些结果说明了促癌Src的直接脂肪生成促进作用,提供了肥胖相关的有丝分裂信号与乳腺癌恶性肿瘤之间的机制联系。
Increased lipogenesis has been linked to an increased cancer risk and poor prognosis; however, the underlying mechanisms remain obscure. Here we show that phosphatidic acid phosphatase (PAP) lipin-1, which generates diglyceride precursors necessary for the synthesis of glycerolipids, interacts with and is a direct substrate of the Src proto-oncogenic tyrosine kinase. Obesity-associated microenvironmental factors and other Src-activating growth factors, including the epidermal growth factor, activate Src and promote Src-mediated lipin-1 phosphorylation on Tyr398, Tyr413 and Tyr795 residues. The tyrosine phosphorylation of lipin-1 markedly increases its PAP activity, accelerating the synthesis of glycerophospholipids and triglyceride. Alteration of the three tyrosine residues to phenylalanine (3YF-lipin-1) disables lipin-1 from mediating Src-enhanced glycerolipid synthesis, cell proliferation and xenograft growth. Re-expression of 3YF-lipin-1 in PyVT;Lpin1−/−mice fails to promote progression and metastasis of mammary tumours. Human breast tumours exhibit increased p-Tyr-lipin-1 levels compared to the adjacent tissues. Importantly, statistical analyses show that levels of p-Tyr-lipin-1 correlate with tumour sizes, lymph node metastasis, time to recurrence and survival of the patients. These results illustrate a direct lipogenesis-promoting role of the pro-oncogenic Src, providing a mechanistic link between obesity-associated mitogenic signaling and breast cancer malignancy.
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发表时间: 2013-10
期刊: Biochimica et biophysica acta
影响因子: --
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期刊: MOLECULAR PLANT
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影响因子: 5.3
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