Syndecan-4 regulates subcellular localization of mTOR Complex2 and Akt activation in a PKCalpha-dependent manner in endothelial cells.

Syndecan-4 regulates subcellular localization of mTOR Complex2 and Akt activation in a PKCalpha-dependent manner in endothelial cells.
复制标题

Syndecan-4 在内皮细胞中以 PKCα 依赖性方式调节 mTOR Complex2 的亚细胞定位和 Akt 激活。

DOI:
10.1016/j.molcel.2008.09.010
复制
发表时间:
2008-10-10
期刊:
影响因子:
16
通讯作者:
Simons, Michael
Simons, Michael
中科院分区:
生物学1区
文献类型:
--
作者:
Partovian, Chohreh;Ju, Rong;Zhuang, Zhen W.;Martin, Kathleen A.;Simons, Michael

文献摘要

参考文献

被引文献

相似文献

哺乳动物雷帕霉素靶蛋白(mTOR)活性受两种功能不同的复合物mTORC 1和mTORC 2的组装调节。在syndecan-4(S4)空内皮细胞中,mTORC 2活性降低,导致Akt活化降低,而mTORC 1活性增加。总细胞裂解物中rictor、mLST 8和mSin-1的水平不变,但在S4−/−内皮细胞筏中降低,PKCα的水平也是如此。肉豆蔻酰化PKC α在S4−/−细胞中的表达恢复了rictor、mLST 8和mSin-1在筏中的存在,并挽救了Akt磷酸化。PKCα敲低模拟S4缺失对mTORC 2定位和Akt激活的影响。S4−/−内皮细胞中mTORC 2活性降低导致FOXO 1/3a和eNOS磷酸化降低,内皮细胞尺寸减小,S4−/−小鼠动脉血压升高。因此,PKCα的S4依赖性靶向质膜是mTORC 2组分募集到筏和Akt激活所必需的。
Mammalian target of rapamycin (mTOR) activity is regulated by assembly of two functionally distinct complexes, mTORC1 and mTORC2. In syndecan-4 (S4) null endothelial cells, mTORC2 activity is reduced, resulting in decreased Akt activation, while mTORC1 activity is increased. Levels of rictor, mLST8, and mSin-1 are unchanged in total cell lysates but decreased in the rafts of S4−/− endothelial cells, as is the level of PKCα. Expression of myristoylated-PKCα in S4−/− cells restores rictor, mLST8, and mSin-1 presence in the rafts and rescues Akt phosphorylation. PKCα knockdown mimics the effect of S4 deletion on mTORC2 localization and Akt activation. Reduced mTORC2 activity in S4−/− endothelial cells results in decreased FOXO1/3a and eNOS phosphorylation, decreased endothelial cell size and increased arterial blood pressure in S4−/− mice. Thus, S4-dependent targeting of PKCα to the plasma membrane is required for recruitment of mTORC2 components to the rafts and Akt activation.
DOI: 10.1161/01.atv.20.6.1443
发表时间: 2000-06-01
影响因子: 8.7
作者:
Balconi, G;Spagnuolo, R;Dejana, E
通讯作者: Dejana, E
DOI: 10.1074/jbc.273.40.25548
发表时间: 1998-10-02
影响因子: 4.8
作者:
Horowitz, A;Simons, M
通讯作者: Simons, M
DOI: 10.1016/j.cub.2004.08.026
发表时间: 2004-09-21
期刊: CURRENT BIOLOGY
影响因子: 9.2
作者:
Shah, OJ;Wang, ZY;Hunter, T
通讯作者: Hunter, T
DOI: 10.1083/jcb.146.5.1147
发表时间: 1999-09-06
期刊: The Journal of cell biology
影响因子: --
作者:
Rabinovitz I;Toker A;Mercurio AM
通讯作者: Mercurio AM
DOI: 10.1152/ajprenal.0144.2001
发表时间: 2002-01-01
影响因子: 4.2
作者:
Beierwaltes, WH;Potter, DL;Shesely, EG
通讯作者: Shesely, EG