c-Src is required for tropomyosin receptor kinase C (TrkC)-induced activation of the phosphatidylinositol 3-kinase (PI3K)-AKT pathway

被引:28
作者
Jin, Wook [1 ]
Yun, Chohee [2 ]
Jeong, Joon [3 ]
Park, Yangho [4 ]
Lee, Hy-De [3 ]
Kim, Seong-Jin [1 ,2 ]
机构
[1] Gachon Univ Med & Sci, Lee Gil Ya Canc & Diabet Inst, Lab Cell Regulat & Carcinogenesis, Inchon 406840, South Korea
[2] Case Western Reserve Univ, Ireland Canc Ctr, Dept Pediat, Cleveland, OH 44106 USA
[3] Yonsei Univ, Yongdong Severance Hosp, Seoul 135720, South Korea
[4] BRM Inst, Seoul 135822, South Korea
关键词
D O I
10.1074/jbc.M705052200
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
TrkC mediates many aspects of growth and development in the central nervous system. TrkC is expressed in a variety of non-neuronal tissues as well as human cancers. TrkC overexpression may drive tumorigenesis, invasion, and metastatic capability in cancer cells. However, relatively little is known about whether TrkC activity is also essential to maintain the malignant properties in human tumors. TrkC expression leads to the constitutive activation of two major effector pathways, namely the Ras-MAP kinase ( MAPK) mitogenic pathway and the phosphatidylinositol 3-kinase (PI3K)-AKT pathway mediating cell survival. However, it remains unclear how TrkC activates Ras-Erk1/2 and/or PI3K-Akt cascades. Here we define some aspects of the molecular mechanisms regulating TrkC-dependent Ras-Erk1/2 and PI3K/Akt activation. We show that endogenous TrkC associated with c-Src in human and mouse cancer cells which express TrkC. TrkC-c-Src complexes were also detected in primary human breast cancer tissues. Suppression of c-Src by RNA interference in highly metastatic 4T1 mammary cancer cells, which express endogenous TrkC, resulted in markedly decreased expression of cyclin D1 and suppression of activation of Ras-Erk1/2 and PI3K-Akt. Moreover, inhibition of c-Src expression almost completely blocks colony formation of 4T1 cells in soft agar. Furthermore, in c-Src-deficient SYF cells, TrkC failed to activate the PI3K-Atk pathway, but not the Ras-Erk1/2 pathway. Therefore these data indicate that TrkC induces the PI3K-Akt cascade through the activation of c-Src.
引用
收藏
页码:1391 / 1400
页数:10
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