S1P1 Threonine 236 Phosphorylation Mediates the Invasiveness of Triple-Negative Breast Cancer and Sensitivity to FTY720.
S1P1 Threonine 236 Phosphorylation Mediates the Invasiveness of Triple-Negative Breast Cancer and Sensitivity to FTY720.
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作者:
Laroche FJF;Li S;Shen N;Hwang SK;Nguyen G;Yu W;Wong CK;Quinton RJ;Berman JN;Liu CT;Singh A;Ganem NJ;Thiagalingam S;Feng H
Hyperactive sphingosine 1-phosphate (S1P) signaling is associated with a poor prognosis of triple-negative breast cancer (TNBC). Despite recent evidence that links the S1P receptor 1 (S1P1) to TNBC cell survival, its role in TNBC invasion and the underlying mechanisms remain elusive. Combining analyses of human TNBC cells with zebrafish xenografts, we found that phosphorylation of S1P receptor 1 (S1P1) at threonine 236 (T236) is critical for TNBC dissemination. Compared to luminal breast cancer cells, TNBC cells exhibit a significant increase of phospho-S1P1 T236 but not the total S1P1 levels. Misexpression of phosphorylation-defective S1P1 T236A (alanine) decreases TNBC cell migration in vitro and disease invasion in zebrafish xenografts. Pharmacologic disruption of S1P1 T236 phosphorylation, using either a pan-AKT inhibitor (MK2206) or an S1P1 functional antagonist (FTY720, an FDA-approved drug for treating multiple sclerosis), suppresses TNBC cell migration in vitro and tumor invasion in vivo. Finally, we show that human TNBC cells with AKT activation and elevated phospho-S1P1 T236 are sensitive to FTY720-induced cytotoxic effects. These findings indicate that the AKT-enhanced phosphorylation of S1P1 T236 mediates much of the TNBC invasiveness, providing a potential biomarker to select TNBC patients for the clinical application of FTY720.
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影响因子:
3.2
作者:
Jin L;Liu WR;Tian MX;Fan J;Shi YH
通讯作者:
Shi YH
影响因子:
9.7
作者:
Li, Mei-Hong;Sanchez, Teresa;Yamase, Harold;Hla, Timothy;Oo, Myat Lin;Pappalardo, Anna;Lynch, Kevin R.;Lin, Chen-Yong;Ferrer, Fernando
通讯作者:
Ferrer, Fernando
DOI:
10.1038/labinvest.2013.7
发表时间:
2013-04
期刊:
Laboratory investigation; a journal of technical methods and pathology
影响因子:
--
作者:
通讯作者:
--
影响因子:
37.3
作者:
Fisher KE;Pop A;Koh W;Anthis NJ;Saunders WB;Davis GE
通讯作者:
Davis GE
影响因子:
10.2
作者:
Gong K;Jiao J;Xu C;Dong Y;Li D;He D;Zhao D;Yu J;Sun Y;Zhang W;Bai M;Duan Y
通讯作者:
Duan Y