Blockade of Cripto binding to cell surface GRP78 inhibits oncogenic Cripto signaling via MAPK/PI3K and Smad2/3 pathways.
Blockade of Cripto binding to cell surface GRP78 inhibits oncogenic Cripto signaling via MAPK/PI3K and Smad2/3 pathways.
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DOI:
10.1038/onc.2009.97
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发表时间:
2009-06-18
期刊:
影响因子:
8
通讯作者:
Gray, P. C.
中科院分区:
文献类型:
--
作者:
Kelber, J. A.;Panopoulos, A. D.;Shani, G.;Booker, E. C.;Belmonte, J. C.;Vale, W. W.;Gray, P. C.
Cripto is a developmental oncoprotein that signals via MAPK/ERK, PI3K/Akt and Smad2/3 pathways. However, the molecular basis for Cripto coupling to these pathways during embryogenesis and tumorigenesis is not fully understood. In this regard, we recently demonstrated that Cripto forms a cell surface complex with the HSP70 family member glucose-regulated protein-78 (GRP78). Here, we provide novel functional evidence demonstrating that cell surface GRP78 is a necessary mediator of Cripto signaling in human tumor, mammary epithelial, and embryonic stem cells. We show that targeted disruption of the cell surface Cripto/GRP78 complex using shRNAs or GRP78 immunoneutralization precludes Cripto activation of MAPK/PI3K pathways and modulation of activin-A, activin-B, Nodal, and TGF-β1 signaling. We further demonstrate that blockade of Cripto binding to cell surface GRP78 prevents Cripto from increasing cellular proliferation, downregulating E-Cadherin, decreasing cell adhesion and promoting pro-proliferative responses to activin-A and Nodal. Thus, disrupting the Cripto/GRP78 binding interface blocks oncogenic Cripto signaling and may have important therapeutic value in the treatment of cancer.
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影响因子:
11.2
作者:
Gonzalez-Gronow, Mario;Cuchacovich, Miguel;Pizzo, Salvatore V.
通讯作者:
Pizzo, Salvatore V.
影响因子:
5.3
作者:
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通讯作者:
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影响因子:
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作者:
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DOI:
10.1073/pnas.0807691105
发表时间:
2008-12-09
影响因子:
11.1
作者:
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通讯作者:
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影响因子:
4.8
作者:
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通讯作者:
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