期刊
BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR BASIS OF DISEASE
卷 1864, 期 7, 页码 2395-2408出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bbadis.2018.04.019
关键词
Acidic pHe; Integrin beta 1; Cytoskeletal dynamics; Protrusion; FAK-Src signaling
资金
- National Natural Science Foundation of China [11772088, 31470906, 11502049, 31700811, 81471785, 31470959, 81671821]
- China Postdoctoral Science Foundation [2016M592657]
- Basic Research Program of Sichuan Science and Technology Foundation [2017JY0019, 2017JY0217]
- Fundamental Research Funds for the Central Universities [ZYGX2016Z001, ZYGX2015J143]
An acidic extracellular pH (pHe) in the tumor microenvironment has been suggested to facilitate tumor growth and metastasis. However, the molecular mechanisms by which tumor cells sense acidic signal to induce a transition to an aggressive phenotype remain elusive. Here, we showed that an acidic pHe (pH 6.5) stimulation resulted in protrusion and epithelial-mesenchymal transition (EMT) of cancer cells, which promoted migration and matrix degeneration. Using computational molecular dynamics simulations, we reported acidic pHe-induced opening of the Integrin dimers (alpha 5 beta 1) headpiece which indicated the activation of integrin. Moreover, acidic pHe promoted maturation of focal adhesions, temporal activation of Rho GTPases and microfilament reorganization through integrin beta 1-activated FAK signaling. Furthermore, mechanical balance of cytoskeleton (actin, tubulin and vimentin) contributed to acidic pHe-triggered protrusion and morphology change. Taken together, these findings revealed that integrin beta 1 could be a novel pH-regulated sensitive molecule which confers protrusion and malignant phenotype of cancer cells.
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