Abstract
Integrin β4 and its Y-1494 phosphorylation play an important role in cell signaling. We found a small molecule, ethyl1-(3-(4-chlorophenoxy)-2-hydroxypropyl)-3-(4-chlorophenyl)-1H-pyrazole-5-carboxylate (ECPC), that could elevate the levels of KIT ligand (KITLG), interleukin 8 (IL-8), prostaglandin-endoperoxide synthase 2 (PTGS2) and activating transcription factor 3 (ATF3) and promote apoptosis in vascular endothelial cells (VECs) through integrin β4. We investigated the underlying mechanism of integrin β4 participating in this process. ECPC treatment increased the phosphorylation of Y-1494 in the integrin β4 cytoplasmic domain via a well-known receptor tyrosine kinase, fibroblast growth factor receptor 1 (FGFR1), and integrin β4 translocated from the cytoplasm to nucleus. With suppression of Y-1494 phosphorylation by FGF-2 or siRNA of FGFR1, ECPC failed to promote integrin β4 nuclear translocation and could not increase the expression of KITLG, IL-8, PTGS2 or ATF3. Y-1494 phosphorylation and nuclear translocation of integrin β4 may be important during ECPC-induced apoptosis in VECs.
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Abbreviations
- ECPC:
-
Ethyl1-(3-(4-chlorophenoxy)-2-hydroxypropyl)-3-(4-chlorophenyl)-1H-pyrazole-5-carboxylate
- VEC:
-
Vascular endothelial cell
- HUVECs:
-
Human umbilical vein endothelial cells
- IL-8:
-
Interleukin 8
- RNAi:
-
RNA interference
- siRNA:
-
Small interfering RNA
- FBS:
-
Fetal bovine serum
- FGF-2:
-
Fibroblast growth factor-2
- FGFR1:
-
Fibroblast growth factor receptor 1
- RTK:
-
Receptor tyrosine kinase
- PTGS2:
-
Prostaglandin-endoperoxide synthase 2
- ATF3:
-
Activating transcription factor 3
- EGFR:
-
Epidermal growth factor receptor
- DMSO:
-
Dimethyl sulfoxide
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Acknowledgments
The work was supported in part by the National Natural Science Foundation of China (Nos. 90813022, 20972088, 31070735, 31000510 and 81021001), the National 973 Research Project (No. 2011CB503906), and the Natural Science Foundation of Shandong Province (ZR2010CZ004). We thank Dr. Laura Smales for the paper revising.
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Ge, D., Kong, X., Liu, W. et al. Phosphorylation and nuclear translocation of integrin β4 induced by a chemical small molecule contribute to apoptosis in vascular endothelial cells. Apoptosis 18, 1120–1131 (2013). https://doi.org/10.1007/s10495-013-0860-4
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DOI: https://doi.org/10.1007/s10495-013-0860-4