PMID:26476925

Citation	Yu, Y, Liang, Y, Liu, X, Yang, H, Su, Y, Xia, X and Wang, H' (2015) Id1 modulates endothelial progenitor cells function through relieving the E2-2-mediated repression of FGFR1 and VEGFR2 in vitro. Mol. Cell. Biochem. '
Abstract	The migration and proliferation of EPCs are crucial for re-endothelialization in vascular repair and development. Id1 has a regulatory role in the regulation of EPCs migration and proliferation. Based on these findings, we hypothesized that Id1 plays a regulatory role in modulating the migration and proliferation of EPCs by interaction with other factors. Herein, we report that the Id1 protein and E-box protein E2-2 regulate EPCs function with completely opposite effects. Id1 plays a positive role in the regulation of EPC proliferation and migration, while endogenous E2-2 appears to be a negative regulator. Immunoprecipitation and immunofluorescence assay revealed that the Id1 protein interacts and co-localizes with the E2-2 protein in EPCs. Further, endogenous E2-2 protein was found to block EPCs function via the inhibition of FGFR1 and VEGFR2 expression. The overexpression and silencing of Id1 have no direct regulatory role on VEGFR2 and FGFR1 expression. On the other hand, Id1 relieves the E2-2-mediated repression of FGFR1 and VEGFR2 expression to modulate EPCs proliferation, migration, and tube formation in vitro. In summary, we demonstrated that Id1 and E2-2 are critical regulators of EPCs function in vitro. Id1 interacts with E2-2 and relieves the E2-2-mediated repression of FGFR1 and VEGFR2 expression to modulate EPCs functions. Id1 and E2-2 may represent novel therapeutic targets for re-endothelialization in vascular damage and repair.
Links	PubMed Online version:10.1007/s11010-015-2591-z
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
HUMAN:ID1		GO:0001886: endothelial cell morphogenesis	ECO:0000314:		P		Figure 1. shows the effect of the Id1 protein on endothelial progenitor cells proliferation and migration using RT-PCR, Western blotting, and MTT assay.	complete CACAO 11140
HUMAN:ID1		GO:0010595: positive regulation of endothelial cell migration	ECO:0000315:		P		Figure 1 B, C, &D shows that when transfected with siRNA Id1 there was a "significant decrease in cell proliferation and migration compared with the control group" for EPCs.	complete CACAO 11186

References

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