title: Inhibitor of DNA binding 1 regulates cell cycle progression of endothelial progenitor cells through induction of Wnt2 expression.
abstract: Endothelial injury is a risk factor for atherosclerosis. Endothelial progenitor cell (EPC) proliferation contributes to vascular injury repair. Overexpression of inhibitor of DNA binding 1 (Id1) significantly promotes EPC proliferation; however, the underlying molecular mechanism remains to be fully elucidated. The present study investigated the role of Id1 in cell cycle regulation of EPCs, which is closely associated with proliferation. Overexpression of Id1 increased the proportion of EPCs in the S/G2M phase and significantly increased cyclin D1 expression levels, while knockdown of Id1 arrested the cell cycle progression of EPCs in the G1 phase and inhibited cyclin D1 expression levels. In addition, it was demonstrated that Id1 upregulated wingless‑type mouse mammary tumor virus integration site family member 2 (Wnt2) expression levels and promoted β‑catenin accumulation and nuclear translocation. Furthermore, Wnt2 knockdown counteracted the effects of Id1 on cell cycle progression of EPCs. In conclusion, the results of the present study indicate that Id1 promoted Wnt2 expression, which accelerated cell cycle progression from G1 to S phase. This suggests that Id1 may promote cell cycle progression of EPCs, and that Wnt2 may be important in Id1 regulation of the cell cycle of EPCs.
authors.affiliation: Postgraduate Department, Third Military Medical University, Chongqing 400038, P.R. China.
authors.forename: Xi
authors.initials: X
authors.lastname: Xia
authors.affiliation: Department of Cardiology, Institute of Cardiovascular Science of PLA, Xinqiao Hospital, Third Military Medical University, Chongqing 400038, P.R. China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Yu
authors.affiliation: Department of Geriatrics, Kunming General Hospital of Chengdu Military Area, Kunming, Yunnan 650032, P.R. China.
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Department of Geriatrics, Kunming General Hospital of Chengdu Military Area, Kunming, Yunnan 650032, P.R. China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Ma
authors.affiliation: Department of Geriatrics, Kunming General Hospital of Chengdu Military Area, Kunming, Yunnan 650032, P.R. China.
authors.forename: Hong
authors.initials: H
authors.lastname: Wang
mesh_terms: D000818:Animals; D059447:Cell Cycle Checkpoints; D019938:Cyclin D1 / Q000235:genetics; D066026:Endothelial Progenitor Cells / Q000378:metabolism* / Q000502:physiology; D005786:Gene Expression Regulation; D051798:Inhibitor of Differentiation Protein 1 / Q000502:physiology*; D008297:Male; D051379:Mice; D051154:Wnt2 Protein / Q000235:genetics*
chemical_list: C530105:Ccnd1 protein, mouse; D051798:Inhibitor of Differentiation Protein 1; D051154:Wnt2 Protein; D019938:Cyclin D1