In this study we investigated the regulatory role of cell-migration-inducing and hyaluronan-binding protein (CEMIP) in the proliferation and migration of vascular smooth muscle cells (VSMCs). The mRNA and protein levels of CEMIP were upregulated in the plasma samples from patients with atherosclerosis, and in VSMCs stimulated with platelet-derived growth factor-BB (PDGF-BB), compared with plasma from healthy subjects and untreated VSMCs. Silencing CEMIP suppressed PDGF-BB-induced cell migration and proliferation in VSMCs, as determined using a Cell Counting Kit-8 assays, 5-ethynyl-2'-deocyuridine (EDU) assays, flow cytometry, wound healing assays, and Transwell assays. Overexpression of CEMIP promoted the proliferation and migration of VSMCs via activation of the Wnt-β-catenin signaling pathway and the upregulation of its target genes, including matrix metalloproteinase-2, matrix metalloproteinase-7, cyclin D1, and c-myc, whereas CEMIP deficiency showed the opposite effects. The knockdown of CEMIP in ApoE-/- mice by intravenous injection of lentiviral vector expressing si-CEMIP protected against high-fat-diet-induced atherosclerosis, as shown by the reduced aortic lesion areas, aortic sinus lesion areas, and the concentration of blood lipids compared with mice normally expressing CEMIP. These results demonstrated that CEMIP regulates the proliferation and migration of VSMCs in atherosclerosis by activating the WNT-β-catenin signaling pathway, which suggests the therapeutic potential of CEMIP for the management of atherosclerosis.
Keywords: CEMIP (cell migration-inducing and hyaluronan-binding protein); WNT–β-catenin signaling; atherosclerosis; athérosclérose; cell-migration-inducing and hyaluronan-binding protein (CEMIP); cellules musculaires lisses vasculaires (CMLV); facteur de croissance dérivé des plaquettes-BB (PDGF-BB); platelet-derived growth factor-BB (PDGF-BB); signalisation Wnt–β-caténine; vascular smooth muscle cells (VSMCs).