Cerium Oxide Nanoparticle Modified Scaffold Interface Enhances Vascularization of Bone Grafts by Activating Calcium Channel of Mesenchymal Stem Cells

ACS Applied Materials & Interfaces
Junyu XiangXiaochao Yang

Abstract

Insufficient blood perfusion is one of the critical problems that hamper the clinical application of tissue engineering bone (TEB). Current methods for improving blood vessel distribution in TEB mainly rely on delivering exogenous angiogenic factors to promote the proliferation, migration, differentiation, and vessel formation of endothelial cells (ECs) and/or endothelial progenitor cells (EPCs). However, obstacles including limited activity preservation, difficulty in controlled release, and high cost obstructed the practical application of this strategy. In this study, TEB scaffold were modified with cerium oxide nanoparticles (CNPs) and the effects of CNPs existed at the scaffold surface on the growth and paracrine behavior of mesenchymal stem cells (MSCs) were investigated. The CNPs could improve the proliferation and inhibit the apoptosis of MSCs. Meanwhile, the interaction between the cell membrane and the nanoparticle surface could activate the calcium channel of MSCs leading to the rise of intracellular free Ca(2+) level, which subsequently augments the stability of HIF-1α. These chain reactions finally resulted in high expression of angiogenic factor VEGF. The improved paracrine of VEGF could thereby promote the prolif...Continue Reading

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