Fe₃O₄/BSA particles induce osteogenic differentiation of mesenchymal stem cells under static magnetic field

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• 作者：Pengfei Jiang ; Yixian Zhang ; Chaonan Zhu ; Wenjing Zhang ; Zhengwei Mao ; ^{zwmao@zju.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Changyou Gao ; ^{cygao@mail.hz.zj.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Magnetic particles ; Cellular uptake ; Magnetic field ; Cell differentiation ; Mesenchymal stem cell
• 刊名：Acta Biomaterialia
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：46
• 期：Complete
• 页码：141-150
• 全文大小：2114 K

文摘

Differentiation of stem cells is influenced by many factors, yet uptake of the magnetic particles with or without magnetic field is rarely tackled. In this study, iron oxide nanoparticles-loaded bovine serum albumin (BSA) (Fe₃O₄/BSA) particles were prepared, which showed a spherical morphology with a diameter below 200 nm, negatively charged surface, and tunable magnetic property. The particles could be internalized into bone marrow mesenchymal stem cells (MSCs), and their release from the cells was significantly retarded under external magnetic field, resulting in almost twice intracellular amount of the particles within 21 d compared to that of the magnetic field free control. Uptake of the Fe₃O₄/BSA particles enhanced significantly the osteogenic differentiation of MSCs under a static magnetic field, as evidenced by elevated alkaline phosphatase (ALP) activity, calcium deposition, and expressions of collagen type I and osteocalcin at both mRNA and protein levels. Therefore, uptake of the Fe₃O₄/BSA particles brings significant influence on the differentiation of MSCs under magnetic field, and thereby should be paid great attention for practical applications.

Statement of Significance

Differentiation of stem cells is influenced by many factors, yet uptake of the magnetic particles with or without magnetic field is rarely tackled. In this study, iron oxide nanoparticles-loaded bovine serum albumin (BSA) (Fe₃O₄/BSA) particles with a diameter below 200 nm, negatively charged surface, tunable Fe₃O₄ content and subsequently adjustable magnetic property were prepared. The particles could be internalized into bone marrow mesenchymal stem cells (MSCs), and their release from the cells was significantly retarded under external magnetic field. Uptake of the Fe₃O₄/BSA particles enhanced significantly the osteogenic differentiation of MSCs under a constant static magnetic field, while the magnetic particles and external magnetic field alone do not influence significantly the osteogenic differentiation potential of MSCs regardless of the uptake amount. The results demonstrate a potential magnetic manipulation method for stem cell differentiation, and also convey the significance of careful evaluation of the safety issue of magnetic particles in real an application situation.