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Extremely low frequency electromagnetic fields promote mesenchymal stem cell migration by increasing intracellular Ca2+ and activating the FAK/Rho GTPases signaling pathways in vitro

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单位: [1]Huazhong Univ Sci & Technol,Tongji Med Coll,Tongji Hosp,Dept Orthoped,Jiefang Ave 1095,Wuhan 430030,Hubei,Peoples R China
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关键词: Electromagnetic fields Cell migration Intracellular Ca2+ Focal adhesion kinase Rho GTPase protein family

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Background: The ability of mesenchymal stem cells (MSCs) to migrate to the desired tissues or lesions is crucial for stem cell-based regenerative medicine and tissue engineering. Optimal therapeutics for promoting MSC migration are expected to become an effective means for tissue regeneration. Electromagnetic fields (EMF), as a noninvasive therapy, can cause a lot of biological changes in MSCs. However, whether EMF can promote MSC migration has not yet been reported. Methods: We evaluated the effects of EMF on cell migration in human bone marrow-derived MSCs. With the use of Helmholtz coils and an EMF stimulator, 7.5, 15, 30, 50, and 70 Hz/1 mT EMF was generated. Additionally, we employed the L-type calcium channel blocker verapamil and the focal adhesion kinase (FAK) inhibitor PF-573228 to investigate the role of intracellular calcium content, cell adhesion proteins, and the Rho GTPase protein family (RhoA, Rac1, and Cdc42) in EMF-mediated MSC migration. Cell adhesion proteins (FAK, talin, and vinculin) were detected by Western blot analysis. The Rho GTPase protein family activities were assessed by G-LISA, and F-actin levels, which reflect actin cytoskeletal organization, were detected using immunofluorescence. Results: All the 7.5, 15, 30, 50, and 70 Hz/1 mT EMF promoted MSC migration. EMF increased MSC migration in an intracellular calcium-dependent manner. Notably, EMF-enhanced migration was mediated by FAK activation, which was critical for the formation of focal contacts, as evidenced by increased talin and vinculin expression. Moreover, RhoA, Rac1, and Cdc42 were activated by FAK to increase cytoskeletal organization, thus promoting cell contraction. Conclusions: EMF promoted MSC migration by increasing intracellular calcium and activating the FAK/Rho GTPase signaling pathways. This study provides insights into the mechanisms of MSC migration and will enable the rational design of targeted therapies to improve MSC engraftment.

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出版当年[2017]版:
大类 | 2 区 医学
小类 | 2 区 医学:研究与实验 3 区 细胞生物学
最新[2025]版:
大类 | 2 区 医学
小类 | 2 区 细胞与组织工程 2 区 细胞生物学 2 区 医学:研究与实验
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出版当年[2016]版:
Q1 MEDICINE, RESEARCH & EXPERIMENTAL Q2 CELL BIOLOGY
最新[2023]版:
Q1 CELL & TISSUE ENGINEERING Q1 CELL BIOLOGY Q1 MEDICINE, RESEARCH & EXPERIMENTAL

影响因子: 最新[2023版] 最新五年平均 出版当年[2016版] 出版当年五年平均 出版前一年[2015版] 出版后一年[2017版]

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第一作者单位: [1]Huazhong Univ Sci & Technol,Tongji Med Coll,Tongji Hosp,Dept Orthoped,Jiefang Ave 1095,Wuhan 430030,Hubei,Peoples R China
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