Abstract
Exposure to microgravity during space flight affects almost all human physiological systems. Migration, proliferation, and differentiation of stem cells are crucial for tissues repair and regeneration. However, the effect of microgravity on the migration potentials of bone marrow mesenchymal stem cells (BMSCs) is unclear, which are important progenitor and supporting cells. Here, we utilized a clinostat to model simulated microgravity (SMG) and found that SMG obviously inhibited migration of rat BMSCs. We detected significant reorganization of F-actin filaments and increased Young’s modulus of BMSCs after exposure to SMG. Moreover, Y-27632 (a specific inhibitor of ROCK) abrogated the inhibited migration capacity and polymerized F-actin filament of BMSCs under SMG. Interestingly, we found that transferring BMSCs to normal gravity also attenuated the polymerized F-actin filament and Young’s modulus of BMSCs induced by SMG, but could not recover migration capacity of BMSCs inhibited by SMG. Taken together, we propose that SMG inhibits migration of BMSCs through remodeling F-actin and increasing cell stiffness.
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Acknowledgments
We thank Prof. Long and Dr. Sun for crucial advice of the clinostat. This work was supported by Grants from the National Basic Research Program of China (2011CB710900), the Key Laboratory of Microgravity, Institute of Mechanics, Chinese Academy of Sciences (NML1516KFKT4-4), the National Natural Science Foundation of China (11272365, 11511140092, 11532004), the Fundamental Research Funds for the Central Universities (106112015CDJZR238807), the Research Fund for the Doctoral Program of Higher Education of China (20130191110029), and the Visiting Scholar Foundation of Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education (CQKLBST-2015-008).
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Mao, X., Chen, Z., Luo, Q. et al. Simulated microgravity inhibits the migration of mesenchymal stem cells by remodeling actin cytoskeleton and increasing cell stiffness. Cytotechnology 68, 2235–2243 (2016). https://doi.org/10.1007/s10616-016-0007-x
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DOI: https://doi.org/10.1007/s10616-016-0007-x