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critical adhesion areas of cells on micro-nanopatterns

Nano Research 2022年第2期15卷 1623-1635页

作者： Shuang Zheng Qiong Liu Junhao He Xinlei Wang Kai Ye Xuan Wang Ce Yan Peng Liu Jiandong Ding State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai 200438China Navy Characteristic Medical Center the Second Military Medical UniversityShanghai 200433China College of Bioengineering Chongqing UniversityChongqing 400044China

Cell adhesion to extracellular matrices(ECM)is critical to physiological and pathological processes as well as biomedical and biotechnological *** has been known that a cell can adhere on an adhesive microisland only over a critical *** no publication has concerned critical adhesion areas of cells on microislands with nanoarray ***,we fabricated a series of micro-nanopatterns with different microisland sizes and arginine-glycine-aspartate(RGD)nanospacings on a nonfouling poly(ethylene glycol)*** reproducing that nanospacing of RGD,a ligand of its receptor integrin(a membrane protein),significantly influences specific cell adhesion on bioactive nanoarrays,we confirmed that the concept of critical adhesion area originally suggested in studies of cells on micropatterns was justified also on the micro-nanopatterns,yet the latter exhibited more characteristic behaviors of cell *** found increased critical adhesion areas of human mesenchymal stem cells(hMSCs)on nanoarrayed microislands with increased RGD ***,the numbers of nanodots with respect to the critical adhesion areas were not a constant.A unified interpretation was then put forward after combining nonspecific background adhesion and specific cell *** further carried out the asymptotic analysis of a series of micro-nanopatterned surfaces to obtain the effective RGD nanospacing on unpatterned free surfaces with densely grafted RGD,which could be estimated nonzero but has never been revealed previously without the assistance of the micro-nanopatterning techniques and the corresponding analysis.

关键词： biomaterial surface patterning cell adhesion arginine-glycine-aspartate(RGD)nanospacing poly(ethylene glycol) critical adhesion area

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