| Cell dynamic adhesion and elastic properties probed with cylindrical atomic force microscopy cantilever tips. | |
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MedLine Citation:
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PMID: 17891755 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Cell adhesion is required for essential biological functions such as migration, tissue formation and wound healing, and it is mediated by individual molecules that bind specifically to ligands on other cells or on the extracellular matrix. Atomic force microscopy (AFM) has been successfully used to measure cell adhesion at both single molecule and whole cell levels. However, the measurement of inherent cell adhesion properties requires a constant cell-probe contact area during indentation, a requirement which is not fulfilled in common pyramidal or spherical AFM tips. We developed a procedure using focused ion beam (FIB) technology by which we modified silicon pyramidal AFM cantilever tips to obtain flat-ended cylindrical tips with a constant and known area of contact. The tips were validated on elastic gels and living cells. Cylindrical tips showed a fairly linear force-indentation behaviour on both gels and cells for indentations >200 nm. Cylindrical tips coated with ligands were used to quantify inherent dynamic cell adhesion and elastic properties. Force, work of adhesion and elasticity showed a marked dynamic response. In contrast, the deformation applied to the cells before rupture was fairly constant within the probed dynamic range. Taken together, these results suggest that the dynamic adhesion strength is counterbalanced by the dynamic elastic response to keep a constant cell deformation regardless of the applied pulling rate. |
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Authors:
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Félix Rico; Pere Roca-Cusachs; Raimon Sunyer; Ramon Farré; Daniel Navajas |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Validation Studies |
Journal Detail:
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Title: Journal of molecular recognition : JMR Volume: 20 ISSN: 0952-3499 ISO Abbreviation: J. Mol. Recognit. Publication Date: 2007 Nov-Dec |
Date Detail:
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Created Date: 2007-12-20 Completed Date: 2008-05-07 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9004580 Medline TA: J Mol Recognit Country: England |
Other Details:
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Languages: eng Pagination: 459-66 Citation Subset: IM |
Copyright Information:
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Copyright (c) 2007 John Wiley & Sons, Ltd. |
Affiliation:
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Unitat de Biofísica i Bioenginyeria, Facultat de Medicina, Universitat de Barcelona-IDIBAPS, Barcelona, Spain. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Biomechanics Cell Adhesion / physiology Cells, Cultured Elastic Tissue / ultrastructure* Elasticity Humans Microscopy, Atomic Force / instrumentation*, methods* Sepharose / chemistry Surface Properties |
| Chemical | |
Reg. No./Substance:
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9012-36-6/Sepharose |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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