Am J Physiol Cell Physiol AJP: Renal Physiology
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Am J Physiol Cell Physiol (March 27, 2002). doi:10.1152/ajpcell.00535.2001
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Articles in PresS, published online ahead of print March 27, 2002
Am J Physiol Cell Physiol, 10.1152/ajpcell.00535.2001
Submitted on November 13, 2001
Accepted on March 7, 2002

Quantification of cytoskeletal deformation in living cells based on hierarchical feature vector matching

Tammo Delhaas1*, Saskia van Engeland2, Jos Broers3, Carlijn Bouten2, Nico Kuijpers2, Frans Ramaekers4, and Luc H. E. H. Snoeckx5

1 Physiology, Maastricht University, Maastricht, The Netherlands; Pediatrics, Maastricht University, Maastricht, The Netherlands
2 Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands
3 Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands; Molecular Cell Biology, Maastricht University, Maastricht, The Netherlands
4 Molecular Cell Biology, Maastricht University, Maastricht, The Netherlands
5 Physiology, Maastricht University, Maastricht, The Netherlands; Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands

* To whom correspondence should be addressed. E-mail: t.delhaas{at}fys.unimaas.nl.

The cytoskeleton is a dynamic scaffold in living cells even in the absence of externally imposed forces. In this study on cytoskeletal deformation, the applicability of Hierarchical Feature Vector Matching (HFVM), a new matching method, currently applied in space research and 3D surface reconstruction, was investigated. Stably transfected CHO-K1 cells expressing green fluorescent protein (GFP) coupled to vimentin were used to visualize spontaneous movement of the vimentin cytoskeleton of individual cells using a confocal laser scanning system. It has been shown that with proper parameter and configuration settings, HFVM could recognize and trace 60% to 70% of all image points in artificially translated, rotated, or deformed images. If only points belonging to the cytoskeleton were selected for matching purposes, the percentage of matched points increased to 98%. This high percentage of recognition could be reached also in a time series of images, in which a certain degree of bleaching of the fluorescence over the recording time of 30 minutes was inevitable. In these images, HFVM allowed the detection as well as the quantification of spontaneous cytoskeletal movements of up to 10% of the cell width. Therefore, HFVM appears to be a reliable method to quantify dynamic cytoskeletal behavior in living cells.







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