Journal
BIOPHYSICAL JOURNAL
Volume 98, Issue 12, Pages 3070-3077Publisher
CELL PRESS
DOI: 10.1016/j.bpj.2010.02.047
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Funding
- Canadian Foundation for Innovation
- Natural Sciences and Engineering Research Council of Canada
- Fonds Quebecois de la Recherche sur la Nature et les Technologies
- Ministere du Developpement Economique
- National Institutes of Health [AR36819]
- National Science Foundation [NIRT DMR-0403871]
- Nebraska Center for Materials and Nanoscience at the University of Nebraska-Lincoln
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The piezoelectric properties of single collagen type I fibrils in fascia were imaged with sub-20 nm spatial resolution using piezoresponse force microscopy. A detailed analysis of the piezoresponse force microscopy signal in controlled tip-fibril geometry revealed shear piezoelectricity parallel to the fibril axis. The direction of the displacement is preserved along the whole fiber length and is independent of the fiber conformation. It is shown that individual fibrils within bundles in skeletal muscle fascia can have opposite polar orientations and are organized into domains, i.e., groups of several fibers having the same polar orientation. We were also able to detect piezoelectric activity of collagen fibrils in the high-frequency range up to 200 kHz, suggesting that the mechanical response time of biomolecules to electrical stimuli can be similar to 5 mu s.
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