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Structural changes in human type I collagen fibrils investigated by force spectroscopy
John S Graham1, Anthony N Vomund, Charlotte L Phillips
1Department of Physics and Astronomy, University of Missouri-Columbia, Columbia, MO 65211, USA.
Experimental Cell Research
|September 8, 2004
Summary
Newly assembled collagen fibrils exhibit significant elasticity, challenging previous assumptions of low extensibility. This elasticity is crucial for extracellular matrix remodeling during tissue development.
Area of Science:
- Biomechanics
- Biomaterials Science
- Cell Biology
Background:
- Collagen fibrils are key biomechanical components of tissues.
- Previous studies relied on indirect measurements of collagen fibril mechanics.
- A low extensibility was generally attributed to collagen fibrils.
Purpose of the Study:
- To directly measure the mechanical properties of single collagen fibrils.
- To investigate the extensibility and force-elongation profiles of collagen fibrils.
- To understand the role of collagen fibril elasticity in extracellular matrix remodeling.
Main Methods:
- Utilized atomic force microscopy (AFM)-based force spectroscopy (FS).
- Measured force-elongation and force-relaxation profiles of single, in vitro-assembled human type I collagen fibrils.
- Analyzed discontinuities and plateaus in force profiles.
Main Results:
- Single collagen fibrils demonstrated unexpectedly large extensibility.
- Force profiles revealed discontinuities and a plateau between 1.5- and 4.5-nN, indicating internal reorganization.
- Contrary to prior beliefs, collagen fibrils possess a significant elastic reserve.
Conclusions:
- Newly assembled collagen fibrils are more extensible than previously thought.
- The inherent elasticity of collagen fibrils may be vital for extracellular matrix remodeling.
- This elasticity is important for processes like tissue growth and morphogenesis.