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Fibril-associated collagens are a type of collagens present in the extracellular matrix with interrupted triple helices or FACIT (Fibril-associated collagens interrupted triple-helices). FACIT help connect and attach the collagen fibrils with each other as well as with other proteins of the extracellular matrix.
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...
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Production of Nanofibrillar Patterned Collagen for Tissue Engineering
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Directing collagen fibers using counter-rotating cone extrusion.

Henk R Hoogenkamp1, Gert-Jan Bakker2, Louis Wolf2

  • 1Department of Biochemistry 280, RIMLS, Radboud University Medical Center, PO Box 9101, 6500 HB Nijmegen, Netherlands.

Acta Biomaterialia
|December 3, 2014
PubMed
Summary

This study introduces a novel rotational extrusion method to engineer tubular collagen constructs with controlled fiber alignment. This technology enables precise control over collagen anisotropy for advanced tissue engineering applications.

Keywords:
Collagen structureECMExtrusionImage analysisScaffold

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Area of Science:

  • Biomaterials Engineering
  • Tissue Engineering
  • Biophysics

Background:

  • Bio-inspired tissue engineering requires mimicking the extracellular matrix's anisotropic structure and mechanical properties.
  • Controlling the orientation of native insoluble collagen fibers is challenging but crucial for functional tissue equivalents.

Purpose of the Study:

  • To develop a method for engineering tubular collagen constructs with defined fiber anisotropy.
  • To investigate the relationship between extrusion parameters and collagen fiber alignment.
  • To assess the mechanical properties of the engineered collagen constructs.

Main Methods:

  • Utilized controlled counter-rotating cone extrusion technology with bovine skin collagen.
  • Analyzed collagen fiber orientation using second harmonic generation microscopy and quantitative image analysis.
  • Varied cone rotation speeds to influence shear forces and collagen alignment.

Main Results:

  • Successfully engineered tubular collagen constructs with oriented collagen fibers and bundles.
  • Demonstrated a correlation between shear forces during extrusion and the direction/extent of fiber alignment.
  • Observed a gradual change in fiber direction ( +50° to -40°) within the constructs.
  • Engineered constructs exhibited tunable elasticity (900-2000 kPa) and toughness (19-35 mJ) based on cone speeds.

Conclusions:

  • Rotational extrusion is an enabling technology for creating and controlling the anisotropic architecture of collagen constructs.
  • This method offers a pathway for fabricating tailored collagen scaffolds for tissue engineering and regenerative medicine.