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Postproduction Processing of Electrospun Fibres for Tissue Engineering
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Osteoblast function on electrically conductive electrospun PLA/MWCNTs nanofibers.

Shijun Shao1, Shaobing Zhou, Long Li

  • 1School of Life Science and Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, PR China.

Biomaterials
|February 5, 2011
PubMed
Summary

Researchers created conductive nanofibers from poly-DL-lactide and carbon nanotubes. Electrical stimulation significantly enhanced osteoblast growth, showing potential for bone tissue engineering applications.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Nanotechnology

Background:

  • Biodegradable polymers like poly-DL-lactide (PLA) are crucial for tissue engineering.
  • Incorporating conductive materials such as multiwalled carbon nanotubes (MWCNTs) can enhance cellular response.
  • Controlling nanofiber topography (random vs. aligned) influences cell behavior.

Purpose of the Study:

  • To fabricate electrically conductive PLA/MWCNT composite nanofibers.
  • To investigate the synergistic effects of topography and electrical stimulation on osteoblast outgrowth.
  • To explore the potential of these conductive scaffolds in bone tissue engineering.

Main Methods:

  • Electrospinning was used to create random and aligned PLA/MWCNT nanofibers.
  • Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) characterized nanofiber morphology and MWCNT dispersion.
  • In vitro degradation studies assessed changes in morphology, mass, molecular weight, and pH.
  • Osteoblast assays were performed with and without direct current (DC) stimulation.

Main Results:

  • PLA/MWCNT nanofibers with controlled orientation were successfully fabricated.
  • Aligned nanofibers provided better topographical cues for osteoblast extension compared to random fibers.
  • Electrical stimulation (100 μA DC) directed osteoblast growth along the current path.
  • Cellular elongation and proliferation were primarily driven by electrical stimulation, with topography playing a secondary role.

Conclusions:

  • Electrically conductive PLA/MWCNT nanofibers are promising for bone tissue engineering.
  • Electrical stimulation is a key factor in promoting osteoblast response on these scaffolds.
  • The combination of electrical cues and controlled topography offers significant potential for regenerative medicine applications.