Promoting Cell Migration and Neurite Extension along Uniaxially Aligned Nanofibers with Biomacromolecular Particles...

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Cell Biology

Background:

• Developing advanced biomaterials is crucial for regenerative medicine.
• Controlling the spatial distribution of biomolecules on scaffolds influences cellular behavior.
• Existing methods for creating biomacromolecular gradients are often complex.

Purpose of the Study:

• To report a simple method for generating unidirectional and bidirectional density gradients of biomacromolecular particles on nanofibers.
• To demonstrate the applicability of this method to different biomacromolecules (collagen, collagen-fibronectin, collagen-laminin).
• To evaluate the impact of these gradients on cell migration and neurite extension.

Main Methods:

• Utilized masked electrospray for direct generation of density gradients.
• Fabricated scaffolds with uniaxially aligned nanofibers.
• Incorporated collagen, or mixtures of collagen with fibronectin or laminin, into particles.

Main Results:

• Successfully generated both unidirectional and bidirectional density gradients of biomacromolecular particles.
• Demonstrated that collagen gradients promote linear migration of bone marrow stem cells and NIH-3T3 fibroblasts.
• Showed that collagen-fibronectin gradients guide Schwann cell migration for nerve repair.
• Observed that collagen-laminin gradients enhance neurite extension from dorsal root ganglion neurons.

Conclusions:

• The reported masked electrospray method is effective for creating biomacromolecular density gradients on nanofiber scaffolds.
• These gradient scaffolds can modulate cell migration and neurite outgrowth in a controlled manner.
• The developed scaffolds hold significant potential for diverse biological studies and biomedical applications, including tissue regeneration and neural repair.