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Injectable Hydrogel Guides Neurons Growth with Specific Directionality.

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International Journal of Molecular Sciences
|May 13, 2023
PubMed
Summary

Researchers developed an injectable hydrogel scaffold using cellulose nanofibers and polypeptides for neural tissue engineering. This novel material promotes neurite growth and neuronal signaling, offering potential for treating visual disabilities.

Keywords:
aligned structurecalcium imagingcellulose nanofiberhydrogelinjectableneuronpolypeptidethree-dimensional tomographytissue engineering

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Area of Science:

  • Biomaterials Science
  • Neuroscience
  • Tissue Engineering

Background:

  • Visual disabilities impact millions, with irreversible blindness affecting 43 million people.
  • The central nervous system, including the eye, has limited regenerative capacity.
  • Neural tissue engineering offers a promising therapeutic approach for vision restoration.

Purpose of the Study:

  • To develop an injectable, anisotropic hydrogel scaffold for neural tissue engineering.
  • To investigate the potential of cellulose nanofiber (CNF) and polypeptide (PLLGA) blends for supporting and stimulating neural regeneration.
  • To optimize scaffold composition for enhanced neurite growth and neuronal signaling.

Main Methods:

  • Co-injection of cellulose nanofiber (CNF) and poly (L-lysine)-r-poly(L-glutamic acid) (PLLGA) solutions to form an anisotropic hydrogel.
  • Characterization of hydrogel structure and anisotropy using 2D optical microscopy and 3D X-ray tomography.
  • Systematic investigation of blend ratios on cell viability, neurite growth, and calcium signaling.

Main Results:

  • CNF alignment under shear forces created an ordered hydrogel structure with mechanical strength.
  • The optimal PLLGA:CNF blend significantly enhanced directional neurite growth by 16% and achieved high anisotropy.
  • In vitro studies showed a 2.45-fold increase in calcium signaling compared to control.

Conclusions:

  • The developed anisotropic hydrogel scaffold is mechanically robust and supports neural regeneration.
  • The injectable nature and ability to stimulate neurite growth and signaling show high potential for neural tissue engineering applications.
  • This novel material and injection method represent a significant advancement in addressing irreversible blindness through regenerative medicine.