Spatio-temporal release of NGF and GDNF from multi-layered nanofibrous bicomponent electrospun scaffolds

J Mater Sci Mater Med. 2018 Jun 28;29(7):102. doi: 10.1007/s10856-018-6105-x.

Abstract

Scaffolds capable of providing dual neurotrophic factor (NTF) delivery with different release kinetics, spatial delivery of NTFs at different loci and topographical guidance are promising for enhanced peripheral nerve regeneration. In this study, we have designed and fabricated multi-layered aligned-fiber scaffolds through combining emulsion electrospinning, sequential electrospinning and high-speed electrospinning (HS-ES) to modulate the release behavior of glial cell line-derived growth factor(GDNF) and nerve growth factor (NGF). GDNF and NGF were incorporated into poly(lactic-co-glycolic acid) (PLGA) fibers and poly(D,L-lactic acid) (PDLLA) fibers, respectively. Aligned fibers were obtained in each layer of multi-layered scaffolds and relatively thick tri-layered and tetra-layered scaffolds with controlled layer thickness were obtained. Their morphology, structure, properties, and the in vitro release of growth factors were examined. Dual and spatio-temporal release of GDNF and NGF with different release kinetics from multi-layered scaffolds was successfully demonstrated. High separation efficiency by PDLLA fibrous barrier layer for spatial neurotrophic factor delivery from both tri-layered scaffolds and tetra-layered scaffolds was achieved.

MeSH terms

  • Glial Cell Line-Derived Neurotrophic Factor / chemistry*
  • Humans
  • Lactic Acid / chemistry
  • Materials Testing
  • Microscopy, Electron, Scanning
  • Nanofibers / chemistry*
  • Nerve Growth Factor / chemistry*
  • Nerve Regeneration
  • Polyesters / chemistry
  • Polyglycolic Acid / chemistry
  • Polylactic Acid-Polyglycolic Acid Copolymer
  • Tensile Strength
  • Tissue Scaffolds / chemistry*
  • Wettability

Substances

  • GDNF protein, human
  • Glial Cell Line-Derived Neurotrophic Factor
  • NGF protein, human
  • Polyesters
  • Polylactic Acid-Polyglycolic Acid Copolymer
  • Polyglycolic Acid
  • Lactic Acid
  • poly(lactide)
  • Nerve Growth Factor