Double-Layer Nanofibrous Sponge Tube via Electrospun Fiber and Yarn for Promoting Urethral Regeneration

Insufficient bionic performance is a structural obstacle and makes urethral repair unobtainable. To overcome this challenge, we mimicked the urethral matrix and applied two electrospinning techniques to build a double-layer sponge tube of nanofibers and nanoyarns. Intriguingly, silk fibroin (SF) and vitamin B5 (VitB5) could be introduced to increase the elasticity of the outer layer and reduce the hydrophobicity to further improve mesenchymal cell proliferation. Systematic experiments validated the bionic structure, biocompatibility, and exosome delivery capacity in this scaffold. We achieved scarless urethral repair by delivering the bioactive growth factors from adipose-derived stem cell exosomes by physical absorption. Biological regeneration of the urethra can be accomplished with continuous epithelium in animals. Furthermore, bioinformatics studies revealed that the expression of cell proliferation and fibrotic genes (e.g., Wnt7a, cfa-miR-574) was responsible for the biological regeneration of the adipose-derived stem cells exosomes (ADSC-exos) by delivering poly l-lactide-co-caprolactone/SF/VitB5 bilayer sponge (PSVBS) via reduced fibrosis gene expression, as well as improved epithelial formation and blood vessel formation. Therefore, the PSVBS design appeared to be an instructive approach for urethral and other tubular organ regeneration.

Automated summary

To overcome the issue of insufficient bionic performance, researchers mimicked the urethral matrix and used two electrospinning techniques to create a double-layer sponge tube comprising nanofibers and nanoyarns. Scarless urethral repair was achieved by delivering bioactive growth factors from adipose-derived stem cell exosomes through physical absorption. This design proves to be instructive for the regeneration of not only the urethra but also other tubular organs.