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Tissue-Engineered Graft for Circumferential Esophageal Reconstruction in Rats
Published on: February 10, 2020
Engineering tissue tubes using novel multilayered scaffolds in the rat peritoneal cavity
Yang Cao1, Bing Zhang, Tristan Croll
1Tissue Engineering and Microfluidics Laboratory, Australian Institute for Bioengineering and Nanotechnology, University of Queensland, Brisbane, QLD 4072, Australia.
Journal of Biomedical Materials Research. Part A
|January 18, 2008
Summary
Researchers developed tubular poly(lactic acid) scaffolds for tissue engineering. Surface modifications with biomolecules did not fully overcome the foreign body response in rats.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Regenerative Medicine
Background:
- Developing functional tissue-engineered vascular grafts is crucial for cardiovascular repair.
- Small-diameter vascular grafts often face challenges like thrombosis and intimal hyperplasia.
- Poly(lactic acid) scaffolds offer a biodegradable and tunable platform for tissue regeneration.
Purpose of the Study:
- To engineer smooth muscle-like cell tissue tubes using novel poly(lactic acid) scaffolds.
- To evaluate the in vivo biocompatibility and cellular response of surface-modified scaffolds.
- To investigate the efficacy of various biomolecule coatings in modulating the foreign body response.
Main Methods:
- Fabrication of small-diameter tubular poly(lactic acid) scaffolds with interconnected pores via thermally induced phase separation.
- Surface modification of scaffolds using layer-by-layer deposition of biomolecules (Matrigel, elastin, collagen I, collagen III, chitosan).
- In vivo implantation of scaffolds in rat peritoneal cavities and subsequent histological analysis after 3 weeks.
Main Results:
- Fully-developed tissue capsules formed on scaffold outer surfaces; macrophage-like cells infiltrated internal spaces.
- Matrigel coating promoted the strongest cellular response.
- Coatings with elastin, collagen I, collagen III, or chitosan showed minimal cellular interaction.
- No biomolecule coating successfully mitigated the foreign body response in the peritoneal cavity.
Conclusions:
- Poly(lactic acid) scaffolds can support tissue capsule formation in vivo.
- Surface modification strategies using common biomolecules were insufficient to overcome the foreign body response.
- Further research is needed to develop effective strategies for vascular graft integration and long-term patency.
