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Scaffolds for tympanic membrane regeneration in rats
Yi Shen1, Sharon Leanne Redmond, Bing Mei Teh
1Ear Sciences Centre, School of Surgery, The University of Western Australia, Nedlands, Australia.
Tissue Engineering. Part A
|October 25, 2012
Summary
New silk fibroin and acellular collagen scaffolds significantly accelerate tympanic membrane (TM) regeneration and hearing recovery in rats compared to traditional grafts.
Area of Science:
- Biomaterials Science
- Otolaryngology
- Regenerative Medicine
Background:
- Tympanic membrane (TM) perforations cause hearing loss and middle ear infection risks.
- Myringoplasty is a common surgical repair for chronic TM perforations.
- Existing graft materials for TM regeneration have limitations.
Purpose of the Study:
- To evaluate silk fibroin scaffold (SFS) and acellular collagen type I/III scaffold (ACS) efficacy for TM regeneration.
- To compare SFS and ACS with paper patch and Gelfoam in an acute TM perforation rat model.
- To assess the impact of these scaffolds on TM morphology and hearing function.
Main Methods:
- On-lay myringoplasty implantation of SFS and ACS in a rat model.
- Scanning electron microscopy for scaffold surface morphology.
- Otoscopy, light microscopy, electron microscopy, and auditory brainstem responses for TM assessment.
Main Results:
- SFS and ACS significantly accelerated TM perforation closure and restored optimal TM thickness.
- Trilaminar morphology and organized collagen fibers were improved with SFS and ACS.
- SFS and ACS led to earlier hearing restoration, while paper patch and Gelfoam showed delayed healing and inflammation.
Conclusions:
- Silk fibroin scaffolds and acellular collagen scaffolds are superior to paper patch and Gelfoam for TM regeneration.
- SFS and ACS promote early TM healing and improved hearing outcomes.
- These novel scaffolds show potential as clinical substitutes for TM repair.
