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Acellular scaffold implantation--no alternative to tissue engineering.
T Walles1, C Puschmann, A Haverich
1Division of Thoracic and Cardiovascular Surgery, Hannover Medical School, Hannover, Germany.
The International Journal of Artificial Organs
|April 22, 2003
Summary
Acellular scaffolds degrade like current bioprostheses, while cellular scaffolds show potential as viable clinical alternatives for cardiovascular implants. This study compared degradation mechanisms in vivo.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Regenerative Medicine
Background:
- Cardiovascular bioprostheses degradation impacts bioartificial implant performance.
- Understanding scaffold fate is crucial for developing effective regenerative therapies.
Purpose of the Study:
- To investigate the in vivo degradation mechanisms of acellular and cellular cardiovascular scaffolds.
- To compare the host response and tissue integration of ovine carotid artery and aorta scaffolds.
Main Methods:
- Implantation of decellularized or native ovine carotid artery (CA) and aorta (AO) scaffolds in a rat subcutaneous model for 2, 4, and 8 weeks.
- Immunohistochemical analysis (desmin-vimentin, CD31, CD4, CD18) for cell repopulation, myocyte presence, endothelium, and inflammatory infiltration.
- Von Kossa staining for calcification and DNA isolation for cell density quantification.
Main Results:
- Acellular scaffolds (AO and CA) exhibited progressive calcification.
- Cellular scaffolds induced an initial inflammatory response that resolved within two weeks.
- Carotid artery scaffolds showed progressive revascularization, while aorta biocomposites degenerated; calcification was reduced in cellular scaffolds, particularly CA.
Conclusions:
- Acellular bioartificial implants share degradation pathways with current cardiovascular bioprostheses.
- Cellularized, viable implants represent promising alternatives for clinical applications in cardiovascular tissue engineering.