期刊
BIOMATERIALS
卷 29, 期 10, 页码 1454-1463出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biomaterials.2007.11.041
关键词
arterial tissue engineering; scaffold; vascular grafts; animal model; xenotransplantation
资金
- NHLBI NIH HHS [P01-HL070295, K08 HL083980-02, P01 HL070295, KO8-HL083980, K08 HL083980] Funding Source: Medline
- NIAMS NIH HHS [P30 AR046032] Funding Source: Medline
- NIGMS NIH HHS [R0-1GM072194, R01 GM072194] Funding Source: Medline
The development of neotissue in tissue engineered vascular grafts remains poorly understood. Advances in mouse genetic models have been highly informative in the study of vascular biology, but have been inaccessible to vascular tissue engineers due to technical limitations on the use of mouse recipients. To this end, we have developed a method for constructing sub-1 mm internal diameter (ID) biodegradable scaffolds utilizing a dual cylinder chamber molding system and a hybrid polyester sealant scaled for use in a mouse model. Scaffolds constructed from either polyglycolic acid or poly-L-lactic acid nonwoven felts demonstrated sufficient porosity, biomechanical profile, and biocompatibility to function as vascular grafts. The scaffolds implanted as either inferior vena cava or aortic interposition grafts in SCID/bg mice demonstrated excellent patency without evidence of thromboembolic complications or aneurysm formation. A foreign body immune response was observed with marked macrophage infiltration and giant cell formation by post-operative week 3. Organized vascular neotissue, consisting of endothelialization, medial generation, and collagen deposition, was evident within the internal lumen of the scaffolds by post-operative week 6. These results present the ability to create sub-1 turn ID biodegradable tubular scaffolds that are functional as vascular grafts, and provide an experimental approach for the study of vascular tissue engineering using mouse models. (c) 2007 Elsevier Ltd. All rights reserved.
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