期刊
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS
卷 105, 期 2, 页码 366-375出版社
WILEY
DOI: 10.1002/jbm.b.33561
关键词
3D-printing; scaffold; bone defects; dipyridamole; hydroxyapatite (HAVbeta-tri-calcium phosphate (beta-TCP)
资金
- National Institutes of Health [AR56672, AR54897, AR046121, RC1HL100815]
- NYU-HHC Clinical and Translational Science Institute [UL1TR000038]
- NYUCI Center Support Grant [9NIH/NCI 5 P30CA16087-310]
Bone defects resulting from trauma or infection need timely and effective treatments to restore damaged bone. Using specialized three-dimensional (3D) printing technology we have created custom 3D scaffolds of hydroxyapatite (HA)/betatri-calcium phosphate (beta-TCP) to promote bone repair. To further enhance bone regeneration we have coated the scaffolds with dipyridamole, an agent that increases local adenosine levels by blocking cellular uptake of adenosine. Nearly 15% HA:85% beta-TCP scaffolds were designed using Robocad software, fabricated using a 3D Robocasting system, and sintered at 1100 degrees C for 4 h. Scaffolds were coated with BMP-2 (200 ng mL(-1)), dypiridamole 100 mu M or saline and implanted in C57B6 and adenosine A2A receptor knockout (A2AKO) mice with 3 mm cranial critical bone defects for 2-8 weeks. Dipyridamole release from scaffold was assayed spectrophotometrically. MicroCT and histological analysis were performed. Micro-computed tomography (microCT) showed significant bone formation and remodeling in HA/beta-TCP-dipyridamole and HA/(mu-TCP-BMP-2 scaffolds when compared to scaffolds immersed in vehicle at 2, 4, and 8 weeks In 5 per group; p< 0.05, p< 0.05, and p< 0.01, respectively). Histological analysis showed increased bone formation and a trend toward increased remodeling in HA/beta-TCPdipyridamole and HA/beta-TCP-BMP-2 scaffolds. Coating scaffolds with dipyridamole did not enhance bone regeneration in A2AKO mice. In conclusion, scaffolds printed with HA/beta-TCP promote bone regeneration in critical bone defects and coating these scaffolds with agents that stimulate A2A receptors and growth factors can further enhance bone regeneration. These coated scaffolds may be very useful for treating critical bone defects due to trauma, infection or other causes. (C) 2015 Wiley Periodicals, Inc.
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