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Observations on the microvasculature of bone defects filled with biodegradable nanoparticulate hydroxyapatite

Paper ID Volume ID Publish Year Pages File Format Full-Text
9647 640 2008 9 PDF Available
Title
Observations on the microvasculature of bone defects filled with biodegradable nanoparticulate hydroxyapatite
Abstract

The microvascularization of metaphyseal bone defects filled with nanoparticulate, biodegradable hydroxyapatite biomaterial with and without platelet factors enrichment was investigated in a minipig model. Results from morphological analysis and PECAM-1 immunohistochemistry showed the formation of new blood vessels into the bone defects by sprouting and intussusception of pre-existing ones. However, no significant differences were observed in the microvascularization of the different biomaterials applied (pure versus platelet factors-enriched hydroxyapatite), concerning the number of vessels and their morphological structure at day 20 after operation. The appearance of VEGFR-2 positive endothelial progenitor cells in the connective tissue between hydroxyapatite particles was also found to be independent from platelet factors enrichment of the hydroxyapatite bone substitute. In both groups formation of lymphatic vessels was detected with a podoplanin antibody. No differences were noted between HA/PLF− and HA/PLF+ implants with respect to the podoplanin expression level, the staining pattern or number of lymphatic vessels. In conclusion, the present study demonstrates different mechanisms of blood and lymphatic vessel formation in hydroxyapatite implants in minipigs.

Keywords
Angiogenesis; Endothelial cell; Lymphatic vessel; Hydroxyapatite composite; Platelet; Animal model
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Observations on the microvasculature of bone defects filled with biodegradable nanoparticulate hydroxyapatite
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 29, Issues 24–25, August–September 2008, Pages 3429–3437
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us