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Sustained release of sphingosine 1-phosphate for therapeutic arteriogenesis and bone tissue engineering

Paper ID Volume ID Publish Year Pages File Format Full-Text
9975 656 2008 9 PDF Available
Title
Sustained release of sphingosine 1-phosphate for therapeutic arteriogenesis and bone tissue engineering
Abstract

Sphingosine 1-phosphate (S1P) is a bioactive phospholipid that impacts migration, proliferation, and survival in diverse cell types, including endothelial cells, smooth muscle cells, and osteoblast-like cells. In this study, we investigated the effects of sustained release of S1P on microvascular remodeling and associated bone defect healing in vivo. The murine dorsal skinfold window chamber model was used to evaluate the structural remodeling response of the microvasculature. Our results demonstrated that 1:400 (w/w) loading and subsequent sustained release of S1P from poly(lactic-co-glycolic acid) (PLAGA) significantly enhanced lumenal diameter expansion of arterioles and venules after 3 and 7 days. Incorporation of 5-bromo-2-deoxyuridine (BrdU) at day 7 revealed significant increases in mural cell proliferation in response to S1P delivery. Additionally, three-dimensional (3D) scaffolds loaded with S1P (1:400) were implanted into critical-size rat calvarial defects, and healing of bony defects was assessed by radiograph X-ray, microcomputed tomography (μCT), and histology. Sustained release of S1P significantly increased the formation of new bone after 2 and 6 weeks of healing and histological results suggest increased numbers of blood vessels in the defect site. Taken together, these experiments support the use of S1P delivery for promoting microvessel diameter expansion and improving the healing outcomes of tissue-engineered therapies.

Keywords
Tissue engineering; Controlled drug release; Phospholipids; Drug delivery; Bone healing; Growth factors
First Page Preview
Sustained release of sphingosine 1-phosphate for therapeutic arteriogenesis and bone tissue engineering
Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 29, Issue 19, July 2008, Pages 2869–2877
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering