Abstract:
:Biomolecular signals within the native extracellular matrix are complex, with bioactive factors found in both soluble and sequestered states. In the design of biomaterials for tissue engineering applications it is increasingly clear that new approaches are required to locally tailor the biomolecular environment surrounding cells within the matrix. One area of particular focus is strategies to improve the speed or quality of vascular ingrowth and remodeling. While the addition of soluble vascular endothelial growth factor (VEGF) has been shown to improve vascular response, strategies to immobilize such signals within a biomaterial offer the opportunity to optimize efficiency and to explore spatially defined patterning of such signals. Here we describe the use of benzophenone (BP) photolithography to decorate three-dimensional collagen-glycosaminoglycan (CG) scaffolds with VEGF in a spatially defined manner. In this effort we demonstrate functional patterning of a known agonist of vascular remodeling and directly observe phenotypic effects induced by this immobilized cue. VEGF was successfully patterned in both stripes and square motifs across the scaffold with high specificity (on:off pattern signal). The depth of patterning was determined to extend up to 500 μm into the scaffold microstructure. Notably, photopatterned VEGF retained native functionality as it was shown to induce morphological changes in human umbilical vein cells indicative of early vasculogenesis. Immobilized VEGF led to greater cell infiltration into the scaffold and the formation of immature vascular network structures. Ultimately, these results suggest that BP-mediated photolithography is a facile method to spatially control the presentation of instructive biological cues to cells within CG scaffolds.
journal_name
Acta Biomaterjournal_title
Acta biomaterialiaauthors
Alsop AT,Pence JC,Weisgerber DW,Harley BAC,Bailey RCdoi
10.1016/j.actbio.2014.07.002subject
Has Abstractpub_date
2014-11-01 00:00:00pages
4715-4722issue
11eissn
1742-7061issn
1878-7568pii
S1742-7061(14)00296-7journal_volume
10pub_type
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