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3D printed O2-generating scaffolds enhance osteoprogenitor- and type H vessel recruitment during bone healing.

Authors :
Sarkar, Naboneeta
Zhao, Jingtong
Zhang, Nicholas Y.
Horenberg, Allison L
Grayson, Warren L.
Source :
Acta Biomaterialia; Sep2024, Vol. 185, p126-143, 18p
Publication Year :
2024

Abstract

Oxygen (O 2)-delivering tissue substitutes have shown tremendous potential for enhancing tissue regeneration, maturation, and healing. As O 2 is both a metabolite and powerful signaling molecule, providing controlled delivery is crucial for optimizing its beneficial effects in the treatment of critical-sized injuries. Here, we report the design and fabrication of 3D-printed, biodegradable, O 2 -generating bone scaffold comprising calcium peroxide (CPO) that once hydrolytically activated, provides long-term generation of oxygen at a controlled, concentration-dependent manner, and polycaprolactone (PCL), a hydrophobic polymer that regulate the interaction of CPO with water, preventing burst release of O 2 at early time points. When anoxic conditions were simulated in vitro , CPO-PCL scaffolds maintained the survival and proliferation of human adipose-derived stem/stromal cells (hASCs) relative to PCL-only controls. We assessed the in vivo osteogenic efficacy of hASC-seeded CPO-PCL scaffolds implanted in a non-healing critical-sized 4-mm calvarial defects in nude mice for 8 weeks. Even without exogenous osteoinductive factors, CPO-PCL scaffolds demonstrated increased new bone volume compared to PCL-only scaffolds as verified by both microcomputed tomography analysis and histological assessments. Lastly, we employed a quantitative 3D lightsheet microscopy platform to determine that O 2 -generating scaffolds had similar vascular volumes with slightly higher presence of CD31<superscript>hi</superscript>Emcn<superscript>hi</superscript> pro-osteogenic, type H vessels and increased number of Osterix<superscript>+</superscript> skeletal progenitor cells relative to PCL-only scaffolds. In summary, 3D-printed O 2 generating CPO-PCL scaffolds with tunable O 2 release rates provide a facile, customizable strategy for effectively treating, craniofacial bone defects. Oxygen(O 2)-delivering bone substitutes show promise in defect repair applications by supplying O 2 to the cells within or around the graft, improving cell survivability and enhancing bone matrix mineralization. A novel O 2 -generating bone scaffold has been 3D printed for the first-time which ensures patient and defect specificity. 3D printed calcium peroxide-polycaprolactone (CPO-PCL) bone scaffold provides uninterrupted O 2 supply for 22 days allowing cell survival in deprived O 2 and nutrient conditions. For the first time, O 2 -driven bone regenerative environment in mice calvaria has been captured by light-sheet imaging which illuminates abundance of Osterix+ cells, angiogenesis at a single cell resolution indicating active site of bone remodeling and growth in the presence of O 2. [Display omitted] [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
17427061
Volume :
185
Database :
Supplemental Index
Journal :
Acta Biomaterialia
Publication Type :
Academic Journal
Accession number :
179465512
Full Text :
https://doi.org/10.1016/j.actbio.2024.07.011