Vascularization Strategies in Bone Tissue Engineering

Effective bone repair depends on the rapid establishment of a functional blood supply alongside new bone formation. Vascularization strategies in tissue engineering have evolved to address the dual challenge of osteogenesis and angiogenesis by integrating biomaterial design, biochemical cues and cellular approaches. Scaffold architectures are tailored to mimic the native extracellular matrix, incorporating porosity gradients, bioactive ceramics and polymeric hydrogels to guide vessel ingrowth. Controlled release of angiogenic factors such as vascular endothelial growth factor (VEGF) and bone morphogenetic proteins (BMPs) augments microvascular network formation, while physical stimuli—including ultrasound-triggered gelation—enhance tissue penetration and in situ gel assembly. Cell-based tactics employ co-cultures of endothelial cells and osteoprogenitors or mesenchymal stem cells to pre-vascularize constructs prior to implantation, promoting vessel anastomosis and accelerating bone matrix deposition. Recent advances have also explored cell-free therapies using membrane-derived vesicles enriched in growth factors, which offer off-the-shelf convenience. Together, these strategies converge on a modular paradigm in which scaffold composition, growth-factor presentation and cellular interactions are orchestrated to recapitulate the coupled processes of vessel and bone formation. Translation of these methodologies promises to improve outcomes in large-volume defect repair, non-union fractures and load-bearing applications, with clear implications for orthopaedic and reconstructive surgery worldwide.

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Vascularization Strategies in Bone Tissue Engineering publication trend

The graph below shows the total number of articles in vascularization strategies in bone tissue engineering across all publications each year (not limited to Nature Index journals).

Technical terms

Angiogenesis: The formation of new blood vessels from pre-existing vasculature, essential for nutrient delivery and waste removal in regenerating bone.

Osteogenesis: The process of new bone formation, involving differentiation of osteoprogenitor cells and deposition of mineralised extracellular matrix.

Co-culture: The in vitro cultivation of two or more cell types together, enabling reciprocal signalling that mimics tissue development and fosters pre-vascularization.

Hydrogel: A water-swollen polymeric network used as a scaffold matrix, capable of encapsulating cells and growth factors and often responsive to physical stimuli for in situ gelation.

Scaffold: A three-dimensional biomaterial framework designed to support cell attachment, guide tissue formation and regulate the spatiotemporal release of bioactive molecules.

References

1. Cell membrane vesicles derived from hBMSCs and hUVECs enhance bone regeneration. Bone Research (2024).
2. Tissue‐Penetrating Ultrasound‐Triggered Hydrogel for Promoting Microvascular Network Reconstruction. Advanced Science (2024).
3. In vitro angiogenesis in response to biomaterial properties for bone tissue engineering: a review of the state of the art. Regenerative Biomaterials (2023).