Bone Tissue Engineering and Drug Delivery Systems
Summary
Bone tissue engineering merges biomaterials science, cellular biology and biomechanics to regenerate or replace damaged bone. It involves designing scaffolds that mimic the extracellular matrix, delivering cells or bioactive signals and integrating constructs with host tissue. Drug delivery systems in this context aim to provide controlled, localised release of osteoinductive factors, antimicrobials or anti-resorptive agents, enhancing repair while minimising systemic side effects. Recent advances include incorporation of growth factors such as bone morphogenetic protein-2, bisphosphonates like alendronate and osteogenic ions into composite scaffolds or injectable hydrogels. These constructs are optimised for porosity, mechanical strength and degradation rate to support cellular infiltration, vascularisation and new bone formation. Techniques such as 3D bioprinting, self-assembly of nanocomposites and stimuli-responsive materials enable precise fabrication of complex geometries and on-demand drug release. Integration of immunomodulatory cues and in-depth understanding of cell–material interactions have further refined scaffold design, offering platforms that actively orchestrate tissue regeneration. Global efforts focus on translating these technologies into clinical practice for fracture repair, osteoporotic defects and critical-size bone voids, underlining their broad therapeutic potential.
Research from Nature Portfolio
Recent studies have demonstrated sequential delivery of bone morphogenetic protein-2 and alendronate from a collagen–hydroxyapatite matrix. In this system, an initial burst of the growth factor promotes early osteogenic differentiation, followed by sustained release of alendronate to inhibit bone resorption, yielding synergistic enhancement of bone regeneration in critical-sized defect models. Foundational work on calcium phosphate cements blended with biodegradable polymers and loaded with alendronate has shown controlled drug elution closely linked to material degradation. These composites maintain suitable setting times and compressive strength for clinical use and stimulate bone formation in osteoporotic animal models, offering a localised therapeutic strategy that mitigates systemic side effects.
Bone Tissue Engineering and Drug Delivery Systems publication trend
The graph below shows the total number of articles in bone tissue engineering and drug delivery systems across all publications each year (not limited to Nature Index journals).
Technical terms
Hydroxyapatite: A calcium phosphate mineral that constitutes the inorganic component of bone and serves as an osteoconductive scaffold material.
Scaffold: A three-dimensional support structure designed to facilitate cell adhesion, proliferation and tissue formation while permitting nutrient and waste exchange.
Bisphosphonate: A class of drugs with high affinity for bone mineral that inhibit osteoclast-mediated bone resorption.
Osteoinduction: The process by which bioactive signals stimulate progenitor cells to differentiate into osteoblasts.
Shear-thinning: A rheological property in which material viscosity decreases under shear stress, facilitating injection or extrusion during bioprinting.
Positive-feedback circuit: A mechanism where an initial bioactive stimulus enhances subsequent activation or release of therapeutic agents to amplify the regenerative response.
Osteogenesis: The formation of new bone tissue mediated by osteoblast cells.
References
- Chirality‐Induced Hydroxyapatite Manipulates Enantioselective Bone‐Implant Interactions Toward Ameliorative Osteoporotic Osseointegration. Advanced Science (2024).
- Alendronate releasing silk fibroin 3D bioprinted scaffolds for application in bone tissue engineering: Effects of alginate concentration on printability, mechanical properties and stability. Results in Engineering (2024).
- Adaptable Hydrogels Mediate Cofactor‐Assisted Activation of Biomarker‐Responsive Drug Delivery via Positive Feedback for Enhanced Tissue Regeneration. Advanced Science (2018).
- Sequential dual-drug delivery of BMP-2 and alendronate from hydroxyapatite-collagen scaffolds for enhanced bone regeneration. Scientific Reports (2021).
- Alendronate release from calcium phosphate cement for bone regeneration in osteoporotic conditions. Scientific Reports (2018).
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