Engineering in-vitro stem cell-based vascularized bone models for drug screening and predictive toxicology

Area of Science:

• Biomedical Engineering
• Tissue Engineering
• Regenerative Medicine

Background:

• In-vitro bone models are vital for understanding bone biology and disease pathogenesis.
• Dysregulated vasculature-bone cell interactions are implicated in bone pathologies like osteoporosis.
• Limitations of animal models necessitate advanced human stem cell-based preclinical models.

Purpose of the Study:

• To review current models and approaches for generating in-vitro stem cell-based vascularized bone.
• To emphasize the challenges in engineering vasculature within bone tissue models.
• To explore strategies for creating functional vascular networks in engineered bone.

Main Methods:

• Review of experimental approaches including angiogenic factors, 3D scaffolds, prevascularization, and co-culture systems.
• Analysis of biomaterials, scaffold fabrication, cell choices, and culture conditions.
• Focus on dynamic culture systems and bioreactor applications for vascularized bone engineering.

Main Results:

• Various methods exist for creating stem cell-based vascularized bone models.
• Significant challenges remain in achieving functional and stable vasculature.
• Synergistic interactions between osteogenic and endothelial precursors are key.

Conclusions:

• Developing in-vitro vascularized bone models is critical for advancing bone research and therapeutics.
• Overcoming challenges in vasculature engineering is essential for model efficacy.
• Future research should focus on optimizing biomaterials, cell sourcing, and dynamic culture techniques.