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A novel in vitro assay for human angiogenesis
K J Brown1, S F Maynes, A Bezos
1Division of Immunology and Cell Biology, John Curtin School of Medical Research, Australian National University, Canberra, Australia.
Summary
Researchers developed a new in vitro model for human angiogenesis using placental blood vessel fragments. This model effectively screens for compounds that enhance or inhibit new blood vessel formation, crucial for understanding diseases and healing.
Area of Science:
- Biomedical Engineering
- Vascular Biology
- Cell Biology
Background:
- Angiogenesis is vital for development and healing, but pathological in diseases like cancer and arthritis.
- Existing in vitro models lack physiological relevance for studying human angiogenesis.
- A need exists for a robust model to screen angiogenesis modulators.
Purpose of the Study:
- To establish a physiologically relevant in vitro model for human angiogenesis.
- To validate the model's efficacy in screening angiogenesis enhancers and inhibitors.
- To investigate the roles of key growth factors in the angiogenic process.
Main Methods:
- Culturing human placental blood vessel fragments in fibrin gel.
- Assessing microvessel network formation over 7–21 days.
- Utilizing RT-PCR to detect growth factor mRNA and neutralizing antibodies to assess factor roles.
- Testing known angiogenesis inhibitors (hydrocortisone, suramin) and enhancers.
Main Results:
- A spontaneous, complex microvessel network formed in vitro without exogenous growth factors.
- The model successfully identified inhibitors like hydrocortisone and suramin.
- RT-PCR confirmed the presence and role of acidic fibroblast growth factor (aFGF), basic fibroblast growth factor (bFGF), and vascular endothelial growth factor (VEGF).
- Neutralizing antibodies against aFGF, bFGF, and VEGF inhibited the angiogenic response.
Conclusions:
- A novel, physiologically relevant in vitro model for human angiogenesis was established using placental blood vessel fragments in fibrin gel.
- This model serves as an efficient platform for screening potential angiogenesis inhibitors and enhancers.
- Endogenous aFGF, bFGF, and VEGF play significant roles in mediating this angiogenic response.