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Quantitative in-vivo studies on angiogenesis in a rat sponge model
S P Andrade1, T P Fan, G P Lewis
1Department of Pharmacology, Hunterian Institute, Royal College of Surgeons of England, London, UK.
British Journal of Experimental Pathology
|December 1, 1987
Summary
This study introduces a novel method for measuring angiogenesis in rats using 133Xe-saline clearance in polyester sponges. This technique allows for objective, reproducible studies on blood vessel formation and control mechanisms.
Area of Science:
- Physiology
- Biomedical Engineering
- Vascular Biology
Background:
- Angiogenesis, the formation of new blood vessels, is crucial for development and disease.
- Quantitative in-vivo models are needed to study angiogenesis mechanisms.
- Existing methods may lack objectivity or reproducibility.
Purpose of the Study:
- To describe a new quantitative in-vivo method for studying angiogenesis.
- To assess the reliability and applicability of the described method.
- To investigate factors influencing neovascularization in a controlled model.
Main Methods:
- Subcutaneous implantation of sterile polyester sponges in rats.
- Measurement of blood flow using 133Xe-saline clearance in implants.
- Histological examination of sponge implants at fixed time intervals.
- Topical application of vasoactive substances and growth factors.
Main Results:
- The 133Xe clearance method reliably quantified neovascularization in sponge implants.
- Histology confirmed gradual infiltration of host blood vessels into sponges.
- New blood vessels responded to prostaglandin-E2 and noradrenaline.
- Endothelial cell growth supplement accelerated angiogenesis, while protamine delayed it.
Conclusions:
- The described method provides an objective, continuous, and reproducible means to study angiogenesis in vivo.
- This model facilitates research into the mechanisms controlling blood vessel formation.
- The findings highlight the potential for modulating angiogenesis with specific agents.