Angiogenesis: quantitative assessment by the chick chorioallantoic membrane assay

Area of Science:

• Biomedical research
• Developmental biology
• Cancer research

Background:

• Angiogenesis, the formation of new blood vessels, is crucial in development and disease, particularly cancer.
• Quantitative assessment of angiogenesis is vital for studying angiogenic factors and developing anti-angiogenic therapies.
• The chick chorioallantoic membrane (CAM) assay is a widely used model for studying angiogenesis.

Purpose of the Study:

• To enhance the quantitative assessment of angiogenesis using the CAM assay.
• To develop a reproducible and precise method for measuring DNA synthesis as an indicator of angiogenesis.
• To evaluate the utility of the modified CAM assay in studying angiogenic stimulators and inhibitors.

Main Methods:

• Incorporation of [3H]thymidine (3H-T) into DNA was measured in CAM tissue.
• A simple DNA isolation procedure was employed to quantify radioactivity accurately.
• The assay was validated using tumor extracts, epidermal growth factor (EGF), and cytostatics.

Main Results:

• The modified CAM assay demonstrated reproducibility and adequate precision (10-20%).
• Tumor extracts and EGF stimulated DNA synthesis in CAM, indicating increased angiogenesis.
• Cytostatics inhibited DNA synthesis, confirming the assay's ability to detect anti-angiogenic effects.
• The angiogenic activity of human endometrial adenocarcinoma was successfully characterized.

Conclusions:

• The improved CAM assay provides a reliable method for quantitative assessment of angiogenesis.
• This assay facilitates the study of angiogenic factors and their role in diseases like cancer.
• The methodology can be applied to evaluate the angiogenic potential of various biological samples and therapeutic agents.