Serum-Free Mouse Aortic Ring Assay of Angiogenesis

Area of Science:

• Vascular Biology
• Cell Culture Techniques
• Angiogenesis Research

Background:

• Serum-free cultures enhance visualization of angiogenic neovessels by minimizing fibroblast outgrowth.
• Standard serum-free methods for rat aortic rings are ineffective for mouse aortic rings due to their smaller size.
• Endogenous factors in serum-free media can stimulate angiogenesis, but require optimization for mouse models.

Purpose of the Study:

• To develop and validate a miniaturized serum-free culture method for mouse aortic rings.
• To enable spontaneous angiogenic sprouting from mouse aortic explants without exogenous growth factors.
• To facilitate the study of angiogenic regulators and responses in genetically modified mouse models.

Main Methods:

• Miniaturization of the serum-free aortic ring assay by reducing culture medium volume.
• Embedding mouse aortic rings in thin collagen gels.
• Culturing explants in a significantly reduced volume (1/10th) of serum-free medium compared to rat assays.

Main Results:

• Mouse aortic rings cultured using the miniaturized serum-free method spontaneously exhibited angiogenic sprouting.
• The sprouts were characterized as pericyte-coated endothelial vessels.
• The assay demonstrated responsiveness to exogenous angiogenic factors, confirming its utility.

Conclusions:

• The miniaturized serum-free mouse aortic ring assay is effective for studying angiogenesis.
• This method overcomes limitations of previous techniques, enabling spontaneous sprouting and evaluation of angiogenic regulators.
• It provides a valuable tool for investigating vascular biology in genetically modified mice.