A Novel Window into Angiogenesis-Intravital Microscopy in the AV-Loop-Model

Area of Science:

• Biomedical Engineering
• Regenerative Medicine
• Vascular Biology

Background:

• Current in vivo models have limitations in studying vascular development.
• Understanding vascularization is crucial for engineered tissue constructs.
• The arteriovenous (AV) loop model offers a platform for studying vascularization.

Purpose of the Study:

• To develop novel in vivo imaging chambers for live visualization of cellular processes.
• To enable detailed study of vascular development in the AV loop model.
• To overcome limitations of existing experimental designs.

Main Methods:

• Two types of intravital microscopy (IVM) chambers were designed and fabricated.
• Chambers were implanted in rats using different fixation methods (skin and subcutaneous).
• Modified gelatin hydrogel was used as a matrix, and fluorescent dyes were employed for visualization.

Main Results:

• Chamber A supported AV loop function for two weeks, enabling leukocyte trafficking visualization.
• Chamber B allowed examination of microvascular development in the AV loop for 21 days.
• Microvascular outgrowth was quantified using Fiji-ImageJ software.

Conclusions:

• The developed IVM chambers provide a unique tool for studying vascular development in the AV loop model.
• Combining both chamber types offers a comprehensive approach to understanding vascularization.
• This research advances the field of tissue engineering by improving in vivo study capabilities.