Quantitative Assessment of Capillary Permeability in Deep Intracardiac Capillaries Using Fluorescent Dextran.

Area of Science:

• Cardiovascular Biology
• Microcirculation Research
• Biomedical Imaging

Background:

• Cardiac capillary dysfunction is linked to decreased cardiac function and increased disease risk.
• Existing methods lack the ability to evaluate material exchange in deep cardiac capillaries.
• Assessing capillary leakage is crucial for understanding heart health and disease progression.

Purpose of the Study:

• To develop a novel method for detecting and quantifying capillary permeability in deep cardiac tissue.
• To establish a quantitative index for evaluating the functional status of intracardiac microvessels.
• To provide new insights into factors affecting cardiac function decline and disease risk.

Main Methods:

• Administration of fluorescent dextran to mice via tail vein.
• Rapid processing of cardiac tissue followed by fluorescence imaging.
• Quantitative image analysis using LAS X and ImageJ to measure diffusion areas of leaked fluorescent material.

Main Results:

• Successfully detected leaking fluorescent material from intracardiac microvessels.
• Quantified capillary permeability by calculating the area of fluorescence diffusion.
• Established a novel index for assessing deep cardiac capillary leakage.

Conclusions:

• The developed method enables evaluation of capillary permeability deep within cardiac tissue.
• This technique offers a new perspective on cardiac homeostasis and disease mechanisms.
• Capillary-to-cell exchange, assessed by molecular diffusion, serves as a key indicator of tissue function.