Simultaneous 3D Analysis of Cardiac Damage and Immune Response in Reperfused Acute Myocardial Infarction Using Light...

Area of Science:

• Cardiovascular Biology
• Immunology
• Biomedical Imaging

Background:

• Reperfused acute myocardial infarction (repAMI) involves complex cellular interactions driving tissue remodeling.
• Understanding the spatial distribution of damaged areas and immune cell infiltration is crucial for identifying therapeutic targets.

Purpose of the Study:

• To develop and validate a protocol for simultaneous 3D visualization and quantification of cardiac damage, area at risk (AAR), and immune cells post-repAMI.
• To enable spatial analysis of cellular interactions within the intact mouse heart.

Main Methods:

• Intravital antibody staining for CD31-negative (damaged) areas and Ly6G-positive (neutrophil) infiltration.
• Retrograde antibody perfusion for ex vivo AAR visualization.
• Non-toxic tissue clearing and light sheet fluorescence microscopy (LSFM) for 3D imaging.
• Post-processing with traditional histology and immunohistochemistry for multiplexed data acquisition.

Main Results:

• Simultaneous and automatable 3D visualization and quantification of cardiac damage, AAR, and neutrophil infiltration.
• Spatial analysis of immune cell infiltration and damaged areas in an intact repAMI mouse heart.
• Successful integration of LSFM with histology/immunohistochemistry for enhanced data robustness.

Conclusions:

• The described technique provides a powerful tool for studying cellular dynamics in repAMI.
• This method facilitates the identification of novel therapeutic targets by enabling detailed spatial analysis of the injured heart.
• Multiplexed imaging in the same sample strengthens data reliability for complex cardiac injuries.