Three-dimensional direct measurement of cardiomyocyte volume, nuclearity, and ploidy in thick histological sections

Area of Science:

• Cardiovascular Biology
• Cell Biology
• Histology

Background:

• Accurate measurement of cardiomyocyte volume, nuclearity, and ploidy is crucial for understanding myocardial development and disease.
• Existing methods for these measurements have limitations, including cell isolation or serial sectioning, which restrict the use of archived tissue and provide incomplete data.

Purpose of the Study:

• To develop and demonstrate a novel method for the direct, simultaneous measurement of cardiomyocyte volume, nuclearity, and ploidy in thick histological sections.
• To overcome the limitations of current techniques and enable the analysis of archived heart tissue.

Main Methods:

• A new staining and imaging protocol using Wheat Germ Agglutinin-Alexa Fluor 488 and DAPI on thick (40 μm) paraffin-embedded heart sections.
• Confocal microscopy and 3D image analysis software (Imaris) were employed to visualize and quantify cardiomyocyte parameters.
• Heart tissues from rat, mouse, rabbit, and sheep across different life stages were analyzed.

Main Results:

• The method successfully enabled simultaneous measurement of cardiomyocyte volume, nuclearity, and ploidy in thick sections.
• Direct 3D visualization of entire cardiomyocytes was achieved, eliminating the need for serial section alignment.
• The technique proved effective across multiple species and life stages.

Conclusions:

• This novel, time-efficient method allows for accurate morphometric measurements of cardiomyocytes in thick histological sections.
• The technique unlocks the potential of archived tissue for quantitative analysis of cardiomyocyte parameters.
• This approach provides a more complete picture of cardiomyocyte structure and ploidy compared to traditional methods.