Human cardiac telocytes: 3D imaging by FIB-SEM tomography

Area of Science:

• Cardiovascular Biology
• Cell Biology
• Microscopy and Imaging

Background:

• Telocytes (TCs) are a recently discovered cell type residing in the cardiac interstitium.
• Their three-dimensional (3D) morphology and spatial network remain largely uncharacterized.
• Understanding TC structure is vital for elucidating their role in cardiac intercellular signaling.

Purpose of the Study:

• To elucidate the complete three-dimensional (3D) ultrastructural anatomy of cardiac telocytes (TCs).
• To visualize the spatial network formed by TCs within the cardiac interstitium.

Main Methods:

• Utilized focused ion beam scanning electron microscopy (FIB-SEM) tomography.
• Performed 3D reconstruction of cardiac TCs to analyze their ultrastructure.

Main Results:

• Provided the first comprehensive 3D ultrastructural anatomy of cardiac TCs.
• Confirmed TCs possess long, narrow, flattened (ribbon-like) telopodes with podoms.
• Demonstrated the network formation of TCs in the cardiac interstitium via adherens junctions.

Conclusions:

• Cardiac TCs form an interconnected network within the cardiac interstitium.
• FIB-SEM tomography offers unprecedented insight into the 3D architecture of cardiac TCs.
• This study establishes a foundational understanding of cardiac TC morphology and spatial organization.