“…Different subtypes of cardiomyocytes can be distinguished: sinoatrial nodal cells, atrioventricular nodal cells, atrial cells, ventricular cells, and Purkinje cells [ 49 ].Those cells act in concert with a vascular system and multiple non-myocyte cells. The non-myocyte cells in the myocardium, which thus represent 65 to 75% of the cells, comprise the following: - Endothelial cells , which border the myocardium capillaries [ 48 ] and are essential for cardiomyocyte survival and reorganization [ 50 ];
- Vascular smooth muscle cells and pericytes , which sustain the vascular network and control the vascular tone [ 51 ];
- Fibroblasts , which play a prominent role in the constitution of the supporting extracellular matrix and contribute to cardiomyocyte electrical coupling, conduction system insulation, vascular maintenance, and stress-sensing [ 52 , 53 ];
- Neurons , which convey autonomic control of cardiac function through a brain–heart axis [ 54 ];
- Immune cells , such as myeloid or lymphoid cells [ 55 , 56 ]; and
- Other rarer cells that can have key roles in the regulation of specific functions such as regeneration or fibrotic cardiac remodeling [ 57 ].
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