Endothelial cells, rather than fibroblasts, constitute the majority of noncardiomyocytes in the heart, suggesting a greater role in physiological function and injury response than previously appreciated.
This new perspective on the abundance of different cell types in the heart demonstrates that fibroblasts comprise a relatively minor population. By contrast, endothelial cells constitute the majority of noncardiomyocytes and are likely to play a greater role in physiological function and response to injury than previously appreciated.
Pinto et al. (2016) studied this question.