The tissue suspension was filtered with a 0.22 µm pore-size filter to obtain a monocellular cell suspension. Cells were plated into a 25 cm2 flask coated with bovine type I collagen (BD Biosciences, Milan, Italy) and cultured in endothelial proliferation medium, EndoPM, at 37 °C in 5% CO2 and 5% O2, according to published protocols [5 (link),21 (link),22 (link)], in order to isolate the endothelial cell population (ECs). The media was changed 1–2 times a week and passaged at a split ratio of 1:4 every 14 days [5 (link),9 (link)].
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