This phenotypic sequence required endothelial-mural cell-cell contact, mural cell-derived VEGF and endothelial VEGFR2 signaling.
For instance, Amit Zeisel et al. [8] sequenced 3005 single-cells and revealed 9 major classes of cells (S1 and CA1 pyramidal neurons, interneurons, oligodendrocytes, astrocytes, microglia, vascular endothelial cells, mural cells and ependymal cells).
Blood vessels comprise endothelial cells, mural cells (pericytes/vascular smooth muscle cells) and basement membrane.
Angiogenesis is a complex process that includes the recruitment and proliferation of various cells, such as endothelial cells, mural cells [smooth muscle cells (SMC) and pericytes], endothelial progenitor cells (EPCs) and others.
They seem to have a differentiation potential toward endothelial cells, mural cells, adipocytes, and osteogenic cells [ 62, 127].
As in normal blood vessels, tumor vessels consist of endothelial cells, mural cells (pericytes and smooth muscle cells), and basement membrane (Baluk et al. 2003).
Although ectopic Cx43 expression does not increase basal GJ dye transfer between mural cells and endothelial cells, mural cells nucleofected with a wild-type Cx43 expression plasmid retain functional gap junctions with endothelial cells despite the presence of tumor media (Fig. 5a; Cx43 Mock vs. Cx43 231, p = 0.908, ns).
Finally, cardiac aging results in decreased mechanical and contractile efficiency, stiffening of myocardial cells, mural connective tissue and valves, decreased number of myocytes, increased myocyte size, increased rate of myocyte apoptosis, and blunted-adrenoceptor-mediated contractile and inotropic response [ 19].
Heterotypic cell-cell contact at interdigitations between endothelial cells and mural cells provides a unique presentation context for paracrine factors such as VEGF and angiopoietins that regulate endothelial cellular responses [4], [10], [12].
In 2006, iPSCs were produced from dermal fibroblasts [ 43] and iPS-derived Flk-1+ cells differentiate into endothelial cells and mural cells in vitro and were implemented in angiogenesis [ 44].
Consistent with its inability to release endothelial cells from mural cell inhibition, media from immortalized non-tumorigenic mammary epithelial cell line MCF10A did not alter Cx43 levels in vSMC after 24 h treatment (Fig. 3a).
