Review Article

Role of the Vasa Vasorum and Vascular Resident Stem Cells in Atherosclerosis

Table 1

Resident progenitor cells within the vasculature.

LocationNameSelection methodMarkersCommentsReference

AdventitiaVascular progenitor cellsSca1 positive cells from cells outgrown from mouse thoracic aorta adventitiaSca1+Differentiate into SMCs, contributing to the formation of hyperplasia of ApoE-deficient atherosclerotic lesions Hu et al., 2004 [19]
Vascular progenitor cellsCD34+  CD31− cells from human adult saphenous vein CD34+
MSC- and NSC-like differentiation potential, but no endodermic differentiation was detected at the clonal level
Campagnolo et al., 2010 [20]
(Saphenous vein-derived progenitor cells; SVPs)After culture in the presence of serum, CD34 were subsided, and the following markers were increased:
(CD34+ cKit+ cells were located at perivascular sites of the vasa vasorum)CD29+, CD44+, CD105+, SOX2+, Nestin+, NG2+ (CD146−)Act as PCs, formed capillary structures (attached to EC-tubes), and improve ischemic hind limb through forming capillaries  
Adventitial stem cellsCD34+  CD146− cells from human stromal adipose tissue around vascular adventitiaCD34+ CD34+ CD146− cells display MSC-like features at the clonal level

  



Corselli et al., 2012 [21]
CD31−, CD146−, and CD45− 
These cells acquired a PCs-like phenotype (NG2+, CD146+, etc.) in the presence of angiopoietin 2
Adventitial pericyte progenitor cellsNG2+  CD146+cells from vascular adventitiaNG2+, CD146+, PDGFR+ MSC-like PCs contribute to restenosis following arterial injury Tigges et al., 2013 [22]
Some of these cells also express CD29+, CD90+ 
NG2/CD146+ cells were increased in the adventitia of the injured vasculature

Vasculogenic zone

Vascular wall resident EPCs
CD34+  CD105− cells from human internal thoracic arteryCD34+, KDR (VEGFR2)+, Tie2+
 Differentiate into mature ECs forming new vessels and hematopoietic cells including macrophages
Zengin et al., 2006 [23]
CD105−, CD144− 
(CD34+ cells located at the “vasculogenic zone")
Angiogenic MSCsAdherent culture condition (cells were isolated from human thoracic artery, and select the adherent cells forming colony )MSC markers (CD44+, CD90+, CD105+, etc.)Differentiate into ECs in the presence of VEGF, and form capillary-like structure
  



Pasquinelli et al., 2007 [24]
CD45−, CD146−, vWF− (These cells were heterogenous)
(CD34+ cKit+ cells were enriched in the vasculogenic zone)It is uncertain whether the isolated cells are equivalent of CD34− stained cells within thoracic aorta

MediaSide population-progenitor cellsSide population of cells from the tunica media of mouse aortaSca1+, cKit(dim), Differentiate into ECs and SMCs to form vascular-like branching structures on Matrigel

Sainz et al., 2006 [25]
CD34−, lineage negative(These cells were heterogenous)
Multipotent vascular stem cells (MVSCs)SM-MHC (smooth muscle myosin heavy chain)—negative cells from media of carotid artery of rats.SM-MHC(−), Sox1+, Nestin+ MSC- and NSC-like multipotency at the clonal level Tang et al., 2012 [26]
CD146−, CD34−, CD31− 
Differentiate into SMCs and chondrogenic cells, contributing to vascular remodeling and neointimal hyperplasia

EPCs: endothelial progenitor cells; MSCs: mesenchymal stem cells; NSCs: neuronal stem cells; ECs: endothelial cells; SMCs: smooth muscle cells; PCs: pericytes. Vasculogenic zone: the border between the media and adventitial layer.
Stem cell/hematopoietic markers: CD34, Sca1, and cKit.
MSC markers: CD29, CD44, CD90, and CD105.
EC markers: CD31, vWF, and VEGFR.