title: Purification and growth of endothelial progenitor cells from murine bone marrow mononuclear cells.
abstract: This study reports the culture and purification of murine bone marrow endothelial progenitor cells (EPCs) using endothelial cell-conditioned medium (EC-CM). Endothelial-like cells appeared at day 5 in culture of bone marrow mononuclear cells in the presence of EC-CM in the culture system, and these cells incorporated acetylated low-density lipoproteins (Ac-LDL) and reacted with endothelial-specific Ulex Europaeus Lectin. Continued incubation of these cells at low density with EC-CM for longer than 10 days resulted in the formation of endothelial cell colonies which gave rise to colonies of endothelial progeny and can be passed for many generations in the EC-CM culture system. Cells derived from these colonies expressed endothelial cell markers such as vWF and CD31, incorporated Dil-Ac-LDL, stained positive for Ulex Europaeus Lectin, formed capillary-like structures on Matrigel, and demonstrated a high proliferative capacity in culture. These bone marrow-derived adherent cells were identified as EPCs. The purification and the formation of EPC colonies by using EC-CM were associated with the cytokines secreted in the EC-CM. VEGF, bFGF, and GM-CSF in the EC-CM stimulated the proliferation and growth of EPCs, whereas AcSDKP (tetrapeptide NAc-Ser-Asp-Lys-Pro) in EC-CM suppressed the growth of mesenchymal stem cells (MSC) and fibroblasts. This approach is efficient for isolation/purification and outgrowth of bone marrow EPCs in vitro, a very important cell source in angiogenic therapies and regenerative medicine.
authors.affiliation: Experimental Hematology Laboratory, Xiang Ya Medical College, Central South University, Changsha 410078, China. qirwang@yahoo.com
authors.forename: Qi Ru
authors.initials: QR
authors.lastname: Wang
authors.forename: Bao He
authors.initials: BH
authors.lastname: Wang
authors.forename: Yan Hong
authors.initials: YH
authors.lastname: Huang
authors.forename: Guo
authors.initials: G
authors.lastname: Dai
authors.forename: Wei Ming
authors.initials: WM
authors.lastname: Li
authors.forename: Qi
authors.initials: Q
authors.lastname: Yan
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells / Q000166:cytology*; D002448:Cell Adhesion; D049109:Cell Proliferation; D002469:Cell Separation / Q000379:methods*; D002478:Cells, Cultured; D017077:Culture Media, Conditioned; D042783:Endothelial Cells / Q000166:cytology*; D051379:Mice; D008807:Mice, Inbred BALB C; D013234:Stem Cells / Q000166:cytology*
chemical_list: D017077:Culture Media, Conditioned