title: Effects of human yolk sac endothelial cells on supporting expansion of hematopoietic stem/progenitor cells from cord blood.
abstract: In order to investigate the effects of human yolk sac-derived endothelial cells (hYSECs) on the expansion of human hematopoietic stem/progenitor cells (HS/PCs) from umbilical cord blood (UCB) in vitro, we purified hYSEC-like cells from 4-5 week human yolk sacs, which were morphologically similar to endothelial cells and expressed CD31, CD144 and vWF characteristics of endothelial cells. Then we isolated CD34(+) cells from UCB in culture under three different conditions: with hematopoietic cytokines (CKs), contact-coculture or noncontact-coculture with hYSECs supplemented with CKs, and found that the contact-coculture system had the strongest expansion efficiency in the total cells' (TCs) ability to form HPP-CFCs. Erythroid burst-forming units (BFU-E) increased 52.35-fold, 20.26-fold and 27.77-fold, respectively, compared with pre-expansion. We detected that the mRNA of Notch ligands such as Jagged1, Delta1 and Delta4 could express in hYSECs after contacted culture with UCB-CD34(+) cells but not the noncontacted cells by RT-PCR analysis. Therefore, we concluded that the contact-coculture system supplemented with CKs could support the expansion of UCB-HS/PCs in vitro, especially high potential proliferative colony-forming cells (HPP-CFC) and BFU-E, perhaps owing to Notch signal pathway.
authors.affiliation: National Stem Cells Engineering Research Center, Institute of Human Reproductive and Stem Cell Engineering, Central South University, Changsha City, Hunan 410078, China. liangshan8027@163.com <liangshan8027@163.com>
authors.forename: Liangshan
authors.initials: L
authors.lastname: Hu
authors.forename: Lamei
authors.initials: L
authors.lastname: Cheng
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Huiping
authors.initials: H
authors.lastname: Zhao
authors.forename: Huaxin
authors.initials: H
authors.lastname: Duan
authors.forename: Guangxiu
authors.initials: G
authors.lastname: Lu
mesh_terms: D018952:Antigens, CD34 / Q000276:immunology; D002469:Cell Separation; D002478:Cells, Cultured; D042783:Endothelial Cells / Q000166:cytology*; D015672:Erythroid Precursor Cells / Q000166:cytology*; D005312:Fetal Blood / Q000166:cytology*; D005434:Flow Cytometry; D005786:Gene Expression Regulation; D006801:Humans; D008024:Ligands; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051880:Receptors, Notch / Q000235:genetics; D015017:Yolk Sac / Q000166:cytology*
chemical_list: D018952:Antigens, CD34; D008024:Ligands; D012333:RNA, Messenger; D051880:Receptors, Notch