title: SHB and angiogenic factors promote ES cell differentiation to insulin-producing cells.
abstract: The potential use of embryonic stem (ES) cells for cell therapy of diabetes requires improved methods for differentiation and isolation of insulin-producing beta-cells. The signal transduction protein SHB may be involved in both angiogenesis and beta-cell development. Here we show that cells expressing the pancreatic endodermal marker PDX-1 appear in the vicinity of vascular structures in ES cell-derived embryoid bodies (EBs) cultured in vitro. Moreover, overexpression of SHB as well as culture of EBs in presence of the angiogenic growth factors PDGF or VEGF enhanced the expression of PDX-1 and/or insulin mRNA. Finally, expression of GFP under control of the PDX-1 promoter in EBs allowed for the enrichment by FACS of cells expressing PDX-1, C-peptide, and insulin as determined by immunofluorescence. It is concluded that SHB and angiogenic factors promote the development of cells expressing PDX-1 and insulin in EBs and that such cells can be separated by FACS.
authors.affiliation: Department of Medical Cell Biology, Uppsala University, Biomedical Centre, P.O. Box 571, SE-751 23 Uppsala, Sweden. johan.saldeen@karolinska.se
authors.forename: Johan
authors.initials: J
authors.lastname: Saldeen
authors.forename: Vitezslav
authors.initials: V
authors.lastname: Kriz
authors.forename: Nina
authors.initials: N
authors.lastname: Agren
authors.forename: Michael
authors.initials: M
authors.lastname: Welsh
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000008:administration & dosage*; D042501:Angiogenic Proteins / Q000008:administration & dosage*; D018929:Cell Culture Techniques / Q000379:methods; D002454:Cell Differentiation / Q000187:drug effects; D002478:Cells, Cultured; D006801:Humans; D007328:Insulin / Q000378:metabolism*; D007515:Islets of Langerhans / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism*; D018919:Neovascularization, Physiologic / Q000187:drug effects / Q000502:physiology; D011518:Proto-Oncogene Proteins / Q000008:administration & dosage*; D013234:Stem Cells / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism*; D023822:Tissue Engineering / Q000379:methods
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D042501:Angiogenic Proteins; D007328:Insulin; D011518:Proto-Oncogene Proteins; C490081:SHB protein, human