title: Expression of multiple heparin-binding growth factor species by murine embryonal carcinoma and embryonic stem cells.
abstract: Culture medium conditioned by P19 embryonal carcinoma (EC) cells contains potent mitogenic activity which is markedly potentiated when the medium is conditioned in the presence of heparin. Fractionation of P19 medium conditioned in the presence of heparin reveals the existence of two biochemically distinct growth factor species both of which exhibit high affinity for immobilised heparin and significant activity as amphibian mesoderm-inducing agents. One of the species is recovered as a single polypeptide of apparent Mr = 15,000. This molecule is immunologically related to the protein product of the human K-FGF proto-oncogene. Transcripts derived from the murine K-FGF gene are also expressed by both differentiated and undifferentiated EC cells and embryonic stem cells. The second heparin-binding growth factor is recovered as a complex of four polypeptides, the largest of which has an apparent Mr = 17,000. This agent is immunologically and biochemically distinct from both acidic and basic fibroblast growth factor as well as K-FGF, and represents the predominant mitogenic activity in EC-cell-conditioned medium.
authors.affiliation: Department of Biochemistry, University of Oxford, UK.
authors.forename: J K
authors.initials: JK
authors.lastname: Heath
authors.forename: G D
authors.initials: GD
authors.lastname: Paterno
authors.forename: A C
authors.initials: AC
authors.lastname: Lindon
authors.forename: D R
authors.initials: DR
authors.lastname: Edwards
mesh_terms: D000818:Animals; D002845:Chromatography; D054278:Embryonal Carcinoma Stem Cells; D005346:Fibroblast Growth Factors / Q000235:genetics; D015870:Gene Expression; D006133:Growth Substances / Q000032:analysis / Q000235:genetics*; D006493:Heparin / Q000032:analysis / Q000235:genetics*; D015151:Immunoblotting; D051379:Mice; D014411:Neoplastic Stem Cells / Q000378:metabolism*; D000090063:Proto-Oncogene Mas; D015183:Restriction Mapping
chemical_list: D006133:Growth Substances; C000715470:MAS1 protein, human; D000090063:Proto-Oncogene Mas; D005346:Fibroblast Growth Factors; D006493:Heparin