title: Murine erythroleukaemia cells (Friend cells) possess high-affinity binding sites for erythropoietin.
abstract: Murine erythroleukaemia cells represent erythroid precursors blocked near the CFU-E or proerythroblast stage. In contrast to their non-leukaemic equivalents, neither their proliferation nor their differentiation seems to be affected by erythropoietin. However, we show in this paper that both uncommitted and committed, benzidine-positive, cells bind iodinated erythropoietin. The binding is of high affinity (Kd = 490 +/- 160 pM) and reversible with a half-life of the complex of 77 +/- 19 min. The number of binding sites is low (300-600 per cell). In contrast the haematopoietic non-erythroid cell lines HL 60 and L 1210 and the myeloid-erythroid human cell line K 562 do not exhibit specific binding. If these binding sites represent true hormone receptors, their presence on a permanent cell line should facilitate erythropoietin receptor purification.
authors.forename: P
authors.initials: P
authors.lastname: Mayeux
authors.forename: C
authors.initials: C
authors.lastname: Billat
authors.forename: R
authors.initials: R
authors.lastname: Jacquot
mesh_terms: D000818:Animals; D001665:Binding Sites; D002460:Cell Line; D004921:Erythropoietin / Q000378:metabolism*; D005622:Friend murine leukemia virus; D007700:Kinetics; D004915:Leukemia, Erythroblastic, Acute / Q000378:metabolism* / Q000473:pathology; D051379:Mice
chemical_list: D004921:Erythropoietin