title: Enhanced hematopoietic activity of a human granulocyte/macrophage colony-stimulating factor-interleukin 3 fusion protein.
abstract: Granulocyte/macrophage colony-stimulating factor-interleukin 3 (GM-CSF-IL-3) fusion proteins were generated by construction of a plasmid in which the coding regions of human GM-CSF and IL-3 cDNAs were connected by a synthetic linker sequence followed by subsequent expression in yeast. Both GM-CSF-IL-3 and IL-3-GM-CSF fusion proteins were purified to homogeneity and shown to bind to cell-surface receptors through either their GM-CSF or IL-3 domains. The fusion proteins exhibited enhanced receptor affinity, proliferative activity, and hematopoietic colony-stimulating activity compared with either IL-3 and/or GM-CSF alone. This suggests that GM-CSF-IL-3 fusion proteins may hold future promise as therapeutic agents.
authors.affiliation: Immunex Research and Development Corporation, Seattle, WA 98101.
authors.forename: B M
authors.initials: BM
authors.lastname: Curtis
authors.forename: D E
authors.initials: DE
authors.lastname: Williams
authors.forename: H E
authors.initials: HE
authors.lastname: Broxmeyer
authors.forename: J
authors.initials: J
authors.lastname: Dunn
authors.forename: T
authors.initials: T
authors.lastname: Farrah
authors.forename: E
authors.initials: E
authors.lastname: Jeffery
authors.forename: W
authors.initials: W
authors.lastname: Clevenger
authors.forename: P
authors.initials: P
authors.lastname: deRoos
authors.forename: U
authors.initials: U
authors.lastname: Martin
authors.forename: D
authors.initials: D
authors.lastname: Friend
mesh_terms: D001483:Base Sequence; D001667:Binding, Competitive; D003001:Cloning, Molecular; D003114:Colony-Forming Units Assay; D004305:Dose-Response Relationship, Drug; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000008:administration & dosage* / Q000737:chemistry; D006410:Hematopoiesis / Q000187:drug effects*; D006801:Humans; D066298:In Vitro Techniques; D007377:Interleukin-3 / Q000008:administration & dosage* / Q000737:chemistry; D008969:Molecular Sequence Data; D009841:Oligonucleotides / Q000737:chemistry; D011487:Protein Conformation; D016187:Receptors, Granulocyte-Macrophage Colony-Stimulating Factor / Q000378:metabolism; D016185:Receptors, Interleukin-3 / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D007377:Interleukin-3; D009841:Oligonucleotides; D016187:Receptors, Granulocyte-Macrophage Colony-Stimulating Factor; D016185:Receptors, Interleukin-3; D011993:Recombinant Fusion Proteins; D016178:Granulocyte-Macrophage Colony-Stimulating Factor