title: Analysis of recombinant soluble mouse D-factor/LIF receptor.
abstract: The recombinant soluble mouse D-factor/LIF receptor (sD-factor-R) was expressed in COS-7 cells. Scatchard analysis of the bindings of mouse 125I-D-factor and human 125I-D-factor to the sD-factor-R indicated dissociation constants (Kd) of 12 and 0.267 nM, respectively, which were comparable to those of the binding protein in mouse serum. The apparent molecular masses of the sD-factor-R and human D-factor observed by gel filtration chromatography were 150 and 50 kDa, respectively. The size of the sD-factor-R.human D-factor complex was approximately 200 kDa, indicating that D-factor forms a 1:1 complex with the sD-factor-R. The sD-factor-R inhibited the induction of differentiation of mouse myeloid leukemic M1 cells by mouse D-factor by blocking the binding of this factor to the cells.
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D002850:Chromatography, Gel; D006131:Growth Inhibitors / Q000378:metabolism* / Q000494:pharmacology; D006801:Humans; D015850:Interleukin-6; D053605:Leukemia Inhibitory Factor; D053680:Leukemia Inhibitory Factor Receptor alpha Subunit; D008222:Lymphokines / Q000378:metabolism* / Q000494:pharmacology; D051379:Mice; D010587:Phagocytosis; D018121:Receptors, Cytokine / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D053606:Receptors, OSM-LIF; D011994:Recombinant Proteins / Q000378:metabolism; D012995:Solubility; D014407:Tumor Cells, Cultured
chemical_list: D006131:Growth Inhibitors; D015850:Interleukin-6; C507837:LIF protein, human; C507840:LIFR protein, human; D053605:Leukemia Inhibitory Factor; D053680:Leukemia Inhibitory Factor Receptor alpha Subunit; C507838:Lif protein, mouse; C507841:Lifr protein, mouse; D008222:Lymphokines; D018121:Receptors, Cytokine; D053606:Receptors, OSM-LIF; D011994:Recombinant Proteins