title: High-level expression of functional platelet-activating factor receptors on a human B lymphoblastoid cell line.
abstract: Binding of platelet-activating factor (PAF) was characterized in a human b lymphoblastoid cell line, ASK.0. [3H]PAF binding to these cells was time-dependent, reaching equilibrium at 60 minutes, and saturable. Scatchard analyses of saturation binding experiments revealed a single class of PAF binding sites (108,000 +/- 17,000 per cell) with a KD of 2.16 +/- 0.41 nM. That the binding sites were specific for PAF was demonstrated by competition studies. PAF was shown to increase the intracellular calcium concentrations of ASK.0 cells in a dose-dependent manner with an EC50 of 7 nM. We have, therefore, identified a B cell line expressing large numbers of functional PAF receptors.
authors.affiliation: Department of Pediatrics, Baylor College of Medicine, Houston, Texas.
authors.forename: A
authors.initials: A
authors.lastname: Kuruvilla
authors.forename: G
authors.initials: G
authors.lastname: Putcha
authors.forename: W T
authors.initials: WT
authors.lastname: Shearer
mesh_terms: D001402:B-Lymphocytes; D001667:Binding, Competitive; D002118:Calcium / Q000378:metabolism; D002460:Cell Line; D003600:Cytosol / Q000378:metabolism; D006801:Humans; D007700:Kinetics; D010972:Platelet Activating Factor / Q000378:metabolism* / Q000494:pharmacology; D010980:Platelet Membrane Glycoproteins; D011956:Receptors, Cell Surface / Q000378:metabolism*; D043562:Receptors, G-Protein-Coupled
chemical_list: D010972:Platelet Activating Factor; D010980:Platelet Membrane Glycoproteins; D011956:Receptors, Cell Surface; D043562:Receptors, G-Protein-Coupled; C039351:platelet activating factor receptor; D002118:Calcium