title: Membrane and intracellular platelet-activating factor receptor expression in leukemic blasts of patients with acute myeloid and lymphoid leukemia.
abstract: Platelet-activating factor (PAF), a phospholipid mediator with a wide range of actions on mature leukocytes, acts through PAF-receptors (PAF-Rs) on the membranes of responsive cells. No results are available concerning the putative presence of PAF-Rs on leukemic blasts. Using multiparameter flow cytometry, we assessed intracellular and membrane PAF-Rs on blast cells of acute myeloid leukemic (AML) and acute lymphoid leukemic (ALL) patients. Membrane PAF-Rs were documented in 7/15 cases of ALL and 0/28 cases of AML. Putative intracellular PAF-Rs were found in blasts of 8/8 ALL and 13/13 AML patients. Vitamin D(3) and dimethyl sulfoxide that induced the expression of PAF-Rs on the membrane of the human promyelocytic leukemia cell line, HL60, failed to induce their expression on the membranes of CD34(+) AML blasts. The lack of membrane PAF-Rs on the membranes of AML blasts confirms that these receptors represent a marker of mature cells and that their membrane induction is a consequence of cell maturation and differentiation.
mesh_terms: D000208:Acute Disease; D000328:Adult; D000368:Aged; D015703:Antigens, CD / Q000276:immunology; D018952:Antigens, CD34 / Q000276:immunology; D015214:Antigens, Differentiation, Myelomonocytic / Q000276:immunology; D014408:Biomarkers, Tumor / Q000276:immunology / Q000378:metabolism; D002454:Cell Differentiation / Q000276:immunology; D002462:Cell Membrane / Q000276:immunology* / Q000378:metabolism; D005260:Female; D005434:Flow Cytometry; D006412:Hematopoietic Stem Cells / Q000276:immunology* / Q000378:metabolism; D006801:Humans; D007424:Intracellular Fluid / Q000276:immunology* / Q000378:metabolism; D007945:Leukemia, Lymphoid / Q000276:immunology* / Q000378:metabolism; D015470:Leukemia, Myeloid, Acute / Q000276:immunology* / Q000378:metabolism; D008213:Lymphocyte Activation / Q000276:immunology; D008297:Male; D010972:Platelet Activating Factor / Q000276:immunology* / Q000378:metabolism; D010980:Platelet Membrane Glycoproteins / Q000276:immunology* / Q000378:metabolism; D011956:Receptors, Cell Surface / Q000276:immunology* / Q000378:metabolism; D043562:Receptors, G-Protein-Coupled; D063268:Sialic Acid Binding Ig-like Lectin 3
chemical_list: D015703:Antigens, CD; D018952:Antigens, CD34; D015214:Antigens, Differentiation, Myelomonocytic; D014408:Biomarkers, Tumor; C571163:CD33 protein, human; D010972:Platelet Activating Factor; D010980:Platelet Membrane Glycoproteins; D011956:Receptors, Cell Surface; D043562:Receptors, G-Protein-Coupled; D063268:Sialic Acid Binding Ig-like Lectin 3; C039351:platelet activating factor receptor