title: Functional characteristics of in vivo induced neutrophils after differentiation therapy of acute promyelocytic leukemia with all-trans-retinoic acid.
abstract: The authors describe the functional capabilities of in vivo induced neutrophils from a patient with acute promyelocytic leukemia (French-American-British M3v) treated with differentiation therapy using all-trans-retinoic acid (45 mg.m-2.day-1). The induced neutrophils from the leukemic clone appeared in the blood 7 days after therapy. Normal neutrophils, presumably derived from nonclonal normal hematopoiesis, appeared 15 days after the initiation of therapy. The induced neutrophils were separated from normal neutrophils by density gradient centrifugation. Their origin was established by fluorescence in situ hybridization. The induced neutrophils were morphologically atypical but stained for myeloperoxidase (Sudan black B) and AS-D chloroacetate esterase and were negative for alpha-naphthyl butyrate esterase. Induced neutrophils were functionally mature, showing nitroblue tetrazolium reduction in 72% of the cells compared with 84% in the normal neutrophil fraction. Both the rate and total killing of Staphylococcus aureus (American Type Culture Collection Strain 25923) were normal in both neutrophil fractions. Random locomotion was equivalent and within the normal reference range in both fractions; however, using the under-agarose technique, induced neutrophils showed a minor chemotactic defect in response to both n-formyl-methionyl-leucyl-phenylalanine (score 292, normal 338-868) and complement-derived chemotactic factors (score 420, normal 457-1408). At autopsy, induced neutrophils infiltrated necrotic myocardial tissue, suggesting a normal response to inflammatory stimuli.
authors.affiliation: Department of Pathology, College of Medicine, University of Arizona, Tucson 85724.
authors.forename: L
authors.initials: L
authors.lastname: Glasser
authors.forename: R L
authors.initials: RL
authors.lastname: Fiederlein
authors.forename: G J
authors.initials: GJ
authors.lastname: Shamdas
authors.forename: A R
authors.initials: AR
authors.lastname: Brothman
mesh_terms: D000328:Adult; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use; D002634:Chemotaxis, Leukocyte / Q000187:drug effects / Q000502:physiology*; D003601:Cytotoxicity Tests, Immunologic; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D015473:Leukemia, Promyelocytic, Acute / Q000188:drug therapy* / Q000276:immunology* / Q000473:pathology; D008213:Lymphocyte Activation / Q000502:physiology; D008297:Male; D009504:Neutrophils / Q000187:drug effects / Q000502:physiology*; D014212:Tretinoin / Q000627:therapeutic use*
chemical_list: D014212:Tretinoin