title: Induction of 2'-5' oligoadenylate synthetase during interferon treatment of chronic myelogenous leukemia.
abstract: Activity of the interferon-induced enzyme 2'-5' oligoadenylate synthetase (2-5 OAS) was measured in peripheral blood mononuclear cells (PBMCs) and serum of patients with chronic phase Ph'-positive chronic myelogenous leukemia (CML) treated with interferon-alpha (IFN-alpha) (4 x 10(6) IU/m2) alone or in combination with 50 micrograms IFN-gamma. At the beginning of IFN therapy, marked elevation of 2-5 OAS titers was detected in PBMCs (pretreatment 0.03-1.62, median 0.2; during treatment 0.8-13.14, median 4.31; 22 patients studied) and in serum (pretreatment 21-156 pmol/dl, median 62; during treatment 532-1740 pmol/dl, median 800; eight patients studied). However, 2-5 OAS titers were not related to clinical outcome or IFN therapy and also during IFN resistance elevated 2-5 OAS activity in PBMCs (median 3.45; range 1.05-13.14; 11 patients studied) were detected. These data argue against direct involvement of the 2-5 OAS system in the therapeutic effect of IFN in CML. However, 2-5 OAS titers in PBMCs or serum appear to be a reliable control of biologically active IFN therapy.
authors.affiliation: Innere Klinik and Poliklinik (Tumorforschung), Universitätsklinik, Essen, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Moritz
authors.forename: B
authors.initials: B
authors.lastname: Weissmann
authors.forename: B
authors.initials: B
authors.lastname: Grünewald
authors.forename: H
authors.initials: H
authors.lastname: Hust
authors.forename: G
authors.initials: G
authors.lastname: Kummer
authors.forename: N
authors.initials: N
authors.lastname: Niederle
mesh_terms: D015088:2',5'-Oligoadenylate Synthetase / Q000097:blood*; D000328:Adult; D000368:Aged; D004790:Enzyme Induction; D005260:Female; D006801:Humans; D000077190:Interferon alpha-2; D016898:Interferon-alpha / Q000627:therapeutic use; D007371:Interferon-gamma / Q000627:therapeutic use; D007372:Interferons / Q000627:therapeutic use*; D007700:Kinetics; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000201:enzymology* / Q000628:therapy*; D007963:Leukocytes, Mononuclear / Q000276:immunology; D008297:Male; D008875:Middle Aged; D011994:Recombinant Proteins
chemical_list: D000077190:Interferon alpha-2; D016898:Interferon-alpha; D011994:Recombinant Proteins; D007371:Interferon-gamma; D007372:Interferons; D015088:2',5'-Oligoadenylate Synthetase