title: Augmentation of the activity of an immunotoxin, anti-Tac(Fv)-PE40KDEL, in T cell lines infected with human T cell leukemia virus type-I.
abstract: Therapy with an immunotoxin, anti-Tac(Fv)-PE38, which is a conjugate of the variable domains of an anti-Tac monoclonal antibody and Pseudomonas exotoxin, was reported to be useful for adult T cell leukemia (ATL) patients but a considerable amount of the immunotoxin is needed for the therapy and some side effects were also observed. We have previously demonstrated that an immunotoxin, anti-Tac(Fv)-PE40KDEL, showed strong cytotoxic effects on malignant cells from ATL patients. Therefore, we searched for agents that enhance the effects of the immunotoxin. PAK-200, FK-506, quinidine, cepharanthine and cyclosporine A (CsA) augmented the ability of the immunotoxin to inhibit protein synthesis in two human T cell leukemia virus type-I infected T cell lines, KUT-1 and KUT-2. CsA was the most potent agent in both the cell lines. Augmentation of the cytotoxic effect of the immunotoxin by these agents, especially CsA, may be useful in the immunotoxin therapy of ATL.
authors.affiliation: Department of Cancer Chemotherapy, Institute for Cancer Research, Kagoshima University, Japan.
authors.forename: Nobuhito
authors.initials: N
authors.lastname: Ohno
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Kreitman
authors.forename: Takeshi
authors.initials: T
authors.lastname: Saito
authors.forename: Izumi
authors.initials: I
authors.lastname: Masamoto
authors.forename: Kimiharu
authors.initials: K
authors.lastname: Uozumi
authors.forename: Shuichi
authors.initials: S
authors.lastname: Hanada
authors.forename: Shogo
authors.initials: S
authors.lastname: Takeuchi
authors.forename: Tatsuhiko
authors.initials: T
authors.lastname: Furukawa
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Sumizawa
authors.forename: Terukatsu
authors.initials: T
authors.lastname: Arima
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Akiyama
mesh_terms: D001426:Bacterial Proteins / Q000494:pharmacology*; D002460:Cell Line; D016572:Cyclosporine / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004357:Drug Synergism; D006801:Humans; D000922:Immunotoxins / Q000494:pharmacology*; D015375:Receptors, Interleukin-2 / Q000032:analysis; D011994:Recombinant Proteins / Q000494:pharmacology
chemical_list: D001426:Bacterial Proteins; D000922:Immunotoxins; D015375:Receptors, Interleukin-2; D011994:Recombinant Proteins; C111749:pseudomonas exoprotein A protein, Pseudomonas aeruginosa; D016572:Cyclosporine