title: Interleukin-13 fusion cytotoxin as a potent targeted agent for AIDS-Kaposi's sarcoma xenograft.
abstract: Clinically advanced and rapidly progressive AIDS-associated Kaposi sarcoma (AIDS-KS) tumors require an aggressive tumor-directed therapy. We have observed that AIDS-KS cells express high levels of receptors for immune regulatory cytokine, interleukin-13 (IL-13). Two tumorigenic AIDS-KS cell lines, KS Y-1 and KS-imm, expressed 4560 and 9480 IL-13 binding sites per cell with an affinity (kd) of approximately 0.9 and 3.7 nmol/L, respectively. IL-13 cytotoxin IL13-PE38QQR, consisting of human IL-13 and a derivative of Pseudomonas exotoxin, is specifically cytotoxic to KS tumor cells. Systemic and loco regional administration of IL13-PE38QQR in immunodeficient mice with established human KS tumors produced remarkable antitumor activity. Three intratumoral (IT) injections of IL-13 toxin (250 microg/kg per dose) on alternate days (qod) or 5 daily (qd) IT injections with lower doses (50 or 100 microg/kg per dose) resulted in a complete regression of established subcutaneous tumors in most animals. Daily IT treatment with 250 microg/kg of IL-13 toxin in another KS-derived cell line also produced complete responses. Twice daily intraperitoneal injections of IL13-PE38QQR (25 or 50 microg/kg per dose) for 10 days (total injections = 20) also completely eradicated KS Y-1 tumors. Intravenous administration of IL13-PE38QQR also suppressed tumor growth; however, complete responses were not observed. All animals tolerated the therapeutic doses of IL-13 toxin without any visible signs of toxicity. The efficacy of receptor-directed IL13-PE38QQR therapy in mice warrants further exploration of this drug for AIDS-KS treatment.
authors.affiliation: Laboratory of Molecular Tumor Biology, Division of Cellular and Gene Therapies, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, MD 20892, USA.
authors.forename: S R
authors.initials: SR
authors.lastname: Husain
authors.forename: R K
authors.initials: RK
authors.lastname: Puri
mesh_terms: D036002:ADP Ribose Transferases; D000163:Acquired Immunodeficiency Syndrome; D000818:Animals; D001427:Bacterial Toxins; D004305:Dose-Response Relationship, Drug; D005098:Exotoxins / Q000008:administration & dosage / Q000493:pharmacokinetics / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D000922:Immunotoxins / Q000008:administration & dosage / Q000493:pharmacokinetics / Q000627:therapeutic use*; D007274:Injections, Intraperitoneal; D007275:Injections, Intravenous; D018793:Interleukin-13 / Q000627:therapeutic use*; D053661:Interleukin-13 Receptor alpha1 Subunit; D051379:Mice; D008819:Mice, Nude; D018123:Receptors, Interleukin / Q000187:drug effects / Q000378:metabolism; D053660:Receptors, Interleukin-13; D012514:Sarcoma, Kaposi / Q000188:drug therapy*; D014407:Tumor Cells, Cultured; D037521:Virulence Factors; D000097668:Pseudomonas aeruginosa Exotoxin A
chemical_list: D036002:ADP Ribose Transferases; D001427:Bacterial Toxins; D005098:Exotoxins; D000922:Immunotoxins; D018793:Interleukin-13; D053661:Interleukin-13 Receptor alpha1 Subunit; D018123:Receptors, Interleukin; D053660:Receptors, Interleukin-13; D037521:Virulence Factors; D000097668:Pseudomonas aeruginosa Exotoxin A; C508181:IL13RA1 protein, human; C508183:Il13ra1 protein, mouse