title: Retroviral transfer of a chimeric multidrug resistance-adenosine deaminase gene.
abstract: A fusion between a selectable multidrug resistance (MDR1) cDNA and an adenosine deaminase (ADA) cDNA concomitantly confers multidrug resistance and ADA activity on transfected cells. We have produced a Harvey murine sarcoma virus-derived, replication-defective, recombinant retrovirus to transduce this chimeric MDR-ADA gene efficiently into a great variety of cells. Infection with the MDR-ADA retrovirus conferred the multidrug resistance phenotype on drug-sensitive cells, therefore allowing selection in the presence of colchicine. Colchicine-resistant cells synthesized large amounts of a membrane-associated 210-kDa MDR-ADA fusion protein that preserved both MDR and ADA functional activities. To monitor expression of the chimeric gene in vivo, Kirsten virus-transformed NIH cells were infected with the MDR-ADA retrovirus, and after drug-selection, injected into athymic nude mice. Tumors developed that contained the bifunctionally active MDR-ADA fusion protein. When these mouse tumor cells were placed in tissue culture without the selecting drug, they did not lose the bifunctionally active MDR-ADA fusion protein. The replication-defective, recombinant MDR-ADA retrovirus should be useful to stably introduce the chimeric MDR-ADA gene into a variety of cell types for biological experiments in vitro and in vivo.
authors.affiliation: Laboratory of Molecular Biology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892.
authors.forename: U A
authors.initials: UA
authors.lastname: Germann
authors.forename: K V
authors.initials: KV
authors.lastname: Chin
authors.forename: I
authors.initials: I
authors.lastname: Pastan
authors.forename: M M
authors.initials: MM
authors.lastname: Gottesman
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000243:Adenosine Deaminase / Q000172:deficiency / Q000235:genetics*; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002461:Cell Line, Transformed; D004351:Drug Resistance / Q000235:genetics*; D015316:Genetic Therapy / Q000379:methods; D005822:Genetic Vectors; D006251:Harvey murine sarcoma virus / Q000235:genetics*; D007153:Immunologic Deficiency Syndromes / Q000628:therapy; D007708:Kirsten murine sarcoma virus / Q000235:genetics; D008562:Membrane Glycoproteins / Q000235:genetics*; D051379:Mice; D008969:Molecular Sequence Data; D009700:Nucleoside Deaminases / Q000235:genetics*; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis / Q000235:genetics; D009053:Sarcoma Viruses, Murine / Q000235:genetics*; D012513:Sarcoma, Experimental / Q000235:genetics; D014407:Tumor Cells, Cultured
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D008562:Membrane Glycoproteins; D011993:Recombinant Fusion Proteins; D009700:Nucleoside Deaminases; D000243:Adenosine Deaminase