title: Efficient expression of pro-urokinase by human lymphoblastoid Namalwa KJM-1 cells using moloney retroviral promoter.
abstract: We have compared the level of expression of several enhancer/promoters in human lymphoblastoid Namalwa KJM-1 cells when fused to a common reporter gene. A cassette containing the pro-urokinase (pro-UK) coding sequence followed by the rabbit beta-globin and simian virus 40 (SV40) 3' nontranslated region was used for evaluation of the enhancer activity. Cells containing Moloney murine leukemia virus (Mo-MuLV) promoter had an average of 10-20 fold higher expression levels of pro-UK than those containing other promoters, such as SV40 early gene promoter, human cytomegalovirus (hCMV) major immediate-early gene promoter, Rous sarcoma virus (RSV) promoter, and chicken beta-actin gene promoter. The expression level of pro-UK under the control of Mo-MuLV promoter was 2-3 micrograms/10(6) cells/day and was constant for more than 6 months. Furthermore, the production of a high producer clone, obtained by using dhfr gene coamplification, reached 30-40 micrograms/10(6) cells/day. Thus, Mo-MuLV promoter showed the desired characteristics for efficient expression of foreign genes in Namalwa KJM-1 cells.
authors.affiliation: Tokyo Research Laboratories, Kyowa Hakko Kogyo Co., Tokyo, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Satoh
authors.forename: H
authors.initials: H
authors.lastname: Miyaji
authors.forename: T
authors.initials: T
authors.lastname: Nishi
authors.forename: T
authors.initials: T
authors.lastname: Mizukami
authors.forename: S
authors.initials: S
authors.lastname: Sato
authors.forename: S
authors.initials: S
authors.lastname: Itoh
authors.forename: M
authors.initials: M
authors.lastname: Hasegawa
mesh_terms: D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D004742:Enhancer Elements, Genetic / Q000235:genetics; D015870:Gene Expression; D017930:Genes, Reporter / Q000235:genetics; D005822:Genetic Vectors / Q000235:genetics; D006801:Humans; D008214:Lymphocytes; D051379:Mice; D008969:Molecular Sequence Data; D008979:Moloney murine leukemia virus / Q000235:genetics*; D011401:Promoter Regions, Genetic / Q000235:genetics*; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis*; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000235:genetics; D014162:Transfection; D014568:Urokinase-Type Plasminogen Activator / Q000096:biosynthesis* / Q000235:genetics
chemical_list: D011993:Recombinant Fusion Proteins; D011994:Recombinant Proteins; D014568:Urokinase-Type Plasminogen Activator; C067551:saruplase