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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.
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