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An isopropyl beta-D-thiogalactopyranoside (IPTG)-inducible episomal expression system has been established for the human breast carcinoma cell line MCF7. This two-component system includes: (i) a primate cell-specific episomal vector, pEpiLac, that contains an IPTG-inducible promoter and (ii) a cell line derived from MCF7, MCF7/LAP5, which expresses the IPTG-dependent transactivator LAP267. Treatment of MCF7/LAP5 cells with IPTG results in efficient inducible expression of exogenous genes from the inducible promoter in pEpiLac. Up to 300-fold induction can be observed when luciferase is used as a reporter. Inducible expression of the p27KIP1 cyclin-dependent kinase (CDK) inhibitor, the orphan nuclear receptor Nur77 and the angiogenic inducer Cyr61 has also been demonstrated. Expression of the exogenous gene is promptly halted on removal of IPTG. Moreover, the episomal vector can be stably maintained in and easily recovered from MCF7/LAP5 cells. Taken together, this inducible expression system should be applicable for the regulated expression of exogenous genes, especially growth inhibitory or cytotoxic genes, in cells of primate origin.

IPTG-Inducible Episomal Expression System for Exogenous Genes in Primate Cells