ABSTRACT
<p><b>OBJECTIVE</b>To construct an inducible eukaryotic vector carrying red fluorescent protein (DsRed) and evaluate the regulation of DsRed gene expression in vitro.</p><p><b>METHODS</b>The vector pRS17-RUDsRed containing DsRed gene, promoter and RU486-inducible system was constructed using molecular biological methods. To minimize potential interference, the two transcriptional elements were spaced with a 1.6 kb insulator. Fluorescence microscopy and flow cytometry were used to observe the activation of this regulatable vector after transfection in MFC cells.</p><p><b>RESULTS</b>The vector was identified by digestion with different restriction enzymes, sequencing and PCR. In the absence of RU486, the cells transfected with the vector exhibited very low DsRed protein expression, and the addition of RU486 induced efficient DsRed expression in the cells.</p><p><b>CONCLUSION</b>The RU486-inducible eukaryotic vector carrying DsRed protein allows effective regulation of the target gene expression in vitro, which provides a useful tool for gene regulation and gene therapy studies.</p>