Recent research on MR reporter genes has demonstrated their potential for use in transgene expression monitoring. We have conducted a preliminary study on the development of a new MRI reporter system [organic anion transporting polypeptide (OATP) 1B1] that can analyze gene expression level using MR reporter genes. By establishing doxycycline-inducible cell line, we observed T1 shortening on MRI, which indicated increased expression level of the OATP1B1 gene. A strong correlation was observed between conventional methods for measurement of gene expression and rrT1 of MR imaging. In this study, we provide preliminary evidence of the potential application of MRI to determine gene expression.