A large body of evidence has established murine double minute 2 (MDM2) as a crucial negative regulator of p53 and the major suppressor of p53 function in tumors with wild-type (wt)-p53.Therefore, by inhibiting MDM2 one may reactivate p53 in tumor cells, leading to their demise.Previous studies revealed that ribosomal protein L23 (RPL23) inhibited MDM2-mediated p53 ubiquitination through direct binding to MDM2, and subsequently induced the p53 level as well as its activity, suggesting that it may be a candidate for use in tumor gene therapy.In the present study, we developed a recombinant adenoviral vector expressing the RPL23 gene under control of the carcinoembryonic antigen (CEA) promoter (rAd/CEA-RPL23), and using an in vitro system with cultured human colorectal carcinoma LoVo cells harboring the wt-p53 gene, we proved that rAd/CEA-RPL23 infection could induce the accumulation of endogenous wt-p53 protein and thus lead to the inhibition of tumor cell growth via inducing cell cycle arrest and apoptosis.In vivo treatment of rAd/CEA-RPL23 also exhibited a significant inhibitory effect on tumor growth in nude mice bearing LoVo xenografts.Furthermore, we showed that rAd/CEA-RPL23 synergized with classic chemotherapeutic agent 5-fluorouracil (5-FU) and enhanced its activity against LoVo cells in vivo and in vitro.Taken together,the data presented here suggest that CEA promoter-targeted exogenous RPL23 expression could be of therapeutic value against human colorectal carcinoma that retains wt-p53.