RT Journal Article SR Electronic T1 The Use of the l-Plastin Promoter for Adenoviral-mediated, Tumor-specific Gene Expression in Ovarian and Bladder Cancer Cell Lines JF Cancer Research JO Cancer Res FD American Association for Cancer Research SP 4405 OP 4413 VO 61 IS 11 A1 Peng, Xue Yan A1 Won, Jong Ho A1 Rutherford, Thomas A1 Fujii, Takuma A1 Zelterman, Daniel A1 Pizzorno, Giuseppi A1 Sapi, Eva A1 Leavitt, John A1 Kacinski, Barry A1 Crystal, Ronald A1 Schwartz, Peter A1 Deisseroth, Albert YR 2001 UL http://cancerres.aacrjournals.org/content/61/11/4405.abstract AB A 2.4-kb truncated l-plastin promoter was inserted either 5′ to the LacZ gene (Ad-Lp-LacZ) or 5′ to the cytosine deaminase (CD) gene (Ad-Lp-CD) in a replication-incompetent adenoviral vector backbone. Infectivity and cytotoxicity experiments with the LacZ and CD vectors suggested that the l-plastin promoter-driven transcriptional units were expressed at much higher levels in explants of ovarian cancer cells from patients and in established ovarian or bladder cancer cell lines than they were in normal peritoneal mesothelial cells from surgical specimens, in organ cultures of normal ovarian cells, or in the established CCD minimal deviation fibroblast cell line. Control experiments showed that this difference was not attributable to the lack of infectivity of the normal peritoneal cells, the normal ovarian cells, or the minimal deviation CCD fibroblast cell line, because these cells showed expression of the LacZ reporter gene when exposed to the replication-incompetent adenoviral vector carrying the cytomegalovirus (CMV)-driven LacZ gene (Ad-CMV-LacZ). The Ovcar-5 and Skov-3 ovarian cancer cell lines exposed to the Ad-Lp-CD adenoviral vector were much more sensitive to the prodrug 5-fluorocytosine (5FC), which is converted from the 5FC prodrug into the toxic chemical 5-fluorouracil, than was the CCD minimal deviation fibroblast cell line after exposure to the same vector. A mouse xenograft model was used to show that the Ad-Lp-CD vector/5FC system could prevent engraftment of ovarian cancer cells in nude mice. Finally, injection of the Ad-Lp-CD vector into s.c. tumor nodules generated a greater reduction of the size of the tumor nodules than did injection of the Ad-CMV-LacZ vectors into tumor nodules. The Ad-Lp-CD vectors were as suppressive to tumor growth as the Ad-CMV-CD vectors. These results suggest that an adenoviral vector carrying the CD gene controlled by the l-plastin promoter (Ad-Lp-CD) may be of potential value for the i.p. therapy of ovarian cancer.