Tumor-targeted Salmonella expressing cytosine deaminase as an anticancer agent.
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| Abstract |
The study was designed to evaluate whether TAPET-CD, an attenuated strain of Salmonella typhimurium expressing Escherichia coli cytosine deaminase (CD), was capable of converting nontoxic 5-fluorocytosine (5-FC) to the active antitumor agent 5-fluorouracil (5-FU). The antitumor effect of TAPET-CD plus 5-FC against subcutaneously implanted colon tumors was also evaluated. TAPET-CD was given to tumor-bearing mice by a single bolus intravenous administration followed with 5-FC by intraperitoneal administration. TAPET-CD accumulated in tumors at levels 1000-fold higher than that in normal tissues and high levels of 5-FU were detected in tumors in mice treated with both TAPET-CD and 5-FC. No 5-FU could be detected in normal tissues. Inhibition of tumor growth was observed in mice treated with either TAPET-CD alone or TAPET-CD in combination with 5-FC (TAPET-CD/5-FC), but not with 5-FC alone. TAPET-CD/5-FC inhibited tumor growth by 88%-96%, compared to TAPET-CD alone, which inhibited tumor growth by 38%-79%. These data suggest that tumor-targeting Salmonella could be used to deliver prodrug-converting enzyme selectively to tumors and produced anti-tumor effects when the corresponding prodrug was also given.
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| Authors | Ivan King, David Bermudes, Stanley Lin, Michael Belcourt, Jeremy Pike, Kimberly Troy, Trung Le, Martina Ittensohn, John Mao, Wenshang Lang, Jacob D Runyan, Xiang Luo, Zujin Li, Li-Mou Zheng |
| Journal | Human gene therapy (Hum Gene Ther) Vol. 13 Issue 10 Pg. 1225-33 (Jul 01 2002) ISSN: 1043-0342 [Print] United States |
| PMID | 12133275 (Publication Type: Journal Article) |
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