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- W1837444448 abstract "Ribonucleotide reductase is the enzyme responsible for the reduction of ribonucleotides to their corresponding deoxyribonucleotides for DNA synthesis. Ribonucleotide reductase is a multisubunit complex containing two polypeptides, R1 and R2. In addition to catalytic and allosteric regulatory functions, the R1 subunit appears to act as a novel tumor suppressor. Previous studies demonstrated that overexpression of mouse R1 resulted in suppression of tumorigenicity and metastatic potential, whereas expression of antisense RNA, complementary to R1 mRNA, increased anchorage-independent growth of ras-transformed NIH 3T3 cells. The current study investigated the potential of R1 gene therapy for human cancer using a recombinant adenovirus encoding the human R1 gene (rAd5-R1). Recombinant viruses were constructed by FLP-mediated site-specific recombination and demonstrated high infectivity of a human colon carcinoma cell line (Colo320 HRS), as assessed by expression of a viral encoded beta-Gal gene (rAd5-LacZ). R1mRNA and protein were overexpressed in Colo320 HRS cells infected with rAd5-R1 compared with untreated or rAd5-LacZ-infected cells. Infection with rAd5-R1 inhibited Colo320 HRS cell proliferation, in vitro, in a time- and dose-dependent manner. When Colo320 HRS cells were treated with rAd5-R1, before injection into CD-1 mice, there was complete inhibition of tumor growth compared with treatment with rAd5-LacZ. Furthermore, intratumoral injection of rAd5-R1 into Colo320 HRS tumor xenografts inhibited tumor growth in CD-1 mice compared with rAd5-LacZ treated mice (P = 0.0001). These results demonstrate gene-specific antitumor effects of R1 and suggest that rAd5-R1 gene therapy has the potential to improve currently available treatments for colon cancer." @default.
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- W1837444448 date "2003-10-01" @default.
- W1837444448 modified "2023-10-03" @default.
- W1837444448 title "Adenovirus-mediated ribonucleotide reductase R1 gene therapy of human colon adenocarcinoma." @default.
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