| RRC ID |
72388
|
| 著者 |
Ueda K, Iwahashi M, Nakamori M, Nakamura M, Matsuura I, Yamaue H, Tanimura H.
|
| タイトル |
Carcinoembryonic antigen-specific suicide gene therapy of cytosine deaminase/5-fluorocytosine enhanced by the cre/loxP system in the orthotopic gastric carcinoma model.
|
| ジャーナル |
Cancer Res
|
| Abstract |
Tumor-specific gene delivery is crucial to achieving successful effects in suicide gene therapy. Carcinoembryonic antigen (CEA) promoter has been widely used for this purpose, but the expression level of tumor-specific promoters such as CEA promoter is generally low. In the previous study, we used the Cre/loxP system and showed that LacZ expression by the CEA promoter was remarkably enhanced and maintained its specificity using the Cre/loxP regulation system. In this study, the Cre/loxP system was first applied to augmentation of selective expression of the cytosine deaminase (CD) gene as a suicide gene therapy in CEA-producing cells. The double infection with AxCEANCre expressing Cre recombinase under the control of the CEA promoter and AxCALNLCD expressing the CD gene under the control of the CAG promoter by the Cre switching system rendered CEA-producing tumor cells 13-fold more sensitive to 5-fluorocytosine (5-FC) compared with the single infection with AxCEACD expressing CD gene driven by the CEA promoter. The therapeutic efficacy of the enhanced CD/5-FC suicide gene therapy was evaluated in orthotopic implantation models of human gastric carcinoma. Adenovirus vectors (1 x 10(9) plaque-forming units) were administered i.p. into mice three times, and then 5-FC was administered i.p. for the next 10 days. Tumor volume and weight in mice treated with AxCEANCre and AxCALNLCD/5-FC were significantly reduced as compared with those in mice treated not only with Mock (AxCALacZ) but also with AxCEACD/5-FC (P < 0.0001). This beneficial effect on tumor burden was also reflected in the overall survival. The survival periods of the mice treated with AxCEANCre and AxCALNLCD/5-FC were longer than those of mice treated with Mock or AxCEACD/5-FC (P < 0.01). These results suggested that application of the Cre/loxP system could provide a new approach for enhanced selective suicide gene therapy of CD/5-FC for the treatment of advanced gastric carcinoma.
|
| 巻・号 |
61(16)
|
| ページ |
6158-62
|
| 公開日 |
2001-8-15
|
| PMID |
11507067
|
| MeSH |
Adenoviridae / genetics
Animals
Antimetabolites, Antineoplastic / pharmacokinetics
Antimetabolites, Antineoplastic / pharmacology*
Carcinoembryonic Antigen / biosynthesis
Carcinoembryonic Antigen / genetics*
Cytosine Deaminase
Female
Flucytosine / pharmacokinetics
Flucytosine / pharmacology*
Gene Expression
Genetic Therapy / methods*
Genetic Vectors / genetics
HeLa Cells
Humans
Integrases / genetics
Mice
Mice, Inbred BALB C
Mice, Nude
Nucleoside Deaminases / genetics*
Nucleoside Deaminases / metabolism
Promoter Regions, Genetic / genetics
Stomach Neoplasms / genetics
Stomach Neoplasms / immunology
Stomach Neoplasms / therapy*
Tumor Cells, Cultured
Viral Proteins / genetics
|
| IF |
9.727
|
| リソース情報 |
| ヒト・動物細胞 |
MKN45(RCB1001)
MKN1(RCB1003)
HeLa(RCB0007) |
