Enhanced Oncolytic Effect and Anti-Tumor Effect of Replication Competent Adenovirus with Double Mutation in E1A & E1B Regions.
- Author:
Jaesung KIM
1
;
Kyung Ju CHOI
;
Pyung Hwan KIM
;
Joo Hang KIM
;
Joo Hyuk SOHN
;
Chae Ok YUN
Author Information
1. Brain Korea 21 Project for Medical Sciences, Institute for Cancer Research, Yonsei Cancer Center, Yonsei University College of Medicine, Seoul, 120-752, Korea. chaeok@yumc.yonsei.ac.kr
- Publication Type:Original Article
- Keywords:
Cancer gene therapy;
Conditionally-replicating adenovirus;
Apoptosis
- MeSH:
Adenoviridae*;
Animals;
Apoptosis;
Binding Sites;
Homicide;
Humans;
Mice;
Mice, Nude;
Retinoblastoma
- From:Journal of Bacteriology and Virology
2005;35(2):113-124
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
Gene-modified replication-competent adenoviruses (Ads) are emerging as a promising new modality for the treatment of cancer. We have previously shown that E1B 19kDa and E1B 55kDa gene deleted Ad (Ad-deltaE1B19/55) exhibits improved tumor-specific replication and cell lysis, leading to potent anti-tumor effect. As an additional effort to increase cancer cell-selectivity of replicating adenovirus, we have first generated eleven E1A-mutant Ads (Ad-mt#1~#11) with deletion or substitution in retinoblastoma (Rb) binding sites of E1A. Of these viruses, Ad-mt#7 demonstrated significantly improved cytopathic effect (CPE) and viral replication in a cancer cell-specific manner. To further increase the cancer cell-specific killing effect of Ad-mt#7, both E1B 19kDa and E1B 55kDa genes were deleted, resulting in an Ad-deltaE1Bmt7. As assessed using CPE assay, MTT assay, and immunoblot analysis for Ad fiber expression, Ad-deltaE1Bmt7 exerted markedly enhanced cancer cell-specific killing effect as well as viral replication in comparison to either Ad-mt#7 or Ad-deltaE1B19/55. Furthermore, the growth of established human cervical carcinoma in nude mice was significantly suppressed by intratumoral injection of Ad-deltaE1Bmt7. In summary, we have developed an oncolytic adenovirus with significantly improved therapeutic profiles for cancer treatment.
