E1A- and E1B-Double mutant replicating adenovirus elicits enhanced oncolytic and antitumor effects.

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 an enhanced antitumor effect. In an effort to increase cancer cell selectivity of a replicating adenovirus, we first generated 11 E1A mutant Ads (Ad-E1mt1 to Ad-E1mt11) with deletion or substitution in retinoblastoma (pRb)-binding sites of E1A. Of these, Ad-E1mt7 demonstrated significant improvement in cytopathic effect (CPE) and viral replication in a cancer cell-specific manner. To further enhance the cancer cell specificity of Ad-E1mt7, Ad-DeltaE1Bmt7 was generated, in which both the E1B 19kDa and E1B 55kDa genes were deleted. As assessed in CPE assay and immunoblot analysis for Ad fiber expression, Ad-DeltaE1Bmt7 exerted marked enhancement in cancer cell-specific killing as well as viral replication in comparison with its comparative controls (Ad-E1mt7, Ad-DeltaE1B55). 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 a significantly improved therapeutic profile for cancer treatment.

journal_name

Hum Gene Ther

journal_title

Human gene therapy

authors

Kim J,Kim JH,Choi KJ,Kim PH,Yun CO

doi

10.1089/hum.2006.167

subject

Has Abstract

pub_date

2007-09-01 00:00:00

pages

773-86

issue

9

eissn

1043-0342

issn

1557-7422

journal_volume

18

pub_type

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