Effect of decorin on overcoming the extracellular matrix barrier for oncolytic virotherapy.

Abstract:

:The pressing challenge for contemporary gene therapy is to deliver enough therapeutic genes to enough cancer cells in vivo. With the aim of improving viral distribution and tumor penetration, we explored the use of decorin to enhance viral spreading and tumor tissue penetration. We generated decorin-expressing replication-incompetent (dl-LacZ-DCNG, dl-LacZ-DCNQ and dl-LacZ-DCNK) and replication-competent (Ad-DeltaE1B-DCNG, Ad-DeltaE1B-DCNQ and Ad-DeltaE1B-DCNK) adenoviruses (Ads). Point mutants of decorin gene (DCNG), DCNK and DCNQ, have a negative and moderate binding affinity to type-I collagen fibril, respectively. In both tumor spheroids and established solid tumors in vivo, tissue penetration potency of dl-LacZ-DCNG was greatly enhanced than those of dl-LacZ, dl-LacZ-DCNQ and dl-LacZ-DCNK, and this enhanced tissue penetration effect derived from decorin-expressing Ad was dependent on the binding affinity of decorin to collagen fibril. Expression of DCNG enhanced viral spread of replicating Ad, leading to improved tumor reduction and survival benefit. Moreover, the tumoricidal effects of Ad-DeltaE1B-DCNQ and Ad-DeltaE1B-DCNK were lessened, as the binding affinity to collagen was decreased, showing that the increased cancer cell cytotoxicity was driven by the action of decorin on extracellular matrix (ECM). Furthermore, Ad-DeltaE1B-DCNG substantially decreased ECM components within the tumor tissue. Finally, intratumoral injection of Ad-DeltaE1B-DCNG in primary tumor site greatly reduced the formation of B16BL6 melanoma cell pulmonary metastases in mice. Taken together, these data show the utility of decorin as a dispersion agent and highlight its utility and potential in improving the efficacy of replicating Ad-mediated cancer gene therapy.

journal_name

Gene Ther

journal_title

Gene therapy

authors

Choi IK,Lee YS,Yoo JY,Yoon AR,Kim H,Kim DS,Seidler DG,Kim JH,Yun CO

doi

10.1038/gt.2009.142

subject

Has Abstract

pub_date

2010-02-01 00:00:00

pages

190-201

issue

2

eissn

0969-7128

issn

1476-5462

pii

gt2009142

journal_volume

17

pub_type

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