Expression of tumor suppressor REIC/Dkk-3 by a newly improved adenovirus vector with insertion of a hTERT promoter at the 3′-side of the transgene | Zendy

Endy Widya Putranto | Zendy; Rie Kinoshita | Zendy; Masami Watanabe | Zendy; Takuya Sadahira | Zendy; Hitoshi Murata | Zendy; Kenichi Yamamoto | Zendy; Junichiro Futami | Zendy; Ken Kataoka | Zendy; Yusuke Inoue | Zendy; I Made Winarsa Ruma | Zendy; I Wayan Sumardika | Zendy; Youyi Chen | Zendy; Miyoko Kubo | Zendy; Yoshihiko Sakaguchi | Zendy; Kenji Saito | Zendy; Yasutomo Nasu | Zendy; Hiromi Kumon | Zendy; Namho Huh | Zendy; Masakiyo Sakaguchi | Zendy

Open Access

Expression of tumor suppressor REIC/Dkk-3 by a newly improved adenovirus vector with insertion of a hTERT promoter at the 3′-side of the transgene

Author(s) -

Endy Widya Putranto,

Rie Kinoshita,

Masami Watanabe,

Takuya Sadahira,

Hitoshi Murata,

Kenichi Yamamoto,

Junichiro Futami,

Ken Kataoka,

Yusuke Inoue,

I Made Winarsa Ruma,

I Wayan Sumardika,

Youyi Chen,

Miyoko Kubo,

Yoshihiko Sakaguchi,

Kenji Saito,

Yasutomo Nasu,

Hiromi Kumon,

Namho Huh,

Masakiyo Sakaguchi

Publication year - 2017

Publication title -

oncology letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.766

H-Index - 54

eISSN - 1792-1082

pISSN - 1792-1074

DOI - 10.3892/ol.2017.6201

Subject(s) - immortalised cell line , telomerase reverse transcriptase , hek 293 cells , biology , transgene , cancer research , adenoviridae , microbiology and biotechnology , cell culture , promoter , oncogene , genetic enhancement , viral vector , transfection , gene , telomerase , gene expression , cell cycle , recombinant dna , genetics

Reduced expression in immortalized cells (REIC)/Dickkopf-3 (Dkk-3) overexpression, induced using an adenovirus (Ad)-REIC, has been revealed to have a dramatic therapeutic effect on multiple types of cancer. To achieve an improved therapeutic effect from Ad-REIC on cancer, our group previously developed an enhanced gene expression system, the C-TSC cassette [cytomegalovirus (CMV)-RU5' located upstream (C); another promoter unit composed of triple tandem promoters, human telomerase reverse transcriptase (hTERT), simian virus 40 and CMV, located downstream of the cDNA (TSC); plus a polyadenylation (polyA) signal]. When applied to the conventional Ad-REIC, this novel system induced the development of an enhanced product, Ad-C-TSC-REIC, which exhibited a noticeable anticancer effect. However, there were difficulties in terms of Ad-C-TSC-REIC productivity in HEK293 cells, which are a widely used donor cell line for viral production. Productivity of Ad-C-TSC-REIC was significantly reduced compared with the conventional Ad-REIC, as the Ad-C-TSC-REIC had a significantly higher ability to induce apoptotic cell death of not only various types of cancer cell, but also HEK293 cells. The present study aimed to overcome this problem by modifying the C-TSC structure, resulting in an improved candidate: A C-T cassette (C: CMV-RU5' located upstream; T: another promoter unit composed of a single hTERT promoter, located downstream of the cDNA plus a polyA signal), which demonstrated gene expression comparable to that of the C-TSC system. The improved adenovirus REIC/Dkk-3 product with the C-T cassette, named Ad-C-T-REIC, exhibited a higher expression level of REIC/Dkk3, similar to that of Ad-C-TSC-REIC. Notably, the vector mitigated the cell death of donor HEK293 cells, resulting in a higher rate of production of its adenovirus. These results indicated that Ad-C-T-REIC has the potential to be a useful tool for application in cancer gene therapy.

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