A new oncolytic adenoviral vector carrying dual tumour suppressor genes shows potent anti‐tumour effect

Abstract

Cancer Targeting Gene-Viro-Therapy (CTGVT) is a promising cancer therapeutical strategy that strengthens the anti-tumour effect of oncolytic virus by expressing inserted foreign anti-tumour genes. In this work, we constructed a novel adenoviral vector controlled by the tumour-specific survivin promoter on the basis of the ZD55 vector, which is an E1B55KD gene deleted vector we previously constructed. Compared with the original ZD55 vector, this new adenoviral vector (ZD55SP/E1A) showed much better ability of replication and reporter gene expression. We then combined anti-tumour gene interleukine-24 (IL-24) with an RNA polymerase III-dependent U6 promoter driving short hairpin RNA (shRNA) that targets M-phase phosphoprotein 1 (MPHOSPH1, a newly identified oncogene) by inserting the IL-24 and the shRNA of MPHOSPH1 (shMPP1) expression cassettes into the new ZD55SP/E1A vector. Our results demonstrated excellent anti-tumour effect of ZD55SP/E1A-IL-24-shMPP1 in vitro on multiple cancer cell lines such as lung cancer, liver cancer and ovarian caner. At high multiplicity-of-infection (MOI), ZD55SP/E1A-IL-24-shMPP1 triggered post-mitotic apoptosis in cancer cells by inducing prolonged mitotic arrest; while at low MOI, senescence was induced. More importantly, ZD55SP/E1A-IL-24-shMPP1 also showed excellent anti-tumour effects in vivo on SW620 xenograft nude mice. In conclusion, our strategy of constructing an IL-24 and shMPP1 dual gene expressing oncolytic adenoviral vector, which is regulated by the survivin promoter and E1B55KD deletion, could be a promising method of cancer gene therapy.

Gene-viro-therapy targeting liver cancer by a dual-regulated oncolytic adenoviral vector harboring IL-24 and TRAIL

“…CTGVT-DG has been proven to be a promising treatment for various types of cancer, and we have reported different combinations of tumor suppressor genes that may have compensative or synergetic effects, including plasminogen k5/TRAIL, 5 short hairpin RNAs that target M-phase phosphoprotein 1 (shMPP1)/IL-24 20 and manganese superoxide dismutase (MnSOD)/ TRAIL in colorectal carcinoma, 4 and Smac/TRAIL in heptoma. 2 Here we also demonstrated strong antitumor effects of the combined treatment with rec-Ads carrying IL-24 and TRAIL, suggesting IL-24/TRAIL as a promising combination in liver cancer gene therapy.…”

MPHOSPH1: A Potential Therapeutic Target for Hepatocellular Carcinoma

“…MPHOSPH1 was previously classified as an oncogene based on studies of bladder cancer as well as in colorectal and lung cancer cell lines (4,6). To determine whether MPHOSPH1 is upregulated in HCC, IHC detection of MPHOSPH1 was performed in samples from 19 patients with HCC (including four samples of normal adjacent tissues) and 10 nonmalignant tissues ( Fig.…”

“…Western blot analysis was performed as previously reported (6). Detailed antibody information is provided in the Supplementary Materials.…”

“…Generation, identification, production, purification, and titration of the recombinant adenovirus were performed as previously described (6).…”

“…Among these KIFs, M-phase phosphoprotein 1 (MPHOSPH1, also referred to as KIF20B) was reported to be a plus-end-directed kinesin protein, playing a critical role in completion of cytokinesis in late telophase of mitosis (5). Recently, an oncogenic role for MPHOSPH1 in bladder and colorectal cancer cells was reported (4,6).…”