A novel triple-regulated oncolytic adenovirus carrying p53 gene exerts potent antitumor efficacy on common human solid cancers.
Conditionally replicating adenoviruses (CRAd) can replicate specifically in cancer cells and lyse them. The CRAds were widely used in the preclinical and clinical studies of cancer therapy. We hypothesize that more precisely regulated replication of CRAds may further improve the vector safety profile and enhance its antitumor efficacy. Here, a triple-regulated CRAd carrying p53 gene expression cassette, SG600-p53, was engineered. In SG600-p53, the E1a gene with a deletion of 24 nucleotides within CR2 region is controlled under the human telomerase reverse transcriptase (hTERT) promoter, the E1b gene expression is directed by the hypoxia response element (HRE), whereas the p53 gene is controlled by the cytomegalovirus promoter. The precise triple-regulation endows SG600-p53 with enhanced antitumor potential and improved safety profile. The tumor-selective replication of this virus and its antitumor efficacy were characterized in several tumor cell lines in vitro and in xenograft models of human non-small cell lung cancer in nude mice. With the selective replication and oncolysis, it was found by ELISA assay that SG600-p53 expressed p53 efficiently in cancer cells. In NCI-H1299 tumor xenograft models, SG600-p53 displayed a tumor-selective killing capacity. At a dose of 2 x 10(9) plaque-forming units, SG600-p53 could completely inhibit the tumor growth and more effective than replication-defective Ad-p53. Histopathologic examination revealed that SG600-p53 administration resulted in cancer cell apoptosis. We concluded that the triple-regulated SG600-p53, as a more potent and safer antitumor therapeutic, could provide a new strategy for cancer biotherapy.
Laboratory of Viral and Gene Therapy, Eastern Hepatobiliary Surgical Hospital, Second Military Medical University, 225 Changhai Road, Shanghai 200438, People's Republic of China.
Xinghua
X
Wang
Changqing
C
Su
Hui
H
Cao
Kui
K
Li
Jie
J
Chen
Lixin
L
Jiang
Qi
Q
Zhang
Xiaobing
X
Wu
Xiaoyuan
X
Jia
Yongjing
Y
Liu
Weiguo
W
Wang
Xinyuan
X
Liu
Mengchao
M
Wu
Qijun
Q
Qian
D000256:Adenoviridae / Q000378:metabolism* / Q000502:physiology; D017500:Adenovirus E1A Proteins; D000818:Animals; D016923:Cell Death; D045744:Cell Line, Tumor; D006801:Humans; D020128:Inhibitory Concentration 50; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D009369:Neoplasms / Q000473:pathology* / Q000628:therapy*; D050130:Oncolytic Virotherapy; D050504:Oncolytic Viruses / Q000378:metabolism*; D019076:Transgenes; D016159:Tumor Suppressor Protein p53 / Q000235:genetics* / Q000378:metabolism*; D014779:Virus Replication; D023041:Xenograft Model Antitumor Assays
D017500:Adenovirus E1A Proteins; D016159:Tumor Suppressor Protein p53