Immune gene-viral therapy with triplex efficacy mediated by oncolytic adenovirus carrying an interferon-gamma gene yields efficient antitumor activity in immunodeficient and immunocompetent mice.
Among numerous gene therapeutic strategies for cancer treatment, gene transfer by conditionally replicative adenovirus (CRAd) of interferon-gamma (IFN-gamma) may be useful because of the possibility that it will yield IFN-gamma-mediated antiangiogenesis, immune responses, and CRAd-mediated oncolysis. In this study, we constructed a human TERT promoter-mediated oncolytic adenovirus targeting telomerase-positive cancers and armed with a mouse or human IFN-gamma gene to generate novel immune gene-viral therapeutic systems, CNHK300-mIFN-gamma and CNHK300-hIFN-gamma, respectively. The systems can specifically target, replicate in, and lyse cancer cells, while sparing normal cells. The advantage of these systems is that the number of transgene copies and their expression increase markedly via viral replication within infected cancer cells, and replicated viral progeny can then infect additional cancer cells within the tumor mass. CNHK300-mIFN-gamma induced regression of xenografts in liver cancer models in both immunodeficient and immunocompetent mice by triplex mechanisms including selective oncolysis, antiangiogenesis, and immune responses. We conclude that combining immune gene therapy and oncolytic virotherapy can enhance antitumor efficacy as a result of synergism between CRAd oncolysis and transgene composite antitumor responses.
Su
Changqing
C
Laboratory of Viral and Gene Therapy, Eastern Hepatobiliary Surgical Hospital, Second Military Medical University, Shanghai 200438, China.
Peng
Linhui
L
Sham
Jonathan
J
Wang
Xinghua
X
Zhang
Qi
Q
Chua
Daniel
D
Liu
Chen
C
Cui
Zhenfu
Z
Xue
Huibin
H
Wu
Hongping
H
Yang
Qin
Q
Zhang
Baihe
B
Liu
Xinyuan
X
Wu
Mengchao
M
Qian
Qijun
Q
D000256:Adenoviridae / Q000235:genetics* / Q000502:physiology; D017500:Adenovirus E1A Proteins / Q000235:genetics; D000818:Animals; D002460:Cell Line; D045744:Cell Line, Tumor; D004268:DNA-Binding Proteins / Q000235:genetics; D015316:Genetic Therapy; D005822:Genetic Vectors / Q000008:administration & dosage / Q000627:therapeutic use; D006801:Humans; D007371:Interferon-gamma / Q000235:genetics* / Q000627:therapeutic use*; D008114:Liver Neoplasms, Experimental / Q000473:pathology / Q000628:therapy*; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D009389:Neovascularization, Pathologic / Q000517:prevention & control; D019098:Telomerase / Q000235:genetics; D019076:Transgenes; D014183:Transplantation, Heterologous; D014779:Virus Replication
D017500:Adenovirus E1A Proteins; D004268:DNA-Binding Proteins; D007371:Interferon-gamma; C509186:TERT protein, human; D019098:Telomerase; C509187:Tert protein, mouse