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Oncolytic virotherapy for osteosarcoma using midkine promoter-regulated adenoviruses
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Oncolytic virotherapy for osteosarcoma using midkine promoter-regulated adenoviruses
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Journal Article
Oncolytic virotherapy for osteosarcoma using midkine promoter-regulated adenoviruses
2014
Overview
Oncolytic virotherapy using adenoviruses has potential therapeutic benefits for a variety of cancers. We recently developed MOA5, a tumor-specific midkine promoter-regulated oncolytic vector based on human adenovirus serotype 5 (Ad5). We modified the binding tropism of MOA5 by replacing the cell-binding domain of the Ad5 fiber knob with that from another adenovirus serotype 35 (Ad35); the resulting vector was designated MOA35. Here we evaluated the therapeutic efficacies of MOA5 and MOA35 for human osteosarcoma. Midkine mRNA expression and its promoter activity was significantly high in five human osteosarcoma cell lines, but was restricted in normal cells. Very low levels of adenovirus cellular receptor coxsackievirus/adenovirus receptor (CAR) (Ad5 receptor) expression were observed in MNNG-HOS and MG-63 cells, whereas high levels of CAR expression were seen in the other osteosarcoma cell lines. By contrast, CD46 (Ad35 receptor) was highly expressed in all osteosarcoma cell lines. Infectivity and
in vitro
cytocidal effect of MOA35 was significantly enhanced in MNNG-HOS and MG-63 cells compared with MOA5, although the cytocidal effects of MOA5 were sometimes higher in high CAR-expressing cell lines. In MG-63 xenograft models, MOA35 significantly enhanced antitumor effects compared with MOA5. Our findings indicate that MOA5 and MOA35 allow tailored virotherapy and facilitate more effective treatments for osteosarcoma.
Publisher
Nature Publishing Group US,Nature Publishing Group
Subject
/ Adenoviridae Infections - genetics
/ Adenoviruses, Human - genetics
/ Adenoviruses, Human - physiology
/ Animals
/ Biomedical and Life Sciences
/ Cancer
/ Coxsackie and Adenovirus Receptor-Like Membrane Protein - genetics
/ Female
/ Humans
/ Midkine
/ Nerve Growth Factors - genetics
/ Oncolytic Virotherapy - methods
/ Oncolytic Viruses - genetics
/ Oncolytic Viruses - physiology
/ Sarcoma
/ Tropism
/ Tumors
