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Overexpression of Smac by an Armed Vesicular Stomatitis Virus Overcomes Tumor Resistance.


ABSTRACT: Despite reports of successful clinical cases, many tumors appear to resist infection by oncolytic viruses (OVs). To circumvent this problem, an armed vesicular stomatitis virus was constructed by inserting a transgene to express Smac/DIABLO during virus infection (VSV-S). Endogenous Smac in HeLa cells was diminished during wtVSV infection, whereas the Smac level was enhanced during VSV-S infection. Apoptosis was readily induced by VSV-S, but not wtVSV, infection. More importantly, the tumor volume was reduced to a larger extent when xenografts of 4T1 cells in BALB/c mice and OV-resistant T-47D cells in nude mice were intratumorally injected with VSV-S. VSV-S represents a novel mechanism to overcome tumor resistance, resulting in more significant tumor regression due to enhanced apoptosis.

SUBMITTER: Li W 

PROVIDER: S-EPMC6610632 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature

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Overexpression of Smac by an Armed Vesicular Stomatitis Virus Overcomes Tumor Resistance.

Li Weike W   Turaga Ravi Chakra RC   Li Xin X   Sharma Malvika M   Enadi Zahra Z   Dunham Tompkins Sydney Nicole SN   Hardy Kyle Christian KC   Mishra Falguni F   Tsao Jun J   Liu Zhi-Ren ZR   Fan Daping D   Luo Ming M  

Molecular therapy oncolytics 20190604


Despite reports of successful clinical cases, many tumors appear to resist infection by oncolytic viruses (OVs). To circumvent this problem, an armed vesicular stomatitis virus was constructed by inserting a transgene to express Smac/DIABLO during virus infection (VSV-S). Endogenous Smac in HeLa cells was diminished during wtVSV infection, whereas the Smac level was enhanced during VSV-S infection. Apoptosis was readily induced by VSV-S, but not wtVSV, infection. More importantly, the tumor volu  ...[more]

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