title: Apoptin enhances the oncolytic properties of vaccinia virus and modifies mechanisms of tumor regression.
abstract: A recombinant vaccinia virus VVdGF-ApoS24/2 expressing apoptin selectively kills human cancer cells in vitro [Kochneva et al., 2013]. We compared the oncolytic activity of this recombinant with that of the parental strain L-IVP using a model of human A431 carcinoma xenografts in nude mice. Single intratumoral injections (2×10^7 PFU/mouse) of the viruses produced a dramatic decrease in tumor volumes, which was higher after injection of apoptin-producing virus. The tumor dried out after the injection of recombinant while injection of L-IVP strain resulted in formation of cavities filled with cell debris and liquid. Both viruses rapidly spread in xenografts and replicate exclusively in tumor cells causing their destruction within 8 days. Both viruses induced insignificant level of apoptosis in tumors. Unlike the previously described nuclear localization of apoptin in cancer cells the apoptin produced by recombinant virus was localized to the cytoplasm. The apoptin did not induce a typical apoptosis, but it rather influenced pathway of cell death and thereby caused tumor shrinkage. The replacement of destroyed cells by filamentous material is the main feature of tumor regression caused by the VVdGF-ApoS24/2 virus. The study points the presence of complicated mechanisms of apoptin effects at the background of vaccinia virus replication.
authors.affiliation: Novosibirsk State University, Novosibirsk, Russia. State Research Center of Virology and Biotechnology "Vector", Koltsovo, Russia.
authors.forename: Galina
authors.initials: G
authors.lastname: Kochneva
authors.affiliation: Institute of Chemical Biology and Fundamental Medicine, SB RAS, Novosibirsk, Russia.
authors.forename: Evgeniy
authors.initials: E
authors.lastname: Zonov
authors.affiliation: State Research Center of Virology and Biotechnology "Vector", Koltsovo, Russia.
authors.forename: Antonina
authors.initials: A
authors.lastname: Grazhdantseva
authors.affiliation: Novosibirsk State University, Novosibirsk, Russia. Institute of Chemical Biology and Fundamental Medicine, SB RAS, Novosibirsk, Russia.
authors.forename: Anastasiya
authors.initials: A
authors.lastname: Yunusova
authors.affiliation: State Research Center of Virology and Biotechnology "Vector", Koltsovo, Russia.
authors.forename: Galina
authors.initials: G
authors.lastname: Sibolobova
authors.affiliation: Novosibirsk State University, Novosibirsk, Russia. State Research Center of Virology and Biotechnology "Vector", Koltsovo, Russia.
authors.forename: Evgeniy
authors.initials: E
authors.lastname: Popov
authors.affiliation: State Research Center of Virology and Biotechnology "Vector", Koltsovo, Russia.
authors.forename: Oleg
authors.initials: O
authors.lastname: Taranov
authors.affiliation: Novosibirsk State University, Novosibirsk, Russia. State Research Center of Virology and Biotechnology "Vector", Koltsovo, Russia.
authors.forename: Sergei
authors.initials: S
authors.lastname: Netesov
authors.affiliation: Novosibirsk State University, Novosibirsk, Russia. Engelhardt Institute of Molecular Biology, Moscow.
authors.forename: Peter
authors.initials: P
authors.lastname: Chumakov
authors.affiliation: Novosibirsk State University, Novosibirsk, Russia. Institute of Chemical Biology and Fundamental Medicine, SB RAS, Novosibirsk, Russia.
authors.forename: Elena
authors.initials: E
authors.lastname: Ryabchikova
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000502:physiology; D002294:Carcinoma, Squamous Cell / Q000378:metabolism / Q000628:therapy* / Q000821:virology; D045744:Cell Line, Tumor; D005260:Female; D000882:Haplorhini; D006801:Humans; D051379:Mice; D008819:Mice, Nude; D050130:Oncolytic Virotherapy / Q000379:methods*; D014616:Vaccinia virus / Q000378:metabolism / Q000502:physiology*; D014779:Virus Replication; D023041:Xenograft Model Antitumor Assays