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Walleye dermal sarcoma virus: expression of a full-length clone or the rv-cyclin (orf a) gene is cytopathic to the host and human tumor cells

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Abstract

Walleye dermal sarcoma virus (WDSV) is etiologically associated with a skin tumor, walleye dermal sarcoma (WDS), which develops in the fall and regresses in the spring. WDSV genome contains, in addition to gag, pol and env, three open reading frames (orfs) designated orf a (rv-cyclin), orf b and orf c. Unintegrated linear WDSV provirus DNA isolated from infected tumor cells was used to construct a full-length WDSV provirus clone pWDSV, while orf a was cloned into pSVK3 to construct the expression vector porfA. Stable co-transfection of a walleye cell line (W12) with pWDSV and pcDNA3 generated fewer and smaller G418-resistant colonies compared to the control. By Northern blot analysis, several small transcripts (2.8, 1.8, 1.2, and 0.8 kb) were detected using a WDSV LTR-specific probe. By RT-PCR and Southern blot analysis, three cDNAs (2.4, 1.6 and 0.8 kb) were identified, including both orf a and orf b messenger. Furthermore stable co-transfection of both a human lung adenocarcinoma cell line (SPC-A-1) and a cervical cancer cell line (HeLa) with pcDNA3 and ether porfA or pWDSV also generated fewer and smaller G418-resistant colonies. We conclude that expression of the full-length WDSV clone or the orf a gene inhibits the host fish and human tumor cell growth, and Orf A protein maybe a potential factor which contributes to the seasonal tumor development and regression. This is the first fish provirus clone that has been expressed in cell culture system, which will provide a new in vitro model for tumor research and oncotherapy study.

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Acknowledgments

Our research was supported by grants from the National Natural Science Foundation of China (No. 30870119).

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Authors and Affiliations

  1. College of Animal Science and Technology, Northwest A&F University, No. 22 Xinong Road, Yangling, 712100, Shaan’xi, People’s Republic of China

    Kun Xu, Ting Ting Zhang, Ling Wang, Cun Fang Zhang, Long Zhang, Li Xia Ma, Ying Xin, Chong Hua Ren, Zhi Qiang Zhang, Qiang Yan & Zhi Ying Zhang

  2. Département de Pathologie et Microbiologie, Faculté de Médecine Vétérinaire, Université de Montréal, Saint-Hyacinthe, QC, PQ J2S 7C5, Canada

    Daniel Martineau

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  1. Kun Xu
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Correspondence to Zhi Ying Zhang.

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K. Xu and T.T. Zhang are co-first authors.

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Xu, K., Zhang, T.T., Wang, L. et al. Walleye dermal sarcoma virus: expression of a full-length clone or the rv-cyclin (orf a) gene is cytopathic to the host and human tumor cells. Mol Biol Rep 40, 1451–1461 (2013). https://doi.org/10.1007/s11033-012-2188-5

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  • DOI: https://doi.org/10.1007/s11033-012-2188-5

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