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标题：Transformation of Mouse 3T3 Cells by Murine Sarcoma Virus: Release of Virus-Like Particles in the Absence of Replicating Murine Leukemia Helper Virus
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作者：R. H. Bassin ; L. A. Phillips ; M. J. Kramer 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1971
卷号：68
期号：7
页码：1520-1524
DOI：10.1073/pnas.68.7.1520
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Small numbers of virus-like particles were observed by electron microscopy in each of two cloned lines of 3T3 cells transformed by murine sarcoma virus, even though these lines were free of detectable quantities of infectious leukemia and sarcoma virus. The morphology and occurrence of the particles were identical to those of the murine leukemia-sarcoma group. Moreover, the particles incorporated uridine and had a buoyant density of 1.16 g/ml in sucrose gradients. No evidence of sarcoma or leukemia virus infectivity was associated with the particles in cells of several susceptible species under various conditions, including both cosedimentation with leukemia virus and infection in the presence of inactivated Sendai virus. The particles may represent a form of murine sarcoma virus deficient in one or more of the viral components necessary for infectivity.
关键词：density gradient centrifugation ; electron microscopy ; [³H]uridine