The Journal of Experimental Medicine
StemCell Technologies
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The Journal of Experimental Medicine, Vol 102, 361-370, Copyright, 1955, by The Rockefeller Institute for Medical Research New York

ARTICLE

STUDIES WITH THE ELECTRON MICROSCOPE OF VIRUS-HOST RELATIONSHIPS IN EHRLICH ASCITES TUMOR CELLS : I. THE IDENTIFICATION AND STRUCTURE OF ANOPHELES A VIRUS



Marlene Friedlaender Ph.D.1, Dan H. Moore Ph.D.1, Robert Love M.D.1, Ray A. Brown Ph.D.1, and Hilary Koprowski M.D.1

1 From the Department of Microbiology, College of Physicians and Surgeons, Columbia University, New York, and the Viral and Rickettsial Division, Research Division, American Cyanamid Company, Pearl River, New York

Sections of Ehrlich ascites tumor cells infected with anopheles A virus revealed particles in the cytoplasm, which were identified as the virus on the basis of their consistent size and internal structure; their high opacity in the electron beam after fixation with osmic acid; the localized occurrence, within a certain time interval following infection, of high concentrations of such particles within the cell; the absence of similar particles in uninoculated tumor cells and cells infected with other viruses, and the appearance of such particles in infected chorioallantoic membrane.

The particles are spheroid, with a transparent 25 to 30 mµ core, surrounded by an opaque complex shell 12 to 17 mµ in thickness. Apparently "hollow," globular components of this shell have outer and inner diameters of approximately 12 mµ and 5 to 7 mµ respectively. The validity of an additional outer envelope is discussed.

Particles are frequently embedded in a matrix, and their alignment and grouping are discussed. Markedly dense populations are found near nuclear concavities. Some infective changes in the cell are described, for example the formation of newly observed virus-induced necrotic regions.

 Submitted on May 17, 1955


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