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Localization of Intracytoplasmic A Particles in Mouse Tumors by Light Microscopy

Harutaka Tanaka, Daijiro Tsujimura and Kunie Nakamura
Harutaka Tanaka
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Daijiro Tsujimura
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Kunie Nakamura
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DOI:  Published June 1974
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Summary

Two methods for identifying aggregates of intracytoplasmic A particles (referred to as A particles) at the light microscopic level are described in this paper. The first is an immunofluorescent method using antisera against these particles. In mammary tumors examined both in sections and in smears, specific fluorescence was found in the form of discrete granules, confined to the cytoplasmic hemisphere proximal to the lumen. Neither nuclear nor diffuse cytoplasmic fluorescence was confirmed. All features of these fluorescing granules seem to justify their identification with A and B particles in various clusters. It has also been shown that transplanted tumors contain more A particles at the sacrifice of B particles than do spontaneous tumors. Specifically fluorescing granules were also observed in the cytoplasm of smears of mouse leukemia cells that were known to carry A particles. These granules were stained red by the second method described, with fuchsin acid and methylene blue as stains, and were referred to as inclusion bodies. Specificity of fuchsin acid staining was confirmed by a direct identification of inclusion bodies with specifically fluorescing granules in the same area of a smear. Because the staining is so simple and provides permanent preparations, it can be effectively used for studies on A particles in mouse leukemias.

Footnotes

  • ↵1 Supported by Grants 9131, 90172, and 92139 from the Ministry of Education, Japan.

  • Received July 7, 1972.
  • Accepted February 1, 1974.
  • ©1974 American Association for Cancer Research.
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June 1974
Volume 34, Issue 6
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Localization of Intracytoplasmic A Particles in Mouse Tumors by Light Microscopy
Harutaka Tanaka, Daijiro Tsujimura and Kunie Nakamura
Cancer Res June 1 1974 (34) (6) 1465-1474;

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Localization of Intracytoplasmic A Particles in Mouse Tumors by Light Microscopy
Harutaka Tanaka, Daijiro Tsujimura and Kunie Nakamura
Cancer Res June 1 1974 (34) (6) 1465-1474;
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