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Effect of Hyperthermia on Normal and Neoplastic Cells in Vitro

Robert Love, Ramon Z. Soriano and Richard J. Walsh
Robert Love
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Ramon Z. Soriano
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Richard J. Walsh
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DOI:  Published May 1970
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Summary

The effects of hyperthermia on 3 lines of HeLa cells, 3 lines of human diploid cells, and BHK 21 cells were similar. Exposure of exponentially growing cells to 45–46° for periods of 15 to 60 min resulted in disappearance of nucleolar DNA and diffusion of nucleolinar material, as demonstrated by toluidine blue-molybdate, acid phosphatase, and lead staining throughout the nucleolus. Ultrastructural studies of the heated cells indicated that the fibrillar component of the nucleolus, like the nucleolini, became diffusely distributed throughout the nucleolus and that the granular component of the nucleolus almost completely disappeared. Hyperthermia led to the formation of cytoplasmic inclusions in 100% of cells with nucleoli. The inclusions were cytochemically similar to the body of the nucleolus observed by light microscopy and consisted of aggregations of ribosome-like granules in electron micrographs. Evidence is presented to indicate that the inclusions were derived from the nucleolus and possibly from the granular component. Hyperthermia also resulted in disaggregation of polysomes. The effects of heating to 46° for 15 min were completely reversible.

Footnotes

  • ↵1 This investigation was supported by NIH Grants CA-05402 and GM-0813.

  • Received October 30, 1969.
  • Accepted January 23, 1970.
  • ©1970 American Association for Cancer Research.
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May 1970
Volume 30, Issue 5
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Effect of Hyperthermia on Normal and Neoplastic Cells in Vitro
Robert Love, Ramon Z. Soriano and Richard J. Walsh
Cancer Res May 1 1970 (30) (5) 1525-1533;

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Effect of Hyperthermia on Normal and Neoplastic Cells in Vitro
Robert Love, Ramon Z. Soriano and Richard J. Walsh
Cancer Res May 1 1970 (30) (5) 1525-1533;
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Cancer Research Online ISSN: 1538-7445
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