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The Regulation of Thymidine Secretion by Macrophages

Miguel J. Stadecker and Emil R. Unanue
J Immunol August 1, 1979, 123 (2) 568-571;
Miguel J. Stadecker
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Emil R. Unanue
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Abstract

The secretion of thymidine by mononuclear phagocytes was correlated with the activity of the enzyme thymidine kinase (TK). Macrophages cultured in regular tissue culture medium released thymidine and did not express TK. However, when macrophages were incubated with medium conditioned by L cells, they expressed TK, incorporated 3H thymidine into trichloroacetic acid precipitable material, and ceased to secrete the nucleoside. Furthermore, replicating P388/D1 cells were induced to secrete thymidine by inhibiting TK with d-glucosamine. These results have demonstrated an inverse relationship between thymidine secretion and the expression of TK. They suggest that thymidine secretion by macrophages may be attributed to their lack of TK activity.

Footnotes

  • ↵2 Address reprint requests to: Dr. Miguel J. Stadecker, Department of Pathology, Tufts University School of Medicine, 136 Harrison Avenue, Boston, Massachusetts 02111.

  • ↵1 This work was supported by National Cancer Institute Grants 1 R23 CA 24481 and CA 14732, and by a grant from the Council for Tobacco Research, Inc.

  • Received March 9, 1979.
  • Accepted April 30, 1979.
  • Copyright © 1979 by The American Association of Immunologists, Inc.

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The Journal of Immunology
Vol. 123, Issue 2
1 Aug 1979
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The Regulation of Thymidine Secretion by Macrophages
Miguel J. Stadecker, Emil R. Unanue
The Journal of Immunology August 1, 1979, 123 (2) 568-571;

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The Regulation of Thymidine Secretion by Macrophages
Miguel J. Stadecker, Emil R. Unanue
The Journal of Immunology August 1, 1979, 123 (2) 568-571;
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Print ISSN 0022-1767        Online ISSN 1550-6606