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Regulation of the Release of Colony-Stimulating Activity from Mitogen-Stimulated Lymphocytes

Francis W. Ruscetti and Paul A. Chervenick
J Immunol May 1, 1975, 114 (5) 1513-1517;
Francis W. Ruscetti
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Paul A. Chervenick
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Abstract

Lymphocytes stimulated by Concanavalin A (Con A) as well as other mitogens release colony stimulating activity (CSA) which stimulated granulocyte and mononuclear cell formation from hematopoietic progenitor cells in vitro. Removal of Con A from lymphocyte cultures by the competitive inhibitor, α methyl mannoside, resulted in the cessation of CSA release regardless of the time the inhibitor was added to the cultures. However, removal of Con A after 6 hr of incubation had no effect on cellular DNA synthesis and lymphocyte transformation. In addition, vinblastine and cytosine arabinoside completely inhibited DNA synthesis but had no effect on CSA release. CSA release is dependent on an active energy process since it was completely and reversibly inhibited by the inhibitors of protein synthesis puromycin and cycloheximide. These results suggest that CSA release from stimulated lymphocytes requires continuous binding of mitogen and active protein synthesis but is not dependent on DNA synthesis and cell proliferation.

Footnotes

  • ↵2 Leukemia Society of America Scholar.

  • ↵1 This work was presented in part at the annual meeting of the American Society of Hematology, December, 1974. This study was aided by grants from the National Institutes of Health (1 RO1 CA14278 01A1) and the American Cancer Society (ET-10C).

  • Received January 27, 1975.
  • Copyright © 1975 by The American Association of Immunologists, Inc.

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The Journal of Immunology
Vol. 114, Issue 5
1 May 1975
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Regulation of the Release of Colony-Stimulating Activity from Mitogen-Stimulated Lymphocytes
Francis W. Ruscetti, Paul A. Chervenick
The Journal of Immunology May 1, 1975, 114 (5) 1513-1517;

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Regulation of the Release of Colony-Stimulating Activity from Mitogen-Stimulated Lymphocytes
Francis W. Ruscetti, Paul A. Chervenick
The Journal of Immunology May 1, 1975, 114 (5) 1513-1517;
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Print ISSN 0022-1767        Online ISSN 1550-6606