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The effect of phorbol esters on tumor cell sensitivity to macrophage-mediated cytostasis.

Authors
  • Nycum, L M
  • Fishman, M
Type
Published Article
Journal
Cellular immunology
Publication Date
Jan 01, 1989
Volume
118
Issue
1
Pages
147–156
Identifiers
PMID: 2910500
Source
Medline
License
Unknown

Abstract

Macrophage-mediated cytostasis was measured in a mouse syngeneic system where EL4 thymoma cells were found to be inhibited by C57B1/6 mouse macrophages. When tumor cells were pretreated with TPA, they became resistant to macrophage-mediated stasis. Nonelutriated as well as elutriated cells enriched in G1/early S and late S were sensitive to macrophage-mediated stasis. However, when elutriated cells were treated with TPA, cells enriched in G1/early S were rendered resistant to the cytostatic activity of macrophages whereas cells enriched in late S were not. The TPA effect on tumor cell susceptibility to stasis was found to be reversible and a nontumor-promoting phorbol ester, alpha-PDD, was ineffective.

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