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The Journal of Immunology, Vol 149, Issue 4 1199-1203, Copyright © 1992 by American Association of Immunologists
ARTICLES |
K Sugita, MJ Robertson, Y Torimoto, J Ritz, SF Schlossman and C Morimoto
Division of Tumor Immunology, Dana-Farber Cancer Institute, Boston, MA.
The CD27 Ag is expressed by the majority of resting T lymphocytes and appears to play a crucial role in T cell activation. We found that some resting peripheral blood NK cells also express CD27. Furthermore, CD27 expression was up-regulated on NK cells stimulated by IL-2. The cytolytic activity of IL-2-activated, but not resting, NK cells was inhibited by an anti-CD27 mAb (anti-1A4). However, anti-1A4 did not affect conjugate formation between IL-2-activated NK cells and tumor cell targets. In contrast, anti-1A4 inhibited CD2-mediated calcium mobilization and the serine esterase activity of NK cell granules. These inhibitory effects could be mediated in part by increase in intracellular cAMP levels induced by anti-1A4. Our results suggest that the CD27 Ag plays an important role in the regulation of activated NK cells.
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