Target cell-induced apoptosis of interleukin-2-activated human natural killer cells: Roles of cell surface molecules and intracellular events

被引:46
|
作者
Yamauchi, A
Taga, K
Mostowski, HS
Bloom, ET
机构
[1] US FDA,CTR BIOL EVALUAT & RES,DIV CELLULAR & GEN THERAPIES,LAB CELLULAR IMMUNOL HFM518,BETHESDA,MD 20892
[2] US FDA,CTR BIOL EVALUAT & RES,DIV HEMATOL PROD,BETHESDA,MD 20892
关键词
D O I
10.1182/blood.V87.12.5127.bloodjournal87125127
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
We previously reported that natural killer (NK)-sensitive target cells, K562, kill interleukin-2-stimulated (lymphokine-activated killer [LAK]) but not unstimulated NK cells. We have now investigated the molecular basis of this phenomenon. Soluble monoclonal antibody (MoAb) to CD18 inhibited 75% of K562-induced DNA fragmentation and membrane disruption, whereas blocking MoAb to Fas partially inhibited only the DNA fragmentation. MoAbs to CD2, CD11a, CD11b, B7, or CD16 had limited or no effect on K562-induced death of LAK cells. Receptor ligation with either immobilized MoAb to CD18 or Fas induced membrane disruption and DNA degradation in LAK cells independently of K562, and MoAb to CD18, CD11a, or CD11b enhanced DNA fragmentation induced by anti-fas. Fas-L-transfected Raji cells also killed LAK cells, but only if Fast expression was amplified. K562 cells rapidly triggered protein phosphorylation in LAK cells, and the tyrosine kinase inhibitor, Herbimycin A, inhibited DNA fragmentation and membrane disruption. Protease inhibitors strongly suppressed K562-mediated DNA fragmentation of LAK cells, but not membrane disruption. In conclusion, (1) K562-induced death of LAK cells involves primarily CD18, although other molecules, such as Fas, may also be involved; (2) K562-mediated apoptosis of LAK cells requires tyrosine phosphorylation and protease activity; (3) engagement of Fas by immobilized MoAb or Fas-L on target cells can also kill LAK cells; and (4) Fas-immobilized MoAb synergizes with coimmobilized MoAb to CD11a, CD11b, or CD18 for LAK cell killing. Activation-induced death of NK cells may represent a mechanism for NK cell regulation. This is a US government work. There are no restrictions on its use.
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收藏
页码:5127 / 5135
页数:9
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