EVIDENCE THAT INTERLEUKIN-4 SUPPRESSION OF LYMPHOKINE-ACTIVATED KILLER-CELL INDUCTION IS MEDIATED THROUGH MONOCYTES

被引:0
作者
BROOKS, B [1 ]
PARRY, H [1 ]
LAWRY, J [1 ]
REES, R [1 ]
机构
[1] UNIV SHEFFIELD, SCH MED, DEPT EXPTL & CLIN MICROBIOL, TUMOR BIOL & IMMUNOL SECT, SHEFFIELD S10 2TN, S YORKSHIRE, ENGLAND
关键词
D O I
暂无
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
Recombinant human interleukin-4 (IL-4) and transforming growth factor-beta (TGF-beta) reduce recombinant interleukin-2 (IL-2) induction of lymphokine-activated killer (LAK) cell activity from human peripheral blood mononuclear cells (PBMC). Monocytes can be removed from PBMC by adherence, leaving a peripheral blood lymphocyte population (PBL) which also responds to IL-2 to generate LAK activity. PBL generation of LAK cytotoxicity is susceptible to inhibition by TGF-beta, but not by IL-4. Readdition of purified monocytes to PBL is accompanied by return of the suppressive action of IL-4 on the generation of LAK activity. Induction of LAK cytolysis from Percoll-isolated T cells (> 90% CD3+) is also refractory to the inhibitory effect of IL-4. When PBMC were cultured in IL-2, with and without IL-4, subsequent sorting of CD3+ and CD3- lymphocytes by flow cytometry demonstrated that IL-4 had suppressed LAK induction in both effector populations. This suggests that, although isolated CD3+ cells are not susceptible to IL-4 suppression of IL-2 activation, they are sensitive to inhibition when part of a mixed PBMC population. Evidence is presented for the first time that this suppression is mediated via the action of IL-4 on monocytes.
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页码:343 / 348
页数:6
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