REGULATION OF INTERLEUKIN-2 RESPONSES BY PHOSPHATIDIC-ACID

被引:27
作者
CANO, E [1 ]
MUNOZFERNANDEZ, MA [1 ]
FRESNO, M [1 ]
机构
[1] UNIV AUTONOMA MADRID CANTOBLANCO,CSIC,CTR BIOL MOLEC,E-28049 MADRID,SPAIN
关键词
D O I
10.1002/eji.1830220731
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
Interleukin-2 (IL-2) plays a central role in the immune system by regulating the proliferation and differentiation of T lymphocytes. However, the molecular mechanism of the signal transduction through the IL-2 receptor is poorly understood. We have studied the role of phosphatidic acid (PA) on IL-2 signal transduction using cloned T lymphocytes. IL-2 stimulated a transient increase in the PA concentration in resting CTLL-2 cells prelabeled with [H-3]palmitic acid. This effect was detected as early as 1 min after IL-2 addition and peaked at 5 min. IL-2 similarly increased phospholipase D activity in intact CTLL-2 cells, as inferred by phosphatidylethanol production. By contrast, IL-2 did not affect [H-3]palmitic acid-labeled diacylglycerol levels. Furthermore, exogenous addition of several natural or synthetic PA to T cells mimicked IL-2 activity. Thus, PA were able to induce DNA synthesis on CTLL-2 cells, although this effect was only 10%-20% of that observed with IL-2. PA showed a synergistic effect with low doses of IL-2. In addition, PA was able to induce c-myc RNA transcription in CTLL-2 cells as well as IL-2 receptor (CD25) expression on the cell membrane with equal potency as saturating doses of IL-2. It is likely that IL-2-induced PA accumulation is a consequence of phospholipase D activation. This hypothesis is further supported by the fact that the addition of exogenous phospholipase D but not phosphatidylinositol-specific phospholipase C also reproduced the IL-2 or PA effects mentioned above. In summary, our results suggest a role of phospholipase D activation and PA formation as second messengers of IL-2 activity.
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页码:1883 / 1889
页数:7
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