Ceramide inhibition of phospholipase D and its relationship to RhoA and ARF1 translocation in GTPγS-stimulated polymorphonuclear leukocytes

被引:17
作者
Mansfield, PJ
Carey, SS
Hinkovska-Galcheva, V
Shayman, JA
Boxer, LA
机构
[1] Univ Michigan, Dept Internal Med, Div Nephrol, Ann Arbor, MI 48109 USA
[2] Univ Michigan, Dept Pediat, Div Hematol Oncol, Ann Arbor, MI 48109 USA
关键词
D O I
10.1182/blood-2002-11-3341
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Phospholipase D (PLD) regulates the polymorphonuclear leukocyte (PMN) functions of phagocytosis, degranulation, and oxidant production. Ceramide inhibition of PLD suppresses PMN function. In streptolysin O-permeabilized PMNs, PLD was directly activated by guanosine 5'-[gamma-thio]triphosphate (GTPgammaS) stimulation of adenosine diphosphate (ADP)ribosylation factor (ARF) and Rho, stimulating release of lactoferrin from specific granules of permeabilized PMNs; PLD activation and degranulation were inhibited by C-2-ceramide but not dihydro-C-2-ceramide. To investigate the mechanism of ceramide's inhibitory effect on PLD, we used a cell-free system to examine PLD activity and translocation from cytosol to plasma membrane of ARF, protein kinase C (PKC)alpha and beta, and RhoA, all of which can activate PLD. GTPgammaS-activated cytosol stimulated PLD activity and translocation of ARF, PKCalpha and beta, and RhoA when recombined with cell membranes. Prior incubation of PMNs with 10 muM C-2-ceramide inhibited PLD activity and RhoA translocation, but not ARF1, ARF6, PKCalpha, or PKCbeta translocation. However, in intact PMNs stimulated with N-formyl-1-methionyl-1-leucyl-1-phenylalamine (FMLP) or permeabilized PMNs stimulated with GTPgammaS, C2-ceramide did not inhibit RhoA translocation. Exogenous RhoA did not restore ceramide-inhibited PLD activity but bound to membranes despite ceramide treatment. These observations suggest that, although ceramide may affect RhoA in some systems, ceramide inhibits PLD through another mechanism, perhaps related to the ability of ceramide to inhibit phosphatidylinositol-bisphosphate (PIP2) interaction with PLD. (C) 2004 by The American Society of Hematology.
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收藏
页码:2363 / 2368
页数:6
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