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http://dx.doi.org/10.5352/JLS.2003.13.6.903

Effects of Protein Kinase G on Phospholipase D Activity of Human Neutrophils  

박지연 (동아대학교 의과대학 생화학교실)
이민정 (동아대학교 암분자치료연구센터)
장민정 (동아대학교 암분자치료연구센터)
이선영 (동아대학교 의과대학 생화학교실)
배외식 (동아대학교 의과대학 생화학교실)
곽종영 (동아대학교 암분자치료연구센터)
Publication Information
Journal of Life Science / v.13, no.6, 2003 , pp. 903-910 More about this Journal
Abstract
Phospholipase D (PLD) plays an important role as a signaling molecule in the activation of neutrophils. In this study, effect of nitric oxide (NO) and cGMP on the activation of PLD in human neutrophils was investigated. Sodium nitroprusside (SNP), an agent to produce NO spontaneously in cells, alone increased PLD activity and the maximal activation was obtained with 0.5 mM SNP. Dibutyryl-cAMP, an agent to increase an intracellular cAMP concentration inhibited formyl-Met-Leu-Phe (fMLP)-stimulated PLD activity but 8-bromo-cGMP (300 $\mu$M), an agent to increase an intracellular cGMP concentration did not affect basal and fMLP-stimulated PLD activity. NO-induced activation of PLD was not blocked by KT 5823, an inhibitor of cGMP-dependent protein kinase (PKG), suggesting that NO-induced PLD activation is not mediated by cGMP. NO also stimulated p38 mitogen activated protein kinase (MAPK) in human neutrophils, indicated by increased phosphorylation of p38 MAPK in Western blotting. NO-induced phosphorylation of p38 MAPK was not inhibited by KT 5823 or n-butanol. RhoA, an regulatory factor of PLD activation was trans-located from cytosolic fraction to plasma membranes by fMLP or phorbol ester, and fMLP-stimulated but not phorbol ester-stimulated translocation of RhoA was inhibited by cGMP. These results suggest that NO stimulates PLD activity through other unidentified facto.(s) than cGMP even though cGMP inhibits the artivation of RhoA.
Keywords
Neutrophils; phospholipase D; nitric oxide; cGMP; RhoA; protein kinase G;
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