Depletion of Human Monocyte 85-kDa Phospholipase A2 Does Not Alter Leukotriene Formation*

Depletion of Human Monocyte 85-kDa Phospholipase A2 Does Not Alter Leukotriene Formation*
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人类单核细胞 85-kDa 磷脂酶 A2 的消耗不会改变白三烯的形成*

DOI:
--
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发表时间:
1997
影响因子:
4.8
通讯作者:
A. Roshak
A. Roshak
中科院分区:
生物学2区
文献类型:
--
作者:
L. Marshall;B. Bolognese;J. Winkler;A. Roshak

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人单核细胞具有多种酰基水解酶活性,在钙离子载体、A23187或吞噬酶蛋白颗粒的急性刺激下,能够产生前列腺素(PG)和白三烯(LT)产物。胞质85-kDa磷脂酶(PLA) A2与14-kDa PLA2在人单核细胞中共存,但它们各自在LT产生中的作用尚不清楚。通过起始位点定向反义(SK 7111)或暴露于85-kDa PLA2抑制剂花生四烯基三氟甲基酮(AACOCF3)降低85-kDa PLA2细胞蛋白水平,可阻止A23187或酶酶酶刺激的单核细胞前列腺素形成。相比之下,两种处理都没有改变受刺激的LTC4产量。这证实了85-kDa PLA2在前列腺素形成中的重要作用,但表明它在LT生物合成中的作用较小。另外,在刺激前用选择性的、活性位点定向的14-kDa PLA2抑制剂SB 203347处理单核细胞,在完全抑制LT形成的浓度下,对前列腺素的形成没有影响。在暴露于SK 7111或SB 203347的单核细胞中添加20 μM外源花生四烯酸并没有分别改变a23187诱导的PGE2或LTC4的生成,这表明在这种情况下,这些药物对下游花生四烯酸代谢酶没有影响。综上所述,这些结果证明85-kDa的PLA2可能在PG的形成中发挥比LT更重要的作用。此外,利用SB 203347提供了有趣的数据,形成了一个假设,即非85-kDa的PLA2 sn-2酰基水解酶,可能是14-kDa的PLA2,可能为LT的形成提供底物。
Human monocytes possess several acylhydrolase activities and are capable of producing both prostanoids (PG) and leukotriene (LT) products upon acute stimulation with calcium ionophore, A23187 or phagocytosis of zymosan particles. The cytosolic 85-kDa phospholipase (PLA) A2 co-exists with the 14-kDa PLA2 in the human monocyte, but their respective roles in LT production are not well understood. Reduction in 85-kDa PLA2 cellular protein levels by initiation site-directed antisense (SK 7111) or exposure to the 85-kDa PLA2 inhibitor, arachidonyl trifluoromethyl ketone (AACOCF3), prevented A23187 or zymosan-stimulated monocyte prostanoid formation. In contrast, neither treatment altered stimulated LTC4 production. This confirmed the important role of the 85-kDa PLA2 in prostanoid formation but suggests that it has less of a role in LT biosynthesis. Alternatively, treatment of monocytes with the selective, active site-directed 14-kDa PLA2 inhibitor, SB 203347, prior to stimulation had no effect on prostanoid formation at concentrations that totally inhibited LT formation. Addition of 20 μM exogenous arachidonic acid to monocytes exposed to SK 7111 or SB 203347 did not alter A23187-induced PGE2 or LTC4 generation, respectively, indicating that these agents had no effect on downstream arachidonic acid-metabolizing enzymes in this setting. Taken together, these results provide evidence that the 85-kDa PLA2 may play a more significant role in the formation of PG than LT. Further, utilization of SB 203347 provides intriguing data to form the hypothesis that a non-85-kDa PLA2 sn-2 acyl hydrolase, possibly the 14-kDa PLA2, may provide substrate for LT formation.
85-kDa 磷脂酶 A2 的紧密结合抑制剂(而非 14-kDa 磷脂酶 A2)可抑制凝血酶刺激的人血小板中游离花生四烯酸的释放。
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