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*
复制标题
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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复制
发表时间:
1997
影响因子:
4.8
通讯作者:
A. Roshak
中科院分区:
文献类型:
--
作者:
L. Marshall;B. Bolognese;J. Winkler;A. Roshak
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.
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DOI:
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发表时间:
1994
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Bartoli,F;Lin,HK;Ghomashchi,F;Gelb,MH;Jain,MK;Apitz-Castro,R
通讯作者:
Apitz-Castro,R
影响因子:
3.1
作者:
Peters-Golden,M;McNish,RW
通讯作者:
McNish,RW
DOI:
--
发表时间:
1993
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Barbour,SE;Dennis,EA
通讯作者:
Dennis,EA
DOI:
10.1042/bj2860497
发表时间:
1992
期刊:
The Biochemical journal
影响因子:
--
作者:
Triggiani,M;Fonteh,AN;Chilton,FH
通讯作者:
Chilton,FH
DOI:
--
发表时间:
1995
期刊:
The Journal of pharmacology and experimental therapeutics
影响因子:
--
作者:
Winkler,JD;Fonteh,AN;Sung,CM;Heravi,JD;Nixon,AB;Chabot-Fletcher,M;Griswold,D;Marshall,LA;Chilton,FH
通讯作者:
Chilton,FH