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大学・研究所にある論文を検索できる 「Functional role of phosphatidylcholine-specific phospholipase C in regulating leukotriene synthesis and degranulation in human eosinophils」の論文概要。リケラボ論文検索は、全国の大学リポジトリにある学位論文・教授論文を一括検索できる論文検索サービスです。
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Functional role of phosphatidylcholine-specific phospholipase C in regulating leukotriene synthesis and degranulation in human eosinophils

佐野 安希子 近畿大学

2022.02.28

概要

Phosphatidylinositol-specific phospholipase C (PI-PLC) and cytosolic phospholipase A2 (cPLA2) regulate both eosinophil degranulation and leukotriene (LT) synthesis via PI-PLC-mediated calcium influx and cPLA2 activa- tion. Phosphatidylcholine-specific phospholipase C (PC-PLC) likely plays a key role in cellular signaling, including the eosinophilic allergic inflammatory response. This study examined the role of PC-PLC in eosinophil LT synthesis and degranulation using tricyclodecan-9-yl-xanthogenate (D609), a PC-specific PLC inhibitor. D609 inhibited N-formyl-met-leu-phe + cytochalasin B (fMLP/B)-induced arachidonic acid (AA) release and leuko- triene C4 (LTC4) secretion. However, at concentrations that blocked both AA release and LTC4 secretion, D609 had no significant inhibitory effect on stimulated cPLA2 activity. D609 also partially blocked fMLP/B-induced calcium influx, indicating that inhibition of AA release and LTC4 secretion by D609 is due to inhibition of calcium-mediated cPLA2 translocation to intracellular membranes, not inhibition of cPLA2 activity. In addition, D609 inhibited fMLP/B-stimulated eosinophil peroxidase release, indicating that PC-PLC regulates fMLP/B- induced eosinophil degranulation by increasing the intracellular calcium concentration ([Ca2+]i). Overall, our results showed that PC-PLC is critical for fMLP/B-stimulated eosinophil LT synthesis and degranulation. In addition, degranulation requires calcium influx, while PC-PLC regulates LTC4 synthesis through calcium- mediated cPLA2 activation.

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