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• W1999367048 abstract "GPR34 is a G protein-coupled receptor belonging to the P2Y family. Here, we attempted to resolve conflicting reports about whether it is a functional lysophosphatidylserine (LysoPS) receptor. In HEK293 cells expressing human, mouse or rat GPR34 and Gα chimera between Gαq and Gαi1(Gq/i1), LysoPS quickly elevated intracellular Ca2+ ion levels ([Ca2+]i). LysoPS also stimulated alkaline phosphatase (AP)-tagged TGFα (AP-TGFα) release in GPR34-expressing HEK293 cells and induced the migration of CHO-K1 cells expressing GPR34. Other lysophospholipids did not induce these actions. Replacement of the serine residue of LysoPS abolished the reactivity of LysoPS with GPR34, indicating that GPR34 strictly recognizes the serine head group of LysoPS. Recombinant phosphatidylserine-specific phospholipase A1 (PS-PLA1) that deacylates fatty acid at the sn-1 position of PS and produces 2-acyl-LysoPS, but not catalytically inactive mutant PS-PLA1, stimulated the release of AP-TGFα from GPR34-expressing cells. Consistent with the result, LysoPS was detected in the cells treated with wild-type PS-PLA1 but not with the mutant PS-PLA1. PS treated with PLA1 was much more effective at stimulating AP-TGFα release than PS treated with PLA2. In addition, migration-resistant 2-acyl-1-deoxy-LysoPS, a 2-acyl-LysoPS analogue, was much more potent than 1-acyl-2-deoxy-LysoPS. The present studies confirm that GPR34 is a cellular receptor for LysoPS, especially with a fatty acid at the sn-2 position." @default.
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• W1999367048 date "2012-02-16" @default.
• W1999367048 modified "2023-09-30" @default.
• W1999367048 title "GPR34 is a receptor for lysophosphatidylserine with a fatty acid at the sn-2 position" @default.
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• W1999367048 doi "https://doi.org/10.1093/jb/mvs011" @default.
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