Phosphatidylserine-specific Phospholipase A1Stimulates Histamine Release from Rat Peritoneal Mast Cells through Production of 2-Acyl-1-lysophosphatidylserine (original) (raw)

Abstract

Lysophosphatidylserine (1-acyl-2-lyso-PS) has been shown to stimulate histamine release from rat peritoneal mast cells (RPMC) triggered by Fc⑀RI (high affinity receptor for IgE) cross-linking, although the precise mechanism of lyso-PS production has been obscure. In the present study we show that phosphatidylserine-specific phospholipase A 1 , PS-PLA 1 , stimulates histamine release from RPMC through production of 2-acyl-1lyso-PS in the presence of Fc⑀RI cross-linker. The potency of 2-acyl-1-lyso-PS was almost equal to that of 1-acyl-2-lyso-PS. A catalytically inactive PS-PLA 1 , in which an active serine residue (Ser 166) was replaced with an alanine residue did not show such activity. sPLA 2-IIA, another secretory PLA 2 that is capable of producing lyso-PS in vitro, was also a poor histamine inducer against RPMC. PS-PLA 1 significantly stimulated histamine release from crude RPMC, indicating that lyso-PS is mainly derived from cells other than mast cells. In agreement with this phenomenon, the enzyme stimulated the histamine release more efficiently when RPMC were mixed with apoptotic Jurkat cells. Under these conditions, lyso-PS with unsaturated fatty acid was released from the apoptotic cells treated with PS-PLA 1. Finally, heparin, which has affinity for PS-PLA 1 , completely blocked the stimulatory effect of the enzyme. In conclusion, PS-PLA 1 may bind to heparan sulfate proteoglycan, efficiently hydrolyze PS appearing on plasma membranes of apoptotic cells, and stimulate mast cell activation mediated by 2-acyl-1-lyso-PS.

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