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• W2007232484 abstract "Lysophosphatidylcholine (LPC) is an important bioactive lipid. In the nervous system, elevated levels of LPC have been shown to produce demyelination. In the present study, we examined the effect of exogenous LPC on intracellular Ca2+ mobilization in human neuroblastoma SH-SY5Y cells. In Ca2+-containing medium, introduction of LPC induced a steady rise in cytosolic Ca2+ levels ([Ca2+]i) in a dose-dependent manner, and this rise was provoked by LPC itself, not by its hydrolysis product produced by lysophospholipase. The increase in [Ca2+]i was reduced by 36% by removal of extracellular Ca2+, while preincubation of the cells with verapamil, an L-type Ca2+ channel blocker, inhibited the response by 23%, part of the Ca2+ influx. Conversely, Ni2+, which inhibits the Na+-Ca2+ exchanger, or Na+-deprivation did not affect LPC-induced Ca2+ influx. In Ca2+-free medium, depletion of Ca2+ stores in the endoplasmic reticulum (ER) by thapsigargin, an ER Ca2+-ATPase inhibitor, abolished the Ca2+ increase. Moreover, LPC-induced [Ca2+]i increase was fully blocked by ruthenium red and procaine, inhibitors of ryanodine receptor (RyR), but was not affected by 2-aminoethoxydiphenyl borate, an inhibitor of inositol triphosphate receptor, or by pertussis toxin, a G(i/o) protein inhibitor. Combined treatment with verapamil plus thapsigargin markedly inhibited but did not abolish the LPC-induced Ca2+ response. These findings indicate that LPC-induced [Ca2+]i increase depends on both external Ca2+ influx and Ca2+ release from ER Ca2+ stores, in which L-type Ca2+ channels and RyRs may be involved. However, in digitonin-permeabilized SH-SY5Y cells, LPC could not induce any [Ca2+]i increase in Ca2+-free medium, suggesting that LPC may act indirectly on RyRs of ER." @default.
• W2007232484 created "2016-06-24" @default.
• W2007232484 creator A5071814939 @default.
• W2007232484 creator A5080681903 @default.
• W2007232484 date "2007-02-01" @default.
• W2007232484 modified "2023-09-27" @default.
• W2007232484 title "Characteristics of lysophosphatidylcholine-induced Ca2+ response in human neuroblastoma SH-SY5Y cells" @default.
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• W2007232484 doi "https://doi.org/10.1016/j.lfs.2006.11.017" @default.
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