Dioeloyl phosphatidic acid induces morphological changes through an endogenous LPA receptor in C6 glioma cells
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Abstract
Previously, we suggested that dioleoyl phosphatidic acid (PA) and lysophosphatidic acid (LPA) increased [Ca2+]i through endogenous LPA receptors coupled to pertussis toxin-sensitive G proteins in rat C6 glioma cells. In the present report, we investigated morphological changes and cytotoxicity induced by PA and LPA in C6 glioma cells. Isoproterenol treatment led to changes in the cell morphology of rat C6 glioma cells, which were reverted by the addition of PA and LPA. PA-and LPA-induced morphological reversions were inhibited by treatment with Ki16425, an LPA1/LPA3 receptor antagonist. VPC32183, another LPA1/LPA3 receptor antagonist with a different structure, only inhibited PA-induced morphological reversion but not LPA-induced reversion. However, the reversions were not inhibited by treatment with pertussis toxin, a specific inhibitor of Gi/o proteins. In addition, cytotoxicity was only induced by LPA but not by PA in C6 glioma cells. Our results suggest that PA may act as a partial agonist at endogenous LPA receptors, which are sensitive to Ki16425 and coupled to PTX-insensitive G proteins, to evoke morphological changes in C6 glioma cells.
Key words
Phosphatidic acid Lysophosphatidic acid G-Protein-coupled receptor Cell shape LPA1 LPA3Abbreviations
- PA
dioleoyl phosphatidic acid
- LPA
lysophosphatidic acid
- VPC32183
(S)-Phosphoric acid mono-{2-octadec-9-enoylamino-3-[4-(pyridine-2-ylmethoxy)-phenyl]-propyl} ester
- Ki16425
3-(4-[4-([1-(2-Chlorophenyl)ethoxy]carbonylamino)-3-methyl-5-isoxazolyl]benzylthio) propanoic acid
- PTX
pertussis toxin
- GPCR
G-protein-coupled receptor
- LPA1
lysophosphatidic acid receptor type 1 (EDG2)
- LPA2
lysophosphatidic acid receptor type 2 (EDG4)
- LPA3
lysophosphatidic acid receptor 3 (EDG7)
- LPA4
lysophosphatidic acid receptor type 4 (GPR23)
- LPA5
lysophosphatidic acid receptor 5 (GPR92)
- PLD
phospholipase D
- PLA2
phospholipase A2
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References
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