Different signaling pathway between sphingosine-1-phosphate and lysophosphatidic acid in Xenopus oocytes: functional coupling of the sphingosine-1-phosphate receptor to PLC-xbeta in Xenopus oocytes

Journal of Cellular Physiology
S J NohJ K Han

Abstract

In Xenopus oocytes, both sphingosine-1-phosphate (S1P) and lysophosphatidic acid (LPA) activate Ca2+-dependent oscillatory Cl- currents by acting through membrane-bound receptors. External application of 50 microM S1P elicited a long-lasting oscillatory current that continued over 30 min from the beginning of oscillation, with 300 nA (n = 11) as a usual maximum peak of current, whereas 1-microM LPA treatment showed only transiently oscillating but more vigorous current responses, with 2,800 nA (n = 18) as a maximum peak amplitude. Both phospholipid-induced Ca2+-dependent Cl- currents were observed in the absence of extracellular Ca2+, were blocked by intracellular injection of the Ca2+ chelator, EGTA, and could not be elicited by treatment with thapsigargin, an inhibitor of endoplasmic reticulum (ER) Ca2+ ATPase. Intracellular Ca2+ release appeared to be from inositol 1,4,5-trisphosphate (IP3)-sensitive Ca2+ store, because Cl- currents were blocked by heparin injection. Pretreatment with the aminosteroid, U-73122, an inhibitor of G protein-mediated phospholipase C (PLC) activation, to oocytes inhibited the current responses evoked both by S1P and LPA. However, when they were injected with 10 ng of antisense oligonucleotide (AS-...Continue Reading

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Citations

Jun 8, 2011·Pflügers Archiv : European journal of physiology·Patthara KongsupholKarl Kunzelmann
Mar 1, 2013·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Angelo Demuro, Ian Parker
Jan 21, 2017·Progress in Lipid Research·S Rodriguez-CuencaA Vidal-Puig
Dec 3, 2002·Anesthesiology·Markus W HollmannMarcel E Durieux
Jul 23, 2002·The Journal of Biological Chemistry·Michael J CoadyJean-Yves Lapointe
Jul 17, 2007·Journal of Neurochemistry·Chien-Yuan PanYit-Tsong Chen
Aug 22, 2002·The Journal of Eukaryotic Microbiology·Shulin WangYoshinori Nozawa
Mar 31, 2010·The Journal of Physiology·Juan Martinez-PinnaAndrés Morales
Mar 4, 2000·The Journal of Biological Chemistry·K L Németh-Cahalan, J E Hall

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