Sphingosine 1-phosphate increases an intracellular Ca(2+) concentration via S1P3 receptor in cultured vascular smooth muscle cells
We investigated the effect of sphingosine 1-phosphate (S1P) on intracellular Ca(2+) dynamics in rat vascular smooth muscle cells (VSMCs). Intracellular Ca(2+) concentration ([Ca(2+) ]i) was determined using a fluorescence dye fura-2/AM. Small interfering RNAs (siRNA) were transfected into VSMCs to d...
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Published in | Journal of pharmacy and pharmacology Vol. 66; no. 6; p. 802 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
England
01.06.2014
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Abstract | We investigated the effect of sphingosine 1-phosphate (S1P) on intracellular Ca(2+) dynamics in rat vascular smooth muscle cells (VSMCs).
Intracellular Ca(2+) concentration ([Ca(2+) ]i) was determined using a fluorescence dye fura-2/AM. Small interfering RNAs (siRNA) were transfected into VSMCs to deplete the expression of S1P2 and S1P3 receptors.
S1P induced a rapid and transient elevation in [Ca(2+) ]i, which was maximal 1 min after the stimulation, followed by a sustained increase. When extracellular Ca(2+) was removed, a decrease in resting level and a small and transient increase in [Ca(2+) ]i by S1P stimulation were observed. siRNA targeted for the S1P3 receptor almost completely inhibited the S1P-induced increase in [Ca(2+) ]i. The rapid and transient increase in [Ca(2+) ]i was significantly inhibited by diltiazem at a high concentration. Pertussis toxin and a phospholipase C (PLC) inhibitor inhibited the S1P-induced increase in [Ca(2+) ]i regardless of the presence of extracellular Ca(2+) . Furthermore, S1P activated store-operated and receptor-operated Ca(2+) entry.
These results suggest that S1P increases [Ca(2+) ]i via the S1P3 receptor by inducing an influx of extracellular Ca(2+) partially through the voltage-dependent Ca(2+) channels, as well as by mobilizing Ca(2+) from its intracellular stores. S1P3 receptor-coupled Gi/o protein and PLC activation mediate the mechanisms. |
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AbstractList | We investigated the effect of sphingosine 1-phosphate (S1P) on intracellular Ca(2+) dynamics in rat vascular smooth muscle cells (VSMCs).
Intracellular Ca(2+) concentration ([Ca(2+) ]i) was determined using a fluorescence dye fura-2/AM. Small interfering RNAs (siRNA) were transfected into VSMCs to deplete the expression of S1P2 and S1P3 receptors.
S1P induced a rapid and transient elevation in [Ca(2+) ]i, which was maximal 1 min after the stimulation, followed by a sustained increase. When extracellular Ca(2+) was removed, a decrease in resting level and a small and transient increase in [Ca(2+) ]i by S1P stimulation were observed. siRNA targeted for the S1P3 receptor almost completely inhibited the S1P-induced increase in [Ca(2+) ]i. The rapid and transient increase in [Ca(2+) ]i was significantly inhibited by diltiazem at a high concentration. Pertussis toxin and a phospholipase C (PLC) inhibitor inhibited the S1P-induced increase in [Ca(2+) ]i regardless of the presence of extracellular Ca(2+) . Furthermore, S1P activated store-operated and receptor-operated Ca(2+) entry.
These results suggest that S1P increases [Ca(2+) ]i via the S1P3 receptor by inducing an influx of extracellular Ca(2+) partially through the voltage-dependent Ca(2+) channels, as well as by mobilizing Ca(2+) from its intracellular stores. S1P3 receptor-coupled Gi/o protein and PLC activation mediate the mechanisms. |
Author | Hirafuji, Masahiko Machida, Takuji Fujii, Kazumi Iizuka, Kenji |
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BackLink | https://www.ncbi.nlm.nih.gov/pubmed/24450400$$D View this record in MEDLINE/PubMed |
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Keywords | S1P3 receptor sphingosine 1-phosphate vascular smooth muscle cells L-type voltage-dependent Ca2+ channel intracellular Ca2+ concentration |
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Snippet | We investigated the effect of sphingosine 1-phosphate (S1P) on intracellular Ca(2+) dynamics in rat vascular smooth muscle cells (VSMCs).
Intracellular Ca(2+)... |
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SubjectTerms | Animals Calcium - metabolism Calcium Channels, L-Type - physiology Cells, Cultured Fingolimod Hydrochloride Lysophospholipids - pharmacology Muscle, Smooth, Vascular - cytology Muscle, Smooth, Vascular - metabolism Myocytes, Smooth Muscle - metabolism Propylene Glycols - pharmacology Rats Rats, Wistar Receptors, Lysosphingolipid - physiology Sphingosine - analogs & derivatives Sphingosine - pharmacology |
Title | Sphingosine 1-phosphate increases an intracellular Ca(2+) concentration via S1P3 receptor in cultured vascular smooth muscle cells |
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