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Effects of sphingosine-1-phosphate on pacemaker activity of interstitial cells of Cajal from mouse small intestine

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Molecules and Cells

Abstract

Interstitial cells of Cajal (ICC) are the pacemaker cells that generate the rhythmic oscillation responsible for the production of slow waves in gastrointestinal smooth muscle. Spingolipids are known to present in digestive system and are responsible for multiple important physiological and pathological processes. In this study, we are interested in the action of sphingosine 1-phosphate (S1P) on ICC. S1P depolarized the membrane and increased tonic inward pacemaker currents. FTY720 phosphate (FTY720P, an S1P1,3,4,5 agonist) and SEW 2871 (an S1P1 agonist) had no effects on pacemaker activity. Suramin (an S1P3 antagonist) did not block the S1P-induced action on pacemaker currents. However, JTE-013 (an S1P2 antagonist) blocked the S1P-induced action. RT-PCR revealed the presence of the S1P2 in ICC. Calphostin C (a protein kinase C inhibitor), NS-398 (a cyclooxygenase-2 inhibitor), PD 98059 (a p42/44 inhibitor), or SB 203580 (a p38 inhibitor) had no effects on S1P-induced action. However, c-jun NH2-terminal kinase (JNK) inhibitor II suppressed S1P-induced action. External Ca2+-free solution or thapsigargin (a Ca2+-ATPase inhibitor of endoplasmic reticulum) suppressed action of S1P on ICC. In recording of intracellular Ca2+ ([Ca2+]i) concentration using fluo-4/AM S1P increased intensity of spontaneous [Ca2+]i oscillations in ICC. These results suggest that S1P can modulate pacemaker activity of ICC through S1P2 via regulation of external and internal Ca2+ and mitogenactivated protein kinase activation.

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Authors and Affiliations

  1. Department of Physiology, Chosun University, Gwangju, 501-759, Korea

    Pawan Kumar Shahi, Dong Chuan Zuo, Seok Choi & Jae Yeoul Jun

  2. Department of Internal Medicine, College of Medicine, Chosun University, Gwangju, 501-759, Korea

    Young Dae Kim, Kyoung Taek Han, Jun Lee, Chan Guk Park & Man Yoo Kim

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  1. Young Dae Kim
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  2. Kyoung Taek Han
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  3. Jun Lee
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  4. Chan Guk Park
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  5. Man Yoo Kim
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  6. Pawan Kumar Shahi
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  7. Dong Chuan Zuo
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  8. Seok Choi
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  9. Jae Yeoul Jun
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Correspondence to Jae Yeoul Jun.

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Kim, Y.D., Han, K.T., Lee, J. et al. Effects of sphingosine-1-phosphate on pacemaker activity of interstitial cells of Cajal from mouse small intestine. Mol Cells 35, 79–86 (2013). https://doi.org/10.1007/s10059-013-2282-0

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  • DOI: https://doi.org/10.1007/s10059-013-2282-0

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