Sphingosine 1-phosphate induces Ca2+ transients and cytoskeletal rearrangement in C2C12 myoblastic cells

Formigli, L. et al. (2002) Sphingosine 1-phosphate induces Ca2+ transients and cytoskeletal rearrangement in C2C12 myoblastic cells. American Journal of Physiology: Cell Physiology, 282(6), C1361-C1373. (doi: 10.1152/ajpcell.00378.2001) (PMID:11997251)

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In many cell systems, sphingosine 1-phosphate (SPP) increases cytosolic Ca2+concentration ([Ca2+]i) by acting as intracellular mediator and extracellular ligand. We recently demonstrated (Meacci E, Cencetti F, Formigli L, Squecco R, Donati C, Tiribilli B, Quercioli F, Zecchi-Orlandini S, Francini F, and Bruni P. Biochem J 362: 349–357, 2002) involvement of endothelial differentiation gene (Edg) receptors (Rs) specific for SPP in agonist-mediated Ca2+ response of a mouse skeletal myoblastic (C2C12) cell line. Here, we investigated the Ca2+ sources of SPP-mediated Ca2+ transients in C2C12 cells and the possible correlation of ion response to cytoskeletal rearrangement. Confocal fluorescence imaging of C2C12 cells preloaded with Ca2+ dye fluo 3 revealed that SPP elicited a transient Ca2+ increase propagating as a wave throughout the cell. This response required extracellular and intracellular Ca2+ pool mobilization. Indeed, it was significantly reduced by removal of external Ca2+, pretreatment with nifedipine (blocker of L-type plasma membrane Ca2+channels), and inositol 1,4,5-trisphosphate [Ins(1,4,5)P3]-mediated Ca2+pathway inhibitors. Involvement of EdgRs was tested with suramin (specific inhibitor of Edg-3). Fluorescence associated with Ins(1,4,5)P3Rs and L-type Ca2+channels was evident in C2C12 cells. SPP also induced C2C12 cell contraction. This event, however, was unrelated to [Ca2+]i increase, because the two phenomena were temporally shifted. We propose that SPP may promote C2C12 cell contraction through Ca2+-independent mechanisms.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Vassalli, Professor Massimo
Authors: Formigli, L., Francini, F., Meacci, E., Vassalli, M., Nosi, D., Quercioli, F., Tiribilli, B., Bencini, C., Piperio, C., Bruni, P., and Zecchi Orlandini, S.
College/School:College of Science and Engineering > School of Engineering > Biomedical Engineering
Journal Name:American Journal of Physiology: Cell Physiology
Publisher:American Physiological Society
ISSN (Online):1522-1563

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