title: Sphingosine 1-phosphate stimulates proliferation and migration of satellite cells: role of S1P receptors.
abstract: Satellite cells are resident stem cells of skeletal muscle; they are normally quiescent but upon post-trauma activation start to proliferate and fuse with damaged fibers contributing to muscle regeneration. In this study the effect of the bioactive sphingolipid sphingosine 1-phosphate (S1P) on the proliferative and migratory response of murine satellite cells has been examined. S1P was found to stimulate labeled thymidine incorporation in a phosphatidylinositol 3-kinase-dependent manner. Moreover, by employing selective S1P receptor agonists and antagonists and silencing individual S1P receptors, the mitogenic action of S1P in satellite cells was shown to depend on S1P2 and S1P3. Notably, by using different experimental approaches S1P was found to positively influence satellite cell migration, necessary for their recruitment at the site of muscle damage. Interestingly, the specific silencing of individual S1P receptor subtypes demonstrated the pivotal role of S1P1 and S1P4 in mediating the S1P migratory effect. This latter result demonstrates for the first time that S1P4 receptor has a role in skeletal muscle cells, supporting the notion that this receptor subtype plays a biological action broader than that so far identified in lymphoid tissue. On the contrary, S1P2 was found to negatively regulate cell migration. Collectively, these results are in favour of an important function of S1P in satellite cell biology that could in principle be exploited as novel pharmacological target for improving skeletal muscle regeneration.
authors.affiliation: Dipartimento di Scienze Biochimiche, Università di Firenze, 50134 Firenze, Italy.
authors.forename: Serena
authors.initials: S
authors.lastname: Calise
authors.forename: Sabrina
authors.initials: S
authors.lastname: Blescia
authors.forename: Francesca
authors.initials: F
authors.lastname: Cencetti
authors.forename: Caterina
authors.initials: C
authors.lastname: Bernacchioni
authors.forename: Chiara
authors.initials: C
authors.lastname: Donati
authors.forename: Paola
authors.initials: P
authors.lastname: Bruni
mesh_terms: D000818:Animals; D002465:Cell Movement / Q000187:drug effects*; D049109:Cell Proliferation / Q000187:drug effects*; D002478:Cells, Cultured; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism; D006801:Humans; D008246:Lysophospholipids / Q000378:metabolism / Q000494:pharmacology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D020033:Protein Isoforms / Q000235:genetics / Q000378:metabolism*; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D049349:Receptors, Lysosphingolipid / Q000235:genetics / Q000378:metabolism*; D032496:Satellite Cells, Skeletal Muscle / Q000166:cytology / Q000187:drug effects* / Q000502:physiology*; D015398:Signal Transduction / Q000502:physiology; D013110:Sphingosine / Q000031:analogs & derivatives* / Q000378:metabolism / Q000494:pharmacology; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism
chemical_list: D008246:Lysophospholipids; D020033:Protein Isoforms; D049349:Receptors, Lysosphingolipid; C060506:sphingosine 1-phosphate; D051057:Proto-Oncogene Proteins c-akt; D048049:Extracellular Signal-Regulated MAP Kinases; D048051:p38 Mitogen-Activated Protein Kinases; D013110:Sphingosine