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Sphingosine-1-phosphate enhances satellite cell activation in dystrophic muscles through a S1PR2/STAT3 signaling pathway.
PLoS One. 2012; 7(5):e37218.Plos

Abstract

Sphingosine-1-phosphate (S1P) activates a widely expressed family of G protein-coupled receptors, serves as a muscle trophic factor and activates muscle stem cells called satellite cells (SCs) through unknown mechanisms. Here we show that muscle injury induces dynamic changes in S1P signaling and metabolism in vivo. These changes include early and profound induction of the gene encoding the S1P biosynthetic enzyme SphK1, followed by induction of the catabolic enzyme sphingosine phosphate lyase (SPL) 3 days later. These changes correlate with a transient increase in circulating S1P levels after muscle injury. We show a specific requirement for SphK1 to support efficient muscle regeneration and SC proliferation and differentiation. Mdx mice, which serve as a model for muscular dystrophy (MD), were found to be S1P-deficient and exhibited muscle SPL upregulation, suggesting that S1P catabolism is enhanced in dystrophic muscle. Pharmacological SPL inhibition increased muscle S1P levels, improved mdx muscle regeneration and enhanced SC proliferation via S1P receptor 2 (S1PR2)-dependent inhibition of Rac1, thereby activating Signal Transducer and Activator of Transcription 3 (STAT3), a central player in inflammatory signaling. STAT3 activation resulted in p21 and p27 downregulation in a S1PR2-dependent fashion in myoblasts. Our findings suggest that S1P promotes SC progression through the cell cycle by repression of cell cycle inhibitors via S1PR2/STAT3-dependent signaling and that SPL inhibition may provide a therapeutic strategy for MD.

Authors+Show Affiliations

Children's Hospital Oakland Research Institute, Oakland, California, United States of America.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, N.I.H., Extramural
Research Support, N.I.H., Intramural
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22606352

Citation

Loh, Kenneth C., et al. "Sphingosine-1-phosphate Enhances Satellite Cell Activation in Dystrophic Muscles Through a S1PR2/STAT3 Signaling Pathway." PloS One, vol. 7, no. 5, 2012, pp. e37218.
Loh KC, Leong WI, Carlson ME, et al. Sphingosine-1-phosphate enhances satellite cell activation in dystrophic muscles through a S1PR2/STAT3 signaling pathway. PLoS One. 2012;7(5):e37218.
Loh, K. C., Leong, W. I., Carlson, M. E., Oskouian, B., Kumar, A., Fyrst, H., Zhang, M., Proia, R. L., Hoffman, E. P., & Saba, J. D. (2012). Sphingosine-1-phosphate enhances satellite cell activation in dystrophic muscles through a S1PR2/STAT3 signaling pathway. PloS One, 7(5), e37218. https://doi.org/10.1371/journal.pone.0037218
Loh KC, et al. Sphingosine-1-phosphate Enhances Satellite Cell Activation in Dystrophic Muscles Through a S1PR2/STAT3 Signaling Pathway. PLoS One. 2012;7(5):e37218. PubMed PMID: 22606352.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Sphingosine-1-phosphate enhances satellite cell activation in dystrophic muscles through a S1PR2/STAT3 signaling pathway. AU - Loh,Kenneth C, AU - Leong,Weng-In, AU - Carlson,Morgan E, AU - Oskouian,Babak, AU - Kumar,Ashok, AU - Fyrst,Henrik, AU - Zhang,Meng, AU - Proia,Richard L, AU - Hoffman,Eric P, AU - Saba,Julie D, Y1 - 2012/05/14/ PY - 2011/12/20/received PY - 2012/04/15/accepted PY - 2012/5/19/entrez PY - 2012/5/19/pubmed PY - 2012/10/17/medline SP - e37218 EP - e37218 JF - PloS one JO - PLoS One VL - 7 IS - 5 N2 - Sphingosine-1-phosphate (S1P) activates a widely expressed family of G protein-coupled receptors, serves as a muscle trophic factor and activates muscle stem cells called satellite cells (SCs) through unknown mechanisms. Here we show that muscle injury induces dynamic changes in S1P signaling and metabolism in vivo. These changes include early and profound induction of the gene encoding the S1P biosynthetic enzyme SphK1, followed by induction of the catabolic enzyme sphingosine phosphate lyase (SPL) 3 days later. These changes correlate with a transient increase in circulating S1P levels after muscle injury. We show a specific requirement for SphK1 to support efficient muscle regeneration and SC proliferation and differentiation. Mdx mice, which serve as a model for muscular dystrophy (MD), were found to be S1P-deficient and exhibited muscle SPL upregulation, suggesting that S1P catabolism is enhanced in dystrophic muscle. Pharmacological SPL inhibition increased muscle S1P levels, improved mdx muscle regeneration and enhanced SC proliferation via S1P receptor 2 (S1PR2)-dependent inhibition of Rac1, thereby activating Signal Transducer and Activator of Transcription 3 (STAT3), a central player in inflammatory signaling. STAT3 activation resulted in p21 and p27 downregulation in a S1PR2-dependent fashion in myoblasts. Our findings suggest that S1P promotes SC progression through the cell cycle by repression of cell cycle inhibitors via S1PR2/STAT3-dependent signaling and that SPL inhibition may provide a therapeutic strategy for MD. SN - 1932-6203 UR - https://www.unboundmedicine.com/medline/citation/22606352/Sphingosine_1_phosphate_enhances_satellite_cell_activation_in_dystrophic_muscles_through_a_S1PR2/STAT3_signaling_pathway_ L2 - https://dx.plos.org/10.1371/journal.pone.0037218 DB - PRIME DP - Unbound Medicine ER -