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Bernacchioni C, Squecco R, Gamberi T, Ghini V, Schumacher F, Mannelli M, Garella R, Idrizaj E, Cencetti F, Puliti E, Bruni P, Turano P, Fiaschi T, Donati C. S1P Signalling Axis Is Necessary for Adiponectin-Directed Regulation of Electrophysiological Properties and Oxidative Metabolism in C2C12 Myotubes. Cells 2022; 11:713. [PMID: 35203362 PMCID: PMC8869893 DOI: 10.3390/cells11040713] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 02/12/2022] [Accepted: 02/14/2022] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND Adiponectin (Adn), released by adipocytes and other cell types such as skeletal muscle, has insulin-sensitizing and anti-inflammatory properties. Sphingosine 1-phosphate (S1P) is reported to act as effector of diverse biological actions of Adn in different tissues. S1P is a bioactive sphingolipid synthesized by the phosphorylation of sphingosine catalyzed by sphingosine kinase (SK) 1 and 2. Consolidated findings support the key role of S1P in the biology of skeletal muscle. METHODS AND RESULTS Here we provide experimental evidence that S1P signalling is modulated by globular Adn treatment being able to increase the phosphorylation of SK1/2 as well as the mRNA expression levels of S1P4 in C2C12 myotubes. These findings were confirmed by LC-MS/MS that showed an increase of S1P levels after Adn treatment. Notably, the involvement of S1P axis in Adn action was highlighted since, when SK1 and 2 were inhibited by PF543 and ABC294640 inhibitors, respectively, not only the electrophysiological changes but also the increase of oxygen consumption and of aminoacid levels induced by the hormone, were significantly inhibited. CONCLUSION Altogether, these findings show that S1P biosynthesis is necessary for the electrophysiological properties and oxidative metabolism of Adn in skeletal muscle cells.
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Affiliation(s)
- Caterina Bernacchioni
- Department of Experimental and Clinical Biomedical Sciences “M. Serio”, University of Florence, 50134 Florence, Italy; (C.B.); (T.G.); (M.M.); (F.C.); (E.P.); (P.B.); (T.F.)
| | - Roberta Squecco
- Section of Physiological Sciences, Department of Experimental and Clinical Medicine, University of Florence, 50134 Florence, Italy; (R.S.); (R.G.); (E.I.)
| | - Tania Gamberi
- Department of Experimental and Clinical Biomedical Sciences “M. Serio”, University of Florence, 50134 Florence, Italy; (C.B.); (T.G.); (M.M.); (F.C.); (E.P.); (P.B.); (T.F.)
| | - Veronica Ghini
- Magnetic Resonance Center (CERM), University of Florence, 50019 Florence, Italy; (V.G.); (P.T.)
| | - Fabian Schumacher
- Institute of Pharmacy, Freie Universität Berlin, Königin-Luise-Str. 2+4, 14195 Berlin, Germany;
| | - Michele Mannelli
- Department of Experimental and Clinical Biomedical Sciences “M. Serio”, University of Florence, 50134 Florence, Italy; (C.B.); (T.G.); (M.M.); (F.C.); (E.P.); (P.B.); (T.F.)
| | - Rachele Garella
- Section of Physiological Sciences, Department of Experimental and Clinical Medicine, University of Florence, 50134 Florence, Italy; (R.S.); (R.G.); (E.I.)
| | - Eglantina Idrizaj
- Section of Physiological Sciences, Department of Experimental and Clinical Medicine, University of Florence, 50134 Florence, Italy; (R.S.); (R.G.); (E.I.)
| | - Francesca Cencetti
- Department of Experimental and Clinical Biomedical Sciences “M. Serio”, University of Florence, 50134 Florence, Italy; (C.B.); (T.G.); (M.M.); (F.C.); (E.P.); (P.B.); (T.F.)
| | - Elisa Puliti
- Department of Experimental and Clinical Biomedical Sciences “M. Serio”, University of Florence, 50134 Florence, Italy; (C.B.); (T.G.); (M.M.); (F.C.); (E.P.); (P.B.); (T.F.)
| | - Paola Bruni
- Department of Experimental and Clinical Biomedical Sciences “M. Serio”, University of Florence, 50134 Florence, Italy; (C.B.); (T.G.); (M.M.); (F.C.); (E.P.); (P.B.); (T.F.)
| | - Paola Turano
- Magnetic Resonance Center (CERM), University of Florence, 50019 Florence, Italy; (V.G.); (P.T.)
| | - Tania Fiaschi
- Department of Experimental and Clinical Biomedical Sciences “M. Serio”, University of Florence, 50134 Florence, Italy; (C.B.); (T.G.); (M.M.); (F.C.); (E.P.); (P.B.); (T.F.)
| | - Chiara Donati
- Department of Experimental and Clinical Biomedical Sciences “M. Serio”, University of Florence, 50134 Florence, Italy; (C.B.); (T.G.); (M.M.); (F.C.); (E.P.); (P.B.); (T.F.)
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Pásek M, Šimurda J, Bébarová M, Christé G. Divergent estimates of the ratio between Na+-Ca2+ current densities in t-tubular and surface membranes of rat ventricular cardiomyocytes. J Cell Sci 2021; 134:jcs258228. [PMID: 34313306 DOI: 10.1242/jcs.258228] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 05/24/2021] [Indexed: 11/20/2022] Open
Abstract
The ratio between Na+-Ca2+ exchange current densities in t-tubular and surface membranes of rat ventricular cardiomyocytes (JNaCa-ratio) estimated from electrophysiological data published to date yields strikingly different values between 1.7 and nearly 40. Possible reasons for such divergence were analysed by Monte Carlo simulations assuming both normal and log-normal distribution of the measured data. The confidence intervals CI95 of the mean JNaCa-ratios computed from the reported data showed an overlap of values between 1 and 3, and between 0.3 and 4.3 in the case of normal and log-normal distribution, respectively. Further analyses revealed that the published high values likely result from a large scatter of data due to transmural differences in JNaCa, dispersion of cell membrane capacitances and variability in incomplete detubulation. Taking into account the asymmetric distribution of the measured data, the reduction of mean current densities after detubulation and the substantially smaller CI95 of lower values of the mean JNaCa-ratio, the values between 1.6 and 3.2 may be considered as the most accurate estimates. This implies that 40 to 60% of Na+-Ca2+ exchanger is located at the t-tubular membrane of adult rat ventricular cardiomyocytes.
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Affiliation(s)
- Michal Pásek
- Institute of Thermomechanics, Czech Academy of Science, Dolejškova 5, 182 00, Prague, Czech Republic
- Department of Physiology, Faculty of Medicine, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
| | - Jiří Šimurda
- Department of Physiology, Faculty of Medicine, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
| | - Markéta Bébarová
- Department of Physiology, Faculty of Medicine, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
| | - Georges Christé
- Laboratoire de Neurocardiologie, EA4612, Université Lyon 1, Lyon F-69003, France
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Toward more accurate data in cardiac cellular electrophysiology. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2020; 157:1-2. [DOI: 10.1016/j.pbiomolbio.2020.06.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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