Abstract
Although mitochondria are key determinants of myocardial injury during ischemia–reperfusion (I/R), their interaction with critical cytoprotective signaling systems is not fully understood. Sphingosine-1-phosphate (S1P) produced by sphingosine kinase-1 protects the heart from I/R damage. Recently a new role for mitochondrial S1P produced by a second isoform of sphingosine kinase, SphK2, was described to regulate complex IV assembly and respiration via interaction with mitochondrial prohibitin-2. Here we investigated the role of SphK2 in cardioprotection by preconditioning. Littermate (WT) and sphk2 −/− mice underwent 45 min of in vivo ischemia and 24 h reperfusion. Mice received no intervention (I/R) or preconditioning (PC) via 5 min I/R before the index ischemia. Despite the activation of PC-cytoprotective signaling pathways in both groups, infarct size in sphk2 −/− mice was not reduced by PC (42 ± 3% PC vs. 43 ± 4% I/R, p = ns) versus WT (24 ± 3% PC vs. 43 ± 3% I/R, p < 0.05). sphk2 −/− mitochondria exhibited decreased oxidative phosphorylation and increased susceptibility to permeability transition (PTP). Unlike WT, PC did not prevent ischemic damage to electron transport or the increased susceptibility to PTP. To evaluate the direct contribution to the resistance of mitochondria to cytoprotection, SphK2, PHB2 or cytochrome oxidase subunit IV was depleted in cardiomyoblasts. PC protection was abolished by each knockdown concomitant with decreased PTP resistance. These results point to a new action of S1P in cardioprotection and suggest that the mitochondrial S1P produced by SphK2 is required for the downstream protective modulation of PTP as an effector of preconditioning protection.
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Acknowledgments
The authors thank Drs. Anindita Das and Robert Paillard for their advice and technical help. We thank Dr. Fadi N. Salloum from the Division of Cardiology, Department of Internal Medicine, Virginia Commonwealth University for echocardiographic measurements. And we thank Dr. Claudine Kieda from the Centre Biophysique Moléculaire (CNRS, France) for the gift of H9c2 cells. This work was supported by U.S. National Institutes of Health (NIH) grants 2PO1AG15885 (E.J.L.) and R37GM043880 (S.S), Medical Research Service, Department of Veterans Affairs Merit Review Award to E.J.L. and the Pauley Heart Center, Virginia Commonwealth University (E.J.L., Q.C., L.G., M.P.). L.G was supported by SERVIER grant “jeune chercheur” (France) and M.P. was supported by French grant EXPLORA’DOC 2009 (Rhône-Alpes, France).
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395_2011_223_MOESM1_ESM.ppt
Supplemental Figure : Histological assessment of fibrosis in WT and sphk2 −/− mice. Histopathology of heart sections stained with Masson’s trichrome showing no significant myofiber disarray and the absence of interstitial fibrosis (stained blue) in WT and sphk2 −/− mice at 10 weeks of age. Transgenic mice do not demonstrate increased fibrosis compared to WT at 10 months of age (n = 2/group) (PPT 266 kb)
395_2011_223_MOESM2_ESM.ppt
Supplemental Table 1: Cardiac phenotype of sphk2 −/− mice. Echocardiography was performed with light anesthesia (pentobarbital 60 mg/kg IP). Images were acquired with a 13-MHz linear-array transducer with a digital ultrasound system (Vivid 7, GE Medical Systems, Waukesha, Wis). Conventional measurements were performed in WT vs sphk2 −/− mice at 15 weeks old: LV weight, heart rate, LV anterior (Aw) and posterior wall (Pw) thickness, LV dimensions (end-diastolic LVEDD and end-systolic LVESD diameters and interventricular septal diameter), and LV shortening fraction. Data are expressed as the mean ± SEM. Numerical data were compared using Student’s t test. Statistical significance was defined as a value of p<0.05. At baseline, WT and sphk2 −/− mice had comparable heart rates. LV end-systolic, LV end-diastolic diameters, wall thickness and shortening fractions were similar in two groups (p = ns, n = 4/groups) (PPT 120 kb)
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Gomez, L., Paillard, M., Price, M. et al. A novel role for mitochondrial sphingosine-1-phosphate produced by sphingosine kinase-2 in PTP-mediated cell survival during cardioprotection. Basic Res Cardiol 106, 1341–1353 (2011). https://doi.org/10.1007/s00395-011-0223-7
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DOI: https://doi.org/10.1007/s00395-011-0223-7