التفاصيل البيبلوغرافية
| العنوان: |
Abnormal Mitochondrial cAMP/PKA Signaling Is Involved in Sepsis-Induced Mitochondrial and Myocardial Dysfunction. |
| المؤلفون: |
Neviere, Remi1,2 rneviere@univ-lille2.fr, Delguste, Florian2 florian.delguste@univ-lille2.fr, Durand, Arthur2,3 durand.arthur@gmail.com, Inamo, Jocelyn4 Jocelyn.Inamo@chu-fortdefrance.fr, Boulanger, Eric2 eric.boulanger@univ-lille2.fr, Preau, Sebastien2,3 seb.preau@gmail.com |
| المصدر: |
International Journal of Molecular Sciences. Dec2016, Vol. 17 Issue 12, p2075. 18p. 2 Diagrams, 2 Charts, 6 Graphs. |
| مصطلحات موضوعية: |
*ADRENERGIC receptors, *MEMBRANE proteins, *ADENYLATE cyclase, *CYCLIC adenylic acid, *CARDIAC contraction |
| مستخلص: |
Adrenergic receptors couple to Gs-proteins leading to transmembrane adenylyl cyclase activation and cytosolic cyclic adenosine monophosphate (cAMP) production. Cyclic AMP is also produced in the mitochondrial matrix, where it regulates respiration through protein kinase A (PKA)-dependent phosphorylation of respiratory chain complexes. We hypothesized that a blunted mitochondrial cAMP-PKA pathway would participate in sepsis-induced heart dysfunction. Adult male mice were subjected to intra-abdominal sepsis. Mitochondrial respiration of cardiac fibers and myocardial contractile performance were evaluated in response to 8Br-cAMP, PKA inhibition (H89), soluble adenylyl cyclase inhibition (KH7), and phosphodiesterase inhibition (IBMX; BAY60-7550). Adenosine diphosphate (ADP)-stimulated respiratory rates of cardiac fibers were reduced in septic mice. Compared with controls, stimulatory effects of 8Br-cAMP on respiration rates were enhanced in septic fibers, whereas inhibitory effects of H89 were reduced. Ser-58 phosphorylation of cytochrome c oxidase subunit IV-1 was reduced in septic hearts. In vitro, incubation of septic cardiac fibers with BAY60-7550 increased respiratory control ratio and improved cardiac MVO2 efficiency in isolated septic heart. In vivo, BAY60-7550 pre-treatment of septic mice have limited impact on myocardial function. Mitochondrial cAMP-PKA signaling is impaired in the septic myocardium. PDE2 phosphodiesterase inhibition by BAY60-7550 improves mitochondrial respiration and cardiac MVO2 efficiency in septic mice. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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