SIRT1 modulates MAPK pathways in ischemic-reperfused cardiomyocytes.
SIRT1, an ubiquitous NAD(+)-dependent deacetylase that plays a role in biological processes such as longevity and stress response, is significantly activated in response to reactive oxygen species (ROS) production. Resveratrol (Resv), an important activator of SIRT1, has been shown to exert major health benefits in diseases associated with oxidative stress. In ischemia-reperfusion (IR) injury, a major role has been attributed to the mitogen-activated protein kinase (MAPK) pathway, which is upregulated in response to a variety of stress stimuli, including oxidative stress. In neonatal rat ventricular cardiomyocytes subjected to simulated IR, the effect of Resv-induced SIRT1 activation and the relationships with the MAPK pathway were investigated. Resv-induced SIRT1 overexpression protected cardiomyocytes from oxidative injury, mitochondrial dysfunction, and cell death induced by IR. For the first time, we demonstrate that SIRT1 overexpression positively affects the MAPK pathway-via Akt/ASK1 signaling-by reducing p38 and JNK phosphorylation and increasing ERK phosphorylation. These results reveal a new protective mechanism elicited by Resv-induced SIRT1 activation in IR tissues and suggest novel potential therapeutic targets to manage IR-induced cardiac dysfunction.
Department of Biochemical Sciences, University of Florence, Florence, Italy.
Matteo
M
Becatti
Niccolò
N
Taddei
Cristina
C
Cecchi
Niccolò
N
Nassi
Paolo Antonio
PA
Nassi
Claudia
C
Fiorillo
D000704:Analysis of Variance; D000818:Animals; D015153:Blotting, Western; D020169:Caspases / Q000378:metabolism; D005434:Flow Cytometry; D015151:Immunoblotting; D047468:Immunoprecipitation; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D015227:Lipid Peroxidation / Q000502:physiology; D053078:Membrane Potential, Mitochondrial; D033681:Mitochondrial Membrane Transport Proteins / Q000378:metabolism; D000083162:Mitochondrial Permeability Transition Pore; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism*; D032383:Myocytes, Cardiac / Q000378:metabolism* / Q000502:physiology; D051381:Rats; D017382:Reactive Oxygen Species / Q000378:metabolism; D015427:Reperfusion Injury / Q000201:enzymology*; D015398:Signal Transduction / Q000502:physiology*; D056564:Sirtuin 1 / Q000378:metabolism*
D033681:Mitochondrial Membrane Transport Proteins; D000083162:Mitochondrial Permeability Transition Pore; D017382:Reactive Oxygen Species; D007770:L-Lactate Dehydrogenase; D020928:Mitogen-Activated Protein Kinases; D020169:Caspases; C488368:Sirt1 protein, rat; D056564:Sirtuin 1