Silent information regulator 1 protects the liver against ischemia-reperfusion injury: implications in steatotic liver ischemic preconditioning.
Ischemia-reperfusion (IR) injury is an important problem in liver surgery especially when steatosis is present. Ischemic preconditioning (PC) is the only surgical strategy that has been applied in patients with steatotic livers undergoing warm ischemia. Silent information regulator 1 (SIRT1) is a histone deacetylase that regulates various cellular processes. This study evaluates the SIRT1 implication in PC in fatty livers. Homozygous (Ob) Zucker rats were subjected to IR and IR + PC. An additional group treated with sirtinol or EX527 (SIRT1 inhibitors) before PC was also realized. Liver injury and oxidative stress were evaluated. SIRT1 protein levels and activity, as well as other parameters involved in PC protective mechanisms (adenosine monophosphate protein kinase, eNOS, HSP70, MAP kinases, apoptosis), were also measured. We demonstrated that the protective effect of PC was due in part to SIRT1 induction, as SIRT1 inhibition resulted in increased liver injury and abolished the beneficial mechanisms of PC. In this study, we report for the first time that SIRT1 is involved in the protective mechanisms induced by hepatic PC in steatotic livers.
Experimental Hepatic Ischemia-Reperfusion Unit, Institute of Biomedical Research of Barcelona, IIBB-CSIC, Barcelona, Catalonia, Spain; Networked Biomedical Research Center of Hepatic and Digestive Diseases (CiberEHD), Barcelona, Catalonia, Spain.
Eirini
E
Pantazi
Mohamed Amine
MA
Zaouali
Mohamed
M
Bejaoui
Anna
A
Serafin
Emma
E
Folch-Puy
Valerie
V
Petegnief
Nuria
N
De Vera
Hassen
H
Ben Abdennebi
Antoni
A
Rimola
Joan
J
Roselló-Catafau
D000818:Animals; D017209:Apoptosis; D005234:Fatty Liver / Q000150:complications*; D018840:HSP70 Heat-Shock Proteins / Q000502:physiology; D019194:Ischemic Preconditioning; D008099:Liver / Q000098:blood supply* / Q000473:pathology; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D052250:Nitric Oxide Synthase Type III / Q000502:physiology; D018384:Oxidative Stress; D051381:Rats; D011924:Rats, Zucker; D015427:Reperfusion Injury / Q000517:prevention & control*; D056564:Sirtuin 1 / Q000032:analysis / Q000502:physiology*
D018840:HSP70 Heat-Shock Proteins; D052250:Nitric Oxide Synthase Type III; C496316:Nos3 protein, rat; D020928:Mitogen-Activated Protein Kinases; C488368:Sirt1 protein, rat; D056564:Sirtuin 1
Sirtuin 1; ischemic preconditioning; liver ischemia-reperfusion injury; nitric oxide; oxidative stress