Nobiletin ameliorates hepatic ischemia and reperfusion injury through the activation of SIRT-1/FOXO3a-mediated autophagy and mitochondrial biogenesis
Autor: | Hye Jung Kim, Theodomir Dusabimana, Hwajin Kim, So Ra Kim, Sang Won Park |
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Jazyk: | angličtina |
Rok vydání: | 2019 |
Předmět: |
0301 basic medicine
Male Programmed cell death Clinical Biochemistry Cellular homeostasis lcsh:Medicine Mitochondrion Pharmacology Biochemistry Nobiletin Article lcsh:Biochemistry 03 medical and health sciences chemistry.chemical_compound Mice 0302 clinical medicine Sirtuin 1 medicine Autophagy Animals lcsh:QD415-436 Acute inflammation Molecular Biology Organelle Biogenesis business.industry Liver Diseases Hepatotoxicity Forkhead Box Protein O3 lcsh:R medicine.disease Flavones Transplantation Mice Inbred C57BL 030104 developmental biology chemistry Mitochondrial biogenesis 030220 oncology & carcinogenesis Reperfusion Injury Molecular Medicine business Reperfusion injury Signal Transduction |
Zdroj: | Experimental and Molecular Medicine, Vol 51, Iss 4, Pp 1-16 (2019) Experimental & Molecular Medicine |
ISSN: | 2092-6413 1226-3613 |
Popis: | Hepatic ischemia and reperfusion injury are characterized by impaired autophagy, mitochondrial dysfunction, and subsequent compromise of cellular homeostasis following hepatic surgery or transplantation. Nobiletin, a natural flavonoid, is a beneficial antioxidant that possesses anti-inflammatory and anti-cancer activities. We investigated the effect of nobiletin on hepatic IR injury and described the underlying mechanisms. C57BL/6 mice were subjected to 60 min of partial hepatic ischemia, treated with nobiletin (5 mg/kg) or vehicle at the start of reperfusion, and killed at 5 h of reperfusion. Hepatic ischemia and reperfusion increased hepatocellular oxidative damage, inflammation, and cell death, but these changes were alleviated upon nobiletin treatment. Nobiletin increased the expression of proteins that control autophagy, mitochondrial dynamics, and biogenesis. Specifically, the SIRT-1/FOXO3a and PGC-1α pathways were activated by nobiletin. IR-induced AKT activation was associated with FOXO3a phosphorylation, which resulted in a significant reduction in the nuclear FOXO3a levels and potentially attenuated autophagy-regulatory gene expression. Nobiletin increased FOXO3a expression and its nuclear translocation via the inhibition of AKT. Specific inhibition of SIRT-1 abolished the protective effect of nobiletin, causing decreased FOXO3a expression, followed by autophagy induction and decreased PGC-1α expression and mitochondrial dynamics. Taken together, our data indicate that SIRT-1 directly mediates the protective effect of nobiletin against hepatic ischemia and reperfusion injury. The activation of autophagy and mitochondrial function through the SIRT-1/FOXO3a and PGC-1α pathways indicate that nobiletin could have therapeutic potential for treating hepatic ischemia and reperfusion injury. Liver injury: Citrus peel to the rescue Nobiletin, an antioxidant found in citrus peel, may protect the liver from reperfusion injury, damage following blood flow interruption. When blood flow is restricted and then restored, as in transplant, surgery, or shock, cells are injured, largely due to damage to the cellular powerhouses, the mitochondria. Nobiletin is known to have many benefits, including anti-cancer and anti-inflammatory activities, but its mechanism of action is not well understood. Sang Won Park and Hwajin Kim, at the Gyeongsang National University School of Medicine, in Jinju, South Korea, and co-workers, investigated how nobiletin might protect the liver against interruption of blood flow. They found that nobiletin triggered cells to dismantle damaged mitochondria and produce new, functioning mitochondria, greatly reducing liver damage. These results illuminate how nobiletin works and may lead to better treatments for liver reperfusion injury. |
Databáze: | OpenAIRE |
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