Cardioprotection of tilianin ameliorates myocardial ischemia-reperfusion injury: Role of the apoptotic signaling pathway

Our previous research demonstrated that tilianin protects the myocardium in a myocardial ischemia reperfusion injury (MIRI) rat model and has prominent pharmacological potential as a cardiovascular drug. Our study aimed to investigate the molecular signaling implicated in the improvement of myocardi...

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Veröffentlicht in:PloS one 2018-03, Vol.13 (3), p.e0193845-e0193845
Hauptverfasser: Zeng, Cheng, Jiang, Wen, Zheng, Ruifang, He, Chenghui, Li, Jianguang, Xing, Jianguo
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Jiang, Wen
Zheng, Ruifang
He, Chenghui
Li, Jianguang
Xing, Jianguo
description Our previous research demonstrated that tilianin protects the myocardium in a myocardial ischemia reperfusion injury (MIRI) rat model and has prominent pharmacological potential as a cardiovascular drug. Our study aimed to investigate the molecular signaling implicated in the improvement of myocardial survival induced by tilianin, a flavonoid antioxidant. Tilianin (2.5, 5, and 10 mg/kg/d) or saline was orally administered to rats for 14 days. On the 15th day, ischemia was induced by ligating the left anterior descending artery for 45 min, followed by 4 h of reperfusion. The levels of MIRI-induced serum myocardial enzymes and cardiomyocyte apoptosis as well as infarct size were examined to assess the cardioprotective effects. Cardiac tissues were collected for western blot analyses to determine the protein expression of anti-apoptotic signaling molecules. In MIRI-treated rats, our results revealed that pre-administration of high dose-tilianin the reduced release of LDH, MDA, and CK-MB and increased the plasma SOD level, and significantly attenuated the infarct size. Western blot analysis showed that a remarkable rise in expression of Bcl-2 and XIAP, and decline in expression of Bax, Smac/Diablo, HtrA2/Omi, cleaved caspase-3, caspase-7 and caspase-9 was observed in the myocardium. The apoptosis index of cardiomyocytes further supports the cardioprotective effect of tilianin. Additionally, compared with the MIRI model group, pretreatment with high dose-tilianin group upregulated phosphorylated Akt and PI3K. In contrast, using the PI3K inhibitor LY294002 to block Akt activation effectively inhibited the protective effects of tilianin against MIRI. Tilianin pretreatment was beneficial for activating the PI3K/Akt signaling pathway and inhibiting myocardial apoptosis.
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Our study aimed to investigate the molecular signaling implicated in the improvement of myocardial survival induced by tilianin, a flavonoid antioxidant. Tilianin (2.5, 5, and 10 mg/kg/d) or saline was orally administered to rats for 14 days. On the 15th day, ischemia was induced by ligating the left anterior descending artery for 45 min, followed by 4 h of reperfusion. The levels of MIRI-induced serum myocardial enzymes and cardiomyocyte apoptosis as well as infarct size were examined to assess the cardioprotective effects. Cardiac tissues were collected for western blot analyses to determine the protein expression of anti-apoptotic signaling molecules. In MIRI-treated rats, our results revealed that pre-administration of high dose-tilianin the reduced release of LDH, MDA, and CK-MB and increased the plasma SOD level, and significantly attenuated the infarct size. 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Our study aimed to investigate the molecular signaling implicated in the improvement of myocardial survival induced by tilianin, a flavonoid antioxidant. Tilianin (2.5, 5, and 10 mg/kg/d) or saline was orally administered to rats for 14 days. On the 15th day, ischemia was induced by ligating the left anterior descending artery for 45 min, followed by 4 h of reperfusion. The levels of MIRI-induced serum myocardial enzymes and cardiomyocyte apoptosis as well as infarct size were examined to assess the cardioprotective effects. Cardiac tissues were collected for western blot analyses to determine the protein expression of anti-apoptotic signaling molecules. In MIRI-treated rats, our results revealed that pre-administration of high dose-tilianin the reduced release of LDH, MDA, and CK-MB and increased the plasma SOD level, and significantly attenuated the infarct size. Western blot analysis showed that a remarkable rise in expression of Bcl-2 and XIAP, and decline in expression of Bax, Smac/Diablo, HtrA2/Omi, cleaved caspase-3, caspase-7 and caspase-9 was observed in the myocardium. The apoptosis index of cardiomyocytes further supports the cardioprotective effect of tilianin. Additionally, compared with the MIRI model group, pretreatment with high dose-tilianin group upregulated phosphorylated Akt and PI3K. In contrast, using the PI3K inhibitor LY294002 to block Akt activation effectively inhibited the protective effects of tilianin against MIRI. Tilianin pretreatment was beneficial for activating the PI3K/Akt signaling pathway and inhibiting myocardial apoptosis.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>29538428</pmid><doi>10.1371/journal.pone.0193845</doi><tpages>e0193845</tpages><orcidid>https://orcid.org/0000-0002-5711-5664</orcidid><oa>free_for_read</oa></addata></record>
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source Public Library of Science (PLoS) Journals Open Access; MEDLINE; DOAJ Directory of Open Access Journals; EZB-FREE-00999 freely available EZB journals; PubMed Central; Free Full-Text Journals in Chemistry
subjects 1-Phosphatidylinositol 3-kinase
Administration, Oral
AKT protein
Animal tissues
Animals
Antioxidants
Apoptosis
Apoptosis - physiology
Bax protein
Bcl-2 protein
Biology and Life Sciences
Cardiomyocytes
Cardiotonic Agents - chemistry
Cardiotonic Agents - pharmacology
Cardiovascular disease
Caspase
Caspase-3
Caspase-7
Caspase-9
Chromones - pharmacology
DIABLO protein
Disease Models, Animal
Dose-Response Relationship, Drug
Dracocephalum moldavica
Drugs, Chinese Herbal
Enzyme Inhibitors - pharmacology
Flavonoids - chemistry
Flavonoids - pharmacology
Glycosides - chemistry
Glycosides - pharmacology
Heart diseases
Ischemia
Kinases
Male
Medicine and Health Sciences
Molecular Structure
Morpholines - pharmacology
Myocardial ischemia
Myocardial Reperfusion Injury - diagnostic imaging
Myocardial Reperfusion Injury - drug therapy
Myocardial Reperfusion Injury - metabolism
Myocardial Reperfusion Injury - pathology
Myocardium
Myocytes, Cardiac - drug effects
Myocytes, Cardiac - metabolism
Myocytes, Cardiac - pathology
Oral administration
Pharmacology
Phosphatidylinositol 3-Kinases - metabolism
Proto-Oncogene Proteins c-akt - antagonists & inhibitors
Proto-Oncogene Proteins c-akt - metabolism
Random Allocation
Rats
Rats, Sprague-Dawley
Reperfusion
Reperfusion injury
Rodents
Signal Transduction
Signaling
XIAP protein
title Cardioprotection of tilianin ameliorates myocardial ischemia-reperfusion injury: Role of the apoptotic signaling pathway
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