Abstract:
PURPOSE:The melatonin receptor (MT) agonist ramelteon has a higher affinity to MT1 than for MT2 receptors and induces cardioprotection by involvement of mitochondrial potassium channels. Activation of mitochondrial potassium channels leads to release of free radicals. We investigated whether (1) ramelteon-induced cardioprotection is MT2 receptor specific and (2) if free radicals are involved in ramelteon-induced cardioprotection. METHODS:Hearts of male Wistar rats were randomized, placed on a Langendorff system, and perfused with Krebs-Henseleit buffer at a constant pressure of 80 mmHg. All hearts were subjected to 33 min of global ischemia and 60 min of reperfusion. Before ischemia hearts were perfused with ramelteon (Ram) with or without the MT2 receptor inhibitor 4-phenyl-2-propionamidotetralin (4P-PDOT+Ram, 4P-PDOT). In subsequent experiments, ramelteon was administered together with the radical oxygen species (ROS) scavenger N-2-mercaptopropionylglycine (MPG+Ram). To determine whether the blockade of ramelteon-induced cardioprotection can be restored, we combined ramelteon and MPG with mitochondrial permeability transition pore (mPTP) inhibitor cyclosporine A (CsA) at different time points. Infarct size was determined by triphenyltetrazolium chloride (TTC) staining. RESULTS:Ramelteon-induced infarct size reduction was completely blocked by 4P-PDOT and MPG. Ramelteon and MPG combined with CsA before ischemia were not cardioprotective but CsA at the onset of reperfusion could restore infarct size reduction. CONCLUSIONS:This study shows for the first time that despite the higher affinity to MT1 receptors, (1) ramelteon-induced cardioprotection involves MT2 receptors, (2) cardioprotection requires ROS release, and (3) inhibition of the mPTP can restore infarct size reduction.
journal_name
Cardiovasc Drugs Therjournal_title
Cardiovascular drugs and therapyauthors
Stroethoff M,Goetze L,Torregroza C,Bunte S,Raupach A,Heinen A,Mathes A,Hollmann MW,Huhn Rdoi
10.1007/s10557-020-06972-4subject
Has Abstractpub_date
2020-06-01 00:00:00pages
303-310issue
3eissn
0920-3206issn
1573-7241pii
10.1007/s10557-020-06972-4journal_volume
34pub_type
杂志文章abstract:INTRODUCTION:Several beta blocking drugs (BB) reduce mortality in systolic heart failure (LVSD). We have compared the initial response to introduction of carvedilol and bisoprolol during the standard dose titration protocols for each drug. METHODS:Approximately 31 unselected patients with stable LVSD were randomised t...
journal_title:Cardiovascular drugs and therapy
pub_type: 杂志文章,随机对照试验
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journal_title:Cardiovascular drugs and therapy
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journal_title:Cardiovascular drugs and therapy
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journal_title:Cardiovascular drugs and therapy
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journal_title:Cardiovascular drugs and therapy
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journal_title:Cardiovascular drugs and therapy
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journal_title:Cardiovascular drugs and therapy
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pub_type: 杂志文章,已发布勘误
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更新日期:2018-12-01 00:00:00
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更新日期:2010-06-01 00:00:00
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doi:10.1007/s10557-020-07050-5
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journal_title:Cardiovascular drugs and therapy
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更新日期:2020-05-30 00:00:00
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journal_title:Cardiovascular drugs and therapy
pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
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更新日期:1992-10-01 00:00:00
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pub_type: 杂志文章,随机对照试验
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更新日期:2018-12-01 00:00:00
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journal_title:Cardiovascular drugs and therapy
pub_type: 杂志文章
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更新日期:2012-04-01 00:00:00
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journal_title:Cardiovascular drugs and therapy
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更新日期:2002-01-01 00:00:00
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journal_title:Cardiovascular drugs and therapy
pub_type: 杂志文章,meta分析
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更新日期:1997-07-01 00:00:00