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Apart from the cardiac channel blockade, the membrane interaction has been referred to as another mode of their cardiotoxic action. By using biomimetic membranes, we verified the hypothesis that bupivacaine and lidocaine may increasingly interact with cardiac mitochondrial membranes under ischemia-like acidic conditions. Biomimetic membranes were prepared with different phospholipids and cholesterol to be unilamellar vesicles suspended in buffers of pH 7.4, 6.9, 6.4 or 5.9. Bupivacaine and lidocaine were reacted with the membrane preparations at cardiotoxically relevant concentrations and their membrane interactivities were determined by measuring fluorescence polarization. Both drugs interacted with 100 mol% 1,2-dipalmitoylphosphatidylcholine, peripheral nerve cell-mimetic and cardiomyocyte-mimetic membranes to increase membrane fluidity, although lowering the reaction pH from 7.4 to 5.9 decreased their membrane-fluidizing effects. In cardiomyocyte mitochondria-mimetic membranes containing 20 mol% cardiolipin, however, bupivacaine and lidocaine reversely increased their membrane interactivities at pH 5.9-6.4 compared with pH 7.4. Such increases were greater in anionic phospholipid membranes which consisted of substantial amounts of cardiolipin and phosphatidylserine. Positively charged bupivacaine and lidocaine would form ion-pairs with the negatively charged head-groups of anionic phospholipids under acidic conditions, thereby increasing the induced membrane fluidization. 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Cardiotoxic local anesthetics increasingly interact with biomimetic membranes under ischemia-like acidic conditions.
https://asahi-u.repo.nii.ac.jp/records/1258
https://asahi-u.repo.nii.ac.jp/records/125858870bb1-32d6-4376-9c57-eb0fe91530a2
名前 / ファイル | ライセンス | アクション |
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09186158_35_988992_2012 (510.6 kB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2014-12-26 | |||||
タイトル | ||||||
タイトル | Cardiotoxic local anesthetics increasingly interact with biomimetic membranes under ischemia-like acidic conditions. | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Cardiotoxic local anesthetics increasingly interact with biomimetic membranes under ischemia-like acidic conditions. | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Anesthetics, Local | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Bupivacaine | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Cardiolipins | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Cardiotoxins | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Cell Membrane | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Glycerophospholipids | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Hydrogen-Ion Concentration | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Ischemia | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Lidocaine | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Membrane Fluidity | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Membranes, Artificial | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Mitochondria | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Phosphatidylinositols | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Sphingomyelins | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Tsuchiya, Hironori
× Tsuchiya, Hironori× Mizogami, Maki× Ueno, Takahiro× Shigemi, Kenji |
|||||
所属 | ||||||
朝日大学 | ||||||
所属 | ||||||
福井大学 | ||||||
所属 | ||||||
朝日大学 | ||||||
所属 | ||||||
福井大学 | ||||||
書誌情報 |
en : Biological & pharmaceutical bulletin 巻 35, 号 6, p. 988-992, 発行日 2012-01-01 |
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出版者 | ||||||
日本薬学会 | ||||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | The cardiotoxic effects of local anesthetics increase in cardiac ischemia which is characterized by the tissue pH lowering to 6.5 or less. Apart from the cardiac channel blockade, the membrane interaction has been referred to as another mode of their cardiotoxic action. By using biomimetic membranes, we verified the hypothesis that bupivacaine and lidocaine may increasingly interact with cardiac mitochondrial membranes under ischemia-like acidic conditions. Biomimetic membranes were prepared with different phospholipids and cholesterol to be unilamellar vesicles suspended in buffers of pH 7.4, 6.9, 6.4 or 5.9. Bupivacaine and lidocaine were reacted with the membrane preparations at cardiotoxically relevant concentrations and their membrane interactivities were determined by measuring fluorescence polarization. Both drugs interacted with 100 mol% 1,2-dipalmitoylphosphatidylcholine, peripheral nerve cell-mimetic and cardiomyocyte-mimetic membranes to increase membrane fluidity, although lowering the reaction pH from 7.4 to 5.9 decreased their membrane-fluidizing effects. In cardiomyocyte mitochondria-mimetic membranes containing 20 mol% cardiolipin, however, bupivacaine and lidocaine reversely increased their membrane interactivities at pH 5.9-6.4 compared with pH 7.4. Such increases were greater in anionic phospholipid membranes which consisted of substantial amounts of cardiolipin and phosphatidylserine. Positively charged bupivacaine and lidocaine would form ion-pairs with the negatively charged head-groups of anionic phospholipids under acidic conditions, thereby increasing the induced membrane fluidization. The mitochondrial membrane interactions depending on pH lowering may be, at least in part, responsible for local anesthetic cardiotoxicity enhanced in acidosis associated with cardiac ischemia. | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | The cardiotoxic effects of local anesthetics increase in cardiac ischemia which is characterized by the tissue pH lowering to 6.5 or less. Apart from the cardiac channel blockade, the membrane interaction has been referred to as another mode of their cardiotoxic action. By using biomimetic membranes, we verified the hypothesis that bupivacaine and lidocaine may increasingly interact with cardiac mitochondrial membranes under ischemia-like acidic conditions. Biomimetic membranes were prepared with different phospholipids and cholesterol to be unilamellar vesicles suspended in buffers of pH 7.4, 6.9, 6.4 or 5.9. Bupivacaine and lidocaine were reacted with the membrane preparations at cardiotoxically relevant concentrations and their membrane interactivities were determined by measuring fluorescence polarization. Both drugs interacted with 100 mol% 1,2-dipalmitoylphosphatidylcholine, peripheral nerve cell-mimetic and cardiomyocyte-mimetic membranes to increase membrane fluidity, although lowering the reaction pH from 7.4 to 5.9 decreased their membrane-fluidizing effects. In cardiomyocyte mitochondria-mimetic membranes containing 20 mol% cardiolipin, however, bupivacaine and lidocaine reversely increased their membrane interactivities at pH 5.9-6.4 compared with pH 7.4. Such increases were greater in anionic phospholipid membranes which consisted of substantial amounts of cardiolipin and phosphatidylserine. Positively charged bupivacaine and lidocaine would form ion-pairs with the negatively charged head-groups of anionic phospholipids under acidic conditions, thereby increasing the induced membrane fluidization. The mitochondrial membrane interactions depending on pH lowering may be, at least in part, responsible for local anesthetic cardiotoxicity enhanced in acidosis associated with cardiac ischemia. | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 1347-5215 | |||||
PubMed番号 | ||||||
関連タイプ | isIdenticalTo | |||||
識別子タイプ | PMID | |||||
関連識別子 | info:pmid/22687545 | |||||
DOI | ||||||
関連タイプ | isIdenticalTo | |||||
識別子タイプ | DOI | |||||
関連識別子 | info:doi/http://dx.doi.org/10.1248/bpb.35.988 | |||||
フォーマット | ||||||
内容記述タイプ | Other | |||||
内容記述 | application/pdf | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 |