Roles of Na⁺/H⁺ Exchanger Type 1 and Intracellular pH in Angiotensin Ⅱ-Induced Reactive Oxygen Species Generation and Podocyte Apoptosis
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- Liu Ya
- Department of Pharmacology, Faculty of Medicine, Kagawa University, Japan
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- Hitomi Hirofumi
- Department of Pharmacology, Faculty of Medicine, Kagawa University, Japan
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- Diah Suwarni
- Department of Pharmacology, Faculty of Medicine, Kagawa University, Japan
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- Deguchi Kazushi
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Japan
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- Mori Hirohito
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Japan
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- Masaki Tsutomu
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Japan
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- Nakano Daisuke
- Department of Pharmacology, Faculty of Medicine, Kagawa University, Japan
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- Kobori Hiroyuki
- Department of Pharmacology, Faculty of Medicine, Kagawa University, Japan
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- Nishiyama Akira
- Department of Pharmacology, Faculty of Medicine, Kagawa University, Japan
書誌事項
- タイトル別名
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- Roles of Na<sup>+</sup>/H<sup>+</sup> Exchanger Type 1 and Intracellular pH in Angiotensin II-Induced Reactive Oxygen Species Generation and Podocyte Apoptosis
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A growing body of evidence suggests that podocyte apoptosis is a major cause of decreased podocyte number, which leads to albuminuria and glomerular injury. The aim of this study was to clarify the molecular mechanisms of angiotensin II (Ang II)-induced apoptosis in cultured mouse podocytes. We examined the effects of Ang II (100 nmol/L) on apoptosis, superoxide anions, and cytosol pH in podocytes. For intracellular pH measurements, image analysis was conducted using confocal laser microscopy after incubation with carboxy-seminaphthorhodafluor-1. Superoxide anions and intracellular pH were elevated with Ang II treatment. Apoptotic cell numbers, as measured by TUNEL staining and caspase 3 activity, were also augmented in the Ang II–treated group. Pre-treatment with olmesartan (100 nmol/L, an Ang II type 1–receptor blocker), apocynin (50 μmol/L, NADPH oxidase inhibitor), or 5-N,N hexamethylene amiloride [30 μmol/L, Na+/H+ exchanger type 1 (NHE-1) inhibitor] abolished Ang II–induced podocyte apoptosis, whereas NHE-1 mRNA and protein expression was not affected by Ang II treatment. Moreover, Ang II increased NHE-1 phosphorylation. These results suggest that superoxide production, NHE-1 activation, and intracellular alkalization were early features prior to apoptosis in Ang II–treated mouse podocytes, and may offer new insights into the mechanisms responsible for Ang II–induced podocyte injury.
収録刊行物
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- Journal of Pharmacological Sciences
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Journal of Pharmacological Sciences 122 (3), 176-183, 2013
公益社団法人 日本薬理学会
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詳細情報 詳細情報について
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- CRID
- 1390001205180386816
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- NII論文ID
- 10031185411
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- NII書誌ID
- AA11806667
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- COI
- 1:CAS:528:DC%2BC3sXht12hu7%2FL
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- ISSN
- 13478648
- 13478613
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- NDL書誌ID
- 024705997
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- PubMed
- 23800993
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
- KAKEN
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- 使用不可