S-Equol Enantioselectively Activates cAMP-Protein Kinase A Signaling and Reduces Alloxan-Induced Cell Death in INS-1 Pancreatic β-Cells
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- HORIUCHI Hiroko
- Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Osaka Prefecture University
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- HARADA Naoki
- Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Osaka Prefecture University
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- ADACHI Tetsuya
- Laboratory of Food and Health Sciences, Minatogawa College
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- NAKANO Yoshihisa
- Osaka Women’s Junior College
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- INUI Hiroshi
- Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Osaka Prefecture University
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- YAMAJI Ryoichi
- Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Osaka Prefecture University
書誌事項
- タイトル別名
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- <i>S</i>-Equol Enantioselectively Activates cAMP-Protein Kinase A Signaling and Reduces Alloxan-Induced Cell Death in INS-1 Pancreatic β-Cells
- S-Equol Enantioselectively Activates cAMP-Protein Kinase A Signaling and Reduces Alloxan-Induced Cell Death in INS-1 Pancreatic ^|^beta;-Cells
この論文をさがす
抄録
S-Equol is enantioselectively produced from the isoflavone daidzein by gut microflora and is absorbed by the body. An increase of pancreatic β-cell death is directly associated with defects in insulin secretion and an increased risk of type 2 diabetes mellitus. In the present study, we demonstrate that only the S-enantiomer has suppressive effects against alloxan-induced oxidative stress in INS-1 pancreatic β-cells. S-Equol reduced alloxan-induced cell death in a dose-dependent manner, whereas R-equol had no effects. In contrast, no significant differences were observed between the enantiomers in estrogenic activity. The cytoprotective effects of S-equol were stronger than those of its precursor daidzein and were blocked by the protein synthesis inhibitor cycloheximide. The cytoprotection was diminished when cells were incubated with a protein kinase A (PKA) inhibitor (H89), but not an estrogen receptor inhibitor. S-Equol increased intracellular cAMP levels in an enantioselective manner. S-Equol, but not R-equol, induced phosphorylation of cAMP-response element-binding protein at Ser 133, and induced cAMP-response element-mediated transcription, both of which were diminished in the presence of H89. Taken together, these results show that S-equol enantioselectively increases the survival of INS-1 cells presumably through activating PKA signaling. Thus, S-equol might have applications as an anti-type 2 diabetic agent.
収録刊行物
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- Journal of Nutritional Science and Vitaminology
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Journal of Nutritional Science and Vitaminology 60 (4), 291-296, 2014
一般財団法人 学会誌刊行センター
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詳細情報 詳細情報について
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- CRID
- 1390282681301192320
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- NII論文ID
- 130004695722
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- NII書誌ID
- AA00703822
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- COI
- 1:CAS:528:DC%2BC2cXhsFaksr7J
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- ISSN
- 18817742
- 03014800
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- NDL書誌ID
- 025737224
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- PubMed
- 25297619
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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
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- 抄録ライセンスフラグ
- 使用不可