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タイトル別表記
アミノ酸飢餓下の腎臓上皮細胞におけるD-アミノ酸酸化酵素の動態
Dynamics of DAO protein in kidney cells under AA starvation
著者
曽我部, 浩史 徳島大学大学院医科学教育部(医学専攻)
Miyazaki, Hayato Tokushima University
Kim, Soo Hyeon Tokushima University
Rachadech, Wanitcha Tokushima University|Udon Thani Rajabhat University
キーワード
D-amino acid oxidase
Kidney epithelial cell
Amino acid starvation
Peroxisome
Autophagy
資料タイプ
学位論文
抄録
D-amino acid oxidase (DAO) is a flavoenzyme catalyzing the oxidation of D-amino acid (AA)s.In the kidney, its expression is detected in proximal tubules, and DAO is considered to play a role in the conversion of D-form AAs to α-keto acids. LLC-PK1 cells, a pig renal proximal tubule cell line, were used to elucidate the regulation of DAO protein synthesis and degradation. In this study, we showed that trypsinization of LLC-PK1 cells in culture system rapidly reduced the intracellular DAO protein level to approximately 33.9% of that before treatment, even within 30 min. Furthermore, we observed that the DAO protein level was decreased when LLC-PK1 cells were subjected to AA starvation. To determine the degradation pathway, we treated the cells with chloroquine and MG132. DAO degradation was found to be inhibited by chloroquine, but not by MG132 treatment. We next examined whether or not DAO was degraded by autophagy. We found that AA starvation led to an increased accumulation of LC3-II, suggesting that DAO protein is degraded by autophagy due to AA starvation conditions. Furthermore, treatment with cycloheximide inhibited DAO protein degradation. Taken together, DAO protein is degraded by autophagy under starvation. The present study revealed the potential dynamics of DAO correlated with renal pathophysiology.
掲載誌名
The Journal of Biochemistry
ISSN
17562651
0021924X
cat書誌ID
AA12096002
AA00694073
出版者
Oxford University Press
170
1
開始ページ
119
終了ページ
129
発行日
2021-03-16
備考
内容要旨・審査要旨・論文本文の公開
本論文は,著者Hirofumi Sogabeの学位論文として提出され,学位審査・授与の対象となっている。
This is a pre-copyedited, author-produced version of an article accepted for publication in The Journal of Biochemistry following peer review. The version of record Hirofumi Sogabe, Yuji Shishido, Hayato Miyazaki, Soo Hyeon Kim, Wanitcha Rachadech, Kiyoshi Fukui, Dynamics of D-amino acid oxidase ain kidney epithelial cells under amino acid starvation, The Journal of Biochemistry, Volume 170, Issue 1, July 2021, Pages 119–129, is available online at: https://doi.org/10.1093/jb/mvab029
EDB ID
出版社版DOI
出版社版URL
フルテキストファイル
言語
eng
著者版フラグ
博士論文全文を含む
文科省報告番号
甲第3528号
学位記番号
甲医第1498号
学位授与年月日
2021-04-22
学位名
博士(医学)
学位授与機関
徳島大学
部局
先端酵素学研究所