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Tsuno S, Harada K, Horikoshi M, Mita M, Kitaguchi T, Hirai MY, Matsumoto M, Tsuboi T. Mitochondrial ATP concentration decreases immediately after glucose administration to glucose-deprived hepatocytes. FEBS Open Bio 2024; 14:79-95. [PMID: 38049196 PMCID: PMC10761928 DOI: 10.1002/2211-5463.13744] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 11/15/2023] [Accepted: 12/01/2023] [Indexed: 12/06/2023] Open
Abstract
Hepatocytes can switch their metabolic processes in response to nutrient availability. However, the dynamics of metabolites (such as lactate, pyruvate, and ATP) in hepatocytes during the metabolic switch remain unknown. In this study, we visualized metabolite dynamics in primary cultured hepatocytes during recovery from glucose-deprivation. We observed a decrease in the mitochondrial ATP concentration when glucose was administered to hepatocytes under glucose-deprivation conditions. In contrast, there was slight change in the cytoplasmic ATP concentration. A decrease in mitochondrial ATP concentration was associated with increased protein synthesis rather than glycogen synthesis, activation of urea cycle, and production of reactive oxygen species. These results suggest that mitochondrial ATP is important in switching metabolic processes in the hepatocytes.
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Affiliation(s)
- Saki Tsuno
- Department of Life Sciences, Graduate School of Arts and SciencesThe University of TokyoTokyoJapan
- Dairy Science and Technology InstituteKyodo Milk Industry Co., Ltd.TokyoJapan
| | - Kazuki Harada
- Department of Life Sciences, Graduate School of Arts and SciencesThe University of TokyoTokyoJapan
| | - Mina Horikoshi
- Department of Biological Sciences, Graduate School of ScienceThe University of TokyoTokyoJapan
| | - Marie Mita
- Department of Life Sciences, Graduate School of Arts and SciencesThe University of TokyoTokyoJapan
- Present address:
Biomedical Research InstituteNational Institute of Advanced Industrial Science and TechnologyOsakaJapan
| | - Tetsuya Kitaguchi
- Laboratory for Chemistry and Life Science, Institute of Innovative ResearchTokyo Institute of TechnologyYokohamaJapan
| | | | - Mitsuharu Matsumoto
- Dairy Science and Technology InstituteKyodo Milk Industry Co., Ltd.TokyoJapan
| | - Takashi Tsuboi
- Department of Life Sciences, Graduate School of Arts and SciencesThe University of TokyoTokyoJapan
- Department of Biological Sciences, Graduate School of ScienceThe University of TokyoTokyoJapan
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Miura R, Mimura I, Saigusa H, Yamazaki T, Tanemoto F, Kurata Y, Sato D, Tanaka T, Nangaku M. Chromatin remodeling factor, INO80, inhibits PMAIP1 in renal tubular cells via exchange of histone variant H2A.Z. for H2A. Sci Rep 2023; 13:13235. [PMID: 37580530 PMCID: PMC10425331 DOI: 10.1038/s41598-023-40540-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2023] [Accepted: 08/12/2023] [Indexed: 08/16/2023] Open
Abstract
Epigenetic modifications such as DNA methylation, histone modifications, and chromatin structures in the kidney contribute towards the progression of chronic kidney disease (CKD). In this study, the role of chromatin remodeling factor inositol requiring 80 (INO80) was investigated. Although INO80 regulates transcription by altering the chromatin structure at the nucleosome level, its role in the kidney remains unknown. We demonstrated that the expression of INO80 in impaired kidneys decreased in rats with unilateral urethral obstruction. We investigated INO80 expression in a proximal tubular cell line and observed that its expression decreased under hypoxic condition. Additionally, INO80 knockdown promoted apoptosis, suggesting that INO80 plays a role in inhibiting tubular cell apoptosis. We identified downstream target genes of INO80 via genome-wide analysis using RNA-sequences and found that the expression of apoptosis-related genes, such as TP53 and E2F1, and pro-apoptotic genes, such as PMAIP1, increased upon INO80 knockdown. ChIP-qPCR of the loci of PMAIP1 showed that the amount of H2A.Z. increased instead of decreasing the amount of H2A when INO80 was knocked down. These results indicated that INO80 plays a role in the exchange of H2A.Z. for H2A in the promoter region of PMAIP1 in tubular cells to inhibit apoptosis during CKD progression.
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Affiliation(s)
- Rika Miura
- Division of Nephrology and Endocrinology, The University of Tokyo School of Medicine, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Imari Mimura
- Division of Nephrology and Endocrinology, The University of Tokyo School of Medicine, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
| | - Hanako Saigusa
- Division of Nephrology and Endocrinology, The University of Tokyo School of Medicine, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Tomotaka Yamazaki
- Division of Nephrology and Endocrinology, The University of Tokyo School of Medicine, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Fumiaki Tanemoto
- Division of Nephrology and Endocrinology, The University of Tokyo School of Medicine, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Yu Kurata
- Division of Nephrology and Endocrinology, The University of Tokyo School of Medicine, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Dai Sato
- Division of Nephrology and Endocrinology, The University of Tokyo School of Medicine, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Tetsuhiro Tanaka
- Department of Nephrology, Rheumatology and Endocrinology, Tohoku University Graduate School of Medicine, Sendai, 980-8574, Japan
| | - Masaomi Nangaku
- Division of Nephrology and Endocrinology, The University of Tokyo School of Medicine, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
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