- Basic Research
- CycloZ Improves Hyperglycemia and Lipid Metabolism by Modulating Lysine Acetylation in KK-Ay Mice
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Jongsu Jeon, Dohyun Lee, Bobae Kim, Bo-Yoon Park, Chang Joo Oh, Min-Ji Kim, Jae-Han Jeon, In-Kyu Lee, Onyu Park, Seoyeong Baek, Chae Won Lim, Dongryeol Ryu, Sungsoon Fang, Johan Auwerx, Kyong-Tai Kim, Hoe-Yune Jung
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Diabetes Metab J. 2023;47(5):653-667. Published online April 26, 2023
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DOI: https://doi.org/10.4093/dmj.2022.0244
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- Background
CycloZ, a combination of cyclo-His-Pro and zinc, has anti-diabetic activity. However, its exact mode of action remains to be elucidated.
Methods KK-Ay mice, a type 2 diabetes mellitus (T2DM) model, were administered CycloZ either as a preventive intervention, or as a therapy. Glycemic control was evaluated using the oral glucose tolerance test (OGTT), and glycosylated hemoglobin (HbA1c) levels. Liver and visceral adipose tissues (VATs) were used for histological evaluation, gene expression analysis, and protein expression analysis.
Results CycloZ administration improved glycemic control in KK-Ay mice in both prophylactic and therapeutic studies. Lysine acetylation of peroxisome proliferator-activated receptor gamma coactivator 1-alpha, liver kinase B1, and nuclear factor-κB p65 was decreased in the liver and VATs in CycloZ-treated mice. In addition, CycloZ treatment improved mitochondrial function, lipid oxidation, and inflammation in the liver and VATs of mice. CycloZ treatment also increased the level of β-nicotinamide adenine dinucleotide (NAD+), which affected the activity of deacetylases, such as sirtuin 1 (Sirt1).
Conclusion Our findings suggest that the beneficial effects of CycloZ on diabetes and obesity occur through increased NAD+ synthesis, which modulates Sirt1 deacetylase activity in the liver and VATs. Given that the mode of action of an NAD+ booster or Sirt1 deacetylase activator is different from that of traditional T2DM drugs, CycloZ would be considered a novel therapeutic option for the treatment of T2DM.
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Citations
Citations to this article as recorded by
- Cyclo His‐Pro Attenuates Muscle Degeneration in Murine Myopathy Models
Alessia De Masi, Nadège Zanou, Keno Strotjohann, Dohyun Lee, Tanes I. Lima, Xiaoxu Li, Jongsu Jeon, Nicolas Place, Hoe‐Yune Jung, Johan Auwerx Advanced Science.2024;[Epub] CrossRef - CycloZ Suppresses TLR4-Driven Inflammation to Reduce Asthma-Like Responses in HDM-Exposed Mouse Models
Dohyun Lee, Jongsu Jeon, Seoyeong Baek, Onyu Park, Ah-Ram Kim, Myoung-Sool Do, Hoe-Yune Jung Cells.2024; 13(23): 2034. CrossRef - Cyclic Peptides as Protein Kinase Modulators and Their Involvement in the Treatment of Diverse Human Diseases
Lorena Martínez-Alcantar, Laura Hernández-Padilla, Alma Laura Díaz-Pérez, Lizbeth Guadalupe Villalón-Magallán, Mayra Xóchitl Durán-Maldonado, César Díaz-Pérez, Marlene E. Campos-Morales, Citlali Figueroa-Guzmán, Jesús Campos-García Kinases and Phosphatases.2024; 2(4): 346. CrossRef
- Obesity and Metabolic Syndrome
- Role of the Pyruvate Dehydrogenase Complex in Metabolic Remodeling: Differential Pyruvate Dehydrogenase Complex Functions in Metabolism
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Sungmi Park, Jae-Han Jeon, Byong-Keol Min, Chae-Myeong Ha, Themis Thoudam, Bo-Yoon Park, In-Kyu Lee
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Diabetes Metab J. 2018;42(4):270-281. Published online August 21, 2018
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DOI: https://doi.org/10.4093/dmj.2018.0101
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PDFPubReader
Mitochondrial dysfunction is a hallmark of metabolic diseases such as obesity, type 2 diabetes mellitus, neurodegenerative diseases, and cancers. Dysfunction occurs in part because of altered regulation of the mitochondrial pyruvate dehydrogenase complex (PDC), which acts as a central metabolic node that mediates pyruvate oxidation after glycolysis and fuels the Krebs cycle to meet energy demands. Fine-tuning of PDC activity has been mainly attributed to post-translational modifications of its subunits, including the extensively studied phosphorylation and de-phosphorylation of the E1α subunit of pyruvate dehydrogenase (PDH), modulated by kinases (pyruvate dehydrogenase kinase [PDK] 1-4) and phosphatases (pyruvate dehydrogenase phosphatase [PDP] 1-2), respectively. In addition to phosphorylation, other covalent modifications, including acetylation and succinylation, and changes in metabolite levels via metabolic pathways linked to utilization of glucose, fatty acids, and amino acids, have been identified. In this review, we will summarize the roles of PDC in diverse tissues and how regulation of its activity is affected in various metabolic disorders.
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