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Hu SH, Feng YY, Yang YX, Ma HD, Zhou SX, Qiao YN, Zhang KH, Zhang L, Huang L, Yuan YY, Lin Y, Zhang XY, Li Y, Li HT, Zhao JY, Xu W, Zhao SM. Amino acids downregulate SIRT4 to detoxify ammonia through the urea cycle. Nat Metab 2023; 5:626-641. [PMID: 37081161 DOI: 10.1038/s42255-023-00784-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/17/2022] [Accepted: 03/10/2023] [Indexed: 04/22/2023]
Abstract
Ammonia production via glutamate dehydrogenase is inhibited by SIRT4, a sirtuin that displays both amidase and non-amidase activities. The processes underlying the regulation of ammonia removal by amino acids remain unclear. Here, we report that SIRT4 acts as a decarbamylase that responds to amino acid sufficiency and regulates ammonia removal. Amino acids promote lysine 307 carbamylation (OTCCP-K307) of ornithine transcarbamylase (OTC), which activates OTC and the urea cycle. Proteomic and interactome screening identified OTC as a substrate of SIRT4. SIRT4 decarbamylates OTCCP-K307 and inactivates OTC in an NAD+-dependent manner. SIRT4 expression was transcriptionally upregulated by the amino acid insufficiency-activated GCN2-eIF2α-ATF4 axis. SIRT4 knockout in cultured cells caused higher OTCCP-K307 levels, activated OTC, elevated urea cycle intermediates and urea production via amino acid catabolism. Sirt4 ablation decreased male mouse blood ammonia levels and ameliorated CCl4-induced hepatic encephalopathy phenotypes. We reveal that SIRT4 safeguards cellular ammonia toxicity during amino acid catabolism.
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Affiliation(s)
- Song-Hua Hu
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodelling and Health, State Key Laboratory of Genetic Engineering, and Institutes of Biomedical Sciences, and Children's Hospital of Fudan University, Fudan University, Shanghai, China
| | - Yu-Yang Feng
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodelling and Health, State Key Laboratory of Genetic Engineering, and Institutes of Biomedical Sciences, and Children's Hospital of Fudan University, Fudan University, Shanghai, China
- Key Laboratory for Tibet Plateau Phytochemistry of Qinghai Province, College of Pharmacy, Qinghai University for Nationalities, Xining, China
| | - Yuan-Xin Yang
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodelling and Health, State Key Laboratory of Genetic Engineering, and Institutes of Biomedical Sciences, and Children's Hospital of Fudan University, Fudan University, Shanghai, China
| | - Hui-Da Ma
- MOE Key Laboratory of Protein Sciences, Beijing Advanced Innovation Center for Structural Biology, Beijing Frontier Research Center for Biological Structure, Tsinghua-Peking Joint Centre for Life Sciences, Department of Basic Medical Sciences, School of Medicine, Tsinghua University, Beijing, China
| | - Shu-Xian Zhou
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodelling and Health, State Key Laboratory of Genetic Engineering, and Institutes of Biomedical Sciences, and Children's Hospital of Fudan University, Fudan University, Shanghai, China
| | - Ya-Nan Qiao
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodelling and Health, State Key Laboratory of Genetic Engineering, and Institutes of Biomedical Sciences, and Children's Hospital of Fudan University, Fudan University, Shanghai, China
| | - Kai-Hui Zhang
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodelling and Health, State Key Laboratory of Genetic Engineering, and Institutes of Biomedical Sciences, and Children's Hospital of Fudan University, Fudan University, Shanghai, China
| | - Lei Zhang
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodelling and Health, State Key Laboratory of Genetic Engineering, and Institutes of Biomedical Sciences, and Children's Hospital of Fudan University, Fudan University, Shanghai, China
| | - Lin Huang
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodelling and Health, State Key Laboratory of Genetic Engineering, and Institutes of Biomedical Sciences, and Children's Hospital of Fudan University, Fudan University, Shanghai, China
| | - Yi-Yuan Yuan
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodelling and Health, State Key Laboratory of Genetic Engineering, and Institutes of Biomedical Sciences, and Children's Hospital of Fudan University, Fudan University, Shanghai, China
| | - Yan Lin
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodelling and Health, State Key Laboratory of Genetic Engineering, and Institutes of Biomedical Sciences, and Children's Hospital of Fudan University, Fudan University, Shanghai, China
- Key Laboratory for Tibet Plateau Phytochemistry of Qinghai Province, College of Pharmacy, Qinghai University for Nationalities, Xining, China
| | - Xin-Yan Zhang
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodelling and Health, State Key Laboratory of Genetic Engineering, and Institutes of Biomedical Sciences, and Children's Hospital of Fudan University, Fudan University, Shanghai, China
- Key Laboratory for Tibet Plateau Phytochemistry of Qinghai Province, College of Pharmacy, Qinghai University for Nationalities, Xining, China
| | - Yao Li
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodelling and Health, State Key Laboratory of Genetic Engineering, and Institutes of Biomedical Sciences, and Children's Hospital of Fudan University, Fudan University, Shanghai, China
| | - Hai-Tao Li
- MOE Key Laboratory of Protein Sciences, Beijing Advanced Innovation Center for Structural Biology, Beijing Frontier Research Center for Biological Structure, Tsinghua-Peking Joint Centre for Life Sciences, Department of Basic Medical Sciences, School of Medicine, Tsinghua University, Beijing, China
| | - Jian-Yuan Zhao
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodelling and Health, State Key Laboratory of Genetic Engineering, and Institutes of Biomedical Sciences, and Children's Hospital of Fudan University, Fudan University, Shanghai, China.
| | - Wei Xu
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodelling and Health, State Key Laboratory of Genetic Engineering, and Institutes of Biomedical Sciences, and Children's Hospital of Fudan University, Fudan University, Shanghai, China.
- Key Laboratory for Tibet Plateau Phytochemistry of Qinghai Province, College of Pharmacy, Qinghai University for Nationalities, Xining, China.
| | - Shi-Min Zhao
- The Obstetrics & Gynecology Hospital of Fudan University, Shanghai Key Laboratory of Metabolic Remodelling and Health, State Key Laboratory of Genetic Engineering, and Institutes of Biomedical Sciences, and Children's Hospital of Fudan University, Fudan University, Shanghai, China.
- Key Laboratory for Tibet Plateau Phytochemistry of Qinghai Province, College of Pharmacy, Qinghai University for Nationalities, Xining, China.
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Suárez I, Bodega G, Rubio M, Fernández B. Reduced TH expression and α-synuclein accumulation contribute towards nigrostriatal dysfunction in experimental hepatic encephalopathy. Restor Neurol Neurosci 2017; 35:469-481. [PMID: 28984618 DOI: 10.3233/rnn-170728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
PURPOSE The present work examines α-synuclein expression in the nigrostriatal system of a rat chronic hepatic encephalopathy model induced by portacaval anastomosis (PCA). There is evidence that dopaminergic dysfunction in disease conditions is strongly associated with such expression. Possible relationships among dopaminergic neurons, astroglial cells and α-synuclein expression were sought. METHODS Brain tissue samples from rats at 1 and 6 months post-PCA, and controls, were analysed immunohistochemically using antibodies against tyrosine hydroxylase (TH), α-synuclein, glial fibrillary acidic protein (GFAP) and ubiquitin (Ub). RESULTS In the control rats, TH immunoreactivity was detected in the neuronal cell bodies and processes in the substantia nigra pars compacta (SNc). A dense TH-positive network of neurons was also seen in the striatum. In the PCA-exposed rats, however, a reduction in TH-positive neurons was seen at both 1 and 6 months in the SNc, as well as a reduction in TH-positive fibres in the striatum. This was coincident with the appearance of α-synuclein-immunoreactive neurons in the SNc; some of the TH-positive neurons also showed α-synuclein immunoreactivity. In addition, α-synuclein accumulation was seen in the SNc and striatum at both 1 and 6 months post-PCA, whereas α-synuclein was only mildly expressed in the nigrostriatal pathway of the controls. Astrogliosis was also seen following PCA, as revealed by increased GFAP expression from 1 month to 6 months post-PCA in both the SN and striatum. The astroglial activation level in the SN paralleled the reduced neuronal expression of TH throughout PCA exposure. CONCLUSION α-synuclein accumulation following PCA may induce dopaminergic dysfunction via the downregulation of TH, as well as astroglial activation.
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Affiliation(s)
- Isabel Suárez
- Departamento de Biomedicina y Biotecnología, Universidad de Alcalá, Madrid, Spain
| | - Guillermo Bodega
- Departamento de Biomedicina y Biotecnología, Universidad de Alcalá, Madrid, Spain
| | - Miguel Rubio
- Departamento de Biomedicina y Biotecnología, Universidad de Alcalá, Madrid, Spain
| | - Benjamín Fernández
- Departamento de Biología Celular, Universidad Complutense, Madrid, Spain
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Peixoto CA, Nunes AKS, Garcia-Osta A. Phosphodiesterase-5 Inhibitors: Action on the Signaling Pathways of Neuroinflammation, Neurodegeneration, and Cognition. Mediators Inflamm 2015; 2015:940207. [PMID: 26770022 PMCID: PMC4681825 DOI: 10.1155/2015/940207] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Accepted: 11/08/2015] [Indexed: 12/16/2022] Open
Abstract
Phosphodiesterase type 5 inhibitors (PDE5-Is) have recently emerged as a potential therapeutic strategy for neuroinflammatory, neurodegenerative, and memory loss diseases. Mechanistically, PDE5-Is produce an anti-inflammatory and neuroprotection effect by increasing expression of nitric oxide synthases and accumulation of cGMP and activating protein kinase G (PKG), the signaling pathway of which is thought to play an important role in the development of several neurodiseases, such as Alzheimer's disease (AD), Parkinson's disease (PD), and multiple sclerosis (MS). The aim of this paper was to review present knowledge of the signaling pathways that underlie the use of PDE5-Is in neuroinflammation, neurogenesis, learning, and memory.
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Affiliation(s)
- Christina Alves Peixoto
- 1Laboratório de Ultraestrutura, Centro de Pesquisa Aggeu Magalhães (FIOCRUZ), 50.740-465 Recife, PE, Brazil
- *Christina Alves Peixoto:
| | - Ana Karolina Santana Nunes
- 1Laboratório de Ultraestrutura, Centro de Pesquisa Aggeu Magalhães (FIOCRUZ), 50.740-465 Recife, PE, Brazil
- 2Universidade Federal de Pernambuco, 50.670-901 Recife, PE, Brazil
| | - Ana Garcia-Osta
- 3Neurobiology of Alzheimer's disease, Neurosciences Division, Center for Applied Medical Research (CIMA), University of Navarra, Pamplona, Spain
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Kanai H, Marushima H, Kimura N, Iwaki T, Saito M, Maehashi H, Shimizu K, Muto M, Masaki T, Ohkawa K, Yokoyama K, Nakayama M, Harada T, Hano H, Hataba Y, Fukuda T, Nakamura M, Totsuka N, Ishikawa S, Unemura Y, Ishii Y, Yanaga K, Matsuura T. Extracorporeal bioartificial liver using the radial-flow bioreactor in treatment of fatal experimental hepatic encephalopathy. Artif Organs 2007; 31:148-51. [PMID: 17298404 DOI: 10.1111/j.1525-1594.2007.00354.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An extracorporeal bioartificial liver (BAL) that could prevent death from hepatic encephalopathy in acute hepatic insufficiency was aimed to develop. A functional human hepatocellular carcinoma cell line (FLC-4) was cultured in a radial-flow bioreactor. The function of the BAL was tested in mini-pigs with acute hepatic failure induced by alpha-amanitin and lipopolysaccharide. When the BAL system was connected with cultured FLC-4 to three pigs with hepatic dysfunction, all demonstrated electroencephalographic improvement and survived. Relatively low plasma concentrations of S-100 beta protein, as a marker of astrocytic damage, from pigs with hepatic failure during BAL therapy were noted. BAL therapy can prevent irreversible brain damage from hepatic encephalopathy in experimental acute hepatic failure.
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Affiliation(s)
- Hideki Kanai
- Department of Surgery, The Jikei University School of Medicine, Tokyo, Japan
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Hernández R, Martínez-Lara E, Del Moral ML, Blanco S, Cañuelo A, Siles E, Esteban FJ, Pedrosa JA, Peinado MA. Upregulation of endothelial nitric oxide synthase maintains nitric oxide production in the cerebellum of thioacetamide cirrhotic rats. Neuroscience 2004; 126:879-87. [PMID: 15207323 DOI: 10.1016/j.neuroscience.2004.04.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/06/2004] [Indexed: 02/01/2023]
Abstract
This study examines the expression and cellular distribution pattern of nitric oxide synthase (NOS) isoforms, nitrotyrosine-derived complexes, and the nitric oxide (NO) production in the cerebellum of rats with cirrhosis induced by thioacetamide (TAA). The results showed local changes in the tissue distribution pattern of the NOS isoforms and nitrated proteins in the cerebellum of these animals. Particularly, eNOS immunoreactivity in perivascular glial cells of the white matter was detected only in TAA-treated animals. In addition, although neither neuronal NOS (nNOS) nor inducible NOS (iNOS) cerebellar protein levels appeared to be affected, the endothelial NOS (eNOS) isoform significantly increased its expression, and NO production slightly augmented in TAA-treated rats. These NOS/NO changes may contribute differently to the evolution of the hepatic disease either by maintaining the guanosine monophosphate-NO signal transduction pathways and the physiological cerebellar functions or by inducing oxidative stress and cell damage. This model gives rise to the hypothesis that the upregulation of the eNOS maintains the physiological production of NO, while the iNOS is silenced and the nNOS remains unchanged. The differential NOS-distribution and expression pattern may be one of the mechanisms involved to balance cerebellar NO production in order to minimize TAA toxic injury. These data help elucidate the role of the NOS/NO system in the development and progress of hepatic encephalopathy associated with TAA cirrhosis.
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Affiliation(s)
- R Hernández
- Department of Experimental Biology (Edf B3), University of Jaén, Paraje Las Lagunillas s/n, 23071 Jaén, Spain
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