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Lee JU, Song KS, Hong J, Shin H, Park E, Baek J, Park S, Baek AR, Lee J, Jang AS, Kim DJ, Chin SS, Kim UJ, Jeong SH, Park SW. Role of lung ornithine aminotransferase in idiopathic pulmonary fibrosis: regulation of mitochondrial ROS generation and TGF-β1 activity. Exp Mol Med 2024; 56:478-490. [PMID: 38413821 PMCID: PMC10907606 DOI: 10.1038/s12276-024-01170-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 11/12/2023] [Accepted: 11/23/2023] [Indexed: 02/29/2024] Open
Abstract
Idiopathic pulmonary fibrosis (IPF) is characterized by aberrant lung remodeling and the excessive accumulation of extracellular matrix (ECM) proteins. In a previous study, we found that the levels of ornithine aminotransferase (OAT), a principal enzyme in the proline metabolism pathway, were increased in the lungs of patients with IPF. However, the precise role played by OAT in the pathogenesis of IPF is not yet clear. The mechanism by which OAT affects fibrogenesis was assessed in vitro using OAT-overexpressing and OAT-knockdown lung fibroblasts. The therapeutic effects of OAT inhibition were assessed in the lungs of bleomycin-treated mice. OAT expression was increased in fibrotic areas, principally in interstitial fibroblasts, of lungs affected by IPF. OAT levels in the bronchoalveolar lavage fluid of IPF patients were inversely correlated with lung function. The survival rate was significantly lower in the group with an OAT level >75.659 ng/mL than in the group with an OAT level ≤75.659 ng/mL (HR, 29.53; p = 0.0008). OAT overexpression and knockdown increased and decreased ECM component production by lung fibroblasts, respectively. OAT knockdown also inhibited transforming growth factor-β1 (TGF)-β1 activity and TGF-β1 pathway signaling. OAT overexpression increased the generation of mitochondrial reactive oxygen species (ROS) by activating proline dehydrogenase. The OAT inhibitor L-canaline significantly attenuated bleomycin-induced lung injury and fibrosis. In conclusion, increased OAT levels in lungs affected by IPF contribute to the progression of fibrosis by promoting excessive mitochondrial ROS production, which in turn activates TGF-β1 signaling. OAT may be a useful target for treating patients with fibrotic lung diseases, including IPF.
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Affiliation(s)
- Jong-Uk Lee
- Division of Allergy and Respiratory Medicine, Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, 14584, Gyeonggi-Do, South Korea
| | - Ki Sung Song
- Division of Allergy and Respiratory Medicine, Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, 14584, Gyeonggi-Do, South Korea
| | - Jisu Hong
- Division of Allergy and Respiratory Medicine, Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, 14584, Gyeonggi-Do, South Korea
| | - Hyesun Shin
- Division of Allergy and Respiratory Medicine, Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, 14584, Gyeonggi-Do, South Korea
| | - Eunji Park
- Division of Allergy and Respiratory Medicine, Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, 14584, Gyeonggi-Do, South Korea
| | - Junyeong Baek
- Division of Allergy and Respiratory Medicine, Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, 14584, Gyeonggi-Do, South Korea
| | - Shinhee Park
- Division of Allergy and Respiratory Medicine, Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, 14584, Gyeonggi-Do, South Korea
| | - Ae-Rin Baek
- Division of Allergy and Respiratory Medicine, Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, 14584, Gyeonggi-Do, South Korea
| | - Junehyuk Lee
- Division of Allergy and Respiratory Medicine, Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, 14584, Gyeonggi-Do, South Korea
| | - An Soo Jang
- Division of Allergy and Respiratory Medicine, Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, 14584, Gyeonggi-Do, South Korea
| | - Do Jin Kim
- Division of Allergy and Respiratory Medicine, Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, 14584, Gyeonggi-Do, South Korea
| | - Su Sie Chin
- Department of Pathology, Soonchunhyang University Bucheon Hospital, Bucheon, 14584, Gyeonggi-Do, South Korea
| | - U-Jin Kim
- Department of Internal Medicine, Environmental Health Center Kangwon National University, Gangwondaehakgil, Chuncheon-si, Gangwon-do, South Korea
| | - Sung Hwan Jeong
- Department of Allergy, Pulmonary and Critical Care Medicine, Gachon University, Gil Medical Center, Incheon, South Korea
| | - Sung-Woo Park
- Division of Allergy and Respiratory Medicine, Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, 14584, Gyeonggi-Do, South Korea.
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Singh C. Systems levels analysis of lipid metabolism in oxygen-induced retinopathy. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.11.21.568200. [PMID: 38045301 PMCID: PMC10690220 DOI: 10.1101/2023.11.21.568200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/05/2023]
Abstract
Hyperoxia induces glutamine-fueled anaplerosis in the Muller cells, endothelial cells, and retinal explants. Anaplerosis takes away glutamine from the biosynthetic pathway to the energy-producing TCA cycle. This process depletes biosynthetic precursors from newly proliferating endothelial cells. The induction of anaplerosis in the hyperoxic retina is a compensatory response, either to decreased glycolysis or decreased flux from glycolysis to the TCA cycle. We hypothesized that by providing substrates that feed into TCA, we could reverse or prevent glutamine-fueled anaplerosis, thereby abating the glutamine wastage for energy generation. Using an oxygen-induced retinopathy (OIR) mouse model, we first compared the difference in fatty acid metabolism between OIR-resistant BALB/cByJ and OIR susceptible C57BL/6J strains to understand if these strains exhibit metabolic difference that protects BALB/cByJ from the hyperoxic conditions and prevents their vasculature in oxygen-induced retinopathy model. Based on our findings from the metabolic comparison between two mouse strains, we hypothesized that the medium-chain fatty acid, octanoate, can feed into the TCA and serve as an alternative energy source in response to hyperoxia. Our systems levels analysis of OIR model shows that the medium chain fatty acid can serve as an alternative source to feed TCA. We here, for the first time, demonstrate that the retina can use medium-chain fatty acid octanoate to replenish TCA in normoxic and at a higher rate in hyperoxic conditions.
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Masson F, Rommelaere S, Schüpfer F, Boquete JP, Lemaitre B. Disproportionate investment in Spiralin B production limits in-host growth and favors the vertical transmission of Spiroplasma insect endosymbionts. Proc Natl Acad Sci U S A 2022; 119:e2208461119. [PMID: 35858432 PMCID: PMC9335233 DOI: 10.1073/pnas.2208461119] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Accepted: 06/10/2022] [Indexed: 01/21/2023] Open
Abstract
Insects frequently harbor endosymbionts, which are bacteria housed within host tissues. These associations are stably maintained over evolutionary timescales through vertical transmission of endosymbionts from host mothers to their offspring. Some endosymbionts manipulate host reproduction to facilitate spread within natural populations. Consequently, such infections have major impacts on insect physiology and evolution. However, technical hurdles have limited our understanding of the molecular mechanisms underlying such insect-endosymbiont interactions. Here, we investigate the nutritional interactions between endosymbiotic partners using the tractable insect Drosophila melanogaster and its natural endosymbiont Spiroplasma poulsonii. Using a combination of functional assays, metabolomics, and proteomics, we show that the abundance and amino acid composition of a single Spiroplasma membrane lectin, Spiralin B (SpiB), dictates the amino acid requirements of the endosymbiont and determines its proliferation within host tissues. Ectopically increasing SpiB levels in host tissues disrupts localization of endosymbionts in the fly egg chambers and decreases vertical transmission. We find that SpiB is likely to be required by the endosymbiont to enter host oocytes, which may explain the massive investment of S. poulsonii in SpiB synthesis. SpiB both permits vertical transmission of the symbiont and limits its growth in nutrient-limiting conditions for the host; therefore, a single protein plays a pivotal role in ensuring durability of the interaction in a variable environment.
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Affiliation(s)
- Florent Masson
- Global Health Institute, School of Life Sciences, École Polytechnique Fédérale de Lausanne, Lausanne, 1015 Switzerland
| | - Samuel Rommelaere
- Global Health Institute, School of Life Sciences, École Polytechnique Fédérale de Lausanne, Lausanne, 1015 Switzerland
| | - Fanny Schüpfer
- Global Health Institute, School of Life Sciences, École Polytechnique Fédérale de Lausanne, Lausanne, 1015 Switzerland
| | - Jean-Philippe Boquete
- Global Health Institute, School of Life Sciences, École Polytechnique Fédérale de Lausanne, Lausanne, 1015 Switzerland
| | - Bruno Lemaitre
- Global Health Institute, School of Life Sciences, École Polytechnique Fédérale de Lausanne, Lausanne, 1015 Switzerland
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Liput KP, Lepczyński A, Nawrocka A, Poławska E, Ogłuszka M, Jończy A, Grzybek W, Liput M, Szostak A, Urbański P, Roszczyk A, Pareek CS, Pierzchała M. Effects of Three-Month Administration of High-Saturated Fat Diet and High-Polyunsaturated Fat Diets with Different Linoleic Acid (LA, C18:2n-6) to α-Linolenic Acid (ALA, C18:3n-3) Ratio on the Mouse Liver Proteome. Nutrients 2021; 13:1678. [PMID: 34063343 PMCID: PMC8156955 DOI: 10.3390/nu13051678] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2021] [Accepted: 05/12/2021] [Indexed: 12/13/2022] Open
Abstract
The aim of the study was to evaluate the effect of different types of high-fat diets (HFDs) on the proteomic profile of mouse liver. The analysis included four dietary groups of mice fed a standard diet (STD group), a high-fat diet rich in SFAs (SFA group), and high-fat diets dominated by PUFAs with linoleic acid (LA, C18:2n-6) to α-linolenic acid (ALA, C18:3n-3) ratios of 14:1 (14:1 group) and 5:1 (5:1 group). After three months of diets, liver proteins were resolved by two-dimensional gel electrophoresis (2DE) using 17 cm non-linear 3-10 pH gradient strips. Protein spots with different expression were identified by MALDI-TOF/TOF. The expression of 13 liver proteins was changed in the SFA group compared to the STD group (↓: ALB, APOA1, IVD, MAT1A, OAT and PHB; ↑: ALDH1L1, UniProtKB-Q91V76, GALK1, GPD1, HMGCS2, KHK and TKFC). Eleven proteins with altered expression were recorded in the 14:1 group compared to the SFA group (↓: ARG1, FTL1, GPD1, HGD, HMGCS2 and MAT1A; ↑: APOA1, CA3, GLO1, HDHD3 and IVD). The expression of 11 proteins was altered in the 5:1 group compared to the SFA group (↓: ATP5F1B, FTL1, GALK1, HGD, HSPA9, HSPD1, PC and TKFC; ↑: ACAT2, CA3 and GSTP1). High-PUFA diets significantly affected the expression of proteins involved in, e.g., carbohydrate metabolism, and had varying effects on plasma total cholesterol and glucose levels. The outcomes of this study revealed crucial liver proteins affected by different high-fat diets.
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Affiliation(s)
- Kamila P. Liput
- Department of Genomics and Biodiversity, Institute of Genetics and Animal Biotechnology of the Polish Academy of Sciences, ul. Postepu 36A, Jastrzebiec, 05-552 Magdalenka, Poland; (K.P.L.); (A.N.); (E.P.); (M.O.); (A.S.); (P.U.); (A.R.)
- Department of Molecular Biology, Institute of Genetics and Animal Biotechnology of the Polish Academy of Sciences, ul. Postepu 36A, Jastrzebiec, 05-552 Magdalenka, Poland;
| | - Adam Lepczyński
- Department of Physiology, Cytobiology and Proteomics, West Pomeranian University of Technology, K. Janickiego 32 Str., 71-270 Szczecin, Poland;
| | - Agata Nawrocka
- Department of Genomics and Biodiversity, Institute of Genetics and Animal Biotechnology of the Polish Academy of Sciences, ul. Postepu 36A, Jastrzebiec, 05-552 Magdalenka, Poland; (K.P.L.); (A.N.); (E.P.); (M.O.); (A.S.); (P.U.); (A.R.)
- Department of Experimental Genomics, Institute of Genetics and Animal Biotechnology of the Polish Academy of Sciences, ul. Postepu 36A, Jastrzebiec, 05-552 Magdalenka, Poland
| | - Ewa Poławska
- Department of Genomics and Biodiversity, Institute of Genetics and Animal Biotechnology of the Polish Academy of Sciences, ul. Postepu 36A, Jastrzebiec, 05-552 Magdalenka, Poland; (K.P.L.); (A.N.); (E.P.); (M.O.); (A.S.); (P.U.); (A.R.)
| | - Magdalena Ogłuszka
- Department of Genomics and Biodiversity, Institute of Genetics and Animal Biotechnology of the Polish Academy of Sciences, ul. Postepu 36A, Jastrzebiec, 05-552 Magdalenka, Poland; (K.P.L.); (A.N.); (E.P.); (M.O.); (A.S.); (P.U.); (A.R.)
| | - Aneta Jończy
- Department of Molecular Biology, Institute of Genetics and Animal Biotechnology of the Polish Academy of Sciences, ul. Postepu 36A, Jastrzebiec, 05-552 Magdalenka, Poland;
| | - Weronika Grzybek
- Department of Biotechnology and Nutrigenomics, Institute of Genetics and Animal Biotechnology of the Polish Academy of Sciences, ul. Postepu 36A, Jastrzebiec, 05-552 Magdalenka, Poland;
| | - Michał Liput
- Department of Stem Cell Bioengineering, Mossakowski Medical Research Institute of the Polish Academy of Sciences, 02-106 Warsaw, Poland;
| | - Agnieszka Szostak
- Department of Genomics and Biodiversity, Institute of Genetics and Animal Biotechnology of the Polish Academy of Sciences, ul. Postepu 36A, Jastrzebiec, 05-552 Magdalenka, Poland; (K.P.L.); (A.N.); (E.P.); (M.O.); (A.S.); (P.U.); (A.R.)
| | - Paweł Urbański
- Department of Genomics and Biodiversity, Institute of Genetics and Animal Biotechnology of the Polish Academy of Sciences, ul. Postepu 36A, Jastrzebiec, 05-552 Magdalenka, Poland; (K.P.L.); (A.N.); (E.P.); (M.O.); (A.S.); (P.U.); (A.R.)
| | - Agnieszka Roszczyk
- Department of Genomics and Biodiversity, Institute of Genetics and Animal Biotechnology of the Polish Academy of Sciences, ul. Postepu 36A, Jastrzebiec, 05-552 Magdalenka, Poland; (K.P.L.); (A.N.); (E.P.); (M.O.); (A.S.); (P.U.); (A.R.)
| | - Chandra S. Pareek
- Institute of Veterinary Medicine, Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University, 87-100 Toruń, Poland;
- Division of Functional Genomics in Biological and Biomedical Research, Centre for Modern Interdisciplinary Technologies, Nicolaus Copernicus University, 87-100 Torun, Poland
| | - Mariusz Pierzchała
- Department of Genomics and Biodiversity, Institute of Genetics and Animal Biotechnology of the Polish Academy of Sciences, ul. Postepu 36A, Jastrzebiec, 05-552 Magdalenka, Poland; (K.P.L.); (A.N.); (E.P.); (M.O.); (A.S.); (P.U.); (A.R.)
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Meier M, Knudsen AR, Andersen KJ, Ludvigsen M, Eriksen PL, Pedersen AKN, Honoré B, Mortensen FV. Perturbations of urea cycle enzymes during posthepatectomy rat liver failure. Am J Physiol Gastrointest Liver Physiol 2019; 317:G429-G440. [PMID: 31373508 DOI: 10.1152/ajpgi.00293.2018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Posthepatectomy liver failure (PHLF) may occur after extended partial hepatectomy (PH). If malignancy is widespread in the liver, the size of PH and hence the size of the future liver remnant (FLR) may limit curability. We aimed to characterize differences in protein expression between different sizes of FLRs and identify proteins specific to the regenerative process of minimal-size FLR (MSFLR), with special focus on postoperative day (POD) 1 when PHLF is present. A total of 104 male Wistar rats were subjected to 30, 70, or 90% PH (MSFLR in rats), sham operation, or no operation. Blood and liver tissue were harvested at POD1, 3, and 5 (n = 8 per group). Protein expression was assessed by proteomic profiling by unsupervised two-dimensional polyacrylamide gel electrophoresis (2D-PAGE) liquid chromatography tandem mass spectrometry (LC-MS/MS), followed by supervised selected reaction monitoring (SRM)-MS/MS. In all, 1,035 protein spots were detected, 54 of which were significantly differentially expressed between groups and identifiable. During PHLF after PH(90%) at POD1, urea cycle and related proteins showed significant perturbations, including the urea cycle flux-regulating enzyme of carbamoyl phosphate synthase-1, ornithine transcarbamylase, and arginase-1, as well as the ornithine aminotransferase and propionyl-CoA carboxylase alpha chain. Plasma-ammonia increased significantly at POD1 after PH(90%), followed by a prompt decrease. At the protein level, we found perturbations of urea cycle and related enzymes in the MSFLR during PHLF. Our results suggest that these perturbations may augment urea cycle function, which may be pivotal for increased ammonia elimination after extensive PHs and potential PHLF.NEW & NOTEWORTHY Posthepatectomy liver failure (PHLF) is associated with high mortality. In a rat model of 90% hepatectomy, PHLF is present. Our results on liver tissue proteomics suggest that the ability of the liver remnant to sufficiently eliminate ammonia may be brought about by perturbation related to urea cycle proteins and that enhancing the urea cycle capacity may play a key role in surviving PHLF.
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Affiliation(s)
- Michelle Meier
- Department of Surgery, Section for Upper Gastrointestinal and Hepatico-Pancreatico-Biliary Surgery, Aarhus University Hospital, Aarhus, Denmark
| | - Anders Riegels Knudsen
- Department of Surgery, Section for Upper Gastrointestinal and Hepatico-Pancreatico-Biliary Surgery, Aarhus University Hospital, Aarhus, Denmark
| | - Kasper Jarlhelt Andersen
- Department of Surgery, Section for Upper Gastrointestinal and Hepatico-Pancreatico-Biliary Surgery, Aarhus University Hospital, Aarhus, Denmark
| | - Maja Ludvigsen
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Peter Lykke Eriksen
- Department of Hepatology and Gastroenterology, Aarhus University Hospital, Aarhus, Denmark
| | | | - Bent Honoré
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Frank Viborg Mortensen
- Department of Surgery, Section for Upper Gastrointestinal and Hepatico-Pancreatico-Biliary Surgery, Aarhus University Hospital, Aarhus, Denmark
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Hu L, Xu B, Wang Y, Wang M, Wang H. Influence of arginine on enzymes related to arginine metabolism in bovine mammary epithelial cells in vitro. CANADIAN JOURNAL OF ANIMAL SCIENCE 2019. [DOI: 10.1139/cjas-2017-0215] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Bovine mammary epithelial cells were used to evaluate the effects of different levels of Arginine (Arg) on enzymes related to Arg metabolism. A series of seven Arg concentrations in the medium as treatments were T0 (0.00 mg L−1) as control group, and T0.25 (69.50 mg L−1), T0.5 (139.00 mg L−1), T1 (278.00 mg L−1), T2 (556.00 mg L−1), T4 (1112.00 mg L−1), and T8 (2224.00 mg L−1) as experiment groups, respectively. The quantitative polymerase chain reaction and enzyme-linked immunosorbent assay analysis showed that the nitric oxide concentration, the expressions of endothelial nitric oxide synthase in mRNA, and enzyme level were all increased in response to enhanced Arg doses such that the T8 was the greatest group (P < 0.05). Four-fold Arg concentration improved gene expression and synthesis of arginase which then deceased when excessive Arg was supplied (P < 0.05). The expressions of ornithine aminotransferase mRNA and enzyme in T1 and T2 groups were significantly greater than that in the other groups (P < 0.05). Two-fold Arg was the optimum level for ornithine decarboxylase gene expression and enzyme synthesis among all seven treatments (P < 0.05). These somewhat various effects of Arg concentrations on four kinds of enzymes in different Arg metabolic pathways suggest that Arg might participate in regulating bovine mammary physiological function with an optimum concentration by influencing the enzymes in related metabolic pathways.
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Affiliation(s)
- Liangyu Hu
- School of Animal Science and Technology, Yangzhou University, Yangzhou, Jiangsu 225009, People’s Republic of China
| | - Bolin Xu
- School of Animal Science and Technology, Yangzhou University, Yangzhou, Jiangsu 225009, People’s Republic of China
| | - Yifan Wang
- Medical School of Southeast University, Nanjing, Jiangsu 210009, People’s Republic of China
| | - Mengzhi Wang
- School of Animal Science and Technology, Yangzhou University, Yangzhou, Jiangsu 225009, People’s Republic of China
| | - Hongrong Wang
- School of Animal Science and Technology, Yangzhou University, Yangzhou, Jiangsu 225009, People’s Republic of China
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Xu W, Jin J, Han D, Liu H, Zhu X, Yang Y, Xie S. Physiological and transcriptomic responses to fishmeal-based diet and rapeseed meal-based diet in two strains of gibel carp (Carassius gibelio). FISH PHYSIOLOGY AND BIOCHEMISTRY 2019; 45:267-286. [PMID: 30167883 DOI: 10.1007/s10695-018-0560-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 08/15/2018] [Indexed: 06/08/2023]
Abstract
The present study investigated differences in the utilization of fishmeal (FM) and rapeseed meal (RM) by gibel carp (Carassius gibelio) and explored the effects of protein sources on the responses of different genotypes. Gibel carp strains A (4.12 ± 0.03 g) and F (3.47 ± 0.00 g) were fed FM diet or RM diet for 56 days, and after which, growth performance, body composition, hematologic indices, and hepatic transcriptomes were measured. The effects of strain and diet on growth performance, body composition, and hematologic indices were analyzed by two-way analysis of covariance (ANCOVA). The results revealed that total replacement of FM with RM caused poor growth and feed utilization in both strains as well as the existence of genotype-diet interactions. Strain A showed better growth performance than strain F in the FM group, while the strain F grew better than strain A in the RM group. Transcriptomic analysis showed that the three main biological processes affected by the RM diet were amino acid metabolism, lipid metabolism, and digestive system. The different responses to the RM diet between strains were involved in amino acid metabolism, immune responses, and lipid metabolism. Identifying the underlying mechanisms by which different strains differently respond to meal sources might be the basis to develop a selective breeding program towards strains accepting alternative meal sources.
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Affiliation(s)
- Wenjie Xu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei, China
- University of Chinese Academy of Sciences, Beijing, 100039, China
| | - Junyan Jin
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei, China
| | - Dong Han
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei, China
- Freshwater Aquaculture Collaborative Innovation Centre of Hubei Province, Wuhan, 430070, China
| | - Haokun Liu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei, China
| | - Xiaoming Zhu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei, China
| | - Yunxia Yang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei, China
| | - Shouqi Xie
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei, China.
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Molecular and cellular basis of ornithine δ-aminotransferase deficiency caused by the V332M mutation associated with gyrate atrophy of the choroid and retina. Biochim Biophys Acta Mol Basis Dis 2018; 1864:3629-3638. [DOI: 10.1016/j.bbadis.2018.08.032] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2018] [Revised: 07/27/2018] [Accepted: 08/24/2018] [Indexed: 11/19/2022]
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9
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Evolutionary compromises to metabolic toxins: Ammonia and urea tolerance in Drosophila suzukii and Drosophila melanogaster. Physiol Behav 2018; 191:146-154. [PMID: 29679661 DOI: 10.1016/j.physbeh.2018.04.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2017] [Revised: 04/06/2018] [Accepted: 04/15/2018] [Indexed: 01/19/2023]
Abstract
The invasive pest Drosophila suzukii has evolved morphological and behavioural adaptations to lay eggs under the skin of fresh fruits. This results in severe damage to a wide range of small fruits. Drosophila suzukii females typically lay few eggs per fruit, preferring healthy fruits. Hence, larvae are exposed to a reduced amount of nitrogenous waste. Differently, the innocuous Drosophila melanogaster lays eggs on fermented fruits already infested by conspecifics, with larvae developing in a crowded environment with the accumulation of nitrogenous waste such as ammonia and urea. These compounds derive from nitrogen metabolism, protein degradation, and amino acids catabolism and are relatively toxic at high concentrations in an organism. The observed differences in oviposition site and larval ecological niche suggest that these species might differ in behavioural and physiological mechanisms used to cope with nitrogenous waste. We investigated how different concentrations of ammonia and urea affect oviposition and larval development in both species. Females and larvae of D. suzukii showed greater susceptibility to high concentrations of both compounds, with a dramatic decrease in the number of eggs laid and egg viability. Moreover, we tested the chemotactic response of third instar larvae to high concentrations of the compounds. Interestingly, ammonia resulted in a repulsive behaviour in respect of the control and urea groups. To better understand the pathways underlying these differences, we evaluated the effect on ornithine aminotransferase and glutathione-S-transferase, two enzymes involved in nitrogen metabolism and stress response that are expressed during larval development. Both ammonia and urea significantly reduced the expression of these enzymes in D. suzukii compared to D. melanogaster. This shows how the ecological shift of D. suzukii to fresh fruit is accompanied by less efficient detoxifying and excretory mechanisms, with important implications for evolutionary biology and applied research. Our data suggest that the ecological shift of D. suzukii to fresh fruit as oviposition substrate is accompanied by a reduced tolerance to metabolic toxins during larval development.
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Ginguay A, Cynober L, Curis E, Nicolis I. Ornithine Aminotransferase, an Important Glutamate-Metabolizing Enzyme at the Crossroads of Multiple Metabolic Pathways. BIOLOGY 2017; 6:biology6010018. [PMID: 28272331 PMCID: PMC5372011 DOI: 10.3390/biology6010018] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 02/23/2017] [Accepted: 02/24/2017] [Indexed: 02/06/2023]
Abstract
Ornithine δ-aminotransferase (OAT, E.C. 2.6.1.13) catalyzes the transfer of the δ-amino group from ornithine (Orn) to α-ketoglutarate (aKG), yielding glutamate-5-semialdehyde and glutamate (Glu), and vice versa. In mammals, OAT is a mitochondrial enzyme, mainly located in the liver, intestine, brain, and kidney. In general, OAT serves to form glutamate from ornithine, with the notable exception of the intestine, where citrulline (Cit) or arginine (Arg) are end products. Its main function is to control the production of signaling molecules and mediators, such as Glu itself, Cit, GABA, and aliphatic polyamines. It is also involved in proline (Pro) synthesis. Deficiency in OAT causes gyrate atrophy, a rare but serious inherited disease, a further measure of the importance of this enzyme.
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Affiliation(s)
- Antonin Ginguay
- Clinical Chemistry, Cochin Hospital, GH HUPC, AP-HP, 75014 Paris, France.
- Laboratory of Biological Nutrition, EA 4466 PRETRAM, Faculté de Pharmacie, Université Paris Descartes, 75006 Paris, France.
| | - Luc Cynober
- Clinical Chemistry, Cochin Hospital, GH HUPC, AP-HP, 75014 Paris, France.
- Laboratory of Biological Nutrition, EA 4466 PRETRAM, Faculté de Pharmacie, Université Paris Descartes, 75006 Paris, France.
| | - Emmanuel Curis
- Laboratoire de biomathématiques, plateau iB², Faculté de Pharmacie, Université Paris Descartes, 75006 Paris, France.
- UMR 1144, INSERM, Université Paris Descartes, 75006 Paris, France.
- UMR 1144, Université Paris Descartes, 75006 Paris, France.
- Service de biostatistiques et d'informatique médicales, hôpital Saint-Louis, Assistance publique-hôpitaux de Paris, 75010 Paris, France.
| | - Ioannis Nicolis
- Laboratoire de biomathématiques, plateau iB², Faculté de Pharmacie, Université Paris Descartes, 75006 Paris, France.
- EA 4064 "Épidémiologie environnementale: Impact sanitaire des pollutions", Faculté de Pharmacie, Université Paris Descartes, 75006 Paris, France.
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Ahmed AA, Balogun KA, Bykova NV, Cheema SK. Novel regulatory roles of omega-3 fatty acids in metabolic pathways: a proteomics approach. Nutr Metab (Lond) 2014; 11:6. [PMID: 24438320 PMCID: PMC3898484 DOI: 10.1186/1743-7075-11-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Accepted: 01/15/2014] [Indexed: 12/28/2022] Open
Abstract
Background Omega-3 polyunsaturated fatty acids (n-3 PUFA) have been shown to alleviate the symptoms of metabolic disorders, such as heart disease, diabetes, obesity and insulin resistance. Several putative mechanisms by which n-3 PUFA elicit beneficial health effects have been proposed; however, there is still a shortage of knowledge on the proteins and pathways that are regulated by n-3 PUFA. Methods Using two dimensional polyacrylamide gel electrophoresis (2D-PAGE) and liquid chromatography-tandem mass spectrometry (LC-MS/MS) analysis, we investigated the effects of diets high or low in n-3 PUFA on hepatic proteomic profile of C57BL/6 mice. Results The findings show for the first time that high dietary n-3 PUFA reduced the expression of regucalcin, adenosine kinase and aldehyde dehydrogenase. On the other hand, diets high in n-3 PUFA increased the expression of apolipoprotein A-I, S-adenosylmethionine synthase, fructose-1, 6-bisphosphatase, ketohexokinase, malate dehydrogenase, GTP-specific succinyl CoA synthase, ornithine aminotransferase and protein disulfide isomerase-A3. Conclusions Our findings revealed for the first time that n-3 PUFA causes alterations in several novel functional proteins involved in regulating lipid, carbohydrate, one-carbon, citric acid cycle and protein metabolism, suggesting integrated regulation of metabolic pathways. These novel proteins are potential targets to develop therapeutic strategies against metabolic disorders.
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Affiliation(s)
| | | | | | - Sukhinder K Cheema
- Department of Biochemistry, Memorial University of Newfoundland, St, John's, NL, A1B 3X9, Canada.
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12
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Ladeuix B, Duchamp C, Levillain O. Underestimated contribution of skeletal muscle in ornithine metabolism during mouse postnatal development. Amino Acids 2013; 46:167-76. [DOI: 10.1007/s00726-013-1608-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Accepted: 10/19/2013] [Indexed: 02/08/2023]
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13
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Kasten J, Hu C, Bhargava R, Park H, Tai D, Byrne JA, Marescau B, De Deyn PP, Schlichting L, Grody WW, Cederbaum SD, Lipshutz GS. Lethal phenotype in conditional late-onset arginase 1 deficiency in the mouse. Mol Genet Metab 2013; 110:222-30. [PMID: 23920045 PMCID: PMC3800271 DOI: 10.1016/j.ymgme.2013.06.020] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Revised: 06/25/2013] [Accepted: 06/25/2013] [Indexed: 02/03/2023]
Abstract
Human arginase deficiency is characterized by hyperargininemia and infrequent episodes of hyperammonemia, which lead to neurological impairment with spasticity, loss of ambulation, seizures, and severe mental and growth retardation; uncommonly, patients suffer early death from this disorder. In a murine targeted knockout model, onset of the phenotypic abnormality is heralded by weight loss at around day 15, and death occurs typically by postnatal day 17 with hyperargininemia and markedly elevated ammonia. This discrepancy between the more attenuated juvenile-onset human disease and the lethal neonatal murine model has remained suboptimal for studying and developing therapy for the more common presentation of arginase deficiency. These investigations aimed to address this issue by creating an adult conditional knockout mouse to determine whether later onset of arginase deficiency also resulted in lethality. Animal survival and ammonia levels, body weight, circulating amino acids, and tissue arginase levels were examined as outcome parameters after widespread Cre-recombinase activation in a conditional knockout model of arginase 1 deficiency. One hundred percent of adult female and 70% of adult male mice died an average of 21.0 and 21.6 days, respectively, after the initiation of tamoxifen administration. Animals demonstrated elevated circulating ammonia and arginine at the onset of phenotypic abnormalities. In addition, brain and liver amino acids demonstrated abnormalities. These studies demonstrate that (a) the absence of arginase in adult animals results in a disease profile (leading to death) similar to that of the targeted knockout and (b) the phenotypic abnormalities seen in the juvenile-onset model are not exclusive to the age of the animal but instead to the biochemistry of the disorder. This adult model will be useful for developing gene- and cell-based therapies for this disorder that will not be limited by the small animal size of neonatal therapy and for developing a better understanding of the characteristics of hyperargininemia.
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Affiliation(s)
- Jennifer Kasten
- Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Chuhong Hu
- Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Ragini Bhargava
- Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Hana Park
- Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Denise Tai
- Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - James A. Byrne
- Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Bart Marescau
- Laboratory of Neurochemistry and Behavior, University of Antwerp and Institute Born Bunge, Antwerp, Belgium
| | - Peter P. De Deyn
- Laboratory of Neurochemistry and Behavior, University of Antwerp and Institute Born Bunge, Antwerp, Belgium
| | - Lisa Schlichting
- Biochemical Genetics Laboratory, University of Colorado, Denver, CO, USA
| | - Wayne W. Grody
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
- Department of Pediatrics, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
- Department of Human Genetics, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Stephen D. Cederbaum
- Department of Pediatrics, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
- Department of Human Genetics, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
- Department of Psychiatry, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
- Intellectual and Developmental Disabilities Research Center at UCLA, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Gerald S. Lipshutz
- Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
- Intellectual and Developmental Disabilities Research Center at UCLA, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
- Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
- Semel Institute for Neuroscience, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
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Moinard C, Delpierre E, Loï C, Neveux N, Butel MJ, Cynober L, Charrueau C. An oligomeric diet limits the response to injury in traumatic brain-injured rats. J Neurotrauma 2013. [PMID: 23186230 DOI: 10.1089/neu.2012.2707] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Adequate nutritional support is a major challenge in brain injury patients, because malnutrition cannot be reversed by standard enteral nutrition. We hypothesized that an oligomeric formula could improve nutritional status by restoring intestinal trophicity. Eighteen male Sprague-Dawley rats (300-330 g) underwent gastrostomy on day-7 (D-7) and traumatic brain injury (TBI) by hydraulic percussion (D0) and were then fed for 4 days with either a polymeric formula (Sondalis® HP, TBIP, n = 9), or an oligomeric formula (Peptamen® HN, TBIO, n = 9). In addition, a control group of healthy gastrostomized rats was fed the polymeric diet (control, n = 8). All rats were weighed daily. On D+4, the rats were euthanized. Blood was collected for plasma amino acid determination. Organs were removed and weighed. Intestinal morphometry was studied. Protein content was assessed on intestine and muscles. Enterobacterial translocation and dissemination were evaluated. Results were expressed as means ± SEM and compared using analysis of variance+Newman-Keuls test. TBI induced a significant decrease in whole body weight (TBIP vs. control, p < 0.05) that was totally blunted by the oligomeric diet (TBIP vs. TBIO, p < 0.01). Thymus weight significantly decreased after TBI (TBIP vs. control, p < 0.05) and was restored by the oligomeric formula (TBIO vs. TBIP, p < 0.05). Glutamine (GLN) concentration was improved by the oligomeric diet in both plasma (TBIO: 688 ± 19 vs. control: 591 ± 45 and TBIP: 615 ± 42 μmol/L, p < 0.05) and soleus muscle. These results show that the use of an oligomeric diet may limit response to injury after brain injury and could be a simple nutritional strategy in this setting.
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Affiliation(s)
- Christophe Moinard
- Laboratoire de Biologie de la Nutrition, EA 4466, Université Paris Descartes , Faculté des Sciences Pharmaceutiques et Biologiques, Sorbonne Paris Cité, Paris, France
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15
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Synthesis and characterization of a stimulus-responsive l-ornithine-degrading hydrogel. J Control Release 2013; 165:38-43. [DOI: 10.1016/j.jconrel.2012.10.022] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Revised: 10/22/2012] [Accepted: 10/28/2012] [Indexed: 01/24/2023]
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16
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da Silva R, Levillain O, Brosnan JT, Araneda S, Brosnan ME. The effect of portacaval anastomosis on the expression of glutamine synthetase and ornithine aminotransferase in perivenous hepatocytes. Can J Physiol Pharmacol 2012; 91:362-8. [PMID: 23656379 DOI: 10.1139/cjpp-2012-0060] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
There is functional zonation of metabolism across the liver acinus, with glutamine synthetase restricted to a narrow band of cells around the terminal hepatic venules. Portacaval anastomosis, where there is a major rerouting of portal blood flow from the portal vein directly to the vena cava bypassing the liver, has been reported to result in a marked decrease in the activity of glutamine synthetase. It is not known whether this represents a loss of perivenous hepatocytes or whether there is a specific loss of glutamine synthetase. To answer this question, we have determined the activity of glutamine synthetase and another enzyme from the perivenous compartment, ornithine aminotransferase, as well as the immunochemical localization of both glutamine synthetase and ornithine aminotransferase in rats with a portacaval shunt. The portacaval shunt caused a marked decrease in glutamine synthetase activity and an increase in ornithine aminotransferase activity. Immunohistochemical analysis showed that the glutamine synthetase and ornithine aminotransferase proteins maintained their location in the perivenous cells. These results indicate that there is no generalized loss of perivenous hepatocytes, but rather, there is a significant alteration in the expression of these proteins and hence metabolism in this cell population.
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Affiliation(s)
- Robin da Silva
- Memorial University of Newfoundland, Department of Biochemistry, St. John's, NL A1B 3X9, Canada
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Marini JC, Stoll B, Didelija IC, Burrin DG. De novo synthesis is the main source of ornithine for citrulline production in neonatal pigs. Am J Physiol Endocrinol Metab 2012; 303:E1348-53. [PMID: 23074237 PMCID: PMC3774079 DOI: 10.1152/ajpendo.00399.2012] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Citrulline is an amino acid synthesized in the gut and utilized for the synthesis of the conditionally essential amino acid arginine. Recently, the origin of the ornithine utilized for citrulline synthesis has become a matter of discussion. Multiple physiological factors may have contributed to the differences found among different researchers; one of these is the developmental stage of the subjects studied. To test the hypothesis that during the neonatal period de novo synthesis is the main source of ornithine for citrulline synthesis, neonatal piglets were infused intravenously or intragastrically with [U-(13)C(6)]arginine, [U-(13)C(5)]glutamine, or [U-(13)C(5)]proline during the fasted and fed periods. [ureido-(15)N]citrulline and [(2)H(2)]ornithine were infused intravenously for the entire infusion protocol. During fasting, plasma proline (13%) and ornithine (19%) were the main precursors for citrulline synthesis, whereas plasma arginine (62%) was the main precursor for plasma ornithine. During feeding, enteral (27%) and plasma (12%) proline were the main precursors for the ornithine utilized in the synthesis of citrulline, together with plasma ornithine (27%). Enteral proline and glutamine were utilized directly by the gut to produce ornithine utilized for citrulline synthesis. Arginine was not utilized by the gut, which is consistent with the lack of arginase activity in the neonate. Arginine, however, was the main source (47%) of plasma ornithine and in this way contributed to citrulline synthesis. In conclusion, during the neonatal period, the de novo pathway is the predominant source for the ornithine utilized in the synthesis of citrulline, and proline is the preferred precursor.
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Affiliation(s)
- Juan C Marini
- United States Department of Agriculture/Agricultural Research Service Children’s Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA.
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Marini JC. Arginine and ornithine are the main precursors for citrulline synthesis in mice. J Nutr 2012; 142:572-80. [PMID: 22323761 PMCID: PMC3278269 DOI: 10.3945/jn.111.153825] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Recent isotopic tracer studies in mice, piglets, and humans have produced conflicting results as to the main carbon skeleton precursor for citrulline and arginine synthesis. This may be due in part to the different tracers infused and models used to interpret the stable isotope data. Furthermore, previous studies usually investigated a single precursor, which prevented the direct comparison among multiple precursors. To further elucidate the contribution of different precursors to citrulline synthesis, all possible enteral and plasma precursors of citrulline were studied in a mouse model during the postabsorptive and postprandial period using multitracer protocols. In addition, three different models were used to interpret the stable isotope data. The utilization of the classic precursor-product equation, developed for i.v. infused tracers but also used to include i.g. tracers, grossly overestimated the contribution of enteral precursors. Regardless of the model employed, dietary and plasma arginine were the main precursors for citrulline synthesis during feeding and plasma arginine during feed deprivation. The contribution of arginine was directly at the site of citrulline synthesis and through plasma ornithine. The predominant role of arginine and ornithine seen in this study supports the observations in mice, piglets, and humans suggesting that ornithine amino transferase is a pivotal enzyme in this pathway.
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Wang J, Wang YY, Lin L, Gao Y, Hong HS, Wang DZ. Quantitative proteomic analysis of okadaic acid treated mouse small intestines reveals differentially expressed proteins involved in diarrhetic shellfish poisoning. J Proteomics 2012; 75:2038-52. [PMID: 22270013 DOI: 10.1016/j.jprot.2012.01.010] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2011] [Revised: 12/29/2011] [Accepted: 01/06/2012] [Indexed: 12/29/2022]
Abstract
Okadaic acid (OA) is a principal diarrhetic shellfish poisoning toxin produced by marine dinoflagellates. This study compared protein profiles of mice small intestines at four time points (0, 3, 6 and 24 h) after a single oral administration of 750 μg/kg OA, and identified the differentially expressed proteins using 2-D DIGE and MALDI-TOF-TOF mass spectrometry. The results showed that the toxin content of the intestines reached its peak 3h after oral administration and then decreased rapidly. OA remarkably inhibited the intestinal PP activity but it recovered to the normal levels within 6 to 24 h. Electron microscope revealed the collapse of the villous architecture and the intestinal microvilli fell off at 3 h, but were repaired within 24h. Notable damage to the intestinal ultrastructure was observed after oral administration. Comparison of the small intestine protein profiles at four time points revealed that 58 proteins were remarkably altered in abundance, and these proteins were involved in macromolecular metabolism, cytoskeleton reorganization, signal transduction, molecular chaperoning and oxidative stress, suggesting that OA toxicity in mouse intestines was complex and diverse, and that multiple proteins other than PP were involved in the diarrhetic process. Villin 1 and hnRNP F might be the key triggers inducing diarrhea in the mouse small intestines.
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Affiliation(s)
- Juan Wang
- State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China
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20
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Evidence for a role of the ileum in the control of nitrogen homeostasis via the regulation of arginine metabolism. Br J Nutr 2011; 106:227-36. [DOI: 10.1017/s0007114511000079] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
As arginine plays a key role in the regulation of liver ureagenesis, we hypothesised that a modulation of enzymes involved in arginine metabolism within the intestine contributes to the regulation of N homeostasis according to protein supply. Our aim was to study the influence of variations in protein or amino acid (AA) supply on intestinal arginase, glutaminase, ornithine aminotransferase (OAT), argininosuccinate lyase and argininosuccinate synthetase. We evaluated in vivo in rats the responses of these enzymes to short-term (ST, 16 h) and long-term (LT, 15 d) variations in dietary protein (10, 17 or 25 % protein diet). In addition, in order to test whether these responses could involve a direct action of AA on the gene expression and activity of these enzymes, Caco-2/TC7 cells were cultured for 3 d with increasing AA concentrations. In vivo, in the ST, both high- and low-protein diets increased arginase activity in the intestinal mucosa (ST25 %: 46 (sem 2) μmol/g per min and ST10 %: 46 (sem 2) μmol/g per min v. ST17 %: 36 (sem 3) μmol/g per min, P < 0·05). In the LT, OAT expression was increased in the LT10 % group (+277 %, P < 0·05) compared with the LT17 % group. Caco-2/TC7 cells showed inverse relationships between AA supply and arginase (P = 0·058) and OAT (P = 0·035) expressions. The present study demonstrates the regulation of intestinal arginase and OAT expressions in response to protein supply. Our in vitro experiments further indicate a direct AA-induced regulation of the mRNA abundance of these enzymes. In situations of limited protein supply, this regulation would increase intestinal arginine catabolism and, possibly via a decrease in arginine portal release, decrease hepatic AA oxidation, thus promoting N sparing.
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Living with high putrescine: expression of ornithine and arginine biosynthetic pathway genes in high and low putrescine producing poplar cells. Amino Acids 2010; 42:295-308. [PMID: 21082203 DOI: 10.1007/s00726-010-0807-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2010] [Accepted: 11/01/2010] [Indexed: 10/18/2022]
Abstract
Arginine (Arg) and ornithine (Orn), both derived from glutamate (Glu), are the primary substrates for polyamine (PA) biosynthesis, and also play important roles as substrates and intermediates of overall N metabolism in plants. Their cellular homeostasis is subject to multiple levels of regulation. Using reverse transcription quantitative PCR (RT-qPCR), we studied changes in the expression of all genes of the Orn/Arg biosynthetic pathway in response to up-regulation [via transgenic expression of mouse Orn decarboxylase (mODC)] of PA biosynthesis in poplar (Populus nigra × maximowiczii) cells grown in culture. Cloning and sequencing of poplar genes involved in the Orn/Arg biosynthetic pathway showed that they have high homology with similar genes in other plants. The expression of the genes of Orn, Arg and PA biosynthetic pathway fell into two hierarchical clusters; expression of one did not change in response to high putrescine, while members of the other cluster showed a shift in expression pattern during the 7-day culture cycle. Gene expression of branch point enzymes (N-acetyl-Glu synthase, Orn aminotransferase, Arg decarboxylase, and spermidine synthase) in the sub-pathways, constituted a separate cluster from those involved in intermediary reactions of the pathway (N-acetyl-Glu kinase, N-acetyl-Glu-5-P reductase, N-acetyl-Orn aminotransferase, N (2)-acetylOrn:N-acetyl-Glu acetyltransferase, N (2)-acetyl-Orn deacetylase, Orn transcarbamylase, argininosuccinate synthase, carbamoylphosphate synthetase, argininosuccinate lyase, S-adenosylmethionine decarboxylase, spermine synthase). We postulate that expression of all genes of the Glu-Orn-Arg pathway is constitutively coordinated and is not influenced by the increase in flux rate through this pathway in response to increased utilization of Orn by mODC; thus the pathway involves mostly biochemical regulation rather than changes in gene expression. We further suggest that Orn itself plays a major role in the regulation of this pathway.
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Mieulet V, Yan L, Choisy C, Sully K, Procter J, Kouroumalis A, Krywawych S, Pende M, Ley SC, Moinard C, Lamb RF. TPL-2-mediated activation of MAPK downstream of TLR4 signaling is coupled to arginine availability. Sci Signal 2010; 3:ra61. [PMID: 20716763 DOI: 10.1126/scisignal.2000934] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The innate immune response is influenced by the nutrient status of the host. Mitogen-activated protein kinases (MAPKs), such as extracellular signal-regulated kinase 1 (ERK1) and ERK2, are activated after the stimulation of macrophages with bacterial lipopolysaccharide (LPS) and are necessary for the optimal production of proinflammatory cytokines such as tumor necrosis factor-alpha (TNF-alpha). We uncovered a role for the extracellular nutrient arginine in the activation of ERK1/2 in LPS-stimulated macrophages. Arginine facilitated the activation of MAPKs by preventing the dephosphorylation and inactivation of the MAPK kinase kinase tumor-promoting locus 2 (TPL-2). Starvation of mice decreased the concentration of arginine in the plasma and impaired the activation of ERK1/2 by LPS. Supplementation of starved mice with arginine promoted the subsequent activation of ERK1/2 and the production of TNF-alpha in response to LPS. Thus, arginine is critical for two aspects of the innate immune response in macrophages: It is the precursor used in the generation of the antimicrobial mediator nitric oxide, and it facilitates MAPK activation and consequently cytokine production.
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Affiliation(s)
- Virginie Mieulet
- Department of Oncology, University of Alberta, Cross Cancer Institute, Edmonton, Alberta, Canada
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Stránská J, Tylichová M, Kopecný D, Snégaroff J, Sebela M. Biochemical characterization of pea ornithine-delta-aminotransferase: substrate specificity and inhibition by di- and polyamines. Biochimie 2010; 92:940-8. [PMID: 20381578 DOI: 10.1016/j.biochi.2010.03.026] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2010] [Accepted: 03/30/2010] [Indexed: 11/20/2022]
Abstract
Ornithine-delta-aminotransferase (OAT, EC 2.6.1.13) catalyzes the transamination of L-ornithine to L-glutamate-gamma-semialdehyde. The physiological role of OAT in plants is not yet well understood. It is probably related to arginine catabolism resulting in glutamate but the enzyme has also been associated with stress-induced proline biosynthesis. We investigated the enzyme from pea (PsOAT) to assess whether diamines and polyamines may serve as substrates or they show inhibitory properties. First, a cDNA coding for PsOAT was cloned and expressed in Escherichia coli to obtain a recombinant protein with a C-terminal 6xHis tag. Recombinant PsOAT was purified under native conditions by immobilized metal affinity chromatography and its molecular and kinetic properties were characterized. Protein identity was confirmed by peptide mass fingerprinting after proteolytic digestion. The purified PsOAT existed as a monomer of 50 kDa and showed typical spectral properties of enzymes containing pyridoxal-5'-phosphate as a prosthetic group. The cofactor content of PsOAT was estimated to be 0.9 mol per mol of the monomer by a spectrophotometric analysis with phenylhydrazine. L-Ornithine was the best substrate (K(m)=15 mM) but PsOAT also slowly converted N(alpha)-acetyl-L-ornithine. In these reactions, 2-oxoglutarate was the exclusive amino group acceptor (K(m)=2mM). The enzyme had a basic optimal pH of 8.8 and displayed relatively high temperature optimum. Diamines and polyamines were not accepted as substrates. On the other hand, putrescine, spermidine and others represented weak non-competitive inhibitors. A model of the molecular structure of PsOAT was obtained using the crystal structure of human OAT as a template.
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Affiliation(s)
- Jana Stránská
- Department of Biochemistry, Faculty of Science, Palacký University, Olomouc, Czech Republic
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Ventura G, Moinard C, Segaud F, Le Plenier S, Cynober L, De Bandt JP. Adaptative response of nitrogen metabolism in early endotoxemia: role of ornithine aminotransferase. Amino Acids 2010; 39:1417-26. [DOI: 10.1007/s00726-010-0601-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2009] [Accepted: 04/16/2010] [Indexed: 10/19/2022]
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Cho SO, Lim JW, Jun JH, Kim KH, Kim H. Helicobacter pylori in a Korean isolate expressed proteins differentially in human gastric epithelial cells. Dig Dis Sci 2010; 55:1550-64. [PMID: 19672714 DOI: 10.1007/s10620-009-0908-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2009] [Accepted: 07/05/2009] [Indexed: 12/19/2022]
Abstract
PURPOSE The proteins expressed in gastric epithelial cells infected with Helicobacter pylori (H. pylori) may determine the clinical outcome such as chronic gastritis, peptic ulcer, and gastric carcinoma. The present study aims to determine the differentially expressed proteins in human gastric epithelial AGS cells that were infected with H. pylori in a Korean isolate, a cagA+, vacA s1b m2 iceA1 H. pylori by proteomic analysis. The differentially expressed proteins, whose expression levels were more or less than twofold in H. pylori-infected cells, were analyzed. RESULTS Ten proteins (chromatin assembly factor-1, proliferating cell nuclear antigen, 14-3-3 protein tau, eukaryotic translation initiation factor 6, heat-shock protein 90beta, dimethylarginine dimethylaminohydrolase-1, L-lactate dehydrogenase B chain, prohibitin, triosephosphate isomerase, protein disulfide isomerase) were up-regulated while eight proteins (heat-shock gp96 precursor, nucleophosmin, ornithine aminotransferase, Ku70, L-arginine-glycine amidinotransferase, Smad anchor for receptor activation, ADP-ribosylation factor, WD repeat-containing protein isoform 1) were down-regulated by H. pylori infection in AGS cells. These proteins are related to cell proliferation, cell adhesion, carcinogenesis, cell-defense mechanisms against oxidative stress, membrane trafficking, and energy metabolism. CONCLUSIONS Oxidative stress, cell proliferation, cell adhesion, and membrane trafficking may be involved in the pathogenesis of gastric diseases including cancer associated with H. pylori in a Korean isolate.
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Affiliation(s)
- Soon Ok Cho
- Department of Pharmacology, Brain Korea 21 Project for Medical Sciences, Yonsei University College of Medicine, Seoul, Korea
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Short-term correction of arginase deficiency in a neonatal murine model with a helper-dependent adenoviral vector. Mol Ther 2009; 17:1155-63. [PMID: 19367256 DOI: 10.1038/mt.2009.65] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Neonatal gene therapy has the potential to ameliorate abnormalities before disease onset. Our gene knockout of arginase I (AI) deficiency is characterized by increasing hyperammonemia, neurological deterioration, and early death. We constructed a helper-dependent adenoviral vector (HDV) carrying AI and examined for correction of this defect. Neonates were administered 5 x 10(9) viral particles/g and analyzed for survival, arginase activity, and ammonia and amino acids levels. The life expectancy of arg(-/-) mice increased to 27 days while controls died at 14 days with hyperammonemia and in extremis. Death correlated with a decrease in viral DNA/RNA per cell as liver mass increased. Arginase assays demonstrated that vector-injected hepatocytes had ~20% activity of heterozygotes at 2 weeks of age. Hepatic arginine and ornithine in treated mice were similar to those of saline-injected heterozygotes at 2 weeks, whereas ammonia was normal. By 26 days, arginase activity in the treated arg(-/-) livers declined to <10%, and arginine and ornithine increased. Ammonia levels began increasing by day 25, suggesting the cause of death to be similar to that of uninjected arg(-/-) mice, albeit at a later time. These studies demonstrate that the AI deficient newborn mouse can be temporarily corrected and rescued using a HDV.
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