1
|
Kelly KA, Heaps CL, Wu G, Labhasetwar V, Meininger CJ. Nanoparticle-mediated delivery of tetrahydrobiopterin restores endothelial function in diabetic rats. Nitric Oxide 2024; 148:13-22. [PMID: 38642795 DOI: 10.1016/j.niox.2024.04.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 04/11/2024] [Accepted: 04/16/2024] [Indexed: 04/22/2024]
Abstract
Endothelial dysfunction, underlying the vascular complications of diabetes and other cardiovascular disorders, may result from uncoupling of endothelial nitric oxide synthase (eNOS) activity due to decreased levels of tetrahydrobiopterin (BH4), a critical co-factor for eNOS. Some clinical trials attempting to deliver exogenous BH4 as a potential therapeutic strategy in vascular disease states have failed due to oxidation of BH4 in the circulation. We sought to develop a means of protecting BH4 from oxidation while delivering it to dysfunctional endothelial cells. Polymeric and solid lipid nanoparticles (NPs) loaded with BH4 were delivered by injection or oral gavage, respectively, to streptozotocin-induced diabetic rats. BH4 was measured in coronary endothelial cells and endothelium-dependent vascular reactivity was assessed in vascular rings. Lymphatic uptake of orally delivered lipid NPs was verified by sampling mesenteric lymph. BH4-loaded polymeric NPs maintained nitric oxide production by cultured endothelial cells under conditions of oxidative stress. BH4-loaded NPs, delivered via injection or ingestion, increased coronary endothelial BH4 concentration and improved endothelium-dependent vasorelaxation in diabetic rats. Pharmacodynamics assessment indicated peak concentration of solid lipid NPs in the systemic bloodstream 6 hours after ingestion, with disappearance noted by 48 hours. These studies support the feasibility of utilizing NPs to deliver BH4 to dysfunctional endothelial cells to increase nitric oxide bioavailability. BH4-loaded NPs could provide an innovative tool to restore redox balance in blood vessels and modulate eNOS-mediated vascular function to reverse or retard vascular disease in diabetes.
Collapse
Affiliation(s)
- Katherine A Kelly
- Texas A&M University College of Medicine, Department of Medical Physiology, 8447 Riverside Parkway, Medical Research and Education Building Rm 1341, Bryan, TX, 77807, USA
| | - Cristine L Heaps
- Texas A&M University School of Veterinary Medicine & Biomedical Sciences, Department of Veterinary Physiology & Pharmacology, 4466 TAMU, College Station, TX, 77843-4466, USA
| | - Guoyao Wu
- Texas A&M University College of Medicine, Department of Medical Physiology, 8447 Riverside Parkway, Medical Research and Education Building Rm 1341, Bryan, TX, 77807, USA; Texas A&M University, Department of Animal Science, Kleberg Center Rm 133, 2471 TAMU, College Station, TX, 77843-2471, USA
| | - Vinod Labhasetwar
- Lerner Research Institute, Department of Biomedical Engineering, 9500 Euclid Avenue, Mail Code ND20, Cleveland, OH, 44196, USA
| | - Cynthia J Meininger
- Texas A&M University College of Medicine, Department of Medical Physiology, 8447 Riverside Parkway, Medical Research and Education Building Rm 1341, Bryan, TX, 77807, USA.
| |
Collapse
|
2
|
Feng Y, Feng Y, Gu L, Mo W, Wang X, Song B, Hong M, Geng F, Huang P, Yang H, Zhu W, Jiao Y, Zhang Q, Ding WQ, Cao J, Zhang S. Tetrahydrobiopterin metabolism attenuates ROS generation and radiosensitivity through LDHA S-nitrosylation: novel insight into radiogenic lung injury. Exp Mol Med 2024:10.1038/s12276-024-01208-z. [PMID: 38689083 DOI: 10.1038/s12276-024-01208-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Revised: 02/06/2024] [Accepted: 02/07/2024] [Indexed: 05/02/2024] Open
Abstract
Genotoxic therapy triggers reactive oxygen species (ROS) production and oxidative tissue injury. S-nitrosylation is a selective and reversible posttranslational modification of protein thiols by nitric oxide (NO), and 5,6,7,8-tetrahydrobiopterin (BH4) is an essential cofactor for NO synthesis. However, the mechanism by which BH4 affects protein S-nitrosylation and ROS generation has not been determined. Here, we showed that ionizing radiation disrupted the structural integrity of BH4 and downregulated GTP cyclohydrolase I (GCH1), which is the rate-limiting enzyme in BH4 biosynthesis, resulting in deficiency in overall protein S-nitrosylation. GCH1-mediated BH4 synthesis significantly reduced radiation-induced ROS production and fueled the global protein S-nitrosylation that was disrupted by radiation. Likewise, GCH1 overexpression or the administration of exogenous BH4 protected against radiation-induced oxidative injury in vitro and in vivo. Conditional pulmonary Gch1 knockout in mice (Gch1fl/fl; Sftpa1-Cre+/- mice) aggravated lung injury following irradiation, whereas Gch1 knock-in mice (Gch1lsl/lsl; Sftpa1-Cre+/- mice) exhibited attenuated radiation-induced pulmonary toxicity. Mechanistically, lactate dehydrogenase (LDHA) mediated ROS generation downstream of the BH4/NO axis, as determined by iodoacetyl tandem mass tag (iodoTMT)-based protein quantification. Notably, S-nitrosylation of LDHA at Cys163 and Cys293 was regulated by BH4 availability and could restrict ROS generation. The loss of S-nitrosylation in LDHA after irradiation increased radiosensitivity. Overall, the results of the present study showed that GCH1-mediated BH4 biosynthesis played a key role in the ROS cascade and radiosensitivity through LDHA S-nitrosylation, identifying novel therapeutic strategies for the treatment of radiation-induced lung injury.
Collapse
Affiliation(s)
- Yang Feng
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Medical College of Soochow University, 215123, Suzhou, China
- Department of Oncology, Wuxi No.2 People's Hospital, Jiangnan University Medical Center, 214002, Wuxi, China
| | - Yahui Feng
- Laboratory of Radiation Medicine, Second Affiliated Hospital of Chengdu Medical College, China National Nuclear Corporation 416 Hospital, 610051, Chengdu, China
| | - Liming Gu
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Medical College of Soochow University, 215123, Suzhou, China
| | - Wei Mo
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Medical College of Soochow University, 215123, Suzhou, China
| | - Xi Wang
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Medical College of Soochow University, 215123, Suzhou, China
| | - Bin Song
- West China Second University Hospital, Sichuan University, 610041, Chengdu, China
| | - Min Hong
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Medical College of Soochow University, 215123, Suzhou, China
| | - Fenghao Geng
- West China Second University Hospital, Sichuan University, 610041, Chengdu, China
| | - Pei Huang
- Department of Oncology, Wuxi No.2 People's Hospital, Jiangnan University Medical Center, 214002, Wuxi, China
| | - Hongying Yang
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Medical College of Soochow University, 215123, Suzhou, China
| | - Wei Zhu
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Medical College of Soochow University, 215123, Suzhou, China
| | - Yang Jiao
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Medical College of Soochow University, 215123, Suzhou, China
| | - Qi Zhang
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Medical College of Soochow University, 215123, Suzhou, China
| | - Wei-Qun Ding
- Department of Pathology, Stephenson Cancer Centre, College of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK, 73104, USA
| | - Jianping Cao
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Medical College of Soochow University, 215123, Suzhou, China.
| | - Shuyu Zhang
- Laboratory of Radiation Medicine, Second Affiliated Hospital of Chengdu Medical College, China National Nuclear Corporation 416 Hospital, 610051, Chengdu, China.
- West China Second University Hospital, Sichuan University, 610041, Chengdu, China.
- Laboratory of Radiation Medicine, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, 610041, Chengdu, China.
- NHC Key Laboratory of Nuclear Technology Medical Transformation (Mianyang Central Hospital), 621099, Mianyang, China.
| |
Collapse
|
3
|
Bookey N, Drago P, Leung KY, Hughes L, MacCooey A, Ozaki M, Henry M, De Castro SCP, Doykov I, Heywood WE, Mills K, Murphy MM, Cavallé-Busquets P, Campbell S, Burtenshaw D, Meleady P, Cahill PA, Greene NDE, Parle-McDermott A. The Differential Translation Capabilities of the Human DHFR2 Gene Indicates a Developmental and Tissue-Specific Endogenous Protein of Low Abundance. Mol Cell Proteomics 2024; 23:100718. [PMID: 38224738 PMCID: PMC10884974 DOI: 10.1016/j.mcpro.2024.100718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 01/05/2024] [Accepted: 01/12/2024] [Indexed: 01/17/2024] Open
Abstract
A functional role has been ascribed to the human dihydrofolate reductase 2 (DHFR2) gene based on the enzymatic activity of recombinant versions of the predicted translated protein. However, the in vivo function is still unclear. The high amino acid sequence identity (92%) between DHFR2 and its parental homolog, DHFR, makes analysis of the endogenous protein challenging. This paper describes a targeted mass spectrometry proteomics approach in several human cell lines and tissue types to identify DHFR2-specific peptides as evidence of its translation. We show definitive evidence that the DHFR2 activity in the mitochondria is in fact mediated by DHFR, and not DHFR2. Analysis of Ribo-seq data and an experimental assessment of ribosome association using a sucrose cushion showed that the two main Ensembl annotated mRNA isoforms of DHFR2, 201 and 202, are differentially associated with the ribosome. This indicates a functional role at both the RNA and protein level. However, we were unable to detect DHFR2 protein at a detectable level in most cell types examined despite various RNA isoforms of DHFR2 being relatively abundant. We did detect a DHFR2-specific peptide in embryonic heart, indicating that the protein may have a specific role during embryogenesis. We propose that the main functionality of the DHFR2 gene in adult cells is likely to arise at the RNA level.
Collapse
Affiliation(s)
- Niamh Bookey
- School of Biotechnology, Dublin City University, Dublin, Ireland; DCU Life Sciences Institute, Dublin City University, Dublin, Ireland.
| | - Paola Drago
- School of Biotechnology, Dublin City University, Dublin, Ireland; DCU Life Sciences Institute, Dublin City University, Dublin, Ireland
| | - Kit-Yi Leung
- Developmental Biology and Cancer Department, UCL Great Ormond Street Institute of Child Health, University College London, London, UK
| | - Linda Hughes
- School of Biotechnology, Dublin City University, Dublin, Ireland
| | - Aoife MacCooey
- School of Biotechnology, Dublin City University, Dublin, Ireland
| | - Mari Ozaki
- School of Biotechnology, Dublin City University, Dublin, Ireland
| | - Michael Henry
- DCU Life Sciences Institute, Dublin City University, Dublin, Ireland
| | - Sandra C P De Castro
- Developmental Biology and Cancer Department, UCL Great Ormond Street Institute of Child Health, University College London, London, UK
| | - Ivan Doykov
- Translational Mass Spectrometry Research Group, UCL Great Ormond Street Institute of Child Health, University College London, London, UK
| | - Wendy E Heywood
- Translational Mass Spectrometry Research Group, UCL Great Ormond Street Institute of Child Health, University College London, London, UK
| | - Kevin Mills
- Translational Mass Spectrometry Research Group, UCL Great Ormond Street Institute of Child Health, University College London, London, UK
| | - Michelle M Murphy
- Area of Preventive Medicine and Public Health, Department of Basic Medical Sciences, Faculty of Medicine and Health Sciences, Universitat Rovira i Virgili, IISPV and CIBERobn (Instituto de Salud Carlos III), Reus, Spain
| | - Pere Cavallé-Busquets
- Area of Obstetrics, Hospital Universitari Sant Joan de Reus, IISPV and CIBERobn (Instituto de Salud Carlos III), Reus, Spain
| | - Susan Campbell
- Sheffield Hallam University, Department of Biosciences and Chemistry, Sheffield, UK
| | | | - Paula Meleady
- School of Biotechnology, Dublin City University, Dublin, Ireland; DCU Life Sciences Institute, Dublin City University, Dublin, Ireland
| | - Paul A Cahill
- School of Biotechnology, Dublin City University, Dublin, Ireland
| | - Nicholas D E Greene
- Developmental Biology and Cancer Department, UCL Great Ormond Street Institute of Child Health, University College London, London, UK
| | - Anne Parle-McDermott
- School of Biotechnology, Dublin City University, Dublin, Ireland; DCU Life Sciences Institute, Dublin City University, Dublin, Ireland.
| |
Collapse
|
4
|
Yuan W, Sun Z, Ji G, Hu H. Emerging roles of ferroptosis in male reproductive diseases. Cell Death Discov 2023; 9:358. [PMID: 37770442 PMCID: PMC10539319 DOI: 10.1038/s41420-023-01665-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 09/11/2023] [Accepted: 09/22/2023] [Indexed: 09/30/2023] Open
Abstract
Ferroptosis is a type of programmed cell death mediated by iron-dependent lipid peroxidation that leads to excessive lipid peroxidation in different cells. Ferroptosis is distinct from other forms of cell death and is associated with various diseases. Iron is essential for spermatogenesis and male reproductive function. Therefore, it is not surprising that new evidence supports the role of ferroptosis in testicular injury. Although the molecular mechanism by which ferroptosis induces disease is unknown, several genes and pathways associated with ferroptosis have been linked to testicular dysfunction. In this review, we discuss iron metabolism, ferroptosis, and related regulatory pathways. In addition, we analyze the endogenous and exogenous factors of ferroptosis in terms of iron metabolism and testicular dysfunction, as well as summarize the relationship between ferroptosis and male reproductive dysfunction. Finally, we discuss potential strategies to target ferroptosis for treating male reproductive diseases and provide new directions for preventing male reproductive diseases.
Collapse
Affiliation(s)
- Wenzheng Yuan
- Key Laboratory of Fertility Preservation, School of Life Sciences and Technologies, Sanquan College of Xinxiang Medical University, Xinxiang, 453003, Henan Province, PR China
- Institute of Life Sciences, China Medical University, Shenyang, 110122, Liaoning Province, PR China
| | - Zhibin Sun
- Key Laboratory of Fertility Preservation, School of Life Sciences and Technologies, Sanquan College of Xinxiang Medical University, Xinxiang, 453003, Henan Province, PR China
| | - Guojie Ji
- Key Laboratory of Fertility Preservation, School of Life Sciences and Technologies, Sanquan College of Xinxiang Medical University, Xinxiang, 453003, Henan Province, PR China.
| | - Huanhuan Hu
- Key Laboratory of Fertility Preservation, School of Life Sciences and Technologies, Sanquan College of Xinxiang Medical University, Xinxiang, 453003, Henan Province, PR China.
| |
Collapse
|
5
|
Measurement of Tetrahydrobiopterin in Animal Tissue Samples by HPLC with Electrochemical Detection-Protocol Optimization and Pitfalls. Antioxidants (Basel) 2022; 11:antiox11061182. [PMID: 35740082 PMCID: PMC9228106 DOI: 10.3390/antiox11061182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Revised: 06/10/2022] [Accepted: 06/14/2022] [Indexed: 11/17/2022] Open
Abstract
Tetrahydrobiopterin (BH4) is an essential cofactor of all nitric oxide synthase isoforms, thus determination of BH4 levels can provide important mechanistic insight into diseases. We established a protocol for high-performance liquid chromatography/electrochemical detection (HPLC/ECD)-based determination of BH4 in tissue samples. We first determined the optimal storage and work-up conditions for authentic BH4 and its oxidation product dihydrobiopterin (BH2) under various conditions (pH, temperature, presence of antioxidants, metal chelators, and storage time). We then applied optimized protocols for detection of BH4 in tissues of septic (induced by lipopolysaccharide [LPS]) rats. BH4 standards in HCl are stabilized by addition of 1,4-dithioerythritol (DTE) and diethylenetriaminepentaacetic acid (DTPA), while HCl was sufficient for BH2 standard stabilization. Overnight storage of BH4 standard solutions at room temperature in HCl without antioxidants caused complete loss of BH4 and the formation of BH2. We further optimized the protocol to separate ascorbate and the BH4 tissue sample and found a significant increase in BH4 in the heart and kidney as well as higher BH4 levels by trend in the brain of septic rats compared to control rats. These findings correspond to reports on augmented nitric oxide and BH4 levels in both animals and patients with septic shock.
Collapse
|
6
|
Premjit Y, Pandey S, Mitra J. Recent Trends in Folic Acid (Vitamin B9) Encapsulation, Controlled Release, and Mathematical Modelling. FOOD REVIEWS INTERNATIONAL 2022. [DOI: 10.1080/87559129.2022.2077361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- Yashaswini Premjit
- Agricultural and Food Engineering Department, Indian Institute of Technology Kharagpur, Kharagpur, India
| | - Sachchidanand Pandey
- Agricultural and Food Engineering Department, Indian Institute of Technology Kharagpur, Kharagpur, India
| | - Jayeeta Mitra
- Agricultural and Food Engineering Department, Indian Institute of Technology Kharagpur, Kharagpur, India
| |
Collapse
|
7
|
Miyajima K, Sudo Y, Sanechika S, Hara Y, Horiguchi M, Xu F, Suzuki M, Hara S, Tanda K, Inoue KI, Takada M, Yoshioka N, Takebayashi H, Mori-Kojima M, Sugimoto M, Sumi-Ichinose C, Kondo K, Takao K, Miyakawa T, Ichinose H. Perturbation of monoamine metabolism and enhanced fear responses in mice defective in the regeneration of tetrahydrobiopterin. J Neurochem 2022; 161:129-145. [PMID: 35233765 DOI: 10.1111/jnc.15600] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 02/11/2022] [Accepted: 02/23/2022] [Indexed: 11/28/2022]
Abstract
Increasing evidence suggests the involvement of peripheral amino acid metabolism in the pathophysiology of neuropsychiatric disorders, whereas the molecular mechanisms are largely unknown. Tetrahydrobiopterin (BH4) is a cofactor for enzymes that catalyze phenylalanine metabolism, monoamine synthesis, nitric oxide production, and lipid metabolism. BH4 is synthesized from guanosine triphosphate and regenerated by quinonoid dihydropteridine reductase (QDPR), which catalyzes the reduction of quinonoid dihydrobiopterin. We analyzed Qdpr-/- mice to elucidate the physiological significance of the regeneration of BH4. We found that the Qdpr-/- mice exhibited mild hyperphenylalaninemia and monoamine deficiency in the brain, despite the presence of substantial amounts of BH4 in the liver and brain. Hyperphenylalaninemia was ameliorated by exogenously administered BH4, and dietary phenylalanine restriction was effective for restoring the decreased monoamine contents in the brain of the Qdpr-/- mice, suggesting that monoamine deficiency was caused by the secondary effect of hyperphenylalaninemia. Immunohistochemical analysis showed that QDPR was primarily distributed in oligodendrocytes but hardly detectable in monoaminergic neurons in the brain. Finally, we performed a behavioral assessment using a test battery. The Qdpr-/- mice exhibited enhanced fear responses after electrical foot shock. Taken together, our data suggest that the perturbation of BH4 metabolism should affect brain monoamine levels through alterations in peripheral amino acid metabolism, and might contribute to the development of anxiety-related psychiatric disorders. Cover Image for this issue: https://doi.org/10.1111/jnc.15398.
Collapse
Affiliation(s)
- Katsuya Miyajima
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Japan
| | - Yusuke Sudo
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Japan
| | - Sho Sanechika
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Japan
| | - Yoshitaka Hara
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Japan
| | - Mieko Horiguchi
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Japan
- Department of Domestic Science, Otsuma Women's University Junior College Division, Tokyo, Japan
| | - Feng Xu
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Japan
| | - Minori Suzuki
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Japan
| | - Satoshi Hara
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Japan
| | - Koichi Tanda
- Genetic Engineering and Functional Genomics Group, Frontier Technology Center, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Ken-Ichi Inoue
- Systems Neuroscience Section, Primate Research Institute, Kyoto University, Inuyama, Aichi, Japan
| | - Masahiko Takada
- Systems Neuroscience Section, Primate Research Institute, Kyoto University, Inuyama, Aichi, Japan
| | - Nozomu Yoshioka
- Division of Neurobiology and Anatomy, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Hirohide Takebayashi
- Division of Neurobiology and Anatomy, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Masayo Mori-Kojima
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Japan
- Institute for Advanced Biosciences, Keio University, Yamagata, Japan
| | - Masahiro Sugimoto
- Institute for Advanced Biosciences, Keio University, Yamagata, Japan
| | - Chiho Sumi-Ichinose
- Department of Pharmacology, School of Medicine, Fujita Health University, Toyoake, Japan
| | - Kazunao Kondo
- Department of Pharmacology, School of Medicine, Fujita Health University, Toyoake, Japan
| | - Keizo Takao
- Genetic Engineering and Functional Genomics Group, Frontier Technology Center, Graduate School of Medicine, Kyoto University, Kyoto, Japan
- Department Behavioral Physiology, Faculty of Medicine, University of Toyama, Toyama, Japan
- Research Center for Idling Brain Science, University of Toyama, Toyama, Japan
- Section of Behavior Patterns, Center for Genetic Analysis of Behavior, National Institute for Physiological Sciences, Okazaki, Aichi, Japan
| | - Tsuyoshi Miyakawa
- Genetic Engineering and Functional Genomics Group, Frontier Technology Center, Graduate School of Medicine, Kyoto University, Kyoto, Japan
- Section of Behavior Patterns, Center for Genetic Analysis of Behavior, National Institute for Physiological Sciences, Okazaki, Aichi, Japan
- Division of Systems Medical Science, Institute for Comprehensive Medical Science, Fujita Health University, Toyoake, Japan
| | - Hiroshi Ichinose
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Japan
| |
Collapse
|
8
|
Feng Y, Feng Y, Gu L, Liu P, Cao J, Zhang S. The Critical Role of Tetrahydrobiopterin (BH4) Metabolism in Modulating Radiosensitivity: BH4/NOS Axis as an Angel or a Devil. Front Oncol 2021; 11:720632. [PMID: 34513700 PMCID: PMC8429800 DOI: 10.3389/fonc.2021.720632] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Accepted: 08/12/2021] [Indexed: 12/16/2022] Open
Abstract
Ionizing radiation and radioactive materials have been widely used in industry, medicine, science and military. The efficacy of radiotherapy and adverse effects of normal tissues are closed related to cellular radiosensitivity. Molecular mechanisms underlying radiosensitivity are of significance to tumor cell radiosensitization as well as normal tissue radioprotection. 5,6,7,8-Tetrahydrobiopterin (BH4) is an essential cofactor for nitric oxide synthases (NOS) and aromatic amino acid hydroxylases, and its biosynthesis involves de novo biosynthesis and a pterin salvage pathway. In this review we overview the role of BH4 metabolism in modulating radiosensitivity. BH4 homeostasis determines the role of NOS, affecting the production of nitric oxide (NO) and oxygen free radicals. Under conditions of oxidative stress, such as UV-radiation and ionizing radiation, BH4 availability is diminished due to its oxidation, which subsequently leads to NOS uncoupling and generation of highly oxidative free radicals. On the other hand, BH4/NOS axis facilitates vascular normalization, a process by which antiangiogenic therapy corrects structural and functional flaws of tumor blood vessels, which enhances radiotherapy efficacy. Therefore, BH4/NOS axis may serve as an angel or a devil in regulating cellular radiosensitivity. Finally, we will address future perspectives, not only from the standpoint of perceived advances in treatment, but also from the potential mechanisms. These advances have demonstrated that it is possible to modulate cellular radiosensitivity through BH4 metabolism.
Collapse
Affiliation(s)
- Yang Feng
- School of Radiation Medicine and Protection, State Key Laboratory of Radiation Medicine, Soochow University, Suzhou, China
| | - Yahui Feng
- China National Nuclear Corporation 416 Hospital (Second Affiliated Hospital of Chengdu Medical College), Chengdu, China
| | - Liming Gu
- School of Radiation Medicine and Protection, State Key Laboratory of Radiation Medicine, Soochow University, Suzhou, China
| | - Pengfei Liu
- School of Radiation Medicine and Protection, State Key Laboratory of Radiation Medicine, Soochow University, Suzhou, China
| | - Jianping Cao
- School of Radiation Medicine and Protection, State Key Laboratory of Radiation Medicine, Soochow University, Suzhou, China
| | - Shuyu Zhang
- China National Nuclear Corporation 416 Hospital (Second Affiliated Hospital of Chengdu Medical College), Chengdu, China.,West China Second University Hospital, Sichuan University, Chengdu, China.,West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, China
| |
Collapse
|
9
|
Ushio-Fukai M, Ash D, Nagarkoti S, Belin de Chantemèle EJ, Fulton DJR, Fukai T. Interplay Between Reactive Oxygen/Reactive Nitrogen Species and Metabolism in Vascular Biology and Disease. Antioxid Redox Signal 2021; 34:1319-1354. [PMID: 33899493 PMCID: PMC8418449 DOI: 10.1089/ars.2020.8161] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Reactive oxygen species (ROS; e.g., superoxide [O2•-] and hydrogen peroxide [H2O2]) and reactive nitrogen species (RNS; e.g., nitric oxide [NO•]) at the physiological level function as signaling molecules that mediate many biological responses, including cell proliferation, migration, differentiation, and gene expression. By contrast, excess ROS/RNS, a consequence of dysregulated redox homeostasis, is a hallmark of cardiovascular disease. Accumulating evidence suggests that both ROS and RNS regulate various metabolic pathways and enzymes. Recent studies indicate that cells have mechanisms that fine-tune ROS/RNS levels by tight regulation of metabolic pathways, such as glycolysis and oxidative phosphorylation. The ROS/RNS-mediated inhibition of glycolytic pathways promotes metabolic reprogramming away from glycolytic flux toward the oxidative pentose phosphate pathway to generate nicotinamide adenine dinucleotide phosphate (NADPH) for antioxidant defense. This review summarizes our current knowledge of the mechanisms by which ROS/RNS regulate metabolic enzymes and cellular metabolism and how cellular metabolism influences redox homeostasis and the pathogenesis of disease. A full understanding of these mechanisms will be important for the development of new therapeutic strategies to treat diseases associated with dysregulated redox homeostasis and metabolism. Antioxid. Redox Signal. 34, 1319-1354.
Collapse
Affiliation(s)
- Masuko Ushio-Fukai
- Vascular Biology Center, Medical College of Georgia, Augusta University, Augusta, Georgia, USA.,Department of Medicine (Cardiology) and Medical College of Georgia, Augusta University, Augusta, Georgia, USA
| | - Dipankar Ash
- Vascular Biology Center, Medical College of Georgia, Augusta University, Augusta, Georgia, USA.,Department of Medicine (Cardiology) and Medical College of Georgia, Augusta University, Augusta, Georgia, USA
| | - Sheela Nagarkoti
- Vascular Biology Center, Medical College of Georgia, Augusta University, Augusta, Georgia, USA.,Department of Medicine (Cardiology) and Medical College of Georgia, Augusta University, Augusta, Georgia, USA
| | - Eric J Belin de Chantemèle
- Vascular Biology Center, Medical College of Georgia, Augusta University, Augusta, Georgia, USA.,Department of Medicine (Cardiology) and Medical College of Georgia, Augusta University, Augusta, Georgia, USA
| | - David J R Fulton
- Vascular Biology Center, Medical College of Georgia, Augusta University, Augusta, Georgia, USA.,Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, USA
| | - Tohru Fukai
- Vascular Biology Center, Medical College of Georgia, Augusta University, Augusta, Georgia, USA.,Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, USA.,Charlie Norwood Veterans Affairs Medical Center, Augusta, Georgia, USA
| |
Collapse
|
10
|
Boonpattrawong NP, Golbidi S, Tai DC, Aleliunas RE, Bernatchez P, Miller JW, Laher I, Devlin AM. Exercise during pregnancy mitigates the adverse effects of maternal obesity on adult male offspring vascular function and alters one-carbon metabolism. Physiol Rep 2020; 8:e14582. [PMID: 32975908 PMCID: PMC7518297 DOI: 10.14814/phy2.14582] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Accepted: 08/22/2020] [Indexed: 12/15/2022] Open
Abstract
Maternal obesity during pregnancy can adversely affect adult offspring vascular endothelial function. This study examined whether maternal exercise during pregnancy and lactation mitigates the adverse effects of maternal obesity on offspring vascular endothelial function. Female (C57BL/6N) mice were fed from weaning a control diet (10% kcal fat) or western diet (45% kcal fat) to induce excess adiposity (maternal obesity). After 13 weeks, the female mice were bred and maintained on the diets, with and without access to a running wheel (exercise), throughout breeding, pregnancy, and lactation. Offspring were weaned onto the control or western diet and fed for 13 weeks; male offspring were studied. Maternal exercise prevented the adverse effects of maternal obesity on offspring vascular endothelial function. However, this was dependent on offspring diet and the positive effect of maternal exercise was only observed in offspring fed the western diet. This was accompanied by alterations in aorta and liver one-carbon metabolism, suggesting a role for these pathways in the improved endothelial function observed in the offspring. Obesity and exercise had no effect on endothelial function in the dams but did affect aorta and liver one-carbon metabolism, suggesting the phenotype observed in the offspring may be due to obesity and exercise-induced changes in one-carbon metabolism in the dams. Our findings demonstrate that maternal exercise prevented vascular dysfunction in male offspring from obese dams and is associated with alterations in one-carbon metabolism.
Collapse
Affiliation(s)
- Nicha P. Boonpattrawong
- Department of Pathology and Laboratory MedicineThe University of British Columbia, and BC Children’s Hospital Research InstituteVancouverBCCanada
| | - Saeid Golbidi
- Department of Family PracticeThe University of British Columbia, and BC Children’s Hospital Research InstituteVancouverBCCanada
| | - Daven C. Tai
- Department of PediatricsThe University of British Columbia, and BC Children’s Hospital Research InstituteVancouverBCCanada
| | - Rika E. Aleliunas
- Department of PediatricsThe University of British Columbia, and BC Children’s Hospital Research InstituteVancouverBCCanada
| | - Pascal Bernatchez
- Department of Anesthesiology, Pharmacology and TherapeuticsThe University of British ColumbiaVancouverBCCanada
| | - Joshua W. Miller
- Department of Nutritional SciencesRutgers UniversityThe State University of New JerseyNew BrunswickNJUSA
| | - Ismail Laher
- Department of Anesthesiology, Pharmacology and TherapeuticsThe University of British ColumbiaVancouverBCCanada
| | - Angela M. Devlin
- Department of Pathology and Laboratory MedicineThe University of British Columbia, and BC Children’s Hospital Research InstituteVancouverBCCanada
- Department of PediatricsThe University of British Columbia, and BC Children’s Hospital Research InstituteVancouverBCCanada
| |
Collapse
|
11
|
Belikov AV. Age-related diseases as vicious cycles. Ageing Res Rev 2019; 49:11-26. [PMID: 30458244 DOI: 10.1016/j.arr.2018.11.002] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2018] [Revised: 10/05/2018] [Accepted: 11/15/2018] [Indexed: 02/07/2023]
Abstract
The mortality rates of age-related diseases (ARDs) increase exponentially with age. Processes described by the exponential growth function typically involve a branching chain reaction or, more generally, a positive feedback loop. Here I propose that each ARD is mediated by one or several positive feedback loops (vicious cycles). I then identify critical vicious cycles in five major ARDs: atherosclerosis, hypertension, diabetes, Alzheimer's and Parkinson's. I also propose that the progression of ARDs can be halted by selectively interrupting the vicious cycles and suggest the most promising targets.
Collapse
Affiliation(s)
- Aleksey V Belikov
- Laboratory of Innovative Medicine, School of Biological and Medical Physics, Moscow Institute of Physics and Technology, Institutsky per., 9, 141701 Dolgoprudny, Moscow Region, Russia.
| |
Collapse
|
12
|
Ohashi A, Mamada K, Harada T, Naito M, Takahashi T, Aizawa S, Hasegawa H. Organic anion transporters, OAT1 and OAT3, are crucial biopterin transporters involved in bodily distribution of tetrahydrobiopterin and exclusion of its excess. Mol Cell Biochem 2017; 435:97-108. [PMID: 28534121 PMCID: PMC5632347 DOI: 10.1007/s11010-017-3060-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Accepted: 05/04/2017] [Indexed: 01/05/2023]
Abstract
Tetrahydrobiopterin (BH4) is a common coenzyme of phenylalanine-, tyrosine-, and tryptophan hydroxylases, alkylglycerol monooxygenase, and NO synthases (NOS). Synthetic BH4 is used medicinally for BH4-responsive phenylketonuria and inherited BH4 deficiency. BH4 supplementation has also drawn attention as a therapy for various NOS-related cardio-vascular diseases, but its use has met with limited success in decreasing BH2, the oxidized form of BH4. An increase in the BH2/BH4 ratio leads to NOS dysfunction. Previous studies revealed that BH4 supplementation caused a rapid urinary loss of BH4 accompanied by an increase in the blood BH2/BH4 ratio and an involvement of probenecid-sensitive but unknown transporters was strongly suggested in these processes. Here we show that OAT1 and OAT3 enabled cells to take up BP (BH4 and/or BH2) in a probenecid-sensitive manner using rat kidney slices and transporter-expressing cell systems, LLC-PK1 cells and Xenopus oocytes. Both OAT1 and OAT3 preferred BH2 and sepiapterin as their substrate roughly 5- to 10-fold more than BH4. Administration of probenecid acutely reduced the urinary exclusion of endogenous BP accompanied by a rise in blood BP in vivo. These results indicated that OAT1 and OAT3 played crucial roles: (1) in determining baseline levels of blood BP by excluding endogenous BP through the urine, (2) in the rapid distribution to organs of exogenous BH4 and the exclusion to urine of a BH4 excess, particularly when BH4 was administered, and (3) in scavenging blood BH2 by cellular uptake as the gateway to the salvage pathway of BH4, which reduces BH2 back to BH4.
Collapse
Affiliation(s)
- Akiko Ohashi
- Department of Anatomy, Nihon University School of Dentistry, 1-8-13, Kanda-Surugadai, Chiyoda, Tokyo, 101-8310, Japan.
- Division of Functional Morphology, Dental Research Center, Nihon University School of Dentistry, Chiyoda, Tokyo, 101-8310, Japan.
| | - Kaori Mamada
- Department of Biosciences, Teikyo University of Science and Technology, Uenohara, Yamanashi, 401-0193, Japan
| | - Tomonori Harada
- Division of Anatomical Science, Department of Functional Morphology, Nihon University School of Medicine, Itabashi, Tokyo, 173-8610, Japan
| | - Masako Naito
- Department of Anatomy, Nihon University School of Dentistry, 1-8-13, Kanda-Surugadai, Chiyoda, Tokyo, 101-8310, Japan
- Division of Functional Morphology, Dental Research Center, Nihon University School of Dentistry, Chiyoda, Tokyo, 101-8310, Japan
| | - Tomihisa Takahashi
- Department of Anatomy, Nihon University School of Dentistry, 1-8-13, Kanda-Surugadai, Chiyoda, Tokyo, 101-8310, Japan
- Division of Functional Morphology, Dental Research Center, Nihon University School of Dentistry, Chiyoda, Tokyo, 101-8310, Japan
| | - Shin Aizawa
- Division of Anatomical Science, Department of Functional Morphology, Nihon University School of Medicine, Itabashi, Tokyo, 173-8610, Japan
| | - Hiroyuki Hasegawa
- Department of Anatomy, Nihon University School of Dentistry, 1-8-13, Kanda-Surugadai, Chiyoda, Tokyo, 101-8310, Japan
| |
Collapse
|
13
|
Engin AB, Engin A. The Interactions Between Kynurenine, Folate, Methionine and Pteridine Pathways in Obesity. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 960:511-527. [PMID: 28585214 DOI: 10.1007/978-3-319-48382-5_22] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Obesity activates both innate and adaptive immune responses in adipose tissue. Elevated levels of eosinophils with depression of monocyte and neutrophil indicate the deficiencies in the immune system of morbidly obese individuals. Actually, adipose tissue macrophages are functional antigen-presenting cells that promote the proliferation of interferon-gamma (IFN-gamma)-producing CD4+ T cells in adipose tissue of obese subjects. Eventually, diet-induced obesity is associated with the loss of tissue homeostasis and development of type 1 inflammatory responses in visceral adipose tissue. Activity of inducible indoleamine 2,3-dioxygenase-1 (IDO-1) plays a major role under pro-inflammatory, IFN-gamma dominated settings. One of the two rate-limiting enzymes which can metabolize tryptophan to kynurenine is IDO-1. Tumor necrosis factor-alpha (TNF-alpha) correlates with IDO-1 in adipose compartments. Actually, IDO-1-mediated tryptophan catabolism due to chronic immune activation is the cause of reduced tryptophan plasma levels and be considered as the driving force for food intake in morbidly obese patients. Thus, decrease in plasma tryptophan levels and subsequent reduction in serotonin (5-HT) production provokes satiety dysregulation that leads to increased caloric uptake and obesity. However, after bariatric surgery, weight reduction does not lead to normalization of IDO-1 activity. Furthermore, there is a connection between arginine and tryptophan metabolic pathways in the generation of reactive nitrogen intermediates. Hence, abdominal obesity is associated with vascular endothelial dysfunction and reduced nitric oxide (NO) availability. IFN-gamma-induced activation of the inducible nitric oxide synthase (iNOS) and dissociation of endothelial adenosine monophosphate activated protein kinase (AMPK)- phosphoinositide 3-kinase (PI3K)-protein kinase B (Akt)- endothelial NO synthase (eNOS) pathway enhances oxidative stress production secondary to high-fat diet. Thus, reduced endothelial NO availability correlates with the increase in plasma non-esterified fatty acids and triglycerides levels. Additionally, in obese patients, folate-deficiency leads to hyperhomocysteinemia. Folic acid confers protection against hyperhomocysteinemia-induced oxidative stress.
Collapse
Affiliation(s)
- Ayse Basak Engin
- Faculty of Pharmacy, Department of Toxicology, Gazi University, Hipodrom, Ankara, Turkey.
| | - Atilla Engin
- Faculty of Medicine, Department of General Surgery, Gazi University, Besevler, Ankara, Turkey.
- , Mustafa Kemal Mah. 2137. Sok. 8/14, 06520, Cankaya, Ankara, Turkey.
| |
Collapse
|
14
|
Ohashi A, Saeki Y, Harada T, Naito M, Takahashi T, Aizawa S, Hasegawa H. Tetrahydrobiopterin Supplementation: Elevation of Tissue Biopterin Levels Accompanied by a Relative Increase in Dihydrobiopterin in the Blood and the Role of Probenecid-Sensitive Uptake in Scavenging Dihydrobiopterin in the Liver and Kidney of Rats. PLoS One 2016; 11:e0164305. [PMID: 27711248 PMCID: PMC5053593 DOI: 10.1371/journal.pone.0164305] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Accepted: 09/22/2016] [Indexed: 12/21/2022] Open
Abstract
Tetrahydrobiopterin (BH4) is an essential cofactor of nitric oxide synthase (NOS) and aromatic amino acid hydroxylases. BH4 and 7,8-dihydrobiopterin (BH2) are metabolically interchangeable at the expense of NADPH. Exogenously administered BH4 can be metabolized by the body, similar to vitamins. At present, synthetic BH4 is used as an orphan drug for patients with inherited diseases requiring BH4 supplementation. BH4 supplementation has also drawn attention as a means of treating certain cardiovascular symptoms, however, its application in human patients remains limited. Here, we tracked biopterin (BP) distribution in blood, bile, urine, liver, kidney and brain after BH4 administration (5 mg/kg rat, i.v.) with or without prior treatment with probenecid, a potent inhibitor of uptake transporters particularly including organic anion transporter families such as OTA1 and OAT3. The rapid excretion of BP in urine was driven by elevated blood concentrations and its elimination reached about 90% within 120 min. In the very early period, BP was taken up by the liver and kidney and gradually released back to the blood. BH4 administration caused a considerable decrease in the BH4% in blood BP as an inevitable compensatory process. Probenecid treatment slowed down the decrease in blood BP and simultaneously inhibited its initial rapid excretion in the kidney. At the same time, the BH4% was further lowered, suggesting that the probenecid-sensitive BP uptake played a crucial role in BH2 scavenging in vivo. This suggested that the overproduced BH2 was taken up by organs by means of the probenecid-sensitive process, and was then scavenged by counter-conversion to BH4 via the BH4 salvage pathway. Taken together, BH4 administration was effective at raising BP levels in organs over the course of hours but with extremely low efficiency. Since a high BH2 relative to BH4 causes NOS dysfunction, the lowering of the BH4% must be avoided in practice, otherwise the desired effect of the supplementation in ameliorating NOS dysfunction would be spoiled.
Collapse
Affiliation(s)
- Akiko Ohashi
- Department of Anatomy, Nihon University School of Dentistry, Chiyoda, Tokyo, Japan
| | - Yusuke Saeki
- Department of Biosciences, Teikyo University of Science and TechnologyUenohara, Yamanashi, Japan
| | - Tomonori Harada
- Division of Anatomical Science, Department of Functional Morphology, Nihon University School of Medicine, Itabashi, Tokyo, Japan
| | - Masako Naito
- Department of Anatomy, Nihon University School of Dentistry, Chiyoda, Tokyo, Japan
| | - Tomihisa Takahashi
- Department of Anatomy, Nihon University School of Dentistry, Chiyoda, Tokyo, Japan
| | - Shin Aizawa
- Division of Anatomical Science, Department of Functional Morphology, Nihon University School of Medicine, Itabashi, Tokyo, Japan
| | - Hiroyuki Hasegawa
- Department of Anatomy, Nihon University School of Dentistry, Chiyoda, Tokyo, Japan
- Division of Anatomical Science, Department of Functional Morphology, Nihon University School of Medicine, Itabashi, Tokyo, Japan
| |
Collapse
|
15
|
Raphael S. Tetrahydrobiopterin Concentrations in Normal and Coronary Artery Diseased Heart Tissue. ACTA ACUST UNITED AC 2016. [DOI: 10.17352/2455-2976.000023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
16
|
Sethumadhavan S, Whitsett J, Bennett B, Ionova IA, Pieper GM, Vasquez-Vivar J. Increasing tetrahydrobiopterin in cardiomyocytes adversely affects cardiac redox state and mitochondrial function independently of changes in NO production. Free Radic Biol Med 2016; 93:1-11. [PMID: 26826575 PMCID: PMC5498285 DOI: 10.1016/j.freeradbiomed.2016.01.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Revised: 12/31/2015] [Accepted: 01/25/2016] [Indexed: 02/07/2023]
Abstract
Tetrahydrobiopterin (BH4) represents a potential strategy for the treatment of cardiac remodeling, fibrosis and/or diastolic dysfunction. The effects of oral treatment with BH4 (Sapropterin™ or Kuvan™) are however dose-limiting with high dose negating functional improvements. Cardiomyocyte-specific overexpression of GTP cyclohydrolase I (mGCH) increases BH4 several-fold in the heart. Using this model, we aimed to establish the cardiomyocyte-specific responses to high levels of BH4. Quantification of BH4 and BH2 in mGCH transgenic hearts showed age-based variations in BH4:BH2 ratios. Hearts of mice (<6 months) have lower BH4:BH2 ratios than hearts of older mice while both GTPCH activity and tissue ascorbate levels were higher in hearts of young than older mice. No evident changes in nitric oxide (NO) production assessed by nitrite and endogenous iron-nitrosyl complexes were detected in any of the age groups. Increased BH4 production in cardiomyocytes resulted in a significant loss of mitochondrial function. Diminished oxygen consumption and reserve capacity was verified in mitochondria isolated from hearts of 12-month old compared to 3-month old mice, even though at 12 months an improved BH4:BH2 ratio is established. Accumulation of 4-hydroxynonenal (4-HNE) and decreased glutathione levels were found in the mGCH hearts and isolated mitochondria. Taken together, our results indicate that the ratio of BH4:BH2 does not predict changes in neither NO levels nor cellular redox state in the heart. The BH4 oxidation essentially limits the capacity of cardiomyocytes to reduce oxidant stress. Cardiomyocyte with chronically high levels of BH4 show a significant decline in redox state and mitochondrial function.
Collapse
Affiliation(s)
- Savitha Sethumadhavan
- Department of Biophysics, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA
| | - Jennifer Whitsett
- Department of Biophysics, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA
| | - Brian Bennett
- Department of Biophysics, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA; Department of Physics, Marquette University, Milwaukee, 1250 W Wisconsin Ave, Milwaukee, WI 53233, USA
| | - Irina A Ionova
- Department of Surgery Medicine, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA
| | - Galen M Pieper
- Department of Surgery Medicine, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA
| | - Jeannette Vasquez-Vivar
- Department of Biophysics, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA
| |
Collapse
|
17
|
Cai Z, Lu Q, Ding Y, Wang Q, Xiao L, Song P, Zou MH. Endothelial Nitric Oxide Synthase-Derived Nitric Oxide Prevents Dihydrofolate Reductase Degradation via Promoting S-Nitrosylation. Arterioscler Thromb Vasc Biol 2015; 35:2366-73. [PMID: 26381869 PMCID: PMC4758687 DOI: 10.1161/atvbaha.115.305796] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Accepted: 09/04/2015] [Indexed: 02/07/2023]
Abstract
OBJECTIVE Dihydrofolate reductase (DHFR) is a key protein involved in tetrahydrobiopterin (BH4) regeneration from 7,8-dihydrobiopterin (BH2). Dysfunctional DHFR may induce endothelial nitric oxide (NO) synthase (eNOS) uncoupling resulting in enzyme production of superoxide anions instead of NO. The mechanism by which DHFR is regulated is unknown. Here, we investigate whether eNOS-derived NO maintains DHFR stability. APPROACH AND RESULTS DHFR activity, BH4 content, eNOS activity, and S-nitrosylation were assessed in human umbilical vein endothelial cells and in aortas isolated from wild-type and eNOS knockout mice. In human umbilical vein endothelial cells, depletion of intracellular NO by transfection with eNOS-specific siRNA or by the NO scavenger 2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (PTIO)-both of which had no effect on DHFR mRNA levels-markedly reduced DHFR protein levels in parallel with increased DHFR polyubiquitination. Supplementation of S-nitroso-l-glutathione (GSNO), a NO donor, or MG132, a potent inhibitor of the 26S proteasome, prevented eNOS silencing and PTIO-induced DHFR reduction in human umbilical vein endothelial cells. PTIO suppressed S-nitrosylation of DHFR, whereas GSNO promoted DHFR S-nitrosylation. Mutational analysis confirmed that cysteine 7 of DHFR was S-nitrosylated. Cysteine 7 S-nitrosylation stabilized DHFR from ubiquitination and degradation. Experiments performed in aortas confirmed that PTIO or eNOS deficiency reduces endothelial DHFR, which can be abolished by MG132 supplementation. CONCLUSIONS We conclude that S-nitrosylation of DHFR at cysteine 7 by eNOS-derived NO is crucial for DHFR stability. We also conclude that NO-induced stabilization of DHFR prevents eNOS uncoupling via regeneration of BH4, an essential eNOS cofactor.
Collapse
Affiliation(s)
- Zhejun Cai
- From the Center for Molecular and Translational Medicine, Georgia State University, Atlanta (Z.C., Q.L., Y.D., Q.W., L.X., P.S., M.-H.Z.); and Department of Cardiology, Second Affiliated Hospital, Zhejiang University College of Medicine, Zhejiang, China (Z.C.)
| | - Qiulun Lu
- From the Center for Molecular and Translational Medicine, Georgia State University, Atlanta (Z.C., Q.L., Y.D., Q.W., L.X., P.S., M.-H.Z.); and Department of Cardiology, Second Affiliated Hospital, Zhejiang University College of Medicine, Zhejiang, China (Z.C.)
| | - Ye Ding
- From the Center for Molecular and Translational Medicine, Georgia State University, Atlanta (Z.C., Q.L., Y.D., Q.W., L.X., P.S., M.-H.Z.); and Department of Cardiology, Second Affiliated Hospital, Zhejiang University College of Medicine, Zhejiang, China (Z.C.)
| | - Qilong Wang
- From the Center for Molecular and Translational Medicine, Georgia State University, Atlanta (Z.C., Q.L., Y.D., Q.W., L.X., P.S., M.-H.Z.); and Department of Cardiology, Second Affiliated Hospital, Zhejiang University College of Medicine, Zhejiang, China (Z.C.)
| | - Lei Xiao
- From the Center for Molecular and Translational Medicine, Georgia State University, Atlanta (Z.C., Q.L., Y.D., Q.W., L.X., P.S., M.-H.Z.); and Department of Cardiology, Second Affiliated Hospital, Zhejiang University College of Medicine, Zhejiang, China (Z.C.)
| | - Ping Song
- From the Center for Molecular and Translational Medicine, Georgia State University, Atlanta (Z.C., Q.L., Y.D., Q.W., L.X., P.S., M.-H.Z.); and Department of Cardiology, Second Affiliated Hospital, Zhejiang University College of Medicine, Zhejiang, China (Z.C.)
| | - Ming-Hui Zou
- From the Center for Molecular and Translational Medicine, Georgia State University, Atlanta (Z.C., Q.L., Y.D., Q.W., L.X., P.S., M.-H.Z.); and Department of Cardiology, Second Affiliated Hospital, Zhejiang University College of Medicine, Zhejiang, China (Z.C.).
| |
Collapse
|
18
|
Philip D, Buch A, Moorthy D, Scott TM, Parnell LD, Lai CQ, Ordovás JM, Selhub J, Rosenberg IH, Tucker KL, Troen AM. Dihydrofolate reductase 19-bp deletion polymorphism modifies the association of folate status with memory in a cross-sectional multi-ethnic study of adults. Am J Clin Nutr 2015; 102:1279-88. [PMID: 26354538 PMCID: PMC4625589 DOI: 10.3945/ajcn.115.111054] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Accepted: 08/13/2015] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Folate status has been positively associated with cognitive function in many studies; however, some studies have observed associations of poor cognitive outcomes with high folate. In search of an explanation, we hypothesized that the association of folate with cognition would be modified by the interaction of high-folate status with a common 19-bp deletion polymorphism in the dihydrofolate reductase (DHFR) gene. To our knowledge, the cognitive effects of this gene have not been studied previously. OBJECTIVE We examined the association between cognitive outcomes with the 19-bp deletion DHFR polymorphism, folate status, and their interaction with high or normal plasma folate. DESIGN This was a pooled cross-sectional study of the following 2 Boston-based cohorts of community living adults: the Boston Puerto Rican Health Study and the Nutrition, Aging, and Memory in Elders study. Individuals were genotyped for the DHFR 19-bp deletion genotype, and plasma folate status was determined. Cognitive outcomes included the Mini-Mental State Examination, Center for Epidemiologic Studies Depression Scale, and factor scores for the domains of memory, executive function, and attention from a set of cognitive tests. RESULTS The prevalence of the homozygous deletion (del/del) genotype was 23%. In a multivariable analysis, high folate status (>17.8 ng/mL) was associated with better memory scores than was normal-folate status (fourth-fifth quintiles compared with first-third quintiles: β ± SE = -0.22 ± 0.06, P < 0.01). Carriers of the DHFR del/del genotype had worse memory scores (β ± SE = -0.24 ± 0.10, P < 0.05) and worse executive scores (β = -0.19, P < 0.05) than did those with the del/ins and ins/ins genotypes. Finally, we observed an interaction such that carriers of the del/del genotype with high folate had significantly worse memory scores than those of both noncarriers with high-folate and del/del carriers with normal-folate (β-interaction = 0.26 ± 0.13, P < 0.05). CONCLUSIONS This study identifies a putative gene-nutrient interaction that, if confirmed, would predict that a sizable minority carrying the del/del genotype might not benefit from high-folate status and could see a worsening of memory. An understanding of how genetic variation affects responses to high-folate exposure will help weigh risks and benefits of folate supplementation for individuals and public health.
Collapse
Affiliation(s)
- Dana Philip
- Nutrition and Brain Health Laboratory, Institute of Biochemistry, Food Science and Nutrition, Robert H Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel
| | - Assaf Buch
- Nutrition and Brain Health Laboratory, Institute of Biochemistry, Food Science and Nutrition, Robert H Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel
| | | | | | | | | | | | | | | | - Katherine L Tucker
- Nutritional Epidemiology Program, Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA; and Department of Clinical Laboratory and Nutritional Sciences at University of Massachusetts, Lowell, MA
| | - Aron M Troen
- Nutrition and Brain Health Laboratory, Institute of Biochemistry, Food Science and Nutrition, Robert H Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel; Neuroscience and Aging Laboratory,
| |
Collapse
|
19
|
Serum Phenylalanine, Tyrosine, and their Ratio in Acute Ischemic Stroke: on the Trail of a Biomarker? J Mol Neurosci 2015; 58:102-8. [PMID: 26423306 DOI: 10.1007/s12031-015-0659-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Accepted: 09/21/2015] [Indexed: 01/05/2023]
Abstract
Fast diagnosis and appropriate treatment are of utmost importance to improving the outcome in patients with acute ischemic stroke (AIS). A rapid and sensitive blood test for ischemic stroke is required. The aim of this study was to examine the usefulness of phenylalanine (PHE) and tyrosine (TYR) as diagnostic biomarkers in AIS. Serum levels of PHE and TYR, measured using HPLC, and their ratio (PHE/TYR) were compared between 45 patients with AIS and 40 healthy control subjects. The relationship between PHE/TYR and the serum levels of several cytokines were also examined. PHE/TYR was significantly higher in AIS patients than in healthy controls (1.75 vs 1.24, p < 0.001). A receiver operating characteristic (ROC) curve analysis of PHE/TYR in AIS patients relative to healthy controls revealed promising sensitivity and specificity, which at an optimal cutoff of 1.45 were 76 and 85 %, respectively. PHE/TYR was positively correlated with interleukin (IL)-1β (r = 0.37, p = 0.011) and IL-6 (r = 0.33, p = 0.025). This study shows that PHE/TYR is highly elevated in the acute phase of AIS, and that this elevation is coupled to the inflammatory response. The ROC analysis documents the possible value of PHE/TYR as a biomarker for AIS and demonstrates its clinical potential as a blood-based test for AIS.
Collapse
|
20
|
Tetrahydrobiopterin improves endothelial function in cardiovascular disease: a systematic review. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2014; 2014:850312. [PMID: 25548592 PMCID: PMC4273464 DOI: 10.1155/2014/850312] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Accepted: 11/20/2014] [Indexed: 11/18/2022]
Abstract
Background. Tetrahydrobiopterin (BH4) is a cofactor of nitric oxide synthase (NOS). Nitric oxide (NO) bioavailability is reduced during the early stage of vascular diseases, such as coronary artery disease, hypercholesterolemia, hypertension, and diabetic vasculopathy, and even throughout the entire progression of atherosclerosis. Methods. A literature search was performed using electronic databases (up to January 31, 2014), including MEDLINE, EMBASE, and Cochrane Central Register of Controlled Trials (CENTRAL), using an established strategy. Results. Fourteen articles were selected with a total of 370 patients. Ten of the fourteen studies showed a significant improvement in the endothelial dysfunction of various cardiovascular disease groups with BH4 supplementation compared with the control groups or placebos. Three studies showed no positive outcome, and one study showed that low-dose BH4 had no effect but that high-dose BH4 did have a significantly different result. Conclusions. This review concludes that supplementation with BH4 and/or augmentation of the endogenous levels of BH4 will be a novel approach to improve the endothelial dysfunction observed in various cardiovascular diseases. BH4 might be considered to be a new therapeutic agent to prevent the initiation and progression of cardiovascular disease.
Collapse
|
21
|
Xu F, Sudo Y, Sanechika S, Yamashita J, Shimaguchi S, Honda SI, Sumi-Ichinose C, Mori-Kojima M, Nakata R, Furuta T, Sakurai M, Sugimoto M, Soga T, Kondo K, Ichinose H. Disturbed biopterin and folate metabolism in the Qdpr-deficient mouse. FEBS Lett 2014; 588:3924-31. [PMID: 25240194 DOI: 10.1016/j.febslet.2014.09.004] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Revised: 08/31/2014] [Accepted: 09/09/2014] [Indexed: 10/24/2022]
Abstract
Quinonoid dihydropteridine reductase (QDPR) catalyzes the regeneration of tetrahydrobiopterin (BH4), a cofactor for monoamine synthesis, phenylalanine hydroxylation and nitric oxide production. Here, we produced and analyzed a transgenic Qdpr(-/-) mouse model. Unexpectedly, the BH4 contents in the Qdpr(-/-) mice were not decreased and even increased in some tissues, whereas those of the oxidized form dihydrobiopterin (BH2) were significantly increased. We demonstrated that unlike the wild-type mice, dihydrofolate reductase regenerated BH4 from BH2 in the mutants. Furthermore, we revealed wide alterations in folate-associated metabolism in the Qdpr(-/-) mice, which suggests an interconnection between folate and biopterin metabolism in the transgenic mouse model.
Collapse
Affiliation(s)
- Feng Xu
- Department of Life Science, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama 226-8501, Japan
| | - Yusuke Sudo
- Department of Life Science, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama 226-8501, Japan
| | - Sho Sanechika
- Department of Life Science, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama 226-8501, Japan
| | - Junpei Yamashita
- Department of Life Science, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama 226-8501, Japan
| | - Sho Shimaguchi
- Department of Life Science, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama 226-8501, Japan
| | - Shun-ichiro Honda
- Department of Life Science, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama 226-8501, Japan
| | - Chiho Sumi-Ichinose
- Department of Pharmacology, School of Medicine, Fujita Health University, Toyoake, Aichi 470-1192, Japan
| | - Masayo Mori-Kojima
- Institute for Advanced Biosciences, Keio University, Tsuruoka, Yamagata 997-0052, Japan
| | - Rieko Nakata
- Department of Food Science and Nutrition, Nara Women's University, Nara 630-8506, Japan
| | - Tadaomi Furuta
- Center for Biological Resources and Informatics, Tokyo Institute of Technology, Yokohama 226-8501, Japan
| | - Minoru Sakurai
- Center for Biological Resources and Informatics, Tokyo Institute of Technology, Yokohama 226-8501, Japan
| | - Masahiro Sugimoto
- Institute for Advanced Biosciences, Keio University, Tsuruoka, Yamagata 997-0052, Japan
| | - Tomoyoshi Soga
- Institute for Advanced Biosciences, Keio University, Tsuruoka, Yamagata 997-0052, Japan
| | - Kazunao Kondo
- Department of Pharmacology, School of Medicine, Fujita Health University, Toyoake, Aichi 470-1192, Japan
| | - Hiroshi Ichinose
- Department of Life Science, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama 226-8501, Japan.
| |
Collapse
|
22
|
Schmidt K, Kolesnik B, Gorren ACF, Werner ER, Mayer B. Cell type-specific recycling of tetrahydrobiopterin by dihydrofolate reductase explains differential effects of 7,8-dihydrobiopterin on endothelial nitric oxide synthase uncoupling. Biochem Pharmacol 2014; 90:246-53. [PMID: 24863258 PMCID: PMC4099517 DOI: 10.1016/j.bcp.2014.05.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2014] [Revised: 05/14/2014] [Accepted: 05/14/2014] [Indexed: 11/26/2022]
Abstract
(6R)-5,6,7,8-Tetrahydro-L-biopterin (BH4) availability regulates nitric oxide and superoxide formation by endothelial nitric oxide synthase (eNOS). At low BH4 or low BH4 to 7,8-dihydrobiopterin (BH2) ratios the enzyme becomes uncoupled and generates superoxide at the expense of NO. We studied the effects of exogenously added BH2 on intracellular BH4/BH2 ratios and eNOS activity in different types of endothelial cells. Incubation of porcine aortic endothelial cells with BH2 increased BH4/BH2 ratios from 8.4 (controls) and 0.5 (BH4-depleted cells) up to ~20, demonstrating efficient reduction of BH2. Uncoupled eNOS activity observed in BH4-depleted cells was prevented by preincubation with BH2. Recycling of BH4 was much less efficient in human endothelial cells isolated from umbilical veins or derived from dermal microvessels (HMEC-1 cells), which exhibited eNOS uncoupling and low BH4/BH2 ratios under basal conditions and responded to exogenous BH2 with only moderate increases in BH4/BH2 ratios. The kinetics of dihydrofolate reductase-catalyzed BH4 recycling in endothelial cytosols showed that the apparent BH2 affinity of the enzyme was 50- to 300-fold higher in porcine than in human cell preparations. Thus, the differential regulation of eNOS uncoupling in different types of endothelial cells may be explained by striking differences in the apparent BH2 affinity of dihydrofolate reductase.
Collapse
Affiliation(s)
- Kurt Schmidt
- Department of Pharmacology and Toxicology, Karl-Franzens-Universität Graz, A-8010 Graz, Austria.
| | - Bernd Kolesnik
- Department of Pharmacology and Toxicology, Karl-Franzens-Universität Graz, A-8010 Graz, Austria
| | - Antonius C F Gorren
- Department of Pharmacology and Toxicology, Karl-Franzens-Universität Graz, A-8010 Graz, Austria
| | - Ernst R Werner
- Division of Biological Chemistry, Biocenter, Innsbruck Medical University, A-6020 Innsbruck, Austria
| | - Bernd Mayer
- Department of Pharmacology and Toxicology, Karl-Franzens-Universität Graz, A-8010 Graz, Austria
| |
Collapse
|
23
|
Samanta A, Datta S, Maity TR, Mandal A, Datta AK. Assessment of methotrexate on dihydrofolate reductase activity, total RNA content and cell division of Lathyrus sativus L. THE NUCLEUS 2014. [DOI: 10.1007/s13237-014-0115-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
|