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Chen C, Cai H, Shen J, Zhang X, Peng W, Li C, Lv H, Wen T. Exploration of a hypoxia-immune-related microenvironment gene signature and prediction model for hepatitis C-induced early-stage fibrosis. J Transl Med 2024; 22:116. [PMID: 38287425 PMCID: PMC10826039 DOI: 10.1186/s12967-024-04912-6] [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: 08/26/2023] [Accepted: 01/19/2024] [Indexed: 01/31/2024] Open
Abstract
BACKGROUND Liver fibrosis contributes to significant morbidity and mortality in Western nations, primarily attributed to chronic hepatitis C virus (HCV) infection. Hypoxia and immune status have been reported to be significantly correlated with the progression of liver fibrosis. The current research aimed to investigate the gene signature related to the hypoxia-immune-related microenvironment and identify potential targets for liver fibrosis. METHOD Sequencing data obtained from GEO were employed to assess the hypoxia and immune status of the discovery set utilizing UMAP and ESTIMATE methods. The prognostic genes were screened utilizing the LASSO model. The infiltration level of 22 types of immune cells was quantified utilizing CIBERSORT, and a prognosis-predictive model was established based on the selected genes. The model was also verified using qRT-PCR with surgical resection samples and liver failure samples RNA-sequencing data. RESULTS Elevated hypoxia and immune status were linked to an unfavorable prognosis in HCV-induced early-stage liver fibrosis. Increased plasma and resting NK cell infiltration were identified as a risk factor for liver fibrosis progression. Additionally, CYP1A2, CBS, GSTZ1, FOXA1, WDR72 and UHMK1 were determined as hypoxia-immune-related protective genes. The combined model effectively predicted patient prognosis. Furthermore, the preliminary validation of clinical samples supported most of the conclusions drawn from this study. CONCLUSION The prognosis-predictive model developed using six hypoxia-immune-related genes effectively predicts the prognosis and progression of liver fibrosis. The current study opens new avenues for the future prediction and treatment of liver fibrosis.
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Affiliation(s)
- Chuwen Chen
- Division of Liver Surgery, Department of General Surgery, West China Hospital, Si Chuan University, Chengdu, 610041, China
| | - Haozheng Cai
- Division of Liver Surgery, Department of General Surgery, West China Hospital, Si Chuan University, Chengdu, 610041, China
| | - Junyi Shen
- Division of Liver Surgery, Department of General Surgery, West China Hospital, Si Chuan University, Chengdu, 610041, China
| | - Xiaoyun Zhang
- Division of Liver Surgery, Department of General Surgery, West China Hospital, Si Chuan University, Chengdu, 610041, China
| | - Wei Peng
- Division of Liver Surgery, Department of General Surgery, West China Hospital, Si Chuan University, Chengdu, 610041, China
| | - Chuan Li
- Division of Liver Surgery, Department of General Surgery, West China Hospital, Si Chuan University, Chengdu, 610041, China
| | - Haopeng Lv
- Department of General Surgery, ChengDu Shi Xinjin Qu Renmin Yiyuan: People's Hospital of Xinjin District, Chengdu, China
| | - Tianfu Wen
- Division of Liver Surgery, Department of General Surgery, West China Hospital, Si Chuan University, Chengdu, 610041, China.
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Tripathi SJ, Chakraborty S, Miller E, Pieper AA, Paul BD. Hydrogen sulfide signalling in neurodegenerative diseases. Br J Pharmacol 2023:10.1111/bph.16170. [PMID: 37338307 PMCID: PMC10730776 DOI: 10.1111/bph.16170] [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: 05/17/2023] [Revised: 06/05/2023] [Accepted: 06/09/2023] [Indexed: 06/21/2023] Open
Abstract
The gaseous neurotransmitter hydrogen sulfide (H2 S) exerts neuroprotective efficacy in the brain via post-translational modification of cysteine residues by sulfhydration, also known as persulfidation. This process is comparable in biological impact to phosphorylation and mediates a variety of signalling events. Unlike conventional neurotransmitters, H2 S cannot be stored in vesicles due to its gaseous nature. Instead, it is either locally synthesized or released from endogenous stores. Sulfhydration affords both specific and general neuroprotective effects and is critically diminished in several neurodegenerative disorders. Conversely, some forms of neurodegenerative disease are linked to excessive cellular H2 S. Here, we review the signalling roles of H2 S across the spectrum of neurodegenerative diseases, including Huntington's disease, Parkinson's disease, Alzheimer's disease, Down syndrome, traumatic brain injury, the ataxias, and amyotrophic lateral sclerosis, as well as neurodegeneration generally associated with ageing.
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Affiliation(s)
- Sunil Jamuna Tripathi
- Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Suwarna Chakraborty
- Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Emiko Miller
- Brain Health Medicines Center, Harrington Discovery Institute, University Hospitals Cleveland Medical Center, Cleveland, Ohio, USA
| | - Andrew A Pieper
- Brain Health Medicines Center, Harrington Discovery Institute, University Hospitals Cleveland Medical Center, Cleveland, Ohio, USA
- Department of Psychiatry, Case Western Reserve University, Cleveland, Ohio, USA
- Geriatric Psychiatry, GRECC, Louis Stokes Cleveland VA Medical Center; Cleveland, Ohio, USA
- School of Medicine, Institute for Transformative Molecular Medicine, Case Western Reserve University, Cleveland, Ohio, USA
- Department of Pathology, School of Medicine, Case Western Reserve University, Cleveland, Ohio, USA
- Department of Neuroscience, School of Medicine, Case Western Reserve University, Cleveland, Ohio, USA
- Translational Therapeutics Core, Cleveland Alzheimer's Disease Research Center, Cleveland, Ohio, USA
| | - Bindu D Paul
- Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Lieber Institute for Brain Development, Baltimore, Maryland, USA
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Zhang Y, Jing M, Cai C, Zhu S, Zhang C, Wang Q, Zhai Y, Ji X, Wu D. Role of hydrogen sulphide in physiological and pathological angiogenesis. Cell Prolif 2022; 56:e13374. [PMID: 36478328 PMCID: PMC9977675 DOI: 10.1111/cpr.13374] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Revised: 11/08/2022] [Accepted: 11/21/2022] [Indexed: 12/12/2022] Open
Abstract
The role of hydrogen sulphide (H2 S) in angiogenesis has been widely demonstrated. Vascular endothelial growth factor (VEGF) plays an important role in H2 S-induced angiogenesis. H2 S promotes angiogenesis by upregulating VEGF via pro-angiogenic signal transduction. The involved signalling pathways include the mitogen-activated protein kinase pathway, phosphoinositide-3 kinase pathway, nitric oxide (NO) synthase/NO pathway, signal transducer and activator of transcription 3 (STAT3) pathway, and adenosine triphosphate (ATP)-sensitive potassium (KATP ) channels. H2 S has been shown to contribute to tumour angiogenesis, diabetic wound healing, angiogenesis in cardiac and cerebral ischaemic tissues, and physiological angiogenesis during the menstrual cycle and pregnancy. Furthermore, H2 S can exert an anti-angiogenic effect by inactivating Wnt/β-catenin signalling or blocking the STAT3 pathway in tumours. Therefore, H2 S plays a double-edged sword role in the process of angiogenesis. The regulation of H2 S production is a promising therapeutic approach for angiogenesis-associated diseases. Novel H2 S donors and/or inhibitors can be developed in the treatment of angiogenesis-dependent diseases.
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Affiliation(s)
- Yan‐Xia Zhang
- Henan International Joint Laboratory for Nuclear Protein Regulation, School of Basic Medical SciencesHenan UniversityKaifengHenanChina,Kaifeng Municipal Key Laboratory of Cell Signal Transduction, Henan Provincial Engineering Centre for Tumor Molecular MedicineHenan UniversityKaifengHenanChina
| | - Mi‐Rong Jing
- Henan International Joint Laboratory for Nuclear Protein Regulation, School of Basic Medical SciencesHenan UniversityKaifengHenanChina,Kaifeng Municipal Key Laboratory of Cell Signal Transduction, Henan Provincial Engineering Centre for Tumor Molecular MedicineHenan UniversityKaifengHenanChina
| | - Chun‐Bo Cai
- Henan International Joint Laboratory for Nuclear Protein Regulation, School of Basic Medical SciencesHenan UniversityKaifengHenanChina,Kaifeng Municipal Key Laboratory of Cell Signal Transduction, Henan Provincial Engineering Centre for Tumor Molecular MedicineHenan UniversityKaifengHenanChina
| | - Shuai‐Gang Zhu
- Henan International Joint Laboratory for Nuclear Protein Regulation, School of Basic Medical SciencesHenan UniversityKaifengHenanChina,Kaifeng Municipal Key Laboratory of Cell Signal Transduction, Henan Provincial Engineering Centre for Tumor Molecular MedicineHenan UniversityKaifengHenanChina
| | - Chao‐Jing Zhang
- Henan International Joint Laboratory for Nuclear Protein Regulation, School of Basic Medical SciencesHenan UniversityKaifengHenanChina,Kaifeng Municipal Key Laboratory of Cell Signal Transduction, Henan Provincial Engineering Centre for Tumor Molecular MedicineHenan UniversityKaifengHenanChina
| | - Qi‐Meng Wang
- Henan International Joint Laboratory for Nuclear Protein Regulation, School of Basic Medical SciencesHenan UniversityKaifengHenanChina,Kaifeng Municipal Key Laboratory of Cell Signal Transduction, Henan Provincial Engineering Centre for Tumor Molecular MedicineHenan UniversityKaifengHenanChina
| | - Yuan‐Kun Zhai
- Henan International Joint Laboratory for Nuclear Protein Regulation, School of Basic Medical SciencesHenan UniversityKaifengHenanChina,School of StomatologyHenan UniversityKaifengHenanChina
| | - Xin‐Ying Ji
- Henan International Joint Laboratory for Nuclear Protein Regulation, School of Basic Medical SciencesHenan UniversityKaifengHenanChina,Kaifeng Municipal Key Laboratory of Cell Signal Transduction, Henan Provincial Engineering Centre for Tumor Molecular MedicineHenan UniversityKaifengHenanChina,Kaifeng Key Laboratory of Infection and Biological Safety, School of Basic Medical SciencesHenan UniversityKaifengHenanChina
| | - Dong‐Dong Wu
- Henan International Joint Laboratory for Nuclear Protein Regulation, School of Basic Medical SciencesHenan UniversityKaifengHenanChina,Kaifeng Municipal Key Laboratory of Cell Signal Transduction, Henan Provincial Engineering Centre for Tumor Molecular MedicineHenan UniversityKaifengHenanChina,School of StomatologyHenan UniversityKaifengHenanChina
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Semenza GL. Hypoxia-inducible factors: roles in cardiovascular disease progression, prevention, and treatment. Cardiovasc Res 2022; 119:371-380. [PMID: 35687650 DOI: 10.1093/cvr/cvac089] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Indexed: 12/17/2022] Open
Abstract
Hypoxia-inducible factors (HIF)-1 and HIF-2 are master regulators of oxygen homeostasis that regulate the expression of thousands of genes in order to match O2 supply and demand. A large body of experimental data links HIF activity to protection against multiple disorders affecting the cardiovascular system: ischemic cardiovascular disease (including coronary artery disease and peripheral artery disease), through collateral blood vessel formation and preconditioning phenomena; emphysema; lymphedema; and lung transplant rejection. In these disorders, strategies to increase the expression of one or both HIFs may be of therapeutic utility. Conversely, extensive data link HIFs to the pathogenesis of pulmonary arterial hypertension and drugs that inhibit one or both HIFs may be useful in treating this disease.
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Affiliation(s)
- Gregg L Semenza
- Armstrong Oxygen Biology Research Center, Vascular Program, Institute for Cell Engineering; and Departments of Genetic Medicine, Pediatrics, Medicine, Oncology, Radiation Oncology, and Biological Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
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Ascenção K, Szabo C. Emerging roles of cystathionine β-synthase in various forms of cancer. Redox Biol 2022; 53:102331. [PMID: 35618601 PMCID: PMC9168780 DOI: 10.1016/j.redox.2022.102331] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 04/29/2022] [Accepted: 05/04/2022] [Indexed: 12/12/2022] Open
Abstract
The expression of the reverse transsulfuration enzyme cystathionine-β-synthase (CBS) is markedly increased in many forms of cancer, including colorectal, ovarian, lung, breast and kidney, while in other cancers (liver cancer and glioma) it becomes downregulated. According to the clinical database data in high-CBS-expressor cancers (e.g. colon or ovarian cancer), high CBS expression typically predicts lower survival, while in the low-CBS-expressor cancers (e.g. liver cancer), low CBS expression is associated with lower survival. In the high-CBS expressing tumor cells, CBS, and its product hydrogen sulfide (H2S) serves as a bioenergetic, proliferative, cytoprotective and stemness factor; it also supports angiogenesis and epithelial-to-mesenchymal transition in the cancer microenvironment. The current article reviews the various tumor-cell-supporting roles of the CBS/H2S axis in high-CBS expressor cancers and overviews the anticancer effects of CBS silencing and pharmacological CBS inhibition in various cancer models in vitro and in vivo; it also outlines potential approaches for biomarker identification, to support future targeted cancer therapies based on pharmacological CBS inhibition.
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Cirino G, Szabo C, Papapetropoulos A. Physiological roles of hydrogen sulfide in mammalian cells, tissues and organs. Physiol Rev 2022; 103:31-276. [DOI: 10.1152/physrev.00028.2021] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
H2S belongs to the class of molecules known as gasotransmitters, which also includes nitric oxide (NO) and carbon monoxide (CO). Three enzymes are recognized as endogenous sources of H2S in various cells and tissues: cystathionine g-lyase (CSE), cystathionine β-synthase (CBS) and 3-mercaptopyruvate sulfurtransferase (3-MST). The current article reviews the regulation of these enzymes as well as the pathways of their enzymatic and non-enzymatic degradation and elimination. The multiple interactions of H2S with other labile endogenous molecules (e.g. NO) and reactive oxygen species are also outlined. The various biological targets and signaling pathways are discussed, with special reference to H2S and oxidative posttranscriptional modification of proteins, the effect of H2S on channels and intracellular second messenger pathways, the regulation of gene transcription and translation and the regulation of cellular bioenergetics and metabolism. The pharmacological and molecular tools currently available to study H2S physiology are also reviewed, including their utility and limitations. In subsequent sections, the role of H2S in the regulation of various physiological and cellular functions is reviewed. The physiological role of H2S in various cell types and organ systems are overviewed. Finally, the role of H2S in the regulation of various organ functions is discussed as well as the characteristic bell-shaped biphasic effects of H2S. In addition, key pathophysiological aspects, debated areas, and future research and translational areas are identified A wide array of significant roles of H2S in the physiological regulation of all organ functions emerges from this review.
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Affiliation(s)
- Giuseppe Cirino
- Department of Pharmacy, School of Medicine, University of Naples Federico II, Naples, Italy
| | - Csaba Szabo
- Chair of Pharmacology, Section of Medicine, University of Fribourg, Switzerland
| | - Andreas Papapetropoulos
- Laboratory of Pharmacology, Faculty of Pharmacy, National and Kapodistrian University of Athens, Athens, Greece & Clinical, Experimental Surgery and Translational Research Center, Biomedical Research Foundation of the Academy of Athens, Greece
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Correia MJ, Pimpão AB, Fernandes DGF, Morello J, Sequeira CO, Calado J, Antunes AMM, Almeida MS, Branco P, Monteiro EC, Vicente JB, Serpa J, Pereira SA. Cysteine as a Multifaceted Player in Kidney, the Cysteine-Related Thiolome and Its Implications for Precision Medicine. Molecules 2022; 27:1416. [PMID: 35209204 PMCID: PMC8874463 DOI: 10.3390/molecules27041416] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Revised: 02/15/2022] [Accepted: 02/17/2022] [Indexed: 11/16/2022] Open
Abstract
In this review encouraged by original data, we first provided in vivo evidence that the kidney, comparative to the liver or brain, is an organ particularly rich in cysteine. In the kidney, the total availability of cysteine was higher in cortex tissue than in the medulla and distributed in free reduced, free oxidized and protein-bound fractions (in descending order). Next, we provided a comprehensive integrated review on the evidence that supports the reliance on cysteine of the kidney beyond cysteine antioxidant properties, highlighting the relevance of cysteine and its renal metabolism in the control of cysteine excess in the body as a pivotal source of metabolites to kidney biomass and bioenergetics and a promoter of adaptive responses to stressors. This view might translate into novel perspectives on the mechanisms of kidney function and blood pressure regulation and on clinical implications of the cysteine-related thiolome as a tool in precision medicine.
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Affiliation(s)
- Maria João Correia
- CEDOC, NOVA Medical School, Universidade Nova de Lisboa, 1169-056 Lisboa, Portugal; (M.J.C.); (A.B.P.); (J.M.); (C.O.S.); (M.S.A.); (P.B.); (E.C.M.); (J.S.)
| | - António B. Pimpão
- CEDOC, NOVA Medical School, Universidade Nova de Lisboa, 1169-056 Lisboa, Portugal; (M.J.C.); (A.B.P.); (J.M.); (C.O.S.); (M.S.A.); (P.B.); (E.C.M.); (J.S.)
| | - Dalila G. F. Fernandes
- Instituto de Tecnologia Química e Biológica António Xavier (ITQB NOVA), 2780-157 Oeiras, Portugal; (D.G.F.F.); (J.B.V.)
| | - Judit Morello
- CEDOC, NOVA Medical School, Universidade Nova de Lisboa, 1169-056 Lisboa, Portugal; (M.J.C.); (A.B.P.); (J.M.); (C.O.S.); (M.S.A.); (P.B.); (E.C.M.); (J.S.)
| | - Catarina O. Sequeira
- CEDOC, NOVA Medical School, Universidade Nova de Lisboa, 1169-056 Lisboa, Portugal; (M.J.C.); (A.B.P.); (J.M.); (C.O.S.); (M.S.A.); (P.B.); (E.C.M.); (J.S.)
| | - Joaquim Calado
- Centre for Toxicogenomics and Human Health (ToxOmics), Genetics, Oncology and Human Toxicology, Nova Medical School/Faculdade de Ciências Médicas, Universidade Nova de Lisboa, 1169-056 Lisboa, Portugal;
- Nephrology Department, Centro Hospitalar Universitário de Lisboa Central, 1069-166 Lisboa, Portugal
| | - Alexandra M. M. Antunes
- Centro de Química Estrutural, Institute of Molecular Sciences, Instituto Superior Técnico, 1049-001 Lisboa, Portugal;
| | - Manuel S. Almeida
- CEDOC, NOVA Medical School, Universidade Nova de Lisboa, 1169-056 Lisboa, Portugal; (M.J.C.); (A.B.P.); (J.M.); (C.O.S.); (M.S.A.); (P.B.); (E.C.M.); (J.S.)
- Hospital de Santa Cruz, Centro Hospitalar de Lisboa Ocidental, 2790-134 Carnaxide, Portugal
| | - Patrícia Branco
- CEDOC, NOVA Medical School, Universidade Nova de Lisboa, 1169-056 Lisboa, Portugal; (M.J.C.); (A.B.P.); (J.M.); (C.O.S.); (M.S.A.); (P.B.); (E.C.M.); (J.S.)
- Hospital de Santa Cruz, Centro Hospitalar de Lisboa Ocidental, 2790-134 Carnaxide, Portugal
| | - Emília C. Monteiro
- CEDOC, NOVA Medical School, Universidade Nova de Lisboa, 1169-056 Lisboa, Portugal; (M.J.C.); (A.B.P.); (J.M.); (C.O.S.); (M.S.A.); (P.B.); (E.C.M.); (J.S.)
| | - João B. Vicente
- Instituto de Tecnologia Química e Biológica António Xavier (ITQB NOVA), 2780-157 Oeiras, Portugal; (D.G.F.F.); (J.B.V.)
| | - Jacinta Serpa
- CEDOC, NOVA Medical School, Universidade Nova de Lisboa, 1169-056 Lisboa, Portugal; (M.J.C.); (A.B.P.); (J.M.); (C.O.S.); (M.S.A.); (P.B.); (E.C.M.); (J.S.)
- Instituto Português de Oncologia de Lisboa Francisco Gentil (IPOLFG), 1099-023 Lisboa, Portugal
| | - Sofia A. Pereira
- CEDOC, NOVA Medical School, Universidade Nova de Lisboa, 1169-056 Lisboa, Portugal; (M.J.C.); (A.B.P.); (J.M.); (C.O.S.); (M.S.A.); (P.B.); (E.C.M.); (J.S.)
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Omorou M, Liu N, Huang Y, Al-Ward H, Gao M, Mu C, Zhang L, Hui X. Cystathionine beta-Synthase in hypoxia and ischemia/reperfusion: A current overview. Arch Biochem Biophys 2022; 718:109149. [DOI: 10.1016/j.abb.2022.109149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 02/04/2022] [Accepted: 02/07/2022] [Indexed: 11/02/2022]
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Berry T, Abohamza E, Moustafa AA. Treatment-resistant schizophrenia: focus on the transsulfuration pathway. Rev Neurosci 2021; 31:219-232. [PMID: 31714892 DOI: 10.1515/revneuro-2019-0057] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Accepted: 07/19/2019] [Indexed: 12/12/2022]
Abstract
Treatment-resistant schizophrenia (TRS) is a severe form of schizophrenia. The severity of illness is positively related to homocysteine levels, with high homocysteine levels due to the low activity of the transsulfuration pathway, which metabolizes homocysteine in synthesizing L-cysteine. Glutathione levels are low in schizophrenia, which indicates shortages of L-cysteine and low activity of the transsulfuration pathway. Hydrogen sulfide (H2S) levels are low in schizophrenia. H2S is synthesized by cystathionine β-synthase and cystathionine γ-lyase, which are the two enzymes in the transsulfuration pathway. Iron-sulfur proteins obtain sulfur from L-cysteine. The oxidative phosphorylation (OXPHOS) pathway has various iron-sulfur proteins. With low levels of L-cysteine, iron-sulfur cluster formation will be dysregulated leading to deficits in OXPHOS in schizophrenia. Molybdenum cofactor (MoCo) synthesis requires sulfur, which is obtained from L-cysteine. With low levels of MoCo synthesis, molybdenum-dependent sulfite oxidase (SUOX) will not be synthesized at appropriate levels. SUOX detoxifies sulfite from sulfur-containing amino acids. If sulfites are not detoxified, there can be sulfite toxicity. The transsulfuration pathway metabolizes selenomethionine, whereby selenium from selenomethionine can be used for selenoprotein synthesis. The low activity of the transsulfuration pathway decreases selenoprotein synthesis. Glutathione peroxidase (GPX), with various GPXs being selenoprotein, is low in schizophrenia. The dysregulations of selenoproteins would lead to oxidant stress, which would increase the methylation of genes and histones leading to epigenetic changes in TRS. An add-on treatment to mainline antipsychotics is proposed for TRS that targets the dysregulations of the transsulfuration pathway and the dysregulations of other pathways stemming from the transsulfuration pathway being dysregulated.
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Affiliation(s)
- Thomas Berry
- School of Social Sciences and Psychology, Western Sydney University, Sydney 2751, New South Wales, Australia
| | - Eid Abohamza
- Department of Social Sciences, College of Arts and Sciences, Qatar University, P.O. Box 2713, Doha, Qatar
| | - Ahmed A Moustafa
- School of Social Sciences and Psychology, Western Sydney University, Sydney 2751, New South Wales, Australia.,Marcs Institute for Brain and Behaviour, Western Sydney University, Sydney 2751, New South Wales, Australia
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Long-term effect of parental selenium supplementation on the one-carbon metabolism in rainbow trout ( Oncorhynchus mykiss) fry exposed to hypoxic stress. Br J Nutr 2021; 127:23-34. [PMID: 33658100 DOI: 10.1017/s000711452100074x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
This study evaluated how different forms of selenium (Se) supplementation into rainbow trout broodstock diets modified the one-carbon metabolism of the progeny after the beginning of exogenous feeding and followed by hypoxia challenge. The progeny of three groups of rainbow trout broodstock fed either a control diet (Se level: 0·3 µg/g) or a diet supplemented with inorganic sodium selenite (Se level: 0·6 µg/g) or organic hydroxy-selenomethionine (Se level: 0·6 µg/g) was cross-fed with diets of similar Se composition for 11 weeks. Offspring were sampled either before or after being subjected to an acute hypoxic stress (1·7 mg/l dissolved oxygen) for 30 min. In normoxic fry, parental Se supplementation allowed higher glutathione levels compared with fry originating from parents fed the control diet. Parental hydroxy-selenomethionine treatment also increased cysteine and cysteinyl-glycine concentrations in fry. Dietary Se supplementation decreased glutamate-cysteine ligase (cgl) mRNA levels. Hydroxy-selenomethionine feeding also lowered the levels of some essential free amino acids in muscle tissue. Supplementation of organic Se to parents and fry reduced betaine-homocysteine S-methyltransferase (bhmt) expression in fry. The hypoxic stress decreased whole-body homocysteine, cysteine, cysteinyl-glycine and glutathione levels. Together with the higher mRNA levels of cystathionine beta-synthase (cbs), a transsulphuration enzyme, this suggests that under hypoxia, glutathione synthesis through transsulphuration might have been impaired by depletion of a glutathione precursor. In stressed fry, S-adenosylmethionine levels were significantly decreased, but S-adenosylhomocysteine remained stable. Decreased bhmt and adenosylmethionine decarboxylase 1a (amd1a) mRNA levels in stressed fry suggest a nutritional programming by parental Se also on methionine metabolism of rainbow trout.
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Burgess K, Bennett C, Mosnier H, Kwatra N, Bethel F, Jadavji NM. The Antioxidant Role of One-Carbon Metabolism on Stroke. Antioxidants (Basel) 2020; 9:E1141. [PMID: 33212887 PMCID: PMC7698340 DOI: 10.3390/antiox9111141] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Revised: 11/09/2020] [Accepted: 11/10/2020] [Indexed: 02/07/2023] Open
Abstract
One-carbon (1C) metabolism is a metabolic network that is centered on folate, a B vitamin; it integrates nutritional signals with biosynthesis, redox homeostasis, and epigenetics. This metabolic pathway also reduces levels of homocysteine, a non-protein amino acid. High levels of homocysteine are linked to increased risk of hypoxic events, such as stroke. Several preclinical studies have suggested that 1C metabolism can impact stroke outcome, but the clinical data are unclear. The objective of this paper was to review preclinical and clinical research to determine whether 1C metabolism has an antioxidant role on stroke. To accomplish the objective, we searched for publications using the following medical subject headings (MeSH) keywords: antioxidants, hypoxia, stroke, homocysteine, one-carbon metabolism, folate, methionine, and dietary supplementation of one-carbon metabolism. Both pre-clinical and clinical studies were retrieved and reviewed. Our review of the literature suggests that deficiencies in 1C play an important role in the onset and outcome of stroke. Dietary supplementation of 1C provides beneficial effects on stroke outcome. For stroke-affected patients or individuals at high risk for stroke, the data suggest that nutritional modifications in addition to other therapies could be incorporated into a treatment plan.
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Affiliation(s)
- Kassidy Burgess
- College of Veterinary Medicine, Midwestern University, Glendale, AZ 85308, USA;
- Biomedical Sciences Program, Midwestern University, Glendale, AZ 85308, USA; (C.B.); (N.K.); (F.B.)
| | - Calli Bennett
- Biomedical Sciences Program, Midwestern University, Glendale, AZ 85308, USA; (C.B.); (N.K.); (F.B.)
- College of Osteopathic Medicine, Midwestern University, Glendale, AZ 85308, USA
| | - Hannah Mosnier
- School of Medicine, National University of Ireland Galway, H91 TK33, Ireland;
- College of Dental Medicine, Midwestern University, Glendale, AZ 85308, USA
| | - Neha Kwatra
- Biomedical Sciences Program, Midwestern University, Glendale, AZ 85308, USA; (C.B.); (N.K.); (F.B.)
- College of Dental Medicine, Midwestern University, Glendale, AZ 85308, USA
| | - Forrest Bethel
- Biomedical Sciences Program, Midwestern University, Glendale, AZ 85308, USA; (C.B.); (N.K.); (F.B.)
- College of Osteopathic Medicine, Midwestern University, Glendale, AZ 85308, USA
| | - Nafisa M. Jadavji
- College of Veterinary Medicine, Midwestern University, Glendale, AZ 85308, USA;
- Biomedical Sciences Program, Midwestern University, Glendale, AZ 85308, USA; (C.B.); (N.K.); (F.B.)
- Department of Neuroscience, Carleton University, Ottawa, ON K1S 5B6, Canada
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The multifaceted roles of sulfane sulfur species in cancer-associated processes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2020; 1862:148338. [PMID: 33212042 DOI: 10.1016/j.bbabio.2020.148338] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 10/30/2020] [Accepted: 11/13/2020] [Indexed: 02/07/2023]
Abstract
Sulfane sulfur species comprise a variety of biologically relevant hydrogen sulfide (H2S)-derived species, including per- and poly-sulfidated low molecular weight compounds and proteins. A growing body of evidence suggests that H2S, currently recognized as a key signaling molecule in human physiology and pathophysiology, plays an important role in cancer biology by modulating cell bioenergetics and contributing to metabolic reprogramming. This is accomplished through functional modulation of target proteins via H2S binding to heme iron centers or H2S-mediated reversible per- or poly-sulfidation of specific cysteine residues. Since sulfane sulfur species are increasingly viewed not only as a major source of H2S but also as key mediators of some of the biological effects commonly attributed to H2S, the multifaceted role of these species in cancer biology is reviewed here with reference to H2S, focusing on their metabolism, signaling function, impact on cell bioenergetics and anti-tumoral properties.
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Eleftheriadis T, Pissas G, Nikolaou E, Filippidis G, Liakopoulos V, Stefanidis I. Mistimed H 2S upregulation, Nrf2 activation and antioxidant proteins levels in renal tubular epithelial cells subjected to anoxia and reoxygenation. Biomed Rep 2020; 13:3. [PMID: 32509306 DOI: 10.3892/br.2020.1309] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 04/08/2020] [Indexed: 12/28/2022] Open
Abstract
Ischemia-reperfusion (I-R) injury is involved in the pathogenesis of several human diseases. In the present study, the kinetics of the H2S producing enzymes-nuclear factor erythroid 2-like 2 (Nrf2)-antioxidant proteins axis under anoxia or reoxygenation was evaluated, as well as its effects on survival of mouse renal proximal tubular epithelial cells (RPTECs). In RPTECs subjected to anoxia and subsequent reoxygenation, reactive oxygen species (ROS) production, lipid peroxidation, ferroptotic cell death, the levels of the H2S producing enzymes and H2S, the expression of Nrf2 and its transcriptional targets superoxide dismutase-3, glutathione reductase, ferritin H and cystine-glutamate antiporter, as well as apoptosis, and the levels of p53, Bax and phosphorylated p53 were assessed. When needed, the H2S producing enzyme inhibitor aminooxyacetate, or the ferroptosis inhibitor α-tocopherol, were used. Reoxygenation induced ferroptosis, whereas anoxia activated the p53-Bax pathway and induced apoptosis. The H2S producing enzymes-Nrf2-antioxidant proteins axis was activated only during anoxia and not during reoxygenation, when cellular viability is threatened by ROS overproduction and the ensuing ferroptosis. The activation of the above axis during anoxia ameliorated the effects of the apoptotic p53-Bax pathway, but did not adequately protect against apoptosis. In conclusion, the H2S-Nrf2 axis is activated by anoxia, and although it reduces apoptosis, it does not completely prevent apoptotic cell death. Additionally, following reoxygenation, the above axis was not activated. This mistimed activation of the H2S producing enzymes-Nrf2-antioxidant proteins axis contributes to reoxygenation-induced cell death. Determining the exact molecular mechanisms involved in reoxygenation-induced cell death may assist in the development of clinically relevant interventions for preventing I-R injury.
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Affiliation(s)
- Theodoros Eleftheriadis
- Department of Nephrology, Faculty of Medicine, University of Thessaly, Biopolis, Mezourlo Hill, 41110 Larissa, Greece
| | - Georgios Pissas
- Department of Nephrology, Faculty of Medicine, University of Thessaly, Biopolis, Mezourlo Hill, 41110 Larissa, Greece
| | - Evdokia Nikolaou
- Department of Nephrology, Faculty of Medicine, University of Thessaly, Biopolis, Mezourlo Hill, 41110 Larissa, Greece
| | - Georgios Filippidis
- Department of Nephrology, Faculty of Medicine, University of Thessaly, Biopolis, Mezourlo Hill, 41110 Larissa, Greece
| | - Vassilios Liakopoulos
- Department of Nephrology, Faculty of Medicine, University of Thessaly, Biopolis, Mezourlo Hill, 41110 Larissa, Greece
| | - Ioannis Stefanidis
- Department of Nephrology, Faculty of Medicine, University of Thessaly, Biopolis, Mezourlo Hill, 41110 Larissa, Greece
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Zuhra K, Augsburger F, Majtan T, Szabo C. Cystathionine-β-Synthase: Molecular Regulation and Pharmacological Inhibition. Biomolecules 2020; 10:E697. [PMID: 32365821 PMCID: PMC7277093 DOI: 10.3390/biom10050697] [Citation(s) in RCA: 105] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 04/24/2020] [Accepted: 04/27/2020] [Indexed: 12/11/2022] Open
Abstract
Cystathionine-β-synthase (CBS), the first (and rate-limiting) enzyme in the transsulfuration pathway, is an important mammalian enzyme in health and disease. Its biochemical functions under physiological conditions include the metabolism of homocysteine (a cytotoxic molecule and cardiovascular risk factor) and the generation of hydrogen sulfide (H2S), a gaseous biological mediator with multiple regulatory roles in the vascular, nervous, and immune system. CBS is up-regulated in several diseases, including Down syndrome and many forms of cancer; in these conditions, the preclinical data indicate that inhibition or inactivation of CBS exerts beneficial effects. This article overviews the current information on the expression, tissue distribution, physiological roles, and biochemistry of CBS, followed by a comprehensive overview of direct and indirect approaches to inhibit the enzyme. Among the small-molecule CBS inhibitors, the review highlights the specificity and selectivity problems related to many of the commonly used "CBS inhibitors" (e.g., aminooxyacetic acid) and provides a comprehensive review of their pharmacological actions under physiological conditions and in various disease models.
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Affiliation(s)
- Karim Zuhra
- Chair of Pharmacology, Section of Medicine, University of Fribourg, 1702 Fribourg, Switzerland; (K.Z.); (F.A.)
| | - Fiona Augsburger
- Chair of Pharmacology, Section of Medicine, University of Fribourg, 1702 Fribourg, Switzerland; (K.Z.); (F.A.)
| | - Tomas Majtan
- Department of Pediatrics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA;
| | - Csaba Szabo
- Chair of Pharmacology, Section of Medicine, University of Fribourg, 1702 Fribourg, Switzerland; (K.Z.); (F.A.)
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15
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Berry T, Abohamza E, Moustafa AA. A disease-modifying treatment for Alzheimer's disease: focus on the trans-sulfuration pathway. Rev Neurosci 2020; 31:319-334. [PMID: 31751299 DOI: 10.1515/revneuro-2019-0076] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 08/31/2019] [Indexed: 12/16/2022]
Abstract
High homocysteine levels in Alzheimer's disease (AD) result from low activity of the trans-sulfuration pathway. Glutathione levels are also low in AD. L-cysteine is required for the synthesis of glutathione. The synthesis of coenzyme A (CoA) requires L-cysteine, which is synthesized via the trans-sulfuration pathway. CoA is required for the synthesis of acetylcholine and appropriate cholinergic neurotransmission. L-cysteine is required for the synthesis of molybdenum-containing proteins. Sulfite oxidase (SUOX), which is a molybdenum-containing protein, could be dysregulated in AD. SUOX detoxifies the sulfites. Glutaminergic neurotransmission could be dysregulated in AD due to low levels of SUOX and high levels of sulfites. L-cysteine provides sulfur for iron-sulfur clusters. Oxidative phosphorylation (OXPHOS) is heavily dependent on iron-sulfur proteins. The decrease in OXPHOS seen in AD could be due to dysregulations of the trans-sulfuration pathway. There is a decrease in aconitase 1 (ACO1) in AD. ACO1 is an iron-sulfur enzyme in the citric acid cycle that upon loss of an iron-sulfur cluster converts to iron regulatory protein 1 (IRP1). With the dysregulation of iron-sulfur cluster formation ACO1 will convert to IRP1 which will decrease the 2-oxglutarate synthesis dysregulating the citric acid cycle and also dysregulating iron metabolism. Selenomethionine is also metabolized by the trans-sulfuration pathway. With the low activity of the trans-sulfuration pathway in AD selenoproteins will be dysregulated in AD. Dysregulation of selenoproteins could lead to oxidant stress in AD. In this article, we propose a novel treatment for AD that addresses dysregulations resulting from low activity of the trans-sulfuration pathway and low L-cysteine.
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Affiliation(s)
- Thomas Berry
- School of Social Sciences and Psychology, Western Sydney University, 2 Bullecourt Ave, Milperra, 2214 Sydney, New South Wales, Australia
| | - Eid Abohamza
- Department of Social Sciences, College of Arts and Sciences, Qatar University, Doha, Qatar
| | - Ahmed A Moustafa
- School of Social Sciences and Psychology, Western Sydney University, 2 Bullecourt Ave, Milperra, 2214 Sydney, New South Wales, Australia
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Cysteine becomes conditionally essential during hypobaric hypoxia and regulates adaptive neuro-physiological responses through CBS/H 2S pathway. Biochim Biophys Acta Mol Basis Dis 2020; 1866:165769. [PMID: 32184133 DOI: 10.1016/j.bbadis.2020.165769] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 02/02/2020] [Accepted: 03/12/2020] [Indexed: 12/17/2022]
Abstract
Brain is well known for its disproportionate oxygen consumption and high energy-budget for optimal functioning. The decrease in oxygen supply to brain, thus, necessitates rapid activation of adaptive pathways - the absence of which manifest into vivid pathological conditions. Amongst these, oxygen sensing in glio-vascular milieu and H2S-dependent compensatory increase in cerebral blood flow (CBF) is a major adaptive response. We had recently demonstrated that the levels of H2S were significantly decreased during chronic hypobaric hypoxia (HH)-induced neuro-pathological effects. The mechanistic basis of this phenomenon, however, remained to be deciphered. We, here, describe experimental evidence for marked limitation of cysteine during HH - both in animal model as well as human volunteers ascending to high altitude. We show that the preservation of brain cysteine level, employing cysteine pro-drug (N-acetyl-L-cysteine, NAC), markedly curtailed effects of HH - not only on endogenous H2S levels but also, impairment of spatial reference memory in our animal model. We, further, present multiple lines of experimental evidence that the limitation of cysteine was causally governed by physiological propensity of brain to utilize cysteine, in cystathionine beta synthase (CBS)-dependent manner, past its endogenous replenishment potential. Notably, decrease in the levels of brain cysteine manifested despite positive effect (up-regulation) of HH on endogenous cysteine maintenance pathways and thus, qualifying cysteine as a conditionally essential nutrient (CEN) during HH. In brief, our data supports an adaptive, physiological role of CBS-mediated cysteine-utilization pathway - activated to increase endogenous levels of H2S - for optimal responses of brain to hypobaric hypoxia.
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17
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Giuffrè A, Tomé CS, Fernandes DGF, Zuhra K, Vicente JB. Hydrogen Sulfide Metabolism and Signaling in the Tumor Microenvironment. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020; 1219:335-353. [PMID: 32130707 DOI: 10.1007/978-3-030-34025-4_17] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Hydrogen sulfide (H2S), while historically perceived merely as a toxicant, has progressively emerged as a key regulator of numerous processes in mammalian physiology, exerting its signaling function essentially through interaction with and/or modification of proteins, targeting mainly cysteine residues and metal centers. As a gaseous signaling molecule that freely diffuses across aqueous and hydrophobic biological milieu, it has been designated the third 'gasotransmitter' in mammalian physiology. H2S is synthesized and detoxified by specialized endogenous enzymes that operate under a tight regulation, ensuring homeostatic levels of this otherwise toxic molecule. Indeed, imbalances in H2S levels associated with dysfunctional H2S metabolism have been growingly correlated with various human pathologies, from cardiovascular and neurodegenerative diseases to cancer. Several cancer cell lines and specimens have been shown to naturally overexpress one or more of the H2S-synthesizing enzymes. The resulting increased H2S levels have been proposed to promote cancer development through the regulation of various cancer-related processes, which led to the interest in pharmacological targeting of H2S metabolism. Herein are summarized some of the key observations that place H2S metabolism and signaling pathways at the forefront of the cellular mechanisms that support the establishment and development of a tumor within its complex and challenging microenvironment. Special emphasis is given to the mechanisms whereby H2S helps shaping cancer cell bioenergetic metabolism and affords resistance and adaptive mechanisms to hypoxia.
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Affiliation(s)
| | - Catarina S Tomé
- Instituto de Tecnologia Química e Biológica António Xavier, NOVA University of Lisbon, Oeiras, Portugal
| | - Dalila G F Fernandes
- Instituto de Tecnologia Química e Biológica António Xavier, NOVA University of Lisbon, Oeiras, Portugal
| | - Karim Zuhra
- CNR Institute of Molecular Biology and Pathology, Rome, Italy
- Department of Biochemical Sciences, Sapienza University of Rome, Rome, Italy
| | - João B Vicente
- Instituto de Tecnologia Química e Biológica António Xavier, NOVA University of Lisbon, Oeiras, Portugal.
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18
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Hydrogen Sulfide: Emerging Role in Bladder, Kidney, and Prostate Malignancies. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:2360945. [PMID: 31781328 PMCID: PMC6875223 DOI: 10.1155/2019/2360945] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 07/22/2019] [Accepted: 09/30/2019] [Indexed: 12/23/2022]
Abstract
Hydrogen sulfide (H2S) is the latest member of the gasotransmitter family and known to play essential roles in cancer pathophysiology. H2S is produced endogenously and can be administered exogenously. Recent studies showed that H2S in cancers has both pro- and antitumor roles. Understanding the difference in the expression and localization of tissue-specific H2S-producing enzymes in healthy and cancer tissues allows us to develop tools for cancer diagnosis and treatment. Urological malignancies are some of the most common cancers in both men and women, and their early detection is vital since advanced cancers are recurrent, metastatic, and often resistant to treatment. This review summarizes the roles of H2S in cancer and looks at current studies investigating H2S activity and expression of H2S-producing enzymes in urinary cancers. We specifically focused on urothelial carcinoma, renal cell carcinoma, and prostate cancer, as they form the majority of newly diagnosed urinary cancers. Recent studies show that besides the physiological activity of H2S in cancer cells, there are patterns between the development and prognosis of urinary cancers and the expression of H2S-producing enzymes and indirectly the H2S levels. Though controversial and not completely understood, studying the expression of H2S-producing enzymes in cancer tissue may represent an avenue for novel diagnostic and therapeutic strategies for addressing urological malignancies.
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19
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Hydrogen Sulfide Oxidation: Adaptive Changes in Mitochondria of SW480 Colorectal Cancer Cells upon Exposure to Hypoxia. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:8102936. [PMID: 30838088 PMCID: PMC6374825 DOI: 10.1155/2019/8102936] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Accepted: 12/10/2018] [Indexed: 02/06/2023]
Abstract
Hydrogen sulfide (H2S), a known inhibitor of cytochrome c oxidase (CcOX), plays a key signaling role in human (patho)physiology. H2S is synthesized endogenously and mainly metabolized by a mitochondrial sulfide-oxidizing pathway including sulfide:quinone oxidoreductase (SQR), whereby H2S-derived electrons are injected into the respiratory chain stimulating O2 consumption and ATP synthesis. Under hypoxic conditions, H2S has higher stability and is synthesized at higher levels with protective effects for the cell. Herein, working on SW480 colon cancer cells, we evaluated the effect of hypoxia on the ability of cells to metabolize H2S. The sulfide-oxidizing activity was assessed by high-resolution respirometry, measuring the stimulatory effect of sulfide on rotenone-inhibited cell respiration in the absence or presence of antimycin A. Compared to cells grown under normoxic conditions (air O2), cells exposed for 24 h to hypoxia (1% O2) displayed a 1.3-fold reduction in maximal sulfide-oxidizing activity and 2.7-fold lower basal O2 respiration. Based on citrate synthase activity assays, mitochondria of hypoxia-treated cells were 1.8-fold less abundant and displayed 1.4-fold higher maximal sulfide-oxidizing activity and 2.6-fold enrichment in SQR as evaluated by immunoblotting. We speculate that under hypoxic conditions mitochondria undergo these adaptive changes to protect cell respiration from H2S poisoning.
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20
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Grambow E, Augustin VA, Strüder D, Kundt G, Klar E, Vollmar B. The effects of hydrogen sulfide on microvascular circulation in the axial pattern flap ear model in hairless mice. Microvasc Res 2018; 120:74-83. [PMID: 29991448 DOI: 10.1016/j.mvr.2018.06.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Revised: 06/27/2018] [Accepted: 06/27/2018] [Indexed: 01/30/2023]
Affiliation(s)
- Eberhard Grambow
- Institute for Experimental Surgery, University Medical Center Rostock, Rostock, Germany; Department for General, Thoracic-, Vascular- and Transplantation Surgery, University Medical Center Rostock, Rostock, Germany.
| | - Vicky A Augustin
- Institute for Experimental Surgery, University Medical Center Rostock, Rostock, Germany
| | - Daniel Strüder
- Institute for Experimental Surgery, University Medical Center Rostock, Rostock, Germany; Department of Otorhinolaryngology, Head and Neck Surgery, Rostock University Medical Center, Rostock, Germany
| | - Günther Kundt
- Institute for Biostatistics and Informatics in Medicine and Ageing Research, Rostock University Medical Center, Rostock, Germany
| | - Ernst Klar
- Department for General, Thoracic-, Vascular- and Transplantation Surgery, University Medical Center Rostock, Rostock, Germany
| | - Brigitte Vollmar
- Institute for Experimental Surgery, University Medical Center Rostock, Rostock, Germany
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21
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Cystathionine β-Synthase in Physiology and Cancer. BIOMED RESEARCH INTERNATIONAL 2018; 2018:3205125. [PMID: 30050925 PMCID: PMC6046153 DOI: 10.1155/2018/3205125] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Accepted: 05/29/2018] [Indexed: 01/20/2023]
Abstract
Cystathionine β-synthase (CBS) regulates homocysteine metabolism and contributes to hydrogen sulfide (H2S) biosynthesis through which it plays multifunctional roles in the regulation of cellular energetics, redox status, DNA methylation, and protein modification. Inactivating mutations in CBS contribute to the pathogenesis of the autosomal recessive disease CBS-deficient homocystinuria. Recent studies demonstrating that CBS promotes colon and ovarian cancer growth in preclinical models highlight a newly identified oncogenic role for CBS. On the contrary, tumor-suppressive effects of CBS have been reported in other cancer types, suggesting context-dependent roles of CBS in tumor growth and progression. Here, we review the physiological functions of CBS, summarize the complexities regarding CBS research in oncology, and discuss the potential of CBS and its key metabolites, including homocysteine and H2S, as potential biomarkers for cancer diagnosis or therapeutic targets for cancer treatment.
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22
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Hydrogen sulfide as a regulatory factor in kidney health and disease. Biochem Pharmacol 2018; 149:29-41. [DOI: 10.1016/j.bcp.2017.12.005] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Accepted: 12/05/2017] [Indexed: 12/19/2022]
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23
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O’Connor LJ, Mistry IN, Collins SL, Folkes LK, Brown G, Conway SJ, Hammond EM. CYP450 Enzymes Effect Oxygen-Dependent Reduction of Azide-Based Fluorogenic Dyes. ACS CENTRAL SCIENCE 2017; 3:20-30. [PMID: 28149949 PMCID: PMC5269656 DOI: 10.1021/acscentsci.6b00276] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Indexed: 05/06/2023]
Abstract
Azide-containing compounds have broad utility in organic synthesis and chemical biology. Their use as powerful tools for the labeling of biological systems in vitro has enabled insights into complex cellular functions. To date, fluorogenic azide-containing compounds have primarily been employed in the context of click chemistry and as sensitive functionalities for hydrogen sulfide detection. Here, we report an alternative use of this functionality: as fluorogenic probes for the detection of depleted oxygen levels (hypoxia). Oxygen is imperative to all life forms, and probes that enable quantification of oxygen tension are of high utility in many areas of biology. Here we demonstrate the ability of an azide-based dye to image hypoxia in a range of human cancer cell lines. We have found that cytochrome P450 enzymes are able to reduce these probes in an oxygen-dependent manner, while hydrogen sulfide does not play an important role in their reduction. These data indicate that the azide group is a new bioreductive functionality that can be employed in prodrugs and dyes. We have uncovered a novel mechanism for the cellular reduction of azides, which has implications for the use of click chemistry in hypoxia.
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Affiliation(s)
- Liam J. O’Connor
- Department of Chemistry,
Chemistry Research Laboratory, University
of Oxford, Mansfield
Road, Oxford, OX1 3TA, U.K.
- CRUK/MRC Oxford Institute for Radiation
Oncology, Department of Oncology, University
of Oxford, Old Road Campus
Research Building, Oxford, OX3 7DQ, U.K.
| | - Ishna N. Mistry
- CRUK/MRC Oxford Institute for Radiation
Oncology, Department of Oncology, University
of Oxford, Old Road Campus
Research Building, Oxford, OX3 7DQ, U.K.
| | - Sarah L. Collins
- Department of Chemistry,
Chemistry Research Laboratory, University
of Oxford, Mansfield
Road, Oxford, OX1 3TA, U.K.
| | - Lisa K. Folkes
- CRUK/MRC Oxford Institute for Radiation
Oncology, Department of Oncology, University
of Oxford, Old Road Campus
Research Building, Oxford, OX3 7DQ, U.K.
| | - Graham Brown
- CRUK/MRC Oxford Institute for Radiation
Oncology, Department of Oncology, University
of Oxford, Old Road Campus
Research Building, Oxford, OX3 7DQ, U.K.
| | - Stuart J. Conway
- Department of Chemistry,
Chemistry Research Laboratory, University
of Oxford, Mansfield
Road, Oxford, OX1 3TA, U.K.
| | - Ester M. Hammond
- CRUK/MRC Oxford Institute for Radiation
Oncology, Department of Oncology, University
of Oxford, Old Road Campus
Research Building, Oxford, OX3 7DQ, U.K.
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24
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Yuan S, Kevil CG. Nitric Oxide and Hydrogen Sulfide Regulation of Ischemic Vascular Remodeling. Microcirculation 2016; 23:134-45. [PMID: 26381654 DOI: 10.1111/micc.12248] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2015] [Accepted: 09/13/2015] [Indexed: 12/22/2022]
Abstract
Blockage or restriction of blood flow through conduit arteries results in tissue ischemia downstream of the disturbed area. Local tissues can adapt to this challenge by stimulating vascular remodeling through angiogenesis and arteriogenesis thereby restoring blood perfusion and removal of wastes. Multiple molecular mechanisms of vascular remodeling during ischemia have been identified and extensively studied. However, therapeutic benefits from these findings and insights are limited due to the complexity of various signaling networks and a lack of understanding central metabolic regulators governing these responses. The gasotransmitters NO and H2 S have emerged as master regulators that influence multiple molecular targets necessary for ischemic vascular remodeling. In this review, we discuss how NO and H2 S are individually regulated under ischemia, what their roles are in angiogenesis and arteriogenesis, and how their interaction controls ischemic vascular remodeling.
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Affiliation(s)
- Shuai Yuan
- Departments of Pathology, Molecular and Cellular Physiology, and Cell Biology and Anatomy, LSU Health Shreveport, Shreveport, Louisiana, USA
| | - Christopher G Kevil
- Departments of Pathology, Molecular and Cellular Physiology, and Cell Biology and Anatomy, LSU Health Shreveport, Shreveport, Louisiana, USA
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25
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Katsouda A, Bibli SI, Pyriochou A, Szabo C, Papapetropoulos A. Regulation and role of endogenously produced hydrogen sulfide in angiogenesis. Pharmacol Res 2016; 113:175-185. [PMID: 27569706 DOI: 10.1016/j.phrs.2016.08.026] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Revised: 08/05/2016] [Accepted: 08/24/2016] [Indexed: 01/16/2023]
Abstract
Recent studies have implicated endogenously produced H2S in the angiogenic process. On one hand, pharmacological inhibition and silencing of the enzymes involved in H2S synthesis attenuate the angiogenic properties of endothelial cells, including proliferation, migration and tube-like structure network formation. On the other hand, enhanced production of H2S by substrate supplementation or over-expression of H2S-producing enzymes leads to enhanced angiogenic responses in cultured endothelial cells. Importantly, H2S up-regulates expression of the key angiogenic factor vascular endothelial growth factor (VEGF) and contributes to the angiogenic signaling in response to VEGF. The signaling pathways mediating H2S-induced angiogenesis include mitogen-activated protein kinases, phosphoinositide-3 kinase, nitric oxide/cGMP-regulated cascades and ATP-sensitive potassium channels. Endogenously produced H2S has also been shown to facilitate neovascularization in prototypical model systems in vivo, and to contribute to wound healing, post-ischemic angiogenesis in the heart and other tissues, as well as in tumor angiogenesis. Targeting of H2S synthesizing enzymes might offer novel therapeutic opportunities for angiogenesis-related diseases.
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Affiliation(s)
- Antonia Katsouda
- Laboratory of Pharmacology, Faculty of Pharmacy, National and Kapodistrian University of Athens, Greece, Greece; Center of Clinical, Experimental Surgery & Translational Research, Biomedical Research Foundation of the Academy of Athens, Greece
| | - Sofia-Iris Bibli
- Laboratory of Pharmacology, Faculty of Pharmacy, National and Kapodistrian University of Athens, Greece, Greece
| | - Anastasia Pyriochou
- Laboratory of Molecular Pharmacology, Department of Pharmacy, University of Patras, Greece
| | - Csaba Szabo
- Department of Anesthesiology, University of Texas Medical Branch, Galveston, TX, USA
| | - Andreas Papapetropoulos
- Laboratory of Pharmacology, Faculty of Pharmacy, National and Kapodistrian University of Athens, Greece, Greece; Center of Clinical, Experimental Surgery & Translational Research, Biomedical Research Foundation of the Academy of Athens, Greece.
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26
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Yuan G, Peng YJ, Khan SA, Nanduri J, Singh A, Vasavda C, Semenza GL, Kumar GK, Snyder SH, Prabhakar NR. H2S production by reactive oxygen species in the carotid body triggers hypertension in a rodent model of sleep apnea. Sci Signal 2016; 9:ra80. [PMID: 27531649 DOI: 10.1126/scisignal.aaf3204] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Sleep apnea is a prevalent respiratory disease in which episodic cessation of breathing causes intermittent hypoxia. Patients with sleep apnea and rodents exposed to intermittent hypoxia exhibit hypertension. The carotid body senses changes in blood O2 concentrations, and an enhanced carotid body chemosensory reflex contributes to hypertension in sleep apnea patients. A rodent model of intermittent hypoxia that mimics blood O2 saturation profiles of patients with sleep apnea has shown that increased generation of reactive oxygen species (ROS) in the carotid body enhances the chemosensory reflex and triggers hypertension. CO generated by heme oxygenase-2 (HO-2) induces a signaling pathway that inhibits hydrogen sulfide (H2S) production by cystathionine γ-lyase (CSE), leading to suppression of carotid body activity. We found that ROS inhibited CO generation by HO-2 in the carotid body and liver through a mechanism that required Cys(265) in the heme regulatory motif of heterologously expressed HO-2. We showed that ROS induced by intermittent hypoxia inhibited CO production and increased H2S concentrations in the carotid body, which stimulated its neural activity. In rodents, blockade of H2S synthesis by CSE, by either pharmacologic or genetic approaches, inhibited carotid body activation and hypertension induced by intermittent hypoxia. Thus, our results indicate that oxidant-induced inactivation of HO-2, which leads to increased CSE-dependent H2S production in the carotid body, is a critical trigger of hypertension in rodents exposed to intermittent hypoxia.
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Affiliation(s)
- Guoxiang Yuan
- Institute for Integrative Physiology and Center for Systems Biology for O2 Sensing, Biological Sciences Division, University of Chicago, Chicago, IL 60637, USA
| | - Ying-Jie Peng
- Institute for Integrative Physiology and Center for Systems Biology for O2 Sensing, Biological Sciences Division, University of Chicago, Chicago, IL 60637, USA
| | - Shakil A Khan
- Institute for Integrative Physiology and Center for Systems Biology for O2 Sensing, Biological Sciences Division, University of Chicago, Chicago, IL 60637, USA
| | - Jayasri Nanduri
- Institute for Integrative Physiology and Center for Systems Biology for O2 Sensing, Biological Sciences Division, University of Chicago, Chicago, IL 60637, USA
| | - Amritha Singh
- Institute for Integrative Physiology and Center for Systems Biology for O2 Sensing, Biological Sciences Division, University of Chicago, Chicago, IL 60637, USA
| | - Chirag Vasavda
- Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA. Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Gregg L Semenza
- Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA. Departments of Pediatrics, Medicine, Oncology, Radiation Oncology, and Biological Chemistry, and McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Ganesh K Kumar
- Institute for Integrative Physiology and Center for Systems Biology for O2 Sensing, Biological Sciences Division, University of Chicago, Chicago, IL 60637, USA
| | - Solomon H Snyder
- Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA. Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA. Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Nanduri R Prabhakar
- Institute for Integrative Physiology and Center for Systems Biology for O2 Sensing, Biological Sciences Division, University of Chicago, Chicago, IL 60637, USA.
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Leigh J, Saha MN, Mok A, Champsi O, Wang R, Lobb I, Sener A. Hydrogen Sulfide Induced Erythropoietin Synthesis is Regulated by HIF Proteins. J Urol 2016; 196:251-60. [PMID: 26880412 DOI: 10.1016/j.juro.2016.01.113] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/12/2016] [Indexed: 12/27/2022]
Abstract
PURPOSE Anemia of end stage renal disease affects 90% of patients on hemodialysis and it is a tremendous concern of patients and health care providers. Renal disease creates a state of renal hypoxia, which may contribute to a lack of erythropoietin production from the kidney when low oxygen levels are sensed. This necessitates the use of exogenous erythropoietin preparations. MATERIALS AND METHODS Recent evidence suggests that endogenously derived hydrogen sulfide may mediate oxygen sensing in tissues. Given the known involvement of other small molecules such as nitric oxide in erythropoietin production and the observation of decreased urinary H2S levels in patients with renal failure, we postulated that H2S may be the primary mediator of erythropoietin production during hypoxia. PK1, 786-O and Hep3B cells were incubated in hypoxia (1% O2) for 24 hours. Hypoxic cells were treated with the H2S donor GYY 4137 and the H2S inhibitor hydroxylamine. Following hypoxia erythropoietin, HIF-1α, HIF-2α and CBS expression was measured by quantitative real-time polymerase chain reaction and Western blot. RESULTS Hydroxylamine administration led to a significant decrease in erythropoietin, HIF-1α, HIF-2α and CBS protein levels during hypoxia. This was rescued by administration of GYY 4137 for erythropoietin, CBS and HIF-2α. Additionally, CSE -/- mice placed in hypoxia for 72 hours showed decreased renal erythropoietin production compared to wild-type mice. CONCLUSIONS These data suggest previously undocumented interplay of the production and action of H2S during hypoxia with subsequent erythropoietin production. The use of novel hydrogen sulfide donors could represent an alternative to standard therapies of anemia of renal failure.
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Affiliation(s)
- Jennifer Leigh
- Department of Microbiology and Immunology, Western University, London, Ontario, Canada; Matthew Mailing Centre for Translational Transplant Studies, London Health Sciences Centre, London, Ontario, Canada
| | - Manujendra N Saha
- Matthew Mailing Centre for Translational Transplant Studies, London Health Sciences Centre, London, Ontario, Canada
| | - Amy Mok
- Department of Microbiology and Immunology, Western University, London, Ontario, Canada; Matthew Mailing Centre for Translational Transplant Studies, London Health Sciences Centre, London, Ontario, Canada
| | - Omar Champsi
- Department of Microbiology and Immunology, Western University, London, Ontario, Canada; Matthew Mailing Centre for Translational Transplant Studies, London Health Sciences Centre, London, Ontario, Canada
| | - Rui Wang
- Cardiovascular and Metabolic Research Unit, Laurentian University, Sudbury, Ontario, Canada
| | - Ian Lobb
- Department of Microbiology and Immunology, Western University, London, Ontario, Canada; Matthew Mailing Centre for Translational Transplant Studies, London Health Sciences Centre, London, Ontario, Canada
| | - Alp Sener
- Department of Surgery, Western University, London, Ontario, Canada; Multi-Organ Transplant Program, London Health Sciences Centre, London, Ontario, Canada.
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Huang CW, Moore PK. H2S Synthesizing Enzymes: Biochemistry and Molecular Aspects. Handb Exp Pharmacol 2015; 230:3-25. [PMID: 26162827 DOI: 10.1007/978-3-319-18144-8_1] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Hydrogen sulfide (H2S) is a biologically active gas that is synthesized naturally by three enzymes, cystathionine γ-lyase (CSE), cystathionine β-synthetase (CBS) and 3-mercaptopyruvate sulfurtransferase (3-MST). These enzymes are constitutively present in a wide array of biological cells and tissues and their expression can be induced by a number of disease states. It is becoming increasingly clear that H2S is an important mediator of a wide range of cell functions in health and in disease. This review therefore provides an overview of the biochemical and molecular regulation of H2S synthesizing enzymes both in physiological conditions and their modulation in disease states with particular focus on their regulation in asthma, atherosclerosis and diabetes. The importance of small molecule inhibitors in the study of molecular pathways, the current use of common H2S synthesizing enzyme inhibitors and the relevant characteristics of mice in which these enzymes have been genetically deleted will also be summarized. With a greater understanding of the molecular regulation of these enzymes in disease states, as well as the availability of novel small molecules with high specificity targeted towards H2S producing enzymes, the potential to regulate the biological functions of this intriguing gas H2S for therapeutic effect can perhaps be brought one step closer.
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Affiliation(s)
- Caleb Weihao Huang
- Neurobiology Group, Life Sciences Institute and Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
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Inhibition of endogenous hydrogen sulfide production in clear-cell renal cell carcinoma cell lines and xenografts restricts their growth, survival and angiogenic potential. Nitric Oxide 2015; 49:26-39. [PMID: 26068241 DOI: 10.1016/j.niox.2015.06.001] [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: 09/30/2014] [Revised: 05/20/2015] [Accepted: 06/01/2015] [Indexed: 11/21/2022]
Abstract
Clear cell renal cell carcinoma (ccRCC) is characterized by Von Hippel-Lindau (VHL)-deficiency, resulting in pseudohypoxic, angiogenic and glycolytic tumours. Hydrogen sulfide (H2S) is an endogenously-produced gasotransmitter that accumulates under hypoxia and has been shown to be pro-angiogenic and cytoprotective in cancer. It was hypothesized that H2S levels are elevated in VHL-deficient ccRCC, contributing to survival, metabolism and angiogenesis. Using the H2S-specific probe MeRhoAz, it was found that H2S levels were higher in VHL-deficient ccRCC cell lines compared to cells with wild-type VHL. Inhibition of H2S-producing enzymes could reduce the proliferation, metabolism and survival of ccRCC cell lines, as determined by live-cell imaging, XTT/ATP assay, and flow cytometry respectively. Using the chorioallantoic membrane angiogenesis model, it was found that systemic inhibition of endogenous H2S production was able to decrease vascularization of VHL-deficient ccRCC xenografts. Endogenous H2S production is an attractive new target in ccRCC due to its involvement in multiple aspects of disease.
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Cardiac H2S Generation Is Reduced in Ageing Diabetic Mice. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2015; 2015:758358. [PMID: 26078817 PMCID: PMC4442299 DOI: 10.1155/2015/758358] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2014] [Revised: 01/05/2015] [Accepted: 01/05/2015] [Indexed: 11/18/2022]
Abstract
Aims. To examine whether hydrogen sulfide (H2S) generation changed in ageing diabetic mouse hearts. Results. Compared to mice that were fed tap water only, mice that were fed 30% fructose solution for 15 months exhibited typical characteristics of a severe diabetic phenotype with cardiac hypertrophy, fibrosis, and dysfunction. H2S levels in plasma, heart tissues, and urine were significantly reduced in these mice as compared to those in controls. The expression of the H2S-generating enzymes, cystathionine γ-lyase and 3-mercaptopyruvate sulfurtransferase, was significantly decreased in the hearts of fructose-fed mice, whereas cystathionine-β-synthase levels were significantly increased. Conclusion. Our results suggest that this ageing diabetic mouse model developed diabetic cardiomyopathy and that H2S levels were reduced in the diabetic heart due to alterations in three H2S-producing enzymes, which may be involved in the pathogenesis of diabetic cardiomyopathy.
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Abstract
SIGNIFICANCE Hydrogen sulfide (H2S), once associated with rotten eggs and sewers, is now recognized as a gasotransmitter that is synthesized in vivo in a regulated fashion. This ancient gaseous molecule has been retained throughout evolution to perform various roles in different life forms. H2S modulates important signaling functions in diverse cellular processes ranging from regulation of blood pressure to redox homeostasis. RECENT ADVANCES One of the modes by which H2S signals is by post-translational modification of reactive cysteine residues in a process designated as sulfhydration, resulting in conversion of the -SH groups of target cysteine residues to -SSH. Using the modified biotin-switch assay and a fluorescent maleimide-based analysis, sulfhydration of several proteins has been detected in various cell types. Aberrant sulfhydration patterns occur in neurodegenerative conditions such as Parkinson's disease. CRITICAL ISSUES The exact concentration, source of H2S, and conditions under which various stores of H2S are utilized have not been fully elucidated. Currently, available inhibitors of the biosynthetic enzymes of H2S lack sufficient specificity to shed light on detailed mechanisms of H2S action. Probes with a higher sensitivity that can reliably detect cellular and tissue H2S levels are yet to be developed. FUTURE DIRECTIONS Availability of advanced probes and biosynthesis inhibitors would help in the measurement of real-time changes of endogenous H2S levels in an in vivo context. The study of the dynamics of sulfhydration and nitrosylation of critical cysteine residues of regulatory proteins involved in physiology and pathophysiology is an area of interest for the future.
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Affiliation(s)
- Bindu D Paul
- 1 The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine , Baltimore, Maryland
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Huang P, Chen S, Wang Y, Liu J, Yao Q, Huang Y, Li H, Zhu M, Wang S, Li L, Tang C, Tao Y, Yang G, Du J, Jin H. Down-regulated CBS/H2S pathway is involved in high-salt-induced hypertension in Dahl rats. Nitric Oxide 2015; 46:192-203. [PMID: 25617698 DOI: 10.1016/j.niox.2015.01.004] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Revised: 01/13/2015] [Accepted: 01/17/2015] [Indexed: 12/22/2022]
Abstract
BACKGROUND The study was designed to explore the significance of endogenous H2S in the development of high-salt-induced hypertension in rats. METHODS High-salt-induced hypertension rat model was made by feeding Dahl rat high-salt diet containing 8% NaCl for 8 weeks with SD rats as control. SBP and aorta structure in rats were observed. Endogenous H2S content and expression of cystathionine β-lyase (CBS), cystathionine γ-lyase and mercaptopyruvate sulfurtransferase in renal tissues were detected. Mechanisms for the impact of high-salt on CBS/H2S in renal tissues were studied, targeting HIF-1α pathway. The effect of H2S on RAS in serum and renal tissue of rats were tested. RESULTS High-salt reduced endogenous H2S content and inhibited the expression of CBS in renal tissue in salt-sensitive Dahl rats. H2S donor, however, inhibited salt-sensitive hypertension, reversed aortic structural remodeling and inhibited activation of the RAS system in renal tissues in Dahl rats. Expression of HIF-1α was decreased but expression of PHD2 was increased in renal tissue of Dahl rats with high-salt diet, whereas they did not alter in renal tissue of SD rats with high-salt diet. Ex vivo experiment showed that inhibitor of HIF-1α degradation could rescue down-regulated CBS/H2S pathway in renal tissue of Dahl rats with high-salt. In contrast, inhibitor of HIF-1α activity decreased the CBS/H2S pathway in the renal tissue of SD rats treated with high-salt. CONCLUSIONS Down-regulated CBS/H2S pathway in renal tissues under high-salt insult might be an important pathogenesis of salt-sensitive hypertension.
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Affiliation(s)
- Pan Huang
- Department of Pediatrics, Peking University First Hospital, Beijing 100034, China
| | - Siyao Chen
- Department of Pediatrics, Peking University First Hospital, Beijing 100034, China
| | - Yuan Wang
- Department of Pediatrics, Peking University First Hospital, Beijing 100034, China
| | - Jia Liu
- Department of Pediatrics, Peking University First Hospital, Beijing 100034, China
| | - Qiuyu Yao
- Department of Pediatrics, Peking University First Hospital, Beijing 100034, China
| | - Yaqian Huang
- Department of Pediatrics, Peking University First Hospital, Beijing 100034, China
| | - Hongxia Li
- Department of Pediatrics, Peking University First Hospital, Beijing 100034, China
| | - Mingzhu Zhu
- Department of Pediatrics, Peking University First Hospital, Beijing 100034, China
| | - Suxia Wang
- Lab of Electric Microscopy, Peking University First Hospital, Beijing 100034, China
| | - Lin Li
- Central Laboratory, Peking University First Hospital, Beijing 100034, China
| | - Chaoshu Tang
- Key Laboratory of Molecular Cardiology, Ministry of Education, Beijing 100191, China; Department of Physiology and Pathophysiology, Peking University Health Science Centre, Beijing 100191, China
| | - Yinghong Tao
- Animal Center, Peking University First Hospital, Beijing, 100034, China
| | - Guosheng Yang
- Animal Center, Peking University First Hospital, Beijing, 100034, China
| | - Junbao Du
- Department of Pediatrics, Peking University First Hospital, Beijing 100034, China; Key Laboratory of Molecular Cardiology, Ministry of Education, Beijing 100191, China
| | - Hongfang Jin
- Department of Pediatrics, Peking University First Hospital, Beijing 100034, China.
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Korbolina EE, Ershov NI, Bryzgalov LO, Kolosova NG. Application of quantitative trait locus mapping and transcriptomics to studies of the senescence-accelerated phenotype in rats. BMC Genomics 2014; 15 Suppl 12:S3. [PMID: 25563673 PMCID: PMC4303943 DOI: 10.1186/1471-2164-15-s12-s3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Background Etiology of complex disorders, such as cataract and neurodegenerative diseases including age-related macular degeneration (AMD), remains poorly understood due to the paucity of animal models, fully replicating the human disease. Previously, two quantitative trait loci (QTLs) associated with early cataract, AMD-like retinopathy, and some behavioral aberrations in senescence-accelerated OXYS rats were uncovered on chromosome 1 in a cross between OXYS and WAG rats. To confirm the findings, we generated interval-specific congenic strains, WAG/OXYS-1.1 and WAG/OXYS-1.2, carrying OXYS-derived loci of chromosome 1 in the WAG strain. Both congenic strains displayed early cataract and retinopathy but differed clinically from OXYS rats. Here we applied a high-throughput RNA sequencing (RNA-Seq) strategy to facilitate nomination of the candidate genes and functional pathways that may be responsible for these differences and can contribute to the development of the senescence-accelerated phenotype of OXYS rats. Results First, the size and map position of QTL-derived congenic segments were determined by comparative analysis of coding single-nucleotide polymorphisms (SNPs), which were identified for OXYS, WAG, and congenic retinal RNAs after sequencing. The transferred locus was not what we expected in WAG/OXYS-1.1 rats. In rat retina, 15442 genes were expressed. Coherent sets of differentially expressed genes were identified when we compared RNA-Seq retinal profiles of 20-day-old WAG/OXYS-1.1, WAG/OXYS-1.2, and OXYS rats. The genes most different in the average expression level between the congenic strains included those generally associated with the Wnt, integrin, and TGF-β signaling pathways, widely involved in neurodegenerative processes. Several candidate genes (including Arhgap33, Cebpg, Gtf3c1, Snurf, Tnfaip3, Yme1l1, Cbs, Car9 and Fn1) were found to be either polymorphic in the congenic loci or differentially expressed between the strains. These genes may contribute to the development of cataract and retinopathy. Conclusions This study is the first RNA-Seq analysis of the rat retinal transcriptome generated with 40 mln sequencing read depth. The integration of QTL and transcriptomic analyses in our study forms the basis of future research into the relationship between the candidate genes within the congenic regions and specific changes in the retinal transcriptome as possible causal mechanisms that underlie age-associated disorders.
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Abstract
Hydrogen sulfide (H2S) has emerged as a key regulator of cardiovascular function. This gasotransmitter is produced in the vasculature and is involved in numerous processes that promote vascular homeostasis, including vasodilation and endothelial cell proliferation. Although H2S plays a role under physiological conditions, it has become clear in recent years that hypoxia modulates the production and action of H2S. Furthermore, there is growing evidence that H2S is cytoprotective in the face of hypoxic insults. This review focuses on the synthesis and signaling of H2S in hypoxic conditions in the vasculature, and highlights recent studies providing evidence that H2S is a potential therapy for preventing tissue damage in hypoxic conditions.
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Affiliation(s)
- Jessica M Osmond
- Vascular Physiology Group, Department of Cell Biology and Physiology, University of New Mexico Health Sciences Center, Albuquerque, NM, USA
| | - Nancy L Kanagy
- Vascular Physiology Group, Department of Cell Biology and Physiology, University of New Mexico Health Sciences Center, Albuquerque, NM, USA
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Takano N, Sarfraz Y, Gilkes DM, Chaturvedi P, Xiang L, Suematsu M, Zagzag D, Semenza GL. Decreased expression of cystathionine β-synthase promotes glioma tumorigenesis. Mol Cancer Res 2014; 12:1398-406. [PMID: 24994751 DOI: 10.1158/1541-7786.mcr-14-0184] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
UNLABELLED Cystathionine β-synthase (CBS) catalyzes metabolic reactions that convert homocysteine to cystathionine. To assess the role of CBS in human glioma, cells were stably transfected with lentiviral vectors encoding shRNA targeting CBS or a nontargeting control shRNA, and subclones were injected into immunodeficient mice. Interestingly, decreased CBS expression did not affect proliferation in vitro but decreased the latency period before rapid tumor xenograft growth after subcutaneous injection and increased tumor incidence and volume following orthotopic implantation into the caudate-putamen. In soft-agar colony formation assays, CBS knockdown subclones displayed increased anchorage-independent growth. Molecular analysis revealed that CBS knockdown subclones expressed higher basal levels of the transcriptional activator hypoxia-inducible factor 2α (HIF2α/EPAS1). HIF2α knockdown counteracted the effect of CBS knockdown on anchorage-independent growth. Bioinformatic analysis of mRNA expression data from human glioma specimens revealed a significant association between low expression of CBS mRNA and high expression of angiopoietin-like 4 (ANGPTL4) and VEGF transcripts, which are HIF2 target gene products that were also increased in CBS knockdown subclones. These results suggest that decreased CBS expression in glioma increases HIF2α protein levels and HIF2 target gene expression, which promotes glioma tumor formation. IMPLICATIONS CBS loss-of-function promotes glioma growth.
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Affiliation(s)
- Naoharu Takano
- Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland. McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland. Department of Biochemistry, School of Medicine, Keio University, Tokyo, Japan
| | - Yasmeen Sarfraz
- Microvascular and Molecular Neuro-Oncology Laboratory, New York University School of Medicine, New York, New York
| | - Daniele M Gilkes
- Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland. McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Pallavi Chaturvedi
- Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland. McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Lisha Xiang
- Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland. McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Makoto Suematsu
- Department of Biochemistry, School of Medicine, Keio University, Tokyo, Japan
| | - David Zagzag
- Microvascular and Molecular Neuro-Oncology Laboratory, New York University School of Medicine, New York, New York. Division of Neuropathology, Department of Pathology and Neurosurgery, New York University School of Medicine, New York, New York
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