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Li C, Chen X, Zhang S, Liang C, Deng Q, Li X, Yan H. Pericyte loss via glutaredoxin2 downregulation aggravates diabetes-induced microvascular dysfunction. Exp Eye Res 2024; 247:110025. [PMID: 39117135 DOI: 10.1016/j.exer.2024.110025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Revised: 07/16/2024] [Accepted: 08/05/2024] [Indexed: 08/10/2024]
Abstract
Diabetic retinopathy (DR) is the leading cause of vision loss and blindness among working-age adults. Pericyte loss is an early pathological feature of DR. Under hyperglycemic conditions, reactive oxygen species (ROS) production increases, leading to oxidative stress and subsequent mitochondrial dysfunction and apoptosis. Dysfunctional pericyte can cause retinal vascular leakage, obliteration, and neovascularization. Glutaredoxin 2 (Grx2) is a mitochondrial glutathione-dependent oxidoreductase which protects cells against oxidative insults by safeguarding mitochondrial function. Whether Grx2 plays a protective role in diabetes-induced microvascular dysfunction remains unclear. Our findings revealed that diabetes-related stress reduced Grx2 expression in pericytes, but not in endothelial cells. Grx2 knock-in ameliorated diabetes-induced microvascular dysfunction in vivo DR models. Decreased Grx2 expression led to significant pericyte apoptosis, and pericyte dysfunction, namely reduced pericyte recruitment towards endothelial cells and increased endothelial cell permeability. Conversely, upregulating Grx2 reversed these effects. Furthermore, Grx2 regulated pericyte apoptosis by modulating complex I activity, which is crucial for pericyte mitochondrial function. Overall, our study uncovered a novel mechanism whereby high glucose inhibited Grx2 expression in vivo and in vitro. Grx2 downregulation exacerbated pericyte apoptosis, pericyte dysfunction, and retinal vascular dysfunction by inactivating complex I and mediating mitochondrial dysfunction in pericytes.
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Affiliation(s)
- Chenshuang Li
- Shaanxi Eye Hospital, Xi'an People's Hospital (Xi'an Fourth Hospital), Affiliated People's Hospital of Northwest University, Xi'an, 710004, Shaanxi Province, China; Department of Ophthalmology, the Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, Shaanxi Province, China.
| | - Xi Chen
- Shaanxi Eye Hospital, Xi'an People's Hospital (Xi'an Fourth Hospital), Affiliated People's Hospital of Northwest University, Xi'an, 710004, Shaanxi Province, China; Institute of Medical Research, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi Province, China.
| | - Siqi Zhang
- Shaanxi Eye Hospital, Xi'an People's Hospital (Xi'an Fourth Hospital), Affiliated People's Hospital of Northwest University, Xi'an, 710004, Shaanxi Province, China; Department of Ophthalmology, the Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, Shaanxi Province, China.
| | - Chen Liang
- Shaanxi Eye Hospital, Xi'an People's Hospital (Xi'an Fourth Hospital), Affiliated People's Hospital of Northwest University, Xi'an, 710004, Shaanxi Province, China; Department of Ophthalmology, the Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, Shaanxi Province, China.
| | - Qi Deng
- Institute of Medical Research, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi Province, China.
| | - Xinnan Li
- Shaanxi Eye Hospital, Xi'an People's Hospital (Xi'an Fourth Hospital), Affiliated People's Hospital of Northwest University, Xi'an, 710004, Shaanxi Province, China; Department of Ophthalmology, the Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, Shaanxi Province, China.
| | - Hong Yan
- Shaanxi Eye Hospital, Xi'an People's Hospital (Xi'an Fourth Hospital), Affiliated People's Hospital of Northwest University, Xi'an, 710004, Shaanxi Province, China; Department of Ophthalmology, the Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, Shaanxi Province, China; Institute of Medical Research, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi Province, China.
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2
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Galozzi P, Bindoli S, Baggio C, Battisti I, Leonardi A, Basso D, Arrigoni G, Sfriso P. Proteomic Profiling of Tears in Blau Syndrome Patients in Identification of Potential Disease Biomarkers. Int J Mol Sci 2024; 25:8387. [PMID: 39125957 PMCID: PMC11312868 DOI: 10.3390/ijms25158387] [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: 05/20/2024] [Revised: 07/19/2024] [Accepted: 07/24/2024] [Indexed: 08/12/2024] Open
Abstract
Blau syndrome (BS) is a rare autoinflammatory granulomatosis characterized by granulomatous arthritis, uveitis, and dermatitis. Ocular complications are particularly severe in BS, significantly contributing to morbidity. This study aims to identify potential biomarkers for BS ocular degeneration through proteomic profiling of tear samples from affected patients. Seven subjects from the same family, including four carriers of the BS-associated NOD2 mutation (p.E383K), were recruited alongside healthy controls. Tear samples were collected using Schirmer strips and analyzed via mass spectrometry. A total of 387 proteins were identified, with significant differences in protein expression between BS patients, healthy familial subjects, and healthy controls. Key findings include the overexpression of alpha-2-macroglobulin (A2M) and immunoglobulin heavy constant gamma 4 (IGHG4) in BS patients. Bioinformatic analysis revealed that differentially expressed proteins are involved in acute-phase response, extracellular exosome formation, and protein binding. Notably, neutrophils' azurophilic granule components, as azurocidin (AZU1), myeloperoxidases (MPO), and defensins (DEFA3), were highly expressed in the most severely affected subject, suggesting a potential role of neutrophils in BS ocular severity. These proteins might be promising biomarkers for ocular involvement in BS, facilitating early detection and tailored treatment strategies.
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Affiliation(s)
- Paola Galozzi
- Laboratory Medicine Unit, Department of Medicine DIMED, University of Padova, Via Giustiniani 2, 35128 Padova, Italy
| | - Sara Bindoli
- Rheumatology Unit, Department of Medicine DIMED, University of Padova, Via Giustiniani 2, 35128 Padova, Italy
| | - Chiara Baggio
- Rheumatology Unit, Department of Medicine DIMED, University of Padova, Via Giustiniani 2, 35128 Padova, Italy
| | - Ilaria Battisti
- Department of Biomedical Sciences, University of Padova, 35128 Padova, Italy
| | - Andrea Leonardi
- Ophthalmology Unit, Department of Neuroscience, University of Padova, 35128 Padova, Italy
| | - Daniela Basso
- Laboratory Medicine Unit, Department of Medicine DIMED, University of Padova, Via Giustiniani 2, 35128 Padova, Italy
| | - Giorgio Arrigoni
- Department of Biomedical Sciences, University of Padova, 35128 Padova, Italy
| | - Paolo Sfriso
- Rheumatology Unit, Department of Medicine DIMED, University of Padova, Via Giustiniani 2, 35128 Padova, Italy
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Kumaravel N, Ebinezer LB, Ashwin NMR, Franchin C, Battisti I, Carletti P, Ramesh Sundar A, Masi A, Malathi P, Viswanathan R, Arrigoni G. Comparative proteomics of sugarcane smut fungus - Sporisorium scitamineum unravels dynamic proteomic alterations during the dimorphic transition. J Proteomics 2024; 304:105230. [PMID: 38901800 DOI: 10.1016/j.jprot.2024.105230] [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: 12/11/2023] [Revised: 06/07/2024] [Accepted: 06/16/2024] [Indexed: 06/22/2024]
Abstract
Life cycle of the dimorphic sugarcane smut fungi, Sporisorium scitamineum, involves recognition and mating of compatible saprophytic yeast-like haploid sporidia (MAT-1 and MAT-2) that upon fusion, develop into infective dikaryotic mycelia. Although the dimorphic transition is intrinsically linked with the pathogenicity and virulence of S. scitamineum, it has never been studied using a proteomic approach. In the present study, an iTRAQ-based comparative proteomic analysis of three distinct stages was carried out. The stages were: the dimorphic transition period - haploid sporidial stage (MAT-1 and MAT-2); the transition phase (24 h post co-culturing (hpc)) and the dikaryotic mycelial stage (48 hpc). Functional categorization of differentially abundant proteins showed that the most altered biological processes were energy production, primary metabolism, especially, carbohydrate, amino acid, fatty acid, followed by translation, post-translation and protein turnover. Several differentially abundant proteins (DAPs), especially in the dikaryotic mycelial stage were predicted as effectors. Taken together, key molecular mechanisms underpinning the dimorphic transition in S. scitamineum at the proteome level were highlighted. The catalogue of stage-specific and dimorphic transition-associated-proteins and potential effectors identified herein represents a list of potential candidates for defective mutant screening to elucidate their functional role in the dimorphic transition and pathogenicity in S. scitamineum. BIOLOGICAL SIGNIFICANCE: Being the first comparative proteomics analysis of S. scitamineum, this study comprehensively examined three pivotal life cycle stages of the pathogen: the non-pathogenic haploid phase, the transition phase, and the pathogenic dikaryotic mycelial stage. While previous studies have reported the sugarcane and S. scitamineum interactions, this study endeavored to specifically identify the proteins responsible for pathogenicity. By analyzing the proteomic alterations between the haploid and dikaryotic mycelial phases, the study revealed significant changes in metabolic pathway-associated proteins linked to energy production, notably oxidative phosphorylation, and the citrate cycle. Furthermore, this study successfully identified key metabolic pathways that undergo reprogramming during the transition from the non-pathogenic to the pathogenic stage. The study also deciphered the underlying mechanisms driving the morphological and physiological alterations crucial for the S. scitamineum virulence. By studying its life cycle stages, identifying the key metabolic pathways and stage-specific proteins, it provides unprecedented insights into the pathogenicity and potential avenues for intervention. As proteomics continues to advance, such studies pave the way for a deeper understanding of plant-pathogen interactions and the development of innovative strategies to mitigate the impact of devastating pathogens like S. scitamineum.
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Affiliation(s)
- Nalayeni Kumaravel
- Division of Crop Protection, Indian Council of Agricultural Research - Sugarcane Breeding Institute, Coimbatore 641007, Tamil Nadu, India.
| | - Leonard Barnabas Ebinezer
- Department of Agronomy, Food, Natural Resources, Animals, and Environment, University of Padova, viale dell'Università, 16, 35020 Padova, Italy.
| | - N M R Ashwin
- Division of Crop Protection, Indian Council of Agricultural Research - Sugarcane Breeding Institute, Coimbatore 641007, Tamil Nadu, India; Biochemical Sciences Division, Council of Scientific and Industrial Research - National Chemical Laboratory, Pune 411008, Maharashtra, India.
| | - Cinzia Franchin
- Proteomics Center, University of Padova and Azienda Ospedaliera di Padova, via G. Orus 2/B, 35129 Padova, Italy; Department of Biomedical Sciences, University of Padova, via U. Bassi 58/B, 35131 Padova, Italy.
| | - Ilaria Battisti
- Department of Agronomy, Food, Natural Resources, Animals, and Environment, University of Padova, viale dell'Università, 16, 35020 Padova, Italy.
| | - Paolo Carletti
- Department of Agronomy, Food, Natural Resources, Animals, and Environment, University of Padova, viale dell'Università, 16, 35020 Padova, Italy.
| | - Amalraj Ramesh Sundar
- Division of Crop Protection, Indian Council of Agricultural Research - Sugarcane Breeding Institute, Coimbatore 641007, Tamil Nadu, India.
| | - Antonio Masi
- Department of Agronomy, Food, Natural Resources, Animals, and Environment, University of Padova, viale dell'Università, 16, 35020 Padova, Italy.
| | - Palaniyandi Malathi
- Division of Crop Protection, Indian Council of Agricultural Research - Sugarcane Breeding Institute, Coimbatore 641007, Tamil Nadu, India.
| | - Rasappa Viswanathan
- Division of Crop Protection, Indian Council of Agricultural Research - Sugarcane Breeding Institute, Coimbatore 641007, Tamil Nadu, India; Indian Council of Agricultural Research - Indian Institute of Sugarcane Research, Lucknow, Uttar Pradesh 226002, India.
| | - Giorgio Arrigoni
- Proteomics Center, University of Padova and Azienda Ospedaliera di Padova, via G. Orus 2/B, 35129 Padova, Italy; Department of Biomedical Sciences, University of Padova, via U. Bassi 58/B, 35131 Padova, Italy.
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4
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Zhou H, Qi YX, Cao RY, Zhang XX, Li A, Pei DD. Causal Relationship between Mitochondrial Biological Function and Periodontitis: Evidence from a Mendelian Randomization Study. Int J Mol Sci 2024; 25:7955. [PMID: 39063197 PMCID: PMC11277052 DOI: 10.3390/ijms25147955] [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: 06/18/2024] [Revised: 07/18/2024] [Accepted: 07/19/2024] [Indexed: 07/28/2024] Open
Abstract
A growing number of studies indicate that mitochondrial dysfunction serves as a pathological mechanism for periodontitis. Therefore, this two-sample Mendelian randomization (MR) study was carried out to explore the causal associations between mitochondrial biological function and periodontitis, because the specific nature of this causal relationship remains inconclusive in existing MR studies. Inverse variance weighting, Mendelian randomization-Egger, weighted mode, simple mode, and weighted median analyses were performed to assess the causal relationships between the exposure factors and periodontitis. The results of the present study revealed a causal association between periodontitis and medium-chain specific acyl-CoA dehydrogenase (MCAD), malonyl-CoA decarboxylase (MLYCD), glutaredoxin 2 (Grx2), oligoribonuclease (ORN), and pyruvate carboxylase (PC). Notably, MCAD and MLYCD are causally linked to periodontitis, and serve as protective factors. However, Grx2, ORN, and PC function as risk factors for periodontitis. Our study established a causal relationship between mitochondrial biological function and periodontitis, and such insights may provide a promising approach for treating periodontitis via mitochondrial regulation.
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Affiliation(s)
- Huan Zhou
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi’an Jiaotong University, Xi’an 710004, China
- Department of Periodontology, College of Stomatology, Xi’an Jiaotong University, Xi’an 710004, China
| | - Yan-Xin Qi
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi’an Jiaotong University, Xi’an 710004, China
- Department of Digital Oral Implantology and Prothodontics, College of Stomatology, Xi’an Jiaotong University, Xi’an 710004, China
| | - Ruo-Yan Cao
- Department of Periodontics, Liaoning Provincial Key Laboratory of Oral Diseases, School and Hospital of Stomatology, China Medical University, Shenyang 110002, China
| | - Xi-Xuan Zhang
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi’an Jiaotong University, Xi’an 710004, China
- Department of Periodontology, College of Stomatology, Xi’an Jiaotong University, Xi’an 710004, China
| | - Ang Li
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi’an Jiaotong University, Xi’an 710004, China
- Department of Periodontology, College of Stomatology, Xi’an Jiaotong University, Xi’an 710004, China
| | - Dan-Dan Pei
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi’an Jiaotong University, Xi’an 710004, China
- Department of Digital Oral Implantology and Prothodontics, College of Stomatology, Xi’an Jiaotong University, Xi’an 710004, China
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5
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Zhou M, Hanschmann EM, Römer A, Linn T, Petry SF. The significance of glutaredoxins for diabetes mellitus and its complications. Redox Biol 2024; 71:103043. [PMID: 38377787 PMCID: PMC10891345 DOI: 10.1016/j.redox.2024.103043] [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: 12/09/2023] [Accepted: 01/13/2024] [Indexed: 02/22/2024] Open
Abstract
Diabetes mellitus is a non-communicable metabolic disease hallmarked by chronic hyperglycemia caused by beta-cell failure. Diabetic complications affect the vasculature and result in macro- and microangiopathies, which account for a significantly increased morbidity and mortality. The rising incidence and prevalence of diabetes is a major global health burden. There are no feasible strategies for beta-cell preservation available in daily clinical practice. Therefore, patients rely on antidiabetic drugs or the application of exogenous insulin. Glutaredoxins (Grxs) are ubiquitously expressed and highly conserved members of the thioredoxin family of proteins. They have specific functions in redox-mediated signal transduction, iron homeostasis and biosynthesis of iron-sulfur (FeS) proteins, and the regulation of cell proliferation, survival, and function. The involvement of Grxs in chronic diseases has been a topic of research for several decades, suggesting them as therapeutic targets. Little is known about their role in diabetes and its complications. Therefore, this review summarizes the available literature on the significance of Grxs in diabetes and its complications. In conclusion, Grxs are differentially expressed in the endocrine pancreas and in tissues affected by diabetic complications, such as the heart, the kidneys, the eye, and the vasculature. They are involved in several pathways essential for insulin signaling, metabolic inflammation, glucose and fatty acid uptake and processing, cell survival, and iron and mitochondrial metabolism. Most studies describe significant changes in glutaredoxin expression and/or activity in response to the diabetic metabolism. In general, mitigated levels of Grxs are associated with oxidative distress, cell damage, and even cell death. The induced overexpression is considered a potential part of the cellular stress-response, counteracting oxidative distress and exerting beneficial impact on cell function such as insulin secretion, cytokine expression, and enzyme activity.
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Affiliation(s)
- Mengmeng Zhou
- Clinical Research Unit, Medical Clinic and Polyclinic III, Center of Internal Medicine, Justus Liebig University, Giessen, Germany
| | - Eva-Maria Hanschmann
- Experimental and Translational Research, Department of Otorhinolaryngology, University Hospital Essen, Essen, Germany
| | - Axel Römer
- Clinical Research Unit, Medical Clinic and Polyclinic III, Center of Internal Medicine, Justus Liebig University, Giessen, Germany
| | - Thomas Linn
- Clinical Research Unit, Medical Clinic and Polyclinic III, Center of Internal Medicine, Justus Liebig University, Giessen, Germany
| | - Sebastian Friedrich Petry
- Clinical Research Unit, Medical Clinic and Polyclinic III, Center of Internal Medicine, Justus Liebig University, Giessen, Germany.
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Zhao J, Liu L, Cao YY, Gao X, Targher G, Byrne CD, Sun DQ, Zheng MH. MAFLD as part of systemic metabolic dysregulation. Hepatol Int 2024:10.1007/s12072-024-10660-y. [PMID: 38594474 DOI: 10.1007/s12072-024-10660-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Accepted: 02/11/2024] [Indexed: 04/11/2024]
Abstract
Nonalcoholic fatty liver disease (NAFLD) is one of the most common chronic liver diseases worldwide. In recent years, a new terminology and definition of metabolic dysfunction-associated fatty liver disease (MAFLD) has been proposed. Compared to the NAFLD definition, MAFLD better emphasizes the pathogenic role of metabolic dysfunction in the development and progression of this highly prevalent condition. Metabolic disorders, including overweight/obesity, type 2 diabetes mellitus (T2DM), atherogenic dyslipidemia and hypertension, are often associated with systemic organ dysfunctions, thereby suggesting that multiple organ damage can occur in MAFLD. Substantial epidemiological evidence indicates that MAFLD is not only associated with an increased risk of liver-related complications, but also increases the risk of developing several extra-hepatic diseases, including new-onset T2DM, adverse cardiovascular and renal outcomes, and some common endocrine diseases. We have summarized the current literature on the adverse effect of MAFLD on the development of multiple extrahepatic (cardiometabolic and endocrine) complications and examined the role of different metabolic pathways and organ systems in the progression of MAFLD, thus providing new insights into the role of MAFLD as a multisystem metabolic disorder. Our narrative review aimed to provide insights into potential mechanisms underlying the known associations between MAFLD and extrahepatic diseases, as part of MAFLD as a multisystem disease, in order to help focus areas for future drug development targeting not only liver disease but also the risk of extrahepatic complications.
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Affiliation(s)
- Jing Zhao
- Urologic Nephrology Center, Jiangnan University Medical Center, Wuxi, China
- Affiliated Wuxi Clinical College of Nantong University, Wuxi, China
- Wuxi No. 2 People's Hospital, Wuxi, China
| | - Lu Liu
- Urologic Nephrology Center, Jiangnan University Medical Center, Wuxi, China
- Affiliated Wuxi Clinical College of Nantong University, Wuxi, China
- Wuxi No. 2 People's Hospital, Wuxi, China
| | - Ying-Ying Cao
- MAFLD Research Center, Department of Hepatology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
- Key Laboratory of Diagnosis and Treatment for the Development of Chronic Liver Disease in Zhejiang Province, Wenzhou, Zhejiang, China
| | - Xin Gao
- Department of Endocrinology and Metabolism, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Giovanni Targher
- Department of Medicine, University of Verona, Verona, Italy
- Metabolic Diseases Research Unit, IRCCS Sacro Cuore-Don Calabria Hospital, Negrar di Valpolicella, Italy
| | - Christopher D Byrne
- Southampton National Institute for Health and Care Research Biomedical Research Centre, University Hospital Southampton, and University of Southampton, Southampton General Hospital, Southampton, UK
| | - Dan-Qin Sun
- Urologic Nephrology Center, Jiangnan University Medical Center, Wuxi, China.
- Affiliated Wuxi Clinical College of Nantong University, Wuxi, China.
- Wuxi No. 2 People's Hospital, Wuxi, China.
| | - Ming-Hua Zheng
- MAFLD Research Center, Department of Hepatology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China.
- Key Laboratory of Diagnosis and Treatment for the Development of Chronic Liver Disease in Zhejiang Province, Wenzhou, Zhejiang, China.
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Brzozowa-Zasada M, Piecuch A, Bajdak-Rusinek K, Gołąbek K, Michalski M, Janelt K, Matysiak N. Glutaredoxin 2 Protein (Grx2) as an Independent Prognostic Factor Associated with the Survival of Colon Adenocarcinoma Patients. Int J Mol Sci 2024; 25:1060. [PMID: 38256132 PMCID: PMC10816802 DOI: 10.3390/ijms25021060] [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: 11/28/2023] [Revised: 01/03/2024] [Accepted: 01/09/2024] [Indexed: 01/24/2024] Open
Abstract
Glutaredoxin 2 (Grx2; Glrx2) is a glutathione-dependent oxidoreductase located in mitochondria, which is central to the regulation of glutathione homeostasis and mitochondrial redox, and plays a crucial role in highly metabolic tissues. In response to mitochondrial redox signals and oxidative stress, Grx2 can catalyze the oxidation and S-glutathionylation of membrane-bound thiol proteins in mitochondria. Therefore, it can have a significant impact on cancer development. To investigate this further, we performed an immunohistochemical analysis of Grx2 protein expression in colon adenocarcinoma samples collected from patients with primary colon adenocarcinoma (stage I and II) and patients with metastasis to regional lymph nodes (stage III). The results of our study revealed a significant relationship between the immunohistochemical expression of Grx2 and tumor histological grade, depth of invasion, regional lymph node involvement, angioinvasion, staging, and PCNA immunohistochemical expression. It was found that 87% of patients with stage I had high levels of Grx2 expression. In contrast, only 33% of patients with stage II and 1% of patients with stage III had high levels of Grx2 expression. Moreover, the multivariate analysis revealed that the immunohistochemical expression of Grx2 protein apart from the grade of tumor differentiation was an independent prognostic factors for the survival of patients with colon adenocarcinoma. Studies analyzing Grx2 levels in patients' blood confirmed that the highest levels of serum Grx2 protein was also found in stage I patients, which was reflected in the survival curves. A higher level of Grx2 in the serum has been associated with a more favorable outcome. These results were supported by in vitro analysis conducted on colorectal cancer cell lines that corresponded to stages I, II, and III of colorectal cancer, using qRT-PCR and Western Blot.
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Affiliation(s)
- Marlena Brzozowa-Zasada
- Department of Histology and Cell Pathology in Zabrze, Faculty of Medical Sciences in Zabrze, Medical University of Silesia, 40-055 Katowice, Poland (N.M.)
| | - Adam Piecuch
- Department of Histology and Cell Pathology in Zabrze, Faculty of Medical Sciences in Zabrze, Medical University of Silesia, 40-055 Katowice, Poland (N.M.)
| | - Karolina Bajdak-Rusinek
- Department of Medical Genetics, Faculty of Medical Sciences in Katowice, Medical University of Silesia, 40-055 Katowice, Poland
| | - Karolina Gołąbek
- Department of Medical and Molecular Biology, Faculty of Medical Sciences in Zabrze, Medical University of Silesia, Jordana 19, 41-808 Zabrze, Poland
| | - Marek Michalski
- Department of Histology and Cell Pathology in Zabrze, Faculty of Medical Sciences in Zabrze, Medical University of Silesia, 40-055 Katowice, Poland (N.M.)
- Zabrze Silesian Nanomicroscopy Centre in Zabrze, Silesia LabMed-Research and Implementation Centre, Medical University of Silesia, 40-055 Katowice, Poland
| | - Kamil Janelt
- Department of Medical Genetics, Faculty of Medical Sciences in Katowice, Medical University of Silesia, 40-055 Katowice, Poland
| | - Natalia Matysiak
- Department of Histology and Cell Pathology in Zabrze, Faculty of Medical Sciences in Zabrze, Medical University of Silesia, 40-055 Katowice, Poland (N.M.)
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8
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Zhu M, Dagah OMA, Silaa BB, Lu J. Thioredoxin/Glutaredoxin Systems and Gut Microbiota in NAFLD: Interplay, Mechanism, and Therapeutical Potential. Antioxidants (Basel) 2023; 12:1680. [PMID: 37759983 PMCID: PMC10525532 DOI: 10.3390/antiox12091680] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 08/20/2023] [Accepted: 08/25/2023] [Indexed: 09/29/2023] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) is a common clinical disease, and its pathogenesis is closely linked to oxidative stress and gut microbiota dysbiosis. Recently accumulating evidence indicates that the thioredoxin and glutaredoxin systems, the two thiol-redox dependent antioxidant systems, are the key players in the NAFLD's development and progression. However, the effects of gut microbiota dysbiosis on the liver thiol-redox systems are not well clarified. This review explores the role and mechanisms of oxidative stress induced by bacteria in NAFLD while emphasizing the crucial interplay between gut microbiota dysbiosis and Trx mediated-redox regulation. The paper explores how dysbiosis affects the production of specific gut microbiota metabolites, such as trimethylamine N-oxide (TMAO), lipopolysaccharides (LPS), short-chain fatty acids (SCFAs), amino acids, bile acid, and alcohol. These metabolites, in turn, significantly impact liver inflammation, lipid metabolism, insulin resistance, and cellular damage through thiol-dependent redox signaling. It suggests that comprehensive approaches targeting both gut microbiota dysbiosis and the thiol-redox antioxidant system are essential for effectively preventing and treating NAFLD. Overall, comprehending the intricate relationship between gut microbiota dysbiosis and thiol-redox systems in NAFLD holds significant promise in enhancing patient outcomes and fostering the development of innovative therapeutic interventions.
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Affiliation(s)
| | | | | | - Jun Lu
- Engineering Research Center of Coptis Development and Utilization/Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education (Southwest University), College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China; (M.Z.); (O.M.A.D.); (B.B.S.)
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9
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Oppong D, Schiff W, Shivamadhu MC, Ahn YH. Chemistry and biology of enzymes in protein glutathionylation. Curr Opin Chem Biol 2023; 75:102326. [PMID: 37245422 PMCID: PMC10524987 DOI: 10.1016/j.cbpa.2023.102326] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 04/19/2023] [Accepted: 04/24/2023] [Indexed: 05/30/2023]
Abstract
Protein S-glutathionylation is emerging as a central oxidation that regulates redox signaling and biological processes linked to diseases. In recent years, the field of protein S-glutathionylation has expanded by developing biochemical tools for the identification and functional analyses of S-glutathionylation, investigating knockout mouse models, and developing and evaluating chemical inhibitors for enzymes involved in glutathionylation. This review will highlight recent studies of two enzymes, glutathione transferase omega 1 (GSTO1) and glutaredoxin 1 (Grx1), especially introducing their glutathionylation substrates associated with inflammation, cancer, and neurodegeneration and showcasing the advancement of their chemical inhibitors. Lastly, we will feature protein substrates and chemical inducers of LanC-like protein (LanCL), the first enzyme in protein C-glutathionylation.
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Affiliation(s)
- Daniel Oppong
- Department of Chemistry, Drexel University, Philadelphia, PA 19104, USA
| | - William Schiff
- Department of Chemistry, Drexel University, Philadelphia, PA 19104, USA
| | | | - Young-Hoon Ahn
- Department of Chemistry, Drexel University, Philadelphia, PA 19104, USA.
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10
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Teixeira V, Mohamed I, Lavoie JC. Disturbances of the Lung Glutathione System in Adult Guinea Pigs Following Neonatal Vitamin C or Cysteine Deficiency. Antioxidants (Basel) 2023; 12:1361. [PMID: 37507901 PMCID: PMC10376486 DOI: 10.3390/antiox12071361] [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: 06/06/2023] [Revised: 06/26/2023] [Accepted: 06/26/2023] [Indexed: 07/30/2023] Open
Abstract
In premature infants receiving parenteral nutrition, oxidative stress is a trigger for the development of bronchopulmonary dysplasia, which is an important factor in the development of adult lung diseases. Neonatal vitamin C and glutathione deficiency is suspected to induce permanent modification of redox metabolism favoring the development of neonatal and adult lung diseases. A total of 64 3-day-old guinea pigs were fed an oral diet that was either complete or deficient in vitamin C (VCD), cysteine (CD) (glutathione-limiting substrate) or both (DD) for 4 days. At 1 week of age, half of the animals were sacrificed while the other started a complete diet until 12 weeks of age. At 1 week, the decrease in lung GSH in all deficient groups was partially explained by the oxidation of liver methionine-adenosyltransferase. mRNA levels of kelch-like ECH-associated protein 1 (Keap1), glutathione-reductase (Gsr) and glutaredoxin-1 (Glrx) were significantly lower only in CD but not in DD. At 12 weeks, glutathione levels were increased in VCD and CD. Keap1, Gsr and Glrx mRNA were increased, while glutathione-reductase and glutaredoxin proteins were lower in CD, favoring a higher glutathionylation status. Both neonatal deficiencies result in a long-term change in glutathione metabolism that could contribute to lung diseases' development.
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Affiliation(s)
- Vitor Teixeira
- Department of Nutrition, Université de Montréal, Montréal, QC H3T 1C5, Canada
| | - Ibrahim Mohamed
- Department of Nutrition, Université de Montréal, Montréal, QC H3T 1C5, Canada
- Department of Pediatrics-Neonatology, CHU Sainte-Justine, Université de Montréal, Montréal, QC H3T 1C5, Canada
| | - Jean-Claude Lavoie
- Department of Nutrition, Université de Montréal, Montréal, QC H3T 1C5, Canada
- Department of Pediatrics-Neonatology, CHU Sainte-Justine, Université de Montréal, Montréal, QC H3T 1C5, Canada
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11
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Wang Y, Cheng W, Wang X, He T, Liu J, Chen S, Zhang J. Integrated metabolomics and network pharmacology revealing the mechanism of arsenic-induced hepatotoxicity in mice. Food Chem Toxicol 2023:113913. [PMID: 37348806 DOI: 10.1016/j.fct.2023.113913] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 04/20/2023] [Accepted: 06/19/2023] [Indexed: 06/24/2023]
Abstract
Endemic arsenic (As) poisoning is a severe biogeochemical disease that endangers human health. Epidemiological investigations and animal experiments have confirmed the damaging effects of As on the liver, but there is an urgent need to investigate the underlying mechanisms. This study adopted a metabolomic approach using UHPLC-QE/MS to identify the different metabolites and metabolic mechanisms associated with As-induced hepatotoxicity in mice. A network pharmacology approach was applied to predict the potential target of As-induced hepatotoxicity. The predicted targets of differential metabolites were subjected to a deep matching for elucidating the integration mechanisms. The results demonstrate that the levels of ALT and AST in plasma significantly increased in mice after As exposure. In addition, the liver tissue showed disorganized liver lobules, lax cytoplasm and inflammatory cell infiltration. Metabolomic analysis revealed that As exposure caused disturbance to 40 and 75 potential differential metabolites in plasma and liver, respectively. Further investigation led to discovering five vital metabolic pathways, including phenylalanine, tyrosine, and tryptophan biosynthesis and nicotinate and nicotinamide metabolism pathways. These pathways may responded to As-induced hepatotoxicity primarily through lipid metabolism, apoptosis, and deoxyribonucleic acid damage. The network pharmacology suggested that As could induce hepatotoxicity in mice by acting on targets including Hsp90aa1, Akt2, Egfr, and Tnf, which regulate PI3K Akt, HIF-1, MAPK, and TNF signaling pathways. Finally, the integrated metabolomics and network pharmacology revealed eight key targets associated with As-induced hepatoxicity, namely DNMT1, MAOB, PARP1, MAOA, EPHX2, ANPEP, XDH, and ADA. The results also suggest that nicotinic acid and nicotinamide metabolisms may be involved in As-induced hepatotoxicity. This research identified the metabolites, targets, and mechanisms of As-induced hepatotoxicity, offering meaningful insights and establishing the groundwork for developing antidotes for widespread As poisoning.
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Affiliation(s)
- Yazhi Wang
- Department of Pharmaceutical Analysis, School of Pharmacy, Zunyi Medical University, Zunyi, 563000, China
| | - Weina Cheng
- Department of Pharmaceutical Analysis, School of Pharmacy, Zunyi Medical University, Zunyi, 563000, China
| | - Xiaoning Wang
- Department of Pharmaceutical Analysis, School of Pharmacy, Zunyi Medical University, Zunyi, 563000, China
| | - Tianmu He
- School of Basic Medical Sciences, Zunyi Medical University, Zunyi, 563000, China; School of Basic Medical Sciences, Guizhou Medical University, Guiyang, 550025, China
| | - Jingxian Liu
- School of Basic Medical Sciences, Zunyi Medical University, Zunyi, 563000, China
| | - Shuangshuang Chen
- Department of Pharmaceutical Analysis, School of Pharmacy, Zunyi Medical University, Zunyi, 563000, China
| | - Jianyong Zhang
- Department of Pharmaceutical Analysis, School of Pharmacy, Zunyi Medical University, Zunyi, 563000, China.
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12
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Wang K, Moore A, Grayson C, Mailloux RJ. S-nitroso-glutathione (GSNO) inhibits hydrogen peroxide production by alpha-ketoglutarate dehydrogenase: An investigation into sex and diet effects. Free Radic Biol Med 2023; 204:287-300. [PMID: 37225107 DOI: 10.1016/j.freeradbiomed.2023.05.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Revised: 05/06/2023] [Accepted: 05/11/2023] [Indexed: 05/26/2023]
Abstract
Pyruvate dehydrogenase (PDH) and α-ketoglutarate dehydrogenase (KGDH) are vital sources of hydrogen peroxide (H2O2) and key sites for redox regulation. Here, we report KGDH is more sensitive to inhibition by S-nitroso-glutathione (GSNO) when compared to PDH and deactivation of both enzymes by nitro modification is affected by sex and diet. Liver mitochondria from male C57BL/6N mice displayed a robust inhibition of H2O2 production after exposure to 500-2000 μM GSNO. H2O2 genesis by PDH was not significantly affected by GSNO. Purified KGDH of porcine heart origin displayed a ∼82% decrease in H2O2 generating activity at 500 μM GSNO, which was mirrored by a decrease in NADH production. By contrast, H2O2- and NADH-producing activity of purified PDH was only minimally affected by an incubation in 500 μM GSNO. Incubations in GSNO had no significant effect on the H2O2-generating activity of KGDH and PDH in female liver mitochondria when compared to samples collected from males, which was attributed to higher GSNO reductase (GSNOR) activity. High fat feeding augmented the GSNO-mediated inhibition of KGDH in liver mitochondria from male mice. Exposure of male mice to a HFD also resulted in a significant decrease in the GSNO-mediated inhibition of H2O2 genesis by PDH, an effect not observed in mice fed a control-matched diet (CD). Female mice displayed higher resistance to the GSNO-induced inhibition of H2O2 production, regardless of being fed a CD or HFD. However, exposure to a HFD did result in a small but significant decrease in H2O2 production by KGDH and PDH when female liver mitochondria were treated with GSNO. Although, the effect was less when compared to their male counterparts. Collectively, we show for the first time GSNO deactivates H2O2 production by α-keto acid dehydrogenases and we demonstrate that sex and diet are determinants for the nitro-inhibition of both KGDH and PDH.
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Affiliation(s)
- Kevin Wang
- The School of Human Nutrition, Faculty of Agricultural and Environmental Sciences, McGill University, Ste.-Anne-de-Bellevue, Quebec, Canada
| | - Amanda Moore
- The School of Human Nutrition, Faculty of Agricultural and Environmental Sciences, McGill University, Ste.-Anne-de-Bellevue, Quebec, Canada
| | - Cathryn Grayson
- The School of Human Nutrition, Faculty of Agricultural and Environmental Sciences, McGill University, Ste.-Anne-de-Bellevue, Quebec, Canada
| | - Ryan J Mailloux
- The School of Human Nutrition, Faculty of Agricultural and Environmental Sciences, McGill University, Ste.-Anne-de-Bellevue, Quebec, Canada.
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13
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Aita A, Battisti I, Contran N, Furlan S, Padoan A, Franchin C, Barbaro F, Cattelan AM, Zambon CF, Plebani M, Basso D, Arrigoni G. Salivary proteomic analysis in asymptomatic and symptomatic SARS-CoV-2 infection: Innate immunity, taste perception and FABP5 proteins make the difference. Clin Chim Acta 2022; 537:26-37. [PMID: 36228679 PMCID: PMC9549389 DOI: 10.1016/j.cca.2022.09.023] [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: 07/22/2022] [Revised: 09/19/2022] [Accepted: 09/26/2022] [Indexed: 01/08/2023]
Abstract
BACKGROUND AND AIM SARS-CoV-2 infection spawns from an asymptomatic condition to a fatal disease. Age, comorbidities, and several blood biomarkers are associated with infection outcome. We searched for biomarkers by untargeted and targeted proteomic analysis of saliva, a source of viral particles and host proteins. METHODS Saliva samples from 19 asymptomatic and 16 symptomatic SARS-CoV-2 infected subjects, and 20 controls were analyzed by LC-MS/MS for untargeted peptidomic (flow through of 10 kDa filter) and proteomic (trypsin digestion of filter retained proteins) profiling. RESULTS Peptides from 53 salivary proteins were identified. ADF was detected only in controls, while IL1RA only in infected subjects. PRPs, DSC2, FABP5, his-1, IL1RA, PRH1, STATH, SMR3B, ANXA1, MUC7, ACTN4, IGKV1-33 and TGM3 were significantly different between asymptomatic and symptomatic subjects. Retained proteins were 117, being 11 highly different between asymptomatic and symptomatic (fold change ≥2 or ≤-2). After validation by LC-MS/MS-SRM (selected reaction monitoring analysis), the most significant discriminant proteins at PCA were IL1RA, CYSTB, S100A8, S100A9, CA6, and FABP5. CONCLUSIONS The differentially abundant proteins involved in innate immunity (S100 proteins), taste (CA6 and cystatins), and viral binding to the host (FABP5), appear to be of interest for use as potential biomarkers and drugs targets.
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Affiliation(s)
- Ada Aita
- Department of Medicine, University of Padova, Padova, Italy
| | - Ilaria Battisti
- Department of Agronomy, Food, Natural Resources, Animals and Environment, University of Padova, Padova, Italy,Proteomic Center of Padova University and Azienda Ospedaliera di Padova, Padova, Italy
| | - Nicole Contran
- Department of Medicine, University of Padova, Padova, Italy
| | - Serena Furlan
- Proteomic Center of Padova University and Azienda Ospedaliera di Padova, Padova, Italy
| | - Andrea Padoan
- Department of Medicine, University of Padova, Padova, Italy
| | - Cinzia Franchin
- Department of Agronomy, Food, Natural Resources, Animals and Environment, University of Padova, Padova, Italy,Proteomic Center of Padova University and Azienda Ospedaliera di Padova, Padova, Italy
| | - Francesco Barbaro
- Tropical and Infectious Diseases Unit, University Hospital of Padova, Padova, Italy
| | - Anna Maria Cattelan
- Tropical and Infectious Diseases Unit, University Hospital of Padova, Padova, Italy
| | | | - Mario Plebani
- Department of Medicine, University of Padova, Padova, Italy
| | - Daniela Basso
- Department of Medicine, University of Padova, Padova, Italy,Corresponding author at: Department of Medicine – DIMED, Laboratory Medicine, University Hospital of Padova, Padova, Italy
| | - Giorgio Arrigoni
- Proteomic Center of Padova University and Azienda Ospedaliera di Padova, Padova, Italy,Department of Biomedical Sciences, University of Padova, Padova, Italy
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14
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Kukulage DSK, Matarage Don NNJ, Ahn YH. Emerging chemistry and biology in protein glutathionylation. Curr Opin Chem Biol 2022; 71:102221. [PMID: 36223700 PMCID: PMC9844265 DOI: 10.1016/j.cbpa.2022.102221] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 09/08/2022] [Accepted: 09/09/2022] [Indexed: 01/27/2023]
Abstract
Protein S-glutathionylation serves a regulatory role in proteins and modulates distinct biological processes implicated in health and diseases. Despite challenges in analyzing the dynamic and reversible nature of S-glutathionylation, recent chemical and biological methods have significantly advanced the field of S-glutathionylation, culminating in selective identification and detection, structural motif analysis, and functional studies of S-glutathionylation. This review will highlight emerging studies of protein glutathionylation, beginning by introducing biochemical tools that enable mass spectrometric identification and live-cell imaging of S-glutathionylation. Next, it will spotlight recent examples of S-glutathionylation regulating physiology and inflammation. Lastly, we will feature two emerging lines of glutathionylation research in cryptic cysteine glutathionylation and protein C-glutathionylation.
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Affiliation(s)
| | | | - Young-Hoon Ahn
- Department of Chemistry, Drexel University, Philadelphia, PA 19104, USA.
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15
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Effect of Natural Adenylcyclase/cAMP/CREB Signalling Activator Forskolin against Intra-Striatal 6-OHDA-Lesioned Parkinson's Rats: Preventing Mitochondrial, Motor and Histopathological Defects. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27227951. [PMID: 36432051 PMCID: PMC9695774 DOI: 10.3390/molecules27227951] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 11/07/2022] [Accepted: 11/10/2022] [Indexed: 11/18/2022]
Abstract
Parkinson's disease (PD) is characterised by dopaminergic neuronal loss in the brain area. PD is a complex disease that deteriorates patients' motor and non-motor functions. In experimental animals, the neurotoxin 6-OHDA induces neuropathological, behavioural, neurochemical and mitochondrial abnormalities and the formation of free radicals, which is related to Parkinson-like symptoms after inter-striatal 6-OHDA injection. Pathological manifestations of PD disrupt the cAMP/ATP-mediated activity of the transcription factor CREB, resulting in Parkinson's-like symptoms. Forskolin (FSK) is a direct AC/cAMP/CREB activator isolated from Coleus forskohlii with various neuroprotective properties. FSK has already been proven in our laboratory to directly activate the enzyme adenylcyclase (AC) and reverse the neurodegeneration associated with the progression of Autism, Multiple Sclerosis, ALS, and Huntington's disease. Several behavioural paradigms were used to confirm the post-lesion effects, including the rotarod, open field, grip strength, narrow beam walk (NBW) and Morris water maze (MWM) tasks. Our results were supported by examining brain cellular, molecular, mitochondrial and histopathological alterations. The FSK treatment (15, 30 and 45 mg/kg, orally) was found to be effective in restoring behavioural and neurochemical defects in a 6-OHDA-induced experimental rat model of PD. As a result, the current study successfully contributes to the investigation of FSK's neuroprotective role in PD prevention via the activation of the AC/cAMP/PKA-driven CREB pathway and the restoration of mitochondrial ETC-complex enzymes.
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16
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Li J, Tang X, Wen X, Ren X, Zhang H, Du Y, Lu J. Mitochondrial Glrx2 Knockout Augments Acetaminophen-Induced Hepatotoxicity in Mice. Antioxidants (Basel) 2022; 11:antiox11091643. [PMID: 36139718 PMCID: PMC9495392 DOI: 10.3390/antiox11091643] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 08/18/2022] [Accepted: 08/22/2022] [Indexed: 11/16/2022] Open
Abstract
Acetaminophen (APAP) is one of the most widely used drugs with antipyretic and analgesic effects, and thus hepatotoxicity from the overdose of APAP becomes one of the most common forms of drug-induced liver injury. The reaction towards thiol molecules, such as GSH by APAP metabolite, N-acetyl-p-benzo-quinonimine (NAPQI), is the main cause of APAP-induced hepatotoxicity. However, the role of many other thiol-related regulators in toxicity caused by APAP is still unclear. Here we have found that knockout of the Glrx2 gene, which encodes mitochondrial glutaredoxin2 (Grx2), sensitized mice to APAP-caused hepatotoxicity. Glrx2 deletion hindered Nrf2-mediated compensatory recovery of thiol-dependent redox systems after acetaminophen challenge, resulting in a more oxidized cellular state with a further decrease in GSH level, thioredoxin reductase activity, and GSH/GSSG ratio. The weakened feedback regulation capacity of the liver led to higher levels of protein glutathionylation and thioredoxin (both Trx1 and Trx2) oxidation in Glrx2−/− mice. Following the cellular environment oxidation, nuclear translocation of apoptosis-inducing factor (AIF) was elevated in the liver of Glrx2−/− mice. Taken together, these results demonstrated that mitochondrial Grx2 deficiency deteriorated APAP-induced hepatotoxicity by interrupting thiol-redox compensatory response, enhancing the AIF pathway-mediated oxidative damage.
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Affiliation(s)
- Jing Li
- Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education (Southwest University), College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China
- West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu 610041, China
| | - Xuewen Tang
- Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education (Southwest University), College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China
| | - Xing Wen
- Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education (Southwest University), College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China
| | - Xiaoyuan Ren
- Division of Biochemistry, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-171 77 Stockholm, Sweden
| | - Huihui Zhang
- Shanghai Institute of Immunology, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
- Faculty of Basic Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Yatao Du
- Ministry of Education-Shanghai Key Laboratory of Children’s Environmental Health, Institute of Early Life Health, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China
| | - Jun Lu
- Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education (Southwest University), College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China
- Correspondence: ; Tel.: +86-13594206128
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