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Sousa J, Martins LC, Moura J, Pereira A, Vasconcelos B, Ferro G, Vasconcelos P, Quaresma J. Endoplasmic Reticulum Stress in Tuberculosis: Molecular Bases and Pathophysiological Implications in the Immunopathogenesis of the Disease. Int J Mol Sci 2025; 26:4522. [PMID: 40429667 PMCID: PMC12111063 DOI: 10.3390/ijms26104522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2025] [Revised: 04/29/2025] [Accepted: 05/03/2025] [Indexed: 05/29/2025] Open
Abstract
Tuberculosis (TB), caused by Mycobacterium tuberculosis (Mtb), is a severe pulmonary disease with high mortality, particularly in low-income countries. Early diagnosis and timely treatment, including both intensive and maintenance phases, are critical for controlling the disease and preventing its transmission. In Brazil, where TB incidence remains high, thousands of new cases are reported annually. Transmission occurs primarily through airborne droplets expelled by infected individuals. The immune response involves various cell types, such as lymphocytes and macrophages, which form granulomas to limit the spread of the bacillus. Upon entering the lungs, Mtb is phagocytosed by immune cells, where it evades destruction by blocking phagolysosome formation and inhibiting phagosome acidification. In response, the immune system forms granulomas that contain the infection, although these can become reactivated if immune function deteriorates. Mtb also interferes with host cellular organelles, particularly the endoplasmic reticulum (ER) and mitochondria, inducing cellular stress and apoptosis, which aids in its survival. Key Mtb-secreted proteins, such as BAG2 and CdhM, modulate autophagy and apoptosis pathways, influencing pathogen survival within immune cells. A deeper understanding of these molecular mechanisms, particularly the role of ER stress and its impact on immune responses, is essential for developing novel therapeutic strategies for TB prevention and treatment.
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Affiliation(s)
- Jorge Sousa
- Departamento de Patologia, Universidade do Estado do Pará, Belém 66050-540, Brazil;
| | - Lívia Caricio Martins
- Seção de Arbovirologia e Febres Hemorrágicas, Instituto Evandro Chagas, Ananindeua 67030-000, Brazil;
| | - Julia Moura
- Faculdade de Medicina, Universidade do Estado do Pará, Belém 66050-540, Brazil; (J.M.); (A.P.); (G.F.)
| | - Amanda Pereira
- Faculdade de Medicina, Universidade do Estado do Pará, Belém 66050-540, Brazil; (J.M.); (A.P.); (G.F.)
| | | | - Gustavo Ferro
- Faculdade de Medicina, Universidade do Estado do Pará, Belém 66050-540, Brazil; (J.M.); (A.P.); (G.F.)
| | - Pedro Vasconcelos
- Departamento de Patologia, Universidade do Estado do Pará, Belém 66050-540, Brazil;
- Seção de Arbovirologia e Febres Hemorrágicas, Instituto Evandro Chagas, Ananindeua 67030-000, Brazil;
- Faculdade de Medicina, Universidade do Estado do Pará, Belém 66050-540, Brazil; (J.M.); (A.P.); (G.F.)
| | - Juarez Quaresma
- Departamento de Patologia, Universidade do Estado do Pará, Belém 66050-540, Brazil;
- Seção de Arbovirologia e Febres Hemorrágicas, Instituto Evandro Chagas, Ananindeua 67030-000, Brazil;
- Faculdade de Medicina, Universidade do Estado do Pará, Belém 66050-540, Brazil; (J.M.); (A.P.); (G.F.)
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Mattocks DAL, Ommi NB, Malloy VL, Nichenametla SN. An antireductant approach ameliorates misfolded proinsulin-induced hyperglycemia and glucose intolerance in male Akita mice. GeroScience 2025; 47:1653-1668. [PMID: 39294474 PMCID: PMC11979071 DOI: 10.1007/s11357-024-01326-6] [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: 03/20/2024] [Accepted: 08/23/2024] [Indexed: 09/20/2024] Open
Abstract
Protein folding in the endoplasmic reticulum (ER) requires a high ratio of oxidized to reduced glutathione (GSSG/rGSH). Since the GSSG/rGSH depends on total glutathione (tGSH = GSSG + rGSH) levels, we hypothesized that limiting GSH biosynthesis will ameliorate protein misfolding by enhancing the ER oxidative milieu. As a proof-of-concept, we used DL-buthionine-(S,R)-sulfoximine (BSO) to inhibit GSH biosynthesis in Akita mice, which are prone to proinsulin misfolding. We conducted a 2-week intervention to investigate if BSO was safe and a 6-week intervention to find its effect on glucose intolerance. In both cohorts, male heterozygous Akita (AK) and wild-type (WT) mice were continuously administered 15 mM BSO. No adverse effects were observed on body weight, food intake, and water intake in either cohort. Unaltered levels of plasma aspartate and alanine aminotransferases, and cystatin-C, indicate that BSO was safe. BSO-induced decreases in tGSH were tissue-dependent with maximal effects in the kidneys, where it altered the expression of genes associated with GSH biosynthesis, redox status, and proteostasis. BSO treatment decreased random blood glucose levels to 80% and 67% of levels in untreated mice in short-term and long-term cohorts, respectively, and 6-h fasting blood glucose to 82% and 74% of levels in untreated mice, respectively. BSO also improved glucose tolerance by 37% in AK mice in the long-term cohort, without affecting insulin tolerance. Neither glucose tolerance nor insulin tolerance were affected in WT. Data indicate that BSO might treat misfolded proinsulin-induced glucose intolerance. Future studies should investigate the effect of BSO on proinsulin misfolding and if it improves glucose intolerance in individuals with Mutant Insulin Diabetes of Youth.
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Affiliation(s)
- Dwight A L Mattocks
- Animal Science Laboratory, Orentreich Foundation for the Advancement of Science Inc., 855, Route 301, Cold Spring-on-Hudson, NY, 10516, USA
| | - Naidu B Ommi
- Animal Science Laboratory, Orentreich Foundation for the Advancement of Science Inc., 855, Route 301, Cold Spring-on-Hudson, NY, 10516, USA
| | - Virginia L Malloy
- Animal Science Laboratory, Orentreich Foundation for the Advancement of Science Inc., 855, Route 301, Cold Spring-on-Hudson, NY, 10516, USA
| | - Sailendra N Nichenametla
- Animal Science Laboratory, Orentreich Foundation for the Advancement of Science Inc., 855, Route 301, Cold Spring-on-Hudson, NY, 10516, USA.
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Loopmans S, Rohlenova K, van Brussel T, Stockmans I, Moermans K, Peredo N, Carmeliet P, Lambrechts D, Stegen S, Carmeliet G. The pentose phosphate pathway controls oxidative protein folding and prevents ferroptosis in chondrocytes. Nat Metab 2025; 7:182-195. [PMID: 39794539 PMCID: PMC11774761 DOI: 10.1038/s42255-024-01187-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2024] [Accepted: 11/15/2024] [Indexed: 01/13/2025]
Abstract
Bone lengthening and fracture repair depend on the anabolic properties of chondrocytes that function in an avascular milieu. The limited supply of oxygen and nutrients calls into question how biosynthesis and redox homeostasis are guaranteed. Here we show that glucose metabolism by the pentose phosphate pathway (PPP) is essential for endochondral ossification. Loss of glucose-6-phosphate dehydrogenase in chondrocytes does not affect cell proliferation because reversal of the non-oxidative PPP produces ribose-5-phosphate. However, the decreased NADPH production reduces glutathione recycling, resulting in decreased protection against the reactive oxygen species (ROS) produced during oxidative protein folding. The disturbed proteostasis activates the unfolded protein response and protein degradation. Moreover, the oxidative stress induces ferroptosis, which, together with altered matrix properties, results in a chondrodysplasia phenotype. Collectively, these data show that in hypoxia, the PPP is crucial to produce reducing power that confines ROS generated by oxidative protein folding and thereby controls proteostasis and prevents ferroptosis.
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Affiliation(s)
- Shauni Loopmans
- Laboratory of Clinical and Experimental Endocrinology, Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium
| | - Katerina Rohlenova
- Laboratory of Angiogenesis and Vascular Metabolism, Department of Oncology and Leuven Cancer Institute (LKI), KU Leuven, VIB Center for Cancer Biology, VIB, Leuven, Belgium
- Laboratory of Cellular Metabolism, Institute of Biotechnology of the Czech Academy of Sciences, Vestec, Czechia
| | - Thomas van Brussel
- Laboratory of Translational Genetics, VIB Center for Cancer Biology, Leuven, Belgium
- Laboratory of Translational Genetics, Department of Human Genetics and Leuven Cancer Institute, KU Leuven, Leuven, Belgium
| | - Ingrid Stockmans
- Laboratory of Clinical and Experimental Endocrinology, Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium
| | - Karen Moermans
- Laboratory of Clinical and Experimental Endocrinology, Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium
| | - Nicolas Peredo
- VIB Bioimaging Core Leuven, Center for Brain and Disease Research, Leuven, Belgium
- VIB Bioimaging Core Leuven, Department of Neurosciences, KU Leuven, Leuven, Belgium
| | - Peter Carmeliet
- Laboratory of Angiogenesis and Vascular Metabolism, Department of Oncology and Leuven Cancer Institute (LKI), KU Leuven, VIB Center for Cancer Biology, VIB, Leuven, Belgium
- Center for Biotechnology, Khalifa University of Science and Technology, Abu Dhabi, United Arab Emirates
| | - Diether Lambrechts
- Laboratory of Translational Genetics, VIB Center for Cancer Biology, Leuven, Belgium
- Laboratory of Translational Genetics, Department of Human Genetics and Leuven Cancer Institute, KU Leuven, Leuven, Belgium
| | - Steve Stegen
- Laboratory of Clinical and Experimental Endocrinology, Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium
| | - Geert Carmeliet
- Laboratory of Clinical and Experimental Endocrinology, Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium.
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Dayasiri K, Pathiraja H, Thadchanamoorthy V. Acute hemolytic crisis complicated with ischemic cardiac injury and methemoglobinaemia following ingestion of naphthalene: a case report. J Med Case Rep 2024; 18:637. [PMID: 39716316 DOI: 10.1186/s13256-024-04980-8] [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: 03/13/2024] [Accepted: 11/19/2024] [Indexed: 12/25/2024] Open
Abstract
BACKGROUND Naphthalene is an aromatic hydrocarbon that potentially produces methemoglobinaemia but rarely causes hemolysis, especially in children with underlying glucose-6-phosphate dehydrogenase deficiency. Although ingestion of a single moth ball by an older child may not be life threatening, it can be fatal if ingested by a toddler. CASE PRESENTATION A 2-year-old Singhalese boy developed acute severe hemolysis and methemoglobinaemia following ingestion of a mothball. On admission, the patient was ill and pale. The child was tachycardic and tachypnoiec with oxygen saturation of 76% on air. Blood investigations showed significant anemia, elevated reticulocytes, and evidence of hemolysis in a blood picture, along with elevated lactate dehydrogenase and indirect bilirubin. Child also had ST depressions on electrocardiogram examination with negative troponin-I. He was given four packed red blood cell (PRBC) transfusions and was successfully discharged in 3 days time following optimal supportive treatment. A glucose-6-phosphate dehydrogenase assay confirmed the diagnosis of glucose-6-phosphate dehydrogenase deficiency in this child: 0.9 U/gHb (4.0-13.0 U/gHb). CONCLUSION This case report highlights a rare life-threatening presentation of naphthalene ingestion in a child with previously undiagnosed glucose-6-phosphate dehydrogenase deficiency. Ingestion of even a single moth ball can be fatal in vulnerable children given the altered toxicokinetics of naphthalene in children.
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Affiliation(s)
- Kavinda Dayasiri
- Faculty of Medicine, University of Kelaniya, Colombo, Sri Lanka.
| | | | - V Thadchanamoorthy
- Faculty of Healthcare Sciences, Eastern University of Sri Lanka, Chenkaladi, Sri Lanka
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Hanau S, Helliwell JR. Glucose-6-phosphate dehydrogenase and its 3D structures from crystallography and electron cryo-microscopy. Acta Crystallogr F Struct Biol Commun 2024; 80:236-251. [PMID: 39259139 PMCID: PMC11448927 DOI: 10.1107/s2053230x24008112] [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: 04/11/2024] [Accepted: 08/16/2024] [Indexed: 09/12/2024] Open
Abstract
Glucose-6-phosphate dehydrogenase (G6PD) is the first enzyme in the pentose phosphate pathway. It has been extensively studied by biochemical and structural techniques. 13 X-ray crystal structures and five electron cryo-microscopy structures in the PDB are focused on in this topical review. Two F420-dependent glucose-6-phosphate dehydrogenase (FGD) structures are also reported. The significant differences between human and parasite G6PDs can be exploited to find selective drugs against infections such as malaria and leishmaniasis. Furthermore, G6PD is a prognostic marker in several cancer types and is also considered to be a tumour target. On the other hand, FGD is considered to be a target against Mycobacterium tuberculosis and possesses a high biotechnological potential in biocatalysis and bioremediation.
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Affiliation(s)
- Stefania Hanau
- Department of Neuroscience and Rehabilitation, University of Ferrara, Ferrara, Italy
| | - John R Helliwell
- Department of Chemistry, University of Manchester, Manchester M13 9PL, United Kingdom
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Sharova EI, Medvedev SS. Reactive Byproducts of Plant Redox Metabolism and Protein Functions. Acta Naturae 2024; 16:48-61. [PMID: 39877007 PMCID: PMC11771839 DOI: 10.32607/actanaturae.27477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2024] [Accepted: 10/18/2024] [Indexed: 01/31/2025] Open
Abstract
Living organisms exhibit an impressive ability to expand the basic information encoded in their genome, specifically regarding the structure and function of protein. Two basic strategies are employed to increase protein diversity and functionality: alternative mRNA splicing and post-translational protein modifications (PTMs). Enzymatic regulation is responsible for the majority of the chemical reactions occurring within living cells. However, plants redox metabolism perpetually generates reactive byproducts that spontaneously interact with and modify biomolecules, including proteins. Reactive carbonyls resulted from the oxidative metabolism of carbohydrates and lipids carbonylate proteins, leading to the latter inactivation and deposition in the form of glycation and lipoxidation end products. The protein nitrosylation caused by reactive nitrogen species plays a crucial role in plant morphogenesis and stress reactions. The redox state of protein thiol groups modified by reactive oxygen species is regulated through the interplay of thioredoxins and glutaredoxins, thereby influencing processes such as protein folding, enzyme activity, and calcium and hormone signaling. This review provides a summary of the PTMs caused by chemically active metabolites and explores their functional consequences in plant proteins.
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Affiliation(s)
- E. I. Sharova
- St Petersburg University, St. Petersburg, 199034 Russian Federation
| | - S. S. Medvedev
- St Petersburg University, St. Petersburg, 199034 Russian Federation
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Morelli AM, Scholkmann F. Should the standard model of cellular energy metabolism be reconsidered? Possible coupling between the pentose phosphate pathway, glycolysis and extra-mitochondrial oxidative phosphorylation. Biochimie 2024; 221:99-109. [PMID: 38307246 DOI: 10.1016/j.biochi.2024.01.018] [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: 08/07/2023] [Revised: 01/17/2024] [Accepted: 01/30/2024] [Indexed: 02/04/2024]
Abstract
The process of cellular respiration occurs for energy production through catabolic reactions, generally with glucose as the first process step. In the present work, we introduce a novel concept for understanding this process, based on our conclusion that glucose metabolism is coupled to the pentose phosphate pathway (PPP) and extra-mitochondrial oxidative phosphorylation in a closed-loop process. According to the current standard model of glycolysis, glucose is first converted to glucose 6-phosphate (glucose 6-P) and then to fructose 6-phosphate, glyceraldehyde 3-phosphate and pyruvate, which then enters the Krebs cycle in the mitochondria. However, it is more likely that the pyruvate will be converted to lactate. In the PPP, glucose 6-P is branched off from glycolysis and used to produce NADPH and ribulose 5-phosphate (ribulose 5-P). Ribulose 5-P can be converted to fructose 6-P and glyceraldehyde 3-P. In our view, a circular process can take place in which the ribulose 5-P produced by the PPP enters the glycolysis pathway and is then retrogradely converted to glucose 6-P. This process is repeated several times until the complete degradation of glucose 6-P. The role of mitochondria in this process is to degrade lipids by beta-oxidation and produce acetyl-CoA; the function of producing ATP appears to be only secondary. This proposed new concept of cellular bioenergetics allows the resolution of some previously unresolved controversies related to cellular respiration and provides a deeper understanding of metabolic processes in the cell, including new insights into the Warburg effect.
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Affiliation(s)
| | - Felix Scholkmann
- Neurophotonics and Biosignal Processing Research Group, Biomedical Optics Research Laboratory, Department of Neonatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland.
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Hogan KA, Zeidler JD, Beasley HK, Alsaadi AI, Alshaheeb AA, Chang YC, Tian H, Hinton AO, McReynolds MR. Using mass spectrometry imaging to visualize age-related subcellular disruption. Front Mol Biosci 2023; 10:906606. [PMID: 36968274 PMCID: PMC10032471 DOI: 10.3389/fmolb.2023.906606] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 01/24/2023] [Indexed: 03/10/2023] Open
Abstract
Metabolic homeostasis balances the production and consumption of energetic molecules to maintain active, healthy cells. Cellular stress, which disrupts metabolism and leads to the loss of cellular homeostasis, is important in age-related diseases. We focus here on the role of organelle dysfunction in age-related diseases, including the roles of energy deficiencies, mitochondrial dysfunction, endoplasmic reticulum (ER) stress, changes in metabolic flux in aging (e.g., Ca2+ and nicotinamide adenine dinucleotide), and alterations in the endoplasmic reticulum-mitochondria contact sites that regulate the trafficking of metabolites. Tools for single-cell resolution of metabolite pools and metabolic flux in animal models of aging and age-related diseases are urgently needed. High-resolution mass spectrometry imaging (MSI) provides a revolutionary approach for capturing the metabolic states of individual cells and cellular interactions without the dissociation of tissues. mass spectrometry imaging can be a powerful tool to elucidate the role of stress-induced cellular dysfunction in aging.
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Affiliation(s)
- Kelly A. Hogan
- Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, PA, United States
- Signal Transduction and Molecular Nutrition Laboratory, Kogod Aging Center, Department of Anesthesiology and Perioperative Medicine, Mayo Clinic College of Medicine, Rochester, MN, United States
- Huck Institutes of the Life Sciences, Pennsylvania State University, University Park, PA, United States
| | - Julianna D. Zeidler
- Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Heather K. Beasley
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN, United States
| | - Abrar I. Alsaadi
- Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, PA, United States
| | - Abdulkareem A. Alshaheeb
- Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, PA, United States
| | - Yi-Chin Chang
- Department of Chemistry, Pennsylvania State University, University Park, PA, United States
| | - Hua Tian
- Huck Institutes of the Life Sciences, Pennsylvania State University, University Park, PA, United States
- Department of Chemistry, Pennsylvania State University, University Park, PA, United States
- *Correspondence: Hua Tian, ; Antentor O. Hinton Jr, ; Melanie R. McReynolds,
| | - Antentor O. Hinton
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN, United States
- *Correspondence: Hua Tian, ; Antentor O. Hinton Jr, ; Melanie R. McReynolds,
| | - Melanie R. McReynolds
- Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, PA, United States
- Huck Institutes of the Life Sciences, Pennsylvania State University, University Park, PA, United States
- *Correspondence: Hua Tian, ; Antentor O. Hinton Jr, ; Melanie R. McReynolds,
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