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Jiang Z. SLC25A19 is required for NADH homeostasis and mitochondrial respiration. Free Radic Biol Med 2024; 222:317-330. [PMID: 38944213 DOI: 10.1016/j.freeradbiomed.2024.06.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2024] [Revised: 05/12/2024] [Accepted: 06/24/2024] [Indexed: 07/01/2024]
Abstract
Mitochondrial transporters facilitate the translocation of metabolites between the cytoplasm and mitochondria and are critical for mitochondrial functional integrity. Although many mitochondrial transporters are associated with metabolic diseases, how they regulate mitochondrial function and their metabolic contributions at the cellular level are largely unknown. Here, we show that mitochondrial thiamine pyrophosphate (TPP) transporter SLC25A19 is required for mitochondrial respiration. SLC25A19 deficiency leads to reduced cell viability, increased integrated stress response (ISR), enhanced glycolysis and elevated cell sensitivity to 2-deoxyglucose (2-DG) treatment. Through a series of biochemical assays, we found that the depletion of mitochondrial NADH is the primary cause of the impaired mitochondrial respiration in SLC25A19 deficient cells. We also showed involvement of SLC25A19 in regulating the enzymatic activities of complexes I and III, the tricarboxylic acid (TCA) cycle, malate-aspartate shuttle and amino acid metabolism. Consistently, addition of idebenone, an analog of coenzyme Q10, restores mitochondrial respiration and cell viability in SLC25A19 deficient cells. Together, our findings provide new insight into the functions of SLC25A19 in mitochondrial and cellular physiology, and suggest that restoring mitochondrial respiration could be a novel strategy for treating SLC25A19-associated disorders.
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Affiliation(s)
- Zongsheng Jiang
- The Zhejiang University-University of Edinburgh Institute, Zhejiang University School of Medicine, Zhejiang University, Haining, 314400, China.
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2
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Khalaf A, de Beauchamp L, Kalkman E, Rattigan K, Himonas E, Jones J, James D, Shokry ESA, Scott MT, Dunn K, Tardito S, Copland M, Sumpton D, Shanks E, Helgason GV. Nutrient-sensitizing drug repurposing screen identifies lomerizine as a mitochondrial metabolism inhibitor of chronic myeloid leukemia. Sci Transl Med 2024; 16:eadi5336. [PMID: 38865484 DOI: 10.1126/scitranslmed.adi5336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Accepted: 05/15/2024] [Indexed: 06/14/2024]
Abstract
In chronic myeloid leukemia (CML), the persistence of leukemic stem cells (LSCs) after treatment with tyrosine kinase inhibitors (TKIs), such as imatinib, can lead to disease relapse. It is known that therapy-resistant LSCs rely on oxidative phosphorylation (OXPHOS) for their survival and that targeting mitochondrial respiration sensitizes CML LSCs to imatinib treatment. However, current OXPHOS inhibitors have demonstrated limited efficacy or have shown adverse effects in clinical trials, highlighting that identification of clinically safe oxidative pathway inhibitors is warranted. We performed a high-throughput drug repurposing screen designed to identify mitochondrial metabolism inhibitors in myeloid leukemia cells. This identified lomerizine, a US Food and Drug Administration (FDA)-approved voltage-gated Ca2+ channel blocker now used for the treatment of migraines, as one of the top hits. Transcriptome analysis revealed increased expression of voltage-gated CACNA1D and receptor-activated TRPC6 Ca2+ channels in CML LSCs (CD34+CD38-) compared with normal counterparts. This correlated with increased endoplasmic reticulum (ER) mass and increased ER and mitochondrial Ca2+ content in CML stem/progenitor cells. We demonstrate that lomerizine-mediated inhibition of Ca2+ uptake leads to ER and mitochondrial Ca2+ depletion, with similar effects seen after CACNA1D and TRPC6 knockdown. Through stable isotope-assisted metabolomics and functional assays, we observe that lomerizine treatment inhibits mitochondrial isocitrate dehydrogenase activity and mitochondrial oxidative metabolism and selectively sensitizes CML LSCs to imatinib treatment. In addition, combination treatment with imatinib and lomerizine reduced CML tumor burden, targeted CML LSCs, and extended survival in xenotransplantation model of human CML, suggesting this as a potential therapeutic strategy to prevent disease relapse in patients.
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MESH Headings
- Drug Repositioning
- Humans
- Mitochondria/metabolism
- Mitochondria/drug effects
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/drug therapy
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/pathology
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/metabolism
- Animals
- Cell Line, Tumor
- Endoplasmic Reticulum/metabolism
- Endoplasmic Reticulum/drug effects
- Piperazines/pharmacology
- Piperazines/therapeutic use
- Mice
- Neoplastic Stem Cells/drug effects
- Neoplastic Stem Cells/metabolism
- Neoplastic Stem Cells/pathology
- Calcium/metabolism
- Oxidative Phosphorylation/drug effects
- Imatinib Mesylate/pharmacology
- Imatinib Mesylate/therapeutic use
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Affiliation(s)
- Ahmed Khalaf
- Wolfson Wohl Cancer Research Centre, School of Cancer Sciences, University of Glasgow, Glasgow, G61 1QH, UK
| | - Lucie de Beauchamp
- Wolfson Wohl Cancer Research Centre, School of Cancer Sciences, University of Glasgow, Glasgow, G61 1QH, UK
| | - Eric Kalkman
- Wolfson Wohl Cancer Research Centre, School of Cancer Sciences, University of Glasgow, Glasgow, G61 1QH, UK
| | - Kevin Rattigan
- Wolfson Wohl Cancer Research Centre, School of Cancer Sciences, University of Glasgow, Glasgow, G61 1QH, UK
| | - Ekaterini Himonas
- Wolfson Wohl Cancer Research Centre, School of Cancer Sciences, University of Glasgow, Glasgow, G61 1QH, UK
| | - Joe Jones
- Wolfson Wohl Cancer Research Centre, School of Cancer Sciences, University of Glasgow, Glasgow, G61 1QH, UK
| | - Daniel James
- Cancer Research UK Scotland Institute, Glasgow, G61 1BD, UK
| | | | - Mary T Scott
- Wolfson Wohl Cancer Research Centre, School of Cancer Sciences, University of Glasgow, Glasgow, G61 1QH, UK
| | - Karen Dunn
- Paul O'Gorman Leukaemia Research Centre, School of Cancer Sciences, University of Glasgow, Glasgow, G12 0ZD, UK
| | - Saverio Tardito
- Wolfson Wohl Cancer Research Centre, School of Cancer Sciences, University of Glasgow, Glasgow, G61 1QH, UK
- Cancer Research UK Scotland Institute, Glasgow, G61 1BD, UK
| | - Mhairi Copland
- Paul O'Gorman Leukaemia Research Centre, School of Cancer Sciences, University of Glasgow, Glasgow, G12 0ZD, UK
| | - David Sumpton
- Cancer Research UK Scotland Institute, Glasgow, G61 1BD, UK
| | - Emma Shanks
- Cancer Research UK Scotland Institute, Glasgow, G61 1BD, UK
| | - G Vignir Helgason
- Wolfson Wohl Cancer Research Centre, School of Cancer Sciences, University of Glasgow, Glasgow, G61 1QH, UK
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3
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Wang XB, Cui NH, Fang ZQ, Gao MJ, Cai D. Platelet bioenergetic profiling uncovers a metabolic pattern of high dependency on mitochondrial fatty acid oxidation in type 2 diabetic patients who developed in-stent restenosis. Redox Biol 2024; 72:103146. [PMID: 38579589 PMCID: PMC11000186 DOI: 10.1016/j.redox.2024.103146] [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: 03/21/2024] [Accepted: 03/31/2024] [Indexed: 04/07/2024] Open
Abstract
Although platelet bioenergetic dysfunction is evident early in the pathogenesis of diabetic macrovascular complications, the bioenergetic characteristics in type 2 diabetic patients who developed coronary in-stent restenosis (ISR) and their effects on platelet function remain unclear. Here, we performed platelet bioenergetic profiling to characterize the bioenergetic alterations in 28 type 2 diabetic patients with ISR compared with 28 type 2 diabetic patients without ISR (non-ISR) and 28 healthy individuals. Generally, platelets from type 2 diabetic patients with ISR exhibited a specific bioenergetic alteration characterized by high dependency on fatty acid (FA) oxidation, which subsequently induced complex III deficiency, causing decreased mitochondrial respiration, increased mitochondrial oxidant production, and low efficiency of mitochondrial ATP generation. This pattern of bioenergetic dysfunction showed close relationships with both α-granule and dense granule secretion as measured by surface P-selectin expression, ATP release, and profiles of granule cargo proteins in platelet releasates. Importantly, ex vivo reproduction of high dependency on FA oxidation by exposing non-ISR platelets to its agonist mimicked the bioenergetic dysfunction observed in ISR platelets and enhanced platelet secretion, whereas pharmaceutical inhibition of FA oxidation normalized the respiratory and redox states of ISR platelets and diminished platelet secretion. Further, causal mediation analyses identified a strong association between high dependency on FA oxidation and increased angiographical severity of ISR, which was significantly mediated by the status of platelet secretion. Our findings, for the first time, uncover a pattern of bioenergetic dysfunction in ISR and enhance current understanding of the mechanistic link of high dependency on FA oxidation to platelet abnormalities in the context of diabetes.
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Affiliation(s)
- Xue-Bin Wang
- Department of Clinical Laboratory, Key Clinical Laboratory of Henan Province, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450000, Henan, China.
| | - Ning-Hua Cui
- Zhengzhou Key Laboratory of Children's Infection and Immunity, Children's Hospital Affiliated to Zhengzhou University, Zhengzhou, 450000, Henan, China
| | - Zi-Qi Fang
- Department of Clinical Laboratory, Key Clinical Laboratory of Henan Province, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450000, Henan, China
| | - Mi-Jie Gao
- Department of Clinical Laboratory, Key Clinical Laboratory of Henan Province, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450000, Henan, China
| | - Dan Cai
- Department of Clinical Laboratory, Key Clinical Laboratory of Henan Province, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450000, Henan, China
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4
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Ward NP, Yoon SJ, Flynn T, Sherwood AM, Olley MA, Madej J, DeNicola GM. Mitochondrial respiratory function is preserved under cysteine starvation via glutathione catabolism in NSCLC. Nat Commun 2024; 15:4244. [PMID: 38762605 PMCID: PMC11102494 DOI: 10.1038/s41467-024-48695-2] [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: 05/05/2023] [Accepted: 05/03/2024] [Indexed: 05/20/2024] Open
Abstract
Cysteine metabolism occurs across cellular compartments to support diverse biological functions and prevent the induction of ferroptosis. Though the disruption of cytosolic cysteine metabolism is implicated in this form of cell death, it is unknown whether the substantial cysteine metabolism resident within the mitochondria is similarly pertinent to ferroptosis. Here, we show that despite the rapid depletion of intracellular cysteine upon loss of extracellular cystine, cysteine-dependent synthesis of Fe-S clusters persists in the mitochondria of lung cancer cells. This promotes a retention of respiratory function and a maintenance of the mitochondrial redox state. Under these limiting conditions, we find that glutathione catabolism by CHAC1 supports the mitochondrial cysteine pool to sustain the function of the Fe-S proteins critical to oxidative metabolism. We find that disrupting Fe-S cluster synthesis under cysteine restriction protects against the induction of ferroptosis, suggesting that the preservation of mitochondrial function is antagonistic to survival under starved conditions. Overall, our findings implicate mitochondrial cysteine metabolism in the induction of ferroptosis and reveal a mechanism of mitochondrial resilience in response to nutrient stress.
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Affiliation(s)
- Nathan P Ward
- Department of Metabolism & Physiology, Moffitt Cancer Center, Tampa, FL, USA.
| | - Sang Jun Yoon
- Department of Metabolism & Physiology, Moffitt Cancer Center, Tampa, FL, USA
| | - Tyce Flynn
- Department of Metabolism & Physiology, Moffitt Cancer Center, Tampa, FL, USA
| | - Amanda M Sherwood
- Department of Metabolism & Physiology, Moffitt Cancer Center, Tampa, FL, USA
| | - Maddison A Olley
- Department of Metabolism & Physiology, Moffitt Cancer Center, Tampa, FL, USA
| | - Juliana Madej
- Department of Metabolism & Physiology, Moffitt Cancer Center, Tampa, FL, USA
| | - Gina M DeNicola
- Department of Metabolism & Physiology, Moffitt Cancer Center, Tampa, FL, USA.
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5
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Rose HM, Ferrán B, Ranjit R, Masingale AM, Owen DB, Hussong S, Kinter MT, Galvan V, Logan S, Díaz-García CM. Mitochondrial calcium uniporter deficiency in dentate granule cells remodels neuronal metabolism and impairs reversal learning. J Neurochem 2024; 168:592-607. [PMID: 37415312 PMCID: PMC10770303 DOI: 10.1111/jnc.15901] [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: 02/28/2023] [Revised: 05/27/2023] [Accepted: 06/12/2023] [Indexed: 07/08/2023]
Abstract
The mitochondrial calcium uniporter (MCU) is the main route of calcium (Ca2+) entry into neuronal mitochondria. This channel has been linked to mitochondrial Ca2+ overload and cell death under neurotoxic conditions, but its physiologic roles for normal brain function remain poorly understood. Despite high expression of MCU in excitatory hippocampal neurons, it is unknown whether this channel is required for learning and memory. Here, we genetically down-regulated the Mcu gene in dentate granule cells (DGCs) of the hippocampus and found that this manipulation increases the overall respiratory activity of mitochondrial complexes I and II, augmenting the generation of reactive oxygen species in the context of impaired electron transport chain. The metabolic remodeling of MCU-deficient neurons also involved changes in the expression of enzymes that participate in glycolysis and the regulation of the tricarboxylic acid cycle, as well as the cellular antioxidant defenses. We found that MCU deficiency in DGCs does not change circadian rhythms, spontaneous exploratory behavior, or cognitive function in middle-aged mice (11-13 months old), when assessed with a food-motivated working memory test with three choices. DGC-targeted down-regulation of MCU significantly impairs reversal learning assessed with an 8-arm radial arm water maze but does not affect their ability to learn the task for the first time. Our results indicate that neuronal MCU plays an important physiologic role in memory formation and may be a potential therapeutic target to develop interventions aimed at improving cognitive function in aging, neurodegenerative diseases, and brain injury.
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Affiliation(s)
- Hadyn M Rose
- Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
- Center for Geroscience and Healthy Brain Aging, Oklahoma City, Oklahoma, USA
| | - Beatriz Ferrán
- Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
- Center for Geroscience and Healthy Brain Aging, Oklahoma City, Oklahoma, USA
| | - Rojina Ranjit
- Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
- Center for Geroscience and Healthy Brain Aging, Oklahoma City, Oklahoma, USA
| | - Anthony M Masingale
- Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
- Center for Geroscience and Healthy Brain Aging, Oklahoma City, Oklahoma, USA
| | - Daniel B Owen
- Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
- Center for Geroscience and Healthy Brain Aging, Oklahoma City, Oklahoma, USA
| | - Stacy Hussong
- Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
- Oklahoma City Veterans Health Care System, Oklahoma City, Oklahoma, USA
| | - Michael T Kinter
- Aging & Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, Oklahoma, USA
| | - Veronica Galvan
- Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
- Center for Geroscience and Healthy Brain Aging, Oklahoma City, Oklahoma, USA
- Oklahoma City Veterans Health Care System, Oklahoma City, Oklahoma, USA
| | - Sreemathi Logan
- Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
- Center for Geroscience and Healthy Brain Aging, Oklahoma City, Oklahoma, USA
| | - Carlos Manlio Díaz-García
- Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
- Center for Geroscience and Healthy Brain Aging, Oklahoma City, Oklahoma, USA
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6
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Schulman-Geltzer EB, Fulghum KL, Singhal RA, Hill BG, Collins HE. Cardiac mitochondrial metabolism during pregnancy and the postpartum period. Am J Physiol Heart Circ Physiol 2024; 326:H1324-H1335. [PMID: 38551485 DOI: 10.1152/ajpheart.00127.2024] [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: 02/29/2024] [Revised: 03/20/2024] [Accepted: 03/26/2024] [Indexed: 05/02/2024]
Abstract
The goal of the present study was to characterize changes in mitochondrial respiration in the maternal heart during pregnancy and after birth. Timed pregnancy studies were performed in 12-wk-old female FVB/NJ mice, and cardiac mitochondria were isolated from the following groups of mice: nonpregnant (NP), midpregnancy (MP), late pregnancy (LP), and 1-wk postbirth (PB). Similar to our previous studies, we observed increased heart size during all stages of pregnancy (e.g., MP and LP) and postbirth (e.g., PB) compared with NP mice. Differential cardiac gene and protein expression analyses revealed changes in several mitochondrial transcripts at LP and PB, including several mitochondrial complex subunits and members of the Slc family, important for mitochondrial substrate transport. Respirometry revealed that pyruvate- and glutamate-supported state 3 respiration was significantly higher in PB vs. LP mitochondria, with respiratory control ratio (RCR) values higher in PB mitochondria. In addition, we found that PB mitochondria respired more avidly when given 3-hydroxybutyrate (3-OHB) than mitochondria from NP, MP, and LP hearts, with no differences in RCR. These increases in respiration in PB hearts occurred independent of changes in mitochondrial yield but were associated with higher abundance of 3-hydroxybutyrate dehydrogenase 1. Collectively, these findings suggest that, after birth, maternal cardiac mitochondria have an increased capacity to use 3-OHB, pyruvate, and glutamate as energy sources; however, increases in mitochondrial efficiency in the postpartum heart appear limited to carbohydrate and amino acid metabolism.NEW & NOTEWORTHY Few studies have detailed the physiological adaptations that occur in the maternal heart. We and others have shown that pregnancy-induced cardiac growth is associated with significant changes in cardiac metabolism. Here, we examined mitochondrial respiration and substrate preference in isolated mitochondria from the maternal heart. We show that following birth, cardiac mitochondria are "primed" to respire on carbohydrate, amino acid, and ketone bodies. However, heightened respiratory efficiency is observed only with carbohydrate and amino acid sources. These results suggest that significant changes in mitochondrial respiration occur in the maternal heart in the postpartum period.
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Affiliation(s)
- Emily B Schulman-Geltzer
- Division of Environmental Medicine, Department of Medicine, Center for Cardiometabolic ScienceChristina Lee Brown Envirome Institute, University of Louisville, Louisville, Kentucky, United States
| | - Kyle L Fulghum
- Division of Environmental Medicine, Department of Medicine, Center for Cardiometabolic ScienceChristina Lee Brown Envirome Institute, University of Louisville, Louisville, Kentucky, United States
| | - Richa A Singhal
- Division of Environmental Medicine, Department of Medicine, Center for Cardiometabolic ScienceChristina Lee Brown Envirome Institute, University of Louisville, Louisville, Kentucky, United States
| | - Bradford G Hill
- Division of Environmental Medicine, Department of Medicine, Center for Cardiometabolic ScienceChristina Lee Brown Envirome Institute, University of Louisville, Louisville, Kentucky, United States
| | - Helen E Collins
- Division of Environmental Medicine, Department of Medicine, Center for Cardiometabolic ScienceChristina Lee Brown Envirome Institute, University of Louisville, Louisville, Kentucky, United States
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7
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Sahu U, Villa E, Reczek CR, Zhao Z, O'Hara BP, Torno MD, Mishra R, Shannon WD, Asara JM, Gao P, Shilatifard A, Chandel NS, Ben-Sahra I. Pyrimidines maintain mitochondrial pyruvate oxidation to support de novo lipogenesis. Science 2024; 383:1484-1492. [PMID: 38547260 DOI: 10.1126/science.adh2771] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Accepted: 02/20/2024] [Indexed: 04/02/2024]
Abstract
Cellular purines, particularly adenosine 5'-triphosphate (ATP), fuel many metabolic reactions, but less is known about the direct effects of pyrimidines on cellular metabolism. We found that pyrimidines, but not purines, maintain pyruvate oxidation and the tricarboxylic citric acid (TCA) cycle by regulating pyruvate dehydrogenase (PDH) activity. PDH activity requires sufficient substrates and cofactors, including thiamine pyrophosphate (TPP). Depletion of cellular pyrimidines decreased TPP synthesis, a reaction carried out by TPP kinase 1 (TPK1), which reportedly uses ATP to phosphorylate thiamine (vitamin B1). We found that uridine 5'-triphosphate (UTP) acts as the preferred substrate for TPK1, enabling cellular TPP synthesis, PDH activity, TCA-cycle activity, lipogenesis, and adipocyte differentiation. Thus, UTP is required for vitamin B1 utilization to maintain pyruvate oxidation and lipogenesis.
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Affiliation(s)
- Umakant Sahu
- Department of Biochemistry and Molecular Genetics, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
- Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, IL 60611, USA
| | - Elodie Villa
- Department of Biochemistry and Molecular Genetics, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
- Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, IL 60611, USA
| | - Colleen R Reczek
- Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, IL 60611, USA
- Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Zibo Zhao
- Department of Biochemistry and Molecular Genetics, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
- Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, IL 60611, USA
| | - Brendan P O'Hara
- Department of Biochemistry and Molecular Genetics, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
- Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, IL 60611, USA
| | - Michael D Torno
- Department of Biochemistry and Molecular Genetics, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
- Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, IL 60611, USA
| | | | | | - John M Asara
- Mass Spectrometry Core, Beth Israel Deaconess Medical Center, Department of Medicine, Harvard Medical School, Boston, MA 02115, USA
| | - Peng Gao
- Metabolomics Core Facility, Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, IL 60611, USA
| | - Ali Shilatifard
- Department of Biochemistry and Molecular Genetics, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
- Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, IL 60611, USA
| | - Navdeep S Chandel
- Department of Biochemistry and Molecular Genetics, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
- Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, IL 60611, USA
- Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Issam Ben-Sahra
- Department of Biochemistry and Molecular Genetics, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
- Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, IL 60611, USA
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8
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Sarver DC, Saqib M, Chen F, Wong GW. Mitochondrial respiration atlas reveals differential changes in mitochondrial function across sex and age. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.03.26.586781. [PMID: 38586038 PMCID: PMC10996676 DOI: 10.1101/2024.03.26.586781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/09/2024]
Abstract
Organ function declines with age, and large-scale transcriptomic analyses have highlighted differential aging trajectories across tissues. The mechanisms underlying shared and organ-selective functional changes across the lifespan, however, still remains poorly understood. Given the central role of mitochondria in powering cellular processes needed to maintain tissue health, we therefore undertook a systematic assessment of respiratory activity across 33 different tissues in young (2.5 months) and old (20 months) mice of both sexes. Our high-resolution mitochondrial respiration atlas reveals: 1) within any group of mice, mitochondrial activity varies widely across tissues, with the highest values consistently seen in heart, brown fat, and kidney; 2) biological sex is a significant but minor contributor to mitochondrial respiration, and its contributions are tissue-specific, with major differences seen in the pancreas, stomach, and white adipose tissue; 3) age is a dominant factor affecting mitochondrial activity, especially across different fat depots and skeletal muscle groups, and most brain regions; 4) age-effects can be sex- and tissue-specific, with some of the largest effects seen in pancreas, heart, adipose tissue, and skeletal muscle; and 5) while aging alters the functional trajectories of mitochondria in a majority of tissues, some are remarkably resilient to age-induced changes. Altogether, our data provide the most comprehensive compendium of mitochondrial respiration and illuminate functional signatures of aging across diverse tissues and organ systems.
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Affiliation(s)
- Dylan C. Sarver
- Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Center for Metabolism and Obesity Research, Johns Hopkins University School of Medicine, Baltimore
| | - Muzna Saqib
- Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Center for Metabolism and Obesity Research, Johns Hopkins University School of Medicine, Baltimore
| | - Fangluo Chen
- Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Center for Metabolism and Obesity Research, Johns Hopkins University School of Medicine, Baltimore
| | - G. William Wong
- Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Center for Metabolism and Obesity Research, Johns Hopkins University School of Medicine, Baltimore
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9
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Vlasveld M, Callegaro G, Fisher C, Eakins J, Walker P, Lok S, van Oost S, de Jong B, Pellegrino-Coppola D, Burger G, Wink S, van de Water B. The integrated stress response-related expression of CHOP due to mitochondrial toxicity is a warning sign for DILI liability. Liver Int 2024; 44:760-775. [PMID: 38217387 DOI: 10.1111/liv.15822] [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: 04/06/2023] [Revised: 11/29/2023] [Accepted: 12/07/2023] [Indexed: 01/15/2024]
Abstract
BACKGROUND AND AIMS Drug-induced liver injury (DILI) is one of the most frequent reasons for failure of drugs in clinical trials or market withdrawal. Early assessment of DILI risk remains a major challenge during drug development. Here, we present a mechanism-based weight-of-evidence approach able to identify certain candidate compounds with DILI liabilities due to mitochondrial toxicity. METHODS A total of 1587 FDA-approved drugs and 378 kinase inhibitors were screened for cellular stress response activation associated with DILI using an imaging-based HepG2 BAC-GFP reporter platform including the integrated stress response (CHOP), DNA damage response (P21) and oxidative stress response (SRXN1). RESULTS In total 389, 219 and 104 drugs were able to induce CHOP-GFP, P21-GFP and SRXN1-GFP expression at 50 μM respectively. Concentration response analysis identified 154 FDA-approved drugs as critical CHOP-GFP inducers. Based on predicted and observed (pre-)clinical DILI liabilities of these drugs, nine antimycotic drugs (e.g. butoconazole, miconazole, tioconazole) and 13 central nervous system (CNS) agents (e.g. duloxetine, fluoxetine) were selected for transcriptomic evaluation using whole-genome RNA-sequencing of primary human hepatocytes. Gene network analysis uncovered mitochondrial processes, NRF2 signalling and xenobiotic metabolism as most affected by the antimycotic drugs and CNS agents. Both the selected antimycotics and CNS agents caused impairment of mitochondrial oxygen consumption in both HepG2 and primary human hepatocytes. CONCLUSIONS Together, the results suggest that early pre-clinical screening for CHOP expression could indicate liability of mitochondrial toxicity in the context of DILI, and, therefore, could serve as an important warning signal to consider during decision-making in drug development.
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Affiliation(s)
- Matthijs Vlasveld
- Division of Drug Discovery and Safety, Leiden Academic Centre for Drug Research (LACDR), Leiden University, Leiden, The Netherlands
| | - Giulia Callegaro
- Division of Drug Discovery and Safety, Leiden Academic Centre for Drug Research (LACDR), Leiden University, Leiden, The Netherlands
| | | | | | | | - Samantha Lok
- Division of Drug Discovery and Safety, Leiden Academic Centre for Drug Research (LACDR), Leiden University, Leiden, The Netherlands
| | - Siddh van Oost
- Division of Drug Discovery and Safety, Leiden Academic Centre for Drug Research (LACDR), Leiden University, Leiden, The Netherlands
| | - Brechtje de Jong
- Division of Drug Discovery and Safety, Leiden Academic Centre for Drug Research (LACDR), Leiden University, Leiden, The Netherlands
| | - Damiano Pellegrino-Coppola
- Division of Drug Discovery and Safety, Leiden Academic Centre for Drug Research (LACDR), Leiden University, Leiden, The Netherlands
| | - Gerhard Burger
- Division of Drug Discovery and Safety, Leiden Academic Centre for Drug Research (LACDR), Leiden University, Leiden, The Netherlands
| | - Steven Wink
- Division of Drug Discovery and Safety, Leiden Academic Centre for Drug Research (LACDR), Leiden University, Leiden, The Netherlands
| | - Bob van de Water
- Division of Drug Discovery and Safety, Leiden Academic Centre for Drug Research (LACDR), Leiden University, Leiden, The Netherlands
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10
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Wu K, Wang B, Cao B, Ma W, Zhang Y, Cheng Y, Hu J, Gao Y. Protective role of pyrroloquinoline quinone against gentamicin induced cochlear hair cell ototoxicity. J Appl Toxicol 2024; 44:235-244. [PMID: 37650462 DOI: 10.1002/jat.4535] [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: 04/12/2023] [Revised: 08/01/2023] [Accepted: 08/14/2023] [Indexed: 09/01/2023]
Abstract
Gentamicin (GM) is one of the commonly used antibiotics in the aminoglycoside class but is ototoxic, which constantly impacts the quality of human life. Pyrroloquinoline quinone (PQQ) as a redox cofactor produced by bacteria was found in soil and foods that exert an antioxidant and redox modulator. It is well documented that the PQQ can alleviate inflammatory responses and cytotoxicity. However, our understanding of PQQ in ototoxicity remains unclear. We reported that PQQ could protect against GM-induced ototoxicity in House Ear Institute-Organ of Corti 1 (HEI-OC1) cells in vitro. To evaluate reactive oxygen species (ROS) production and mitochondrial function, ROS and JC-1 staining, oxygen consumption rate (OCR), and extracellular acidification rate (ECAR) measurements in living cells, mitochondrial dynamics analysis was performed. GM-mediated damage was performed by reducing the production of ROS and inhibiting mitochondria biogenesis and dynamics. PQQ ameliorated the cellular oxidative stress and recovered mitochondrial membrane potential, facilitating the recovery of mitochondrial biogenesis and dynamics. Our in vitro findings improve our understanding of the GM-induced ototoxicity with therapeutic implications for PQQ.
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Affiliation(s)
- Kunyi Wu
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Botao Wang
- Department of Otolaryngology, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Bo Cao
- Core Research Laboratory, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Weijun Ma
- Department of Otolaryngology, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Yan Zhang
- Department of Otolaryngology, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Ying Cheng
- Department of Otolaryngology, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Juan Hu
- Department of Otolaryngology, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Ying Gao
- Department of Otolaryngology, The Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China
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11
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Aljawrneh B, Shawakfeh K, Albiss BA, Alshanableh A, Al-Qudah MA, Bataineh TT, Shawakfeh L. A novel digitonin/graphene oxide/iron oxide nanocomposite: synthesis, physiochemical characterization and antioxidant activity. DISCOVER NANO 2024; 19:15. [PMID: 38253925 PMCID: PMC10803713 DOI: 10.1186/s11671-024-03960-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Accepted: 01/19/2024] [Indexed: 01/24/2024]
Abstract
In this work, iron oxide (Fe3O4) magnetic nanoparticles (MNPs) and graphene oxide (GO) nanosheets were prepared via the co-precipitation technique and the Modified Hummer method. Fe3O4 MNPs and GO nanosheets were combined to prepare Fe3O4/GO nanocomposite and subsequently conjugated with Digitonin (DIG) in order to obtain a dual-targeted delivery system based on DIG/Fe3O4/GO nanocomposite. SEM images reveal the presence of Fe3O4 MNPs at a scale of 100 nm, exhibiting dispersion between the GO nanosheets. Aggregation of the DIG/Fe3O4/GO nanocomposite was observed at various size scales. The XRD structural analysis confirms the crystal structure of the prepared samples. The Fe3O4 MNPs demonstrated the main XRD-diffracted peaks. Also, GO nanosheets exhibit crystalline characteristics on the (001) and (002) planes. The predominant peaks observed in the DIG/GO/Fe3O4 nanocomposite are attributed to the crystal phases of Fe3O4 MNPs. The FT-IR vibrational modes observed in the GO/DIG/Fe3O4 nanocomposite indicate the presence of crosslinking between GO nanosheet layers and the Fe3O4 MNPs. The antioxidant activity of the prepared samples was measured and the DIG/GO/Fe3O4 nanocomposite demonstrated a significantly high antioxidant activity in both 2-diphenyl-1-picrylhydrazyl (DPPH·) and 2,2-azino-bis-3-ethylbenzthiazoline-6-sulfonic acid (ABTS·+) tests.
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Affiliation(s)
- Bashar Aljawrneh
- Department of Physics, Al-Zaytoonah University of Jordan, P.O. Box 130, Amman, 11733, Jordan.
| | - Khaled Shawakfeh
- Department of Chemistry, Jordan University of Science and Technology, P.O. Box 3030, Irbid, 22110, Jordan
| | - Borhan Aldeen Albiss
- Nanotechnology Institute, Jordan University of Science and Technology, P.O. Box 3030, Irbid, 22110, Jordan
| | - Abdelelah Alshanableh
- Nanotechnology Institute, Jordan University of Science and Technology, P.O. Box 3030, Irbid, 22110, Jordan
| | - Mahmoud A Al-Qudah
- Department of Chemistry, Faculty of Science, Yarmouk University, Irbid, Jordan
| | - Tariq T Bataineh
- Department of Chemistry, Faculty of Science, Yarmouk University, Irbid, Jordan
| | - Lona Shawakfeh
- The Joint School of Nanoscience and Nanoengineering, University of North Carolina at Greensboro, Greensboro, NC, 27401, USA
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12
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Thind S, Lima D, Booy E, Trinh D, McKenna SA, Kuss S. Cytochrome c oxidase deficiency detection in human fibroblasts using scanning electrochemical microscopy. Proc Natl Acad Sci U S A 2024; 121:e2310288120. [PMID: 38154062 PMCID: PMC10769844 DOI: 10.1073/pnas.2310288120] [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: 06/20/2023] [Accepted: 11/17/2023] [Indexed: 12/30/2023] Open
Abstract
Cytochrome c oxidase deficiency (COXD) is an inherited disorder characterized by the absence or mutation in the genes encoding for the cytochrome c oxidase protein (COX). COX deficiency results in severe muscle weakness, heart, liver, and kidney disorders, as well as brain damage in infants and adolescents, leading to death in many cases. With no cure for this disorder, finding an efficient, inexpensive, and early means of diagnosis is essential to minimize symptoms and long-term disabilities. Furthermore, muscle biopsy, the traditional detection method, is invasive, expensive, and time-consuming. This study demonstrates the applicability of scanning electrochemical microscopy to quantify COX activity in living human fibroblast cells. Taking advantage of the interaction between the redox mediator N, N, N', N'-tetramethyl-para-phenylene-diamine, and COX, the enzymatic activity was successfully quantified by monitoring current changes using a platinum microelectrode and determining the apparent heterogeneous rate constant k0 using numerical modeling. This study provides a foundation for developing a diagnostic method for detecting COXD in infants, which has the potential to increase treatment effectiveness and improve the quality of life of affected individuals.
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Affiliation(s)
- Shubhneet Thind
- Laboratory for Bioanalytics and Electrochemical Sensing, Department of Chemistry, University of Manitoba, Winnipeg, MBR3T 2N2, Canada
| | - Dhésmon Lima
- Laboratory for Bioanalytics and Electrochemical Sensing, Department of Chemistry, University of Manitoba, Winnipeg, MBR3T 2N2, Canada
| | - Evan Booy
- Department of Chemistry, University of Manitoba, Winnipeg, MBR3T 2N2, Canada
| | - Dao Trinh
- Laboratoire des Sciences de l’Ingénieur Pour l’Environnement, UMR CNRS 7356, Université de La Rochelle, Pôle Sciences et Technologie17042, La Rochelle, Cedex 1, France
| | - Sean A. McKenna
- Department of Chemistry, University of Manitoba, Winnipeg, MBR3T 2N2, Canada
| | - Sabine Kuss
- Laboratory for Bioanalytics and Electrochemical Sensing, Department of Chemistry, University of Manitoba, Winnipeg, MBR3T 2N2, Canada
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13
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DeMambro VE, Tian L, Karthik V, Rosen CJ, Guntur AR. Effects of PTH on osteoblast bioenergetics in response to glucose. Bone Rep 2023; 19:101705. [PMID: 37576927 PMCID: PMC10412867 DOI: 10.1016/j.bonr.2023.101705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 05/29/2023] [Accepted: 07/13/2023] [Indexed: 08/15/2023] Open
Abstract
Parathyroid hormone acts through its receptor, PTHR1, expressed on osteoblasts, to control bone remodeling. Metabolic flexibility for energy generation has been demonstrated in several cell types dependent on substrate availability. Recent studies have identified a critical role for PTH in regulating glucose, fatty acid and amino acid metabolism thus stimulating both glycolysis and oxidative phosphorylation. Therefore, we postulated that PTH stimulates increased energetic output by osteoblasts either by increasing glycolysis or oxidative phosphorylation depending on substrate availability. To test this hypothesis, undifferentiated and differentiated MC3T3E1C4 calvarial pre-osteoblasts were treated with PTH to study osteoblast bioenergetics in the presence of exogenous glucose. Significant increases in glycolysis with acute ∼1 h PTH treatment with minimal effects on oxidative phosphorylation in undifferentiated MC3T3E1C4 in the presence of exogenous glucose were observed. In differentiated cells, the increased glycolysis observed with acute PTH was completely blocked by pretreatment with a Glut1 inhibitor (BAY-876) resulting in a compensatory increase in oxidative phosphorylation. We then tested the effect of PTH on the function of complexes I and II of the mitochondrial electron transport chain in the absence of glycolysis. Utilizing a novel cell plasma membrane permeability mitochondrial (PMP) assay, in combination with complex I and II specific substrates, slight but significant increases in basal and maximal oxygen consumption rates with 24 h PTH treatment in undifferentiated MC3T3E1C4 cells were noted. Taken together, our data demonstrate for the first time that PTH stimulates both increases in glycolysis and the function of the electron transport chain, particularly complexes I and II, during high energy demands in osteoblasts.
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Affiliation(s)
- Victoria E. DeMambro
- Center for Molecular Medicine, MaineHealth Institute for Research, Scarborough, ME, USA
- Graduate School of Biomedical Sciences and Engineering, University of Maine, Orono, ME, USA
| | - Li Tian
- Center for Molecular Medicine, MaineHealth Institute for Research, Scarborough, ME, USA
| | - Vivin Karthik
- Graduate School of Biomedical Sciences and Engineering, University of Maine, Orono, ME, USA
| | - Clifford J. Rosen
- Center for Molecular Medicine, MaineHealth Institute for Research, Scarborough, ME, USA
- Tufts University School of Medicine, Tufts University, Boston, MA, USA
- Graduate School of Biomedical Sciences and Engineering, University of Maine, Orono, ME, USA
| | - Anyonya R. Guntur
- Center for Molecular Medicine, MaineHealth Institute for Research, Scarborough, ME, USA
- Tufts University School of Medicine, Tufts University, Boston, MA, USA
- Graduate School of Biomedical Sciences and Engineering, University of Maine, Orono, ME, USA
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14
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Guhathakurta S, Erdogdu NU, Hoffmann JJ, Grzadzielewska I, Schendzielorz A, Seyfferth J, Mårtensson CU, Corrado M, Karoutas A, Warscheid B, Pfanner N, Becker T, Akhtar A. COX17 acetylation via MOF-KANSL complex promotes mitochondrial integrity and function. Nat Metab 2023; 5:1931-1952. [PMID: 37813994 PMCID: PMC10663164 DOI: 10.1038/s42255-023-00904-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2023] [Accepted: 09/06/2023] [Indexed: 10/11/2023]
Abstract
Reversible acetylation of mitochondrial proteins is a regulatory mechanism central to adaptive metabolic responses. Yet, how such functionally relevant protein acetylation is achieved remains unexplored. Here we reveal an unprecedented role of the MYST family lysine acetyltransferase MOF in energy metabolism via mitochondrial protein acetylation. Loss of MOF-KANSL complex members leads to mitochondrial defects including fragmentation, reduced cristae density and impaired mitochondrial electron transport chain complex IV integrity in primary mouse embryonic fibroblasts. We demonstrate COX17, a complex IV assembly factor, as a bona fide acetylation target of MOF. Loss of COX17 or expression of its non-acetylatable mutant phenocopies the mitochondrial defects observed upon MOF depletion. The acetylation-mimetic COX17 rescues these defects and maintains complex IV activity even in the absence of MOF, suggesting an activatory role of mitochondrial electron transport chain protein acetylation. Fibroblasts from patients with MOF syndrome who have intellectual disability also revealed respiratory defects that could be restored by alternative oxidase, acetylation-mimetic COX17 or mitochondrially targeted MOF. Overall, our findings highlight the critical role of MOF-KANSL complex in mitochondrial physiology and provide new insights into MOF syndrome.
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Affiliation(s)
- Sukanya Guhathakurta
- Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany
- Faculty of Biology, University of Freiburg, Freiburg, Germany
| | - Niyazi Umut Erdogdu
- Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany
- Faculty of Biology, University of Freiburg, Freiburg, Germany
| | - Juliane J Hoffmann
- Institute of Biochemistry and Molecular Biology, Faculty of Medicine, University of Bonn, Bonn, Germany
| | - Iga Grzadzielewska
- Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany
- Faculty of Biology, University of Freiburg, Freiburg, Germany
| | | | - Janine Seyfferth
- Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany
| | - Christoph U Mårtensson
- Institute of Biochemistry and Molecular Biology, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Mauro Corrado
- Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases, University of Cologne, Cologne, Germany
- Center for Molecular Medicine Cologne (CMMC), University of Cologne, Cologne, Germany
- Institute for Genetics, University of Cologne, Cologne, Germany
| | - Adam Karoutas
- Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany
- Faculty of Biology, University of Freiburg, Freiburg, Germany
| | - Bettina Warscheid
- Institute of Biology II, Faculty of Biology, University of Freiburg, Freiburg, Germany
- Signaling Research Centers BIOSS and CIBSS, University of Freiburg, Freiburg, Germany
- Theodor Boveri-Institute, University of Würzburg, Würzburg, Germany
| | - Nikolaus Pfanner
- Institute of Biochemistry and Molecular Biology, Faculty of Medicine, University of Freiburg, Freiburg, Germany
- Signaling Research Centers BIOSS and CIBSS, University of Freiburg, Freiburg, Germany
| | - Thomas Becker
- Institute of Biochemistry and Molecular Biology, Faculty of Medicine, University of Bonn, Bonn, Germany
| | - Asifa Akhtar
- Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany.
- Signaling Research Centers BIOSS and CIBSS, University of Freiburg, Freiburg, Germany.
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15
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Kramer NJ, Prakash G, Isaac RS, Choquet K, Soto I, Petrova B, Merens HE, Kanarek N, Churchman LS. Regulators of mitonuclear balance link mitochondrial metabolism to mtDNA expression. Nat Cell Biol 2023; 25:1575-1589. [PMID: 37770567 DOI: 10.1038/s41556-023-01244-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Accepted: 08/29/2023] [Indexed: 09/30/2023]
Abstract
Mitochondrial oxidative phosphorylation (OXPHOS) complexes are assembled from proteins encoded by both nuclear and mitochondrial DNA. These dual-origin enzymes pose a complex gene regulatory challenge for cells requiring coordinated gene expression across organelles. To identify genes involved in dual-origin protein complex synthesis, we performed fluorescence-activated cell-sorting-based genome-wide screens analysing mutant cells with unbalanced levels of mitochondrial- and nuclear-encoded subunits of Complex IV. We identified genes involved in OXPHOS biogenesis, including two uncharacterized genes: PREPL and NME6. We found that PREPL specifically impacts Complex IV biogenesis by acting at the intersection of mitochondrial lipid metabolism and protein synthesis, whereas NME6, an uncharacterized nucleoside diphosphate kinase, controls OXPHOS biogenesis through multiple mechanisms reliant on its NDPK domain. Firstly, NME6 forms a complex with RCC1L, which together perform nucleoside diphosphate kinase activity to maintain local mitochondrial pyrimidine triphosphate levels essential for mitochondrial RNA abundance. Secondly, NME6 modulates the activity of mitoribosome regulatory complexes, altering mitoribosome assembly and mitochondrial RNA pseudouridylation. Taken together, we propose that NME6 acts as a link between compartmentalized mitochondrial metabolites and mitochondrial gene expression.
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Affiliation(s)
- Nicholas J Kramer
- Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA, USA
| | - Gyan Prakash
- Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA, USA
| | - R Stefan Isaac
- Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA, USA
| | - Karine Choquet
- Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA, USA
| | - Iliana Soto
- Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA, USA
| | - Boryana Petrova
- Department of Pathology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
| | - Hope E Merens
- Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA, USA
| | - Naama Kanarek
- Department of Pathology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
| | - L Stirling Churchman
- Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA, USA.
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16
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den Toom WTF, van Soest DMK, Polderman PE, van Triest MH, Bruurs LJM, De Henau S, Burgering BMT, Dansen TB. Oxygen-consumption based quantification of chemogenetic H 2O 2 production in live human cells. Free Radic Biol Med 2023; 206:134-142. [PMID: 37392950 DOI: 10.1016/j.freeradbiomed.2023.06.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 06/18/2023] [Accepted: 06/26/2023] [Indexed: 07/03/2023]
Abstract
Reactive Oxygen Species (ROS) in the form of H2O2 can act both as physiological signaling molecules as well as damaging agents, depending on their concentration and localization. The downstream biological effects of H2O2 were often studied making use of exogenously added H2O2, generally as a bolus and at supraphysiological levels. But this does not mimic the continuous, low levels of intracellular H2O2 production by for instance mitochondrial respiration. The enzyme d-Amino Acid Oxidase (DAAO) catalyzes H2O2 formation using d-amino acids, which are absent from culture media, as a substrate. Ectopic expression of DAAO has recently been used in several studies to produce inducible and titratable intracellular H2O2. However, a method to directly quantify the amount of H2O2 produced by DAAO has been lacking, making it difficult to assess whether observed phenotypes are the result of physiological or artificially high levels of H2O2. Here we describe a simple assay to directly quantify DAAO activity by measuring the oxygen consumed during H2O2 production. The oxygen consumption rate (OCR) of DAAO can directly be compared to the basal mitochondrial respiration in the same assay, to estimate whether the ensuing level of H2O2 production is within the range of physiological mitochondrial ROS production. In the tested monoclonal RPE1-hTERT cells, addition of 5 mM d-Ala to the culture media amounts to a DAAO-dependent OCR that surpasses ∼5% of the OCR that stems from basal mitochondrial respiration and hence produces supra-physiological levels of H2O2. We show that the assay can also be used to select clones that express differentially localized DAAO with the same absolute level of H2O2 production to be able to discriminate the effects of H2O2 production at different subcellular locations from differences in total oxidative burden. This method therefore greatly improves the interpretation and applicability of DAAO-based models, thereby moving the redox biology field forward.
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Affiliation(s)
- Wytze T F den Toom
- Center for Molecular Medicine, University Medical Center Utrecht, Universiteitsweg 100, 3584 CG, Utrecht, the Netherlands
| | - Daan M K van Soest
- Center for Molecular Medicine, University Medical Center Utrecht, Universiteitsweg 100, 3584 CG, Utrecht, the Netherlands
| | - Paulien E Polderman
- Center for Molecular Medicine, University Medical Center Utrecht, Universiteitsweg 100, 3584 CG, Utrecht, the Netherlands
| | - Miranda H van Triest
- Center for Molecular Medicine, University Medical Center Utrecht, Universiteitsweg 100, 3584 CG, Utrecht, the Netherlands
| | - Lucas J M Bruurs
- Center for Molecular Medicine, University Medical Center Utrecht, Universiteitsweg 100, 3584 CG, Utrecht, the Netherlands
| | - Sasha De Henau
- Center for Molecular Medicine, University Medical Center Utrecht, Universiteitsweg 100, 3584 CG, Utrecht, the Netherlands
| | - Boudewijn M T Burgering
- Center for Molecular Medicine, University Medical Center Utrecht, Universiteitsweg 100, 3584 CG, Utrecht, the Netherlands; Oncode Institute, Jaarbeursplein 6, 3521 AL, Utrecht, the Netherlands
| | - Tobias B Dansen
- Center for Molecular Medicine, University Medical Center Utrecht, Universiteitsweg 100, 3584 CG, Utrecht, the Netherlands.
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17
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Palmieri EM, Holewinski R, McGinity CL, Pierri CL, Maio N, Weiss JM, Tragni V, Miranda KM, Rouault TA, Andresson T, Wink DA, McVicar DW. Pyruvate dehydrogenase operates as an intramolecular nitroxyl generator during macrophage metabolic reprogramming. Nat Commun 2023; 14:5114. [PMID: 37607904 PMCID: PMC10444860 DOI: 10.1038/s41467-023-40738-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Accepted: 08/04/2023] [Indexed: 08/24/2023] Open
Abstract
M1 macrophages enter a glycolytic state when endogenous nitric oxide (NO) reprograms mitochondrial metabolism by limiting aconitase 2 and pyruvate dehydrogenase (PDH) activity. Here, we provide evidence that NO targets the PDH complex by using lipoate to generate nitroxyl (HNO). PDH E2-associated lipoate is modified in NO-rich macrophages while the PDH E3 enzyme, also known as dihydrolipoamide dehydrogenase (DLD), is irreversibly inhibited. Mechanistically, we show that lipoate facilitates NO-mediated production of HNO, which interacts with thiols forming irreversible modifications including sulfinamide. In addition, we reveal a macrophage signature of proteins with reduction-resistant modifications, including in DLD, and identify potential HNO targets. Consistently, DLD enzyme is modified in an HNO-dependent manner at Cys477 and Cys484, and molecular modeling and mutagenesis show these modifications impair the formation of DLD homodimers. In conclusion, our work demonstrates that HNO is produced physiologically. Moreover, the production of HNO is dependent on the lipoate-rich PDH complex facilitating irreversible modifications that are critical to NO-dependent metabolic rewiring.
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Affiliation(s)
- Erika M Palmieri
- Cancer Innovation Laboratory, NCI-Frederick, Frederick, MD, 21702, USA
| | - Ronald Holewinski
- Protein Characterization Laboratory, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD, 21702, USA
| | | | - Ciro L Pierri
- Laboratory of Biochemistry, Molecular and Structural Biology, Department of Pharmacy-Pharmaceutical Sciences, University of Bari, Via E. Orabona, 4, Bari, 70125, Italy
| | - Nunziata Maio
- Molecular Medicine Branch, Eunice Kennedy Shriver National Institute of Child Health and Human Development, 9000 Rockville Pike, Bethesda, MD, 20892, USA
| | - Jonathan M Weiss
- Cancer Innovation Laboratory, NCI-Frederick, Frederick, MD, 21702, USA
| | - Vincenzo Tragni
- Laboratory of Biochemistry, Molecular and Structural Biology, Department of Pharmacy-Pharmaceutical Sciences, University of Bari, Via E. Orabona, 4, Bari, 70125, Italy
| | - Katrina M Miranda
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ, 85721, USA
| | - Tracey A Rouault
- Molecular Medicine Branch, Eunice Kennedy Shriver National Institute of Child Health and Human Development, 9000 Rockville Pike, Bethesda, MD, 20892, USA
| | - Thorkell Andresson
- Protein Characterization Laboratory, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD, 21702, USA
| | - David A Wink
- Cancer Innovation Laboratory, NCI-Frederick, Frederick, MD, 21702, USA
| | - Daniel W McVicar
- Cancer Innovation Laboratory, NCI-Frederick, Frederick, MD, 21702, USA.
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18
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Zhang X, Shan G, Li N, Chen J, Ji C, Li X, Jiang L, Lee TKW, Keng VW, Zhao Y. An autophagy-inducing stapled peptide induces mitochondria dysfunction and triggers autotic cell death in triple-negative breast cancer. Cell Death Discov 2023; 9:303. [PMID: 37598181 PMCID: PMC10439894 DOI: 10.1038/s41420-023-01600-0] [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: 11/25/2022] [Revised: 07/06/2023] [Accepted: 08/10/2023] [Indexed: 08/21/2023] Open
Abstract
Autophagy is a lysosome-dependent bulk degradation process essential for cell viability but excessive autophagy leads to a unique form of cell death termed autosis. Triple-negative breast cancer (TNBC) is a highly aggressive subtype of breast cancer with notable defect in its autophagy process. In previous studies, we developed stapled peptides that specifically targeted the essential autophagy protein Beclin 1 to induce autophagy and promote endolysosomal trafficking. Here we show that one lead peptide Tat-SP4 induced mild increase of autophagy in TNBC cells but showed potent anti-proliferative effect that could not be rescued by inhibitors of programmed cell death pathways. The cell death induced by Tat-SP4 showed typical features of autosis including sustained adherence to the substrate surface, rupture of plasma membrane and effective rescue by digoxin, a cardioglycoside that blocks the Na+/K+ ATPase. Tat-SP4 also induced prominent mitochondria dysfunction including loss of mitochondria membrane potential, elevated mitochondria reactive oxygen species and reduced oxidative phosphorylation. The anti-proliferative effect of Tat-SP4 was confirmed in a TNBC xenograft model. Our study uncovers three notable aspects of autosis. Firstly, autosis can be triggered by moderate increase in autophagy if such increase exceeds the endogenous capacity of the host cells. Secondly, mitochondria may play an essential role in autosis with dysregulated autophagy leading to mitochondria dysfunction to trigger autosis. Lastly, intrinsic autophagy deficiency and quiescent mitochondria bioenergetic profile likely render TNBC cells particularly susceptible to autosis. Our designed peptides like Tat-SP4 may serve as potential therapeutic candidates against TNBC by targeting this vulnerability.
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Affiliation(s)
- Xiaozhe Zhang
- Department of Applied Biology and Chemical Technology, State Key Laboratory of Chemical Biology and Drug Discovery, The Hong Kong Polytechnic University, Hung Hom, Kowloon, 999077, Hong Kong, P. R. China
| | - Gao Shan
- Department of Applied Biology and Chemical Technology, State Key Laboratory of Chemical Biology and Drug Discovery, The Hong Kong Polytechnic University, Hung Hom, Kowloon, 999077, Hong Kong, P. R. China
| | - Na Li
- The Hong Kong Polytechnic University Shenzhen Research Institute, 518057, Shenzhen, P. R. China
| | - Jingyi Chen
- Department of Applied Biology and Chemical Technology, State Key Laboratory of Chemical Biology and Drug Discovery, The Hong Kong Polytechnic University, Hung Hom, Kowloon, 999077, Hong Kong, P. R. China
| | - Changyang Ji
- School of Life Sciences, Centre for Cell & Developmental Biology, State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Xiaoxiao Li
- The Hong Kong Polytechnic University Shenzhen Research Institute, 518057, Shenzhen, P. R. China
| | - Liwen Jiang
- School of Life Sciences, Centre for Cell & Developmental Biology, State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Terence Kin Wah Lee
- Department of Applied Biology and Chemical Technology, State Key Laboratory of Chemical Biology and Drug Discovery, The Hong Kong Polytechnic University, Hung Hom, Kowloon, 999077, Hong Kong, P. R. China
| | - Vincent W Keng
- Department of Applied Biology and Chemical Technology, State Key Laboratory of Chemical Biology and Drug Discovery, The Hong Kong Polytechnic University, Hung Hom, Kowloon, 999077, Hong Kong, P. R. China
| | - Yanxiang Zhao
- Department of Applied Biology and Chemical Technology, State Key Laboratory of Chemical Biology and Drug Discovery, The Hong Kong Polytechnic University, Hung Hom, Kowloon, 999077, Hong Kong, P. R. China.
- The Hong Kong Polytechnic University Shenzhen Research Institute, 518057, Shenzhen, P. R. China.
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19
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Frank AR, Li V, Shelton SD, Kim J, Stott GM, Neckers LM, Xie Y, Williams NS, Mishra P, McFadden DG. Mitochondrial-Encoded Complex I Impairment Induces a Targetable Dependency on Aerobic Fermentation in Hürthle Cell Carcinoma of the Thyroid. Cancer Discov 2023; 13:1884-1903. [PMID: 37262072 PMCID: PMC10524862 DOI: 10.1158/2159-8290.cd-22-0982] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 02/20/2023] [Accepted: 05/08/2023] [Indexed: 06/03/2023]
Abstract
A metabolic hallmark of cancer identified by Warburg is the increased consumption of glucose and secretion of lactate, even in the presence of oxygen. Although many tumors exhibit increased glycolytic activity, most forms of cancer rely on mitochondrial respiration for tumor growth. We report here that Hürthle cell carcinoma of the thyroid (HTC) models harboring mitochondrial DNA-encoded defects in complex I of the mitochondrial electron transport chain exhibit impaired respiration and alterations in glucose metabolism. CRISPR-Cas9 pooled screening identified glycolytic enzymes as selectively essential in complex I-mutant HTC cells. We demonstrate in cultured cells and a patient-derived xenograft model that small-molecule inhibitors of lactate dehydrogenase selectively induce an ATP crisis and cell death in HTC. This work demonstrates that complex I loss exposes fermentation as a therapeutic target in HTC and has implications for other tumors bearing mutations that irreversibly damage mitochondrial respiration. SIGNIFICANCE HTC is enriched in somatic mtDNA mutations predicted to affect complex I of the electron transport chain (ETC). We demonstrate that these mutations impair respiration and induce a therapeutically tractable reliance on aerobic fermentation for cell survival. This work provides a rationale for targeting fermentation in cancers harboring irreversible genetically encoded ETC defects. See related article by Gopal et al., p. 1904. This article is highlighted in the In This Issue feature, p. 1749.
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Affiliation(s)
- Anderson R Frank
- Department of Internal Medicine, Division of Endocrinology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
- Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Vicky Li
- Department of Internal Medicine, Division of Endocrinology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
- Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Spencer D Shelton
- Children’s Medical Center Research Institute, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Jiwoong Kim
- Department of Population and Data Sciences, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Gordon M Stott
- Leidos Biomedical Research Inc., Frederick National Laboratory for Cancer Research, Frederick, MD 24060, USA
| | - Leonard M Neckers
- Urologic Oncology Branch, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA
| | - Yang Xie
- Department of Population and Data Sciences, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Noelle S Williams
- Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Prashant Mishra
- Children’s Medical Center Research Institute, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
- Harold C. Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
- Deparment of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - David G McFadden
- Department of Internal Medicine, Division of Endocrinology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
- Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
- Harold C. Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
- Program in Molecular Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
- Lead contact
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20
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Hardy RE, Chung I, Yu Y, Loh SHY, Morone N, Soleilhavoup C, Travaglio M, Serreli R, Panman L, Cain K, Hirst J, Martins LM, MacFarlane M, Pryde KR. The antipsychotic medications aripiprazole, brexpiprazole and cariprazine are off-target respiratory chain complex I inhibitors. Biol Direct 2023; 18:43. [PMID: 37528429 PMCID: PMC10391878 DOI: 10.1186/s13062-023-00375-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Accepted: 04/11/2023] [Indexed: 08/03/2023] Open
Abstract
Antipsychotic drugs are the mainstay of treatment for schizophrenia and provide adjunct therapies for other prevalent psychiatric conditions, including bipolar disorder and major depressive disorder. However, they also induce debilitating extrapyramidal syndromes (EPS), such as Parkinsonism, in a significant minority of patients. The majority of antipsychotic drugs function as dopamine receptor antagonists in the brain while the most recent 'third'-generation, such as aripiprazole, act as partial agonists. Despite showing good clinical efficacy, these newer agents are still associated with EPS in ~ 5 to 15% of patients. However, it is not fully understood how these movement disorders develop. Here, we combine clinically-relevant drug concentrations with mutliscale model systems to show that aripiprazole and its primary active metabolite induce mitochondrial toxicity inducing robust declines in cellular ATP and viability. Aripiprazole, brexpiprazole and cariprazine were shown to directly inhibit respiratory complex I through its ubiquinone-binding channel. Importantly, all three drugs induced mitochondrial toxicity in primary embryonic mouse neurons, with greater bioenergetic inhibition in ventral midbrain neurons than forebrain neurons. Finally, chronic feeding with aripiprazole resulted in structural damage to mitochondria in the brain and thoracic muscle of adult Drosophila melanogaster consistent with locomotor dysfunction. Taken together, we show that antipsychotic drugs acting as partial dopamine receptor agonists exhibit off-target mitochondrial liabilities targeting complex I.
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Affiliation(s)
- Rachel E Hardy
- MRC Toxicology Unit, University of Cambridge, Gleeson Building, Tennis Court Road, Cambridge, CB2 1QR, UK
| | - Injae Chung
- MRC Mitochondrial Biology Unit, University of Cambridge, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge, CB2 0XY, UK
| | - Yizhou Yu
- MRC Toxicology Unit, University of Cambridge, Gleeson Building, Tennis Court Road, Cambridge, CB2 1QR, UK
| | - Samantha H Y Loh
- MRC Toxicology Unit, University of Cambridge, Gleeson Building, Tennis Court Road, Cambridge, CB2 1QR, UK
| | - Nobuhiro Morone
- MRC Toxicology Unit, University of Cambridge, Gleeson Building, Tennis Court Road, Cambridge, CB2 1QR, UK
| | - Clement Soleilhavoup
- MRC Toxicology Unit, University of Cambridge, Gleeson Building, Tennis Court Road, Cambridge, CB2 1QR, UK
| | - Marco Travaglio
- MRC Toxicology Unit, University of Cambridge, Gleeson Building, Tennis Court Road, Cambridge, CB2 1QR, UK
| | - Riccardo Serreli
- MRC Mitochondrial Biology Unit, University of Cambridge, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge, CB2 0XY, UK
| | - Lia Panman
- MRC Toxicology Unit, University of Cambridge, Gleeson Building, Tennis Court Road, Cambridge, CB2 1QR, UK
| | - Kelvin Cain
- MRC Toxicology Unit, University of Cambridge, Gleeson Building, Tennis Court Road, Cambridge, CB2 1QR, UK
| | - Judy Hirst
- MRC Mitochondrial Biology Unit, University of Cambridge, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge, CB2 0XY, UK
| | - Luis M Martins
- MRC Toxicology Unit, University of Cambridge, Gleeson Building, Tennis Court Road, Cambridge, CB2 1QR, UK.
| | - Marion MacFarlane
- MRC Toxicology Unit, University of Cambridge, Gleeson Building, Tennis Court Road, Cambridge, CB2 1QR, UK.
| | - Kenneth R Pryde
- MRC Toxicology Unit, University of Cambridge, Gleeson Building, Tennis Court Road, Cambridge, CB2 1QR, UK.
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21
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Haus ES, Drengstig T, Thorsen K. Structural identifiability of biomolecular controller motifs with and without flow measurements as model output. PLoS Comput Biol 2023; 19:e1011398. [PMID: 37639454 PMCID: PMC10491402 DOI: 10.1371/journal.pcbi.1011398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 09/08/2023] [Accepted: 07/28/2023] [Indexed: 08/31/2023] Open
Abstract
Controller motifs are simple biomolecular reaction networks with negative feedback. They can explain how regulatory function is achieved and are often used as building blocks in mathematical models of biological systems. In this paper we perform an extensive investigation into structural identifiability of controller motifs, specifically the so-called basic and antithetic controller motifs. Structural identifiability analysis is a useful tool in the creation and evaluation of mathematical models: it can be used to ensure that model parameters can be determined uniquely and to examine which measurements are necessary for this purpose. This is especially useful for biological models where parameter estimation can be difficult due to limited availability of measureable outputs. Our aim with this work is to investigate how structural identifiability is affected by controller motif complexity and choice of measurements. To increase the number of potential outputs we propose two methods for including flow measurements and show how this affects structural identifiability in combination with, or in the absence of, concentration measurements. In our investigation, we analyze 128 different controller motif structures using a combination of flow and/or concentration measurements, giving a total of 3648 instances. Among all instances, 34% of the measurement combinations provided structural identifiability. Our main findings for the controller motifs include: i) a single measurement is insufficient for structural identifiability, ii) measurements related to different chemical species are necessary for structural identifiability. Applying these findings result in a reduced subset of 1568 instances, where 80% are structurally identifiable, and more complex/interconnected motifs appear easier to structurally identify. The model structures we have investigated are commonly used in models of biological systems, and our results demonstrate how different model structures and measurement combinations affect structural identifiability of controller motifs.
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Affiliation(s)
- Eivind S. Haus
- Department of Electrical Engineering and Computer Science, University of Stavanger, Stavanger, Norway
| | - Tormod Drengstig
- Department of Electrical Engineering and Computer Science, University of Stavanger, Stavanger, Norway
| | - Kristian Thorsen
- Department of Electrical Engineering and Computer Science, University of Stavanger, Stavanger, Norway
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22
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Mendez Garcia MF, Matsuzaki S, Batushansky A, Newhardt R, Kinter C, Jin Y, Mann SN, Stout MB, Gu H, Chiao YA, Kinter M, Humphries KM. Increased cardiac PFK-2 protects against high-fat diet-induced cardiomyopathy and mediates beneficial systemic metabolic effects. iScience 2023; 26:107131. [PMID: 37534142 PMCID: PMC10391959 DOI: 10.1016/j.isci.2023.107131] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 04/27/2023] [Accepted: 06/10/2023] [Indexed: 08/04/2023] Open
Abstract
A healthy heart adapts to changes in nutrient availability and energy demands. In metabolic diseases like type 2 diabetes (T2D), increased reliance on fatty acids for energy production contributes to mitochondrial dysfunction and cardiomyopathy. A principal regulator of cardiac metabolism is 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase (PFK-2), which is a central driver of glycolysis. We hypothesized that increasing PFK-2 activity could mitigate cardiac dysfunction induced by high-fat diet (HFD). Wild type (WT) and cardiac-specific transgenic mice expressing PFK-2 (GlycoHi) were fed a low fat or HFD for 16 weeks to induce metabolic dysfunction. Metabolic phenotypes were determined by measuring mitochondrial bioenergetics and performing targeted quantitative proteomic and metabolomic analysis. Increasing cardiac PFK-2 had beneficial effects on cardiac and mitochondrial function. Unexpectedly, GlycoHi mice also exhibited sex-dependent systemic protection from HFD, including increased glucose homeostasis. These findings support improving glycolysis via PFK-2 activity can mitigate mitochondrial and functional changes that occur with metabolic syndrome.
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Affiliation(s)
- Maria F. Mendez Garcia
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
- Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Satoshi Matsuzaki
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
| | - Albert Batushansky
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
- Ilse Katz Institute for Nanoscale Science & Technology, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Ryan Newhardt
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
| | - Caroline Kinter
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
| | - Yan Jin
- Center for Translational Science, Florida International University, Port St. Lucie, FL, USA
| | - Shivani N. Mann
- Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Michael B. Stout
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
| | - Haiwei Gu
- Center for Translational Science, Florida International University, Port St. Lucie, FL, USA
| | - Ying Ann Chiao
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
| | - Michael Kinter
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
| | - Kenneth M. Humphries
- Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
- Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
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23
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Rickard BP, Overchuk M, Chappell VA, Kemal Ruhi M, Sinawang PD, Nguyen Hoang TT, Akin D, Demirci U, Franco W, Fenton SE, Santos JH, Rizvi I. Methods to Evaluate Changes in Mitochondrial Structure and Function in Cancer. Cancers (Basel) 2023; 15:2564. [PMID: 37174030 PMCID: PMC10177605 DOI: 10.3390/cancers15092564] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 04/25/2023] [Accepted: 04/26/2023] [Indexed: 05/15/2023] Open
Abstract
Mitochondria are regulators of key cellular processes, including energy production and redox homeostasis. Mitochondrial dysfunction is associated with various human diseases, including cancer. Importantly, both structural and functional changes can alter mitochondrial function. Morphologic and quantifiable changes in mitochondria can affect their function and contribute to disease. Structural mitochondrial changes include alterations in cristae morphology, mitochondrial DNA integrity and quantity, and dynamics, such as fission and fusion. Functional parameters related to mitochondrial biology include the production of reactive oxygen species, bioenergetic capacity, calcium retention, and membrane potential. Although these parameters can occur independently of one another, changes in mitochondrial structure and function are often interrelated. Thus, evaluating changes in both mitochondrial structure and function is crucial to understanding the molecular events involved in disease onset and progression. This review focuses on the relationship between alterations in mitochondrial structure and function and cancer, with a particular emphasis on gynecologic malignancies. Selecting methods with tractable parameters may be critical to identifying and targeting mitochondria-related therapeutic options. Methods to measure changes in mitochondrial structure and function, with the associated benefits and limitations, are summarized.
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Affiliation(s)
- Brittany P. Rickard
- Curriculum in Toxicology & Environmental Medicine, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Marta Overchuk
- Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill, Chapel Hill, NC, and North Carolina State University, Raleigh, NC 27695, USA
| | - Vesna A. Chappell
- Mechanistic Toxicology Branch, Division of Translational Toxicology, National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709, USA
| | - Mustafa Kemal Ruhi
- Institute of Biomedical Engineering, Boğaziçi University, Istanbul 34684, Turkey
| | - Prima Dewi Sinawang
- Canary Center at Stanford for Cancer Early Detection, Department of Radiology, School of Medicine, Palo Alto, CA 94304, USA
- Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA
| | - Tina Thuy Nguyen Hoang
- Department of Biomedical Engineering, University of Massachusetts Lowell, Lowell, MA 01854, USA
| | - Demir Akin
- Canary Center at Stanford for Cancer Early Detection, Department of Radiology, School of Medicine, Palo Alto, CA 94304, USA
- Center for Cancer Nanotechnology Excellence for Translational Diagnostics (CCNE-TD), School of Medicine, Stanford University, Stanford, CA 94305, USA
| | - Utkan Demirci
- Canary Center at Stanford for Cancer Early Detection, Department of Radiology, School of Medicine, Palo Alto, CA 94304, USA
| | - Walfre Franco
- Department of Biomedical Engineering, University of Massachusetts Lowell, Lowell, MA 01854, USA
| | - Suzanne E. Fenton
- Mechanistic Toxicology Branch, Division of Translational Toxicology, National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709, USA
| | - Janine H. Santos
- Mechanistic Toxicology Branch, Division of Translational Toxicology, National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709, USA
| | - Imran Rizvi
- Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill, Chapel Hill, NC, and North Carolina State University, Raleigh, NC 27695, USA
- Lineberger Comprehensive Cancer Center, University of North Carolina School of Medicine, Chapel Hill, NC 27599, USA
- Center for Environmental Health and Susceptibility, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
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24
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Danzi F, Pacchiana R, Mafficini A, Scupoli MT, Scarpa A, Donadelli M, Fiore A. To metabolomics and beyond: a technological portfolio to investigate cancer metabolism. Signal Transduct Target Ther 2023; 8:137. [PMID: 36949046 PMCID: PMC10033890 DOI: 10.1038/s41392-023-01380-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 02/08/2023] [Accepted: 02/15/2023] [Indexed: 03/24/2023] Open
Abstract
Tumour cells have exquisite flexibility in reprogramming their metabolism in order to support tumour initiation, progression, metastasis and resistance to therapies. These reprogrammed activities include a complete rewiring of the bioenergetic, biosynthetic and redox status to sustain the increased energetic demand of the cells. Over the last decades, the cancer metabolism field has seen an explosion of new biochemical technologies giving more tools than ever before to navigate this complexity. Within a cell or a tissue, the metabolites constitute the direct signature of the molecular phenotype and thus their profiling has concrete clinical applications in oncology. Metabolomics and fluxomics, are key technological approaches that mainly revolutionized the field enabling researchers to have both a qualitative and mechanistic model of the biochemical activities in cancer. Furthermore, the upgrade from bulk to single-cell analysis technologies provided unprecedented opportunity to investigate cancer biology at cellular resolution allowing an in depth quantitative analysis of complex and heterogenous diseases. More recently, the advent of functional genomic screening allowed the identification of molecular pathways, cellular processes, biomarkers and novel therapeutic targets that in concert with other technologies allow patient stratification and identification of new treatment regimens. This review is intended to be a guide for researchers to cancer metabolism, highlighting current and emerging technologies, emphasizing advantages, disadvantages and applications with the potential of leading the development of innovative anti-cancer therapies.
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Affiliation(s)
- Federica Danzi
- Department of Neurosciences, Biomedicine and Movement Sciences, Section of Biochemistry, University of Verona, Verona, Italy
| | - Raffaella Pacchiana
- Department of Neurosciences, Biomedicine and Movement Sciences, Section of Biochemistry, University of Verona, Verona, Italy
| | - Andrea Mafficini
- Department of Diagnostics and Public Health, University of Verona, Verona, Italy
| | - Maria T Scupoli
- Department of Neurosciences, Biomedicine and Movement Sciences, Biology and Genetics Section, University of Verona, Verona, Italy
| | - Aldo Scarpa
- Department of Diagnostics and Public Health, University of Verona, Verona, Italy
- ARC-NET Research Centre, University and Hospital Trust of Verona, Verona, Italy
| | - Massimo Donadelli
- Department of Neurosciences, Biomedicine and Movement Sciences, Section of Biochemistry, University of Verona, Verona, Italy.
| | - Alessandra Fiore
- Department of Neurosciences, Biomedicine and Movement Sciences, Section of Biochemistry, University of Verona, Verona, Italy
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25
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Glutamine-dependent effects of nitric oxide on cancer cells subjected to hypoxia-reoxygenation. Nitric Oxide 2023; 130:22-35. [PMID: 36414197 DOI: 10.1016/j.niox.2022.11.003] [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: 07/07/2022] [Revised: 11/12/2022] [Accepted: 11/18/2022] [Indexed: 11/21/2022]
Abstract
Limited O2 availability can decrease essential processes in energy metabolism. However, cancers have developed distinct metabolic adaptations to these conditions. For example, glutaminolysis can maintain energy metabolism and hypoxia signaling. Additionally, it has been observed that nitric oxide (NO) possesses concentration-dependent, biphasic effects in cancer. NO has potent anti-tumor effects through modulating events such as angiogenesis and metastasis at low physiological concentrations and inducing cell death at higher concentrations. In this study, Ewing Sarcoma cells (A-673), MIA PaCa, and SKBR3 cells were treated with DetaNONOate (DetaNO) in a model of hypoxia (1% O2) and reoxygenation (21% O2). All 3 cell types showed NO-dependent inhibition of cellular O2 consumption which was enhanced as O2-tension decreased. L-Gln depletion suppressed the mitochondrial response to decreasing O2 tension in all 3 cell types and resulted in inhibition of Complex I activity. In A-673 cells the O2 tension dependent change in mitochondrial O2 consumption and increase in glycolysis was dependent on the presence of L-Gln. The response to hypoxia and Complex I activity were restored by α-ketoglutarate. NO exposure resulted in the A-673 cells showing greater sensitivity to decreasing O2 tension. Under conditions of L-Gln depletion, NO restored HIF-1α levels and the mitochondrial response to O2 tension possibly through the increase of 2-hydroxyglutarate. NO also resulted in suppression of cellular bioenergetics and further inhibition of Complex I which was not rescued by α-ketoglutarate. Taken together these data suggest that NO modulates the mitochondrial response to O2 differentially in the absence and presence of L-Gln. These data suggest a combination of metabolic strategies targeting glutaminolysis and Complex I in cancer cells.
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26
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Rey F, Messa L, Maghraby E, Casili G, Ottolenghi S, Barzaghini B, Raimondi MT, Cereda C, Cuzzocrea S, Zuccotti G, Esposito E, Paterniti I, Carelli S. Oxygen Sensing in Neurodegenerative Diseases: Current Mechanisms, Implication of Transcriptional Response, and Pharmacological Modulation. Antioxid Redox Signal 2023; 38:160-182. [PMID: 35793106 DOI: 10.1089/ars.2022.0046] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Significance: Oxygen (O2) sensing is the fundamental process through which organisms respond to changes in O2 levels. Complex networks exist allowing the maintenance of O2 levels through the perception, capture, binding, transport, and delivery of molecular O2. The brain extreme sensitivity to O2 balance makes the dysregulation of related processes crucial players in the pathogenesis of neurodegenerative diseases (NDs). In this study, we wish to review the most relevant advances in O2 sensing in relation to Alzheimer's disease, Parkinson's disease, and amyotrophic lateral sclerosis. Recent Advances: Over the years, it has been clarified that most NDs share common pathways, a great number of which are in relation to O2 imbalance. These include hypoxia, hyperoxia, reactive oxygen species production, metabolism of metals, protein misfolding, and neuroinflammation. Critical Issues: There is still a gap in knowledge concerning how O2 sensing plays a role in the above indicated neurodegenerations. Specifically, O2 concentrations are perceived in body sites that are not limited to the brain, but primarily reside in other organs. Moreover, the mechanisms of O2 sensing, gene expression, and signal transduction seem to correlate with neurodegeneration, but many aspects are mechanistically still unexplained. Future Directions: Future studies should focus on the precise characterization of O2 level disruption and O2 sensing mechanisms in NDs. Moreover, advances need to be made also concerning the techniques used to assess O2 sensing dysfunctions in these diseases. There is also the need to develop innovative therapies targeting this precise mechanism rather than its secondary effects, as early intervention is necessary. Antioxid. Redox Signal. 38, 160-182.
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Affiliation(s)
- Federica Rey
- Department of Biomedical and Clinical Sciences, University of Milano, Milano, Italy.,Department of Biomedical and Clinical Sciences, Pediatric Research Center "Romeo ed Enrica Invernizzi," University of Milano, Milano, Italy
| | - Letizia Messa
- Department of Biomedical and Clinical Sciences, University of Milano, Milano, Italy.,Department of Biomedical and Clinical Sciences, Pediatric Research Center "Romeo ed Enrica Invernizzi," University of Milano, Milano, Italy
| | - Erika Maghraby
- Department of Biomedical and Clinical Sciences, University of Milano, Milano, Italy.,Department of Biomedical and Clinical Sciences, Pediatric Research Center "Romeo ed Enrica Invernizzi," University of Milano, Milano, Italy
| | - Giovanna Casili
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
| | - Sara Ottolenghi
- Department of Medicine and Surgery, University of Milano Bicocca, Milano, Italy
| | - Bianca Barzaghini
- Department of Chemistry, Materials and Chemical Engineering "Giulio Natta," Politecnico di Milano, Milano, Italy
| | - Manuela Teresa Raimondi
- Department of Chemistry, Materials and Chemical Engineering "Giulio Natta," Politecnico di Milano, Milano, Italy
| | - Cristina Cereda
- Department of Women, Mothers and Neonatal Care, Children's Hospital "V. Buzzi," Milano, Italy
| | - Salvatore Cuzzocrea
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
| | - Gianvincenzo Zuccotti
- Department of Biomedical and Clinical Sciences, University of Milano, Milano, Italy.,Department of Biomedical and Clinical Sciences, Pediatric Research Center "Romeo ed Enrica Invernizzi," University of Milano, Milano, Italy.,Department of Pediatrics, Children's Hospital "V. Buzzi," Milano, Italy
| | - Emanuela Esposito
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
| | - Irene Paterniti
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
| | - Stephana Carelli
- Department of Biomedical and Clinical Sciences, University of Milano, Milano, Italy.,Department of Biomedical and Clinical Sciences, Pediatric Research Center "Romeo ed Enrica Invernizzi," University of Milano, Milano, Italy
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27
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Calderin EP, Zheng JJ, Boyd NL, McNally L, Audam TN, Lorkiewicz P, Hill BG, Hellmann J. Exercise-induced specialized proresolving mediators stimulate AMPK phosphorylation to promote mitochondrial respiration in macrophages. Mol Metab 2022; 66:101637. [PMID: 36400404 PMCID: PMC9719872 DOI: 10.1016/j.molmet.2022.101637] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Accepted: 11/07/2022] [Indexed: 11/16/2022] Open
Abstract
OBJECTIVE Physical activity has been shown to reduce the risk of CVD mortality in large-cohort longitudinal studies; however, the mechanisms underpinning the beneficial effects of exercise remain incompletely understood. Emerging data suggest that the risk reducing effect of exercise extends beyond changes in traditional CVD risk factors alone and involves alterations in immunity and reductions in inflammatory mediator production. Our study aimed to determine whether exercise-enhanced production of proresolving lipid mediators contribute to alterations in macrophage intermediary metabolism, which may contribute to the anti-inflammatory effects of exercise. METHODS Changes in lipid mediators and macrophage metabolism were assessed in C57Bl/6 mice following 4 weeks of voluntary exercise training. To investigate whether exercise-stimulated upregulation of specialized proresolving lipid mediators (SPMs) was sufficient to enhance mitochondrial respiration, both macrophages from control mice and human donors were incubated in vitro with SPMs and mitochondrial respiratory parameters were measured using extracellular flux analysis. Compound-C, an ATP-competitive inhibitor of AMPK kinase activity, was used to investigate the role of AMPK activity in SPM-induced mitochondrial metabolism. To assess the in vivo contribution of 5-lipoxygenase in AMPK activation and exercise-induced mitochondrial metabolism in macrophages, Alox5-/- mice were also subjected to exercise training. RESULTS Four weeks of exercise training enhanced proresolving lipid mediator production, while also stimulating the catabolism of inflammatory lipid mediators (e.g., leukotrienes and prostaglandins). This shift in lipid mediator balance following exercise was associated with increased macrophage mitochondrial metabolism. We also find that treating human and murine macrophages in vitro with proresolving lipid mediators enhances mitochondrial respiratory parameters. The proresolving lipid mediators RvD1, RvE1, and MaR1, but not RvD2, stimulated mitochondrial respiration through an AMPK-dependent signaling mechanism. Additionally, in a subset of macrophages, exercise-induced mitochondrial activity in vivo was dependent upon 5-lipoxygenase activity. CONCLUSION Collectively, these results suggest that exercise stimulates proresolving lipid mediator biosynthesis and mitochondrial metabolism in macrophages via AMPK, which might contribute to the anti-inflammatory and CVD risk reducing effect of exercise.
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Affiliation(s)
- Ernesto Pena Calderin
- Diabetes and Obesity Center, Christina Lee Brown Envirome Institute, Division of Environmental Medicine, University of Louisville School of Medicine, Louisville, KY, 40202, USA,Department of Physiology, University of Louisville School of Medicine, Louisville, KY, 40202, USA
| | - Jing-Juan Zheng
- Diabetes and Obesity Center, Christina Lee Brown Envirome Institute, Division of Environmental Medicine, University of Louisville School of Medicine, Louisville, KY, 40202, USA
| | - Nolan L. Boyd
- Diabetes and Obesity Center, Christina Lee Brown Envirome Institute, Division of Environmental Medicine, University of Louisville School of Medicine, Louisville, KY, 40202, USA
| | - Lindsey McNally
- Diabetes and Obesity Center, Christina Lee Brown Envirome Institute, Division of Environmental Medicine, University of Louisville School of Medicine, Louisville, KY, 40202, USA
| | - Timothy N. Audam
- Diabetes and Obesity Center, Christina Lee Brown Envirome Institute, Division of Environmental Medicine, University of Louisville School of Medicine, Louisville, KY, 40202, USA
| | - Pawel Lorkiewicz
- Diabetes and Obesity Center, Christina Lee Brown Envirome Institute, Division of Environmental Medicine, University of Louisville School of Medicine, Louisville, KY, 40202, USA
| | - Bradford G. Hill
- Diabetes and Obesity Center, Christina Lee Brown Envirome Institute, Division of Environmental Medicine, University of Louisville School of Medicine, Louisville, KY, 40202, USA
| | - Jason Hellmann
- Diabetes and Obesity Center, Christina Lee Brown Envirome Institute, Division of Environmental Medicine, University of Louisville School of Medicine, Louisville, KY, 40202, USA,Corresponding author. 580 S. Preston St. Rm 204F, Delia Baxter II Building, University of Louisville, Louisville, KY 40202, USA.
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28
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Liao FH, Yao CN, Chen SP, Wu TH, Lin SY. Transdermal Delivery of Succinate Accelerates Energy Dissipation of Brown Adipocytes to Reduce Remote Fat Accumulation. Mol Pharm 2022; 19:4299-4310. [DOI: 10.1021/acs.molpharmaceut.2c00628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fang-Hsuean Liao
- Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes, 35 Keyan Road,
Zhunan Town, Miaoli County 35053, Taiwan
| | - Chun-Nien Yao
- Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes, 35 Keyan Road,
Zhunan Town, Miaoli County 35053, Taiwan
| | - Shu-Ping Chen
- Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes, 35 Keyan Road,
Zhunan Town, Miaoli County 35053, Taiwan
| | - Te-Haw Wu
- Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes, 35 Keyan Road,
Zhunan Town, Miaoli County 35053, Taiwan
| | - Shu-Yi Lin
- Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes, 35 Keyan Road,
Zhunan Town, Miaoli County 35053, Taiwan
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29
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Jankowski CS, Rabinowitz JD. Selenium Modulates Cancer Cell Response to Pharmacologic Ascorbate. Cancer Res 2022; 82:3486-3498. [PMID: 35916672 PMCID: PMC9532358 DOI: 10.1158/0008-5472.can-22-0408] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 05/28/2022] [Accepted: 07/29/2022] [Indexed: 11/16/2022]
Abstract
High-dose ascorbate (vitamin C) has shown promising anticancer activity. Two redox mechanisms have been proposed: hydrogen peroxide generation by ascorbate itself or glutathione depletion by dehydroascorbate (formed by ascorbate oxidation). Here we show that the metabolic effects and cytotoxicity of high-dose ascorbate in vitro result from hydrogen peroxide independently of dehydroascorbate. These effects were suppressed by selenium through antioxidant selenoenzymes including glutathione peroxidase 1 (GPX1) but not the classic ferroptosis-inhibiting selenoenzyme GPX4. Selenium-mediated protection from ascorbate was powered by NADPH from the pentose phosphate pathway. In vivo, dietary selenium deficiency resulted in significant enhancement of ascorbate activity against glioblastoma xenografts. These data establish selenoproteins as key mediators of cancer redox homeostasis. Cancer sensitivity to free radical-inducing therapies, including ascorbate, may depend on selenium, providing a dietary approach for improving their anticancer efficacy. SIGNIFICANCE Selenium restriction augments ascorbate efficacy and extends lifespan in a mouse xenograft model of glioblastoma, suggesting that targeting selenium-mediated antioxidant defenses merits clinical evaluation in combination with ascorbate and other pro-oxidant therapies.
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Affiliation(s)
- Connor S.R. Jankowski
- Department of Molecular Biology
- Lewis-Sigler Institute for Integrative Genomics
- Ludwig Institute for Cancer Research, Princeton Branch
| | - Joshua D. Rabinowitz
- Lewis-Sigler Institute for Integrative Genomics
- Ludwig Institute for Cancer Research, Princeton Branch
- Department of Chemistry, Princeton University
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30
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Heuschkel MA, Babler A, Heyn J, van der Vorst EPC, Steenman M, Gesper M, Kappel BA, Magne D, Gouëffic Y, Kramann R, Jahnen-Dechent W, Marx N, Quillard T, Goettsch C. Distinct role of mitochondrial function and protein kinase C in intimal and medial calcification in vitro. Front Cardiovasc Med 2022; 9:959457. [PMID: 36204585 PMCID: PMC9530266 DOI: 10.3389/fcvm.2022.959457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Accepted: 08/15/2022] [Indexed: 11/17/2022] Open
Abstract
Introduction Vascular calcification (VC) is a major risk factor for cardiovascular morbidity and mortality. Depending on the location of mineral deposition within the arterial wall, VC is classified as intimal and medial calcification. Using in vitro mineralization assays, we developed protocols triggering both types of calcification in vascular smooth muscle cells (SMCs) following diverging molecular pathways. Materials and methods and results Human coronary artery SMCs were cultured in osteogenic medium (OM) or high calcium phosphate medium (CaP) to induce a mineralized extracellular matrix. OM induces osteoblast-like differentiation of SMCs–a key process in intimal calcification during atherosclerotic plaque remodeling. CaP mimics hyperphosphatemia, associated with chronic kidney disease–a risk factor for medial calcification. Transcriptomic analysis revealed distinct gene expression profiles of OM and CaP-calcifying SMCs. OM and CaP-treated SMCs shared 107 differentially regulated genes related to SMC contraction and metabolism. Real-time extracellular efflux analysis demonstrated decreased mitochondrial respiration and glycolysis in CaP-treated SMCs compared to increased mitochondrial respiration without altered glycolysis in OM-treated SMCs. Subsequent kinome and in silico drug repurposing analysis (Connectivity Map) suggested a distinct role of protein kinase C (PKC). In vitro validation experiments demonstrated that the PKC activators prostratin and ingenol reduced calcification triggered by OM and promoted calcification triggered by CaP. Conclusion Our direct comparison results of two in vitro calcification models strengthen previous observations of distinct intracellular mechanisms that trigger OM and CaP-induced SMC calcification in vitro. We found a differential role of PKC in OM and CaP-calcified SMCs providing new potential cellular and molecular targets for pharmacological intervention in VC. Our data suggest that the field should limit the generalization of results found in in vitro studies using different calcification protocols.
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Affiliation(s)
- Marina A. Heuschkel
- Department of Internal Medicine I–Cardiology, Medical Faculty, RWTH Aachen University, Aachen, Germany
| | - Anne Babler
- Institute of Experimental Medicine and Systems Biology, University Hospital, RWTH Aachen, Aachen, Germany
| | - Jonas Heyn
- Department of Internal Medicine I–Cardiology, Medical Faculty, RWTH Aachen University, Aachen, Germany
| | - Emiel P. C. van der Vorst
- Interdisciplinary Center for Clinical Research, Institute for Molecular Cardiovascular Research, RWTH Aachen University, Aachen, Germany
- Department of Pathology, Cardiovascular Research Institute Maastricht, Maastricht University Medical Centre, Maastricht, Netherlands
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximilians-University Munich, Munich, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, Munich, Germany
| | - Marja Steenman
- L’institut Du Thorax, Inserm UMR 1087, CNRS, INSERM, France and Nantes Université, Nantes, France
| | - Maren Gesper
- Department of Internal Medicine I–Cardiology, Medical Faculty, RWTH Aachen University, Aachen, Germany
| | - Ben A. Kappel
- Department of Internal Medicine I–Cardiology, Medical Faculty, RWTH Aachen University, Aachen, Germany
| | - David Magne
- ICBMS UMR CNRS 5246, Université Claude Bernard Lyon 1, Villeurbanne, France
| | - Yann Gouëffic
- Department of Vascular Surgery, Vascular Center, Groupe Hospitalier Paris Saint-Joseph, Paris, France
| | - Rafael Kramann
- Institute of Experimental Medicine and Systems Biology, University Hospital, RWTH Aachen, Aachen, Germany
- Department of Nephrology and Clinical Immunology, University Hospital RWTH Aachen, Aachen, Germany
- Department of Internal Medicine, Nephrology and Transplantation, Erasmus Medical Center, Rotterdam, Netherlands
| | - Willi Jahnen-Dechent
- Biointerface Laboratory, Helmholtz Institute for Biomedical Engineering, RWTH Aachen University, Aachen, Germany
| | - Nikolaus Marx
- Department of Internal Medicine I–Cardiology, Medical Faculty, RWTH Aachen University, Aachen, Germany
| | - Thibaut Quillard
- L’institut Du Thorax, Inserm UMR 1087, CNRS, INSERM, France and Nantes Université, Nantes, France
- PHY-OS Laboratory, INSERM UMR 1238, Nantes University of Medicine, Nantes, France
| | - Claudia Goettsch
- Department of Internal Medicine I–Cardiology, Medical Faculty, RWTH Aachen University, Aachen, Germany
- *Correspondence: Claudia Goettsch,
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Aoki C, Imai K, Mizutani T, Sugiyama D, Miki R, Koya Y, Kobayashi T, Ushida T, Iitani Y, Nakamura N, Owaki T, Nishikawa H, Toyokuni S, Kajiyama H, Kotani T. Molecular hydrogen has a positive impact on pregnancy maintenance through enhancement of mitochondrial function and immunomodulatory effects on T cells. Life Sci 2022; 308:120955. [PMID: 36115583 DOI: 10.1016/j.lfs.2022.120955] [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: 04/20/2022] [Revised: 08/30/2022] [Accepted: 09/09/2022] [Indexed: 10/31/2022]
Abstract
AIMS Molecular hydrogen (H2) has attracted growing interest because of its implications in various diseases. However, the molecular mechanisms underlying the remarkable effect of a small amount of H2 remain elusive. No knowledge has been available on the role of H2 in the etiology of pregnancy disorders or its direct influence on human immune cells. Since maternal immunity, T cells in particular, plays a critical role in pregnancy maintenance. We investigated the effects of H2 on T cells and its relation to preterm birth (PTB). MAIN METHODS Exhaled H2 concentrations in pregnant women were measured and correlated with cytokine concentrations in maternal and umbilical cord blood. H2 was added to T cells collected from healthy donors, and differentiation and proliferation were examined. Energy metabolism was also examined. H2 was administered to mice and cytokine expression was compared. KEY FINDINGS Our prospective observational study revealed that maternal production of H2 is significantly lower in pregnant women with PTB, suggesting its potential as a biomarker for predicting PTB. We found that H2 has clear associations with several maternal cytokines, and acts as an immunomodulator by exerting mitochondrial function in human T cells. Moreover, in vivo administration of H2 to pregnant mice regulated inflammatory responses and reduced PTB caused by T cell activation, which further supports the notion that H2 may contribute to prolonged gestation through its immunomodulatory effect. SIGNIFICANCE Measuring maternal H2-production could be a potential clinical tool in the management of PTB, and H2 may have positive impact on pregnancy maintenance.
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Affiliation(s)
- Chieko Aoki
- Department of Obstetrics and Gynecology, Japan
| | - Kenji Imai
- Department of Obstetrics and Gynecology, Japan.
| | - Teruyuki Mizutani
- Department of Obstetrics and Gynecology, Japan; Department of Immunology, Japan
| | | | - Rika Miki
- Laboratory of Bell Research Centre-Department of Obstetrics and Gynecology Collaborative Research, Bell Research Centre for Reproductive Health and Cancer, Department of Reproduction, Japan
| | - Yoshihiro Koya
- Laboratory of Bell Research Centre-Department of Obstetrics and Gynecology Collaborative Research, Bell Research Centre for Reproductive Health and Cancer, Department of Reproduction, Japan
| | | | | | | | | | - Taro Owaki
- Department of Obstetrics and Gynecology, Japan
| | - Hiroyoshi Nishikawa
- Department of Immunology, Japan; Division of Cancer Immunology, Research Institute/Exploratory Oncology Research and Clinical Trial Center, National Cancer Center, Kashiwa, Japan
| | - Shinya Toyokuni
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan
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Ravichandran M, Hu J, Cai C, Ward NP, Venida A, Foakes C, Kuljanin M, Yang A, Hennessey CJ, Yang Y, Desousa BR, Rademaker G, Staes AA, Cakir Z, Jain IH, Aguirre AJ, Mancias JD, Shen Y, DeNicola GM, Perera RM. Coordinated Transcriptional and Catabolic Programs Support Iron-Dependent Adaptation to RAS-MAPK Pathway Inhibition in Pancreatic Cancer. Cancer Discov 2022; 12:2198-2219. [PMID: 35771494 PMCID: PMC9444964 DOI: 10.1158/2159-8290.cd-22-0044] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 05/23/2022] [Accepted: 06/27/2022] [Indexed: 12/30/2022]
Abstract
The mechanisms underlying metabolic adaptation of pancreatic ductal adenocarcinoma (PDA) cells to pharmacologic inhibition of RAS-MAPK signaling are largely unknown. Using transcriptome and chromatin immunoprecipitation profiling of PDA cells treated with the MEK inhibitor (MEKi) trametinib, we identify transcriptional antagonism between c-MYC and the master transcription factors for lysosome gene expression, the MiT/TFE proteins. Under baseline conditions, c-MYC and MiT/TFE factors compete for binding to lysosome gene promoters to fine-tune gene expression. Treatment of PDA cells or patient organoids with MEKi leads to c-MYC downregulation and increased MiT/TFE-dependent lysosome biogenesis. Quantitative proteomics of immunopurified lysosomes uncovered reliance on ferritinophagy, the selective degradation of the iron storage complex ferritin, in MEKi-treated cells. Ferritinophagy promotes mitochondrial iron-sulfur cluster protein synthesis and enhanced mitochondrial respiration. Accordingly, suppressing iron utilization sensitizes PDA cells to MEKi, highlighting a critical and targetable reliance on lysosome-dependent iron supply during adaptation to KRAS-MAPK inhibition. SIGNIFICANCE Reduced c-MYC levels following MAPK pathway suppression facilitate the upregulation of autophagy and lysosome biogenesis. Increased autophagy-lysosome activity is required for increased ferritinophagy-mediated iron supply, which supports mitochondrial respiration under therapy stress. Disruption of ferritinophagy synergizes with KRAS-MAPK inhibition and blocks PDA growth, thus highlighting a key targetable metabolic dependency. See related commentary by Jain and Amaravadi, p. 2023. See related article by Santana-Codina et al., p. 2180. This article is highlighted in the In This Issue feature, p. 2007.
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Affiliation(s)
- Mirunalini Ravichandran
- Department of Anatomy, Department of Pathology, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Jingjie Hu
- Department of Anatomy, Department of Pathology, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Charles Cai
- Department of Neurology, Institute for Human Genetics, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Nathan P. Ward
- Department of Cancer Physiology, H. Lee Moffitt Cancer Center, Tampa, FL 33612, USA
| | - Anthony Venida
- Department of Anatomy, Department of Pathology, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Callum Foakes
- Department of Anatomy, Department of Pathology, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Miljan Kuljanin
- Division of Radiation and Genome Stability, Department of Radiation Oncology, Dana-Farber Cancer Institute, Boston, MA 02215, USA
| | - Annan Yang
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, USA
| | - Connor J. Hennessey
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, USA
| | - Yang Yang
- Department of Anatomy, Department of Pathology, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Brandon R. Desousa
- Department of Biochemistry, University of California, San Francisco, San Francisco, CA 94158, USA
- Gladstone Institute of Cardiovascular Disease, Gladstone Institutes, San Francisco, CA 94158, USA
| | - Gilles Rademaker
- Department of Anatomy, Department of Pathology, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Annelot A.L. Staes
- Department of Anatomy, Department of Pathology, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Zeynep Cakir
- Department of Anatomy, Department of Pathology, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Isha H. Jain
- Department of Biochemistry, University of California, San Francisco, San Francisco, CA 94158, USA
- Gladstone Institute of Cardiovascular Disease, Gladstone Institutes, San Francisco, CA 94158, USA
| | - Andrew J. Aguirre
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, USA
- Broad Institute of MIT and Harvard, Cambridge, MA, 02142, USA
| | - Joseph D. Mancias
- Division of Radiation and Genome Stability, Department of Radiation Oncology, Dana-Farber Cancer Institute, Boston, MA 02215, USA
| | - Yin Shen
- Department of Neurology, Institute for Human Genetics, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Gina M. DeNicola
- Department of Cancer Physiology, H. Lee Moffitt Cancer Center, Tampa, FL 33612, USA
| | - Rushika M. Perera
- Department of Anatomy, Department of Pathology, University of California, San Francisco, San Francisco, CA 94143, USA
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94158, USA
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Elia I, Rowe JH, Johnson S, Joshi S, Notarangelo G, Kurmi K, Weiss S, Freeman GJ, Sharpe AH, Haigis MC. Tumor cells dictate anti-tumor immune responses by altering pyruvate utilization and succinate signaling in CD8 + T cells. Cell Metab 2022; 34:1137-1150.e6. [PMID: 35820416 PMCID: PMC9357162 DOI: 10.1016/j.cmet.2022.06.008] [Citation(s) in RCA: 83] [Impact Index Per Article: 41.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 04/22/2022] [Accepted: 06/15/2022] [Indexed: 01/22/2023]
Abstract
The tumor microenvironment (TME) is a unique metabolic niche that can inhibit T cell metabolism and cytotoxicity. To dissect the metabolic interplay between tumors and T cells, we establish an in vitro system that recapitulates the metabolic niche of the TME and allows us to define cell-specific metabolism. We identify tumor-derived lactate as an inhibitor of CD8+ T cell cytotoxicity, revealing an unexpected metabolic shunt in the TCA cycle. Metabolically fit cytotoxic T cells shunt succinate out of the TCA cycle to promote autocrine signaling via the succinate receptor (SUCNR1). Cytotoxic T cells are reliant on pyruvate carboxylase (PC) to replenish TCA cycle intermediates. By contrast, lactate reduces PC-mediated anaplerosis. The inhibition of pyruvate dehydrogenase (PDH) is sufficient to restore PC activity, succinate secretion, and the activation of SUCNR1. These studies identify PDH as a potential drug target to allow CD8+ T cells to retain cytotoxicity and overcome a lactate-enriched TME.
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Affiliation(s)
- Ilaria Elia
- Department of Cell Biology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA; Department of Cellular and Molecular Medicine, KU Leuven, 3000 Leuven, Belgium
| | - Jared H Rowe
- Department of Immunology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA; Evergrande Center for Immunologic Diseases, Harvard Medical School, Brigham and Women's Hospital, Boston, MA 02115, USA; Division of Pediatric Oncology, Dana-Farber Cancer Institute, Boston, MA 02215, USA
| | - Sheila Johnson
- Department of Cell Biology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Shakchhi Joshi
- Department of Cell Biology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Giulia Notarangelo
- Department of Cell Biology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Kiran Kurmi
- Department of Cell Biology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Sarah Weiss
- Department of Immunology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA; Evergrande Center for Immunologic Diseases, Harvard Medical School, Brigham and Women's Hospital, Boston, MA 02115, USA
| | - Gordon J Freeman
- Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Arlene H Sharpe
- Department of Immunology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA; Evergrande Center for Immunologic Diseases, Harvard Medical School, Brigham and Women's Hospital, Boston, MA 02115, USA.
| | - Marcia C Haigis
- Department of Cell Biology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA.
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34
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Jiang C, Ward NP, Prieto-Farigua N, Kang YP, Thalakola A, Teng M, DeNicola GM. A CRISPR screen identifies redox vulnerabilities for KEAP1/NRF2 mutant non-small cell lung cancer. Redox Biol 2022; 54:102358. [PMID: 35667246 PMCID: PMC9168196 DOI: 10.1016/j.redox.2022.102358] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 05/17/2022] [Accepted: 05/30/2022] [Indexed: 12/02/2022] Open
Abstract
The redox regulator NRF2 is hyperactivated in a large percentage of non-small cell lung cancer (NSCLC) cases, which is associated with chemotherapy and radiation resistance. To identify redox vulnerabilities for KEAP1/NRF2 mutant NSCLC, we conducted a CRISPR-Cas9-based negative selection screen for antioxidant enzyme genes whose loss sensitized cells to sub-lethal concentrations of the superoxide (O2•-) -generating drug β-Lapachone. While our screen identified expected hits in the pentose phosphate pathway, the thioredoxin-dependent antioxidant system, and glutathione reductase, we also identified the mitochondrial superoxide dismutase 2 (SOD2) as one of the top hits. Surprisingly, β-Lapachone did not generate mitochondrial O2•- but rather SOD2 loss enhanced the efficacy of β-Lapachone due to loss of iron-sulfur protein function, loss of mitochondrial ATP maintenance and deficient NADPH production. Importantly, inhibition of mitochondrial electron transport activity sensitized cells to β-Lapachone, demonstrating that these effects may be translated to increase ROS sensitivity therapeutically.
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Affiliation(s)
- Chang Jiang
- Department of Cancer Physiology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, 33612, USA.
| | - Nathan P Ward
- Department of Cancer Physiology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, 33612, USA
| | - Nicolas Prieto-Farigua
- Department of Cancer Physiology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, 33612, USA
| | - Yun Pyo Kang
- Department of Cancer Physiology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, 33612, USA
| | - Anish Thalakola
- Department of Cancer Physiology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, 33612, USA
| | - Mingxiang Teng
- Department of Biostatistics and Bioinformatics, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, 33612, USA
| | - Gina M DeNicola
- Department of Cancer Physiology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, 33612, USA.
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35
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Divakaruni AS, Jastroch M. A practical guide for the analysis, standardization and interpretation of oxygen consumption measurements. Nat Metab 2022; 4:978-994. [PMID: 35971004 PMCID: PMC9618452 DOI: 10.1038/s42255-022-00619-4] [Citation(s) in RCA: 37] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Accepted: 06/17/2022] [Indexed: 12/14/2022]
Abstract
Measurement of oxygen consumption is a powerful and uniquely informative experimental technique. It can help identify mitochondrial mechanisms of action following pharmacologic and genetic interventions, and characterize energy metabolism in physiology and disease. The conceptual and practical benefits of respirometry have made it a frontline technique to understand how mitochondrial function can interface with-and in some cases control-cell physiology. Nonetheless, an appreciation of the complexity and challenges involved with such measurements is required to avoid common experimental and analytical pitfalls. Here we provide a practical guide to oxygen consumption measurements covering the selection of experimental models and instrumentation, as well as recommendations for the collection, interpretation and normalization of data. These guidelines are provided with the intention of aiding experimental design and enhancing the overall reputability, transparency and reliability of oxygen consumption measurements.
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Affiliation(s)
- Ajit S Divakaruni
- Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA.
| | - Martin Jastroch
- Department of Molecular Biosciences, The Wenner-Gren Institute, The Arrhenius Laboratories F3, Stockholm University, Stockholm, Sweden
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36
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Afzal J, Liu Y, Du W, Suhail Y, Zong P, Feng J, Ajeti V, Sayyad WA, Nikolaus J, Yankova M, Deymier AC, Yue L, Kshitiz. Cardiac ultrastructure inspired matrix induces advanced metabolic and functional maturation of differentiated human cardiomyocytes. Cell Rep 2022; 40:111146. [PMID: 35905711 DOI: 10.1016/j.celrep.2022.111146] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Revised: 04/26/2022] [Accepted: 07/07/2022] [Indexed: 12/21/2022] Open
Abstract
The vast potential of human induced pluripotent stem-cell-derived cardiomyocytes (hiPSC-CMs) in preclinical models of cardiac pathologies, precision medicine, and drug screening remains to be fully realized because hiPSC-CMs are immature without adult-like characteristics. Here, we present a method to accelerate hiPSC-CM maturation on a substrate, cardiac mimetic matrix (CMM), mimicking adult human heart matrix ligand chemistry, rigidity, and submicron ultrastructure, which synergistically mature hiPSC-CMs rapidly within 30 days. hiPSC-CMs matured on CMM exhibit systemic transcriptomic maturation toward an adult heart state, are aligned with high strain energy, metabolically rely on oxidative phosphorylation and fatty acid oxidation, and display enhanced redox handling capability, efficient calcium handling, and electrophysiological features of ventricular myocytes. Endothelin-1-induced pathological hypertrophy is mitigated on CMM, highlighting the role of a native cardiac microenvironment in withstanding hypertrophy progression. CMM is a convenient model for accelerated development of ventricular myocytes manifesting highly specialized cardiac-specific functions.
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Affiliation(s)
- Junaid Afzal
- Department of Medicine, Division of Cardiology, University of California, San Francisco, San Francisco, CA 94158, USA.
| | - Yamin Liu
- Department of Biomedical Engineering, University of Connecticut Health, Farmington, CT 06032, USA
| | - Wenqiang Du
- Department of Biomedical Engineering, University of Connecticut Health, Farmington, CT 06032, USA
| | - Yasir Suhail
- Department of Biomedical Engineering, University of Connecticut Health, Farmington, CT 06032, USA; Center for Cellular Analysis and Modeling, University of Connecticut Health, Farmington, CT 06032, USA
| | - Pengyu Zong
- Department of Cell Biology, University of Connecticut Health, Farmington, CT 06032, USA; Calhoun Cardiology Center, University of Connecticut Health, Farmington, CT 06032, USA
| | - Jianlin Feng
- Department of Cell Biology, University of Connecticut Health, Farmington, CT 06032, USA; Calhoun Cardiology Center, University of Connecticut Health, Farmington, CT 06032, USA
| | - Visar Ajeti
- Department of Biomedical Engineering, University of Connecticut Health, Farmington, CT 06032, USA; Center for Cellular Analysis and Modeling, University of Connecticut Health, Farmington, CT 06032, USA
| | - Wasim A Sayyad
- Department of Cell Biology, Yale University, New Haven, CT 06510, USA
| | - Joerg Nikolaus
- West Campus Imaging Core, Yale University, New Haven, CT 06477, USA
| | - Maya Yankova
- Electron Microscopy Core, University of Connecticut Health, Farmington, CT 06032, USA
| | - Alix C Deymier
- Department of Biomedical Engineering, University of Connecticut Health, Farmington, CT 06032, USA
| | - Lixia Yue
- Department of Cell Biology, University of Connecticut Health, Farmington, CT 06032, USA; Calhoun Cardiology Center, University of Connecticut Health, Farmington, CT 06032, USA
| | - Kshitiz
- Department of Biomedical Engineering, University of Connecticut Health, Farmington, CT 06032, USA; Center for Cellular Analysis and Modeling, University of Connecticut Health, Farmington, CT 06032, USA; Department of Cell Biology, University of Connecticut Health, Farmington, CT 06032, USA.
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Tan TCY, Brown HM, Thompson JG, Mustafa S, Dunning KR. Optical imaging detects metabolic signatures associated with oocyte quality. Biol Reprod 2022; 107:1014-1025. [PMID: 35863764 PMCID: PMC9562116 DOI: 10.1093/biolre/ioac145] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 06/02/2022] [Accepted: 07/11/2022] [Indexed: 11/14/2022] Open
Abstract
Oocyte developmental potential is intimately linked to metabolism. Existing approaches to measure metabolism in the cumulus oocyte complex (COC) do not provide information on the separate cumulus and oocyte compartments. Development of an assay that achieves this may lead to an accurate diagnostic for oocyte quality. Optical imaging of the autofluorescent cofactors NAD(P)H and FAD provides a spatially resolved indicator of metabolism via the optical redox ratio ($\mathrm{FAD}/\left[\mathrm{NAD}\left(\mathrm{P}\right)\mathrm{H}+\mathrm{FAD}\right]$). This may provide an assessment of oocyte quality. Here, we determined whether the optical redox ratio is a robust methodology for measuring metabolism in the cumulus and oocyte compartments compared with oxygen consumption in the whole COC. We also determined whether optical imaging could detect metabolic differences associated with poor oocyte quality (etomoxir-treated). We used confocal microscopy to measure NAD(P)H and FAD, and extracellular flux to measure oxygen consumption. We found that the optical redox ratio was an accurate reflection of metabolism in the oocyte compartment when compared with oxygen consumption (whole COC). Etomoxir-treated COCs showed significantly lower levels of NAD(P)H and FAD compared to control. While confocal imaging demonstrated the premise, we validated this approach using hyperspectral imaging, which is clinically compatible due to its low energy dose. This confirmed lower NAD(P)H and FAD in etomoxir-treated COCs. When comparing imaged vs non-imaged COCs, subsequent preimplantation development and post-transfer viability were comparable. Collectively, these results demonstrate that label-free optical imaging of metabolic cofactors is a safe and sensitive assay for measuring metabolism and has potential to assess oocyte developmental competence.
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Affiliation(s)
- Tiffany C Y Tan
- Robinson Research Institute, School of Biomedicine, The University of Adelaide, Adelaide, South Australia, Australia.,Australian Research Council Centre of Excellence for Nanoscale Biophotonics, The University of Adelaide, Adelaide, South Australia, Australia.,Institute for Photonics and Advanced Sensing, The University of Adelaide, Adelaide, South Australia, Australia
| | - Hannah M Brown
- Victorian Heart Institute, Monash University, Clayton, Victoria, Australia
| | - Jeremy G Thompson
- Robinson Research Institute, School of Biomedicine, The University of Adelaide, Adelaide, South Australia, Australia.,Australian Research Council Centre of Excellence for Nanoscale Biophotonics, The University of Adelaide, Adelaide, South Australia, Australia.,Institute for Photonics and Advanced Sensing, The University of Adelaide, Adelaide, South Australia, Australia.,Fertilis Pty Ltd, Adelaide, South Australia, 5005, Australia
| | - Sanam Mustafa
- Robinson Research Institute, School of Biomedicine, The University of Adelaide, Adelaide, South Australia, Australia.,Australian Research Council Centre of Excellence for Nanoscale Biophotonics, The University of Adelaide, Adelaide, South Australia, Australia.,Institute for Photonics and Advanced Sensing, The University of Adelaide, Adelaide, South Australia, Australia
| | - Kylie R Dunning
- Robinson Research Institute, School of Biomedicine, The University of Adelaide, Adelaide, South Australia, Australia.,Australian Research Council Centre of Excellence for Nanoscale Biophotonics, The University of Adelaide, Adelaide, South Australia, Australia.,Institute for Photonics and Advanced Sensing, The University of Adelaide, Adelaide, South Australia, Australia
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38
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Tong Y, Zhang Z, Wang S. Role of Mitochondria in Retinal Pigment Epithelial Aging and Degeneration. FRONTIERS IN AGING 2022; 3:926627. [PMID: 35912040 PMCID: PMC9337215 DOI: 10.3389/fragi.2022.926627] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Accepted: 06/21/2022] [Indexed: 12/17/2022]
Abstract
Retinal pigment epithelial (RPE) cells form a monolayer between the neuroretina and choroid. It has multiple important functions, including acting as outer blood-retina barrier, maintaining the function of neuroretina and photoreceptors, participating in the visual cycle and regulating retinal immune response. Due to high oxidative stress environment, RPE cells are vulnerable to dysfunction, cellular senescence, and cell death, which underlies RPE aging and age-related diseases, including age-related macular degeneration (AMD). Mitochondria are the powerhouse of cells and a major source of cellular reactive oxygen species (ROS) that contribute to mitochondrial DNA damage, cell death, senescence, and age-related diseases. Mitochondria also undergo dynamic changes including fission/fusion, biogenesis and mitophagy for quality control in response to stresses. The role of mitochondria, especially mitochondrial dynamics, in RPE aging and age-related diseases, is still unclear. In this review, we summarize the current understanding of mitochondrial function, biogenesis and especially dynamics such as morphological changes and mitophagy in RPE aging and age-related RPE diseases, as well as in the biological processes of RPE cellular senescence and cell death. We also discuss the current preclinical and clinical research efforts to prevent or treat RPE degeneration by restoring mitochondrial function and dynamics.
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Affiliation(s)
- Yao Tong
- Department of Cell and Molecular Biology, Tulane University, New Orleans, LA, United States
| | - Zunyi Zhang
- Department of Cell and Molecular Biology, Tulane University, New Orleans, LA, United States
| | - Shusheng Wang
- Department of Cell and Molecular Biology, Tulane University, New Orleans, LA, United States
- Department of Ophthalmology, Tulane University, New Orleans, LA, United States
- Tulane Personalized Health Institute, Tulane University, New Orleans, LA, United States
- *Correspondence: Shusheng Wang,
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Lee S, Xu H, Van Vleck A, Mawla AM, Li AM, Ye J, Huising MO, Annes JP. β-Cell Succinate Dehydrogenase Deficiency Triggers Metabolic Dysfunction and Insulinopenic Diabetes. Diabetes 2022; 71:1439-1453. [PMID: 35472723 PMCID: PMC9233299 DOI: 10.2337/db21-0834] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Accepted: 03/26/2022] [Indexed: 11/20/2022]
Abstract
Mitochondrial dysfunction plays a central role in type 2 diabetes (T2D); however, the pathogenic mechanisms in pancreatic β-cells are incompletely elucidated. Succinate dehydrogenase (SDH) is a key mitochondrial enzyme with dual functions in the tricarboxylic acid cycle and electron transport chain. Using samples from human with diabetes and a mouse model of β-cell-specific SDH ablation (SDHBβKO), we define SDH deficiency as a driver of mitochondrial dysfunction in β-cell failure and insulinopenic diabetes. β-Cell SDH deficiency impairs glucose-induced respiratory oxidative phosphorylation and mitochondrial membrane potential collapse, thereby compromising glucose-stimulated ATP production, insulin secretion, and β-cell growth. Mechanistically, metabolomic and transcriptomic studies reveal that the loss of SDH causes excess succinate accumulation, which inappropriately activates mammalian target of rapamycin (mTOR) complex 1-regulated metabolic anabolism, including increased SREBP-regulated lipid synthesis. These alterations, which mirror diabetes-associated human β-cell dysfunction, are partially reversed by acute mTOR inhibition with rapamycin. We propose SDH deficiency as a contributing mechanism to the progressive β-cell failure of diabetes and identify mTOR complex 1 inhibition as a potential mitigation strategy.
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Affiliation(s)
- Sooyeon Lee
- Division of Endocrinology, Department of Medicine, Stanford University, Stanford, CA
| | - Haixia Xu
- Division of Endocrinology, Department of Medicine, Stanford University, Stanford, CA
| | - Aidan Van Vleck
- Division of Endocrinology, Department of Medicine, Stanford University, Stanford, CA
| | - Alex M. Mawla
- Department of Neurobiology, Physiology and Behavior, College of Biological Sciences, University of California, Davis, Davis, CA
| | - Albert Mao Li
- Department of Radiation Oncology, Stanford University School of Medicine, Stanford, CA
- Cancer Biology Program, Stanford University School of Medicine, Stanford, CA
| | - Jiangbin Ye
- Department of Radiation Oncology, Stanford University School of Medicine, Stanford, CA
- Cancer Biology Program, Stanford University School of Medicine, Stanford, CA
| | - Mark O. Huising
- Department of Neurobiology, Physiology and Behavior, College of Biological Sciences, University of California, Davis, Davis, CA
- Department of Physiology and Membrane Biology, School of Medicine, University of California, Davis, Davis, CA
| | - Justin P. Annes
- Division of Endocrinology, Department of Medicine, Stanford University, Stanford, CA
- Stanford ChEM-H and Diabetes Research Center, Stanford University School of Medicine, Stanford, CA
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40
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Recent Approaches to Determine Static and Dynamic Redox State-Related Parameters. Antioxidants (Basel) 2022; 11:antiox11050864. [PMID: 35624728 PMCID: PMC9137989 DOI: 10.3390/antiox11050864] [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: 03/01/2022] [Revised: 04/23/2022] [Accepted: 04/25/2022] [Indexed: 11/17/2022] Open
Abstract
Oxidative stress refers to an imbalance between oxidant and antioxidant molecules, which is usually associated with oxidative damage to biomolecules and mitochondrial malfunction. Redox state-related parameters include (1) the direct measurement of ROS, (2) the assessment of the antioxidant defense status, and (3) the analysis of the resulting oxidative damage to molecules. Directly measuring ROS appears to be the preferred method among scientists, but most ROS are extremely unstable and difficult to measure. The processes of determining both the oxidative damage to biomolecules and the antioxidant system status, although both are indirect approaches, provide a reliable method to measure oxidative stress on a given sample. Recently, the Seahorse XF and the Oroboros O2k systems have provided new insights into the redox state from a more dynamic point of view. These techniques assess mitochondrial oxidative phosphorylation function and bioenergetics on isolated mitochondria, cultured cells, or specific tissues such as permeabilized fibers. This review describes a range of methodologies to measure redox state-related parameters, their strengths, and their limitations. In conclusion, all these techniques are valid and none of them can be replaced by another. Indeed, they have the potential to complement each other for a complete evaluation of the redox state of a given sample.
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Verberk SG, de Goede KE, Gorki FS, van Dierendonck XA, Argüello RJ, Van den Bossche J. An integrated toolbox to profile macrophage immunometabolism. CELL REPORTS METHODS 2022; 2:100192. [PMID: 35497494 PMCID: PMC9046227 DOI: 10.1016/j.crmeth.2022.100192] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Revised: 12/23/2021] [Accepted: 03/07/2022] [Indexed: 10/25/2022]
Abstract
Macrophages are dynamic immune cells that can adopt several activation states. Fundamental to these functional activation states is the regulation of cellular metabolic processes. Especially in mice, metabolic alterations underlying pro-inflammatory or homeostatic phenotypes have been assessed using various techniques. However, researchers new to the field may encounter ambiguity in choosing which combination of techniques is best suited to profile immunometabolism. To address this need, we have developed a toolbox to assess cellular metabolism in a semi-high-throughput 96-well-plate-based format. Application of the toolbox to activated mouse and human macrophages enables fast metabolic pre-screening and robust measurement of extracellular fluxes, mitochondrial mass and membrane potential, and glucose and lipid uptake. Moreover, we propose an application of SCENITH technology for ex vivo metabolic profiling. We validate established activation-induced metabolic rewiring in mouse macrophages and report new insights into human macrophage metabolism. By thoroughly discussing each technique, we hope to guide readers with practical workflows for investigating immunometabolism.
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Affiliation(s)
- Sanne G.S. Verberk
- Department of Molecular Cell Biology and Immunology, Amsterdam Cardiovascular Sciences, Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam Institute for Infection and Immunity, Cancer Centre Amsterdam, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
| | - Kyra E. de Goede
- Department of Molecular Cell Biology and Immunology, Amsterdam Cardiovascular Sciences, Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam Institute for Infection and Immunity, Cancer Centre Amsterdam, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
| | - Friederike S. Gorki
- Department of Molecular Cell Biology and Immunology, Amsterdam Cardiovascular Sciences, Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam Institute for Infection and Immunity, Cancer Centre Amsterdam, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
- Institute of Innate Immunity, University Hospital Bonn, University of Bonn, 53127 Bonn, Germany
| | - Xanthe A.M.H. van Dierendonck
- Department of Molecular Cell Biology and Immunology, Amsterdam Cardiovascular Sciences, Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam Institute for Infection and Immunity, Cancer Centre Amsterdam, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
| | - Rafael J. Argüello
- Aix Marseille Univ, CNRS, INSERM, CIML, Centre d’Immunologie de Marseille-Luminy, Marseille, France
| | - Jan Van den Bossche
- Department of Molecular Cell Biology and Immunology, Amsterdam Cardiovascular Sciences, Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam Institute for Infection and Immunity, Cancer Centre Amsterdam, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
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Glutathione-dependent redox balance characterizes the distinct metabolic properties of follicular and marginal zone B cells. Nat Commun 2022; 13:1789. [PMID: 35379825 PMCID: PMC8980022 DOI: 10.1038/s41467-022-29426-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Accepted: 03/11/2022] [Indexed: 11/13/2022] Open
Abstract
The metabolic principles underlying the differences between follicular and marginal zone B cells (FoB and MZB, respectively) are not well understood. Here we show, by studying mice with B cell-specific ablation of the catalytic subunit of glutamate cysteine ligase (Gclc), that glutathione synthesis affects homeostasis and differentiation of MZB to a larger extent than FoB, while glutathione-dependent redox control contributes to the metabolic dependencies of FoB. Specifically, Gclc ablation in FoB induces metabolic features of wild-type MZB such as increased ATP levels, glucose metabolism, mTOR activation, and protein synthesis. Furthermore, Gclc-deficient FoB have a block in the mitochondrial electron transport chain (ETC) due to diminished complex I and II activity and thereby accumulate the tricarboxylic acid cycle metabolite succinate. Finally, Gclc deficiency hampers FoB activation and antibody responses in vitro and in vivo, and induces susceptibility to viral infections. Our results thus suggest that Gclc is required to ensure the development of MZB, the mitochondrial ETC integrity in FoB, and the efficacy of antiviral humoral immunity. Follicular and marginal zone B (FoB and MZB, respectively) cells have divergent metabolic characteristics. Here the authors show that deficiency of glutamate cysteine ligase (Gclc), the enzyme for glutathione synthesis, differentially impacts FoB and MZB homeostasis, while specifically impeding FoB activation and downstream antiviral immunity.
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Isei MO, Stevens D, Kamunde C. Copper modulates heart mitochondrial H 2O 2 emission differently during fatty acid and pyruvate oxidation. Comp Biochem Physiol C Toxicol Pharmacol 2022; 254:109267. [PMID: 35026399 DOI: 10.1016/j.cbpc.2022.109267] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 01/03/2022] [Accepted: 01/05/2022] [Indexed: 12/28/2022]
Abstract
Although the preferred cardiac metabolic fuels are fatty acids, glucose metabolism also plays an important role. However, irrespective of substrate type, energy generation results in mitochondrial reactive oxygen species (ROS) formation. To determine if the preference of fat over carbohydrates predisposes cardiomyocytes to oxidant production, we measured total and site-specific H2O2 emission in heart mitochondria oxidizing palmitoylcarnitine or pyruvate during copper (Cu) exposure. H2O2 emission was higher during oxidation of palmitoylcarnitine compared with pyruvate. Moreover, the bulk of the H2O2 emitted during palmitoylcarnitine oxidation originated from the outer ubiquinone binding site of complex III (site IIIQo) and the flavin site of electron transfer flavoprotein (site EF). We found no evidence of ROS production from complex I ubiquinone-binding site (site IQ) by reverse electron transport during oxidation of palmitoylcarnitine. Pyruvate oxidation also drove H2O2 emission primarily from sites IIIQo; however, the flavin sites of pyruvate dehydrogenase (site PF) and complex II (site IIF) contributed substantially. The effect of Cu depended on substrate and redox site, with effects at sites OF and IIIQo being more pronounced in mitochondria oxidizing pyruvate compared with palmitoylcarnitine. Cu imposed a concentration-saturable effect at site PF but concentration-dependently stimulated H2O2 emission at site EF. The substrate-dependent differences in H2O2 emission and effects of Cu suggest that fuel type and points of entry of electrons into the mitochondrial electron transport system determine the mitochondrial ROS production rate. Importantly, knowledge of sites of mitochondrial ROS production is crucial to the understanding of cardiac dysfunction associated with impaired substrate metabolism.
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Affiliation(s)
- Michael O Isei
- Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE C1A 4P3, Canada
| | - Don Stevens
- Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE C1A 4P3, Canada
| | - Collins Kamunde
- Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE C1A 4P3, Canada.
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Combining PEGylated mito-atovaquone with MCT and Krebs cycle redox inhibitors as a potential strategy to abrogate tumor cell proliferation. Sci Rep 2022; 12:5143. [PMID: 35332210 PMCID: PMC8948292 DOI: 10.1038/s41598-022-08984-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 03/14/2022] [Indexed: 11/26/2022] Open
Abstract
Glycolytic and mitochondrial oxidative metabolism, which are two major energy sources in tumors, are potential targets in cancer treatment. Metabolic reprogramming from glycolysis to mitochondrial oxidative metabolism and vice versa is an adaptive strategy with which tumor cells obtain energy to survive and thrive under the compromised conditions of glycolysis and mitochondrial respiration. Developing highly potent, nontoxic, and tumor-selective oxidative phosphorylation (OXPHOS) inhibitors may help advance therapeutic targeting of mitochondrial drugs in cancer. The FDA-approved antimalarial drug atovaquone (ATO), a mitochondrial complex III inhibitor, was repurposed in cancer treatment. Here, we developed a new class of PEGylated mitochondria-targeted ATO (Mito-(PEG)n-ATO). Depending on the PEGylation chain length (n), Mito-PEG-ATO analogs inhibit both mitochondrial complex I- and complex III-induced oxygen consumption in human pancreatic (MiaPaCa-2) and brain (U87MG) cancer cells. Mito-PEG5-ATO is one of the most potent antiproliferative mitochondria-targeted compounds (IC50 = 38 nM) in MiaPaCa-2 cells, and is more effective than other inhibitors of OXPHOS in MiaPaCa-2 and U87MG cells. Furthermore, we show that the combined use of the most potent OXPHOS-targeted inhibitors (Mito-PEG5-ATO) and inhibitors of monocarboxylate transporters (MCT-1 and MCT-4), Krebs cycle redox metabolism, or glutaminolysis will synergistically abrogate tumor cell proliferation. Potential clinical benefits of these combinatorial therapies are discussed.
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45
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Erny D, Dokalis N, Mezö C, Mossad O, Blank T, Prinz M. Flow-cytometry-based protocol to analyze respiratory chain function in mouse microglia. STAR Protoc 2022; 3:101186. [PMID: 35243376 PMCID: PMC8861812 DOI: 10.1016/j.xpro.2022.101186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Most of the protocols to analyze metabolic features of cell populations from different tissues rely on in vitro cell culture conditions. Here, we present a flow-cytometry-based protocol for measuring the respiratory chain function in permeabilized mouse microglia ex vivo. We describe microglial cell isolation, followed by analyzing complex I and II using flow cytometry. This optimized protocol requires a low input of permeabilized cells and can be applied to other ex vivo isolated cells or cells derived from cell cultures. For complete details on the use and execution of this protocol, please refer to Erny et al. (2021). Flow cytometry-based protocol to measure respiratory chain function ex vivo Optimized protocol requiring a low input of permeabilized cells Analysis of complex I and II in permeabilized mouse microglial cells Applicable for all kinds of ex vivo isolated cells or cells derived from cell cultures
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Affiliation(s)
- Daniel Erny
- Institute of Neuropathology, University of Freiburg, Freiburg, Germany
- Berta-Ottenstein-Programme, Faculty of Medicine, University of Freiburg, Freiburg im Breisgau, Germany
- Corresponding author
| | - Nikolaos Dokalis
- Institute of Neuropathology, University of Freiburg, Freiburg, Germany
- Faculty of Biology, University of Freiburg, Freiburg im Breisgau, Germany
| | - Charlotte Mezö
- Institute of Neuropathology, University of Freiburg, Freiburg, Germany
- Faculty of Biology, University of Freiburg, Freiburg im Breisgau, Germany
| | - Omar Mossad
- Institute of Neuropathology, University of Freiburg, Freiburg, Germany
- Faculty of Biology, University of Freiburg, Freiburg im Breisgau, Germany
| | - Thomas Blank
- Institute of Neuropathology, University of Freiburg, Freiburg, Germany
| | - Marco Prinz
- Institute of Neuropathology, University of Freiburg, Freiburg, Germany
- Center for Basics in NeuroModulation (NeuroModulBasics), Faculty of Medicine, University of Freiburg, Freiburg, Germany
- Signalling Research Centres BIOSS and CIBSS, University of Freiburg, Freiburg, Germany
- Corresponding author
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Abstract
![]()
Natural products
are the result of Nature’s exploration
of biologically relevant chemical space through evolution and an invaluable
source of bioactive small molecules for chemical biology and medicinal
chemistry. Novel concepts for the discovery of new bioactive compound
classes based on natural product structure may enable exploration
of wider biologically relevant chemical space. The pseudo-natural
product concept merges the relevance of natural product structure
with efficient exploration of chemical space by means of fragment-based
compound development to inspire the discovery of new bioactive chemical
matter through de novo combination of natural product
fragments in unprecedented arrangements. The novel scaffolds retain
the biological relevance of natural products but are not obtainable
through known biosynthetic pathways which can lead to new chemotypes
that may have unexpected or unprecedented bioactivities. Herein, we
cover the workflow of pseudo-natural product design and development,
highlight recent examples, and discuss a cheminformatic analysis in
which a significant portion of biologically active synthetic compounds
were found to be pseudo-natural products. We compare the concept to
natural evolution and discuss pseudo-natural products as the human-made
equivalent, i.e. the chemical evolution of natural product structure.
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Affiliation(s)
- Michael Grigalunas
- Max-Planck-Institute of Molecular Physiology, Otto-Hahn Strasse 11, 44227, Dortmund, Germany
| | - Susanne Brakmann
- Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn Strasse 4a, 44227, Dortmund, Germany
| | - Herbert Waldmann
- Max-Planck-Institute of Molecular Physiology, Otto-Hahn Strasse 11, 44227, Dortmund, Germany
- Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn Strasse 4a, 44227, Dortmund, Germany
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Analysis of Mitochondrial Function, Structure, and Intracellular Organization In Situ in Cardiomyocytes and Skeletal Muscles. Int J Mol Sci 2022; 23:ijms23042252. [PMID: 35216368 PMCID: PMC8876605 DOI: 10.3390/ijms23042252] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 01/31/2022] [Accepted: 02/07/2022] [Indexed: 01/27/2023] Open
Abstract
Analysis of the function, structure, and intracellular organization of mitochondria is important for elucidating energy metabolism and intracellular energy transfer. In addition, basic and clinically oriented studies that investigate organ/tissue/cell dysfunction in various human diseases, including myopathies, cardiac/brain ischemia-reperfusion injuries, neurodegenerative diseases, cancer, and aging, require precise estimation of mitochondrial function. It should be noted that the main metabolic and functional characteristics of mitochondria obtained in situ (in permeabilized cells and tissue samples) and in vitro (in isolated organelles) are quite different, thereby compromising interpretations of experimental and clinical data. These differences are explained by the existence of the mitochondrial network, which possesses multiple interactions between the cytoplasm and other subcellular organelles. Metabolic and functional crosstalk between mitochondria and extra-mitochondrial cellular environments plays a crucial role in the regulation of mitochondrial metabolism and physiology. Therefore, it is important to analyze mitochondria in vivo or in situ without their isolation from the natural cellular environment. This review summarizes previous studies and discusses existing approaches and methods for the analysis of mitochondrial function, structure, and intracellular organization in situ.
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Yu L, Lin Z, Cheng X, Chu J, Li X, Chen C, Zhu T, Li W, Lin W, Tang W. Thorium inhibits human respiratory chain complex IV (cytochrome c oxidase). JOURNAL OF HAZARDOUS MATERIALS 2022; 424:127546. [PMID: 34879532 DOI: 10.1016/j.jhazmat.2021.127546] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2021] [Revised: 10/15/2021] [Accepted: 10/15/2021] [Indexed: 06/13/2023]
Abstract
Thorium is a radioactive heavy metal and an emerging environmental pollutant. Ecological and human health risks from thorium exposure are growing with the excavation of rare earth metals and implementation of thorium-based nuclear reactors. Thorium poisoning is associated with carcinogenesis, liver impairments, and congenital anomalies. To date, the biomolecular targets that underlie thorium-induced toxicity remain unknown. Here, we used in vitro enzymatic activity assays to comprehensively evaluate the effects of thorium on the mitochondrial respiration process. Thorium was found to inhibit respiratory chain complex IV (cytochrome c oxidase) at sub-micromolar concentrations (IC50 ~ 0.4 μM, 90 μg/L). This is lower than the thorium level limit (246 μg/L) in drinking water specified by the World Health Organization. The inhibitory effects were further verified in mitochondria from human bone and liver cells (thorium mainly deposits in these organs). The inhibition of cytochrome c oxidase can readily rationalize well-documented cellular toxicities of thorium, such as alteration of mitochondrial membrane potential and production of reactive oxygen species. Therefore, cytochrome c oxidase is potentially a key molecular target underlying thorium-induced toxicological effect.
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Affiliation(s)
- Libing Yu
- Institute of Materials, China Academy of Engineering Physics, Mianyang 621907, China.
| | - Zhaozhu Lin
- Department of Pathogen Biology, School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Xuedan Cheng
- Institute of Materials, China Academy of Engineering Physics, Mianyang 621907, China; School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
| | - Jian Chu
- Institute of Materials, China Academy of Engineering Physics, Mianyang 621907, China
| | - Xijian Li
- Institute of Materials, China Academy of Engineering Physics, Mianyang 621907, China
| | - Chun Chen
- Institute of Materials, China Academy of Engineering Physics, Mianyang 621907, China
| | - Tinghua Zhu
- Guizhou Shengyada Biotech Co., Ltd., Guiyang 550000, China
| | - Wenjing Li
- Institute of Materials, China Academy of Engineering Physics, Mianyang 621907, China; School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
| | - Wei Lin
- Department of Pathogen Biology, School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China.
| | - Wei Tang
- Institute of Materials, China Academy of Engineering Physics, Mianyang 621907, China.
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Floudas A, Neto N, Orr C, Canavan M, Gallagher P, Hurson C, Monaghan MG, Nagpar S, Mullan RH, Veale DJ, Fearon U. Loss of balance between protective and pro-inflammatory synovial tissue T-cell polyfunctionality predates clinical onset of rheumatoid arthritis. Ann Rheum Dis 2022; 81:193-205. [PMID: 34598926 DOI: 10.1136/annrheumdis-2021-220458] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Accepted: 09/10/2021] [Indexed: 01/25/2023]
Abstract
OBJECTIVES This study investigates pathogenic and protective polyfunctional T-cell responses in patient with rheumatoid arthritis (RA), individuals at risk (IAR) and healthy control (HC) synovial-tissue biopsies and identifies the presence of a novel population of pathogenic polyfunctional T-cells that are enriched in the RA joint prior to the development of clinical inflammation. METHODS Pathway enrichment analysis of previously obtained RNAseq data of synovial biopsies from RA (n=118), IAR (n=20) and HC (n=44) was performed. Single-cell synovial tissue suspensions from RA (n=10), IAR (n=7) and HC (n=7) and paired peripheral blood mononuclear cells (PBMC) were stimulated in vitro and polyfunctional synovial T-cell subsets examined by flow cytometric analysis, simplified presentation of incredibly complex evaluations (SPICE) and FlowSom clustering. Flow-imaging was utilised to confirm specific T-cell cluster identification. Fluorescent lifetime imaging microscopy (FLIM) was used to visualise metabolic status of sorted T-cell populations. RESULTS Increased plasticity of Tfh cells and CD4 T-cell polyfunctionality with enriched memory Treg cell responses was demonstrated in RA patient synovial tissue. Synovial-tissue RNAseq analysis reveals that enrichment in T-cell activation and differentiation pathways pre-dates the onset of RA. Switch from potentially protective IL-4 and granulocyte macrophage colony stimulating factor (GMCSF) dominated polyfunctional CD4 T-cell responses towards pathogenic polyfunctionality is evident in patient with IAR and RA synovial tissue. Cluster analysis reveals the accumulation of highly polyfunctional CD4+ CD8dim T-cells in IAR and RA but not HC synovial tissue. CD4+ CD8dim T-cells show increased utilisation of oxidative phosphorylation, a characteristic of metabolically primed memory T-cells. Frequency of synovial CD4+ CD8dim T-cells correlates with RA disease activity. CONCLUSION Switch from potentially protective to pathogenic T-cell polyfunctionality pre-dates the onset of clinical inflammation and constitutes an opportunity for therapeutic intervention in RA.
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Affiliation(s)
- Achilleas Floudas
- Department of Molecular Rheumatology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
| | - Nuno Neto
- Department of Mechanical and Manufacturing Engineering, Trinity College Dublin, Dublin, Ireland.,Department of Mechanical and Manufacturing Engineering, Trinity College Dublin, Dublin, Ireland
| | - Carl Orr
- Department of Rheumatology, EULAR Centre of excellence, Centre for Arthritis and Rheumatic Diseases, St Vincent's University Hospital, UCD, Dublin, Ireland
| | - Mary Canavan
- Department of Molecular Rheumatology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
| | - Phil Gallagher
- Department of Orthopaedics, St Vincent's University Hospital, Dublin, Ireland
| | - Conor Hurson
- Department of Orthopaedics, St Vincent's University Hospital, Dublin, Ireland
| | - Michael G Monaghan
- Department of Mechanical and Manufacturing Engineering, Trinity College Dublin, Dublin, Ireland
| | - Sunil Nagpar
- Department of Immunology, Janssen Research & Development, Immunology, Philadelphia, Pennsylvania, USA
| | - Ronan H Mullan
- Department of Rheumatology, Tallaght University Hospital, Dublin, Dublin, Ireland
| | - Douglas J Veale
- Department of Rheumatology, EULAR Centre of excellence, Centre for Arthritis and Rheumatic Diseases, St Vincent's University Hospital, UCD, Dublin, Ireland
| | - Ursula Fearon
- Department of Molecular Rheumatology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
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Mahalaxmi G, Ashok S, Arun G, Srinivas G. Albumin binds to uncoupler CCCP to diminish depolarization of mitochondria. Toxicol In Vitro 2022; 80:105325. [PMID: 35121064 DOI: 10.1016/j.tiv.2022.105325] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 01/14/2022] [Accepted: 01/27/2022] [Indexed: 11/19/2022]
Abstract
Mitochondria are at the core of cellular energy metabolism and are also involved in the oxidative stress response and programmed cell death pathways. Mitochondrial dysfunction is found to be associated with many disease conditions like metabolic syndrome, neurodegenerative disorders, coronary artery diseases, cancer, etc. This has generated considerable interest in the scientific community over the assessment of mitochondrial function and mitochondrial damage. One of the most common methodologies in these studies is by analysing the mitochondrial activity in the presence of mitochondrial substrates, inhibitors and uncouplers. Apart from the specific effects of these molecules on mitochondria, their interactions with the components of the experimental system could interfere with the results derived. Therefore, the role some specific experimental conditions would have on the outcome should be carefully elucidated. Fetal Bovine Serum or Bovine Serum Albumin (BSA); routinely used in in vitro experiments for their growth promoting and surfactant properties; can have profound impact on the pharmacokinetics of chemical compounds as albumin residue can bind to and affect their bioavailability. In the present study, we demonstrate that Carbonyl cyanide 3-chlorophenylhydrazone (CCCP) induced mitochondrial depolarization is hindered in the presence of albumin due to the molecular interaction between CCCP and albumin.
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Affiliation(s)
- Ganjoo Mahalaxmi
- Department of Biochemistry, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Trivandrum 695011, Kerala, India
| | - Sivasailam Ashok
- Department of Biochemistry, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Trivandrum 695011, Kerala, India
| | - Gangadharan Arun
- Department of Biotechnology and Microbiology, Kannur University, Kerala, India
| | - Gopala Srinivas
- Department of Biochemistry, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Trivandrum 695011, Kerala, India.
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