1
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Dell'Anno I, Morani F, Patergnani S, Daga A, Pinton P, Giorgi C, Mutti L, Gemignani F, Landi S. Thonzonium bromide inhibits progression of malignant pleural mesothelioma through regulation of ERK1/2 and p38 pathways and mitochondrial uncoupling. Cancer Cell Int 2024; 24:226. [PMID: 38951927 DOI: 10.1186/s12935-024-03400-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Accepted: 06/08/2024] [Indexed: 07/03/2024] Open
Abstract
BACKGROUND Malignant Pleural Mesothelioma (MPM) is a rare malignancy with a poor prognosis. Current therapies are unsatisfactory and novel cures are urgently needed. In a previous drug screening, we identified thonzonium bromide (TB) as one of the most active compounds against MPM cells. Since the biological effects of TB are poorly known, in this work we departed from some hints of previous studies and investigated several hypotheses. Moreover, we evaluated the efficacy of TB in an in vivo xenograft rodent model. METHODS In vitro assessment was made on five MPM (Mero-14, Mero-25, Ren, NCI-H28, MSTO-211H) and one SV40-immortalized mesothelial cell line (MeT-5A). We evaluated TB ability to affect proliferation, apoptosis, mitochondrial functions and metabolism, and the mevalonate pathway. In vivo assay was carried out on MPM-xenograft NOD-SCID mice (4 mg/kg delivered intraperitoneally, twice a week for 4 weeks) and the overall survival was analysed with Kaplan-Meier curves. RESULTS After TB treatment, we observed the suppression of ERK 1/2 phosphorylation, the increase of BAX expression and p38 phosphorylation. TB affected Ca2+ homeostasis in both mitochondrial and cytosolic compartments, it regulated the mitochondrial functioning, respiration, and ATP production as well as the mevalonate pathway. The in vivo study showed an increased overall survival for TB treated group vs. vehicle control group (P = 0.0076). CONCLUSIONS Both in vitro and in vivo results confirmed the effect of TB on MPM and unravelled novel targets with translational potential.
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Affiliation(s)
| | | | - Simone Patergnani
- Department of Medical Sciences, Section of Experimental Medicine, Laboratory for Advanced Therapies (LTTA), Technopole of Ferrara, Ferrara, Italy
| | - Antonio Daga
- IRCCS, Ospedale Policlinico San Martino, Genoa, Italy
| | - Paolo Pinton
- Department of Medical Sciences, Section of Experimental Medicine, Laboratory for Advanced Therapies (LTTA), Technopole of Ferrara, Ferrara, Italy
| | - Carlotta Giorgi
- Department of Medical Sciences, Section of Experimental Medicine, Laboratory for Advanced Therapies (LTTA), Technopole of Ferrara, Ferrara, Italy
| | - Luciano Mutti
- Sbarro Institute for Cancer Research and Molecular Medicine, Center for Biotechnology, College of Science and Technology, Temple University, Philadelphia, USA.
- Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, L'Aquila, Italy.
| | | | - Stefano Landi
- Department of Biology, University of Pisa, Pisa, Italy.
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2
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Mesa D, Barbieri E, Raimondi A, Freddi S, Miloro G, Jendrisek G, Caldieri G, Quarto M, Schiano Lomoriello I, Malabarba MG, Bresci A, Manetti F, Vernuccio F, Abdo H, Scita G, Lanzetti L, Polli D, Tacchetti C, Pinton P, Bonora M, Di Fiore PP, Sigismund S. A tripartite organelle platform links growth factor receptor signaling to mitochondrial metabolism. Nat Commun 2024; 15:5119. [PMID: 38879572 PMCID: PMC11180189 DOI: 10.1038/s41467-024-49543-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Accepted: 06/08/2024] [Indexed: 06/19/2024] Open
Abstract
One open question in the biology of growth factor receptors is how a quantitative input (i.e., ligand concentration) is decoded by the cell to produce specific response(s). Here, we show that an EGFR endocytic mechanism, non-clathrin endocytosis (NCE), which is activated only at high ligand concentrations and targets receptor to degradation, requires a tripartite organelle platform involving the plasma membrane (PM), endoplasmic reticulum (ER) and mitochondria. At these contact sites, EGFR-dependent, ER-generated Ca2+ oscillations are sensed by mitochondria, leading to increased metabolism and ATP production. Locally released ATP is required for cortical actin remodeling and EGFR-NCE vesicle fission. The same biochemical circuitry is also needed for an effector function of EGFR, i.e., collective motility. The multiorganelle signaling platform herein described mediates direct communication between EGFR signaling and mitochondrial metabolism, and is predicted to have a broad impact on cell physiology as it is activated by another growth factor receptor, HGFR/MET.
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Affiliation(s)
- Deborah Mesa
- Department of Oncology and Hematology-Oncology, Università degli Studi di Milano, Milan, Italy
- IEO, European Institute of Oncology IRCCS, Milan, Italy
| | | | - Andrea Raimondi
- Experimental Imaging Centre, IRCCS San Raffaele Hospital Scientific Institute, Milan, Italy
- Università della Svizzera italiana (USI), Faculty of Biomedical Sciences, Institute for Research in Biomedicine, Bellinzona, Switzerland
| | - Stefano Freddi
- Department of Oncology and Hematology-Oncology, Università degli Studi di Milano, Milan, Italy
- IEO, European Institute of Oncology IRCCS, Milan, Italy
| | | | - Gorana Jendrisek
- Department of Oncology and Hematology-Oncology, Università degli Studi di Milano, Milan, Italy
- IEO, European Institute of Oncology IRCCS, Milan, Italy
| | | | - Micaela Quarto
- Department of Oncology and Hematology-Oncology, Università degli Studi di Milano, Milan, Italy
- IEO, European Institute of Oncology IRCCS, Milan, Italy
| | - Irene Schiano Lomoriello
- Department of Oncology and Hematology-Oncology, Università degli Studi di Milano, Milan, Italy
- IEO, European Institute of Oncology IRCCS, Milan, Italy
| | - Maria Grazia Malabarba
- Department of Oncology and Hematology-Oncology, Università degli Studi di Milano, Milan, Italy
- IEO, European Institute of Oncology IRCCS, Milan, Italy
| | - Arianna Bresci
- Department of Physics, Politecnico di Milano, Milan, Italy
| | | | | | - Hind Abdo
- IFOM, The AIRC Institute of Molecular Oncology, Milan, Italy
| | - Giorgio Scita
- Department of Oncology and Hematology-Oncology, Università degli Studi di Milano, Milan, Italy
- IFOM, The AIRC Institute of Molecular Oncology, Milan, Italy
| | - Letizia Lanzetti
- Department of Oncology, University of Torino Medical School, Candiolo, Turin, Italy
- Candiolo Cancer Institute, FPO-IRCCS, Candiolo, Turin, Italy
| | - Dario Polli
- Department of Physics, Politecnico di Milano, Milan, Italy
- CNR Institute for Photonics and Nanotechnology (CNR-IFN), Milan, Italy
| | - Carlo Tacchetti
- Experimental Imaging Centre, IRCCS San Raffaele Hospital Scientific Institute, Milan, Italy
- Vita-Salute San Raffaele University, Milan, Italy
| | - Paolo Pinton
- Department of Medical Sciences, Section of Experimental Medicine and Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - Massimo Bonora
- Department of Medical Sciences, Section of Experimental Medicine and Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - Pier Paolo Di Fiore
- Department of Oncology and Hematology-Oncology, Università degli Studi di Milano, Milan, Italy.
- IEO, European Institute of Oncology IRCCS, Milan, Italy.
| | - Sara Sigismund
- Department of Oncology and Hematology-Oncology, Università degli Studi di Milano, Milan, Italy.
- IEO, European Institute of Oncology IRCCS, Milan, Italy.
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3
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Licini C, Morroni G, Lucarini G, Vitto VAM, Orlando F, Missiroli S, D'Achille G, Perrone M, Spadoni T, Graciotti L, Bigossi G, Provinciali M, Offidani A, Mattioli-Belmonte M, Cirioni O, Pinton P, Simonetti O, Marchi S. ER-mitochondria association negatively affects wound healing by regulating NLRP3 activation. Cell Death Dis 2024; 15:407. [PMID: 38862500 PMCID: PMC11167056 DOI: 10.1038/s41419-024-06765-9] [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: 02/01/2024] [Revised: 05/14/2024] [Accepted: 05/21/2024] [Indexed: 06/13/2024]
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) is the most common causative agent of acute bacterial skin and skin-structure infections (ABSSSI), one of the major challenges to the health system worldwide. Although the use of antibiotics as the first line of intervention for MRSA-infected wounds is recommended, important side effects could occur, including cytotoxicity or immune dysregulation, thus affecting the repair process. Here, we show that the oxazolidinone antibiotic linezolid (LZD) impairs wound healing by aberrantly increasing interleukin 1 β (IL-1β) production in keratinocytes. Mechanistically, LZD triggers a reactive oxygen species (ROS)-independent mitochondrial damage that culminates in increased tethering between the endoplasmic reticulum (ER) and mitochondria, which in turn activates the NLR family pyrin domain-containing 3 (NLRP3) inflammasome complex by promoting its assembly to the mitochondrial surface. Downregulation of ER-mitochondria contact formation is sufficient to inhibit the LZD-driven NLRP3 inflammasome activation and IL-1β production, restoring wound closure. These results identify the ER-mitochondria association as a key factor for NLRP3 activation and reveal a new mechanism in the regulation of the wound healing process that might be clinically relevant.
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Affiliation(s)
- Caterina Licini
- Department of Clinical and Molecular Sciences, Marche Polytechnic University, Ancona, Italy
| | - Gianluca Morroni
- Microbiology Unit, Department of Biomedical Sciences and Public Health, Marche Polytechnic University, Ancona, Italy
| | - Guendalina Lucarini
- Department of Clinical and Molecular Sciences, Marche Polytechnic University, Ancona, Italy
| | - Veronica Angela Maria Vitto
- Department of Medical Sciences, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - Fiorenza Orlando
- Experimental Animal Models for Aging Research, Scientific Technological Area, IRCCS INRCA, 60121, Ancona, Italy
| | - Sonia Missiroli
- Department of Medical Sciences, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - Gloria D'Achille
- Microbiology Unit, Department of Biomedical Sciences and Public Health, Marche Polytechnic University, Ancona, Italy
| | - Mariasole Perrone
- Department of Medical Sciences, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - Tatiana Spadoni
- Department of Biomedical Sciences and Public Health, Marche Polytechnic University, Ancona, Italy
| | - Laura Graciotti
- Department of Biomedical Sciences and Public Health, Marche Polytechnic University, Ancona, Italy
| | - Giorgia Bigossi
- Advanced Technology Center for Aging Research, IRCCS INRCA, 60121, Ancona, Italy
| | - Mauro Provinciali
- Advanced Technology Center for Aging Research, IRCCS INRCA, 60121, Ancona, Italy
| | - Annamaria Offidani
- Clinic of Dermatology, Department of Clinical and Molecular Sciences, Marche Polytechnic University, Ancona, Italy
| | - Monica Mattioli-Belmonte
- Department of Clinical and Molecular Sciences, Marche Polytechnic University, Ancona, Italy
- Advanced Technology Center for Aging Research, IRCCS INRCA, 60121, Ancona, Italy
| | - Oscar Cirioni
- Clinic of Infectious Diseases, Department of Biomedical Sciences and Public Health, Marche Polytechnic University, Ancona, Italy
| | - Paolo Pinton
- Department of Medical Sciences, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - Oriana Simonetti
- Clinic of Dermatology, Department of Clinical and Molecular Sciences, Marche Polytechnic University, Ancona, Italy.
| | - Saverio Marchi
- Department of Clinical and Molecular Sciences, Marche Polytechnic University, Ancona, Italy.
- Advanced Technology Center for Aging Research, IRCCS INRCA, 60121, Ancona, Italy.
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4
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Patergnani S, Bataillard MS, Danese A, Alves S, Cazevieille C, Valéro R, Tranebjærg L, Maurice T, Pinton P, Delprat B, Richard EM. The Wolfram-like variant WFS1 E864K destabilizes MAM and compromises autophagy and mitophagy in human and mice. Autophagy 2024:1-12. [PMID: 38651637 DOI: 10.1080/15548627.2024.2341588] [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: 10/04/2023] [Accepted: 04/08/2024] [Indexed: 04/25/2024] Open
Abstract
Dominant variants in WFS1 (wolframin ER transmembrane glycoprotein), the gene coding for a mitochondria-associated endoplasmic reticulum (ER) membrane (MAM) resident protein, have been associated with Wolfram-like syndrome (WLS). In vitro and in vivo, WFS1 loss results in reduced ER to mitochondria calcium (Ca2+) transfer, mitochondrial dysfunction, and enhanced macroautophagy/autophagy and mitophagy. However, in the WLS pathological context, whether the mutant protein triggers the same cellular processes is unknown. Here, we show that in human fibroblasts and murine neuronal cultures the WLS protein WFS1E864K leads to decreases in mitochondria bioenergetics and Ca2+ uptake, deregulation of the mitochondrial quality system mechanisms, and alteration of the autophagic flux. Moreover, in the Wfs1E864K mouse, these alterations are concomitant with a decrease of MAM number. These findings reveal pathophysiological similarities between WS and WLS, highlighting the importance of WFS1 for MAM's integrity and functionality. It may open new treatment perspectives for patients with WLS.Abbreviations: BafA1: bafilomycin A1; ER: endoplasmic reticulum; HSPA9/GRP75: heat shock protein family A (Hsp70) member 9; ITPR/IP3R: inositol 1,4,5-trisphosphate receptor; MAM: mitochondria-associated endoplasmic reticulum membrane; MCU: mitochondrial calcium uniporter; MFN2: mitofusin 2; OCR: oxygen consumption rate; ROS: reactive oxygen species; ROT/AA: rotenone+antimycin A; VDAC1: voltage dependent anion channel 1; WLS: Wolfram-like syndrome; WS: Wolfram syndrome; WT: wild-type.
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Affiliation(s)
- Simone Patergnani
- Department of Medical Sciences, Section of Experimental Medicine, Technopole of Ferrara, Laboratory for Advanced Therapies (LTTA), Ferrara, Italy
| | | | - Alberto Danese
- Department of Medical Sciences, Section of Experimental Medicine, Technopole of Ferrara, Laboratory for Advanced Therapies (LTTA), Ferrara, Italy
| | - Stacy Alves
- MMDN, University Montpellier, EPHE, INSERM, Montpellier, France
| | | | - René Valéro
- Department of Nutrition, Metabolic Diseases and Endocrinology, Aix Marseille Univ, APHM, INSERM, INRAE, C2VN, University Hospital La Conception, Marseille, France
| | - Lisbeth Tranebjærg
- The Kennedy Center, Department of Clinical Genetics, Copenhagen University Hospital, Copenhagen, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Tangui Maurice
- MMDN, University Montpellier, EPHE, INSERM, Montpellier, France
| | - Paolo Pinton
- Department of Medical Sciences, Section of Experimental Medicine, Technopole of Ferrara, Laboratory for Advanced Therapies (LTTA), Ferrara, Italy
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5
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You W, Li Y, Liu K, Mi X, Li Y, Guo X, Li Z. Latest assessment methods for mitochondrial homeostasis in cognitive diseases. Neural Regen Res 2024; 19:754-768. [PMID: 37843209 PMCID: PMC10664105 DOI: 10.4103/1673-5374.382222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 06/03/2023] [Accepted: 07/06/2023] [Indexed: 10/17/2023] Open
Abstract
Mitochondria play an essential role in neural function, such as supporting normal energy metabolism, regulating reactive oxygen species, buffering physiological calcium loads, and maintaining the balance of morphology, subcellular distribution, and overall health through mitochondrial dynamics. Given the recent technological advances in the assessment of mitochondrial structure and functions, mitochondrial dysfunction has been regarded as the early and key pathophysiological mechanism of cognitive disorders such as Alzheimer's disease, Parkinson's disease, Huntington's disease, mild cognitive impairment, and postoperative cognitive dysfunction. This review will focus on the recent advances in mitochondrial medicine and research methodology in the field of cognitive sciences, from the perspectives of energy metabolism, oxidative stress, calcium homeostasis, and mitochondrial dynamics (including fission-fusion, transport, and mitophagy).
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Affiliation(s)
- Wei You
- Department of Anesthesiology, Peking University Third Hospital, Beijing, China
- Peking University Third Clinical Medical College, Beijing, China
| | - Yue Li
- Department of Anesthesiology, Peking University Third Hospital, Beijing, China
| | - Kaixi Liu
- Department of Anesthesiology, Peking University Third Hospital, Beijing, China
| | - Xinning Mi
- Department of Anesthesiology, Peking University Third Hospital, Beijing, China
| | - Yitong Li
- Department of Anesthesiology, Peking University Third Hospital, Beijing, China
| | - Xiangyang Guo
- Department of Anesthesiology, Peking University Third Hospital, Beijing, China
- Beijing Center of Quality Control and Improvement on Clinical Anesthesia, Beijing, China
- Anesthesia and Perioperative Medicine Branch of China International Exchange and Promotive Association for Medical and Health Care (CPAM), Beijing, China
| | - Zhengqian Li
- Department of Anesthesiology, Peking University Third Hospital, Beijing, China
- Beijing Center of Quality Control and Improvement on Clinical Anesthesia, Beijing, China
- Anesthesia and Perioperative Medicine Branch of China International Exchange and Promotive Association for Medical and Health Care (CPAM), Beijing, China
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6
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Wilson EL, Yu Y, Leal NS, Woodward JA, Patikas N, Morris JL, Field SF, Plumbly W, Paupe V, Chowdhury SR, Antrobus R, Lindop GE, Adia YM, Loh SHY, Prudent J, Martins LM, Metzakopian E. Genome-wide CRISPR/Cas9 screen shows that loss of GET4 increases mitochondria-endoplasmic reticulum contact sites and is neuroprotective. Cell Death Dis 2024; 15:203. [PMID: 38467609 PMCID: PMC10928201 DOI: 10.1038/s41419-024-06568-y] [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: 06/26/2023] [Revised: 02/13/2024] [Accepted: 02/19/2024] [Indexed: 03/13/2024]
Abstract
Organelles form membrane contact sites between each other, allowing for the transfer of molecules and signals. Mitochondria-endoplasmic reticulum (ER) contact sites (MERCS) are cellular subdomains characterized by close apposition of mitochondria and ER membranes. They have been implicated in many diseases, including neurodegenerative, metabolic, and cardiac diseases. Although MERCS have been extensively studied, much remains to be explored. To uncover novel regulators of MERCS, we conducted a genome-wide, flow cytometry-based screen using an engineered MERCS reporter cell line. We found 410 genes whose downregulation promotes MERCS and 230 genes whose downregulation decreases MERCS. From these, 29 genes were selected from each population for arrayed screening and 25 were validated from the high population and 13 from the low population. GET4 and BAG6 were highlighted as the top 2 genes that upon suppression increased MERCS from both the pooled and arrayed screens, and these were subjected to further investigation. Multiple microscopy analyses confirmed that loss of GET4 or BAG6 increased MERCS. GET4 and BAG6 were also observed to interact with the known MERCS proteins, inositol 1,4,5-trisphosphate receptors (IP3R) and glucose-regulated protein 75 (GRP75). In addition, we found that loss of GET4 increased mitochondrial calcium uptake upon ER-Ca2+ release and mitochondrial respiration. Finally, we show that loss of GET4 rescues motor ability, improves lifespan and prevents neurodegeneration in a Drosophila model of Alzheimer's disease (Aβ42Arc). Together, these results suggest that GET4 is involved in decreasing MERCS and that its loss is neuroprotective.
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Affiliation(s)
- Emma L Wilson
- UK Dementia Research Institute, University of Cambridge, Clifford Albutt building, Cambridge biomedical campus, Cambridge, CB2 0AH, UK
- MRC Mitochondrial Biology Unit, University of Cambridge, The Keith Peters building, Cambridge Biomedical Campus, Cambridge, CB2 0XY, UK
- MRC Toxicology Unit, University of Cambridge, Gleeson Building, Tennis Court Road, Cambridge, CB2 1QR, UK
| | - Yizhou Yu
- MRC Toxicology Unit, University of Cambridge, Gleeson Building, Tennis Court Road, Cambridge, CB2 1QR, UK
| | - Nuno S Leal
- MRC Toxicology Unit, University of Cambridge, Gleeson Building, Tennis Court Road, Cambridge, CB2 1QR, UK
| | - James A Woodward
- MRC Toxicology Unit, University of Cambridge, Gleeson Building, Tennis Court Road, Cambridge, CB2 1QR, UK
| | - Nikolaos Patikas
- UK Dementia Research Institute, University of Cambridge, Clifford Albutt building, Cambridge biomedical campus, Cambridge, CB2 0AH, UK
| | - Jordan L Morris
- MRC Mitochondrial Biology Unit, University of Cambridge, The Keith Peters building, Cambridge Biomedical Campus, Cambridge, CB2 0XY, UK
| | - Sarah F Field
- UK Dementia Research Institute, University of Cambridge, Clifford Albutt building, Cambridge biomedical campus, Cambridge, CB2 0AH, UK
| | - William Plumbly
- UK Dementia Research Institute, University of Cambridge, Clifford Albutt building, Cambridge biomedical campus, Cambridge, CB2 0AH, UK
| | - Vincent Paupe
- MRC Mitochondrial Biology Unit, University of Cambridge, The Keith Peters building, Cambridge Biomedical Campus, Cambridge, CB2 0XY, UK
| | - Suvagata R Chowdhury
- MRC Mitochondrial Biology Unit, University of Cambridge, The Keith Peters building, Cambridge Biomedical Campus, Cambridge, CB2 0XY, UK
| | - Robin Antrobus
- Cambridge Institute for Medical Research, University of Cambridge, The Keith Peters Building, Cambridge Biomedical Campus, Hills Rd, Cambridge, CB2 0XY, UK
| | - Georgina E Lindop
- Cambridge Advanced Imaging Centre, University of Cambridge, Anatomy Building, Downing Site, Cambridge, CB2 3DY, UK
| | - Yusuf M Adia
- 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
| | - Julien Prudent
- MRC Mitochondrial Biology Unit, University of Cambridge, The Keith Peters building, Cambridge Biomedical Campus, Cambridge, CB2 0XY, UK.
| | - L Miguel Martins
- MRC Toxicology Unit, University of Cambridge, Gleeson Building, Tennis Court Road, Cambridge, CB2 1QR, UK.
| | - Emmanouil Metzakopian
- UK Dementia Research Institute, University of Cambridge, Clifford Albutt building, Cambridge biomedical campus, Cambridge, CB2 0AH, UK.
- bit bio, The Dorothy Hodgkin Building, Babraham Research Campus, Cambridge, CB22 3FH, UK.
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7
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Sneyers F, Speelman-Rooms F, Verhelst SHL, Bootman MD, Bultynck G. Cellular effects of BAPTA: Are they only about Ca 2+ chelation? BIOCHIMICA ET BIOPHYSICA ACTA. MOLECULAR CELL RESEARCH 2024; 1871:119589. [PMID: 37739271 DOI: 10.1016/j.bbamcr.2023.119589] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 09/06/2023] [Accepted: 09/10/2023] [Indexed: 09/24/2023]
Abstract
Intracellular Ca2+ signals play a vital role in a broad range of cell biological and physiological processes in all eukaryotic cell types. Dysregulation of Ca2+ signaling has been implicated in numerous human diseases. Over the past four decades, the understanding of how cells use Ca2+ as a messenger has flourished, largely because of the development of reporters that enable visualization of Ca2+ signals in different cellular compartments, and tools that can modulate cellular Ca2+ signaling. One such tool that is frequently used is BAPTA; a fast, high-affinity Ca2+-chelating molecule. By making use of a cell-permeable acetoxymethyl ester (AM) variant, BAPTA can be readily loaded into the cytosol of cells (referred to as BAPTAi), where it is trapped and able to buffer changes in cytosolic Ca2+. Due to the ease of loading of the AM version of BAPTA, this reagent has been used in hundreds of studies to probe the role of Ca2+ signaling in specific processes. As such, for decades, researchers have almost universally attributed changes in biological processes caused by BAPTAi to the involvement of Ca2+ signaling. However, BAPTAi has often been used without any form of control, and in many cases has neither been shown to be retained in cells for the duration of experiments nor to buffer any Ca2+ signals. Moreover, increasing evidence points to off-target cellular effects of BAPTA that are clearly not related to Ca2+ chelation. Here, we briefly introduce Ca2+ signaling and the history of Ca2+ chelators and fluorescent Ca2+ indicators. We highlight Ca2+-independent effects of BAPTAi on a broad range of molecular targets and describe some of BAPTAi's impacts on cell functions that occur independently of its Ca2+-chelating properties. Finally, we propose strategies for determining whether Ca2+ chelation, the binding of other metal ions, or off-target interactions with cell components are responsible for BAPTAi's effect on a particular process and suggest some future research directions.
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Affiliation(s)
- Flore Sneyers
- KU Leuven, Lab. Molecular & Cellular Signaling, Dep. Cellular & Molecular Medicine, Campus Gasthuisberg O/N-I bus 802, Herestraat 49, B-3000 Leuven, Belgium
| | - Femke Speelman-Rooms
- KU Leuven, Lab. Molecular & Cellular Signaling, Dep. Cellular & Molecular Medicine, Campus Gasthuisberg O/N-I bus 802, Herestraat 49, B-3000 Leuven, Belgium; KU Leuven, Department of Cellular and Molecular Medicine, Laboratory of Chemical Biology, Herestraat 49 box 901b, B-3000 Leuven, Belgium
| | - Steven H L Verhelst
- KU Leuven, Department of Cellular and Molecular Medicine, Laboratory of Chemical Biology, Herestraat 49 box 901b, B-3000 Leuven, Belgium
| | - Martin D Bootman
- The Open University, Cancer Research Group, School of Life, Health and Chemical Sciences, Milton Keynes, UK
| | - Geert Bultynck
- KU Leuven, Lab. Molecular & Cellular Signaling, Dep. Cellular & Molecular Medicine, Campus Gasthuisberg O/N-I bus 802, Herestraat 49, B-3000 Leuven, Belgium.
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8
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Janer A, Morris JL, Krols M, Antonicka H, Aaltonen MJ, Lin ZY, Anand H, Gingras AC, Prudent J, Shoubridge EA. ESYT1 tethers the ER to mitochondria and is required for mitochondrial lipid and calcium homeostasis. Life Sci Alliance 2024; 7:e202302335. [PMID: 37931956 PMCID: PMC10627786 DOI: 10.26508/lsa.202302335] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Revised: 10/25/2023] [Accepted: 10/26/2023] [Indexed: 11/08/2023] Open
Abstract
Mitochondria interact with the ER at structurally and functionally specialized membrane contact sites known as mitochondria-ER contact sites (MERCs). Combining proximity labelling (BioID), co-immunoprecipitation, confocal microscopy and subcellular fractionation, we found that the ER resident SMP-domain protein ESYT1 was enriched at MERCs, where it forms a complex with the outer mitochondrial membrane protein SYNJ2BP. BioID analyses using ER-targeted, outer mitochondrial membrane-targeted, and MERC-targeted baits, confirmed the presence of this complex at MERCs and the specificity of the interaction. Deletion of ESYT1 or SYNJ2BP reduced the number and length of MERCs. Loss of the ESYT1-SYNJ2BP complex impaired ER to mitochondria calcium flux and provoked a significant alteration of the mitochondrial lipidome, most prominently a reduction of cardiolipins and phosphatidylethanolamines. Both phenotypes were rescued by reexpression of WT ESYT1 and an artificial mitochondria-ER tether. Together, these results reveal a novel function for ESYT1 in mitochondrial and cellular homeostasis through its role in the regulation of MERCs.
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Affiliation(s)
- Alexandre Janer
- https://ror.org/01pxwe438 Department of Human Genetics, McGill University, Montreal, Canada
- https://ror.org/01pxwe438 Montreal Neurological Institute, McGill University, Montreal, Canada
| | - Jordan L Morris
- Medical Research Council Mitochondrial Biology Unit, University of Cambridge, Cambridge, UK
| | - Michiel Krols
- https://ror.org/01pxwe438 Montreal Neurological Institute, McGill University, Montreal, Canada
- https://ror.org/01pxwe438 Department of Neurology and Neurosurgery, McGill University, Montreal, Canada
| | - Hana Antonicka
- https://ror.org/01pxwe438 Department of Human Genetics, McGill University, Montreal, Canada
- https://ror.org/01pxwe438 Montreal Neurological Institute, McGill University, Montreal, Canada
| | - Mari J Aaltonen
- https://ror.org/01pxwe438 Department of Human Genetics, McGill University, Montreal, Canada
- https://ror.org/01pxwe438 Montreal Neurological Institute, McGill University, Montreal, Canada
| | - Zhen-Yuan Lin
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada
- Department of Molecular Genetics, University of Toronto, Toronto, Canada
| | - Hanish Anand
- Medical Research Council Mitochondrial Biology Unit, University of Cambridge, Cambridge, UK
| | - Anne-Claude Gingras
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada
- Department of Molecular Genetics, University of Toronto, Toronto, Canada
| | - Julien Prudent
- Medical Research Council Mitochondrial Biology Unit, University of Cambridge, Cambridge, UK
| | - Eric A Shoubridge
- https://ror.org/01pxwe438 Department of Human Genetics, McGill University, Montreal, Canada
- https://ror.org/01pxwe438 Montreal Neurological Institute, McGill University, Montreal, Canada
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9
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Petersen ED, Lapan AP, Castellanos Franco EA, Fillion AJ, Crespo EL, Lambert GG, Grady CJ, Zanca AT, Orcutt R, Hochgeschwender U, Shaner NC, Gilad AA. Bioluminescent Genetically Encoded Glutamate Indicators for Molecular Imaging of Neuronal Activity. ACS Synth Biol 2023; 12:2301-2309. [PMID: 37450884 PMCID: PMC10443529 DOI: 10.1021/acssynbio.2c00687] [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] [Subscribe] [Scholar Register] [Received: 12/24/2022] [Indexed: 07/18/2023]
Abstract
Genetically encoded optical sensors and advancements in microscopy instrumentation and techniques have revolutionized the scientific toolbox available for probing complex biological processes such as release of specific neurotransmitters. Most genetically encoded optical sensors currently used are based on fluorescence and have been highly successful tools for single-cell imaging in superficial brain regions. However, there remains a need to develop new tools for reporting neuronal activity in vivo within deeper structures without the need for hardware such as lenses or fibers to be implanted within the brain. Our approach to this problem is to replace the fluorescent elements of the existing biosensors with bioluminescent elements. This eliminates the need of external light sources to illuminate the sensor, thus allowing deeper brain regions to be imaged noninvasively. Here, we report the development of the first genetically encoded neurotransmitter indicators based on bioluminescent light emission. These probes were optimized by high-throughput screening of linker libraries. The selected probes exhibit robust changes in light output in response to the extracellular presence of the excitatory neurotransmitter glutamate. We expect this new approach to neurotransmitter indicator design to enable the engineering of specific bioluminescent probes for multiple additional neurotransmitters in the future, ultimately allowing neuroscientists to monitor activity associated with a specific neurotransmitter as it relates to behavior in a variety of neuronal and psychiatric disorders, among many other applications.
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Affiliation(s)
- Eric D. Petersen
- Department
of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, United States
- College
of Medicine, Central Michigan University, Mount Pleasant, Michigan 48859, United States
| | - Alexandra P. Lapan
- Department
of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, United States
| | | | - Adam J. Fillion
- Department
of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, United States
| | - Emmanuel L. Crespo
- College
of Medicine, Central Michigan University, Mount Pleasant, Michigan 48859, United States
| | - Gerard G. Lambert
- Department
of Neurosciences, University of California
San Diego School of Medicine, La Jolla, California 92093, United States
| | - Connor J. Grady
- Department
of Biomedical Engineering, Michigan State
University, East Lansing, Michigan 48824, United States
| | - Albertina T. Zanca
- Department
of Neurosciences, University of California
San Diego School of Medicine, La Jolla, California 92093, United States
| | - Richard Orcutt
- Department
of Neurosciences, University of California
San Diego School of Medicine, La Jolla, California 92093, United States
| | - Ute Hochgeschwender
- College
of Medicine, Central Michigan University, Mount Pleasant, Michigan 48859, United States
| | - Nathan C. Shaner
- Department
of Neurosciences, University of California
San Diego School of Medicine, La Jolla, California 92093, United States
| | - Assaf A. Gilad
- Department
of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, United States
- Department
of Radiology, Michigan State University, East Lansing, Michigan 48824, United States
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10
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Weiser A, Hermant A, Bermont F, Sizzano F, Karaz S, Alvarez-Illera P, Santo-Domingo J, Sorrentino V, Feige JN, De Marchi U. The mitochondrial calcium uniporter (MCU) activates mitochondrial respiration and enhances mobility by regulating mitochondrial redox state. Redox Biol 2023; 64:102759. [PMID: 37302345 PMCID: PMC10363449 DOI: 10.1016/j.redox.2023.102759] [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: 04/21/2023] [Revised: 05/14/2023] [Accepted: 05/21/2023] [Indexed: 06/13/2023] Open
Abstract
Regulation of mitochondrial redox balance is emerging as a key event for cell signaling in both physiological and pathological conditions. However, the link between the mitochondrial redox state and the modulation of these conditions remains poorly defined. Here, we discovered that activation of the evolutionary conserved mitochondrial calcium uniporter (MCU) modulates mitochondrial redox state. By using mitochondria-targeted redox and calcium sensors and genetic MCU-ablated models, we provide evidence of the causality between MCU activation and net reduction of mitochondrial (but not cytosolic) redox state. Redox modulation of redox-sensitive groups via MCU stimulation is required for maintaining respiratory capacity in primary human myotubes and C. elegans, and boosts mobility in worms. The same benefits are obtained bypassing MCU via direct pharmacological reduction of mitochondrial proteins. Collectively, our results demonstrate that MCU regulates mitochondria redox balance and that this process is required to promote the MCU-dependent effects on mitochondrial respiration and mobility.
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Affiliation(s)
- Anna Weiser
- Nestlé Institute of Health Sciences, Nestlé Research, EPFL Innovation Park, CH-1015 Lausanne, Switzerland; Molecular Nutritional Medicine, Else Kröner Fresenius Center for Nutritional Medicine, Technische Universität München, 85354 Freising, Germany
| | - Aurélie Hermant
- Nestlé Institute of Health Sciences, Nestlé Research, EPFL Innovation Park, CH-1015 Lausanne, Switzerland
| | - Flavien Bermont
- Nestlé Institute of Health Sciences, Nestlé Research, EPFL Innovation Park, CH-1015 Lausanne, Switzerland
| | - Federico Sizzano
- Nestlé Institute of Health Sciences, Nestlé Research, EPFL Innovation Park, CH-1015 Lausanne, Switzerland
| | - Sonia Karaz
- Nestlé Institute of Health Sciences, Nestlé Research, EPFL Innovation Park, CH-1015 Lausanne, Switzerland
| | - Pilar Alvarez-Illera
- Department of Biochemistry and Molecular Biology, University of Valladolid, Unidad de Excelencia Instituto de Biología y Genética Molecular (IBGM), 47003 Valladolid, Spain
| | - Jaime Santo-Domingo
- Department of Biochemistry and Molecular Biology, University of Valladolid, Unidad de Excelencia Instituto de Biología y Genética Molecular (IBGM), 47003 Valladolid, Spain
| | - Vincenzo Sorrentino
- Nestlé Institute of Health Sciences, Nestlé Research, EPFL Innovation Park, CH-1015 Lausanne, Switzerland; Healthy Longevity Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, 119228, Singapore; Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, 117596, Singapore
| | - Jerome N Feige
- Nestlé Institute of Health Sciences, Nestlé Research, EPFL Innovation Park, CH-1015 Lausanne, Switzerland
| | - Umberto De Marchi
- Nestlé Institute of Health Sciences, Nestlé Research, EPFL Innovation Park, CH-1015 Lausanne, Switzerland.
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11
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Alonso MT, Torres-Vidal P, Calvo B, Rodriguez C, Delrio-Lorenzo A, Rojo-Ruiz J, Garcia-Sancho J, Patel S. Use of aequorin-based indicators for monitoring Ca 2+ in acidic organelles. BIOCHIMICA ET BIOPHYSICA ACTA. MOLECULAR CELL RESEARCH 2023; 1870:119481. [PMID: 37142127 DOI: 10.1016/j.bbamcr.2023.119481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 04/22/2023] [Accepted: 04/26/2023] [Indexed: 05/06/2023]
Abstract
Over the last years, there is accumulating evidence that acidic organelles can accumulate and release Ca2+ upon cell activation. Hence, reliable recording of Ca2+ dynamics in these compartments is essential for understanding the physiopathological aspects of acidic organelles. Genetically encoded Ca2+ indicators (GECIs) are valuable tools to monitor Ca2+ in specific locations, although their use in acidic compartments is challenging due to the pH sensitivity of most available fluorescent GECIs. By contrast, bioluminescent GECIs have a combination of features (marginal pH sensitivity, low background, no phototoxicity, no photobleaching, high dynamic range and tunable affinity) that render them advantageous to achieve an enhanced signal-to-noise ratio in acidic compartments. This article reviews the use of bioluminescent aequorin-based GECIs targeted to acidic compartments. A need for more measurements in highly acidic compartments is identified.
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Affiliation(s)
- M T Alonso
- Unidad de Excelencia, Instituto de Biomedicina y Genética Molecular de Valladolid (IBGM), Universidad de Valladolid y Consejo Superior de Investigaciones Científicas (CSIC), c/ Sanz y Forés 3, 47003 Valladolid, Spain.
| | - P Torres-Vidal
- Unidad de Excelencia, Instituto de Biomedicina y Genética Molecular de Valladolid (IBGM), Universidad de Valladolid y Consejo Superior de Investigaciones Científicas (CSIC), c/ Sanz y Forés 3, 47003 Valladolid, Spain
| | - B Calvo
- Unidad de Excelencia, Instituto de Biomedicina y Genética Molecular de Valladolid (IBGM), Universidad de Valladolid y Consejo Superior de Investigaciones Científicas (CSIC), c/ Sanz y Forés 3, 47003 Valladolid, Spain
| | - C Rodriguez
- Unidad de Excelencia, Instituto de Biomedicina y Genética Molecular de Valladolid (IBGM), Universidad de Valladolid y Consejo Superior de Investigaciones Científicas (CSIC), c/ Sanz y Forés 3, 47003 Valladolid, Spain
| | - A Delrio-Lorenzo
- Universidad Alfonso X el Sabio, Madrid, Avenida Universidad, 1, 28691 Villanueva de la Cañada, Madrid, Spain
| | - J Rojo-Ruiz
- Unidad de Excelencia, Instituto de Biomedicina y Genética Molecular de Valladolid (IBGM), Universidad de Valladolid y Consejo Superior de Investigaciones Científicas (CSIC), c/ Sanz y Forés 3, 47003 Valladolid, Spain
| | - J Garcia-Sancho
- Unidad de Excelencia, Instituto de Biomedicina y Genética Molecular de Valladolid (IBGM), Universidad de Valladolid y Consejo Superior de Investigaciones Científicas (CSIC), c/ Sanz y Forés 3, 47003 Valladolid, Spain
| | - S Patel
- Department of Cell and Developmental Biology, University College London, Gower Street, London WC1E 6BT, UK
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12
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Liang D, Jiang L, Bhat SA, Missiroli S, Perrone M, Lauriola A, Adhikari R, Gudur A, Vasi Z, Ahearn I, Guardavaccaro D, Giorgi C, Philips M, Kuchay S. Palmitoylation and PDE6δ regulate membrane-compartment-specific substrate ubiquitylation and degradation. Cell Rep 2023; 42:111999. [PMID: 36662618 PMCID: PMC9988375 DOI: 10.1016/j.celrep.2023.111999] [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: 11/11/2022] [Accepted: 01/04/2023] [Indexed: 01/20/2023] Open
Abstract
Substrate degradation by the ubiquitin proteasome system (UPS) in specific membrane compartments remains elusive. Here, we show that the interplay of two lipid modifications and PDE6δ regulates compartmental substrate targeting via the SCFFBXL2. FBXL2 is palmitoylated in a prenylation-dependent manner on cysteines 417 and 419 juxtaposed to the CaaX motif. Palmitoylation/depalmitoylation regulates its subcellular trafficking for substrate engagement and degradation. To control its subcellular distribution, lipid-modified FBXL2 interacts with PDE6δ. Perturbing the equilibrium between FBXL2 and PDE6δ disrupts the delivery of FBXL2 to all membrane compartments, whereas depalmitoylated FBXL2 is enriched on the endoplasmic reticulum (ER). Depalmitoylated FBXL2(C417S/C419S) promotes the degradation of IP3R3 at the ER, inhibits IP3R3-dependent mitochondrial calcium overload, and counteracts calcium-dependent cell death upon oxidative stress. In contrast, disrupting the PDE6δ-FBXL2 equilibrium has the opposite effect. These findings describe a mechanism underlying spatially-restricted substrate degradation and suggest that inhibition of FBXL2 palmitoylation and/or binding to PDE6δ may offer therapeutic benefits.
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Affiliation(s)
- David Liang
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, MBRB #1157, Chicago, IL 60607, USA
| | - Liping Jiang
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, MBRB #1157, Chicago, IL 60607, USA
| | - Sameer Ahmed Bhat
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, MBRB #1157, Chicago, IL 60607, USA
| | - Sonia Missiroli
- Department of Medical Sciences, Section of Experimental Medicine, University of Ferrara, 44121 Ferrara, Italy
| | - Mariasole Perrone
- Department of Medical Sciences, Section of Experimental Medicine, University of Ferrara, 44121 Ferrara, Italy
| | - Angela Lauriola
- Department of Biotechnology, University of Verona, 37134 Verona, Italy
| | - Ritika Adhikari
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, MBRB #1157, Chicago, IL 60607, USA
| | - Anish Gudur
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, MBRB #1157, Chicago, IL 60607, USA
| | - Zahra Vasi
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, MBRB #1157, Chicago, IL 60607, USA
| | - Ian Ahearn
- Department of Dermatology and Perlmutter Cancer Center, New York University Grossman School of Medicine, New York, NY 10016, USA
| | | | - Carlotta Giorgi
- Department of Medical Sciences, Section of Experimental Medicine, University of Ferrara, 44121 Ferrara, Italy
| | - Mark Philips
- Department of Medicine and Perlmutter Cancer Center, New York University Grossman School of Medicine, New York, NY 10016, USA
| | - Shafi Kuchay
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, MBRB #1157, Chicago, IL 60607, USA.
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13
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Serrat R, Oliveira-Pinto A, Marsicano G, Pouvreau S. Imaging mitochondrial calcium dynamics in the central nervous system. J Neurosci Methods 2022; 373:109560. [PMID: 35320763 DOI: 10.1016/j.jneumeth.2022.109560] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 03/04/2022] [Accepted: 03/06/2022] [Indexed: 12/28/2022]
Abstract
Mitochondrial calcium handling is a particularly active research area in the neuroscience field, as it plays key roles in the regulation of several functions of the central nervous system, such as synaptic transmission and plasticity, astrocyte calcium signaling, neuronal activity… In the last few decades, a panel of techniques have been developed to measure mitochondrial calcium dynamics, relying mostly on photonic microscopy, and including synthetic sensors, hybrid sensors and genetically encoded calcium sensors. The goal of this review is to endow the reader with a deep knowledge of the historical and latest tools to monitor mitochondrial calcium events in the brain, as well as a comprehensive overview of the current state of the art in brain mitochondrial calcium signaling. We will discuss the main calcium probes used in the field, their mitochondrial targeting strategies, their key properties and major drawbacks. In addition, we will detail the main roles of mitochondrial calcium handling in neuronal tissues through an extended report of the recent studies using mitochondrial targeted calcium sensors in neuronal and astroglial cells, in vitro and in vivo.
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Affiliation(s)
- Roman Serrat
- Institut National de la Santé et de la Recherche Médicale (INSERM), U1215 NeuroCentre Magendie, France; University of Bordeaux, Bordeaux 33077, France
| | - Alexandre Oliveira-Pinto
- Institut National de la Santé et de la Recherche Médicale (INSERM), U1215 NeuroCentre Magendie, France; University of Bordeaux, Bordeaux 33077, France
| | - Giovanni Marsicano
- Institut National de la Santé et de la Recherche Médicale (INSERM), U1215 NeuroCentre Magendie, France; University of Bordeaux, Bordeaux 33077, France
| | - Sandrine Pouvreau
- Institut National de la Santé et de la Recherche Médicale (INSERM), U1215 NeuroCentre Magendie, France; University of Bordeaux, Bordeaux 33077, France.
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14
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Mihajlovic M, Vinken M. Mitochondria as the Target of Hepatotoxicity and Drug-Induced Liver Injury: Molecular Mechanisms and Detection Methods. Int J Mol Sci 2022; 23:ijms23063315. [PMID: 35328737 PMCID: PMC8951158 DOI: 10.3390/ijms23063315] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 03/16/2022] [Accepted: 03/17/2022] [Indexed: 12/12/2022] Open
Abstract
One of the major mechanisms of drug-induced liver injury includes mitochondrial perturbation and dysfunction. This is not a surprise, given that mitochondria are essential organelles in most cells, which are responsible for energy homeostasis and the regulation of cellular metabolism. Drug-induced mitochondrial dysfunction can be influenced by various factors and conditions, such as genetic predisposition, the presence of metabolic disorders and obesity, viral infections, as well as drugs. Despite the fact that many methods have been developed for studying mitochondrial function, there is still a need for advanced and integrative models and approaches more closely resembling liver physiology, which would take into account predisposing factors. This could reduce the costs of drug development by the early prediction of potential mitochondrial toxicity during pre-clinical tests and, especially, prevent serious complications observed in clinical settings.
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15
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De La Rossa A, Laporte MH, Astori S, Marissal T, Montessuit S, Sheshadri P, Ramos-Fernández E, Mendez P, Khani A, Quairiaux C, Taylor EB, Rutter J, Nunes JM, Carleton A, Duchen MR, Sandi C, Martinou JC. Paradoxical neuronal hyperexcitability in a mouse model of mitochondrial pyruvate import deficiency. eLife 2022; 11:72595. [PMID: 35188099 PMCID: PMC8860443 DOI: 10.7554/elife.72595] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 01/21/2022] [Indexed: 11/22/2022] Open
Abstract
Neuronal excitation imposes a high demand of ATP in neurons. Most of the ATP derives primarily from pyruvate-mediated oxidative phosphorylation, a process that relies on import of pyruvate into mitochondria occuring exclusively via the mitochondrial pyruvate carrier (MPC). To investigate whether deficient oxidative phosphorylation impacts neuron excitability, we generated a mouse strain carrying a conditional deletion of MPC1, an essential subunit of the MPC, specifically in adult glutamatergic neurons. We found that, despite decreased levels of oxidative phosphorylation and decreased mitochondrial membrane potential in these excitatory neurons, mice were normal at rest. Surprisingly, in response to mild inhibition of GABA mediated synaptic activity, they rapidly developed severe seizures and died, whereas under similar conditions the behavior of control mice remained unchanged. We report that neurons with a deficient MPC were intrinsically hyperexcitable as a consequence of impaired calcium homeostasis, which reduced M-type potassium channel activity. Provision of ketone bodies restored energy status, calcium homeostasis and M-channel activity and attenuated seizures in animals fed a ketogenic diet. Our results provide an explanation for the seizures that frequently accompany a large number of neuropathologies, including cerebral ischemia and diverse mitochondriopathies, in which neurons experience an energy deficit.
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Affiliation(s)
| | | | - Simone Astori
- Laboratory of Behavioral Genetics, Ecole Polytechnique Fédérale de Lausanne
| | - Thomas Marissal
- Institut de Neurobiologie de la Méditerranée (INMED), Université d'Aix- Marseille
- Department of Basic Neuroscience, University of Geneva
| | | | - Preethi Sheshadri
- Department of Cell and Developmental Biology, University College London
| | | | | | - Abbas Khani
- Department of Basic Neuroscience, University of Geneva
| | | | - Eric B Taylor
- Department of Biochemistry and Fraternal Order of Eagles Diabetes Research Center, Carver College of Medicine, University of Iowa
| | - Jared Rutter
- Howard Hughes Medical Institute and Department of Biochemistry, University of Utah School of Medicine
| | | | - Alan Carleton
- Department of Basic Neuroscience, University of Geneva
| | - Michael R Duchen
- Department of Cell and Developmental Biology, University College London
| | - Carmen Sandi
- Laboratory of Behavioral Genetics, Ecole Polytechnique Fédérale de Lausanne
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16
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Crouzier L, Danese A, Yasui Y, Richard EM, Liévens JC, Patergnani S, Couly S, Diez C, Denus M, Cubedo N, Rossel M, Thiry M, Su TP, Pinton P, Maurice T, Delprat B. Activation of the sigma-1 receptor chaperone alleviates symptoms of Wolfram syndrome in preclinical models. Sci Transl Med 2022; 14:eabh3763. [PMID: 35138910 PMCID: PMC9516885 DOI: 10.1126/scitranslmed.abh3763] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The Wolfram syndrome is a rare autosomal recessive disease affecting many organs with life-threatening consequences; currently, no treatment is available. The disease is caused by mutations in the WSF1 gene, coding for the protein wolframin, an endoplasmic reticulum (ER) transmembrane protein involved in contacts between ER and mitochondria termed as mitochondria-associated ER membranes (MAMs). Inherited mutations usually reduce the protein's stability, altering its homeostasis and ultimately reducing ER to mitochondria calcium ion transfer, leading to mitochondrial dysfunction and cell death. In this study, we found that activation of the sigma-1 receptor (S1R), an ER-resident protein involved in calcium ion transfer, could counteract the functional alterations of MAMs due to wolframin deficiency. The S1R agonist PRE-084 restored calcium ion transfer and mitochondrial respiration in vitro, corrected the associated increased autophagy and mitophagy, and was able to alleviate the behavioral symptoms observed in zebrafish and mouse models of the disease. Our findings provide a potential therapeutic strategy for treating Wolfram syndrome by efficiently boosting MAM function using the ligand-operated S1R chaperone. Moreover, such strategy might also be relevant for other degenerative and mitochondrial diseases involving MAM dysfunction.
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Affiliation(s)
- Lucie Crouzier
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
| | - Alberto Danese
- Department of Medical Sciences, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy
| | - Yuko Yasui
- Cellular Pathobiology Section, Integrative Neuroscience Research Branch, Intramural Research Program, National Institute on Drug Abuse, NIH, 333 Cassell Drive, Baltimore, MD 21224, USA
| | | | | | - Simone Patergnani
- Department of Medical Sciences, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy
| | - Simon Couly
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
- Cellular Pathobiology Section, Integrative Neuroscience Research Branch, Intramural Research Program, National Institute on Drug Abuse, NIH, 333 Cassell Drive, Baltimore, MD 21224, USA
| | - Camille Diez
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
| | - Morgane Denus
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
| | - Nicolas Cubedo
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
| | | | - Marc Thiry
- Laboratoire de Biologie Cellulaire, Université de Liège, GIGA-Neurosciences, Quartier Hopital, Avenue Hippocrate 15, 4000 Liege 1, Belgium
| | - Tsung-Ping Su
- Cellular Pathobiology Section, Integrative Neuroscience Research Branch, Intramural Research Program, National Institute on Drug Abuse, NIH, 333 Cassell Drive, Baltimore, MD 21224, USA
| | - Paolo Pinton
- Department of Medical Sciences, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy
| | - Tangui Maurice
- MMDN, Univ Montpellier, EPHE, INSERM, Montpellier, France
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17
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Bonora M, Kahsay A, Pinton P. Mitochondrial calcium homeostasis in hematopoietic stem cell: Molecular regulation of quiescence, function, and differentiation. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2022; 362:111-140. [PMID: 34253293 DOI: 10.1016/bs.ircmb.2021.05.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
Hematopoiesis is based on the existence of hematopoietic stem cells (HSC) with the capacity to self-proliferate and self-renew or to differentiate into specialized cells. The hematopoietic niche is the essential microenvironment where stem cells reside and integrate various stimuli to determine their fate. Recent studies have identified niche containing high level of calcium (Ca2+) suggesting that HSCs are sensitive to Ca2+. This is a highly versatile and ubiquitous second messenger that regulates a wide variety of cellular functions. Advanced methods for measuring its concentrations, genetic experiments, cell fate tracing data, single-cell imaging, and transcriptomics studies provide information into its specific roles to integrate signaling into an array of mechanisms that determine HSC identity, lineage potential, maintenance, and self-renewal. Accumulating and contrasting evidence, are revealing Ca2+ as a previously unacknowledged feature of HSC, involved in functional maintenance, by regulating multiple actors including transcription and epigenetic factors, Ca2+-dependent kinases and mitochondrial physiology. Mitochondria are significant participants in HSC functions and their responsiveness to cellular demands is controlled to a significant extent via Ca2+ signals. Recent reports indicate that mitochondrial Ca2+ uptake also controls HSC fate. These observations reveal a physiological feature of hematopoietic stem cells that can be harnessed to improve HSC-related disease. In this review, we discuss the current knowledge Ca2+ in hematopoietic stem cell focusing on its potential involvement in proliferation, self-renewal and maintenance of HSC and discuss future research directions.
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Affiliation(s)
- Massimo Bonora
- Department of Medical Sciences, Section of Experimental Medicine, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy.
| | - Asrat Kahsay
- Department of Medical Sciences, Section of Experimental Medicine, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - Paolo Pinton
- Department of Medical Sciences, Section of Experimental Medicine, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy.
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18
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Seipin localizes at endoplasmic-reticulum-mitochondria contact sites to control mitochondrial calcium import and metabolism in adipocytes. Cell Rep 2022; 38:110213. [PMID: 35021082 DOI: 10.1016/j.celrep.2021.110213] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 10/11/2021] [Accepted: 12/14/2021] [Indexed: 12/31/2022] Open
Abstract
Deficiency of the endoplasmic reticulum (ER) protein seipin results in generalized lipodystrophy by incompletely understood mechanisms. Here, we report mitochondrial abnormalities in seipin-deficient patient cells. A subset of seipin is enriched at ER-mitochondria contact sites (MAMs) in human and mouse cells and localizes in the vicinity of calcium regulators SERCA2, IP3R, and VDAC. Seipin association with MAM calcium regulators is stimulated by fasting-like stimuli, while seipin association with lipid droplets is promoted by lipid loading. Acute seipin removal does not alter ER calcium stores but leads to defective mitochondrial calcium import accompanied by a widespread reduction in Krebs cycle metabolites and ATP levels. In mice, inducible seipin deletion leads to mitochondrial dysfunctions preceding the development of metabolic complications. Together, these data suggest that seipin controls mitochondrial energy metabolism by regulating mitochondrial calcium influx at MAMs. In seipin-deficient adipose tissue, reduced ATP production compromises adipocyte properties, contributing to lipodystrophy pathogenesis.
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19
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Vicente M, Salgado-Almario J, Martínez-Sielva A, Llopis J, Domingo B. Optimized Aequorin Reconstitution Protocol to Visualize Calcium Ion Transients in the Heart of Transgenic Zebrafish Embryos In Vivo. Methods Mol Biol 2022; 2524:271-280. [PMID: 35821478 DOI: 10.1007/978-1-0716-2453-1_20] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
We introduce how to image calcium ion levels in the heart of zebrafish embryos and larvae up to 5 days post-fertilization with the photoprotein green fluorescent protein (GFP)-aequorin (GA) in the transgenic line Tg(myl7:GA). Incubation of the embryos with CTZ to obtain the functional photoprotein yields few emission counts, suggesting that, when the heart is beating, the rate of aequorin consumption is faster than that of the reconstitution with CTZ. In this chapter, we present an improved aequorin reconstitution protocol. We further describe the experimental procedure as well as the bioluminescence data analysis and processing.
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Affiliation(s)
- Manuel Vicente
- Physiology and Cell Dynamics Group, Centro Regional de Investigaciones Biomédicas (CRIB) and Facultad de Medicina de Albacete, Universidad de Castilla-La Mancha, Albacete, Spain
| | - Jussep Salgado-Almario
- Physiology and Cell Dynamics Group, Centro Regional de Investigaciones Biomédicas (CRIB) and Facultad de Medicina de Albacete, Universidad de Castilla-La Mancha, Albacete, Spain
| | - Antonio Martínez-Sielva
- Physiology and Cell Dynamics Group, Centro Regional de Investigaciones Biomédicas (CRIB) and Facultad de Medicina de Albacete, Universidad de Castilla-La Mancha, Albacete, Spain
| | - Juan Llopis
- Physiology and Cell Dynamics Group, Centro Regional de Investigaciones Biomédicas (CRIB) and Facultad de Medicina de Albacete, Universidad de Castilla-La Mancha, Albacete, Spain
| | - Beatriz Domingo
- Physiology and Cell Dynamics Group, Centro Regional de Investigaciones Biomédicas (CRIB) and Facultad de Medicina de Albacete, Universidad de Castilla-La Mancha, Albacete, Spain.
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20
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Ramaccini D, Giorgi C, Matter ML. Measuring Mitochondrial Calcium Fluxes in Cardiomyocytes upon Mechanical Stretch-Induced Hypertrophy. Methods Mol Biol 2022; 2475:215-222. [PMID: 35451760 DOI: 10.1007/978-1-0716-2217-9_15] [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] [Indexed: 06/14/2023]
Abstract
Calcium Ca2+ regulation is a key component of numerous cellular functions. In cardiomyocytes, Ca2+ regulates excitation-contraction coupling and influences signaling cascades involved in cell metabolism and cell survival. Prolonged dysregulation of mitochondrial Ca2+ leads to dysfunctional cardiomyocytes, apoptosis and ultimately heart failure. VEGF promotes cardiomyocyte contractility by increasing calcium transients to control the strength of the heartbeat. Here, we describe a method to measure mitochondrial Ca2+ fluxes in human ventricular cardiomocytes after inducing stretch-mediated hypertrophy in vitro.
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Affiliation(s)
- Daniela Ramaccini
- University of Hawaii Cancer Center, Honolulu, HI, USA
- Center for Cardiovascular Research John A. Burns School of Medicine, Honolulu, HI, USA
- Department of Medical Sciences, University of Ferrara, Ferrara, Italy
- Laboratory of Technologies for Advanced Therapy (LTTA), Technopole of Ferrara, Ferrara, Italy
| | - Carlotta Giorgi
- Department of Medical Sciences, University of Ferrara, Ferrara, Italy
- Laboratory of Technologies for Advanced Therapy (LTTA), Technopole of Ferrara, Ferrara, Italy
| | - Michelle L Matter
- University of Hawaii Cancer Center, Honolulu, HI, USA.
- Center for Cardiovascular Research John A. Burns School of Medicine, Honolulu, HI, USA.
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21
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Malikova NP, Eremeeva EV, Gulnov DV, Natashin PV, Nemtseva EV, Vysotski ES. Specific Activities of Hydromedusan Ca 2+ -Regulated Photoproteins. Photochem Photobiol 2021; 98:275-283. [PMID: 34727376 DOI: 10.1111/php.13556] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2021] [Accepted: 11/01/2021] [Indexed: 12/18/2022]
Abstract
Nowadays the recombinant Ca2+ -regulated photoproteins originating from marine luminous organisms are widely applied to monitor calcium transients in living cells due to their ability to emit light on Ca2+ binding. Here we report the specific activities of the recombinant Ca2+ -regulated photoproteins-aequorin from Aequorea victoria, obelins from Obelia longissima and Obelia geniculata, clytin from Clytia gregaria and mitrocomin from Mitrocoma cellularia. We demonstrate that along with bioluminescence spectra, kinetics of light signals and sensitivities to calcium, these photoproteins also differ in specific activities and consequently in quantum yields of bioluminescent reactions. The highest specific activities were found for obelins and mitrocomin, whereas those of aequorin and clytin were shown to be lower. To determine the factors influencing the variations in specific activities the fluorescence quantum yields for Ca2+ -discharged photoproteins were measured and found to be quite different varying in the range of 0.16-0.36. We propose that distinctions in specific activities may result from different efficiencies of singlet excited state generation and different fluorescence quantum yields of coelenteramide bound within substrate-binding cavity. This in turn may be conditioned by variations in the amino acid environment of the substrate-binding cavities and hydrogen bond distances between key residues and atoms of 2-hydroperoxycoelenterazine.
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Affiliation(s)
- Natalia P Malikova
- Photobiology Laboratory, Institute of Biophysics SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", Krasnoyarsk, Russia
| | - Elena V Eremeeva
- Photobiology Laboratory, Institute of Biophysics SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", Krasnoyarsk, Russia.,Institute of Fundamental Biology and Biotechnology, Siberian Federal University, Krasnoyarsk, Russia
| | - Dmitry V Gulnov
- Institute of Fundamental Biology and Biotechnology, Siberian Federal University, Krasnoyarsk, Russia
| | - Pavel V Natashin
- Photobiology Laboratory, Institute of Biophysics SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", Krasnoyarsk, Russia
| | - Elena V Nemtseva
- Photobiology Laboratory, Institute of Biophysics SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", Krasnoyarsk, Russia.,Institute of Fundamental Biology and Biotechnology, Siberian Federal University, Krasnoyarsk, Russia
| | - Eugene S Vysotski
- Photobiology Laboratory, Institute of Biophysics SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", Krasnoyarsk, Russia
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22
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Fellman V, Banerjee R, Lin KL, Pulli I, Cooper H, Tyynismaa H, Kallijärvi J. Severe neonatal MEGDHEL syndrome with a homozygous truncating mutation in SERAC1. Biochim Biophys Acta Mol Basis Dis 2021; 1868:166298. [PMID: 34751152 DOI: 10.1016/j.bbadis.2021.166298] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 10/08/2021] [Accepted: 10/25/2021] [Indexed: 01/10/2023]
Abstract
In the diagnostic work-up of a newborn infant with a metabolic crisis, lethal multiorgan failure on day six of life, and increased excretion of 3-methylglutaconic acid, we found using whole genome sequencing a homozygous SERAC1 mutation indicating MEGDHEL syndrome (3-methylglutaconic aciduria with deafness-dystonia, hepatopathy, encephalopathy, and Leigh-like syndrome). The SERAC1 protein is located at the contact site between mitochondria and the endoplasmic reticulum (ER) and is crucial for cholesterol trafficking. Our aim was to investigate the effect of the homozygous truncating mutation on mitochondrial structure and function. In the patient fibroblasts, no SERAC1 protein was detected, the mitochondrial network was severely fragmented, and the cristae morphology was altered. Filipin staining showed uneven localization of unesterified cholesterol. The calcium buffer function between cytoplasm and mitochondria was deficient. In liver mitochondria, complexes I, III, and IV were clearly decreased. In transfected COS-1 cells the mutant protein with the a 45-amino acid C-terminal truncation was distributed throughout the cell, whereas wild-type SERAC1 partially colocalized with the mitochondrial marker MT-CO1. The structural and functional mitochondrial abnormalities, caused by the loss of SERAC1, suggest that the crucial disease mechanism is disrupted interplay between the ER and mitochondria leading to decreased influx of calcium to mitochondria and secondary respiratory chain deficiency.
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Affiliation(s)
- Vineta Fellman
- Folkhälsan Research Center, Helsinki, Finland; Stem Cells and Metabolism Research Program, Faculty of Medicine, University of Helsinki, Finland; Department of Clinical Sciences, Lund, Pediatrics, Lund University, Sweden; Children's Hospital, University of Helsinki, Finland.
| | - Rishi Banerjee
- Folkhälsan Research Center, Helsinki, Finland; Stem Cells and Metabolism Research Program, Faculty of Medicine, University of Helsinki, Finland
| | - Kai-Lan Lin
- Åbo Akademi University, Faculty of Natural Sciences and Technology, Turku, Finland
| | - Ilari Pulli
- Åbo Akademi University, Faculty of Natural Sciences and Technology, Turku, Finland
| | - Helen Cooper
- Åbo Akademi University, Faculty of Natural Sciences and Technology, Turku, Finland
| | - Henna Tyynismaa
- Stem Cells and Metabolism Research Program, Faculty of Medicine, University of Helsinki, Finland; Neuroscience Center, Helsinki Institute of Life Science, University of Helsinki, Helsinki, Finland
| | - Jukka Kallijärvi
- Folkhälsan Research Center, Helsinki, Finland; Stem Cells and Metabolism Research Program, Faculty of Medicine, University of Helsinki, Finland
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23
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Coordinated glucose-induced Ca 2+ and pH responses in yeast Saccharomyces cerevisiae. Cell Calcium 2021; 100:102479. [PMID: 34610487 DOI: 10.1016/j.ceca.2021.102479] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 09/23/2021] [Accepted: 09/24/2021] [Indexed: 12/13/2022]
Abstract
Ca2+ and pH homeostasis are closely intertwined and this interrelationship is crucial in the cells' ability to adapt to varying environmental conditions. To further understand this Ca2+-pH link, cytosolic Ca2+ was monitored using the aequorin-based bioluminescent assay in parallel with fluorescence reporter-based assays to monitor plasma membrane potentials and intracellular (cytosolic and vacuolar) pH in yeast Saccharomyces cerevisiae. At external pH 5, starved yeast cells displayed depolarized membrane potentials and responded to glucose re-addition with small Ca2+ transients accompanied by cytosolic alkalinization and profound vacuolar acidification. In contrast, starved cells at external pH 7 were hyperpolarized and glucose re-addition induced large Ca2+ transients and vacuolar alkalinization. In external Ca2+-free medium, glucose-induced pH responses were not affected but Ca2+ transients were abolished, indicating that the intracellular [Ca2+] increase was not prerequisite for activation of the two primary proton pumps, being Pma1 at the plasma membrane and the vacuolar and Golgi localized V-ATPases. A reduction in Pma1 expression resulted in membrane depolarization and reduced Ca2+ transients, indicating that the membrane hyperpolarization generated by Pma1 activation governed the Ca2+ influx that is associated with glucose-induced Ca2+ transients. Loss of V-ATPase activity through concanamycin A inhibition did not alter glucose-induced cytosolic pH responses but affected vacuolar pH changes and Ca2+ transients, indicating that the V-ATPase established vacuolar proton gradient is substantial for organelle H+/Ca2+ exchange. Finally, a systematic analysis of yeast deletion strains allowed us to reveal an essential role for both the vacuolar H+/Ca2+ exchanger Vcx1 and the Golgi exchanger Gdt1 in the dissipation of intracellular Ca2+.
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24
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Calcium levels in the Golgi complex regulate clustering and apical sorting of GPI-APs in polarized epithelial cells. Proc Natl Acad Sci U S A 2021; 118:2014709118. [PMID: 34389665 DOI: 10.1073/pnas.2014709118] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Glycosylphosphatidylinositol-anchored proteins (GPI-APs) are lipid-associated luminal secretory cargoes selectively sorted to the apical surface of the epithelia where they reside and play diverse vital functions. Cholesterol-dependent clustering of GPI-APs in the Golgi is the key step driving their apical sorting and their further plasma membrane organization and activity; however, the specific machinery involved in this Golgi event is still poorly understood. In this study, we show that the formation of GPI-AP homoclusters (made of single GPI-AP species) in the Golgi relies directly on the levels of calcium within cisternae. We further demonstrate that the TGN calcium/manganese pump, SPCA1, which regulates the calcium concentration within the Golgi, and Cab45, a calcium-binding luminal Golgi resident protein, are essential for the formation of GPI-AP homoclusters in the Golgi and for their subsequent apical sorting. Down-regulation of SPCA1 or Cab45 in polarized epithelial cells impairs the oligomerization of GPI-APs in the Golgi complex and leads to their missorting to the basolateral surface. Overall, our data reveal an unexpected role for calcium in the mechanism of GPI-AP apical sorting in polarized epithelial cells and identify the molecular machinery involved in the clustering of GPI-APs in the Golgi.
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25
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Fiorito V, Allocco AL, Petrillo S, Gazzano E, Torretta S, Marchi S, Destefanis F, Pacelli C, Audrito V, Provero P, Medico E, Chiabrando D, Porporato PE, Cancelliere C, Bardelli A, Trusolino L, Capitanio N, Deaglio S, Altruda F, Pinton P, Cardaci S, Riganti C, Tolosano E. The heme synthesis-export system regulates the tricarboxylic acid cycle flux and oxidative phosphorylation. Cell Rep 2021; 35:109252. [PMID: 34133926 DOI: 10.1016/j.celrep.2021.109252] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 12/21/2020] [Accepted: 05/25/2021] [Indexed: 12/14/2022] Open
Abstract
Heme is an iron-containing porphyrin of vital importance for cell energetic metabolism. High rates of heme synthesis are commonly observed in proliferating cells. Moreover, the cell-surface heme exporter feline leukemia virus subgroup C receptor 1a (FLVCR1a) is overexpressed in several tumor types. However, the reasons why heme synthesis and export are enhanced in highly proliferating cells remain unknown. Here, we illustrate a functional axis between heme synthesis and heme export: heme efflux through the plasma membrane sustains heme synthesis, and implementation of the two processes down-modulates the tricarboxylic acid (TCA) cycle flux and oxidative phosphorylation. Conversely, inhibition of heme export reduces heme synthesis and promotes the TCA cycle fueling and flux as well as oxidative phosphorylation. These data indicate that the heme synthesis-export system modulates the TCA cycle and oxidative metabolism and provide a mechanistic basis for the observation that both processes are enhanced in cells with high-energy demand.
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Affiliation(s)
- Veronica Fiorito
- Molecular Biotechnology Center (MBC), Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Anna Lucia Allocco
- Molecular Biotechnology Center (MBC), Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Sara Petrillo
- Molecular Biotechnology Center (MBC), Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Elena Gazzano
- Department of Oncology, University of Torino, Torino, Italy
| | - Simone Torretta
- Division of Genetics and Cell Biology, San Raffaele Scientific Institute, Milano, Italy
| | - Saverio Marchi
- Department of Clinical and Molecular Sciences, Marche Polytechnic University, Ancona, Italy
| | - Francesca Destefanis
- Molecular Biotechnology Center (MBC), Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Consiglia Pacelli
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Valentina Audrito
- Immunogenetics Unit, Department of Medical Sciences, University of Torino, Torino, Italy
| | - Paolo Provero
- Molecular Biotechnology Center (MBC), Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy; Center for Omics Sciences, San Raffaele Scientific Institute IRCSS, Milano, Italy
| | - Enzo Medico
- Department of Oncology, University of Torino, Candiolo, TO, Italy; Candiolo Cancer Institute, FPO-IRCCS, Candiolo, TO, Italy
| | - Deborah Chiabrando
- Molecular Biotechnology Center (MBC), Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Paolo Ettore Porporato
- Molecular Biotechnology Center (MBC), Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | | | - Alberto Bardelli
- Department of Oncology, University of Torino, Candiolo, TO, Italy; Candiolo Cancer Institute, FPO-IRCCS, Candiolo, TO, Italy
| | - Livio Trusolino
- Department of Oncology, University of Torino, Candiolo, TO, Italy; Candiolo Cancer Institute, FPO-IRCCS, Candiolo, TO, Italy
| | - Nazzareno Capitanio
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Silvia Deaglio
- Immunogenetics Unit, Department of Medical Sciences, University of Torino, Torino, Italy
| | - Fiorella Altruda
- Molecular Biotechnology Center (MBC), Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Paolo Pinton
- Department of Medical Sciences and Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - Simone Cardaci
- Division of Genetics and Cell Biology, San Raffaele Scientific Institute, Milano, Italy
| | - Chiara Riganti
- Department of Oncology, University of Torino, Torino, Italy
| | - Emanuela Tolosano
- Molecular Biotechnology Center (MBC), Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy.
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26
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Nair-Gill E, Bonora M, Zhong X, Liu A, Miranda A, Stewart N, Ludwig S, Russell J, Gallagher T, Pinton P, Beutler B. Calcium flux control by Pacs1-Wdr37 promotes lymphocyte quiescence and lymphoproliferative diseases. EMBO J 2021; 40:e104888. [PMID: 33630350 DOI: 10.15252/embj.2020104888] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 01/20/2021] [Accepted: 01/26/2021] [Indexed: 12/30/2022] Open
Abstract
Endoplasmic reticulum (ER) calcium (Ca2+ ) stores are critical to proteostasis, intracellular signaling, and cellular bioenergetics. Through forward genetic screening in mice, we identified two members of a new complex, Pacs1 and Wdr37, which are required for normal ER Ca2+ handling in lymphocytes. Deletion of Pacs1 or Wdr37 caused peripheral lymphopenia that was linked to blunted Ca2+ release from the ER after antigen receptor stimulation. Pacs1-deficient cells showed diminished inositol triphosphate receptor expression together with increased ER and oxidative stress. Mature Pacs1-/- B cells proliferated and died in vivo under lymphocyte replete conditions, indicating spontaneous loss of cellular quiescence. Disruption of Pacs1-Wdr37 did not diminish adaptive immune responses, but potently suppressed lymphoproliferative disease models by forcing loss of quiescence. Thus, Pacs1-Wdr37 plays a critical role in stabilizing lymphocyte populations through ER Ca2+ handling and presents a new target for lymphoproliferative disease therapy.
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Affiliation(s)
- Evan Nair-Gill
- Center for the Genetics of Host Defense, University of Texas Southwestern Medical Center, Dallas, TX, USA.,Division of Rheumatic Diseases, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Massimo Bonora
- Department of Medical Sciences, Section of Experimental Medicine, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - Xue Zhong
- Center for the Genetics of Host Defense, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Aijie Liu
- Center for the Genetics of Host Defense, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Amber Miranda
- Center for the Genetics of Host Defense, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Nathan Stewart
- Center for the Genetics of Host Defense, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Sara Ludwig
- Center for the Genetics of Host Defense, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Jamie Russell
- Center for the Genetics of Host Defense, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Thomas Gallagher
- Center for the Genetics of Host Defense, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Paolo Pinton
- Department of Medical Sciences, Section of Experimental Medicine, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - Bruce Beutler
- Center for the Genetics of Host Defense, University of Texas Southwestern Medical Center, Dallas, TX, USA
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27
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Tomilin FN, Rogova AV, Burakova LP, Tchaikovskaya ON, Avramov PV, Fedorov DG, Vysotski ES. Unusual shift in the visible absorption spectrum of an active ctenophore photoprotein elucidated by time-dependent density functional theory. Photochem Photobiol Sci 2021; 20:10.1007/s43630-021-00039-5. [PMID: 33834429 DOI: 10.1007/s43630-021-00039-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2020] [Accepted: 03/29/2021] [Indexed: 11/28/2022]
Abstract
Active hydromedusan and ctenophore Ca2+-regulated photoproteins form complexes consisting of apoprotein and strongly non-covalently bound 2-hydroperoxycoelenterazine (an oxygenated intermediate of coelenterazine). Whereas the absorption maximum of hydromedusan photoproteins is at 460-470 nm, ctenophore photoproteins absorb at 437 nm. Finding out a physical reason for this blue shift is the main objective of this work, and, to achieve it, the whole structure of the protein-substrate complex was optimized using a linear scaling quantum-mechanical method. Electronic excitations pertinent to the spectra of the 2-hydroperoxy adduct of coelenterazine were simulated with time-dependent density functional theory. The dihedral angle of 60° of the 6-(p-hydroxy)-phenyl group relative to the imidazopyrazinone core of 2-hydroperoxycoelenterazine molecule was found to be the key factor determining the absorption of ctenophore photoproteins at 437 nm. The residues relevant to binding of the substrate and its adopting the particular rotation were also identified.
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Affiliation(s)
- Felix N Tomilin
- Kirensky Institute of Physics SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", Akademgorodok 50/38, Krasnoyarsk, 660036, Russia
- Siberian Federal University, Svobodny 79 pr., Krasnoyarsk, 660041, Russia
- National Research Tomsk State University, Lenin Avenue 36, Tomsk, 634050, Russia
| | - Anastasia V Rogova
- Siberian Federal University, Svobodny 79 pr., Krasnoyarsk, 660041, Russia
| | - Ludmila P Burakova
- Siberian Federal University, Svobodny 79 pr., Krasnoyarsk, 660041, Russia
- Photobiology Laboratory, Institute of Biophysics SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", Akademgorodok 50/50, Krasnoyarsk, 660036, Russia
| | - Olga N Tchaikovskaya
- National Research Tomsk State University, Lenin Avenue 36, Tomsk, 634050, Russia
| | - Pavel V Avramov
- Kyungpook National University, 80 Daehakro, Bukgu, Daegu, 41566, South Korea
| | - Dmitri G Fedorov
- Research Center for Computational Design of Advanced Functional Materials (CD-FMat), National Institute of Advanced Industrial Science and Technology (AIST), Central 2, Umezono 1-1-1, Tsukuba, 305-8568, Japan.
| | - Eugene S Vysotski
- Photobiology Laboratory, Institute of Biophysics SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", Akademgorodok 50/50, Krasnoyarsk, 660036, Russia.
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28
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Morciano G, Pedriali G, Bonora M, Pavasini R, Mikus E, Calvi S, Bovolenta M, Lebiedzinska-Arciszewska M, Pinotti M, Albertini A, Wieckowski MR, Giorgi C, Ferrari R, Galluzzi L, Campo G, Pinton P. A naturally occurring mutation in ATP synthase subunit c is associated with increased damage following hypoxia/reoxygenation in STEMI patients. Cell Rep 2021; 35:108983. [PMID: 33852870 DOI: 10.1016/j.celrep.2021.108983] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 02/07/2021] [Accepted: 03/22/2021] [Indexed: 12/19/2022] Open
Abstract
Preclinical models of ischemia/reperfusion injury (RI) demonstrate the deleterious effects of permeability transition pore complex (PTPC) opening in the first minutes upon revascularization of the occluded vessel. The ATP synthase c subunit (Csub) influences PTPC activity in cells, thus impacting tissue injury. A conserved glycine-rich domain in Csub is classified as critical because, when mutated, it modifies ATP synthase properties, protein interaction with the mitochondrial calcium (Ca2+) uniporter complex, and the conductance of the PTPC. Here, we document the role of a naturally occurring mutation in the Csub-encoding ATP5G1 gene at the G87 position found in two ST-segment elevation myocardial infarction (STEMI) patients and how PTPC opening is related to RI in patients affected by the same disease. We report a link between the expression of ATP5G1G87E and the response to hypoxia/reoxygenation of human cardiomyocytes, which worsen when compared to those expressing the wild-type protein, and a positive correlation between PTPC and RI.
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Affiliation(s)
- Giampaolo Morciano
- Maria Cecilia Hospital, GVM Care & Research, 48033 Cotignola, Ravenna, Italy; Department of Medical Sciences, Section of Experimental Medicine, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy
| | - Gaia Pedriali
- Maria Cecilia Hospital, GVM Care & Research, 48033 Cotignola, Ravenna, Italy
| | - Massimo Bonora
- Department of Medical Sciences, Section of Experimental Medicine, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy
| | - Rita Pavasini
- Cardiovascular Institute, Azienda Ospedaliero-Universitaria di Ferrara, Cona, 44121 Ferrara, Italy
| | - Elisa Mikus
- Cardiothoracic and Vascular Department, Maria Cecilia Hospital, GVM Care & Research, 48033 Cotignola, Ravenna, Italy
| | - Simone Calvi
- Cardiothoracic and Vascular Department, Maria Cecilia Hospital, GVM Care & Research, 48033 Cotignola, Ravenna, Italy
| | - Matteo Bovolenta
- Genethon, INSERM UMR951, 1 bis, rue de l'Internationale BP60, 91002 Evry Cedex, France
| | - Magdalena Lebiedzinska-Arciszewska
- Laboratory of Mitochondrial Biology and Metabolism, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
| | - Mirko Pinotti
- Department of Life Sciences and Biotechnology, University of Ferrara, 44121 Ferrara, Italy
| | - Alberto Albertini
- Cardiothoracic and Vascular Department, Maria Cecilia Hospital, GVM Care & Research, 48033 Cotignola, Ravenna, Italy
| | - Mariusz R Wieckowski
- Laboratory of Mitochondrial Biology and Metabolism, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
| | - Carlotta Giorgi
- Department of Medical Sciences, Section of Experimental Medicine, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy
| | - Roberto Ferrari
- Maria Cecilia Hospital, GVM Care & Research, 48033 Cotignola, Ravenna, Italy; Cardiovascular Institute, Azienda Ospedaliero-Universitaria di Ferrara, Cona, 44121 Ferrara, Italy
| | - Lorenzo Galluzzi
- Department of Radiation Oncology, Weill Cornell Medical College, New York, NY, USA; Sandra and Edward Meyer Cancer Center, New York, NY, USA; Caryl and Israel Englander Institute for Precision Medicine, New York, NY, USA; Department of Dermatology, Yale School of Medicine, New Haven, CT, USA; Université de Paris, Paris, France
| | - Gianluca Campo
- Maria Cecilia Hospital, GVM Care & Research, 48033 Cotignola, Ravenna, Italy; Cardiovascular Institute, Azienda Ospedaliero-Universitaria di Ferrara, Cona, 44121 Ferrara, Italy
| | - Paolo Pinton
- Maria Cecilia Hospital, GVM Care & Research, 48033 Cotignola, Ravenna, Italy; Department of Medical Sciences, Section of Experimental Medicine, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, 44121 Ferrara, Italy.
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29
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Calvo-Rodriguez M, Kharitonova EK, Bacskai BJ. In vivo brain imaging of mitochondrial Ca 2+ in neurodegenerative diseases with multiphoton microscopy. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2021; 1868:118998. [PMID: 33684410 DOI: 10.1016/j.bbamcr.2021.118998] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Accepted: 02/22/2021] [Indexed: 10/22/2022]
Abstract
Mitochondria are involved in a large number of essential roles related to neuronal function. Ca2+ handling by mitochondria is critical for many of these functions, including energy production and cellular fate. Conversely, mitochondrial Ca2+ mishandling has been related to a variety of neurodegenerative diseases. Investigating mitochondrial Ca2+ dynamics is essential for advancing our understanding of the role of intracellular mitochondrial Ca2+ signals in physiology and pathology. Improved Ca2+ indicators, and the ability to target them to different cells and compartments, have emerged as useful tools for analysis of Ca2+ signals in living organisms. Combined with state-of-the-art techniques such as multiphoton microscopy, they allow for the study of mitochondrial Ca2+ dynamics in vivo in mouse models of the disease. Here, we provide an overview of the Ca2+ transporters/ion channels in mitochondrial membranes, and the involvement of mitochondrial Ca2+ in neurodegenerative diseases followed by a summary of the main tools available to evaluate mitochondrial Ca2+ dynamics in vivo using the aforementioned technique.
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Affiliation(s)
- Maria Calvo-Rodriguez
- Alzheimer Research Unit, Department of Neurology, Massachusetts General Hospital and Harvard Medical School, 114, 16th St, Charlestown, MA, 02129, USA.
| | - Elizabeth K Kharitonova
- Alzheimer Research Unit, Department of Neurology, Massachusetts General Hospital and Harvard Medical School, 114, 16th St, Charlestown, MA, 02129, USA
| | - Brian J Bacskai
- Alzheimer Research Unit, Department of Neurology, Massachusetts General Hospital and Harvard Medical School, 114, 16th St, Charlestown, MA, 02129, USA
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30
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Mitochondrial Calcium Signaling in Pancreatic β-Cell. Int J Mol Sci 2021; 22:ijms22052515. [PMID: 33802289 PMCID: PMC7959128 DOI: 10.3390/ijms22052515] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 02/22/2021] [Accepted: 02/26/2021] [Indexed: 12/13/2022] Open
Abstract
Accumulation of calcium in energized mitochondria of pancreatic β-cells is emerging as a crucial process for pancreatic β-cell function. β-cell mitochondria sense and shape calcium signals, linking the metabolism of glucose and other secretagogues to the generation of signals that promote insulin secretion during nutrient stimulation. Here, we describe the role of mitochondrial calcium signaling in pancreatic β-cell function. We report the latest pharmacological and genetic findings, including the first mitochondrial calcium-targeted intervention strategies developed to modulate pancreatic β-cell function and their potential relevance in the context of diabetes.
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31
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Li ES, Saha MS. Optimizing Calcium Detection Methods in Animal Systems: A Sandbox for Synthetic Biology. Biomolecules 2021; 11:343. [PMID: 33668387 PMCID: PMC7996158 DOI: 10.3390/biom11030343] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 02/19/2021] [Accepted: 02/21/2021] [Indexed: 12/16/2022] Open
Abstract
Since the 1970s, the emergence and expansion of novel methods for calcium ion (Ca2+) detection have found diverse applications in vitro and in vivo across a series of model animal systems. Matched with advances in fluorescence imaging techniques, the improvements in the functional range and stability of various calcium indicators have significantly enhanced more accurate study of intracellular Ca2+ dynamics and its effects on cell signaling, growth, differentiation, and regulation. Nonetheless, the current limitations broadly presented by organic calcium dyes, genetically encoded calcium indicators, and calcium-responsive nanoparticles suggest a potential path toward more rapid optimization by taking advantage of a synthetic biology approach. This engineering-oriented discipline applies principles of modularity and standardization to redesign and interrogate endogenous biological systems. This review will elucidate how novel synthetic biology technologies constructed for eukaryotic systems can offer a promising toolkit for interfacing with calcium signaling and overcoming barriers in order to accelerate the process of Ca2+ detection optimization.
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Affiliation(s)
| | - Margaret S. Saha
- Department of Biology, College of William and Mary, Williamsburg, VA 23185, USA;
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32
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Saliakoura M, Rossi Sebastiano M, Pozzato C, Heidel FH, Schnöder TM, Savic Prince S, Bubendorf L, Pinton P, A Schmid R, Baumgartner J, Freigang S, Berezowska SA, Rimessi A, Konstantinidou G. PLCγ1 suppression promotes the adaptation of KRAS-mutant lung adenocarcinomas to hypoxia. Nat Cell Biol 2020; 22:1382-1395. [PMID: 33077911 PMCID: PMC7610419 DOI: 10.1038/s41556-020-00592-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Accepted: 09/15/2020] [Indexed: 12/25/2022]
Abstract
Mutant KRAS modulates the metabolic plasticity of cancer cells conferring growth advantage during hypoxia, but the molecular underpinnings are largely unknown. Using a lipidomic screen, we found that PLCγ1 is suppressed during hypoxia in KRAS-mutant human lung adenocarcinoma cancer cell lines. Suppression of PLCγ1 in hypoxia promotes a less oxidative cancer cell metabolism, reduces the formation of mitochondrial reactive oxygen species and switches tumor bioenergetics towards glycolysis by impairing Ca2+ entry into the mitochondria. This event prevents lipid peroxidation, antagonizes apoptosis and increases cancer cell proliferation. Accordingly, loss-of-function of Plcγ1 in a mouse model of KrasG12D-driven lung adenocarcinoma increased the expression of glycolytic genes, boosted tumor growth and reduced survival. In patients with mutant KRAS lung adenocarcinomas, low PLCγ1 expression correlates with increased expression of hypoxia markers and predicts poor patient survival. Thus, our work reveals a mechanism of cancer cell adaptation to hypoxia with potential therapeutic value.
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Affiliation(s)
- Maria Saliakoura
- Institute of Pharmacology, University of Bern, Bern, Switzerland
| | | | - Chiara Pozzato
- Institute of Pharmacology, University of Bern, Bern, Switzerland
| | - Florian H Heidel
- Internal Medicine II, Hematology and Oncology, University Hospital Jena, Jena, Germany.,Leibniz-Institute on Aging, Fritz-Lipmann-Institute, Jena, Jena, Germany
| | - Tina M Schnöder
- Internal Medicine II, Hematology and Oncology, University Hospital Jena, Jena, Germany.,Leibniz-Institute on Aging, Fritz-Lipmann-Institute, Jena, Jena, Germany
| | | | - Lukas Bubendorf
- Institute of Pathology, University Hospital Basel, Basel, Switzerland
| | - Paolo Pinton
- Department of Medical Sciences, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - Ralph A Schmid
- Department of General Thoracic Surgery, Inselspital, Bern, Switzerland
| | | | - Stefan Freigang
- Institute of Pathology, University of Bern, Bern, Switzerland
| | | | - Alessandro Rimessi
- Department of Medical Sciences, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
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33
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Krasitskaya VV, Bashmakova EE, Frank LA. Coelenterazine-Dependent Luciferases as a Powerful Analytical Tool for Research and Biomedical Applications. Int J Mol Sci 2020; 21:E7465. [PMID: 33050422 PMCID: PMC7590018 DOI: 10.3390/ijms21207465] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Revised: 10/05/2020] [Accepted: 10/07/2020] [Indexed: 12/19/2022] Open
Abstract
: The functioning of bioluminescent systems in most of the known marine organisms is based on the oxidation reaction of the same substrate-coelenterazine (CTZ), catalyzed by luciferase. Despite the diversity in structures and the functioning mechanisms, these enzymes can be united into a common group called CTZ-dependent luciferases. Among these, there are two sharply different types of the system organization-Ca2+-regulated photoproteins and luciferases themselves that function in accordance with the classical enzyme-substrate kinetics. Along with deep and comprehensive fundamental research on these systems, approaches and methods of their practical use as highly sensitive reporters in analytics have been developed. The research aiming at the creation of artificial luciferases and synthetic CTZ analogues with new unique properties has led to the development of new experimental analytical methods based on them. The commercial availability of many ready-to-use assay systems based on CTZ-dependent luciferases is also important when choosing them by first-time-users. The development of analytical methods based on these bioluminescent systems is currently booming. The bioluminescent systems under consideration were successfully applied in various biological research areas, which confirms them to be a powerful analytical tool. In this review, we consider the main directions, results, and achievements in research involving these luciferases.
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Affiliation(s)
- Vasilisa V. Krasitskaya
- Institute of Biophysics SB RAS, Federal Research Center “Krasnoyarsk Science Center SB RAS”, 660036 Krasnoyarsk, Russia; (V.V.K.); (E.E.B.)
| | - Eugenia E. Bashmakova
- Institute of Biophysics SB RAS, Federal Research Center “Krasnoyarsk Science Center SB RAS”, 660036 Krasnoyarsk, Russia; (V.V.K.); (E.E.B.)
| | - Ludmila A. Frank
- Institute of Biophysics SB RAS, Federal Research Center “Krasnoyarsk Science Center SB RAS”, 660036 Krasnoyarsk, Russia; (V.V.K.); (E.E.B.)
- School of Fundamental Biology and Biotechnology, Siberian Federal University, 660041 Krasnoyarsk, Russia
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34
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Alexander AJT, Muñoz A, Marcos JF, Read ND. Calcium homeostasis plays important roles in the internalization and activities of the small synthetic antifungal peptide PAF26. Mol Microbiol 2020; 114:521-535. [PMID: 32898933 DOI: 10.1111/mmi.14532] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 05/01/2020] [Accepted: 05/17/2020] [Indexed: 01/22/2023]
Abstract
Fungal diseases are responsible for the deaths of over 1.5 million people worldwide annually. Antifungal peptides represent a useful source of antifungals with novel mechanisms-of-action, and potentially provide new methods of overcoming resistance. Here we investigate the mode-of-action of the small, rationally designed synthetic antifungal peptide PAF26 using the model fungus Neurospora crassa. Here we show that the cell killing activity of PAF26 is dependent on extracellular Ca2+ and the presence of fully functioning fungal Ca2+ homeostatic/signaling machinery. In a screen of mutants with deletions in Ca2+ -signaling machinery, we identified three mutants more tolerant to PAF26. The Ca2+ ATPase NCA-2 was found to be involved in the initial interaction of PAF26 with the cell envelope. The vacuolar Ca2+ channel YVC-1 was shown to be essential for its accumulation and concentration within the vacuolar system. The Ca2+ channel CCH-1 was found to be required to prevent the translocation of PAF26 across the plasma membrane. In the wild type, Ca2+ removal from the medium resulted in the peptide remaining trapped in small vesicles as in the Δyvc-1 mutant. It is, therefore, apparent that cell killing by PAF26 is complex and unusually dependent on extracellular Ca2+ and components of the Ca2+ -regulatory machinery.
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Affiliation(s)
- Akira J T Alexander
- Institute of Infection, Immunity & Inflammation, The University of Glasgow, Glasgow, Scotland
| | - Alberto Muñoz
- MRC Centre for Medical Mycology, University of Exeter, Exeter, UK
| | - Jose F Marcos
- Department of Food Biotechnology, Instituto de Agroquímica y Tecnología de Alimentos (IATA) , Consejo Superior de Investigaciones Científicas (CSIC), Valencia, Spain
| | - Nick D Read
- Manchester Fungal Infection Group, Infection, Immunity & Respiratory Medicine, University of Manchester, Manchester, UK
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35
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Ruffinatti FA, Lomazzi S, Nardo L, Santoro R, Martemiyanov A, Dionisi M, Tapella L, Genazzani AA, Lim D, Distasi C, Caccia M. Assessment of a Silicon-Photomultiplier-Based Platform for the Measurement of Intracellular Calcium Dynamics with Targeted Aequorin. ACS Sens 2020; 5:2388-2397. [PMID: 32701269 PMCID: PMC8009593 DOI: 10.1021/acssensors.0c00277] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
Ca2+ is among the most important intracellular second
messengers participating in a plethora of biological processes, and
the measurement of Ca2+ fluctuations is significant in
the phenomenology of the underlying processes. Aequorin-based Ca2+ probes represent an invaluable tool for reliable measurement
of Ca2+ concentrations and dynamics in different subcellular
compartments. However, their use is limited due to the lack on the
market of ready-to-use, cost-effective, and portable devices for the
detection and readout of the low-intensity bioluminescence signal
produced by these probes. Silicon photomultipliers (SiPMs) are rapidly
evolving solid-state sensors for low light detection, with single
photon sensitivity and photon number resolving capability, featuring
low cost, low voltage, and compact format. Thus, they may represent
the sensors of choice for the development of such devices and, more
in general, of a new generation of multipurpose bioluminescence detectors
suitable for cell biology studies. Ideally, a detector customized
for these purposes must combine high dynamic range with high fidelity
in reconstructing the light intensity signal temporal profile. In
this article, the ability to perform aequorin-based intracellular
Ca2+ measurements using a multipurpose, low-cost setup
exploiting SiPMs as the sensors is demonstrated. SiPMs turn out to
assure performances comparable to those exhibited by a custom-designed
photomultiplier tube-based aequorinometer. Moreover, the flexibility
of SiPM-based devices might pave the way toward routinely and wide
scale application of innovative biophysical protocols.
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Affiliation(s)
| | - Samuela Lomazzi
- Department of Science and High Technology, Università degli Studi dell’Insubria, Via Valleggio 11, Como 22100, Italy
| | - Luca Nardo
- Department of Science and High Technology, Università degli Studi dell’Insubria, Via Valleggio 11, Como 22100, Italy
| | - Romualdo Santoro
- Department of Science and High Technology, Università degli Studi dell’Insubria, Via Valleggio 11, Como 22100, Italy
| | - Alexander Martemiyanov
- Department of Science and High Technology, Università degli Studi dell’Insubria, Via Valleggio 11, Como 22100, Italy
- ITEP, Bol’shaya Cheremushkinskaya Ulitsa, 25, Moscow 117218, Russia
| | - Marianna Dionisi
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Via Bovio 6, Novara 28100, Italy
| | - Laura Tapella
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Via Bovio 6, Novara 28100, Italy
| | - Armando A. Genazzani
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Via Bovio 6, Novara 28100, Italy
| | - Dmitry Lim
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Via Bovio 6, Novara 28100, Italy
| | - Carla Distasi
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Via Bovio 6, Novara 28100, Italy
| | - Massimo Caccia
- Department of Science and High Technology, Università degli Studi dell’Insubria, Via Valleggio 11, Como 22100, Italy
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36
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Wang F, Li A, Meng TG, Wang LY, Wang LJ, Hou Y, Schatten H, Sun QY, Ou XH. Regulation of [Ca 2+] i oscillations and mitochondrial activity by various calcium transporters in mouse oocytes. Reprod Biol Endocrinol 2020; 18:87. [PMID: 32799904 PMCID: PMC7429721 DOI: 10.1186/s12958-020-00643-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 08/10/2020] [Indexed: 12/12/2022] Open
Abstract
Oocyte activation inefficiency is one of the reasons for female infertility and Ca2+ functions play a critical role in the regulation of oocyte activation. We used various inhibitors of Ca2+ channels located on the membrane, including sarcoplasmic/ endoplasmic reticulum Ca2+ATPases (SERCAs, the main Ca2+ pumps which decrease the intracellular Ca2+ level by refilling Ca2+ into the sarcoplasmic reticulum), transient receptor potential (TRP) ion channel subfamily member 7 (TRPM7, a Ca2+/Mg2+-permeable non-selective cation channel), T-type Ca2+ channels and calcium channel Orai1, to investigate their roles in [Ca2+]i oscillation patterns and mitochondrial membrane potential during oocyte activation by real-time recording. Our results showed that SERCAs, TRPM7 and T-type Ca2+ channels were important for initiation and maintenance of [Ca2+]i oscillations, which was required for mitochondrial membrane potential elevation during oocyte activation, as well as oocyte cytoskeleton stability and subsequent embryo development. Increasing the knowledge of calcium transport may provide a theoretical basis for improving oocyte activation in human assisted reproduction clinics.
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Affiliation(s)
- Feng Wang
- Fertility Preservation Lab, Reproductive Medicine Center, Guangdong Second Provincial General Hospital, Guangzhou, 510317 China
- grid.9227.e0000000119573309China State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101 China
| | - Ang Li
- grid.9227.e0000000119573309China State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101 China
| | - Tie-Gang Meng
- Fertility Preservation Lab, Reproductive Medicine Center, Guangdong Second Provincial General Hospital, Guangzhou, 510317 China
- grid.9227.e0000000119573309China State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101 China
| | - Le-Yun Wang
- grid.9227.e0000000119573309China State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101 China
| | - Li-Juan Wang
- grid.9227.e0000000119573309China State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101 China
| | - Yi Hou
- grid.9227.e0000000119573309China State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101 China
| | - Heide Schatten
- grid.134936.a0000 0001 2162 3504Department of Veterinary Pathobiology, University of Missouri, Columbia, MO 65211 USA
| | - Qing-Yuan Sun
- Fertility Preservation Lab, Reproductive Medicine Center, Guangdong Second Provincial General Hospital, Guangzhou, 510317 China
- grid.9227.e0000000119573309China State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101 China
| | - Xiang-Hong Ou
- Fertility Preservation Lab, Reproductive Medicine Center, Guangdong Second Provincial General Hospital, Guangzhou, 510317 China
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37
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Discovery of EMRE in fungi resolves the true evolutionary history of the mitochondrial calcium uniporter. Nat Commun 2020; 11:4031. [PMID: 32788582 PMCID: PMC7423614 DOI: 10.1038/s41467-020-17705-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Accepted: 07/06/2020] [Indexed: 01/25/2023] Open
Abstract
Calcium (Ca2+) influx into mitochondria occurs through a Ca2+-selective uniporter channel, which regulates essential cellular processes in eukaryotic organisms. Previous evolutionary analyses of its pore-forming subunits MCU and EMRE, and gatekeeper MICU1, pinpointed an evolutionary paradox: the presence of MCU homologs in fungal species devoid of any other uniporter components and of mt-Ca2+ uptake. Here, we trace the mt-Ca2+ uniporter evolution across 1,156 fully-sequenced eukaryotes and show that animal and fungal MCUs represent two distinct paralogous subfamilies originating from an ancestral duplication. Accordingly, we find EMRE orthologs outside Holoza and uncover the existence of an animal-like uniporter within chytrid fungi, which enables mt-Ca2+ uptake when reconstituted in vivo in the yeast Saccharomyces cerevisiae. Our study represents the most comprehensive phylogenomic analysis of the mt-Ca2+ uptake system and demonstrates that MCU, EMRE, and MICU formed the core of the ancestral opisthokont uniporter, with major implications for comparative structural and functional studies. The mitochondrial calcium uptake system, crucial for cellular processes, evolved in ancient eukaryotes. Here, authors perform a phylogenomic analysis across 1,156 eukaryotes, and show that previously identified animal and fungal genes in this system originated from an ancestral duplication.
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38
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Patergnani S, Guzzo S, Mangolini A, dell'Atti L, Pinton P, Aguiari G. The induction of AMPK-dependent autophagy leads to P53 degradation and affects cell growth and migration in kidney cancer cells. Exp Cell Res 2020; 395:112190. [PMID: 32717219 DOI: 10.1016/j.yexcr.2020.112190] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 07/10/2020] [Accepted: 07/21/2020] [Indexed: 12/13/2022]
Abstract
The most common subtype of renal cell carcinoma (RCC) is the clear cell RCC (ccRCC) that accounts for 70-80% of cases. The fate of ccRCC is linked to alterations of genes that regulate TP53. The dysfunction of p53 affects several processes including autophagy, which is increased in different advanced carcinomas and could be associated with cancer progression. We report that different kidney cancer cell lines show higher levels of autophagy than control cells. The increased autophagy is associated with the upregulation of miR501-5p, which stimulates mTOR-independent autophagy by the activation of AMP kinase. AMPK activation occurs through the decrease of ATP generation caused by the downregulation of the mitochondrial calcium uniporter (MCU) that leads to the reduction of mitochondrial calcium uptake. Autophagy induction promotes the degradation of p53 through the autophagolysosomal machinery. Consistently, the inhibition of autophagy reduces both cell proliferation and migration enhancing the expression of p53, p21 and E-Cadherin as well as decreasing Vimentin synthesis. Taken together, these findings indicate that autophagy is involved in the progression of kidney cancer. Therefore, the pharmacological targeting of this process could be considered an interesting option for the treatment of advanced renal carcinoma.
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Affiliation(s)
- Simone Patergnani
- Department of Medical Sciences, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, via Fossato di Mortara 70 c.o. viale Eliporto, 44121, Ferrara, Italy
| | - Sonia Guzzo
- Department of Biomedical and Surgical Specialty Sciences, University of Ferrara, via Fossato di Mortara 74, 44121, Ferrara, Italy
| | - Alessandra Mangolini
- Department of Biomedical and Surgical Specialty Sciences, University of Ferrara, via Fossato di Mortara 74, 44121, Ferrara, Italy
| | - Lucio dell'Atti
- Institute of Urology, University Hospital "Ospedali Riuniti", via Conca 71, 60126, Ancona, Italy
| | - Paolo Pinton
- Department of Medical Sciences, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, via Fossato di Mortara 70 c.o. viale Eliporto, 44121, Ferrara, Italy
| | - Gianluca Aguiari
- Department of Biomedical and Surgical Specialty Sciences, University of Ferrara, via Fossato di Mortara 74, 44121, Ferrara, Italy.
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39
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Defective endoplasmic reticulum-mitochondria contacts and bioenergetics in SEPN1-related myopathy. Cell Death Differ 2020; 28:123-138. [PMID: 32661288 PMCID: PMC7853070 DOI: 10.1038/s41418-020-0587-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 06/11/2020] [Accepted: 06/25/2020] [Indexed: 01/19/2023] Open
Abstract
SEPN1-related myopathy (SEPN1-RM) is a muscle disorder due to mutations of the SEPN1 gene, which is characterized by muscle weakness and fatigue leading to scoliosis and life-threatening respiratory failure. Core lesions, focal areas of mitochondria depletion in skeletal muscle fibers, are the most common histopathological lesion. SEPN1-RM underlying mechanisms and the precise role of SEPN1 in muscle remained incompletely understood, hindering the development of biomarkers and therapies for this untreatable disease. To investigate the pathophysiological pathways in SEPN1-RM, we performed metabolic studies, calcium and ATP measurements, super-resolution and electron microscopy on in vivo and in vitro models of SEPN1 deficiency as well as muscle biopsies from SEPN1-RM patients. Mouse models of SEPN1 deficiency showed marked alterations in mitochondrial physiology and energy metabolism, suggesting that SEPN1 controls mitochondrial bioenergetics. Moreover, we found that SEPN1 was enriched at the mitochondria-associated membranes (MAM), and was needed for calcium transients between ER and mitochondria, as well as for the integrity of ER-mitochondria contacts. Consistently, loss of SEPN1 in patients was associated with alterations in body composition which correlated with the severity of muscle weakness, and with impaired ER-mitochondria contacts and low ATP levels. Our results indicate a role of SEPN1 as a novel MAM protein involved in mitochondrial bioenergetics. They also identify a systemic bioenergetic component in SEPN1-RM and establish mitochondria as a novel therapeutic target. This role of SEPN1 contributes to explain the fatigue and core lesions in skeletal muscle as well as the body composition abnormalities identified as part of the SEPN1-RM phenotype. Finally, these results point out to an unrecognized interplay between mitochondrial bioenergetics and ER homeostasis in skeletal muscle. They could therefore pave the way to the identification of biomarkers and therapeutic drugs for SEPN1-RM and for other disorders in which muscle ER-mitochondria cross-talk are impaired.
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40
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Callewaert G, D'hooge P, Ma TY, Del Vecchio M, Van Eyck V, Franssens V, Winderickx J. Decreased Vacuolar Ca 2+ Storage and Disrupted Vesicle Trafficking Underlie Alpha-Synuclein-Induced Ca 2+ Dysregulation in S. cerevisiae. Front Genet 2020; 11:266. [PMID: 32457789 PMCID: PMC7225347 DOI: 10.3389/fgene.2020.00266] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Accepted: 03/05/2020] [Indexed: 11/13/2022] Open
Abstract
The yeast Saccharomyces cerevisiae is a powerful model to study the molecular mechanisms underlying α-synuclein (α-syn) cytotoxicity. This is due to the high degree of conservation of cellular processes with higher eukaryotes and the fact that yeast does not endogenously express α-synuclein. In this work, we focused specifically on the interplay between α-syn and intracellular Ca2+ homeostasis. Using temperature-sensitive SEC4 mutants and deletion strains for the vacuolar Ca2+ transporters Pmc1 and Vcx1, together with aequorin-based Ca2+ recordings, we show that overexpression of α-syn shifts the predominant temporal pattern of organellar Ca2+ release from a biphasic to a quasi-monophasic response. Fragmentation and vesiculation of vacuolar membranes in α-syn expressing cells can account for the faster release of vacuolar Ca2+. α-Syn further significantly reduced Ca2+ storage resulting in increased resting cytosolic Ca2+ levels. Overexpression of the vacuolar Ca2+ ATPase Pmc1 in wild-type cells prevented the α-syn-induced increase in resting Ca2+ and was able to restore growth. We propose that α-syn-induced disruptions in Ca2+ signaling might be an important step in initiating cell death.
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Affiliation(s)
| | | | - Tien-Yang Ma
- The Yeast Hub Lab, KU Leuven, Kortrijk, Belgium.,Functional Biology, Department of Biology, KU Leuven, Heverlee, Belgium
| | - Mara Del Vecchio
- Functional Biology, Department of Biology, KU Leuven, Heverlee, Belgium
| | | | - Vanessa Franssens
- Functional Biology, Department of Biology, KU Leuven, Heverlee, Belgium
| | - Joris Winderickx
- Functional Biology, Department of Biology, KU Leuven, Heverlee, Belgium
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41
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Ding BW, Eremeeva EV, Vysotski ES, Liu YJ. Luminescence Activity Decreases When v-coelenterazine Replaces Coelenterazine in Calcium-Regulated Photoprotein-A Theoretical and Experimental Study. Photochem Photobiol 2020; 96:1047-1060. [PMID: 32416626 DOI: 10.1111/php.13280] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Accepted: 04/23/2020] [Indexed: 11/27/2022]
Abstract
Calcium-regulated photoproteins are found in at least five phyla of organisms. The light emitted by those photoproteins can be tuned by mutating the photoprotein and/or by modifying the substrate coelenterazine (CTZ). Thirty years ago, Shimomura observed that the luminescence activity of aequorin was dramatically reduced when the substrate CTZ was replaced by its analog v-CTZ. The latter is formed by adding a phenyl ring to the π-conjugated moiety of CTZ. The decrease in luminescence activity has not been understood until now. In this paper, through combined quantum mechanics and molecular mechanics calculations as well as molecular dynamics simulations, we discovered the reason for this observation. Modification of the substrate changes the conformation of nearby aromatic residues and enhances the π-π stacking interactions between the conjugated moiety of v-CTZ and the residues, which weakens the charge transfer to form light emitter and leads to a lower luminescence activity. The microenvironments of CTZ in obelin and in aequorin are very similar, so we predicted that the luminescence activity of obelin will also dramatically decrease when CTZ is replaced by v-CTZ. This prediction has received strong evidence from currently theoretical calculations and has been verified by experiments.
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Affiliation(s)
- Bo-Wen Ding
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, China
| | - Elena V Eremeeva
- Photobiology Laboratory, Institute of Biophysics SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", Krasnoyarsk, Russia
| | - Eugene S Vysotski
- Photobiology Laboratory, Institute of Biophysics SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", Krasnoyarsk, Russia
| | - Ya-Jun Liu
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, China
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Plotegher N, Perocheau D, Ferrazza R, Massaro G, Bhosale G, Zambon F, Rahim AA, Guella G, Waddington SN, Szabadkai G, Duchen MR. Impaired cellular bioenergetics caused by GBA1 depletion sensitizes neurons to calcium overload. Cell Death Differ 2020; 27:1588-1603. [PMID: 31685979 PMCID: PMC7206133 DOI: 10.1038/s41418-019-0442-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Revised: 10/09/2019] [Accepted: 10/10/2019] [Indexed: 12/19/2022] Open
Abstract
Heterozygous mutations of the lysosomal enzyme glucocerebrosidase (GBA1) represent the major genetic risk for Parkinson's disease (PD), while homozygous GBA1 mutations cause Gaucher disease, a lysosomal storage disorder, which may involve severe neurodegeneration. We have previously demonstrated impaired autophagy and proteasomal degradation pathways and mitochondrial dysfunction in neurons from GBA1 knockout (gba1-/-) mice. We now show that stimulation with physiological glutamate concentrations causes pathological [Ca2+]c responses and delayed calcium deregulation, collapse of mitochondrial membrane potential and an irreversible fall in the ATP/ADP ratio. Mitochondrial Ca2+ uptake was reduced in gba1-/- cells as was expression of the mitochondrial calcium uniporter. The rate of free radical generation was increased in gba1-/- neurons. Behavior of gba1+/- neurons was similar to gba1-/- in terms of all variables, consistent with a contribution of these mechanisms to the pathogenesis of PD. These data signpost reduced bioenergetic capacity and [Ca2+]c dysregulation as mechanisms driving neurodegeneration.
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Affiliation(s)
- Nicoletta Plotegher
- Cell and Developmental Biology Department, University College London, London, WC1E6XA, UK
- Department of Biology, University of Padua, 35131, Padua, Italy
| | - Dany Perocheau
- Institute for Women's Health, University College London, London, WC1E6HU, UK
| | - Ruggero Ferrazza
- Department of Physics, University of Trento, 38123, Povo (TN), Italy
| | - Giulia Massaro
- School of Pharmacy, University College London, London, WC1N1AX, UK
| | - Gauri Bhosale
- Cell and Developmental Biology Department, University College London, London, WC1E6XA, UK
| | - Federico Zambon
- Cell and Developmental Biology Department, University College London, London, WC1E6XA, UK
| | - Ahad A Rahim
- School of Pharmacy, University College London, London, WC1N1AX, UK
| | - Graziano Guella
- Department of Physics, University of Trento, 38123, Povo (TN), Italy
| | - Simon N Waddington
- Institute for Women's Health, University College London, London, WC1E6HU, UK
- MRC Antiviral Gene Therapy Research Unit, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Gyorgy Szabadkai
- Cell and Developmental Biology Department, University College London, London, WC1E6XA, UK
- Department of Biomedical Sciences, University of Padua, 35131, Padua, Italy
- The Francis Crick Institute, London, NW1 1AT, UK
| | - Michael R Duchen
- Cell and Developmental Biology Department, University College London, London, WC1E6XA, UK.
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Wang Y, Liang G, Liang S, Mund R, Shi Y, Wei H. Dantrolene Ameliorates Impaired Neurogenesis and Synaptogenesis in Induced Pluripotent Stem Cell Lines Derived from Patients with Alzheimer's Disease. Anesthesiology 2020; 132:1062-1079. [PMID: 32149777 PMCID: PMC7160009 DOI: 10.1097/aln.0000000000003224] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
BACKGROUND Overactivation of ryanodine receptors and the resulting impaired calcium homeostasis contribute to Alzheimer's disease-related pathophysiology. This study hypothesized that exposing neuronal progenitors derived from induced pluripotent stems cells of patients with Alzheimer's disease to dantrolene will increase survival, proliferation, neurogenesis, and synaptogenesis. METHODS Induced pluripotent stem cells obtained from skin fibroblast of healthy subjects and patients with familial and sporadic Alzheimer's disease were used. Biochemical and immunohistochemical methods were applied to determine the effects of dantrolene on the viability, proliferation, differentiation, and calcium dynamics of these cells. RESULTS Dantrolene promoted cell viability and proliferation in these two cell lines. Compared with the control, differentiation into basal forebrain cholinergic neurons significantly decreased by 10.7% (32.9 ± 3.6% vs. 22.2 ± 2.6%, N = 5, P = 0.004) and 9.2% (32.9 ± 3.6% vs. 23.7 ± 3.1%, N = 5, P = 0.017) in cell lines from sporadic and familial Alzheimer's patients, respectively, which were abolished by dantrolene. Synapse density was significantly decreased in cortical neurons generated from stem cells of sporadic Alzheimer's disease by 58.2% (237.0 ± 28.4 vs. 99.0 ± 16.6 arbitrary units, N = 4, P = 0.001) or familial Alzheimer's disease by 52.3% (237.0 ± 28.4 vs.113.0 ± 34.9 vs. arbitrary units, N = 5, P = 0.001), which was inhibited by dantrolene in the familial cell line. Compared with the control, adenosine triphosphate (30 µM) significantly increased higher peak elevation of cytosolic calcium concentrations in the cell line from sporadic Alzheimer's patients (84.1 ± 27.0% vs. 140.4 ± 40.2%, N = 5, P = 0.049), which was abolished by the pretreatment of dantrolene. Dantrolene inhibited the decrease of lysosomal vacuolar-type H-ATPase and the impairment of autophagy activity in these two cell lines from Alzheimer's disease patients. CONCLUSIONS Dantrolene ameliorated the impairment of neurogenesis and synaptogenesis, in association with restoring intracellular Ca homeostasis and physiologic autophagy, cell survival, and proliferation in induced pluripotent stem cells and their derived neurons from sporadic and familial Alzheimer's disease patients.
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Affiliation(s)
- Yong Wang
- Department of Anesthesiology and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
- Department of Anesthesiology, the First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510405, China
| | - Ge Liang
- Department of Anesthesiology and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Shuqing Liang
- Department of Anesthesiology and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
- Department of Anesthesiology, the First Affiliated Hospital of Jinan University, Guangzhou, 510632, China
| | - Rachel Mund
- Undergraduate Student, College of Art and Science, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Yun Shi
- Department of Anesthesiology and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
- Department of Anesthesiology, Children’s hospital of Fudan University, Shanghai, 201102, China
| | - Huafeng Wei
- Department of Anesthesiology and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
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Rojas-Charry L, Calero-Martinez S, Morganti C, Morciano G, Park K, Hagel C, Marciniak SJ, Glatzel M, Pinton P, Sepulveda-Falla D. Susceptibility to cellular stress in PS1 mutant N2a cells is associated with mitochondrial defects and altered calcium homeostasis. Sci Rep 2020; 10:6455. [PMID: 32296078 PMCID: PMC7160112 DOI: 10.1038/s41598-020-63254-7] [Citation(s) in RCA: 6] [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: 03/08/2019] [Accepted: 03/27/2020] [Indexed: 12/16/2022] Open
Abstract
Presenilin 1 (PS1) mutations are the most common cause of familial Alzheimer's disease (FAD). PS1 also plays a role in cellular processes such as calcium homeostasis and autophagy. We hypothesized that mutant presenilins increase cellular vulnerability to stress. We stably expressed human PS1, mutant PS1E280A and mutant PS1Δ9 in mouse neuroblastoma N2a cells. We examined early signs of stress in different conditions: endoplasmic reticulum (ER) stress, calcium overload, oxidative stress, and Aβ 1-42 oligomers toxicity. Additionally, we induced autophagy via serum starvation. PS1 mutations did not have an effect in ER stress but PS1E280A mutation affected autophagy. PS1 overexpression influenced calcium homeostasis and generated mitochondrial calcium overload modifying mitochondrial function. However, the opening of the mitochondrial permeability transition pore (MPTP) was affected in PS1 mutants, being accelerated in PS1E280A and inhibited in PS1Δ9 cells. Altered autophagy in PS1E280A cells was neither modified by inhibition of γ-secretase, nor by ER calcium retention. MPTP opening was directly regulated by γ-secretase inhibitors independent on organelle calcium modulation, suggesting a novel direct role for PS1 and γ-secretase in mitochondrial stress. We identified intrinsic cellular vulnerability to stress in PS1 mutants associated simultaneously with both, autophagic and mitochondrial function, independent of Aβ pathology.
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Affiliation(s)
- Liliana Rojas-Charry
- Institute of Neuropathology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Sergio Calero-Martinez
- Institute of Neuropathology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Claudia Morganti
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, University of Ferrara, 44121, Ferrara, Italy
| | - Giampaolo Morciano
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, University of Ferrara, 44121, Ferrara, Italy
| | - Kyungeun Park
- Institute of Neuropathology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Christian Hagel
- Institute of Neuropathology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Stefan J Marciniak
- Cambridge Institute for Medical Research (CIMR), University of Cambridge, Cambridge, UK
| | - Markus Glatzel
- Institute of Neuropathology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Paolo Pinton
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, University of Ferrara, 44121, Ferrara, Italy
| | - Diego Sepulveda-Falla
- Institute of Neuropathology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
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45
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Calcium mishandling in absence of primary mitochondrial dysfunction drives cellular pathology in Wolfram Syndrome. Sci Rep 2020; 10:4785. [PMID: 32179840 PMCID: PMC7075867 DOI: 10.1038/s41598-020-61735-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Accepted: 02/18/2020] [Indexed: 02/06/2023] Open
Abstract
Wolfram syndrome (WS) is a recessive multisystem disorder defined by the association of diabetes mellitus and optic atrophy, reminiscent of mitochondrial diseases. The role played by mitochondria remains elusive, with contradictory results on the occurrence of mitochondrial dysfunction. We evaluated 13 recessive WS patients by deep clinical phenotyping, including optical coherence tomography (OCT), serum lactic acid at rest and after standardized exercise, brain Magnetic Resonance Imaging, and brain and muscle Magnetic Resonance Spectroscopy (MRS). Finally, we investigated mitochondrial bioenergetics, network morphology, and calcium handling in patient-derived fibroblasts. Our results do not support a primary mitochondrial dysfunction in WS patients, as suggested by MRS studies, OCT pattern of retinal nerve fiber layer loss, and, in fibroblasts, by mitochondrial bioenergetics and network morphology results. However, we clearly found calcium mishandling between endoplasmic reticulum (ER) and mitochondria, which, under specific metabolic conditions of increased energy requirements and in selected tissue or cell types, may turn into a secondary mitochondrial dysfunction. Critically, we showed that Wolframin (WFS1) protein is enriched at mitochondrial-associated ER membranes and that in patient-derived fibroblasts WFS1 protein is completely absent. These findings support a loss-of-function pathogenic mechanism for missense mutations in WFS1, ultimately leading to defective calcium influx within mitochondria.
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Targeting Mitochondrial Calcium Uptake with the Natural Flavonol Kaempferol, to Promote Metabolism/Secretion Coupling in Pancreatic β-cells. Nutrients 2020; 12:nu12020538. [PMID: 32093050 PMCID: PMC7071504 DOI: 10.3390/nu12020538] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Accepted: 02/14/2020] [Indexed: 12/26/2022] Open
Abstract
Pancreatic β-cells secrete insulin to lower blood glucose, following a meal. Maintenance of β-cell function is essential to preventing type 2 diabetes. In pancreatic β-cells, mitochondrial matrix calcium is an activating signal for insulin secretion. Recently, the molecular identity of the mitochondrial calcium uniporter (MCU), the transporter that mediates mitochondrial calcium uptake, was revealed. Its role in pancreatic β-cell signal transduction modulation was clarified, opening new perspectives for intervention. Here, we investigated the effects of a mitochondrial Ca2+-targeted nutritional intervention strategy on metabolism/secretion coupling, in a model of pancreatic insulin-secreting cells (INS-1E). Acute treatment of INS-1E cells with the natural plant flavonoid and MCU activator kaempferol, at a low micromolar range, increased mitochondrial calcium rise during glucose stimulation, without affecting the expression level of the MCU and with no cytotoxicity. Enhanced mitochondrial calcium rises potentiated glucose-induced insulin secretion. Conversely, the MCU inhibitor mitoxantrone inhibited mitochondrial Ca2+ uptake and prevented both glucose-induced insulin secretion and kaempferol-potentiated effects. The kaempferol-dependent potentiation of insulin secretion was finally validated in a model of a standardized pancreatic human islet. We conclude that the plant product kaempferol activates metabolism/secretion coupling in insulin-secreting cells by modulating mitochondrial calcium uptake.
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47
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Galla L, Redolfi N, Pozzan T, Pizzo P, Greotti E. Intracellular Calcium Dysregulation by the Alzheimer's Disease-Linked Protein Presenilin 2. Int J Mol Sci 2020; 21:E770. [PMID: 31991578 PMCID: PMC7037278 DOI: 10.3390/ijms21030770] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 01/17/2020] [Accepted: 01/21/2020] [Indexed: 12/18/2022] Open
Abstract
Alzheimer's disease (AD) is the most common form of dementia. Even though most AD cases are sporadic, a small percentage is familial due to autosomal dominant mutations in amyloid precursor protein (APP), presenilin-1 (PSEN1), and presenilin-2 (PSEN2) genes. AD mutations contribute to the generation of toxic amyloid β (Aβ) peptides and the formation of cerebral plaques, leading to the formulation of the amyloid cascade hypothesis for AD pathogenesis. Many drugs have been developed to inhibit this pathway but all these approaches currently failed, raising the need to find additional pathogenic mechanisms. Alterations in cellular calcium (Ca2+) signaling have also been reported as causative of neurodegeneration. Interestingly, Aβ peptides, mutated presenilin-1 (PS1), and presenilin-2 (PS2) variously lead to modifications in Ca2+ homeostasis. In this contribution, we focus on PS2, summarizing how AD-linked PS2 mutants alter multiple Ca2+ pathways and the functional consequences of this Ca2+ dysregulation in AD pathogenesis.
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Affiliation(s)
- Luisa Galla
- Department of Biomedical Sciences, University of Padua, 35131 Padua, Italy; (L.G.); (N.R.); (T.P.); (E.G.)
- Neuroscience Institute, National Research Council (CNR), 35131 Padua, Italy
| | - Nelly Redolfi
- Department of Biomedical Sciences, University of Padua, 35131 Padua, Italy; (L.G.); (N.R.); (T.P.); (E.G.)
| | - Tullio Pozzan
- Department of Biomedical Sciences, University of Padua, 35131 Padua, Italy; (L.G.); (N.R.); (T.P.); (E.G.)
- Neuroscience Institute, National Research Council (CNR), 35131 Padua, Italy
- Venetian Institute of Molecular Medicine (VIMM), 35131 Padua, Italy
| | - Paola Pizzo
- Department of Biomedical Sciences, University of Padua, 35131 Padua, Italy; (L.G.); (N.R.); (T.P.); (E.G.)
- Neuroscience Institute, National Research Council (CNR), 35131 Padua, Italy
| | - Elisa Greotti
- Department of Biomedical Sciences, University of Padua, 35131 Padua, Italy; (L.G.); (N.R.); (T.P.); (E.G.)
- Neuroscience Institute, National Research Council (CNR), 35131 Padua, Italy
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48
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Gökerküçük EB, Tramier M, Bertolin G. Imaging Mitochondrial Functions: from Fluorescent Dyes to Genetically-Encoded Sensors. Genes (Basel) 2020; 11:genes11020125. [PMID: 31979408 PMCID: PMC7073610 DOI: 10.3390/genes11020125] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Revised: 01/20/2020] [Accepted: 01/21/2020] [Indexed: 12/18/2022] Open
Abstract
Mitochondria are multifunctional organelles that are crucial to cell homeostasis. They constitute the major site of energy production for the cell, they are key players in signalling pathways using secondary messengers such as calcium, and they are involved in cell death and redox balance paradigms. Mitochondria quickly adapt their dynamics and biogenesis rates to meet the varying energy demands of the cells, both in normal and in pathological conditions. Therefore, understanding simultaneous changes in mitochondrial functions is crucial in developing mitochondria-based therapy options for complex pathological conditions such as cancer, neurological disorders, and metabolic syndromes. To this end, fluorescence microscopy coupled to live imaging represents a promising strategy to track these changes in real time. In this review, we will first describe the commonly available tools to follow three key mitochondrial functions using fluorescence microscopy: Calcium signalling, mitochondrial dynamics, and mitophagy. Then, we will focus on how the development of genetically-encoded fluorescent sensors became a milestone for the understanding of these mitochondrial functions. In particular, we will show how these tools allowed researchers to address several biochemical activities in living cells, and with high spatiotemporal resolution. With the ultimate goal of tracking multiple mitochondrial functions simultaneously, we will conclude by presenting future perspectives for the development of novel genetically-encoded fluorescent biosensors.
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49
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Wettmarshausen J, Goh V, Huang KT, Arduino DM, Tripathi U, Leimpek A, Cheng Y, Pittis AA, Gabaldón T, Mokranjac D, Hajnóczky G, Perocchi F. MICU1 Confers Protection from MCU-Dependent Manganese Toxicity. Cell Rep 2019; 25:1425-1435.e7. [PMID: 30403999 DOI: 10.1016/j.celrep.2018.10.037] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2018] [Revised: 08/09/2018] [Accepted: 10/08/2018] [Indexed: 12/17/2022] Open
Abstract
The mitochondrial calcium uniporter is a highly selective ion channel composed of species- and tissue-specific subunits. However, the functional role of each component still remains unclear. Here, we establish a synthetic biology approach to dissect the interdependence between the pore-forming subunit MCU and the calcium-sensing regulator MICU1. Correlated evolutionary patterns across 247 eukaryotes indicate that their co-occurrence may have conferred a positive fitness advantage. We find that, while the heterologous reconstitution of MCU and EMRE in vivo in yeast enhances manganese stress, this is prevented by co-expression of MICU1. Accordingly, MICU1 deletion sensitizes human cells to manganese-dependent cell death by disinhibiting MCU-mediated manganese uptake. As a result, manganese overload increases oxidative stress, which can be effectively prevented by NAC treatment. Our study identifies a critical contribution of MICU1 to the uniporter selectivity, with important implications for patients with MICU1 deficiency, as well as neurological disorders arising upon chronic manganese exposure.
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Affiliation(s)
- Jennifer Wettmarshausen
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center (HDC), Helmholtz Zentrum München, 85764 Neuherberg, Germany; Department of Biochemistry, Gene Center Munich, Ludwig-Maximilians Universität München, 81377 Munich, Germany
| | - Valerie Goh
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center (HDC), Helmholtz Zentrum München, 85764 Neuherberg, Germany; Department of Biochemistry, Gene Center Munich, Ludwig-Maximilians Universität München, 81377 Munich, Germany
| | - Kai-Ting Huang
- Department of Pathology, Anatomy, and Cell Biology, MitoCare Center, Thomas Jefferson University, Philadelphia, PA 19107, USA
| | - Daniela M Arduino
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center (HDC), Helmholtz Zentrum München, 85764 Neuherberg, Germany; Department of Biochemistry, Gene Center Munich, Ludwig-Maximilians Universität München, 81377 Munich, Germany
| | - Utkarsh Tripathi
- Department of Biochemistry, Gene Center Munich, Ludwig-Maximilians Universität München, 81377 Munich, Germany
| | - Anja Leimpek
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center (HDC), Helmholtz Zentrum München, 85764 Neuherberg, Germany; Department of Biochemistry, Gene Center Munich, Ludwig-Maximilians Universität München, 81377 Munich, Germany
| | - Yiming Cheng
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center (HDC), Helmholtz Zentrum München, 85764 Neuherberg, Germany; Department of Biochemistry, Gene Center Munich, Ludwig-Maximilians Universität München, 81377 Munich, Germany
| | - Alexandros A Pittis
- Bioinformatics and Genomics Programme, Centre for Genomic Regulation (CRG), 08003 Barcelona, Spain; Departament of Ciències Experimentals I de La Salut, Universitat Pompeu Fabra (UPF), 08003 Barcelona, Spain
| | - Toni Gabaldón
- Bioinformatics and Genomics Programme, Centre for Genomic Regulation (CRG), 08003 Barcelona, Spain; Departament of Ciències Experimentals I de La Salut, Universitat Pompeu Fabra (UPF), 08003 Barcelona, Spain; Institució Catalana de Recerca i Estudis Avançats (ICREA), 08010 Barcelona, Spain
| | - Dejana Mokranjac
- Biomedical Center Munich - Physiological Chemistry, Ludwig-Maximilians Universität München, 82152 Martinsried, Germany
| | - György Hajnóczky
- Department of Pathology, Anatomy, and Cell Biology, MitoCare Center, Thomas Jefferson University, Philadelphia, PA 19107, USA
| | - Fabiana Perocchi
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center (HDC), Helmholtz Zentrum München, 85764 Neuherberg, Germany; Department of Biochemistry, Gene Center Munich, Ludwig-Maximilians Universität München, 81377 Munich, Germany; Munich Cluster for Systems Neurology, 81377 Munich, Germany.
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50
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D'Eletto M, Rossin F, Occhigrossi L, Farrace MG, Faccenda D, Desai R, Marchi S, Refolo G, Falasca L, Antonioli M, Ciccosanti F, Fimia GM, Pinton P, Campanella M, Piacentini M. Transglutaminase Type 2 Regulates ER-Mitochondria Contact Sites by Interacting with GRP75. Cell Rep 2019; 25:3573-3581.e4. [PMID: 30590033 DOI: 10.1016/j.celrep.2018.11.094] [Citation(s) in RCA: 102] [Impact Index Per Article: 20.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 09/20/2018] [Accepted: 11/27/2018] [Indexed: 01/30/2023] Open
Abstract
Transglutaminase type 2 (TG2) is a multifunctional enzyme that plays a key role in mitochondria homeostasis under stressful cellular conditions. TG2 interactome analysis reveals an enzyme interaction with GRP75 (glucose-regulated protein 75). GRP75 localizes in mitochondria-associated membranes (MAMs) and acts as a bridging molecule between the two organelles by assembling the IP3R-GRP75-VDAC complex, which is involved in the transport of Ca2+ from the endoplasmic reticulum (ER) to mitochondria. We demonstrate that the TG2 and GRP75 interaction occurs in MAMs. The absence of the TG2-GRP75 interaction leads to an increase of the interaction between IP3R-3 and GRP75; a decrease of the number of ER-mitochondria contact sites; an impairment of the ER-mitochondrial Ca2+ flux; and an altered profile of the MAM proteome. These findings indicate TG2 is a key regulatory element of the MAMs.
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Affiliation(s)
- Manuela D'Eletto
- Department of Biology, University of Rome "Tor Vergata," Rome 00133, Italy
| | - Federica Rossin
- Department of Biology, University of Rome "Tor Vergata," Rome 00133, Italy
| | - Luca Occhigrossi
- Department of Biology, University of Rome "Tor Vergata," Rome 00133, Italy
| | | | - Danilo Faccenda
- Department of Comparative Biomedical Sciences, The Royal Veterinary College, University of London, Royal College Street, London NW1 0TU, UK
| | - Radha Desai
- Department of Comparative Biomedical Sciences, The Royal Veterinary College, University of London, Royal College Street, London NW1 0TU, UK
| | - Saverio Marchi
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara 44122, Italy
| | - Giulia Refolo
- National Institute for Infectious Diseases IRCCS "L. Spallanzani," Rome 00149, Italy
| | - Laura Falasca
- National Institute for Infectious Diseases IRCCS "L. Spallanzani," Rome 00149, Italy
| | - Manuela Antonioli
- National Institute for Infectious Diseases IRCCS "L. Spallanzani," Rome 00149, Italy
| | - Fabiola Ciccosanti
- National Institute for Infectious Diseases IRCCS "L. Spallanzani," Rome 00149, Italy
| | - Gian Maria Fimia
- National Institute for Infectious Diseases IRCCS "L. Spallanzani," Rome 00149, Italy; Department of Biological and Environmental Sciences and Technologies (DiSTeBA), University of Salento, Lecce 73100, Italy
| | - Paolo Pinton
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara 44122, Italy
| | - Michelangelo Campanella
- Department of Biology, University of Rome "Tor Vergata," Rome 00133, Italy; Department of Comparative Biomedical Sciences, The Royal Veterinary College, University of London, Royal College Street, London NW1 0TU, UK; UCL Consortium for Mitochondrial Research, Gower Street, London WC1E 6BT, UK
| | - Mauro Piacentini
- Department of Biology, University of Rome "Tor Vergata," Rome 00133, Italy; National Institute for Infectious Diseases IRCCS "L. Spallanzani," Rome 00149, Italy.
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