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Lanfranchi M, Yandiev S, Meyer-Dilhet G, Ellouze S, Kerkhofs M, Dos Reis R, Garcia A, Blondet C, Amar A, Kneppers A, Polvèche H, Plassard D, Foretz M, Viollet B, Sakamoto K, Mounier R, Bourgeois CF, Raineteau O, Goillot E, Courchet J. The AMPK-related kinase NUAK1 controls cortical axons branching by locally modulating mitochondrial metabolic functions. Nat Commun 2024; 15:2487. [PMID: 38514619 PMCID: PMC10958033 DOI: 10.1038/s41467-024-46146-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2023] [Accepted: 02/15/2024] [Indexed: 03/23/2024] Open
Abstract
The cellular mechanisms underlying axonal morphogenesis are essential to the formation of functional neuronal networks. We previously identified the autism-linked kinase NUAK1 as a central regulator of axon branching through the control of mitochondria trafficking. However, (1) the relationship between mitochondrial position, function and axon branching and (2) the downstream effectors whereby NUAK1 regulates axon branching remain unknown. Here, we report that mitochondria recruitment to synaptic boutons supports collateral branches stabilization rather than formation in mouse cortical neurons. NUAK1 deficiency significantly impairs mitochondrial metabolism and axonal ATP concentration, and upregulation of mitochondrial function is sufficient to rescue axonal branching in NUAK1 null neurons in vitro and in vivo. Finally, we found that NUAK1 regulates axon branching through the mitochondria-targeted microprotein BRAWNIN. Our results demonstrate that NUAK1 exerts a dual function during axon branching through its ability to control mitochondrial distribution and metabolic activity.
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Affiliation(s)
- Marine Lanfranchi
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Inserm, Physiopathologie et Génétique du Neurone et du Muscle, UMR5261, U1315, Institut NeuroMyoGène, 69008, Lyon, France
| | - Sozerko Yandiev
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Inserm, Physiopathologie et Génétique du Neurone et du Muscle, UMR5261, U1315, Institut NeuroMyoGène, 69008, Lyon, France
| | - Géraldine Meyer-Dilhet
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Inserm, Physiopathologie et Génétique du Neurone et du Muscle, UMR5261, U1315, Institut NeuroMyoGène, 69008, Lyon, France
| | - Salma Ellouze
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Inserm, Physiopathologie et Génétique du Neurone et du Muscle, UMR5261, U1315, Institut NeuroMyoGène, 69008, Lyon, France
- Univ Lyon, Université Claude Bernard Lyon 1, Inserm, Stem Cell and Brain Research Institute U1208, 69500, Bron, France
| | - Martijn Kerkhofs
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Inserm, Physiopathologie et Génétique du Neurone et du Muscle, UMR5261, U1315, Institut NeuroMyoGène, 69008, Lyon, France
| | - Raphael Dos Reis
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Inserm, Physiopathologie et Génétique du Neurone et du Muscle, UMR5261, U1315, Institut NeuroMyoGène, 69008, Lyon, France
| | - Audrey Garcia
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Inserm, Physiopathologie et Génétique du Neurone et du Muscle, UMR5261, U1315, Institut NeuroMyoGène, 69008, Lyon, France
| | - Camille Blondet
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Inserm, Physiopathologie et Génétique du Neurone et du Muscle, UMR5261, U1315, Institut NeuroMyoGène, 69008, Lyon, France
| | - Alizée Amar
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Inserm, Physiopathologie et Génétique du Neurone et du Muscle, UMR5261, U1315, Institut NeuroMyoGène, 69008, Lyon, France
| | - Anita Kneppers
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Inserm, Physiopathologie et Génétique du Neurone et du Muscle, UMR5261, U1315, Institut NeuroMyoGène, 69008, Lyon, France
| | - Hélène Polvèche
- Laboratoire de Biologie et Modelisation de la Cellule, Ecole Normale Superieure de Lyon, CNRS, UMR 5239, Inserm, U1293, Universite Claude Bernard Lyon 1, 46 allée d'Italie F-69364, Lyon, France
- CECS/AFM, I-STEM, 28 rue Henri Desbruères, F-91100, Corbeil-Essonnes, France
| | - Damien Plassard
- CNRS UMR 7104, INSERM U1258, GenomEast Platform, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Université de Strasbourg, Illkirch, France
| | - Marc Foretz
- Université Paris Cité, CNRS, Inserm, Institut Cochin, Paris, France
| | - Benoit Viollet
- Université Paris Cité, CNRS, Inserm, Institut Cochin, Paris, France
| | - Kei Sakamoto
- Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen, 2200, Denmark
| | - Rémi Mounier
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Inserm, Physiopathologie et Génétique du Neurone et du Muscle, UMR5261, U1315, Institut NeuroMyoGène, 69008, Lyon, France
| | - Cyril F Bourgeois
- Laboratoire de Biologie et Modelisation de la Cellule, Ecole Normale Superieure de Lyon, CNRS, UMR 5239, Inserm, U1293, Universite Claude Bernard Lyon 1, 46 allée d'Italie F-69364, Lyon, France
| | - Olivier Raineteau
- Univ Lyon, Université Claude Bernard Lyon 1, Inserm, Stem Cell and Brain Research Institute U1208, 69500, Bron, France
| | - Evelyne Goillot
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Inserm, Physiopathologie et Génétique du Neurone et du Muscle, UMR5261, U1315, Institut NeuroMyoGène, 69008, Lyon, France
| | - Julien Courchet
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Inserm, Physiopathologie et Génétique du Neurone et du Muscle, UMR5261, U1315, Institut NeuroMyoGène, 69008, Lyon, France.
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2
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Sneyers F, Kerkhofs M, Speelman-Rooms F, Welkenhuyzen K, La Rovere R, Shemy A, Voet A, Eelen G, Dewerchin M, Tait SWG, Ghesquière B, Bootman MD, Bultynck G. Intracellular BAPTA directly inhibits PFKFB3, thereby impeding mTORC1-driven Mcl-1 translation and killing MCL-1-addicted cancer cells. Cell Death Dis 2023; 14:600. [PMID: 37684238 PMCID: PMC10491774 DOI: 10.1038/s41419-023-06120-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 08/10/2023] [Accepted: 08/29/2023] [Indexed: 09/10/2023]
Abstract
Intracellular Ca2+ signals control several physiological and pathophysiological processes. The main tool to chelate intracellular Ca2+ is intracellular BAPTA (BAPTAi), usually introduced into cells as a membrane-permeant acetoxymethyl ester (BAPTA-AM). Previously, we demonstrated that BAPTAi enhanced apoptosis induced by venetoclax, a BCL-2 antagonist, in diffuse large B-cell lymphoma (DLBCL). This finding implied a novel interplay between intracellular Ca2+ signaling and anti-apoptotic BCL-2 function. Hence, we set out to identify the underlying mechanisms by which BAPTAi enhances cell death in B-cell cancers. In this study, we discovered that BAPTAi alone induced apoptosis in hematological cancer cell lines that were highly sensitive to S63845, an MCL-1 antagonist. BAPTAi provoked a rapid decline in MCL-1-protein levels by inhibiting mTORC1-driven Mcl-1 translation. These events were not a consequence of cell death, as BAX/BAK-deficient cancer cells exhibited similar downregulation of mTORC1 activity and MCL-1-protein levels. Next, we investigated how BAPTAi diminished mTORC1 activity and identified its ability to impair glycolysis by directly inhibiting 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase 3 (PFKFB3) activity, a previously unknown effect of BAPTAi. Notably, these effects were also induced by a BAPTAi analog with low affinity for Ca2+. Consequently, our findings uncover PFKFB3 inhibition as an Ca2+-independent mechanism through which BAPTAi impairs cellular metabolism and ultimately compromises the survival of MCL-1-dependent cancer cells. These findings hold two important implications. Firstly, the direct inhibition of PFKFB3 emerges as a key regulator of mTORC1 activity and a promising target in MCL-1-dependent cancers. Secondly, cellular effects caused by BAPTAi are not necessarily related to Ca2+ signaling. Our data support the need for a reassessment of the role of Ca2+ in cellular processes when findings were based on the use of BAPTAi.
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Affiliation(s)
- Flore Sneyers
- KU Leuven, Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, Campus Gasthuisberg O&N I, Herestraat 49 box 802, 3000, Leuven, Belgium
| | - Martijn Kerkhofs
- KU Leuven, Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, Campus Gasthuisberg O&N I, Herestraat 49 box 802, 3000, Leuven, Belgium
| | - Femke Speelman-Rooms
- KU Leuven, Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, Campus Gasthuisberg O&N I, Herestraat 49 box 802, 3000, Leuven, Belgium
- KU Leuven, Laboratory of Chemical Biology, Department of Cellular and Molecular Medicine, Campus Gasthuisberg O&N I bis, Herestraat 49 box 901, 3000, Leuven, Belgium
| | - Kirsten Welkenhuyzen
- KU Leuven, Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, Campus Gasthuisberg O&N I, Herestraat 49 box 802, 3000, Leuven, Belgium
| | - Rita La Rovere
- KU Leuven, Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, Campus Gasthuisberg O&N I, Herestraat 49 box 802, 3000, Leuven, Belgium
| | - Ahmed Shemy
- KU Leuven, Laboratory for Biomolecular Modelling and Design, Department of Chemistry, Celestijnenlaan 200G, 3001, Heverlee, Belgium
| | - Arnout Voet
- KU Leuven, Laboratory for Biomolecular Modelling and Design, Department of Chemistry, Celestijnenlaan 200G, 3001, Heverlee, Belgium
| | - Guy Eelen
- KU Leuven, Laboratory of Angiogenesis and Vascular Metabolism, Department of Oncology, Leuven Cancer Institute, Campus Gasthuisberg O&N4, Herestraat 49 box 912, Leuven, Belgium
- VIB-KU Leuven, Center for Cancer Biology, Laboratory of Angiogenesis and Vascular Metabolism, Campus Gasthuisberg O&N4, Herestraat 49 box 912, 3000, Leuven, Belgium
| | - Mieke Dewerchin
- KU Leuven, Laboratory of Angiogenesis and Vascular Metabolism, Department of Oncology, Leuven Cancer Institute, Campus Gasthuisberg O&N4, Herestraat 49 box 912, Leuven, Belgium
- VIB-KU Leuven, Center for Cancer Biology, Laboratory of Angiogenesis and Vascular Metabolism, Campus Gasthuisberg O&N4, Herestraat 49 box 912, 3000, Leuven, Belgium
| | - Stephen W G Tait
- Cancer Research UK Beatson Institute, School of Cancer Sciences, University of Glasgow, Glasgow, UK
| | - Bart Ghesquière
- KU Leuven, Laboratory of Applied Mass Spectrometry, Department of Cellular and Molecular Medicine, Leuven, Belgium - VIB, Metabolomics Core Facility Leuven, Center for Cancer Biology, Leuven, Belgium, Herestraat 49 box 912, 3000, Leuven, Belgium
| | - Martin D Bootman
- School of Life, Health and Chemical Sciences, Faculty of Science, Technology, Engineering and Mathematics, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK.
| | - Geert Bultynck
- KU Leuven, Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, Campus Gasthuisberg O&N I, Herestraat 49 box 802, 3000, Leuven, Belgium.
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3
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de Ridder I, Kerkhofs M, Lemos FO, Loncke J, Bultynck G, Parys JB. The ER-mitochondria interface, where Ca 2+ and cell death meet. Cell Calcium 2023; 112:102743. [PMID: 37126911 DOI: 10.1016/j.ceca.2023.102743] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2023] [Revised: 04/20/2023] [Accepted: 04/24/2023] [Indexed: 05/03/2023]
Abstract
Endoplasmic reticulum (ER)-mitochondria contact sites are crucial to allow Ca2+ flux between them and a plethora of proteins participate in tethering both organelles together. Inositol 1,4,5-trisphosphate receptors (IP3Rs) play a pivotal role at such contact sites, participating in both ER-mitochondria tethering and as Ca2+-transport system that delivers Ca2+ from the ER towards mitochondria. At the ER-mitochondria contact sites, the IP3Rs function as a multi-protein complex linked to the voltage-dependent anion channel 1 (VDAC1) in the outer mitochondrial membrane, via the chaperone glucose-regulated protein 75 (GRP75). This IP3R-GRP75-VDAC1 complex supports the efficient transfer of Ca2+ from the ER into the mitochondrial intermembrane space, from which the Ca2+ ions can reach the mitochondrial matrix through the mitochondrial calcium uniporter. Under physiological conditions, basal Ca2+ oscillations deliver Ca2+ to the mitochondrial matrix, thereby stimulating mitochondrial oxidative metabolism. However, when mitochondrial Ca2+ overload occurs, the increase in [Ca2+] will induce the opening of the mitochondrial permeability transition pore, thereby provoking cell death. The IP3R-GRP75-VDAC1 complex forms a hub for several other proteins that stabilize the complex and/or regulate the complex's ability to channel Ca2+ into the mitochondria. These proteins and their mechanisms of action are discussed in the present review with special attention for their role in pathological conditions and potential implication for therapeutic strategies.
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Affiliation(s)
- Ian de Ridder
- KU Leuven, Laboratory for Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine & Leuven Kanker Instituut, Campus Gasthuisberg O/N-1 B-802, Herestraat 49, Leuven BE-3000, Belgium
| | - Martijn Kerkhofs
- KU Leuven, Laboratory for Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine & Leuven Kanker Instituut, Campus Gasthuisberg O/N-1 B-802, Herestraat 49, Leuven BE-3000, Belgium
| | - Fernanda O Lemos
- KU Leuven, Laboratory for Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine & Leuven Kanker Instituut, Campus Gasthuisberg O/N-1 B-802, Herestraat 49, Leuven BE-3000, Belgium
| | - Jens Loncke
- KU Leuven, Laboratory for Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine & Leuven Kanker Instituut, Campus Gasthuisberg O/N-1 B-802, Herestraat 49, Leuven BE-3000, Belgium
| | - Geert Bultynck
- KU Leuven, Laboratory for Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine & Leuven Kanker Instituut, Campus Gasthuisberg O/N-1 B-802, Herestraat 49, Leuven BE-3000, Belgium.
| | - Jan B Parys
- KU Leuven, Laboratory for Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine & Leuven Kanker Instituut, Campus Gasthuisberg O/N-1 B-802, Herestraat 49, Leuven BE-3000, Belgium.
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4
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Kerkhofs M, Vervloessem T, Luyten T, Stopa KB, Chen J, Vangheluwe P, Bultynck G, Vervliet T. The alkalinizing, lysosomotropic agent ML-9 induces a pH-dependent depletion of ER Ca 2+ stores in cellulo. Biochim Biophys Acta Mol Cell Res 2022; 1869:119308. [PMID: 35710019 DOI: 10.1016/j.bbamcr.2022.119308] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 04/30/2022] [Accepted: 05/30/2022] [Indexed: 06/15/2023]
Abstract
ML-9 elicits a broad spectrum of effects in cells, including inhibition of myosin light chain kinase, inhibition of store-operated Ca2+ entry and lysosomotropic actions that result in prostate cancer cell death. Moreover, the compound also affects endoplasmic reticulum (ER) Ca2+ homeostasis, although the underlying mechanisms remain unclear. We found that ML-9 provokes a rapid mobilization of Ca2+ from ER independently of IP3Rs or TMBIM6/Bax Inhibitor-1, two ER Ca2+-leak channels. Moreover, in unidirectional 45Ca2+ fluxes in permeabilized cells, ML-9 was able to reduce ER Ca2+-store content. Although the ER Ca2+ store content was decreased, ML-9 did not directly inhibit SERCA's ATPase activity in vitro using microsomal preparations. Consistent with its chemical properties as a cell-permeable weak alkalinizing agent (calculated pKa of 8.04), ML-9 provoked a rapid increase in cytosolic pH preceding the Ca2+ efflux from the ER. Pre-treatment with the weak acid 3NPA blunted the ML-9-evoked increase in intracellular pH and subsequent ML-9-induced Ca2+ mobilization from the ER. This experiment underpins a causal link between ML-9's impact on the pH and Ca2+ dynamics. Overall, our work indicates that the lysosomotropic drug ML-9 may not only impact lysosomal compartments but also have severe impacts on ER Ca2+ handling in cellulo.
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Affiliation(s)
- Martijn Kerkhofs
- KU Leuven, Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, 3000 Leuven, Belgium
| | - Tamara Vervloessem
- KU Leuven, Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, 3000 Leuven, Belgium
| | - Tomas Luyten
- KU Leuven, Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, 3000 Leuven, Belgium
| | - Kinga B Stopa
- Jagiellonian University, Malopolska Centre of Biotechnology, 30-387 Krakow, Poland
| | - Jialin Chen
- KU Leuven, Laboratory of Cellular Transport Systems, Department of Cellular and Molecular Medicine, 3000 Leuven, Belgium
| | - Peter Vangheluwe
- KU Leuven, Laboratory of Cellular Transport Systems, Department of Cellular and Molecular Medicine, 3000 Leuven, Belgium
| | - Geert Bultynck
- KU Leuven, Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, 3000 Leuven, Belgium.
| | - Tim Vervliet
- KU Leuven, Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, 3000 Leuven, Belgium.
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Pichla M, Sneyers F, Stopa KB, Bultynck G, Kerkhofs M. Dynamic control of mitochondria-associated membranes by kinases and phosphatases in health and disease. Cell Mol Life Sci 2021; 78:6541-6556. [PMID: 34448890 DOI: 10.1007/s00018-021-03920-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Revised: 07/27/2021] [Accepted: 08/11/2021] [Indexed: 10/20/2022]
Abstract
Membrane-contact sites are getting more and more credit for their indispensable role in maintenance of cell function and homeostasis. In the last decades, the ER-mitochondrial contact sites in particular received a lot of attention. While our knowledge of ER-mitochondrial contact sites increases steadily, the focus often lies on a static exploration of their functions. However, it is increasingly clear that these contact sites are very dynamic. In this review, we highlight the dynamic nature of ER-mitochondrial contact sites and the role of kinases and phosphatases therein with a focus on recent findings. Phosphorylation events allow for rapid integration of information on the protein level, impacting protein function, localization and interaction at ER-mitochondrial contact sites. To illustrate the importance of these events and to put them in a broader perspective, we connect them to pathologies like diabetes type II, Parkinson's disease and cancer.
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Affiliation(s)
- Monika Pichla
- Department of Analytical Biochemistry, Institute of Food Technology and Nutrition, College of Natural Sciences, Rzeszow University, Rzeszow, Poland
| | - Flore Sneyers
- Lab for Molecular and Cellular Signalling, Department for Cellular and Molecular Medicine, Leuven Kanker Instituut, KU Leuven, Leuven, Belgium
| | - Kinga B Stopa
- Malopolska Centre of Biotechnology, Jagiellonian University, Krakow, Poland
| | - Geert Bultynck
- Lab for Molecular and Cellular Signalling, Department for Cellular and Molecular Medicine, Leuven Kanker Instituut, KU Leuven, Leuven, Belgium
| | - Martijn Kerkhofs
- Lab for Molecular and Cellular Signalling, Department for Cellular and Molecular Medicine, Leuven Kanker Instituut, KU Leuven, Leuven, Belgium.
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de Ridder I, Rosa N, Kerkhofs M, Bultynck G. Bok joining the "Ca 2+ club". Cell Calcium 2021; 98:102438. [PMID: 34252745 DOI: 10.1016/j.ceca.2021.102438] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2021] [Revised: 06/22/2021] [Accepted: 06/23/2021] [Indexed: 11/26/2022]
Affiliation(s)
- Ian de Ridder
- KU Leuven, Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, and Leuven Kanker Instituut, Campus Gasthuisberg O/N-1 Bus 802, Herestraat 49, 3000 Leuven, Belgium
| | - Nicolas Rosa
- KU Leuven, Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, and Leuven Kanker Instituut, Campus Gasthuisberg O/N-1 Bus 802, Herestraat 49, 3000 Leuven, Belgium
| | - Martijn Kerkhofs
- KU Leuven, Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, and Leuven Kanker Instituut, Campus Gasthuisberg O/N-1 Bus 802, Herestraat 49, 3000 Leuven, Belgium
| | - Geert Bultynck
- KU Leuven, Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, and Leuven Kanker Instituut, Campus Gasthuisberg O/N-1 Bus 802, Herestraat 49, 3000 Leuven, Belgium.
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7
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Kerkhofs M, Bultynck G. Getting old without type 2 IP3 receptors. Cell Calcium 2021; 98:102437. [PMID: 34252746 DOI: 10.1016/j.ceca.2021.102437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 06/17/2021] [Accepted: 06/18/2021] [Indexed: 10/21/2022]
Affiliation(s)
- Martijn Kerkhofs
- KU Leuven, Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, and Leuven Kanker Instituut, Campus Gasthuisberg O/N-1 Bus 802, Herestraat 49, 3000 Leuven, Belgium
| | - Geert Bultynck
- KU Leuven, Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, and Leuven Kanker Instituut, Campus Gasthuisberg O/N-1 Bus 802, Herestraat 49, 3000 Leuven, Belgium.
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8
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Kerkhofs M, La Rovere R, Welkenhuysen K, Janssens A, Vandenberghe P, Madesh M, Parys JB, Bultynck G. BIRD-2, a BH4-domain-targeting peptide of Bcl-2, provokes Bax/Bak-independent cell death in B-cell cancers through mitochondrial Ca 2+-dependent mPTP opening. Cell Calcium 2021; 94:102333. [PMID: 33450506 DOI: 10.1016/j.ceca.2020.102333] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 12/10/2020] [Accepted: 12/10/2020] [Indexed: 02/07/2023]
Abstract
Anti-apoptotic Bcl-2 critically controls cell death by neutralizing pro-apoptotic Bcl-2-family members at the mitochondria. Bcl-2 proteins also act at the endoplasmic reticulum, the main intracellular Ca2+-storage organelle, where they inhibit IP3 receptors (IP3R) and prevent pro-apoptotic Ca2+-signaling events. IP3R channels are targeted by the BH4 domain of Bcl-2. Some cancer types rely on the IP3R-Bcl-2 interaction for survival. We previously developed a cell-permeable, BH4-domain-targeting peptide that can abrogate Bcl-2's inhibitory action on IP3Rs, named Bcl-2 IP3 receptor disrupter-2 (BIRD-2). This peptide kills several Bcl-2-dependent cancer cell types, including diffuse large B-cell lymphoma (DLBCL) and chronic lymphocytic leukaemia (CLL) cells, by eliciting intracellular Ca2+ signalling. However, the exact mechanisms by which these excessive Ca2+ signals triggered by BIRD-2 provoke cancer cell death remain elusive. Here, we demonstrate in DLBCL that although BIRD-2 activates caspase 3/7 and provokes cell death in a caspase-dependent manner, the cell death is independent of pro-apoptotic Bcl-2-family members, Bim, Bax and Bak. Instead, BIRD-2 provokes mitochondrial Ca2+ overload that is rapidly followed by opening of the mitochondrial permeability transition pore (mPTP). Inhibiting mitochondrial Ca2+ overload using Ru265, an inhibitor of the mitochondrial Ca2+ uniporter complex counteracts BIRD-2-induced cancer cell death. Finally, we validated our findings in primary CLL patient samples where BIRD-2 provoked mitochondrial Ca2+ overload and Ru265 counteracted BIRD-2-induced cell death. Overall, this work reveals the mechanisms by which BIRD-2 provokes cell death, which occurs via mitochondrial Ca2+ overload but acts independently of pro-apoptotic Bcl-2-family members.
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Affiliation(s)
- Martijn Kerkhofs
- Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, Leuven Cancer Institute (LKI), KU Leuven, Campus Gasthuisberg O/N-1 Bus 802, Herestraat 49, 3000, Leuven, Belgium
| | - Rita La Rovere
- Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, Leuven Cancer Institute (LKI), KU Leuven, Campus Gasthuisberg O/N-1 Bus 802, Herestraat 49, 3000, Leuven, Belgium
| | - Kirsten Welkenhuysen
- Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, Leuven Cancer Institute (LKI), KU Leuven, Campus Gasthuisberg O/N-1 Bus 802, Herestraat 49, 3000, Leuven, Belgium
| | - Ann Janssens
- Department of Hematology, UZ Leuven, Leuven, Belgium
| | - Peter Vandenberghe
- Department of Hematology, UZ Leuven, Leuven, Belgium; Department of Human Genetics, KU Leuven, Leuven, Belgium
| | - Muniswamy Madesh
- Department of Medicine/Cardiology, Institute for Precision Medicine and Health, University of Texas Health San Antonio, San Antonio, TX 78229, United States
| | - Jan B Parys
- Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, Leuven Cancer Institute (LKI), KU Leuven, Campus Gasthuisberg O/N-1 Bus 802, Herestraat 49, 3000, Leuven, Belgium
| | - Geert Bultynck
- Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, Leuven Cancer Institute (LKI), KU Leuven, Campus Gasthuisberg O/N-1 Bus 802, Herestraat 49, 3000, Leuven, Belgium.
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Loncke J, Kerkhofs M, Kaasik A, Bezprozvanny I, Bultynck G. Recent advances in understanding IP3R function with focus on ER-mitochondrial Ca2+ transfers. Current Opinion in Physiology 2020. [DOI: 10.1016/j.cophys.2020.07.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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10
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Kerkhofs M, Vervloessem T, Stopa KB, Smith VM, Vogler M, Bultynck G. DLBCL Cells with Acquired Resistance to Venetoclax Are Not Sensitized to BIRD-2 But Can Be Resensitized to Venetoclax through Bcl-XL Inhibition. Biomolecules 2020; 10:biom10071081. [PMID: 32708132 PMCID: PMC7408247 DOI: 10.3390/biom10071081] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 07/16/2020] [Accepted: 07/16/2020] [Indexed: 02/06/2023] Open
Abstract
Anti-apoptotic Bcl-2-family members are frequently dysregulated in both blood and solid cancers, contributing to their survival despite ongoing oncogenic stress. Yet, such cancer cells often are highly dependent on Bcl-2 for their survival, a feature that is exploited by so-called BH3-mimetic drugs. Venetoclax (ABT-199) is a selective BH3-mimetic Bcl-2 antagonist that is currently used in the clinic for treatment of chronic lymphocytic leukemia patients. Unfortunately, venetoclax resistance has already emerged in patients, limiting the therapeutic success. Here, we examined strategies to overcome venetoclax resistance. Therefore, we used two diffuse large B-cell lymphoma (DLBCL) cell lines, Riva WT and venetoclax-resistant Riva (VR). The latter was obtained by prolonged culturing in the presence of venetoclax. We report that Riva VR cells did not become more sensitive to BIRD-2, a peptide targeting the Bcl-2 BH4 domain, and established cross-resistance towards BDA-366, a putative BH4-domain antagonist of Bcl-2. However, we found that Bcl-XL, another Bcl-2-family protein, is upregulated in Riva VR, while Mcl-1 expression levels are not different in comparison with Riva WT, hinting towards an increased dependence of Riva VR cells to Bcl-XL. Indeed, Riva VR cells could be resensitized to venetoclax by A-1155463, a selective BH3 mimetic Bcl-XL inhibitor. This is underpinned by siRNA experiments, demonstrating that lowering Bcl-XL-expression levels also augmented the sensitivity of Riva VR cells to venetoclax. Overall, this work demonstrates that Bcl-XL upregulation contributes to acquired resistance of DLBCL cancer cells towards venetoclax and that antagonizing Bcl-XL can resensitize such cells towards venetoclax.
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Affiliation(s)
- Martijn Kerkhofs
- Lab. Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine and Leuven Kanker Instituut, Campus Gasthuisberg ON-I, KU Leuven, 3000 Leuven, Belgium; (M.K.); (T.V.)
| | - Tamara Vervloessem
- Lab. Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine and Leuven Kanker Instituut, Campus Gasthuisberg ON-I, KU Leuven, 3000 Leuven, Belgium; (M.K.); (T.V.)
| | - Kinga B. Stopa
- Malopolska Centre of Biotechnology, Jagiellonian University, 30-387 Krakow, Poland;
| | - Victoria M. Smith
- Department of Molecular and Cell Biology, University of Leicester, Leicester LE1 7RH, UK;
| | - Meike Vogler
- Institute for Experimental Cancer Research in Pediatrics, Goethe-University, 60528 Frankfurt, Germany;
| | - Geert Bultynck
- Lab. Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine and Leuven Kanker Instituut, Campus Gasthuisberg ON-I, KU Leuven, 3000 Leuven, Belgium; (M.K.); (T.V.)
- Correspondence:
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11
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Kerkhofs M. Cytosolic Ca 2+ oversees the MASs production of pyruvate for the mitochondrial market. Cell Calcium 2020; 89:102223. [PMID: 32505042 DOI: 10.1016/j.ceca.2020.102223] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 05/19/2020] [Accepted: 05/19/2020] [Indexed: 12/27/2022]
Abstract
It is generally accepted that mitochondrial Ca2+ controls the pace of mitochondrial bioenergetics and thus ATP production. Szibor et al. challenge this paradigm, proposing that the balance between ATP consumption and production depends on mitochondrial pyruvate supply via the malate-aspartate shuttle (MAS) and is controlled by cytosolic Ca2+.
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Affiliation(s)
- Martijn Kerkhofs
- Laboratory for Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine and Leuven Kanker Instituut, KU Leuven, Leuven, Belgium.
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12
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Kim J, Gupta R, Blanco LP, Yang S, Shteinfer-Kuzmine A, Wang K, Zhu J, Yoon HE, Wang X, Kerkhofs M, Kang H, Brown AL, Park SJ, Xu X, Zandee van Rilland E, Kim MK, Cohen JI, Kaplan MJ, Shoshan-Barmatz V, Chung JH. VDAC oligomers form mitochondrial pores to release mtDNA fragments and promote lupus-like disease. Science 2019; 366:1531-1536. [PMID: 31857488 DOI: 10.1126/science.aav4011] [Citation(s) in RCA: 317] [Impact Index Per Article: 63.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 07/09/2019] [Accepted: 10/29/2019] [Indexed: 12/14/2022]
Abstract
Mitochondrial stress releases mitochondrial DNA (mtDNA) into the cytosol, thereby triggering the type Ι interferon (IFN) response. Mitochondrial outer membrane permeabilization, which is required for mtDNA release, has been extensively studied in apoptotic cells, but little is known about its role in live cells. We found that oxidatively stressed mitochondria release short mtDNA fragments via pores formed by the voltage-dependent anion channel (VDAC) oligomers in the mitochondrial outer membrane. Furthermore, the positively charged residues in the N-terminal domain of VDAC1 interact with mtDNA, promoting VDAC1 oligomerization. The VDAC oligomerization inhibitor VBIT-4 decreases mtDNA release, IFN signaling, neutrophil extracellular traps, and disease severity in a mouse model of systemic lupus erythematosus. Thus, inhibiting VDAC oligomerization is a potential therapeutic approach for diseases associated with mtDNA release.
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Affiliation(s)
- Jeonghan Kim
- Laboratory of Obesity and Aging Research, Cardiovascular Branch, National Heart Lung and Blood Institute, Bethesda, MD 20892, USA
| | - Rajeev Gupta
- Department of Life Sciences and National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Luz P Blanco
- Systemic Autoimmunity Branch, National Institute of Arthritis and Musculoskeletal and Skin Diseases, Bethesda, MD 20982, USA
| | - Shutong Yang
- Laboratory of Obesity and Aging Research, Cardiovascular Branch, National Heart Lung and Blood Institute, Bethesda, MD 20892, USA
| | - Anna Shteinfer-Kuzmine
- Department of Life Sciences and National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Kening Wang
- Medical Virology Section, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, Bethesda, MD 20892, USA
| | - Jun Zhu
- Systems Biology Center, National Heart, Lung, and Blood Institute, Bethesda, MD 20892, USA.,Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, and Leuven Kanker Instituut, KU Leuven, 3000 Leuven, Belgium
| | - Hee Eun Yoon
- Laboratory of Obesity and Aging Research, Cardiovascular Branch, National Heart Lung and Blood Institute, Bethesda, MD 20892, USA
| | - Xinghao Wang
- Systemic Autoimmunity Branch, National Institute of Arthritis and Musculoskeletal and Skin Diseases, Bethesda, MD 20982, USA
| | | | - Hyeog Kang
- Laboratory of Obesity and Aging Research, Cardiovascular Branch, National Heart Lung and Blood Institute, Bethesda, MD 20892, USA
| | - Alexandra L Brown
- Laboratory of Obesity and Aging Research, Cardiovascular Branch, National Heart Lung and Blood Institute, Bethesda, MD 20892, USA
| | - Sung-Jun Park
- Laboratory of Obesity and Aging Research, Cardiovascular Branch, National Heart Lung and Blood Institute, Bethesda, MD 20892, USA
| | - Xihui Xu
- Laboratory of Obesity and Aging Research, Cardiovascular Branch, National Heart Lung and Blood Institute, Bethesda, MD 20892, USA
| | - Eddy Zandee van Rilland
- Laboratory of Obesity and Aging Research, Cardiovascular Branch, National Heart Lung and Blood Institute, Bethesda, MD 20892, USA
| | - Myung K Kim
- Laboratory of Obesity and Aging Research, Cardiovascular Branch, National Heart Lung and Blood Institute, Bethesda, MD 20892, USA
| | - Jeffrey I Cohen
- Medical Virology Section, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, Bethesda, MD 20892, USA
| | - Mariana J Kaplan
- Systemic Autoimmunity Branch, National Institute of Arthritis and Musculoskeletal and Skin Diseases, Bethesda, MD 20982, USA
| | - Varda Shoshan-Barmatz
- Department of Life Sciences and National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Jay H Chung
- Laboratory of Obesity and Aging Research, Cardiovascular Branch, National Heart Lung and Blood Institute, Bethesda, MD 20892, USA.
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13
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Carreras-Sureda A, Jaña F, Urra H, Durand S, Mortenson DE, Sagredo A, Bustos G, Hazari Y, Ramos-Fernández E, Sassano ML, Pihán P, van Vliet AR, González-Quiroz M, Torres AK, Tapia-Rojas C, Kerkhofs M, Vicente R, Kaufman RJ, Inestrosa NC, Gonzalez-Billault C, Wiseman RL, Agostinis P, Bultynck G, Court FA, Kroemer G, Cárdenas JC, Hetz C. Publisher Correction: Non-canonical function of IRE1α determines mitochondria-associated endoplasmic reticulum composition to control calcium transfer and bioenergetics. Nat Cell Biol 2019; 21:913. [PMID: 31201389 DOI: 10.1038/s41556-019-0355-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
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Affiliation(s)
- Amado Carreras-Sureda
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile.,FONDAP Geroscience Center for Brain Health and Metabolism, Santiago, Chile.,Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - Fabián Jaña
- FONDAP Geroscience Center for Brain Health and Metabolism, Santiago, Chile.,Anatomy and Developmental Biology Program, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - Hery Urra
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile.,FONDAP Geroscience Center for Brain Health and Metabolism, Santiago, Chile.,Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - Sylvere Durand
- Equipe Labellisée par la Ligue contre le cancer, Université Paris Descartes, Université Sorbonne Paris Cité, Université Paris Diderot, Sorbonne Université, INSERM U1138, Centre de Recherche des Cordeliers, Paris, France.,Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
| | - David E Mortenson
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA, USA
| | - Alfredo Sagredo
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile.,FONDAP Geroscience Center for Brain Health and Metabolism, Santiago, Chile.,Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - Galdo Bustos
- FONDAP Geroscience Center for Brain Health and Metabolism, Santiago, Chile.,Anatomy and Developmental Biology Program, Institute of Biomedical Sciences, University of Chile, Santiago, Chile.,Center for Integrative Biology, Faculty of Sciences, Universidad Mayor, Santiago, Chile
| | - Younis Hazari
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile.,FONDAP Geroscience Center for Brain Health and Metabolism, Santiago, Chile.,Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - Eva Ramos-Fernández
- Center for Aging and Regeneration, Department of Cell and Molecular Biology, Faculty of Biological Sciences, Pontifical Catholic University of Chile, Santiago, Chile
| | - Maria L Sassano
- Laboratory of Cell Death Research and Therapy, Department of Cellular and Molecular Medicine, VIB-KU Leuven Center for Cancer Biology, KU Leuven, Leuven, Belgium
| | - Philippe Pihán
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile.,FONDAP Geroscience Center for Brain Health and Metabolism, Santiago, Chile.,Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - Alexander R van Vliet
- Laboratory of Cell Death Research and Therapy, Department of Cellular and Molecular Medicine, VIB-KU Leuven Center for Cancer Biology, KU Leuven, Leuven, Belgium
| | - Matías González-Quiroz
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile.,FONDAP Geroscience Center for Brain Health and Metabolism, Santiago, Chile.,Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - Angie K Torres
- Laboratory of Neurobiology of Aging, Centro de Biología Celular y Biomedicina, Facultad de Medicina y Ciencia, Universidad San Sebastián, Santiago, Chile
| | - Cheril Tapia-Rojas
- Laboratory of Neurobiology of Aging, Centro de Biología Celular y Biomedicina, Facultad de Medicina y Ciencia, Universidad San Sebastián, Santiago, Chile
| | - Martijn Kerkhofs
- Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine and Leuven Kanker Instituut, KU Leuven, Leuven, Belgium
| | - Rubén Vicente
- Laboratory of Molecular Physiology, Department of Experimental and Health Sciences, Universitat Pompeu Fabra, Barcelona, Spain
| | - Randal J Kaufman
- Degenerative Diseases Program, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA
| | - Nibaldo C Inestrosa
- Center for Aging and Regeneration, Department of Cell and Molecular Biology, Faculty of Biological Sciences, Pontifical Catholic University of Chile, Santiago, Chile
| | - Christian Gonzalez-Billault
- FONDAP Geroscience Center for Brain Health and Metabolism, Santiago, Chile.,Buck Institute for Research on Aging, Novato, CA, USA.,Department of Biology, Faculty of Sciences, University of Chile, Santiago, Chile
| | - R Luke Wiseman
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA, USA
| | - Patrizia Agostinis
- Laboratory of Cell Death Research and Therapy, Department of Cellular and Molecular Medicine, VIB-KU Leuven Center for Cancer Biology, KU Leuven, Leuven, Belgium
| | - Geert Bultynck
- Degenerative Diseases Program, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA
| | - Felipe A Court
- FONDAP Geroscience Center for Brain Health and Metabolism, Santiago, Chile.,Center for Integrative Biology, Faculty of Sciences, Universidad Mayor, Santiago, Chile
| | - Guido Kroemer
- Equipe Labellisée par la Ligue contre le cancer, Université Paris Descartes, Université Sorbonne Paris Cité, Université Paris Diderot, Sorbonne Université, INSERM U1138, Centre de Recherche des Cordeliers, Paris, France.,Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France.,Pôle de Biologie, Hôpital Européen Georges Pompidou, AP-HP, Paris, France.,Karolinska Institute, Department of Women's and Children's Health, Karolinska University Hospital, Stockholm, Sweden.,Suzhou Institute for Systems Biology, Chinese Academy of Sciences, Suzhou, China
| | - J César Cárdenas
- FONDAP Geroscience Center for Brain Health and Metabolism, Santiago, Chile.,Anatomy and Developmental Biology Program, Institute of Biomedical Sciences, University of Chile, Santiago, Chile.,Center for Integrative Biology, Faculty of Sciences, Universidad Mayor, Santiago, Chile.,Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, USA
| | - Claudio Hetz
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile. .,FONDAP Geroscience Center for Brain Health and Metabolism, Santiago, Chile. .,Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile. .,Buck Institute for Research on Aging, Novato, CA, USA. .,Department of Immunology and Infectious Diseases, Harvard School of Public Health, Boston, MA, USA.
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14
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Kerkhofs M, Bultynck G, Vervliet T, Monaco G. Therapeutic implications of novel peptides targeting ER-mitochondria Ca 2+-flux systems. Drug Discov Today 2019; 24:1092-1103. [PMID: 30910738 DOI: 10.1016/j.drudis.2019.03.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 02/16/2019] [Accepted: 03/18/2019] [Indexed: 01/03/2023]
Abstract
Intracellular Ca2+-flux systems located at the ER-mitochondrial axis govern mitochondrial Ca2+ balance and cell fate. Multiple yet incurable pathologies are characterized by insufficient or excessive Ca2+ fluxes toward the mitochondria, in turn leading to aberrant cell life or death dynamics. The discovery and ongoing molecular characterization of the main interorganellar Ca2+ gateways have resulted in a novel class of peptide tools able to regulate relevant protein-protein interactions (PPIs) underlying this signaling scenario. Here, we review peptides, molecularly derived from Ca2+-flux systems or their accessory proteins. We discuss how they alter Ca2+-signaling protein complexes and modulate cell survival in light of their forthcoming therapeutic applications.
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Affiliation(s)
- Martijn Kerkhofs
- KU Leuven, Department of Cellular and Molecular Medicine and Leuven Kanker Instituut, Laboratory of Molecular and Cellular Signaling, Campus Gasthuisberg O/N-I bus 802, Herestraat 49, 3000 Leuven, Belgium
| | - Geert Bultynck
- KU Leuven, Department of Cellular and Molecular Medicine and Leuven Kanker Instituut, Laboratory of Molecular and Cellular Signaling, Campus Gasthuisberg O/N-I bus 802, Herestraat 49, 3000 Leuven, Belgium.
| | - Tim Vervliet
- KU Leuven, Department of Cellular and Molecular Medicine and Leuven Kanker Instituut, Laboratory of Molecular and Cellular Signaling, Campus Gasthuisberg O/N-I bus 802, Herestraat 49, 3000 Leuven, Belgium
| | - Giovanni Monaco
- KU Leuven, Department of Cellular and Molecular Medicine and Leuven Kanker Instituut, Laboratory of Molecular and Cellular Signaling, Campus Gasthuisberg O/N-I bus 802, Herestraat 49, 3000 Leuven, Belgium.
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15
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Kerkhofs M, Vervloessem T, Bittremieux M, Bultynck G. Recent advances in uncovering the mechanisms contributing to BIRD-2-induced cell death in B-cell cancer cells. Cell Death Dis 2019; 10:42. [PMID: 30718472 PMCID: PMC6361978 DOI: 10.1038/s41419-018-1297-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Accepted: 12/12/2018] [Indexed: 12/13/2022]
MESH Headings
- Cell Death/drug effects
- Humans
- Lymphoma, B-Cell/drug therapy
- Lymphoma, B-Cell/genetics
- Lymphoma, B-Cell/metabolism
- Lymphoma, B-Cell/pathology
- Lymphoma, Large B-Cell, Diffuse/drug therapy
- Lymphoma, Large B-Cell, Diffuse/metabolism
- Lymphoma, Large B-Cell, Diffuse/pathology
- Peptides/pharmacology
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Affiliation(s)
- Martijn Kerkhofs
- KU Leuven, Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine and Leuven Kanker Instituut (LKI), Campus Gasthuisberg ON-I Bus 802, Leuven, Belgium
| | - Tamara Vervloessem
- KU Leuven, Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine and Leuven Kanker Instituut (LKI), Campus Gasthuisberg ON-I Bus 802, Leuven, Belgium
| | - Mart Bittremieux
- KU Leuven, Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine and Leuven Kanker Instituut (LKI), Campus Gasthuisberg ON-I Bus 802, Leuven, Belgium
| | - Geert Bultynck
- KU Leuven, Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine and Leuven Kanker Instituut (LKI), Campus Gasthuisberg ON-I Bus 802, Leuven, Belgium.
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16
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Jakubowska MA, Kerkhofs M, Martines C, Efremov DG, Gerasimenko JV, Gerasimenko OV, Petersen OH, Bultynck G, Vervliet T, Ferdek PE. ABT-199 (Venetoclax), a BH3-mimetic Bcl-2 inhibitor, does not cause Ca 2+ -signalling dysregulation or toxicity in pancreatic acinar cells. Br J Pharmacol 2018; 176:4402-4415. [PMID: 30266036 PMCID: PMC6887725 DOI: 10.1111/bph.14505] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 08/21/2018] [Accepted: 09/13/2018] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND AND PURPOSE Many cancer cells depend on anti-apoptotic B-cell lymphoma 2 (Bcl-2) proteins for their survival. Bcl-2 antagonism through Bcl-2 homology 3 (BH3) mimetics has emerged as a novel anti-cancer therapy. ABT-199 (Venetoclax), a recently developed BH3 mimetic that selectively inhibits Bcl-2, was introduced into the clinic for treatment of relapsed chronic lymphocytic leukaemia. Early generations of Bcl-2 inhibitors evoked sustained Ca2+ responses in pancreatic acinar cells (PACs) inducing cell death. Therefore, BH3 mimetics could potentially be toxic for the pancreas when used to treat cancer. Although ABT-199 was shown to kill Bcl-2-dependent cancer cells without affecting intracellular Ca2+ signalling, its effects on PACs have not yet been determined. Hence, it is essential and timely to assess whether this recently approved anti-leukaemic drug might potentially have pancreatotoxic effects. EXPERIMENTAL APPROACH Single-cell Ca2+ measurements and cell death analysis were performed on isolated mouse PACs. KEY RESULTS Inhibition of Bcl-2 via ABT-199 did not elicit intracellular Ca2+ signalling on its own or potentiate Ca2+ signalling induced by physiological/pathophysiological stimuli in PACs. Although ABT-199 did not affect cell death in PACs, under conditions that killed ABT-199-sensitive cancer cells, cytosolic Ca2+ extrusion was slightly enhanced in the presence of ABT-199. In contrast, inhibition of Bcl-xL potentiated pathophysiological Ca2+ responses in PACs, without exacerbating cell death. CONCLUSION AND IMPLICATIONS Our results demonstrate that apart from having a modest effect on cytosolic Ca2+ extrusion, ABT-199 does not substantially alter intracellular Ca2+ homeostasis in normal PACs and should be safe for the pancreas during cancer treatment. LINKED ARTICLES This article is part of a themed section on Mitochondrial Pharmacology: Featured Mechanisms and Approaches for Therapy Translation. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v176.22/issuetoc.
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Affiliation(s)
- Monika A Jakubowska
- Medical Research Council Group, School of Biosciences, Cardiff University, Cardiff, UK.,International Associated Laboratory (LIA), Malopolska Centre of Biotechnology, Jagiellonian University, Krakow, Poland
| | - Martijn Kerkhofs
- Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Claudio Martines
- Molecular Hematology Unit, International Centre for Genetic Engineering and Biotechnology, Trieste, Italy
| | - Dimitar G Efremov
- Molecular Hematology Unit, International Centre for Genetic Engineering and Biotechnology, Trieste, Italy
| | - Julia V Gerasimenko
- Medical Research Council Group, School of Biosciences, Cardiff University, Cardiff, UK
| | - Oleg V Gerasimenko
- Medical Research Council Group, School of Biosciences, Cardiff University, Cardiff, UK
| | - Ole H Petersen
- Medical Research Council Group, School of Biosciences, Cardiff University, Cardiff, UK
| | - Geert Bultynck
- Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Tim Vervliet
- Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Pawel E Ferdek
- Medical Research Council Group, School of Biosciences, Cardiff University, Cardiff, UK.,Department of Cell Biology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland
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17
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Morciano G, Marchi S, Morganti C, Sbano L, Bittremieux M, Kerkhofs M, Corricelli M, Danese A, Karkucinska-Wieckowska A, Wieckowski MR, Bultynck G, Giorgi C, Pinton P. Role of Mitochondria-Associated ER Membranes in Calcium Regulation in Cancer-Specific Settings. Neoplasia 2018; 20:510-523. [PMID: 29626751 PMCID: PMC5916088 DOI: 10.1016/j.neo.2018.03.005] [Citation(s) in RCA: 85] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 02/25/2018] [Accepted: 03/01/2018] [Indexed: 12/31/2022] Open
Abstract
Mitochondria-associated endoplasmic reticulum (ER) membranes (MAMs) are highly specialized subcellular compartments that are shaped by ER subdomains juxtaposed to mitochondria but are biochemically distinct from pure ER and pure mitochondria. MAMs are enriched in enzymes involved in lipid synthesis and transport, channels for calcium transfer, and proteins with oncogenic/oncosuppressive functions that modulate cell signaling pathways involved in physiological and pathophysiological processes. The term "cancer" denotes a group of disorders that result from uncontrolled cell growth driven by a mixture of genetic and environmental components. Alterations in MAMs are thought to account for the onset as well as the progression and metastasis of cancer and have been a focus of investigation in recent years. In this review, we present the current state of the art regarding MAM-resident proteins and their relevance, alterations, and deregulating functions in different types of cancer from a cell biology and clinical perspective.
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Affiliation(s)
- Giampaolo Morciano
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology and LTTA center, University of Ferrara, Ferrara, Italy; Cecilia Hospital, GVM Care & Research, E.S.: Health Science Foundation, Cotignola, Italy
| | - Saverio Marchi
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology and LTTA center, University of Ferrara, Ferrara, Italy
| | - Claudia Morganti
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology and LTTA center, University of Ferrara, Ferrara, Italy
| | - Luigi Sbano
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology and LTTA center, University of Ferrara, Ferrara, Italy
| | - Mart Bittremieux
- KU Leuven, Lab. Molecular and Cellular Signaling, Dept. Cellular and Molecular Medicine and Leuven Kanker Instituut, Campus Gasthuisberg O&N 1 Box 802, Herestraat 49, 3000 Leuven, Belgium
| | - Martijn Kerkhofs
- KU Leuven, Lab. Molecular and Cellular Signaling, Dept. Cellular and Molecular Medicine and Leuven Kanker Instituut, Campus Gasthuisberg O&N 1 Box 802, Herestraat 49, 3000 Leuven, Belgium
| | - Mariangela Corricelli
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology and LTTA center, University of Ferrara, Ferrara, Italy
| | - Alberto Danese
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology and LTTA center, University of Ferrara, Ferrara, Italy
| | | | - Mariusz R Wieckowski
- Department of Biochemistry, Nencki Institute of Experimental Biology, Warsaw, Poland
| | - Geert Bultynck
- KU Leuven, Lab. Molecular and Cellular Signaling, Dept. Cellular and Molecular Medicine and Leuven Kanker Instituut, Campus Gasthuisberg O&N 1 Box 802, Herestraat 49, 3000 Leuven, Belgium
| | - Carlotta Giorgi
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology and LTTA center, University of Ferrara, Ferrara, Italy.
| | - Paolo Pinton
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology and LTTA center, University of Ferrara, Ferrara, Italy; Cecilia Hospital, GVM Care & Research, E.S.: Health Science Foundation, Cotignola, Italy; CNR Institute of Cell Biology and Neurobiology, Monterotondo, Italy.
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Kerkhofs M, Bittremieux M, Morciano G, Giorgi C, Pinton P, Parys JB, Bultynck G. Emerging molecular mechanisms in chemotherapy: Ca 2+ signaling at the mitochondria-associated endoplasmic reticulum membranes. Cell Death Dis 2018; 9:334. [PMID: 29491433 PMCID: PMC5832420 DOI: 10.1038/s41419-017-0179-0] [Citation(s) in RCA: 93] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 10/27/2017] [Accepted: 11/03/2017] [Indexed: 12/13/2022]
Abstract
Inter-organellar communication often takes the form of Ca2+ signals. These Ca2+ signals originate from the endoplasmic reticulum (ER) and regulate different cellular processes like metabolism, fertilization, migration, and cell fate. A prime target for Ca2+ signals are the mitochondria. ER-mitochondrial Ca2+ transfer is possible through the existence of mitochondria-associated ER membranes (MAMs), ER structures that are in the proximity of the mitochondria. This creates a micro-domain in which the Ca2+ concentrations are manifold higher than in the cytosol, allowing for rapid mitochondrial Ca2+ uptake. In the mitochondria, the Ca2+ signal is decoded differentially depending on its spatiotemporal characteristics. While Ca2+ oscillations stimulate metabolism and constitute pro-survival signaling, mitochondrial Ca2+ overload results in apoptosis. Many chemotherapeutics depend on efficient ER-mitochondrial Ca2+ signaling to exert their function. However, several oncogenes and tumor suppressors present in the MAMs can alter Ca2+ signaling in cancer cells, rendering chemotherapeutics ineffective. In this review, we will discuss recent studies that connect ER-mitochondrial Ca2+ transfer, tumor suppressors and oncogenes at the MAMs, and chemotherapy.
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Affiliation(s)
- Martijn Kerkhofs
- Department of Cellular and Molecular Medicine and Leuven Kanker Instituut, KU Leuven, Laboratory of Molecular and Cellular Signaling, Leuven, Belgium
| | - Mart Bittremieux
- Department of Cellular and Molecular Medicine and Leuven Kanker Instituut, KU Leuven, Laboratory of Molecular and Cellular Signaling, Leuven, Belgium
| | - Giampaolo Morciano
- 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, Italy
- Cecilia Hospital, GVM Care & Research, E.S: Health Science Foundation, Cotignola, Italy
| | - Carlotta Giorgi
- 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, 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, Italy
- Cecilia Hospital, GVM Care & Research, E.S: Health Science Foundation, Cotignola, Italy
- CNR Institute of Cell Biology and Neurobiology, Monterotondo, Italy
| | - Jan B Parys
- Department of Cellular and Molecular Medicine and Leuven Kanker Instituut, KU Leuven, Laboratory of Molecular and Cellular Signaling, Leuven, Belgium
| | - Geert Bultynck
- Department of Cellular and Molecular Medicine and Leuven Kanker Instituut, KU Leuven, Laboratory of Molecular and Cellular Signaling, Leuven, Belgium.
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19
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Ivanova H, Kerkhofs M, La Rovere RM, Bultynck G. Endoplasmic Reticulum-Mitochondrial Ca 2+ Fluxes Underlying Cancer Cell Survival. Front Oncol 2017; 7:70. [PMID: 28516062 PMCID: PMC5413502 DOI: 10.3389/fonc.2017.00070] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Accepted: 03/28/2017] [Indexed: 11/17/2022] Open
Abstract
Calcium ions (Ca2+) are crucial, ubiquitous, intracellular second messengers required for functional mitochondrial metabolism during uncontrolled proliferation of cancer cells. The mitochondria and the endoplasmic reticulum (ER) are connected via “mitochondria-associated ER membranes” (MAMs) where ER–mitochondria Ca2+ transfer occurs, impacting the mitochondrial biology related to several aspects of cellular survival, autophagy, metabolism, cell death sensitivity, and metastasis, all cancer hallmarks. Cancer cells appear addicted to these constitutive ER–mitochondrial Ca2+ fluxes for their survival, since they drive the tricarboxylic acid cycle and the production of mitochondrial substrates needed for nucleoside synthesis and proper cell cycle progression. In addition to this, the mitochondrial Ca2+ uniporter and mitochondrial Ca2+ have been linked to hypoxia-inducible factor 1α signaling, enabling metastasis and invasion processes, but they can also contribute to cellular senescence induced by oncogenes and replication. Finally, proper ER–mitochondrial Ca2+ transfer seems to be a key event in the cell death response of cancer cells exposed to chemotherapeutics. In this review, we discuss the emerging role of ER–mitochondrial Ca2+ fluxes underlying these cancer-related features.
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Affiliation(s)
- Hristina Ivanova
- Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, Leuven Kanker Instituut (LKI), KU Leuven, Leuven, Belgium
| | - Martijn Kerkhofs
- Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, Leuven Kanker Instituut (LKI), KU Leuven, Leuven, Belgium
| | - Rita M La Rovere
- Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, Leuven Kanker Instituut (LKI), KU Leuven, Leuven, Belgium
| | - Geert Bultynck
- Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, Leuven Kanker Instituut (LKI), KU Leuven, Leuven, Belgium
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20
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Marchi S, Bittremieux M, Missiroli S, Morganti C, Patergnani S, Sbano L, Rimessi A, Kerkhofs M, Parys JB, Bultynck G, Giorgi C, Pinton P. Endoplasmic Reticulum-Mitochondria Communication Through Ca 2+ Signaling: The Importance of Mitochondria-Associated Membranes (MAMs). Adv Exp Med Biol 2017; 997:49-67. [PMID: 28815521 DOI: 10.1007/978-981-10-4567-7_4] [Citation(s) in RCA: 93] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The execution of proper Ca2+ signaling requires close apposition between the endoplasmic reticulum (ER) and mitochondria. Hence, Ca2+ released from the ER is "quasi-synaptically" transferred to mitochondrial matrix, where Ca2+ stimulates mitochondrial ATP synthesis by activating the tricarboxylic acid (TCA) cycle. However, when the Ca2+ transfer is excessive and sustained, mitochondrial Ca2+ overload induces apoptosis by opening the mitochondrial permeability transition pore. A large number of regulatory proteins reside at mitochondria-associated ER membranes (MAMs) to maintain the optimal distance between the organelles and to coordinate the functionality of both ER and mitochondrial Ca2+ transporters or channels. In this chapter, we discuss the different pathways involved in the regulation of ER-mitochondria Ca2+ flux and describe the activities of the various Ca2+ players based on their primary intra-organelle localization.
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Affiliation(s)
- 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, Italy
| | - Mart Bittremieux
- Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine and Leuven Kanker Instituut, KU Leuven, Campus Gasthuisberg O&N-I box 802, Herestraat 49, B-3000, Leuven, Belgium
| | - Sonia Missiroli
- 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, Italy
| | - Claudia Morganti
- 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, Italy
| | - Simone Patergnani
- 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, Italy
| | - Luigi Sbano
- 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, Italy
| | - Alessandro Rimessi
- 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, Italy
| | - Martijn Kerkhofs
- Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine and Leuven Kanker Instituut, KU Leuven, Campus Gasthuisberg O&N-I box 802, Herestraat 49, B-3000, Leuven, Belgium
| | - Jan B Parys
- Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine and Leuven Kanker Instituut, KU Leuven, Campus Gasthuisberg O&N-I box 802, Herestraat 49, B-3000, Leuven, Belgium
| | - Geert Bultynck
- Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine and Leuven Kanker Instituut, KU Leuven, Campus Gasthuisberg O&N-I box 802, Herestraat 49, B-3000, Leuven, Belgium
| | - Carlotta Giorgi
- 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, 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, Italy.
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21
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Kerkhofs M, Giorgi C, Marchi S, Seitaj B, Parys JB, Pinton P, Bultynck G, Bittremieux M. Alterations in Ca 2+ Signalling via ER-Mitochondria Contact Site Remodelling in Cancer. Adv Exp Med Biol 2017; 997:225-254. [PMID: 28815534 DOI: 10.1007/978-981-10-4567-7_17] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Inter-organellar contact sites establish microdomains for localised Ca2+-signalling events. One of these microdomains is established between the ER and the mitochondria. Importantly, the so-called mitochondria-associated ER membranes (MAMs) contain, besides structural proteins and proteins involved in lipid exchange, several Ca2+-transport systems, mediating efficient Ca2+ transfer from the ER to the mitochondria. These Ca2+ signals critically control several mitochondrial functions, thereby impacting cell metabolism, cell death and survival, proliferation and migration. Hence, the MAMs have emerged as critical signalling hubs in physiology, while their dysregulation is an important factor that drives or at least contributes to oncogenesis and tumour progression. In this book chapter, we will provide an overview of the role of the MAMs in cell function and how alterations in the MAM composition contribute to oncogenic features and behaviours.
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Affiliation(s)
- Martijn Kerkhofs
- Laboratory Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine and Leuven Kanker Instituut (LKI), KU Leuven, Campus Gasthuisberg O&N 1 Box 802, Herestraat 49, 3000, Leuven, Belgium
| | - Carlotta Giorgi
- Laboratory for Technologies of Advanced Therapies (LTTA), Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, University of Ferrara, Ferrara, Italy
| | - Saverio Marchi
- Laboratory for Technologies of Advanced Therapies (LTTA), Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, University of Ferrara, Ferrara, Italy
| | - Bruno Seitaj
- Laboratory Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine and Leuven Kanker Instituut (LKI), KU Leuven, Campus Gasthuisberg O&N 1 Box 802, Herestraat 49, 3000, Leuven, Belgium
| | - Jan B Parys
- Laboratory Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine and Leuven Kanker Instituut (LKI), KU Leuven, Campus Gasthuisberg O&N 1 Box 802, Herestraat 49, 3000, Leuven, Belgium
| | - Paolo Pinton
- Laboratory for Technologies of Advanced Therapies (LTTA), Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, University of Ferrara, Ferrara, Italy
| | - Geert Bultynck
- Laboratory Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine and Leuven Kanker Instituut (LKI), KU Leuven, Campus Gasthuisberg O&N 1 Box 802, Herestraat 49, 3000, Leuven, Belgium.
| | - Mart Bittremieux
- Laboratory Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine and Leuven Kanker Instituut (LKI), KU Leuven, Campus Gasthuisberg O&N 1 Box 802, Herestraat 49, 3000, Leuven, Belgium
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22
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Devuyst S, Dutoit T, Stenuit P, Kerkhofs M. Automatic K-complexes detection in sleep EEG recordings using likelihood thresholds. Annu Int Conf IEEE Eng Med Biol Soc 2011; 2010:4658-61. [PMID: 21096240 DOI: 10.1109/iembs.2010.5626447] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In this paper, we present an automatic method for K-complexes detection based on features extraction and the use of fuzzy thresholds. The validity of our process was examined on the basis of two visual K-complexes scorings performed on 5 excerpts of 30 minutes. Results were investigated through all different sleep stages. The algorithm provides global true positive rates of 61.72% and 60.94%, respectively with scorer 1 and scorer 2. The false positive proportions (compared to the total number of visually scored K-complexes) are of 19.62% and 181.25%, while the false positive rates estimated on a one 1 second resolution are only of 0.53% and 1.53%. These results suggest that our approach is completely suitable since its performances are similar to those of the human scorers.
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Affiliation(s)
- S Devuyst
- TCTS Lab, Université de Mons - UMONS, B-7000, Belgium.
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Devuyst S, Dutoit T, Stenuit P, Kerkhofs M. Automatic sleep spindles detection--overview and development of a standard proposal assessment method. Annu Int Conf IEEE Eng Med Biol Soc 2011; 2011:1713-1716. [PMID: 22254656 DOI: 10.1109/iembs.2011.6090491] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Since the 1970s, various automatic sleep spindles procedures have been implemented and presented in the literature. Unfortunately, their results are not easily comparable because the databases, the assessment methods and the terminologies employed are often radically different. In this study, we propose a systematic assessment method for any automatic sleep spindles detection algorithm. We apply this assessment method to our own automatic detection process in order to illustrate and legitimate its use. We obtain a global sensitivity of 70.20%, for a false positive proportion (relative to the total number of visually scored sleep spindles) of only 26.44% (False positive rate = 1.38% and specificity = 98.62%).
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Affiliation(s)
- S Devuyst
- TCTS Lab, Université de Mons -UMONS, B-7000 Mons, Belgium.
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Devuyst S, Dutoit T, Stenuit P, Kerkhofs M, Stanus E. Removal of ECG artifacts from EEG using a modified independent component analysis approach. Annu Int Conf IEEE Eng Med Biol Soc 2009; 2008:5204-7. [PMID: 19163890 DOI: 10.1109/iembs.2008.4650387] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
In this paper, we introduce a new automatic method for electrocardiogram (ECG) artifact elimination from the electroencephalogram (EEG) or the electrooculogram (EOG). It is based on a modification of the independent component analysis (ICA) algorithm which gives promising results while only using a single-channel EEG (or EOG) and the ECG. To check the effectiveness of our approach, we compared its correction rate with those obtained by ensemble average subtraction (EAS) and adaptive filtering (AF). For this purpose, we applied these algorithms to 10 excerpts of polysomnographic sleep recordings containing ECG artifacts and other typical artifacts (e.g. movement, sweat, respiration, etc.). Two hundred successive interference peaks were examined in each excerpt to compute correction rates. We found that our modified ICA was the most robust to various waveforms of cardiac interference and to the presence of others artifacts, with a correction rate of 91.0%, against 83.5% for EAS and 83.1% for AF.
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Affiliation(s)
- S Devuyst
- TCTS Lab, Faculté Polytechnique de Mons, B-7000, Belgium.
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25
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Devuyst S, Dutoit T, Didier JF, Meers F, Stanus E, Stenuit P, Kerkhofs M. Automatic sleep spindle detection in patients with sleep disorders. Conf Proc IEEE Eng Med Biol Soc 2008; 2006:3883-6. [PMID: 17947058 DOI: 10.1109/iembs.2006.259298] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
In this paper, we present a new automatic method for sleep spindle detection. It consist of a generalisation of the Schimicek's method that takes more types of artefacts into account and uses variable thresholds regarding the statistical properties of the signal. Validity of our process is examined on the basis of visual spindle scoring performed by an expert. Results obtained are compared to those obtained by Schimicek's method. For a specificity of 90%, we obtain a sensitivity of 76.9% while Schimicek's method has a sensitivity of 70.4%. Moreover an increase of the area under the ROC curve is observed and confirms that the detection process is improved.
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Affiliation(s)
- S Devuyst
- Fac. Polytech. de Mons, TCTS Lab., Mons., Belgium.
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26
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Dyzma M, Zouaoui Boudjeltia K, Esposito M, Vanhaeverbeek M, Kerkhofs M. PO9-214 NEUROPEPTIDE Y REDUCES THE IL-8 RELEASE IN ENDOTHELIAL CELLS INDUCED BY TNF-A. ATHEROSCLEROSIS SUPP 2007. [DOI: 10.1016/s1567-5688(07)71224-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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27
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Abstract
Frédéric Bremer was one of the pioneer neurophysiologists who dedicated their career to understanding the neural mechanisms involved in the control of sleep-wake regulation. This paper follows his career and his major achievements. We found that Bremer's interest in sleep resulted from his unexpected observations after transecting the brain at the midcollicular level in the "encéphale isolé" preparation. The sleep-like behaviour of the animal, accompanied by slow waves in the cortex, convinced him that sleep resulted from cortical deafferentation. He was further convinced that deafferentation was the cause of sleep when he found that transecting the brain at the medullary level did not much affect the sleep-wake cycle. As we show, Bremer's views that sleep is a passive phenomenon imposed on the brain because of deafferentation was shared by most of his contemporaries. Years later Bremer admitted that he interpreted his experimental findings wrongly. He continued to investigate sleep using his preparations and made important contributions to understanding the relationships between the brainstem reticular formation and the basal forebrain hypnogenic centres, as well as the importance of light on these relationships.
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Affiliation(s)
- M Kerkhofs
- Sleep Laboratory, CHU A. Vésale, Université Libre de Bruxelles, Montigny-le-Tilleul 6110, Belgium
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28
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Loza S, Boudjeltia KZ, Kerkhofs M. L0005 Sleepiness complaints and sleep apnea and hypopnea in egyptian patients. Sleep Med 2007. [DOI: 10.1016/s1389-9457(07)70375-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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29
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Zouaoui Boudjeltia K, Stenuit P, Esposito MJ, Guillaume M, Brohee D, Cauchie P, Vanhaeverbeek M, Kerkhofs M. Mo-P5:336 Sleep restriction increases white blood cells-mainly neutrophils counts in young healthy men. ATHEROSCLEROSIS SUPP 2006. [DOI: 10.1016/s1567-5688(06)80468-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Van Meerhaeghe A, Delpire P, Stenuit P, Kerkhofs M. Operating characteristics of the negative expiratory pressure technique in predicting obstructive sleep apnoea syndrome in snoring patients. Thorax 2004; 59:883-8. [PMID: 15454655 PMCID: PMC1746827 DOI: 10.1136/thx.2003.015271] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND This study examines the operating characteristics of the expiratory flow response to a negative pressure (NEP) applied to the mouth in the prediction of obstructive sleep apnoea syndrome (OSAS) in snoring patients. METHODS Two hundred and thirty eight patients with normal spirometric values were studied. Full laboratory polysomnography was performed and an NEP of -5 cm H(2)O was applied in the sitting and supine positions. RESULTS A significant correlation was found between the degree of flow limitation measured by NEP in both positions (expressed as the percentage of the expired tidal volume over which NEP induced flow did not exceed spontaneous flow) and the apnoea-hypopnoea index (AHI). This correlation was significantly higher in the supine position (p<0.0001) where an expiratory flow limitation cut off value of >/=27.5% of the tidal volume produced a sensitivity of 81.9% and a specificity of 69.1% in predicting OSAS. CONCLUSION These findings show that the degree of instability of the upper airway measured by NEP is correlated with the severity of OSAS. NEP had moderate sensitivity and specificity and may be useful in predicting OSAS in a clinic based population.
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Affiliation(s)
- A Van Meerhaeghe
- Service de Pneumologie, CHU de Charleroi, Hôpital André Vésale, 706 route de Gozée, Montigny-le-Tilleul, 6610 Belgium.
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32
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Van Meerhaeghe A, Doucet J, Moscariello A, Van Haeverbeek M, Kerkhofs M. 44 Effet de la perte de poids sur le syndrome d’apnées. Rev Mal Respir 2004. [DOI: 10.1016/s0761-8425(04)71670-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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33
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Kerkhofs M. [Frederic Bremer (1892-1982): a pioneer in sleep research]. Rev Med Brux 2003; 24:A183-6. [PMID: 12891886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/21/2023]
Affiliation(s)
- M Kerkhofs
- Laboratoire de Sommeil, C.H.U. de Charleroi, Site André Vésale, Montigny-le-Tilleul
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34
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Noseda A, Nouvelle M, Lanquart JR, Kempenaers C, De Maertelaer V, Linkowski R, Kerkhofs M. High leg motor activity in sleep apnea hypopnea patients: efficacy of clonazepam combined with nasal CPAP on polysomnographic variables. Respir Med 2002; 96:693-9. [PMID: 12243315 DOI: 10.1053/rmed.2002.1333] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The association of sleep apnea hypopnea syndrome (SAHS) with high leg activity in the same patient is a dilemma for the physician, as clonazepam, used to treat periodic leg movement syndrome (PLMS) can aggravate apneas, while nasal continuous positive airway pressure (nCPAP) can exacerbate PLMS. The present study aimed to compare nCPAP alone (n), nCPAP combined with clonazepam (n+c) and clonazepam alone (c) in patients with mild to moderate SAHS associated with high leg activity. Fourteen patients with an apnea hypopnea index (AHI) between 10 and 50 h(-1) and a leg movement index with regard to time in bed [LMI (TIB)] > 15 h(-1) on baseline polysomnography (b) were recorded on three consecutive nights with n, n+c and c, respectively. Leg movements were detected, using actigraphy, and were subsequently categorized into periodic, apnea- or hypopnea-related and nonperiodic movements (defined as neither periodic nor related to a respiratory event). The three treatments were successful in improving breathing [AHI b 26.1 (3.2) n 11.8 (2.4) n+c 5.0 (0.7) c 14.9 (1.8) h(-1)], leg activity [LMI (TIB) b 391 (4.8) n 22.5 (4.4) n+c 23.9 (3.9) c 22.6 (3.7) h(-1)] and sleep fragmentation [stage shift index b 373 (2.6) n 28.6 (1.6) n+c 25.6 (1.8) c 26.6 (1.6) h(-1)]. All types of movements were reduced, the effect being significant for respiratory events related and nonperiodic movements. Combination therapy was more effective than nCPAP alone in reducing the AHI and in improving sleep efficiency. We conclude that in patients with mild to moderate SASH associated with high leg activity, nCPAP improves nocturnal breathing and clonazepam reduces leg activity. More unexpectedly nCPAP is beneficial on leg activity and clonazepam on breathing, probably through a decrease in sleep fragmentation. The best results are obtained with combination therapy.
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Affiliation(s)
- A Noseda
- Chest Department, Hĵpital Erasme, Brussels, Belgium.
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35
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Shochat T, Hadas N, Kerkhofs M, Herchuelz A, Penzel T, Peter JH, Lavie P. The SleepStrip: an apnoea screener for the early detection of sleep apnoea syndrome. Eur Respir J 2002; 19:121-6. [PMID: 11843310 DOI: 10.1183/09031936.02.00227302] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Sleep apnoea svndrome (SAS) is a largely undiagnosed and prevalent disorder. It is associated with cardiovascular morbidity as well as excessive daytime sleepiness and poor quality of life. In the present study the SleepStrip, a novel screening device is introduced, which is low cost and easy to use and is aimed for widespread use. The results of three independent validation studies, which compared the SleepStrip score (Sscore) against "gold standard" polysomnographically-determined apnoea/ hypopnoea index (AHI), are reported both separately and combined. Four hundred and two patients suspected of SAS underwent full polysomnography recordings concomitantly with the use of the SleepStrip. For all samples combined, the correlation between AHI and Sscore was r=0.73, sensitivity and specificity values ranged from 80-86% and 57-86% respectively, and the area under the curve derived from receiver-operating characteristic curves ranged from 0.81-0.92 at varying AHI thresholds. Though not intended as a substitute for polysomnography, the SleepStrip may provide initial screening information, which may be useful in both clinical and experimental settings.
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Affiliation(s)
- T Shochat
- Scientific Laboratory Products, Ltd, Tel Aviv, Israel
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36
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Noseda A, Jann E, Hoffmann G, Linkowski P, Kerkhofs M. Compliance with nasal continuous positive airway pressure assessed with a pressure monitor: pattern of use and influence of sleep habits. Respir Med 2000; 94:76-81. [PMID: 10714483 DOI: 10.1053/rmed.1999.0671] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The aim of the study was to assess compliance with nasal continuous positive airway pressure (N-CPAP) at home in patients with obstructive sleep apnoea syndrome (OSAS) and to search for predictors of compliance. We studied a cohort of 106 consecutive patients (91 men, 15 women) with a median apnoea hypopnoea index of 62.4 (range 21-132) h(-1), equipped at home with a Rem+ Soft device (Sefam, France), including a pressure monitor and a real-time clock. During the third and fourth months of treatment, the patients used their machine a median of 88% of days (16-100%), with a mean effective use of 5.6 (1.3-11.2) h per effective day. Residual apnoea index on N-CPAP, as recorded by the monitor, was 1.5 (0.3-27.6) h(-1). Mean clock-time for starting with N-CPAP was 23 h 54 min (21 h 34-01 h 42). The mean effective use per effective day correlated negatively with the minimal (and the mean) level of oxyhaemoglobin saturation (r(s) = -0.24, P < 0.05) while the percentage of days the machine was used correlated negatively with the percentage of slow wave sleep (r(s) = -0.22, P < 0.05) at baseline polysomnography. In a subset of 30 subjects, earlier start on N-CPAP correlated with longer use of the device in 22 patients (median r--0.48). We conclude that a pressure monitor allows reporting on compliance in terms of regularity (% of days the machine is used) and length of sleep on N-CPAP (effective use per effective day). These compliance variables show modest correlations with baseline polysomnographic features. Late bedtime should be discouraged as it might decrease compliance.
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Affiliation(s)
- A Noseda
- Chest Clinics, Hôpitaux Erasme et Brugmann, Université Libre de Bruxelles, Brussels, Belgium
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37
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Mendlewicz J, Linkowski P, Kerkhofs M, Leproult R, Copinschi G, Van Cauter E. Genetic control of 24-hour growth hormone secretion in man: a twin study. J Clin Endocrinol Metab 1999; 84:856-62. [PMID: 10084561 DOI: 10.1210/jcem.84.3.5525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
The aim of this study was to delineate the contributions of genetic and environmental factors in the regulation of the 24-h GH secretion. The 24-h profile of plasma GH was obtained at 15-min intervals in 10 pairs of monozygotic and 9 pairs of dizygotic normal male twins, aged 16-34 yr. Sleep was polygraphically monitored. Significant pulses of GH secretion were identified using a modification of the computer algorithm ULTRA. For each significant pulse, the amount of GH secreted was calculated by deconvolution. A procedure specially developed for twin studies was used to partition the variance of investigated parameters into genetic and environmental contributions. A major genetic effect was evidenced on GH secretion during wakefulness (with a heritability estimate of 0.74) and, to a lesser extent, on the 24-h GH secretion. Significant genetic influences were also identified for slow wave sleep and height. These data demonstrate that human GH secretion in young adulthood is markedly dependent on genetic factors.
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Affiliation(s)
- J Mendlewicz
- Department of Psychiatry, Erasme Hospital, Université Libre de Bruxelles, Brussels, Belgium.
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38
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Stefos G, Staner L, Kerkhofs M, Hubain P, Mendlewicz J, Linkowski P. Shortened REM latency as a psychobiological marker for psychotic depression? An age-, gender-, and polarity-controlled study. Biol Psychiatry 1998; 44:1314-20. [PMID: 9861474 DOI: 10.1016/s0006-3223(98)00009-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND Previous reports suggest that the clinical dichotomy separating psychotic and nonpsychotic depression corresponds to different neurobiological profiles. The aim of the present study is to further investigate the psychobiological correlates of these two particular depressive subtypes. METHODS Thyroid-stimulating hormone response to thyrotropin-releasing hormone postdexamethasone cortisol levels, and electroencephalgraphic sleep characteristics of 44 psychotic major depressive patients were compared to those of 44 nonpsychotic depressives matched for age, gender, and polarity. RESULTS Some biological disturbances usually associated with depression (increased wakefulness, diminished rapid eye movement latency, hypercortisolism, blunted thyroid-stimulating hormone response to thyrotropin-releasing hormone stimulation) seemed to be significantly more pronounced in the psychotic depressed group as a reflection of greater illness severity; however, shortened REM latency was not influenced by severity and seemed to be more specifically related to the co-occurrence of psychotic and depressive symptoms. CONCLUSIONS Our data provide further support for the validity of the clinical dichotomy separating psychotic and nonpsychotic major depression independently of severity.
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Affiliation(s)
- G Stefos
- Department of Psychiatry, CHU Saint-Pierre Brussels, Belgium
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39
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Fossion P, Staner L, Dramaix M, Kempenaers C, Kerkhofs M, Hubain P, Verbanck P, Mendlewicz J, Linkowski P. Does sleep EEG data distinguish between UP, BPI or BPII major depressions? An age and gender controlled study. J Affect Disord 1998; 49:181-7. [PMID: 9629947 DOI: 10.1016/s0165-0327(97)00111-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Clinical characteristics and sleep EEG data of 14 unipolar (UPR), 14 bipolar I (BPI) and 14 bipolar II (BPII) patients, matched for age and gender, were investigated during a major depressive episode. We observed a remarkable similarity in the clinical characteristics of the three samples and, concerning sleep EEG data, a trend to a higher percentage of awakening among BPI patients. Pairwise comparisons of the three subgroups showed that only the Newcastle rating scale score reached significant difference between BPI and UPR groups. We observed trends regarding the difference of awakening both between BPI and BPII groups and between BPI and UPR groups, difference of percentage of REM sleep between BPI and BPII groups and difference of Sleep Period Time between BPII and UPR groups. We also observed that the distribution of REM latencies in the BPI subgroup was different from the two others.
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Affiliation(s)
- P Fossion
- Institute of Psychiatry and Medical Psychology, University Hospital Brugmann, Brussels, Belgium
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40
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Linkowski P, Spiegel K, Kerkhofs M, L'Hermite-Balériaux M, Van Onderbergen A, Leproult R, Mendlewicz J, Van Cauter E. Genetic and environmental influences on prolactin secretion during wake and during sleep. Am J Physiol 1998; 274:E909-19. [PMID: 9612250 DOI: 10.1152/ajpendo.1998.274.5.e909] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
To delineate the contributions of genetic and environmental factors in the regulation of human prolactin (PRL) secretion, the 24-h profile of plasma PRL was obtained at 15-min intervals in 10 pairs of monozygotic and 10 pairs of dizygotic twins. Sleep was monitored polygraphically. PRL secretory rates were derived from plasma concentrations by deconvolution. Diurnal (24-h) variations were quantified by a regression curve to define nadir, acrophase, and amplitude. Pulses of PRL secretion were identified using a computerized algorithm. A procedure specifically developed for twin studies was used to partition the variance into genetic and environmental contributions. Significant genetic effects were identified for daytime PRL concentrations, rhythm amplitude, and overall wave-shape of the daily PRL profile. In contrast, environmental effects were dominant for mean concentrations during sleep, total secretory output during sleep, overall 24-h concentrations, and total 24-h secretion. However, when interindividual variations in sleep fragmentation were taken into account, the estimates of genetic variance for PRL concentrations and secretion during sleep approached statistical significance. Significant genetic influences were identified for slow-wave sleep (SWS). Because SWS is associated with increased nocturnal PRL secretion, it is possible that genetic effects on PRL secretion during sleep reflect genetic influences on SWS. In conclusion, genetic factors determine partially both the basal daytime concentrations of PRL and the temporal organization of PRL secretion over the 24-h cycle in normal young men.
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Affiliation(s)
- P Linkowski
- Department of Psychiatry, Erasme Hospital, Brussels, Belgium
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41
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Moreno-Reyes R, Kerkhofs M, L'Hermite-Balériaux M, Thorner MO, Van Cauter E, Copinschi G. Evidence against a role for the growth hormone-releasing peptide axis in human slow-wave sleep regulation. Am J Physiol 1998; 274:E779-84. [PMID: 9612233 DOI: 10.1152/ajpendo.1998.274.5.e779] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A complex interrelationship exists between sleep and somatotropic activity. In humans, intravenous injections of growth hormone-releasing hormone (GHRH) given during sleep consistently stimulate slow-wave (SW) sleep, particularly when given in the latter part of the night. In the present study, the possible somnogenic effects induced under similar conditions by GH-releasing peptide (GHRP) were investigated in seven young healthy men. Bolus intravenous injections of GHRP-2 (1 microgram/kg body wt) or saline, in randomized order, were given after 60 s of the third rapid-eye-movement period. All GHRP injections were immediately followed by transient prolactin elevations and by GH pulses of a magnitude within or around the upper limit of the physiological range. Except for a nonsignificant tendency to increased amounts of wakefulness during the 1st h after the injection, no effects of GHRP-2 administration on sleep were detected. There was in particular no enhancement of SW sleep. Thus, in contrast to GHRH, late-night single injections of GHRP-2 at a dosage resulting in similar GH elevations have no stimulatory effects on SW sleep. The present data provide evidence against the involvement of the GHRP axis in human SW sleep regulation.
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Affiliation(s)
- R Moreno-Reyes
- Department of Endocrinology, Hôpital Erasme, Université Libre de Bruxelles, Belgium
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42
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Hubain PP, Staner L, Dramaix M, Kerkhofs M, Papadimitriou G, Mendlewicz J, Linkowski P. The dexamethasone suppression test and sleep electroencephalogram in nonbipolar major depressed inpatients: a multivariate analysis. Biol Psychiatry 1998; 43:220-9. [PMID: 9494704 DOI: 10.1016/s0006-3223(97)80434-9] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND The present study further examined relationships between postdexamethasone cortisol plasma values and sleep electroencephalogram (EEG) parameters. METHODS The dexamethasone suppression test (DST) and polysomnographic recordings were performed in a sample of 300 inpatients with primary major depressive disorder (MDD) (102 men and 198 women, mean age 44 +/- 12 years, range 20-74 years) consecutively admitted to Erasme Hospital (Brussels, Belgium) between 1981 and 1992. RESULTS The DST was abnormal in 40% of the sample. Postdexamethasone cortisol plasma values at 4:00 PM were significantly influenced by age, but not by gender. They were also significantly and positively correlated with weight loss, total scores on the Hamilton Depression Rating Scale, total scores on the Newcastle Scale, percentage of awakenings during sleep, and percent of stage 1. They were significantly and negatively correlated with percent of stage 2, slow-wave sleep, and REM sleep. Multiple regression analyses were conducted in two successive steps. First among clinical variables, only age and depressive symptom severity remained correlated with postdexamethasone plasma cortisol values. In the second step, with age and severity held constant, postdexamethasone plasma cortisol values were positively associated with amount of wake time and stage 1, and negatively with amount of slow-wave sleep. CONCLUSIONS These findings provide further indirect support for an overarousal state in MDD with sympathoadrenal system hyperactivity and impaired sleep continuity. They also underline the importance of taking into account various clinical confounding factors in the interpretation of both DST and sleep EEG results.
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Affiliation(s)
- P P Hubain
- Department of Psychiatry, Erasme Hospital, University of Brussels, Belgium
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43
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Abstract
Several sleep complaints and disturbances have been documented in psychiatric disorders. These modifications of sleep in anxiety disorders, alcoholism, schizophrenia, dementia and eating disorders are reviewed and discussed. At the present time, there is no evidence for any specific sleep pattern in non-affective psychiatric disorders. The co-morbidity of sleep disorders like sleep apnoea, periodic leg movements and parasomnia in psychiatric illness is not very well known at the present time.
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Affiliation(s)
- M Kerkhofs
- Sleep Laboratory, Erasme Hospital, Université Libre de Bruxelles, Route de Lennik 808, 1070 Brussels, Belgium
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44
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Abstract
We focus on aspects of health changes, the importance of cohort effects, age related health changes and the effect of labour market status and work history on health. We moreover assess the relative importance of gradual changes and sudden shocks in health changes and the role of work status on the likelihood of experiencing a health shock. A fixed effect panel data model is estimated on two waves of a survey of Dutch elderly. We find strong differences in health outcomes for different age cohorts and gender. We also find that health deteriorates with employment and labour market history.
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Affiliation(s)
- M Kerkhofs
- CERRA, Department of Economics, Leiden University, The Netherlands
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45
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Noseda A, Kempenaers C, Hoffmann G, Kerkhofs M, Le Bon O, Linkowski P, Jann E, Schmerber J, Yernault JC. [Sleep apnea and nocturnal ventilatory assistance (nCPAP): 5-year experience in the conventional system]. Rev Med Brux 1997; 18:64-69. [PMID: 9221464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The reimbursement of nasal continuous positive airway pressure (nCPAP) by the Belgian social security, via a conventional system, has made since 1991 this treatment available to an increasing number of patients having moderate to severe sleep apnoea hypopnoea syndrome (SAHS). We have reviewed our experience in prescribing domiciliary nCPAP from 1991 to 1995. Three hundred twenty-five subjects with SAHS, predominantly male (89%) and/or obese (77%) subjects, have benefited. Mean use of nCPAP machine, assessed by reading the time counter, amounted 4.7 h per 24 h, with only 23% of non-compliant patients (use < 3 h per 24 h). In 205 patients nCPAP was effective in controlling SAHS-related symptoms. Cure, with successful weaning from nCPAP, was obtained in 16 patients, as a result of marked weight loss in 13 of them. Forty-six non-compliant subjects were not allowed by the physician to go on, and 40 subjects left nCPAP because of intolerance. Finally, 10 patients abandoned nCPAP because of inefficacy, ascribed to some associated condition, being predominant, and 8 patients died. Our results suggest that domiciliary nCPAP is an effective treatment for SAHS in a majority of subjects, but that this kind of treatment is prescribed lifelong, unless there is a marked weight loss. The Belgian conventional system, as it requires a regular follow-up, contributes to keep non-compliance within acceptable limits.
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Affiliation(s)
- A Noseda
- Service de Pneumologie, Hôpital Erasme, Bruxelles
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46
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Noseda A, Kempenaers C, Kerkhofs M, Houben JJ, Linkowski P. Sleep apnea after 1 year domiciliary nasal-continuous positive airway pressure and attempted weight reduction. Potential for weaning from continuous positive airway pressure. Chest 1996; 109:138-43. [PMID: 8549176 DOI: 10.1378/chest.109.1.138] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
STUDY OBJECTIVE To assess the effect of 1 year of therapy for sleep apnea syndrome (SAS) combining domiciliary nasal-continuous positive airway pressure (N-CPAP) and attempted weight loss on the severity of disease and to evaluate the potential for weaning from continuous positive airway pressure (CPAP). METHODS AND PROCEDURES Ninety-five patients having a baseline apnea hypopnea index (AHI) greater than 10/h were prescribed N-CPAP at home. Weight loss was attempted by dietary counseling and by single ring vertical gastroplasty in those patients with a body mass index (BMI) greater than 40 kg/m2. Subjects were asked to return after 1 year for a full-night polysomnography (PSG) without CPAP and the results were compared with baseline PSG. RESULTS Thirty-nine patients compliant to CPAP were evaluated. Weight had decreased from 108.3 +/- 29.0 to 99.7 +/- 17.7 kg as a result of dietary counseling (n = 36) or gastroplasty (n = 3). A significant improvement was found in AHI (66.5 +/- 28.7-->50.3 +/- 38.4/h; p < 0.05), maximal duration of apnea or hypopnea (66 +/- 22-->47 +/- 18 s; p < 0.001), minimal oxyhemoglobin saturation (62 +/- 16-->78 +/- 7%; p < 0.001), and stage shift index (SSI) (76 +/- 29-->62 +/- 28/h; p < 0.05). The drop in AHI correlated with the reduction in BMI (r = 0.47; p < 0.01) and with the decrease in SSI (r = 0.50; p < 0.001). Weaning from CPAP was proposed to six patients and succeeded in four (three with 29, 93, and 94 kg weight loss, respectively, and one subject with a normal unchanged weight). CONCLUSION In 39 patients with SAS, 1-year domiciliary N-CPAP combined with weight loss resulted in a significant improvement in breathing during sleep and in sleep fragmentation, as judged from PSG without CPAP. Four subjects were successfully weaned, three of whom had in parallel a substantial decrease in weight.
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Affiliation(s)
- A Noseda
- Chest Department, Hôpital Erasme, Université Libre de Bruxelles, Brussels, Belgium
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47
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Lanquart JP, Kerkhofs M, Stanus E, Mendlewicz J, Linkowski P. Sleep EEG analysis by linear prediction: frequency changes of slow-wave activity within NREM and REM sleep episodes in healthy men. Neuropsychobiology 1996; 34:1-8. [PMID: 8884751 DOI: 10.1159/000119282] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The linear prediction method was applied to obtain a power spectra estimate of sleep EEG in 10 healthy young men. In order to analyze frequency changes of the slow-wave activity (EEG power in the delta band, 0.05-2.88 Hz), the delta mean frequency was computed for each 20-second sleep epoch. A mean delta mean frequency was calculated for each sleep stage in each individual. Our observations indicate that the delta mean frequency decreases during NREM periods and increases mainly at the onset of the REM episodes. This finding, in parallel with the detailed analysis of slow-wave power variations, leads to an additional description of sleep characteristics during transitions between the NREM-REM sleep episodes.
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Affiliation(s)
- J P Lanquart
- Department of Psychiatry, Erasme Hospital, Free University of Brussels, Belgium
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48
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Staner L, Kerkhofs M, Detroux D, Leyman S, Linkowski P, Mendlewicz J. Acute, subchronic and withdrawal sleep EEG changes during treatment with paroxetine and amitriptyline: a double-blind randomized trial in major depression. Sleep 1995; 18:470-7. [PMID: 7481419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Paroxetine (30 mg), a selective serotonin (5-HT) reuptake inhibitor, was compared in a double-blind trial to amitriptyline (150 mg) in a sample of 40 inpatients aged 18-65 years who fulfilled Research Diagnostic Criteria for major depression. Patients were studied after a placebo drug washout period of 10 days and after an active 4-week treatment period. Sleep EEG recordings were performed before and at the end of the study as well as during acute treatment (first 2 days) and following withdrawal of active medication. Paroxetine shows an antidepressant effect similar to amitriptyline with a different side-effect profile typical of 5-HT reuptake inhibition. Paroxetine and amitriptyline decreased the amount of REM sleep, a well-known effect of classical antidepressants. Paroxetine also shared with other 5-HT reuptake inhibitors an alerting effect on sleep that was not shown to be detrimental on subjective sleep quality.
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Affiliation(s)
- L Staner
- Department of Psychiatry, Erasme Hospital, Free University of Brussels, Belgium
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49
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Hubain PP, Souery D, Jönck L, Staner L, Van Veeren C, Kerkhofs M, Mendlewicz J, Linkowski P. Relationship between the Newcastle scale and sleep polysomnographic variables in major depression: a controlled study. Eur Neuropsychopharmacol 1995; 5:129-34. [PMID: 7549455 DOI: 10.1016/0924-977x(95)00011-d] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
In order to investigate the reliability of the endogenous concept of depressive illness with some sleep EEG parameters, we studied 39 male inpatients suffering from a nonbipolar major depressive episode (15 endogenous (MDDE) and 24 nonendogenous (MDDNE)) and 20 age and sex matched normal controls (C). All patients were diagnosed according to the Research Diagnostic Criteria (RDC) and the endogenous character of the episode was assessed with the Newcastle Endogenous Depression Diagnostic Index. We found significant differences for the following variables between the three groups (MDDE, MDDNE and C): sleep period time (SPT), REM latency, stage II, slow wave sleep (SWS), REM latency expressed as a continuous variable and REM latency expressed as a dichotomizing variable with a threshold of 50 min. These variables were used to compare the endogenous and the nonendogenous depressed patients and also the major depressed patients and the normal controls. Significant differences were observed between all depressed patients and control subjects for amount of SWS and REM latency which were both reduced in endogenous and nonendogenous depressed patients. No significant difference was observed between endogenous and nonendogenous depressed patients, except for the REM latency expressed with a threshold of 50 min (more frequently observed in endogenous depressed patients). Our data support the observation that SWS and REM latency are decreased in major depressive patients. However, in this age and sex controlled study, subtyping nonbipolar major depressive disorder for an endogenous character by the Newcastle Endogenous Depression Diagnostic Index (NEDDI) did not reveal further significant differences for sleep EEG variables, except for the shortening of the REM latency expressed as a dichotomizing variable.
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Affiliation(s)
- P P Hubain
- Department of Psychiatry, Erasme Hospital, University of Brussels, Belgium
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50
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Abstract
The use of subjective health measures in empirical models of labour supply and retirement decisions has frequently been criticized. Responses to questions concerning health may be biased due to financial incentives and the willingness to conform to social rules. The eligibility conditions for some social security allowances, notably Disability Insurance benefits, are contingent upon bad health. Even if the decision to apply for a disability allowance is to some extent motivated by financial considerations or a relatively strong preference for leisure, respondents will be inclined to play down these motives and emphasize the importance of their health condition. As a consequence, reporting errors may depend on the labour market status of the respondent and self-reported health variables will be endogenous in labour supply and retirement models. The objective of this paper is to assess the importance of state dependent reporting errors in survey responses and to propose and estimate a model that can be used to account for this kind of systematic mis-reporting. The estimation results indicate that among respondents receiving Disability Allowance, reporting errors are large and systematic. Using such subjective health measures in retirement models may therefore seriously bias the parameter estimates and the conclusions drawn from these.
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Affiliation(s)
- M Kerkhofs
- Department of Economics, Leiden University, The Netherlands
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