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Vandebrouck C, Ferreira T. Glued in lipids: Lipointoxication in cystic fibrosis. EBioMedicine 2020; 61:103038. [PMID: 33038767 PMCID: PMC7648119 DOI: 10.1016/j.ebiom.2020.103038] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 07/27/2020] [Accepted: 09/14/2020] [Indexed: 01/14/2023] Open
Abstract
Cystic Fibrosis (CF) is an autosomal recessive disease caused by mutations in the CF transmembrane regulator (CFTR) gene, which encodes a chloride channel located at the apical surface of epithelial cells. Unsaturated Fatty Acid (UFA) deficiency has been a persistent observation in tissues from patients with CF. However, the impacts of such deficiencies on the etiology of the disease have been the object of intense debates. The aim of the present review is first to highlight the general consensus on fatty acid dysregulations that emerges from, sometimes apparently contradictory, studies. In a second step, a unifying mechanism for the potential impacts of these fatty acid dysregulations in CF cells, based on alterations of membrane biophysical properties (known as lipointoxication), is proposed. Finally, the contribution of lipointoxication to the progression of the CF disease and how it could affect the efficacy of current treatments is also discussed.
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Affiliation(s)
- Clarisse Vandebrouck
- Laboratoire "Lipointoxication and Channelopathies (LiTch) - ConicMeds", Université de Poitiers, 1, rue Georges Bonnet, Poitiers, France; Laboratoire "Signalisation et Transports Ioniques Membranaires (STIM; EA 7349)", Université de Poitiers, 1, rue Georges Bonnet, Poitiers, France
| | - Thierry Ferreira
- Laboratoire "Lipointoxication and Channelopathies (LiTch) - ConicMeds", Université de Poitiers, 1, rue Georges Bonnet, Poitiers, France.
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Gautier R, Bacle A, Tiberti ML, Fuchs PF, Vanni S, Antonny B. PackMem: A Versatile Tool to Compute and Visualize Interfacial Packing Defects in Lipid Bilayers. Biophys J 2018; 115:436-444. [PMID: 30055754 DOI: 10.1016/j.bpj.2018.06.025] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Revised: 06/15/2018] [Accepted: 06/26/2018] [Indexed: 11/18/2022] Open
Abstract
The analysis of the structural organization of lipid bilayers is generally performed across the direction normal to the bilayer/water interface, whereas the surface properties of the bilayer at the interface with water are often neglected. Here, we present PackMem, a bioinformatic tool that performs a topographic analysis of the bilayer surface from various molecular dynamics simulations. PackMem unifies and rationalizes previous analyses based on a Cartesian grid. The grid allows identification of surface regions defined as lipid-packing defects where lipids are loosely packed, leading to cavities in which aliphatic carbons are exposed to the solvent, either deep inside or close to the membrane surface. Examples are provided to show that the abundance of lipid-packing defects varies according to the temperature and to the bilayer composition. Because lipid-packing defects control the adsorption of peripheral proteins with hydrophobic insertions, PackMem is instrumental for us to understand and quantify the adhesive properties of biological membranes as well as their response to mechanical perturbations such as membrane deformation.
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Affiliation(s)
- Romain Gautier
- Université Côte d'Azur, CNRS, IPMC, Sophia-Antipolis, France.
| | - Amélie Bacle
- Institut Jacques Monod, CNRS Université Paris-Diderot, Sorbonne Paris Cité, Paris, France
| | | | - Patrick F Fuchs
- Institut Jacques Monod, CNRS Université Paris-Diderot, Sorbonne Paris Cité, Paris, France; Laboratoire des biomolécules, Sorbonne Université, École normale supérieure, PSL University, CNRS, Paris, France
| | - Stefano Vanni
- Université Côte d'Azur, CNRS, IPMC, Sophia-Antipolis, France; Department of Biology, University of Fribourg, Fribourg, Switzerland
| | - Bruno Antonny
- Université Côte d'Azur, CNRS, IPMC, Sophia-Antipolis, France
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Kadri L, Ferru-Clément R, Bacle A, Payet LA, Cantereau A, Hélye R, Becq F, Jayle C, Vandebrouck C, Ferreira T. Modulation of cellular membrane properties as a potential therapeutic strategy to counter lipointoxication in obstructive pulmonary diseases. Biochim Biophys Acta Mol Basis Dis 2018; 1864:3069-3084. [PMID: 29960042 DOI: 10.1016/j.bbadis.2018.06.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Revised: 06/04/2018] [Accepted: 06/25/2018] [Indexed: 02/08/2023]
Abstract
Maintaining the equilibrium between saturated and unsaturated fatty acids within membrane phospholipids (PLs) is crucial to sustain the optimal membrane biophysical properties, compatible with selective organelle-based processes. Lipointoxication is a pathological condition under which saturated PLs tend to accumulate within the cell at the expense of unsaturated species, with major impacts on organelle function. Here, we show that human bronchial epithelial cells extracted from lungs of patients with Obstructive Pulmonary Diseases (OPDs), i. e. Cystic Fibrosis (CF) individuals and Smokers, display a characteristic lipointoxication signature, with excessive amounts of saturated PLs. Reconstitution of this signature in cellulo and in silico revealed that such an imbalance results in altered membrane properties and in a dramatic disorganization of the intracellular network of bronchial epithelial cells, in a process which can account for several OPD traits. Such features include Endoplasmic Reticulum-stress, constitutive IL8 secretion, bronchoconstriction and, ultimately, epithelial cell death by apoptosis. We also demonstrate that a recently-identified lipid-like molecule, which has been shown to behave as a "membrane-reshaper", counters all the lipointoxication hallmarks tested. Altogether, these insights highlight the modulation of membrane properties as a potential new strategy to heal and prevent highly detrimental symptoms associated with OPDs.
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Affiliation(s)
- Linette Kadri
- Laboratoire Coopératif "Lipotoxicity and Channelopathies - ConicMeds", Université de Poitiers, 1, rue Georges Bonnet, Poitiers, France
| | - Romain Ferru-Clément
- Laboratoire Coopératif "Lipotoxicity and Channelopathies - ConicMeds", Université de Poitiers, 1, rue Georges Bonnet, Poitiers, France
| | - Amélie Bacle
- Laboratoire Coopératif "Lipotoxicity and Channelopathies - ConicMeds", Université de Poitiers, 1, rue Georges Bonnet, Poitiers, France
| | - Laurie-Anne Payet
- Laboratoire "Signalisation et Transports Ioniques Membranaires (STIM)", Université de Poitiers, 1, rue Georges Bonnet, Poitiers, France
| | - Anne Cantereau
- Laboratoire "Signalisation et Transports Ioniques Membranaires (STIM)", Université de Poitiers, 1, rue Georges Bonnet, Poitiers, France
| | - Reynald Hélye
- Laboratoire Coopératif "Lipotoxicity and Channelopathies - ConicMeds", Université de Poitiers, 1, rue Georges Bonnet, Poitiers, France
| | - Frédéric Becq
- Laboratoire "Signalisation et Transports Ioniques Membranaires (STIM)", Université de Poitiers, 1, rue Georges Bonnet, Poitiers, France
| | - Christophe Jayle
- Service de Chirurgie Cardiothoracique, CHU Poitiers, Poitiers, France
| | - Clarisse Vandebrouck
- Laboratoire "Signalisation et Transports Ioniques Membranaires (STIM)", Université de Poitiers, 1, rue Georges Bonnet, Poitiers, France
| | - Thierry Ferreira
- Laboratoire Coopératif "Lipotoxicity and Channelopathies - ConicMeds", Université de Poitiers, 1, rue Georges Bonnet, Poitiers, France.
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