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Chen Z, Jasinska W, Ashraf M, Rosental L, Hong J, Zhang D, Brotman Y, Shi J. Lipidomic insights into the response of Arabidopsis sepals to mild heat stress. ABIOTECH 2023; 4:224-237. [PMID: 37970465 PMCID: PMC10638258 DOI: 10.1007/s42994-023-00103-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Accepted: 04/03/2023] [Indexed: 11/17/2023]
Abstract
Arabidopsis sepals coordinate flower opening in the morning as ambient temperature rises; however, the underlying molecular mechanisms are poorly understood. Mutation of one heat shock protein encoding gene, HSP70-16, impaired sepal heat stress responses (HSR), disrupting lipid metabolism, especially sepal cuticular lipids, leading to abnormal flower opening. To further explore, to what extent, lipids play roles in this process, in this study, we compared lipidomic changes in sepals of hsp70-16 and vdac3 (mutant of a voltage-dependent anion channel, VDAC3, an HSP70-16 interactor) grown under both normal (22 °C) and mild heat stress (27 °C, mild HS) temperatures. Under normal temperature, neither hsp70-16 nor vdac3 sepals showed significant changes in total lipids; however, vdac3 but not hsp70-16 sepals exhibited significant reductions in the ratios of all detected 11 lipid classes, except the monogalactosyldiacylglycerols (MGDGs). Under mild HS temperature, hsp70-16 but not vdac3 sepals showed dramatic reduction in total lipids. In addition, vdac3 sepals exhibited a significant accumulation of plastidic lipids, especially sulfoquinovosyldiacylglycerols (SQDGs) and phosphatidylglycerols (PGs), whereas hsp70-16 sepals had a significant accumulation of triacylglycerols (TAGs) and simultaneous dramatic reductions in SQDGs and phospholipids (PLs), such as phosphatidylcholines (PCs), phosphatidylethanolamines (PEs), and phosphatidylserines (PSs). These findings revealed that the impact of mild HS on sepal lipidome is influenced by genetic factors, and further, that HSP70-16 and VDAC3 differently affect sepal lipidomic responses to mild HS. Our studies provide a lipidomic insight into functions of HSP and VDAC proteins in the plant's HSR, in the context of floral development. Supplementary Information The online version contains supplementary material available at 10.1007/s42994-023-00103-x.
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Affiliation(s)
- Zican Chen
- Joint International Research Laboratory of Metabolic and Developmental Sciences, State Key Laboratory of Hybrid Rice, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240 China
| | - Weronika Jasinska
- Department of Life Sciences, Ben Gurion University of the Negev, Beersheva, 84105 Israel
| | - Muhammad Ashraf
- Joint International Research Laboratory of Metabolic and Developmental Sciences, State Key Laboratory of Hybrid Rice, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240 China
| | - Leah Rosental
- Department of Life Sciences, Ben Gurion University of the Negev, Beersheva, 84105 Israel
| | - Jung Hong
- Joint International Research Laboratory of Metabolic and Developmental Sciences, State Key Laboratory of Hybrid Rice, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240 China
| | - Dabing Zhang
- Joint International Research Laboratory of Metabolic and Developmental Sciences, State Key Laboratory of Hybrid Rice, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240 China
- School of Agriculture, Food and Wine, University of Adelaide, Urrbrae, SA 5064 Australia
- Yazhou Bay Institute of Deepsea Sci-Tech, Shanghai Jiao Tong University, Shanghai, 200240 China
| | - Yariv Brotman
- Department of Life Sciences, Ben Gurion University of the Negev, Beersheva, 84105 Israel
| | - Jianxin Shi
- Joint International Research Laboratory of Metabolic and Developmental Sciences, State Key Laboratory of Hybrid Rice, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240 China
- Yazhou Bay Institute of Deepsea Sci-Tech, Shanghai Jiao Tong University, Shanghai, 200240 China
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Country MW, Haase K, Blank K, Canez CR, Roberts JA, Campbell BFN, Smith JC, Pelling AE, Jonz MG. Seasonal changes in membrane structure and excitability in retinal neurons of goldfish (Carassius auratus) under constant environmental conditions. J Exp Biol 2022; 225:275230. [PMID: 35485205 DOI: 10.1242/jeb.244238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 04/25/2022] [Indexed: 11/20/2022]
Abstract
Seasonal modifications in the structure of cellular membranes occur as an adaptive measure to withstand exposure to prolonged environmental change. Little is known about whether such changes may occur independently of external cues, such as photoperiod or temperature, or how they may impact the central nervous system. We compared membrane properties of neurons isolated from the retina of goldfish (Carassius auratus), an organism well-adapted to extreme environmental change, during the summer and winter months. Goldfish were maintained in a facility under constant environmental conditions throughout the year. Analysis of whole-retina phospholipid composition using mass spectrometry-based lipidomics revealed a two-fold increase in phosphatidylethanolamine species during the winter, suggesting an increase in cell membrane fluidity. Atomic force microscopy was used to produce localized, nanoscale-force deformation of neuronal membranes. Measurement of Young's modulus indicated increased membrane-cortical stiffness (or decreased elasticity) in neurons isolated during the winter. Voltage-clamp electrophysiology was used to assess physiological changes in neurons between seasons. Winter neurons displayed a hyperpolarized reversal potential (Vrev) and a significantly lower input resistance (Rin) compared to summer neurons. This was indicative of a decrease in membrane excitability during the winter. Subsequent measurement of intracellular Ca2+ activity using Fura-2 microspectrofluorometry confirmed a reduction in action potential activity, including duration and action potential profile, in neurons isolated during the winter. These studies demonstrate chemical and biophysical changes that occur in retinal neurons of goldfish throughout the year without exposure to seasonal cues, and suggest a novel mechanism of seasonal regulation of retinal activity.
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Affiliation(s)
| | | | - Katrin Blank
- Department of Chemistry, Carleton University, Canada
| | | | | | | | | | | | - Michael G Jonz
- Department of Biology, University of Ottawa, Canada.,Brain and Mind Research Institute, University of Ottawa, Canada
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DeMarco KR, Bekker S, Clancy CE, Noskov SY, Vorobyov I. Digging into Lipid Membrane Permeation for Cardiac Ion Channel Blocker d-Sotalol with All-Atom Simulations. Front Pharmacol 2018; 9:26. [PMID: 29449809 PMCID: PMC5799612 DOI: 10.3389/fphar.2018.00026] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Accepted: 01/10/2018] [Indexed: 12/31/2022] Open
Abstract
Interactions of drug molecules with lipid membranes play crucial role in their accessibility of cellular targets and can be an important predictor of their therapeutic and safety profiles. Very little is known about spatial localization of various drugs in the lipid bilayers, their active form (ionization state) or translocation rates and therefore potency to bind to different sites in membrane proteins. All-atom molecular simulations may help to map drug partitioning kinetics and thermodynamics, thus providing in-depth assessment of drug lipophilicity. As a proof of principle, we evaluated extensively lipid membrane partitioning of d-sotalol, well-known blocker of a cardiac potassium channel Kv11.1 encoded by the hERG gene, with reported substantial proclivity for arrhythmogenesis. We developed the positively charged (cationic) and neutral d-sotalol models, compatible with the biomolecular CHARMM force field, and subjected them to all-atom molecular dynamics (MD) simulations of drug partitioning through hydrated lipid membranes, aiming to elucidate thermodynamics and kinetics of their translocation and thus putative propensities for hydrophobic and aqueous hERG access. We found that only a neutral form of d-sotalol accumulates in the membrane interior and can move across the bilayer within millisecond time scale, and can be relevant to a lipophilic channel access. The computed water-membrane partitioning coefficient for this form is in good agreement with experiment. There is a large energetic barrier for a cationic form of the drug, dominant in water, to cross the membrane, resulting in slow membrane translocation kinetics. However, this form of the drug can be important for an aqueous access pathway through the intracellular gate of hERG. This route will likely occur after a neutral form of a drug crosses the membrane and subsequently re-protonates. Our study serves to demonstrate a first step toward a framework for multi-scale in silico safety pharmacology, and identifies some of the challenges that lie therein.
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Affiliation(s)
- Kevin R DeMarco
- Department of Physiology and Membrane Biology, University of California, Davis, Davis, CA, United States.,Department of Pharmacology, University of California, Davis, Davis, CA, United States.,Biophysics Graduate Group, University of California, Davis, Davis, CA, United States
| | - Slava Bekker
- Department of Physiology and Membrane Biology, University of California, Davis, Davis, CA, United States.,Hartnell College, Salinas, CA, United States
| | - Colleen E Clancy
- Department of Physiology and Membrane Biology, University of California, Davis, Davis, CA, United States.,Department of Pharmacology, University of California, Davis, Davis, CA, United States
| | - Sergei Y Noskov
- Centre for Molecular Simulations, Department of Biological Sciences, Faculty of Science, University of Calgary, Calgary, AB, Canada
| | - Igor Vorobyov
- Department of Physiology and Membrane Biology, University of California, Davis, Davis, CA, United States.,Department of Pharmacology, University of California, Davis, Davis, CA, United States
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Zhao XJ, Chen YL, Fu B, Zhang W, Liu Z, Zhuo H. Intervention of pumpkin seed oil on metabolic disease revealed by metabonomics and transcript profile. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2017; 97:1158-1163. [PMID: 27293203 DOI: 10.1002/jsfa.7842] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Revised: 12/04/2015] [Accepted: 06/05/2016] [Indexed: 06/06/2023]
Abstract
BACKGROUND Understanding the metabolic and transcription basis of pumpkin seed oil (PSO) intervention on metabolic disease (MD) is essential to daily nutrition and health. RESULTS This study analyzed the liver metabolic variations of Wistar rats fed normal diet (CON), high-fat diet (HFD) and high-fat plus PSO diet (PSO) to establish the relationship between the liver metabolite composition/transcript profile and the effects of PSO on MD. By using proton nuclear magnetic resonance spectroscopy together with multivariate data analysis, it was found that, compared with CON rats, HFD rats showed clear dysfunctions of choline metabolism, glucose metabolism and nucleotide and amino acid metabolism. Using quantitative real-time polymerase chain reaction (qPCR), it was found that, compared with HFD rats, PSO rats showed alleviated endoplasmic reticulum stress accompanied by lowered unfolded protein response. CONCLUSION These findings provide useful information to understand the metabolic alterations triggered by MD and to evaluate the effects of PSO intervention. © 2016 Society of Chemical Industry.
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Affiliation(s)
- Xiu-Ju Zhao
- School of Biology and Pharmaceutical Engineering, Collaborative Innovation Center for Processing of Agricultural Products (Hubei Province), Wuhan Polytechnic University, No. 68 South Xuefu Road, Changqing Garden, Wuhan, 430023, China
- Hubei Key Laboratory of Lipid Chemistry and Nutrition of Oil, Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Wuhan, 430062, China
| | - Yu-Lian Chen
- School of Biology and Pharmaceutical Engineering, Collaborative Innovation Center for Processing of Agricultural Products (Hubei Province), Wuhan Polytechnic University, No. 68 South Xuefu Road, Changqing Garden, Wuhan, 430023, China
| | - Bing Fu
- Changyuan Cuisine Vocational and Technical College, Changyuan, 453400, China
| | - Wen Zhang
- School of Food and Biological Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, China
| | - Zhiguo Liu
- School of Biology and Pharmaceutical Engineering, Collaborative Innovation Center for Processing of Agricultural Products (Hubei Province), Wuhan Polytechnic University, No. 68 South Xuefu Road, Changqing Garden, Wuhan, 430023, China
| | - Hexian Zhuo
- Xinxiang Institute for Drug Control, Food and Drug Administration of Xinxiang, No. 17 Jiankang Road, Xinxiang, 453000, China
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Kones R, Howell S, Rumana U. n-3 Polyunsaturated Fatty Acids and Cardiovascular Disease: Principles, Practices, Pitfalls, and Promises - A Contemporary Review. Med Princ Pract 2017; 26:497-508. [PMID: 29186721 PMCID: PMC5848472 DOI: 10.1159/000485837] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Accepted: 11/29/2017] [Indexed: 12/15/2022] Open
Abstract
Amidst voluminous literature, inconsistencies and opposing results have confused rather than clarified cardiologists' ability to assess the potential benefits of n-3 polyunsaturated fatty acids (n-3 PUFA). In perspective, there are common themes that emerge from n-3 PUFA studies, even as imperfect as they may be. The approach taken was to identify and unite these themes into a manageable, cohesive, evidence-based, yet useful synthesis. In all reviews and meta-analyses, the selection of component studies and assumptions influences outcomes. This overarching principle must be combined with the totality of the data, particularly when evidence is incompletely understood and gaps in knowledge must be bridged. Both the older literature and the most recent rigorous meta-analyses indicate that n-3 PUFA are highly pleiotropic agents with many documented positive physiological effects. Concordance among preclinical, observational, randomized clinical trials and meta-analyses is impressive. These agents have modest, statistically significant benefits which accrue over time. Given their favorable safety profile, a risk reduction of about 10% justifies their potential use in cardiovascular disease.
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Affiliation(s)
- Richard Kones
- The Cardiometabolic Research Institute, Texas, USA
- *Richard Kones MD, FAHA, FESC, FRSM, FCCP, FAGS, FRSH, FRSB, Cardiometabolic Research Institute, 8181 Fannin Street, Building 3, Unit 314, Houston, TX 77054-2913 (USA), E-Mail
| | - Scott Howell
- Department of Medicine, BMU School of Medicine, Winston-Salem, North Carolina, USA
| | - Umme Rumana
- The Cardiometabolic Research Institute, Texas, USA
- University of Texas Health Science Center Houston, Houston, Texas, USA
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Alkanols inhibit voltage-gated K(+) channels via a distinct gating modifying mechanism that prevents gate opening. Sci Rep 2015; 5:17402. [PMID: 26616025 PMCID: PMC4663795 DOI: 10.1038/srep17402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Accepted: 10/28/2015] [Indexed: 12/27/2022] Open
Abstract
Alkanols are small aliphatic compounds that inhibit voltage-gated K+ (Kv) channels through a yet unresolved gating mechanism. Kv channels detect changes in the membrane potential with their voltage-sensing domains (VSDs) that reorient and generate a transient gating current. Both 1-Butanol (1-BuOH) and 1-Hexanol (1-HeOH) inhibited the ionic currents of the Shaker Kv channel in a concentration dependent manner with an IC50 value of approximately 50 mM and 3 mM, respectively. Using the non-conducting Shaker-W434F mutant, we found that both alkanols immobilized approximately 10% of the gating charge and accelerated the deactivating gating currents simultaneously with ionic current inhibition. Thus, alkanols prevent the final VSD movement(s) that is associated with channel gate opening. Applying 1-BuOH and 1-HeOH to the Shaker-P475A mutant, in which the final gating transition is isolated from earlier VSD movements, strengthened that neither alkanol affected the early VSD movements. Drug competition experiments showed that alkanols do not share the binding site of 4-aminopyridine, a drug that exerts a similar effect at the gating current level. Thus, alkanols inhibit Shaker-type Kv channels via a unique gating modifying mechanism that stabilizes the channel in its non-conducting activated state.
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Poveda J, Giudici A, Renart M, Molina M, Montoya E, Fernández-Carvajal A, Fernández-Ballester G, Encinar J, González-Ros J. Lipid modulation of ion channels through specific binding sites. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1838:1560-7. [DOI: 10.1016/j.bbamem.2013.10.023] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Revised: 10/24/2013] [Accepted: 10/30/2013] [Indexed: 01/08/2023]
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Martín P, Moncada M, Enrique N, Asuaje A, Valdez Capuccino JM, Gonzalez C, Milesi V. Arachidonic acid activation of BKCa (Slo1) channels associated to the β1-subunit in human vascular smooth muscle cells. Pflugers Arch 2013; 466:1779-92. [DOI: 10.1007/s00424-013-1422-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2013] [Revised: 12/03/2013] [Accepted: 12/05/2013] [Indexed: 01/10/2023]
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9
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Omega-3 in Antiarrhythmic Therapy. High Blood Press Cardiovasc Prev 2012; 19:199-200. [DOI: 10.1007/bf03297630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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10
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Loussouarn G, Tarek M. Mechanisms of Ion Channels Voltage-Dependency: All about Molecular Sensors, Gates, Levers, Locks, and Grease. Front Pharmacol 2012; 3:174. [PMID: 23060794 PMCID: PMC3459010 DOI: 10.3389/fphar.2012.00174] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Accepted: 09/11/2012] [Indexed: 11/13/2022] Open
Affiliation(s)
- Gildas Loussouarn
- Institut National de la Santé et de la Recherche Médicale, UMR1087 Nantes, France ; Centre National de la Recherche Scientifique, UMR 6291 Nantes, France ; L'institut du Thorax, L'UNAM Université, Université de Nantes Nantes, France
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