401
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Kitchen P, Day RE, Salman MM, Conner MT, Bill RM, Conner AC. Beyond water homeostasis: Diverse functional roles of mammalian aquaporins. Biochim Biophys Acta Gen Subj 2015; 1850:2410-21. [PMID: 26365508 DOI: 10.1016/j.bbagen.2015.08.023] [Citation(s) in RCA: 106] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Revised: 08/25/2015] [Accepted: 08/30/2015] [Indexed: 01/02/2023]
Abstract
BACKGROUND Aquaporin (AQP) water channels are best known as passive transporters of water that are vital for water homeostasis. SCOPE OF REVIEW AQP knockout studies in whole animals and cultured cells, along with naturally occurring human mutations suggest that the transport of neutral solutes through AQPs has important physiological roles. Emerging biophysical evidence suggests that AQPs may also facilitate gas (CO2) and cation transport. AQPs may be involved in cell signalling for volume regulation and controlling the subcellular localization of other proteins by forming macromolecular complexes. This review examines the evidence for these diverse functions of AQPs as well their physiological relevance. MAJOR CONCLUSIONS As well as being crucial for water homeostasis, AQPs are involved in physiologically important transport of molecules other than water, regulation of surface expression of other membrane proteins, cell adhesion, and signalling in cell volume regulation. GENERAL SIGNIFICANCE Elucidating the full range of functional roles of AQPs beyond the passive conduction of water will improve our understanding of mammalian physiology in health and disease. The functional variety of AQPs makes them an exciting drug target and could provide routes to a range of novel therapies.
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Affiliation(s)
- Philip Kitchen
- Molecular Organisation and Assembly in Cells Doctoral Training Centre, University of Warwick, Coventry CV4 7AL, UK
| | - Rebecca E Day
- Biomedical Research Centre, Sheffield Hallam University, Howard Street, Sheffield S1 1WB, UK
| | - Mootaz M Salman
- Biomedical Research Centre, Sheffield Hallam University, Howard Street, Sheffield S1 1WB, UK
| | - Matthew T Conner
- Biomedical Research Centre, Sheffield Hallam University, Howard Street, Sheffield S1 1WB, UK
| | - Roslyn M Bill
- School of Life & Health Sciences and Aston Research Centre for Healthy Ageing, Aston University, Aston Triangle, Birmingham B4 7ET, UK
| | - Alex C Conner
- Institute of Clinical Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK.
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402
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X-ray irradiation activates K+ channels via H2O2 signaling. Sci Rep 2015; 5:13861. [PMID: 26350345 PMCID: PMC4642570 DOI: 10.1038/srep13861] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Accepted: 08/07/2015] [Indexed: 02/07/2023] Open
Abstract
Ionizing radiation is a universal tool in tumor therapy but may also cause secondary cancers or cell invasiveness. These negative side effects could be causally related to the human-intermediate-conductance Ca2+-activated-K+-channel (hIK), which is activated by X-ray irradiation and affects cell proliferation and migration. To analyze the signaling cascade downstream of ionizing radiation we use genetically encoded reporters for H2O2 (HyPer) and for the dominant redox-buffer glutathione (Grx1-roGFP2) to monitor with high spatial and temporal resolution, radiation-triggered excursions of H2O2 in A549 and HEK293 cells. The data show that challenging cells with ≥1 Gy X-rays or with UV-A laser micro-irradiation causes a rapid rise of H2O2 in the nucleus and in the cytosol. This rise, which is determined by the rate of H2O2 production and glutathione-buffering, is sufficient for triggering a signaling cascade that involves an elevation of cytosolic Ca2+ and eventually an activation of hIK channels.
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403
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Molina-Hidalgo FJ, Medina-Puche L, Gelis S, Ramos J, Sabir F, Soveral G, Prista C, Iglesias-Fernández R, Caballero JL, Muñoz-Blanco J, Blanco-Portales R. Functional characterization of FaNIP1;1 gene, a ripening-related and receptacle-specific aquaporin in strawberry fruit. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2015; 238:198-211. [PMID: 26259188 DOI: 10.1016/j.plantsci.2015.06.013] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Revised: 06/11/2015] [Accepted: 06/13/2015] [Indexed: 05/23/2023]
Abstract
Strawberry fruit (Fragaria × ananassa) is a soft fruit with high water content at ripe stage (more than 90% of its fresh weight). Aquaporins play an important role in plant water homeostasis, through the facilitation of water transport and solutes. We report the role played by FaNIP1;1 in the receptacle ripening process. The analysis by qRT-PCR of FaNIP1;1 showed that this gene is mainly expressed in fruit receptacle and has a ripening-related expression pattern that was accompanied by an increase in both the abscisic acid and water content of the receptacle throughout fruit ripening. Moreover, FaNIP1;1 was induced in situations of water deficit. Additionally, we show that FaNIP1;1 expression was positively regulated by abscisic acid and negatively regulated by auxins. The water transport capacity of FaNIP1;1 was determined by a stopped-flow spectroscopy in yeast over-expressing FaNIP1;1. Glycerol, H2O2 and boron transport were also demonstrated in yeast. On the other hand, GFP-FaNIP1;1 fusion protein was located in plasma membrane. In conclusion, FaNIP1;1 seems to play an important role increasing the plasma membrane permeability, that allows the water accumulation in the strawberry fruit receptacle throughout the ripening process.
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Affiliation(s)
- Francisco J Molina-Hidalgo
- Department of Biochemistry and Molecular Biology, Edificio Severo Ochoa C-6, Campus Universitario de Rabanales y Campus de Excelencia Internacional Agroalimentario CEIA3, Universidad de Córdoba, 14071, Spain
| | - Laura Medina-Puche
- Department of Biochemistry and Molecular Biology, Edificio Severo Ochoa C-6, Campus Universitario de Rabanales y Campus de Excelencia Internacional Agroalimentario CEIA3, Universidad de Córdoba, 14071, Spain
| | - Samuel Gelis
- Department of Microbiology, Edificio Severo Ochoa C-6, Campus Universitario de Rabanales y Campus de Excelencia Internacional Agroalimentario CEIA3, Universidad de Córdoba, 14071, Spain
| | - José Ramos
- Department of Microbiology, Edificio Severo Ochoa C-6, Campus Universitario de Rabanales y Campus de Excelencia Internacional Agroalimentario CEIA3, Universidad de Córdoba, 14071, Spain
| | - Farzana Sabir
- CBAA, Instituto Superior de Agronomia, Universidade de Lisboa, 1649-003, Portugal; Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, 1649-003, Portugal
| | - Graça Soveral
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, 1649-003, Portugal; Departamento de Bioquímica e Biologia Humana, Faculdade de Farmácia, Universidade de Lisboa, 1649-003, Portugal
| | - Catarina Prista
- CBAA, Instituto Superior de Agronomia, Universidade de Lisboa, 1649-003, Portugal
| | - Raquel Iglesias-Fernández
- Centro de Biotecnología y Genómica de Plantas (UPM-INIA), Campus de Montegancedo, and E.T.S.I. Agrónomos, Universidad Politécnica de Madrid 28223, Spain
| | - José L Caballero
- Department of Biochemistry and Molecular Biology, Edificio Severo Ochoa C-6, Campus Universitario de Rabanales y Campus de Excelencia Internacional Agroalimentario CEIA3, Universidad de Córdoba, 14071, Spain
| | - Juan Muñoz-Blanco
- Department of Biochemistry and Molecular Biology, Edificio Severo Ochoa C-6, Campus Universitario de Rabanales y Campus de Excelencia Internacional Agroalimentario CEIA3, Universidad de Córdoba, 14071, Spain.
| | - Rosario Blanco-Portales
- Department of Biochemistry and Molecular Biology, Edificio Severo Ochoa C-6, Campus Universitario de Rabanales y Campus de Excelencia Internacional Agroalimentario CEIA3, Universidad de Córdoba, 14071, Spain
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404
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Görlach A, Bertram K, Hudecova S, Krizanova O. Calcium and ROS: A mutual interplay. Redox Biol 2015; 6:260-271. [PMID: 26296072 PMCID: PMC4556774 DOI: 10.1016/j.redox.2015.08.010] [Citation(s) in RCA: 917] [Impact Index Per Article: 101.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Revised: 08/08/2015] [Accepted: 08/10/2015] [Indexed: 02/07/2023] Open
Abstract
Calcium is an important second messenger involved in intra- and extracellular signaling cascades and plays an essential role in cell life and death decisions. The Ca2+ signaling network works in many different ways to regulate cellular processes that function over a wide dynamic range due to the action of buffers, pumps and exchangers on the plasma membrane as well as in internal stores. Calcium signaling pathways interact with other cellular signaling systems such as reactive oxygen species (ROS). Although initially considered to be potentially detrimental byproducts of aerobic metabolism, it is now clear that ROS generated in sub-toxic levels by different intracellular systems act as signaling molecules involved in various cellular processes including growth and cell death. Increasing evidence suggests a mutual interplay between calcium and ROS signaling systems which seems to have important implications for fine tuning cellular signaling networks. However, dysfunction in either of the systems might affect the other system thus potentiating harmful effects which might contribute to the pathogenesis of various disorders. Calcium and ROS act as signaling molecules inside the cell and their pathways can interact. The mutual interplay of calcium and ROS is required for the fine tuning of signaling. Failure in the interplay results in dysfunction and pathologies.
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Affiliation(s)
- Agnes Görlach
- Experimental and Molecular Pediatric Cardiology, German Heart Center Munich at the Technical University Munich, Germany; DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, Munich, Germany.
| | - Katharina Bertram
- Experimental and Molecular Pediatric Cardiology, German Heart Center Munich at the Technical University Munich, Germany
| | - Sona Hudecova
- Center for Molecular Medicine, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Olga Krizanova
- Center for Molecular Medicine, Slovak Academy of Sciences, Bratislava, Slovakia; Institute of Virology, Slovak Academy of Sciences, Bratislava, Slovakia.
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405
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Polyphenols as Modulators of Aquaporin Family in Health and Disease. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2015; 2015:196914. [PMID: 26346093 PMCID: PMC4539495 DOI: 10.1155/2015/196914] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Accepted: 07/21/2015] [Indexed: 11/24/2022]
Abstract
Polyphenols are bioactive molecules widely distributed in fruits, vegetables, cereals, and beverages. Polyphenols in food sources are extensively studied for their role in the maintenance of human health and in the protection against development of chronic/degenerative diseases. Polyphenols act mainly as antioxidant molecules, protecting cell constituents against oxidative damage. The enormous number of polyphenolic compounds leads to huge different mechanisms of action not fully understood. Recently, some evidence is emerging about the role of polyphenols, such as curcumin, pinocembrin, resveratrol, and quercetin, in modulating the activity of some aquaporin (AQP) isoforms. AQPs are integral, small hydrophobic water channel proteins, extensively expressed in many organs and tissues, whose major function is to facilitate the transport of water or glycerol over cell plasma membranes. Here we summarize AQP physiological functions and report emerging evidence on the implication of these proteins in a number of pathophysiological processes. In particular, this review offers an overview about the role of AQPs in brain, eye, skin diseases, and metabolic syndrome, focusing on the ability of polyphenols to modulate AQP expression. This original analysis can contribute to elucidating some peculiar effects exerted by polyphenols and can lead to the development of an innovative potential preventive/therapeutic strategy.
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406
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Suzuki M, Shibata Y, Ogushi Y, Okada R. Molecular machinery for vasotocin-dependent transepithelial water movement in amphibians: aquaporins and evolution. THE BIOLOGICAL BULLETIN 2015; 229:109-119. [PMID: 26338873 DOI: 10.1086/bblv229n1p109] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Amphibians represent the first vertebrates to adapt to terrestrial environments, and are successfully distributed around the world. The ventral skin, kidney, and urinary bladder are important osmoregulatory organs for adult anuran amphibians. Water channel proteins, called aquaporins (AQPs), play key roles in transepithelial water absorption/reabsorption in these organs. At least 43 types of AQPs were identified in anurans; a recent phylogenetic analysis categorized anuran AQPs among 16 classes (AQP0-14, 16). Anuran-specific AQPa2 was assigned to AQP6, then was further subdivided into the ventral skin-type (AQP6vs; AQPa2S), whose expression is confined to the ventral skin, and the urinary bladder-type (AQP6ub; AQPa2U), which is basically expressed in the urinary bladder. For the osmoregulatory organs, AQP3 is constitutively located in the basolateral plasma membrane of tight-junctioned epithelial cells. AQP6vs, AQP2 and/or AQP6ub are also expressed in these epithelial cells and are translocated to the apical membrane in response to arginine vasotocin, thereby regulating water absorption/reabsorption. It was suggested recently that two subtypes of AQP6vs contribute to cutaneous water absorption in Ranid species. In addition, AQP5 (AQP5a) and AQP5L (AQP5b) were identified from Xenopus tropicalis Gray, 1864, and AQP5 was localized to the apical membrane of luminal epithelial cells of the urinary bladder in dehydrated Xenopus. This finding suggested that AQP5 may be involved in water reabsorption from this organ under dehydration. Based on the hitherto reported information, we propose models for the evolution of water-absorbing/reabsorbing mechanisms in anuran osmoregulatory organs in association with AQPs.
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Affiliation(s)
- Masakazu Suzuki
- Integrated Bioscience Section, Graduate School of Science and Technology, Shizuoka University, 836, Ohya, Suruga-ward, Shizuoka-city, Shizuoka 422-8529, Japan
| | - Yuki Shibata
- Integrated Bioscience Section, Graduate School of Science and Technology, Shizuoka University, 836, Ohya, Suruga-ward, Shizuoka-city, Shizuoka 422-8529, Japan
| | - Yuji Ogushi
- Integrated Bioscience Section, Graduate School of Science and Technology, Shizuoka University, 836, Ohya, Suruga-ward, Shizuoka-city, Shizuoka 422-8529, Japan
| | - Reiko Okada
- Integrated Bioscience Section, Graduate School of Science and Technology, Shizuoka University, 836, Ohya, Suruga-ward, Shizuoka-city, Shizuoka 422-8529, Japan
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407
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Abstract
In this review, we provide a brief synopsis of the evolution and functional diversity of the aquaporin gene superfamily in prokaryotic and eukaryotic organisms. Based upon the latest data, we discuss the expanding list of molecules shown to permeate the central pore of aquaporins, and the unexpected diversity of water channel genes in Archaea and Bacteria. We further provide new insight into the origin by horizontal gene transfer of plant glycerol-transporting aquaporins (NIPs), and the functional co-option and gene replacement of insect glycerol transporters. Finally, we discuss the origins of four major grades of aquaporins in Eukaryota, together with the increasing repertoires of aquaporins in vertebrates.
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Affiliation(s)
- Roderick Nigel Finn
- Department of Biology, Bergen High Technology Centre, University of Bergen, Norway; Institute of Marine Research, Nordnes, 5817 Bergen, Norway; and
| | - Joan Cerdà
- Institut de Recerca i Tecnologia Agroalimentàries (IRTA)-Institut de Ciències del Mar, Consejo Superior de Investigaciones Científicas (CSIC), 08003 Barcelona, Spain
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408
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Boj M, Chauvigné F, Cerdà J. Aquaporin biology of spermatogenesis and sperm physiology in mammals and teleosts. THE BIOLOGICAL BULLETIN 2015; 229:93-108. [PMID: 26338872 DOI: 10.1086/bblv229n1p93] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Fluid homeostasis is recognized as a critical factor during the development, maturation, and function of vertebrate male germ cells. These processes have been associated with the presence of multiple members of the aquaporin superfamily of water and solute channels in different cell types along the reproductive tract as well as in spermatozoa. We present a comparative analysis of the existing knowledge of aquaporin biology in the male reproductive tissues of mammals and teleosts. Current data suggest that in both vertebrate groups, aquaporins may have similar functions during differentiation of spermatozoa in the germinal epithelium, in the concentration and maturation of sperm in the testicular ducts, and in the regulation of osmotically induced volume changes in ejaculated spermatozoa. Recent studies have also provided insight into the possible function of aquaporins beyond water transport, such as in signaling pathways during spermatogenesis or the sensing of cell swelling and mitochondrial peroxide transport in activated sperm. However, an understanding of the specific physiological functions of the various aquaporins during germ cell development and sperm motility, as well as the molecular mechanisms involved, remains elusive. Novel experimental approaches need to be developed to elucidate these processes and to dissect the regulatory intracellular pathways implicated, which will greatly help to uncover the molecular basis of sperm physiology and male fertility in vertebrates.
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Affiliation(s)
- Mónica Boj
- Institut de Recerca i Tecnologia Agroalimentàries (IRTA)-Institut de Ciències del Mar, Consejo Superior de Investigaciones Científicas (CSIC), 08003 Barcelona, Spain; and
| | - François Chauvigné
- Institut de Recerca i Tecnologia Agroalimentàries (IRTA)-Institut de Ciències del Mar, Consejo Superior de Investigaciones Científicas (CSIC), 08003 Barcelona, Spain; and Department of Biology, Bergen High Technology Centre, University of Bergen, 5020 Bergen, Norway
| | - Joan Cerdà
- Institut de Recerca i Tecnologia Agroalimentàries (IRTA)-Institut de Ciències del Mar, Consejo Superior de Investigaciones Científicas (CSIC), 08003 Barcelona, Spain; and
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409
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Mao Z, Sun W. Arabidopsis seed-specific vacuolar aquaporins are involved in maintaining seed longevity under the control of ABSCISIC ACID INSENSITIVE 3. JOURNAL OF EXPERIMENTAL BOTANY 2015; 66:4781-94. [PMID: 26019256 PMCID: PMC4507774 DOI: 10.1093/jxb/erv244] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The tonoplast intrinsic proteins TIP3;1 and TIP3;2 are specifically expressed during seed maturation and localized to the seed protein storage vacuole membrane. However, the function and physiological roles of TIP3s are still largely unknown. The seed performance of TIP3 knockdown mutants was analysed using the controlled deterioration test. The tip3;1/tip3;2 double mutant was affected in seed longevity and accumulated high levels of hydrogen peroxide compared with the wild type, suggesting that TIP3s function in seed longevity. The transcription factor ABSCISIC ACID INSENSITIVE 3 (ABI3) is known to be involved in seed desiccation tolerance and seed longevity. TIP3 transcript and protein levels were significantly reduced in abi3-6 mutant seeds. TIP3;1 and TIP3;2 promoters could be activated by ABI3 in the presence of abscisic acid (ABA) in Arabidopsis protoplasts. TIP3 proteins were detected in the protoplasts transiently expressing ABI3 and in ABI3-overexpressing seedlings when treated with ABA. Furthermore, ABI3 directly binds to the RY motif of the TIP3 promoters. Therefore, seed-specific TIP3s may help maintain seed longevity under the expressional control of ABI3 during seed maturation and are members of the ABI3-mediated seed longevity pathway together with small heat shock proteins and late embryo abundant proteins.
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Affiliation(s)
- Zhilei Mao
- Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Fenglin Road 300, Shanghai, 200032, People's Republic of China
| | - Weining Sun
- Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Fenglin Road 300, Shanghai, 200032, People's Republic of China
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410
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Kelts JL, Cali JJ, Duellman SJ, Shultz J. Altered cytotoxicity of ROS-inducing compounds by sodium pyruvate in cell culture medium depends on the location of ROS generation. SPRINGERPLUS 2015; 4:269. [PMID: 26090316 PMCID: PMC4469600 DOI: 10.1186/s40064-015-1063-y] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/02/2015] [Accepted: 05/27/2015] [Indexed: 11/16/2022]
Abstract
Induction of oxidative stress by drugs and other xenobiotics is an important mechanism of cytotoxicity. However, in vitro studies on the relationship between oxidative stress and cytotoxicity in cultured cells is frequently complicated by the fact that cell culture medium components affect reactive oxygen species (ROS) exposures in ways that vary with the mode of ROS production. The objectives of this study were to first determine the mode of ROS induction by certain model compounds when they are applied to cultured cells, and then to determine how ROS induction and cytotoxicity were affected by the ROS-quenching medium component pyruvate. Three compounds, eseroline, benserazide, and pyrogallol induced H2O2 in cell culture media independent of cells. However, another compound, menadione, induced H2O2 in a manner largely dependent on the MDA-MB-231 breast cancer cells used in this study, which is consistent with its known mechanism of inducing ROS through intracellular redox cycling. 1 mM pyruvate, as well as catalase, reduced the H2O2 in culture wells with each ROS inducer tested but it only reduced the cytotoxicity of cell-independent inducers. It reduced the cytotoxicity of benserazide and pyrogallol >10-fold and of eseroline about 2.5-fold, but had no effect on menadione cytotoxicity. From this data, it was concluded that depending on the mechanism of ROS induction, whether intra- or extracellular, a ROS-quenching medium component such as pyruvate will differentially affect the net ROS-induction and cytotoxicity of a test compound.
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Affiliation(s)
- Jessica L Kelts
- Department of Chemistry and Biochemistry, University of Michigan-Flint, 556 Murchie Science Building 303 E. Kearsley St., Flint, MI 48502 USA
| | - James J Cali
- Research and Development, Promega Corporation, 2800 Woods Hollow Dr., Madison, WI 53711 USA
| | - Sarah J Duellman
- Research and Development, Promega Corporation, 2800 Woods Hollow Dr., Madison, WI 53711 USA
| | - John Shultz
- Research and Development, Promega Corporation, 2800 Woods Hollow Dr., Madison, WI 53711 USA
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411
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Cobley JN, Margaritelis NV, Morton JP, Close GL, Nikolaidis MG, Malone JK. The basic chemistry of exercise-induced DNA oxidation: oxidative damage, redox signaling, and their interplay. Front Physiol 2015; 6:182. [PMID: 26136689 PMCID: PMC4469819 DOI: 10.3389/fphys.2015.00182] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Accepted: 06/02/2015] [Indexed: 12/20/2022] Open
Abstract
Acute exercise increases reactive oxygen and nitrogen species generation. This phenomenon is associated with two major outcomes: (1) redox signaling and (2) macromolecule damage. Mechanistic knowledge of how exercise-induced redox signaling and macromolecule damage are interlinked is limited. This review focuses on the interplay between exercise-induced redox signaling and DNA damage, using hydroxyl radical (·OH) and hydrogen peroxide (H2O2) as exemplars. It is postulated that the biological fate of H2O2 links the two processes and thus represents a bifurcation point between redox signaling and damage. Indeed, H2O2 can participate in two electron signaling reactions but its diffusion and chemical properties permit DNA oxidation following reaction with transition metals and ·OH generation. It is also considered that the sensing of DNA oxidation by repair proteins constitutes a non-canonical redox signaling mechanism. Further layers of interaction are provided by the redox regulation of DNA repair proteins and their capacity to modulate intracellular H2O2 levels. Overall, exercise-induced redox signaling and DNA damage may be interlinked to a greater extent than was previously thought but this requires further investigation.
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Affiliation(s)
- James N Cobley
- Division of Sport and Exercise Sciences, Abertay University Dundee, UK
| | - Nikos V Margaritelis
- Exercise Physiology and Biochemistry Laboratory, School of Physical Education and Sport Sciences at Serres, Aristotle University of Thessaloniki Serres, Greece
| | - James P Morton
- Muscle Metabolism Research Group, Research Institute for Sport and Exercise Science, Liverpool John Moores University Liverpool, UK
| | - Graeme L Close
- Muscle Metabolism Research Group, Research Institute for Sport and Exercise Science, Liverpool John Moores University Liverpool, UK
| | - Michalis G Nikolaidis
- Exercise Physiology and Biochemistry Laboratory, School of Physical Education and Sport Sciences at Serres, Aristotle University of Thessaloniki Serres, Greece
| | - John K Malone
- Division of Sport and Exercise Sciences, Abertay University Dundee, UK
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412
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Hove RM, Ziemann M, Bhave M. Identification and Expression Analysis of the Barley (Hordeum vulgare L.) Aquaporin Gene Family. PLoS One 2015; 10:e0128025. [PMID: 26057533 PMCID: PMC4461243 DOI: 10.1371/journal.pone.0128025] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Accepted: 04/21/2015] [Indexed: 01/10/2023] Open
Abstract
Aquaporins (AQPs) are major intrinsic proteins (MIPs) that mediate bidirectional flux of water and other substrates across cell membranes, and play critical roles in plant-water relations, dehydration stress responses and crop productivity. However, limited data are available as yet on the contributions of these proteins to the physiology of the major crop barley (Hordeum vulgare). The present work reports the identification and expression analysis of the barley MIP family. A comprehensive search of publicly available leaf mRNA-seq data, draft barley genome data, GenBank transcripts and sixteen new annotations together revealed that the barley MIP family is comprised of at least forty AQPs. Alternative splicing events were likely in two plasma membrane intrinsic protein (PIP) AQPs. Analyses of the AQP signature sequences and specificity determining positions indicated a potential of several putative AQP isoforms to transport non-aqua substrates including physiological important substrates, and respond to abiotic stresses. Analysis of our publicly available leaf mRNA-seq data identified notable differential expression of HvPIP1;2 and HvTIP4;1 under salt stress. Analyses of other gene expression resources also confirmed isoform-specific responses in different tissues and/or in response to salinity, as well as some potentially inter-cultivar differences. The work reports systematic and comprehensive analysis of most, if not all, barley AQP genes, their sequences, expression patterns in different tissues, potential transport and stress response functions, and a strong framework for selection and/or development of stress tolerant barley varieties. In addition, the barley data would be highly valuable for genetic studies of the evolutionarily closely related wheat (Triticum aestivum L.).
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Affiliation(s)
- Runyararo M. Hove
- Faculty of Science, Engineering and Technology, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia
| | - Mark Ziemann
- Baker IDI Heart and Diabetes Institute, Melbourne, VIC 3004, Australia
| | - Mrinal Bhave
- Faculty of Science, Engineering and Technology, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia
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413
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Abstract
ABSTRACT
Environmental (acute and chronic temperature, osmotic, hypoxic and pH) stress challenges the cellular redox balance and can lead to the increased production of reactive oxygen species (ROS). This review provides an overview of the reactions producing and scavenging ROS in the mitochondria, endoplasmic reticulum (ER) and peroxisome. It then compares these reactions with the findings of a number of studies investigating the proteomic responses of marine organisms to environmentally induced oxidative stress. These responses indicate that the thioredoxin–peroxiredoxin system is possibly more frequently recruited to scavenge H2O2 than the glutathione system. Isoforms of superoxide dismutase (SOD) are not ubiquitously induced in parallel, suggesting that SOD scavenging activity is sometimes sufficient. The glutathione system plays an important role in some organisms and probably also contributes to protecting protein thiols during environmental stress. Synthesis pathways of cysteine and selenocysteine, building blocks for glutathione and glutathione peroxidase, also play an important role in scavenging ROS during stress. The increased abundance of glutaredoxin and DyP-type peroxidase suggests a need for regulating the deglutathionylation of proteins and scavenging of peroxynitrite. Reducing equivalents for these scavenging reactions are generated by proteins of the pentose phosphate pathway and by NADP-dependent isocitrate dehydrogenase. Furthermore, proteins representing reactions of the tricarboxylic acid cycle and the electron transport system generating NADH and ROS, including those of complex I, II and III, are frequently reduced in abundance with stress. Protein maturation in the ER likely represents another source of ROS during environmental stress, as indicated by simultaneous changes in ER chaperones and antioxidant proteins. Although there are still too few proteomic analyses of non-model organisms exposed to environmental stress for a general pattern to emerge, hyposaline and low pH stress show different responses from temperature and hypoxic stress. Furthermore, comparisons of closely related congeners differing in stress tolerance start to provide insights into biochemical processes contributing to adaptive differences, but more of these comparisons are needed to draw general conclusions. To fully take advantage of a systems approach, studies with longer time courses, including several tissues and more species comparisons are needed.
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414
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Margittai É, Enyedi B, Csala M, Geiszt M, Bánhegyi G. Composition of the redox environment of the endoplasmic reticulum and sources of hydrogen peroxide. Free Radic Biol Med 2015; 83:331-40. [PMID: 25678412 DOI: 10.1016/j.freeradbiomed.2015.01.032] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Revised: 01/30/2015] [Accepted: 01/31/2015] [Indexed: 12/22/2022]
Abstract
The endoplasmic reticulum (ER) is a metabolically active organelle, which has a central role in proteostasis by translating, modifying, folding, and occasionally degrading secretory and membrane proteins. The lumen of the ER represents a separate compartment of the eukaryotic cell, with a characteristic proteome and metabolome. Although the redox metabolome and proteome of the compartment have not been holistically explored, it is evident that proper redox conditions are necessary for the functioning of many luminal pathways. These redox conditions are defined by local oxidoreductases and the membrane transport of electron donors and acceptors. The main electron carriers of the compartment are identical with those of the other organelles: glutathione, pyridine and flavin nucleotides, ascorbate, and others. However, their composition, concentration, and redox state in the ER lumen can be different from those observed in other compartments. The terminal oxidases of oxidative protein folding generate and maintain an "oxidative environment" by oxidizing protein thiols and producing hydrogen peroxide. ER-specific mechanisms reutilize hydrogen peroxide as an electron acceptor of oxidative folding. These mechanisms, together with membrane and kinetic barriers, guarantee that redox systems in the reduced or oxidized state can be present simultaneously in the lumen. The present knowledge on the in vivo conditions of ER redox is rather limited; development of new genetically encoded targetable sensors for the measurement of the luminal state of redox systems other than thiol/disulfide will contribute to a better understanding of ER redox homeostasis.
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Affiliation(s)
- Éva Margittai
- Institute of Human Physiology and Clinical Experimental Research, Semmelweis University, Budapest 1444, Hungary
| | - Balázs Enyedi
- Department of Physiology, Semmelweis University, Budapest 1444, Hungary
| | - Miklós Csala
- Department of Medical Chemistry, Molecular Biology and Pathobiochemistry, Semmelweis University, Budapest 1444, Hungary
| | - Miklós Geiszt
- Department of Physiology, Semmelweis University, Budapest 1444, Hungary; "Lendület" Peroxidase Enzyme Research Group of Semmelweis University and the Hungarian Academy of Sciences, Semmelweis University, Budapest 1444, Hungary
| | - Gábor Bánhegyi
- Department of Medical Chemistry, Molecular Biology and Pathobiochemistry, Semmelweis University, Budapest 1444, Hungary.
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415
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Shigeoka S, Maruta T. Cellular redox regulation, signaling, and stress response in plants. Biosci Biotechnol Biochem 2015; 78:1457-70. [PMID: 25209493 DOI: 10.1080/09168451.2014.942254] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Cellular and organellar redox states, which are characterized by the balance between oxidant and antioxidant pool sizes, play signaling roles in the regulation of gene expression and protein function in a wide variety of plant physiological processes including stress acclimation. Reactive oxygen species (ROS) and ascorbic acid (AsA) are the most abundant oxidants and antioxidants, respectively, in plant cells; therefore, the metabolism of these redox compounds must be strictly and spatiotemporally controlled. In this review, we provided an overview of our previous studies as well as recent advances in (1) the molecular mechanisms and regulation of AsA biosynthesis, (2) the molecular and genetic properties of ascorbate peroxidases, and (3) stress acclimation via ROS-derived oxidative/redox signaling pathways, and discussed future perspectives in this field.
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Affiliation(s)
- Shigeru Shigeoka
- a Faculty of Agriculture, Department of Advanced Bioscience , Kinki University , Nara , Japan
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416
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Wan F, Mao Y, Dong Y, Ju L, Wu G, Gao H. Impaired cell envelope resulting from arcA mutation largely accounts for enhanced sensitivity to hydrogen peroxide in Shewanella oneidensis. Sci Rep 2015; 5:10228. [PMID: 25975178 PMCID: PMC4432559 DOI: 10.1038/srep10228] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Accepted: 04/07/2015] [Indexed: 01/06/2023] Open
Abstract
Oxidative stress is one of the major challenges that Shewanella encounter routinely because they thrive in redox-stratified environments prone to reactive oxygen species (ROS) formation, letting alone that ROS can be generated endogenously. As respiration is the predominant process for endogenous ROS, regulators mediating respiration have been demonstrated and/or implicated to play a role in oxidative stress response. In our efforts to unveil the involvement of global regulators for respiration in the oxidative stress response, we found that loss of the Arc system increases S. oneidensis sensitivity to H2O2 whereas neither Fnr nor Crp has a significant role. A comparison of transcriptomic profiles of the wild-type and its isogenic arcA mutant revealed that the OxyR regulon is independent of the Arc system. We then provided evidence that the enhanced H2O2 sensitivity of the arcA mutant is due to an increased H2O2 uptake rate, a result of a cell envelope defect. Although one of three proteases of the ArcA regulon when in excess is partially accountable for the envelope defect, the major contributors remain elusive. Overall, our data indicate that the Arc system influences the bacterial cell envelope biosynthesis, a physiological aspect that has not been associated with the regulator before.
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Affiliation(s)
- Fen Wan
- Institute of Microbiology and College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Yinting Mao
- Institute of Microbiology and College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Yangyang Dong
- Institute of Microbiology and College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Lili Ju
- Institute of Microbiology and College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Genfu Wu
- Institute of Microbiology and College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Haichun Gao
- Institute of Microbiology and College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
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417
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Cordeiro RM. Molecular dynamics simulations of the transport of reactive oxygen species by mammalian and plant aquaporins. Biochim Biophys Acta Gen Subj 2015; 1850:1786-94. [PMID: 25982446 DOI: 10.1016/j.bbagen.2015.05.007] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2015] [Revised: 05/06/2015] [Accepted: 05/07/2015] [Indexed: 11/25/2022]
Abstract
BACKGROUND Aquaporins are responsible for water transport across lipid membranes. They are also able to transport reactive oxygen species, playing an important role in redox signaling. Certain plant aquaporins have even the ability to be regulated by oxidative stress. However, the underlying mechanisms are still not fully understood. METHODS Here, molecular dynamics simulations were employed to determine the activation free energies related to the transport of reactive oxygen species through both mammalian and plant aquaporin models. RESULTS AND CONCLUSIONS Both aquaporins may transport hydrogen peroxide (H2O2) and the protonated form of superoxide radicals (HO2). The solution-to-pore transfer free energies were low for small oxy-radicals, suggesting that even highly reactive hydroxyl radicals (HO) might have access to the pore interior and oxidize amino acids responsible for channel selectivity. In the plant aquaporin, no significant change in water permeability was observed upon oxidation of the solvent-exposed disulfide bonds at the extracellular region. During the simulated time scale, the existence of a direct oxidative gating mechanism involving these disulfide bonds could not be demonstrated. GENERAL SIGNIFICANCE Simulation results may improve the understanding of redox signaling mechanisms and help in the interpretation of protein oxidative labeling experiments.
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Affiliation(s)
- Rodrigo M Cordeiro
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Avenida dos Estados 5001, CEP 09210-580, Santo André, SP, Brazil.
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418
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Ristić AJ, Savić D, Sokić D, Bogdanović Pristov J, Nestorov J, Baščarević V, Raičević S, Savić S, Spasojević I. Hippocampal antioxidative system in mesial temporal lobe epilepsy. Epilepsia 2015; 56:789-99. [DOI: 10.1111/epi.12981] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/26/2015] [Indexed: 01/01/2023]
Affiliation(s)
- Aleksandar J. Ristić
- Center for Epilepsy and Sleep Disorders; Neurology Clinic; Clinical Center of Serbia; Belgrade Serbia
| | - Danijela Savić
- Department of Neurobiology; Institute for Biological Research “Siniša Stanković”; University of Belgrade; Belgrade Serbia
| | - Dragoslav Sokić
- Center for Epilepsy and Sleep Disorders; Neurology Clinic; Clinical Center of Serbia; Belgrade Serbia
| | - Jelena Bogdanović Pristov
- Life Sciences Department; Institute for Multidisciplinary Research; University of Belgrade; Belgrade Serbia
| | - Jelena Nestorov
- Department of Biochemistry; Institute for Biological Research “Siniša Stanković”; University of Belgrade; Belgrade Serbia
| | | | - Savo Raičević
- Institute for Neurosurgery; Clinical Center of Serbia; Belgrade Serbia
| | - Slobodan Savić
- Institute of Forensic Medicine; Medical School; University of Belgrade; Belgrade Serbia
| | - Ivan Spasojević
- Life Sciences Department; Institute for Multidisciplinary Research; University of Belgrade; Belgrade Serbia
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419
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Membrane transporter engineering in industrial biotechnology and whole cell biocatalysis. Trends Biotechnol 2015; 33:237-46. [DOI: 10.1016/j.tibtech.2015.02.001] [Citation(s) in RCA: 145] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Revised: 01/15/2015] [Accepted: 02/02/2015] [Indexed: 02/06/2023]
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420
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Reddy PS, Rao TSRB, Sharma KK, Vadez V. Genome-wide identification and characterization of the aquaporin gene family in Sorghum bicolor (L.). ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.plgene.2014.12.002] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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421
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Lee CR, Patel JC, O'Neill B, Rice ME. Inhibitory and excitatory neuromodulation by hydrogen peroxide: translating energetics to information. J Physiol 2015; 593:3431-46. [PMID: 25605547 DOI: 10.1113/jphysiol.2014.273839] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 01/16/2015] [Indexed: 12/21/2022] Open
Abstract
Historically, brain neurochemicals have been broadly classified as energetic or informational. However, increasing evidence implicates metabolic substrates and byproducts as signalling agents, which blurs the boundary between energy and information, and suggests the introduction of a new category for 'translational' substances that convey changes in energy state to information. One intriguing example is hydrogen peroxide (H2 O2 ), which is a small, readily diffusible molecule. Produced during mitochondrial respiration, this reactive oxygen species, can mediate dynamic regulation of neuronal activity and transmitter release by activating inhibitory ATP-sensitive K(+) (KATP ) channels, as well as a class of excitatory non-selective cation channels, TRPM2. Studies using ex vivo guinea pig brain slices have revealed that activity-generated H2 O2 can act via KATP channels to inhibit dopamine release in dorsal striatum and dopamine neuron activity in the substantia nigra pars compacta. In sharp contrast, endogenously generated H2 O2 enhances the excitability of GABAergic projection neurons in the dorsal striatum and substantia nigra pars reticulata by activating TRPM2 channels. These studies suggest that the balance of excitation vs. inhibition produced in a given cell by metabolically generated H2 O2 will be dictated by the relative abundance of H2 O2 -sensitive ion channel targets that receive this translational signal.
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Affiliation(s)
- Christian R Lee
- Department of Neurosurgery, New York University School of Medicine, New York, NY, 10016, USA
| | - Jyoti C Patel
- Department of Neurosurgery, New York University School of Medicine, New York, NY, 10016, USA
| | - Brian O'Neill
- Department of Neurosurgery, New York University School of Medicine, New York, NY, 10016, USA.,Department of Psychiatry, New York University School of Medicine, New York, NY, 10016, USA
| | - Margaret E Rice
- Department of Neurosurgery, New York University School of Medicine, New York, NY, 10016, USA.,Department of Neuroscience and Physiology, New York University School of Medicine, New York, NY, 10016, USA
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422
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Jacques S, Ghesquière B, De Bock PJ, Demol H, Wahni K, Willems P, Messens J, Van Breusegem F, Gevaert K. Protein Methionine Sulfoxide Dynamics in Arabidopsis thaliana under Oxidative Stress. Mol Cell Proteomics 2015; 14:1217-29. [PMID: 25693801 DOI: 10.1074/mcp.m114.043729] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Indexed: 02/02/2023] Open
Abstract
Reactive oxygen species such as hydrogen peroxide can modify proteins via direct oxidation of their sulfur-containing amino acids, cysteine and methionine. Methionine oxidation, studied here, is a reversible posttranslational modification that is emerging as a mechanism by which proteins perceive oxidative stress and function in redox signaling. Identification of proteins with oxidized methionines is the first prerequisite toward understanding the functional effect of methionine oxidation on proteins and the biological processes in which they are involved. Here, we describe a proteome-wide study of in vivo protein-bound methionine oxidation in plants upon oxidative stress using Arabidopsis thaliana catalase 2 knock-out plants as a model system. We identified over 500 sites of oxidation in about 400 proteins and quantified the differences in oxidation between wild-type and catalase 2 knock-out plants. We show that the activity of two plant-specific glutathione S-transferases, GSTF9 and GSTT23, is significantly reduced upon oxidation. And, by sampling over time, we mapped the dynamics of methionine oxidation and gained new insights into this complex and dynamic landscape of a part of the plant proteome that is sculpted by oxidative stress.
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Affiliation(s)
- Silke Jacques
- From the Department of Medical Protein Research, VIB, B-9000 Ghent, Belgium, Department of Biochemistry, Ghent University, B-9000 Ghent, Belgium, Department of Plant Systems Biology, VIB, Technologiepark 927, B-9052 Ghent, Belgium, Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 927, B-9052 Ghent, Belgium
| | - Bart Ghesquière
- From the Department of Medical Protein Research, VIB, B-9000 Ghent, Belgium, Department of Biochemistry, Ghent University, B-9000 Ghent, Belgium
| | - Pieter-Jan De Bock
- From the Department of Medical Protein Research, VIB, B-9000 Ghent, Belgium, Department of Biochemistry, Ghent University, B-9000 Ghent, Belgium
| | - Hans Demol
- From the Department of Medical Protein Research, VIB, B-9000 Ghent, Belgium, Department of Biochemistry, Ghent University, B-9000 Ghent, Belgium
| | - Khadija Wahni
- VIB Structural Biology Research Center, Vrije Universiteit Brussel (VUB), B-1050 Brussels, Belgium, Brussels Center for Redox Biology, B-1050 Brussels, Belgium, Structural Biology Brussels, Vrije Universiteit Brussel, B-1050 Brussels, Belgium
| | - Patrick Willems
- From the Department of Medical Protein Research, VIB, B-9000 Ghent, Belgium, Department of Biochemistry, Ghent University, B-9000 Ghent, Belgium, Department of Plant Systems Biology, VIB, Technologiepark 927, B-9052 Ghent, Belgium, Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 927, B-9052 Ghent, Belgium
| | - Joris Messens
- VIB Structural Biology Research Center, Vrije Universiteit Brussel (VUB), B-1050 Brussels, Belgium, Brussels Center for Redox Biology, B-1050 Brussels, Belgium, Structural Biology Brussels, Vrije Universiteit Brussel, B-1050 Brussels, Belgium
| | - Frank Van Breusegem
- Department of Plant Systems Biology, VIB, Technologiepark 927, B-9052 Ghent, Belgium, Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 927, B-9052 Ghent, Belgium,
| | - Kris Gevaert
- From the Department of Medical Protein Research, VIB, B-9000 Ghent, Belgium, Department of Biochemistry, Ghent University, B-9000 Ghent, Belgium,
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423
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Tsiavaliaris G, Itel F, Hedfalk K, Al‐Samir S, Meier W, Gros G, Endeward V. Low CO
2
permeability of cholesterol‐containing liposomes detected by stopped‐flow fluorescence spectroscopy. FASEB J 2015; 29:1780-93. [DOI: 10.1096/fj.14-263988] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Accepted: 12/19/2014] [Indexed: 01/21/2023]
Affiliation(s)
- Georgios Tsiavaliaris
- Institut für Biophysikalische Chemie, Medizinische Hochschule HannoverHannoverGermany
| | - Fabian Itel
- Departement ChemieUniversität BaselBaselSwitzerland
| | - Kristina Hedfalk
- Department Chemistry & Molecular BiologyUniversity of GothenburgGöteborgSweden
| | - Samer Al‐Samir
- Institut für Molekular‐ und Zellphysiologie, AG Vegetative Physiologie, Medizinische Hochschule HannoverHannoverGermany
| | | | - Gerolf Gros
- Institut für Molekular‐ und Zellphysiologie, AG Vegetative Physiologie, Medizinische Hochschule HannoverHannoverGermany
| | - Volker Endeward
- Institut für Molekular‐ und Zellphysiologie, AG Vegetative Physiologie, Medizinische Hochschule HannoverHannoverGermany
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424
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Wu F, Sheng P, Tan J, Chen X, Lu G, Ma W, Heng Y, Lin Q, Zhu S, Wang J, Wang J, Guo X, Zhang X, Lei C, Wan J. Plasma membrane receptor-like kinase leaf panicle 2 acts downstream of the DROUGHT AND SALT TOLERANCE transcription factor to regulate drought sensitivity in rice. JOURNAL OF EXPERIMENTAL BOTANY 2015; 66:271-81. [PMID: 25385766 PMCID: PMC4265162 DOI: 10.1093/jxb/eru417] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Drought is a recurring climatic hazard that reduces the crop yields. To avoid the negative effects of drought on crop production, extensive efforts have been devoted to investigating the complex mechanisms of gene expression and signal transduction during drought stress. Receptor-like kinases (RLKs) play important roles in perceiving extracellular stimuli and activating downstream signalling responses. The rice genome contains >1100 RLK genes, of which only two are reported to function in drought stress. A leucine-rich repeat (LRR)-RLK gene named Leaf Panicle 2 (LP2) was previously found to be strongly expressed in leaves and other photosynthetic tissues, but its function remains unclear. In the present study, it was shown that the expression of LP2 was down-regulated by drought and abscisic acid (ABA). Transgenic plants overexpressing LP2 accumulated less H₂O₂, had more open stomata in leaves, and showed hypersensitivity to drought stress. Further investigation revealed that transcription of LP2 was directly regulated by the zinc finger transcription factor DROUGHT AND SALT TOLERANCE (DST). In addition, LP2 was identified as a functional kinase localized to the plasma membrane and interacted with the drought-responsive aquaporin proteins OsPIP1; 1, OsPIP1; 3, and OsPIP2; 3. Thus, the findings provided evidence that the LRR-RLK LP2, transcriptionally regulated by the drought-related transcription factor DST, served as a negative regulator in drought response.
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Affiliation(s)
- Fuqing Wu
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Peike Sheng
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Junjie Tan
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Xiuling Chen
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Guangwen Lu
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China National Key Laboratory for Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Weiwei Ma
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Yueqin Heng
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Qibing Lin
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Shanshan Zhu
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Jiulin Wang
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Jie Wang
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Xiuping Guo
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Xin Zhang
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Cailin Lei
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Jianmin Wan
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China National Key Laboratory for Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing 210095, PR China
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425
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Yang NJ, Hinner MJ. Getting across the cell membrane: an overview for small molecules, peptides, and proteins. Methods Mol Biol 2015; 1266:29-53. [PMID: 25560066 DOI: 10.1007/978-1-4939-2272-7_3] [Citation(s) in RCA: 447] [Impact Index Per Article: 49.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The ability to efficiently access cytosolic proteins is desired in both biological research and medicine. However, targeting intracellular proteins is often challenging, because to reach the cytosol, exogenous molecules must first traverse the cell membrane. This review provides a broad overview of how certain molecules are thought to cross this barrier, and what kinds of approaches are being made to enhance the intracellular delivery of those that are impermeable. We first discuss rules that govern the passive permeability of small molecules across the lipid membrane, and mechanisms of membrane transport that have evolved in nature for certain metabolites, peptides, and proteins. Then, we introduce design strategies that have emerged in the development of small molecules and peptides with improved permeability. Finally, intracellular delivery systems that have been engineered for protein payloads are surveyed. Viewpoints from varying disciplines have been brought together to provide a cohesive overview of how the membrane barrier is being overcome.
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Affiliation(s)
- Nicole J Yang
- Department of Chemical Engineering, Massachusetts Institute of Technology, 500 Main Street, Cambridge, MA, 02139, USA,
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426
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Rieger S, Zhao H, Martin P, Abe K, Lisse TS. The role of nuclear hormone receptors in cutaneous wound repair. Cell Biochem Funct 2014; 33:1-13. [PMID: 25529612 DOI: 10.1002/cbf.3086] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2014] [Revised: 11/06/2014] [Accepted: 11/14/2014] [Indexed: 12/12/2022]
Abstract
The cutaneous wound repair process involves balancing a dynamic series of events ranging from inflammation, oxidative stress, cell migration, proliferation, survival and differentiation. A complex series of secreted trophic factors, cytokines, surface and intracellular proteins are expressed in a temporospatial manner to restore skin integrity after wounding. Impaired initiation, maintenance or termination of the tissue repair processes can lead to perturbed healing, necrosis, fibrosis or even cancer. Nuclear hormone receptors (NHRs) in the cutaneous environment regulate tissue repair processes such as fibroplasia and angiogenesis. Defects in functional NHRs and their ligands are associated with the clinical phenotypes of chronic non-healing wounds and skin endocrine disorders. The functional relationship between NHRs and skin niche cells such as epidermal keratinocytes and dermal fibroblasts is pivotal for successful wound closure and permanent repair. The aim of this review is to delineate the cutaneous effects and cross-talk of various nuclear receptors upon injury towards functional tissue restoration.
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Affiliation(s)
- Sandra Rieger
- Center for Regenerative Biology and Medicine, MDI Biological Laboratory, Salisbury Cove, ME, USA
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427
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Scalera V, Gena P, Mastrodonato M, Kitagawa Y, Carulli S, Svelto M, Calamita G. Functional reconstitution of a rice aquaporin water channel, PIP1;1, by a micro-batchwise methodology. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2014; 85:78-84. [PMID: 25394803 DOI: 10.1016/j.plaphy.2014.10.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2014] [Accepted: 10/29/2014] [Indexed: 05/08/2023]
Abstract
Assessing the selectivity, regulation and physiological relevance of aquaporin membrane channels (AQPs)requires structural and functional studies of wild type and modified proteins. In particular, when characterizing their transport properties, reconstitution in isolation from native cellular or membrane processes is of pivotal importance. Here, we describe rapid and efficient incorporation of OsPIP1;1, a rice AQP, in liposomes at analytical scale. PIP1;1 was produced as a histidine-tagged form, 10 His-OsPIP1;1, in an Escherichia coli-based expression system. The recombinant protein was purified by affinity chromatography and incorporated into liposomes by a micro-batchwise technology using egg-yolk phospholipids and the non-polar Amberlite resin. PIP1;1 proteoliposomes and control empty liposomes had good size homogeneity as seen by quasi-elastic light scattering and electron microscopy analyses. By stopped-flow light scattering, indicating correct protein folding of the incorporated protein, the osmotic water permeability exhibited by the PIP1;1 proteoliposomes was markedly higher than empty liposomes. Functional reconstitution of OsPIP1;1 was further confirmed by the low Arrhenius activation energy (3.37 kcal/mol) and sensitivity to HgCl2, a known AQP blocker, of the PIP1;1-mediated osmotic water conductance. These results provide a valuable contribution in fully elucidating the regulation and water-conducting property of PIP1;1, an AQP that needs to hetero-multimerize with AQPs of the PIP2 subgroupto reach the native plasma membrane and play its role. The micro-batchwise methodology is suitable for the functional reconstitution of whichever AQPs and other membrane transport proteins.
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428
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Srivastava AK, Penna S, Nguyen DV, Tran LSP. Multifaceted roles of aquaporins as molecular conduits in plant responses to abiotic stresses. Crit Rev Biotechnol 2014; 36:389-98. [PMID: 25430890 DOI: 10.3109/07388551.2014.973367] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abiotic stress has become a challenge to food security due to occurrences of climate change and environmental degradation. Plants initiate molecular, cellular and physiological changes to respond and adapt to various types of abiotic stress. Understanding of plant response mechanisms will aid in strategies aimed at improving stress tolerance in crop plants. One of the most common and early symptoms associated with these stresses is the disturbance in plant-water homeostasis, which is regulated by a group of proteins called "aquaporins". Aquaporins constitute a small family of proteins which are classified further on the basis of their localization, such as plasma membrane intrinsic proteins, tonoplast intrinsic proteins, nodulin26-like intrinsic proteins (initially identified in symbiosomes of legumes but also found in the plasma membrane and endoplasmic reticulum), small basic intrinsic proteins localized in ER (endoplasmic reticulum) and X intrinsic proteins present in plasma membrane. Apart from water, aquaporins are also known to transport CO2, H2O2, urea, ammonia, silicic acid, arsenite and wide range of small uncharged solutes. Besides, aquaporins also function to modulate abiotic stress-induced signaling. Such kind of versatile functions has made aquaporins a suitable candidate for development of transgenic plants with increased tolerance toward different abiotic stress. Toward this endeavor, the present review describes the versatile functions of aquaporins in water uptake, nutrient balancing, long-distance signal transfer, nutrient/heavy metal acquisition and seed development. Various functional genomic studies showing the potential of specific aquaporin isoforms for enhancing plant abiotic stress tolerance are summarized and future research directions are given to design stress-tolerant crops.
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Affiliation(s)
- Ashish Kumar Srivastava
- a Plant Stress Physiology and Biotechnology Section, Nuclear Agriculture & Biotechnology Division, Bhabha Atomic Research Centre , Mumbai , India
| | - Suprasanna Penna
- a Plant Stress Physiology and Biotechnology Section, Nuclear Agriculture & Biotechnology Division, Bhabha Atomic Research Centre , Mumbai , India
| | - Dong Van Nguyen
- b National Key Laboratory for Plant Cell Technology , Agricultural Genetics Institute, Vietnamese Academy of Agricultural Science , Hanoi , Vietnam , and
| | - Lam-Son Phan Tran
- c Signaling Pathway Research Unit , RIKEN Center for Sustainable Resource Science , Yokohama , Kanagawa , Japan
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429
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Karmakar T, Balasubramanian S. Elucidating the interaction of H 2 O 2 with polar amino acids – Quantum chemical calculations. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2014.08.041] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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430
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Jadhav VS, Krause KH, Singh SK. HIV-1 Tat C modulates NOX2 and NOX4 expressions through miR-17 in a human microglial cell line. J Neurochem 2014; 131:803-15. [PMID: 25146963 DOI: 10.1111/jnc.12933] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Revised: 08/12/2014] [Accepted: 08/14/2014] [Indexed: 12/22/2022]
Abstract
HIV-1 invades CNS in the early course of infection, which can lead to the cascade of neuroinflammation. NADPH oxidases (NOXs) are the major producers of reactive oxygen species (ROS), which play important roles during pathogenic insults. The molecular mechanism of ROS generation via microRNA-mediated pathway in human microglial cells in response to HIV-1 Tat protein has been demonstrated in this study. Over-expression and knockdown of microRNAs, luciferase reporter assay, and site-directed mutagenesis are main molecular techniques used in this study. A significant reduction in miR-17 levels and increased NOX2, NOX4 expression levels along with ROS production were observed in human microglial cells upon HIV-1 Tat C exposure. The validation of NOX2 and NOX4 as direct targets of miR-17 was done by luciferase reporter assay. The over-expression and knockdown of miR-17 in human microglial cells showed the direct role of miR-17 in regulation of NOX2, NOX4 expression and intracellular ROS generation. We demonstrated the regulatory role of cellular miR-17 in ROS generation through over-expression and knockdown of miR-17 in human microglial cells exposed to HIV-1 Tat C protein. Activated microglial cells mediated neuroinflammatory events are observed in HIV-associated neurological disorders. The reduction in miR-17 levels was observed in microglial cells exposed to HIV-1 Tat C protein. miR-17 regulated the expression of NOX2 and NOX4, which in turn regulated the reactive oxygen species (ROS) production in microglial cells. Increased ROS production led to the activation of microglial cells and increased cytokine production. This study thus demonstrated a novel miR-17-mediated regulatory pathway of ROS production in microglial cells. HMC3 = human microglia clone 3 cell lines.
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Affiliation(s)
- Vaishnavi Sunil Jadhav
- Laboratory of Neurovirology and Inflammation Biology, CSIR-Centre for Cellular and Molecular Biology (CCMB), Hyderabad, India
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431
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Paeonol attenuates cigarette smoke-induced lung inflammation by inhibiting ROS-sensitive inflammatory signaling. Mediators Inflamm 2014; 2014:651890. [PMID: 25165413 PMCID: PMC4137546 DOI: 10.1155/2014/651890] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Revised: 07/14/2014] [Accepted: 07/15/2014] [Indexed: 12/20/2022] Open
Abstract
Cigarette smoking causes persistent lung inflammation that is mainly regulated by redox-sensitive pathways. We have previously reported that cigarette smoke (CS) activates reactive oxygen species- (ROS-) sensitive mitogen-activated protein kinases (MAPKs)/nuclear factor-κB (NF-κB) signaling leading to induction of lung inflammation. Paeonol, the main phenolic compound present in the Chinese herb Paeonia suffruticosa, has antioxidant and anti-inflammatory properties. However, whether paeonol has similar beneficial effects against CS-induced lung inflammation remains unclear. Using a murine model, we showed that chronic CS exposure for 4 weeks caused pulmonary inflammatory infiltration, increased lung vascular permeability, elevated lung levels of chemokines, cytokines, and 4-hydroxynonenal (an oxidative stress biomarker), and induced lung inflammation; all of these CS-induced events were suppressed by chronic treatment with paeonol. Using human bronchial epithelial cells (HBECs), we demonstrated that cigarette smoke extract (CSE) sequentially increased extracellular and intracellular levels of ROS, activated the MAPKs/NF-κB signaling, and induced interleukin-8 (IL-8); all these CSE-induced events were inhibited by paeonol pretreatment. Our findings suggest a novel role for paeonol in alleviating the oxidative stress and lung inflammation induced by chronic CS exposure in vivo and in suppressing CSE-induced IL-8 in vitro via its antioxidant function and an inhibition of the MAPKs/NF-κB signaling.
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432
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Sewelam N, Jaspert N, Van Der Kelen K, Tognetti VB, Schmitz J, Frerigmann H, Stahl E, Zeier J, Van Breusegem F, Maurino VG. Spatial H2O2 signaling specificity: H2O2 from chloroplasts and peroxisomes modulates the plant transcriptome differentially. MOLECULAR PLANT 2014; 7:1191-210. [PMID: 24908268 DOI: 10.1093/mp/ssu070] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Hydrogen peroxide (H2O2) operates as a signaling molecule in eukaryotes, but the specificity of its signaling capacities remains largely unrevealed. Here, we analyzed whether a moderate production of H2O2 from two different plant cellular compartments has divergent effects on the plant transcriptome. Arabidopsis thaliana overexpressing glycolate oxidase in the chloroplast (Fahnenstich et al., 2008; Balazadeh et al., 2012) and plants deficient in peroxisomal catalase (Queval et al., 2007; Inzé et al., 2012) were grown under non-photorespiratory conditions and then transferred to photorespiratory conditions to foster the production of H2O2 in both organelles. We show that H2O2 originating in a specific organelle induces two types of responses: one that integrates signals independently from the subcellular site of H2O2 production and another that is dependent on the H2O2 production site. H2O2 produced in peroxisomes induces transcripts involved in protein repair responses, while H2O2 produced in chloroplasts induces early signaling responses, including transcription factors and biosynthetic genes involved in production of secondary signaling messengers. There is a significant bias towards the induction of genes involved in responses to wounding and pathogen attack by chloroplastic-produced H2O2, including indolic glucosinolates-, camalexin-, and stigmasterol-biosynthetic genes. These transcriptional responses were accompanied by the accumulation of 4-methoxy-indol-3-ylmethyl glucosinolate and stigmasterol.
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Affiliation(s)
- Nasser Sewelam
- Institut of Developmental and Molecular Biology of Plants, Plant Molecular Physiology and Biotechnology Group, Heinrich-Heine-Universität, Universitätsstraße 1, 40225 Düsseldorf, Germany Botany Department, Faculty of Science, Tanta University, 31527, Tanta, Egypt
| | - Nils Jaspert
- Institut of Developmental and Molecular Biology of Plants, Plant Molecular Physiology and Biotechnology Group, Heinrich-Heine-Universität, Universitätsstraße 1, 40225 Düsseldorf, Germany
| | - Katrien Van Der Kelen
- Department of Plant Systems Biology, VIB, and Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 927, B-9052, Gent, Belgium
| | - Vanesa B Tognetti
- Department of Plant Systems Biology, VIB, and Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 927, B-9052, Gent, Belgium Present address: Mendel Centre for Plant Genomics and Proteomics, CEITEC-Central European Institute of Technology, Masaryk University, Kamenice 5, CZ-62500 Brno, Czech Republic
| | - Jessica Schmitz
- Institut of Developmental and Molecular Biology of Plants, Plant Molecular Physiology and Biotechnology Group, Heinrich-Heine-Universität, Universitätsstraße 1, 40225 Düsseldorf, Germany
| | - Henning Frerigmann
- Botanical Institute, Cologne Biocenter, University of Cologne, 50674 Cologne, Germany Cluster of Excellence on Plant Sciences (CEPLAS), 40225 Düsseldorf and 50674 Cologne, Germany
| | - Elia Stahl
- Molecular Ecophysiology of Plants, Heinrich-Heine-Universität, Universitätsstraße 1, 40225 Düsseldorf, Germany
| | - Jürgen Zeier
- Cluster of Excellence on Plant Sciences (CEPLAS), 40225 Düsseldorf and 50674 Cologne, Germany Molecular Ecophysiology of Plants, Heinrich-Heine-Universität, Universitätsstraße 1, 40225 Düsseldorf, Germany
| | - Frank Van Breusegem
- Department of Plant Systems Biology, VIB, and Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 927, B-9052, Gent, Belgium
| | - Veronica G Maurino
- Institut of Developmental and Molecular Biology of Plants, Plant Molecular Physiology and Biotechnology Group, Heinrich-Heine-Universität, Universitätsstraße 1, 40225 Düsseldorf, Germany Cluster of Excellence on Plant Sciences (CEPLAS), 40225 Düsseldorf and 50674 Cologne, Germany
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433
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Chaumont F, Tyerman SD. Aquaporins: highly regulated channels controlling plant water relations. PLANT PHYSIOLOGY 2014; 164:1600-18. [PMID: 24449709 PMCID: PMC3982727 DOI: 10.1104/pp.113.233791] [Citation(s) in RCA: 345] [Impact Index Per Article: 34.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Accepted: 01/19/2014] [Indexed: 05/18/2023]
Abstract
Plant growth and development are dependent on tight regulation of water movement. Water diffusion across cell membranes is facilitated by aquaporins that provide plants with the means to rapidly and reversibly modify water permeability. This is done by changing aquaporin density and activity in the membrane, including posttranslational modifications and protein interaction that act on their trafficking and gating. At the whole organ level aquaporins modify water conductance and gradients at key "gatekeeper" cell layers that impact on whole plant water flow and plant water potential. In this way they may act in concert with stomatal regulation to determine the degree of isohydry/anisohydry. Molecular, physiological, and biophysical approaches have demonstrated that variations in root and leaf hydraulic conductivity can be accounted for by aquaporins but this must be integrated with anatomical considerations. This Update integrates these data and emphasizes the central role played by aquaporins in regulating plant water relations.
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Affiliation(s)
| | - Stephen D. Tyerman
- Institut des Sciences de la Vie, Université catholique de Louvain, Croix du Sud 4–L7.07.14, B–1348 Louvain-la-Neuve, Belgium (F.C.); and
- Australian Research Council Centre of Excellence in Plant Energy Biology, Waite Research Institute, School of Agriculture, Food, and Wine, University of Adelaide, Waite Campus PMB 1, Glen Osmond, South Australia 5064, Australia (S.D.T.)
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434
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Sies H. Role of metabolic H2O2 generation: redox signaling and oxidative stress. J Biol Chem 2014; 289:8735-41. [PMID: 24515117 DOI: 10.1074/jbc.r113.544635] [Citation(s) in RCA: 485] [Impact Index Per Article: 48.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Hydrogen peroxide, the nonradical 2-electron reduction product of oxygen, is a normal aerobic metabolite occurring at about 10 nm intracellular concentration. In liver, it is produced at 50 nmol/min/g of tissue, which is about 2% of total oxygen uptake at steady state. Metabolically generated H2O2 emerged from recent research as a central hub in redox signaling and oxidative stress. Upon generation by major sources, the NADPH oxidases or Complex III of the mitochondrial respiratory chain, H2O2 is under sophisticated fine control of peroxiredoxins and glutathione peroxidases with their backup systems as well as by catalase. Of note, H2O2 is a second messenger in insulin signaling and in several growth factor-induced signaling cascades. H2O2 transport across membranes is facilitated by aquaporins, denoted as peroxiporins. Specialized protein cysteines operate as redox switches using H2O2 as thiol oxidant, making this reactive oxygen species essential for poising the set point of the redox proteome. Major processes including proliferation, differentiation, tissue repair, inflammation, circadian rhythm, and aging use this low molecular weight oxygen metabolite as signaling compound.
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Affiliation(s)
- Helmut Sies
- From the From the Institute of Biochemistry and Molecular Biology I, and
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435
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Almasalmeh A, Krenc D, Wu B, Beitz E. Structural determinants of the hydrogen peroxide permeability of aquaporins. FEBS J 2013; 281:647-56. [PMID: 24286224 DOI: 10.1111/febs.12653] [Citation(s) in RCA: 124] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Revised: 11/24/2013] [Accepted: 11/25/2013] [Indexed: 12/27/2022]
Abstract
Aquaporins (AQP) conduct small, uncharged molecules, such as water (orthodox AQPs), ammonia (aquaammoniaporins) or glycerol (aquaglyceroporins). The physiological functions of AQPs are involved in osmotic volume regulation or the transport of biochemical precursors and metabolic waste products. The recent identification of hydrogen peroxide (H₂O₂) as a permeant of certain AQPs suggests additional roles in mitigating oxidative stress or enabling paracrine H₂O₂ signalling. Yet, an analysis of the structural requirements of the H₂O₂ permeability of AQPs is missing. We subjected a representative set of wild-type and mutant AQPs to a newly established quantitative phenotypic assay. We confirmed high H₂O₂ permeability of the human aquaammoniaporin AQP8 and found intermediate H₂O₂ permeability of the prototypical orthodox water channel AQP1 from the rat. Differences from an earlier report showing an absence of H₂O₂ permeability of human AQP1 can be explained by expression levels. By generating point mutations in the selectivity filter of rat orthodox aquaporin AQP1, we established a correlation of H₂O₂ permeability primarily with water permeability and secondarily with the pore diameter. Even the narrowest pore of the test set (i.e. rat orthodox aquaporin AQP1 H180F with a pore diameter smaller than that of natural orthodox AQPs) conducted water and H₂O₂. We further found that H₂O₂ permeability of the aquaglyceroporin from the malaria parasite Plasmodium falciparum was lower despite its wider pore diameter. The data suggest that all water-permeable AQPs are H₂O₂ channels, yet H₂O₂ permeability varies with the isoform. Thus, generally, AQPs must be considered as putative players in situations of oxidative stress (e.g. in Plasmodium-infected red blood cells, immune cells, the cardiovascular system or cells expressing AQP8 in their mitochondria).
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Affiliation(s)
- Abdulnasser Almasalmeh
- Department of Pharmaceutical and Medicinal Chemistry, Christian-Albrechts-University of Kiel, Germany
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436
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Perez Di Giorgio J, Soto G, Alleva K, Jozefkowicz C, Amodeo G, Muschietti JP, Ayub ND. Prediction of Aquaporin Function by Integrating Evolutionary and Functional Analyses. J Membr Biol 2013; 247:107-25. [DOI: 10.1007/s00232-013-9618-8] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2013] [Accepted: 11/09/2013] [Indexed: 01/08/2023]
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