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Arnoldt S, Pourdanandeh M, Spikkeland I, Andersson MX, Selander E. Mass spectroscopy reveals compositional differences in copepodamides from limnic and marine copepods. Sci Rep 2024; 14:3147. [PMID: 38326374 PMCID: PMC10850141 DOI: 10.1038/s41598-024-53247-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Accepted: 01/30/2024] [Indexed: 02/09/2024] Open
Abstract
Marine copepods, the most abundant animals in the global ocean, imprint their surrounding waters with chemical cues, called copepodamides. Copepodamides induce defensive traits such as toxin production, bioluminescence, and colony size plasticity in a variety of marine phytoplankton. The role of copepodamides in freshwater ecosystems is, however, unknown. Here we report the consistent presence of copepodamides in copepods from six Swedish freshwater lakes. Copepodamide concentrations in freshwater copepods are similar to those of marine copepods, around 0.1 ppt of dry mass in millimetre sized individuals. The composition substantially overlaps with marine copepodamides but is also distinctly different. Marine copepods commonly contain both subgroups of copepodamides, the copepodamides (CA) and the dihydro-copepodamides (dhCA), whereas freshwater copepods are dominated by the dhCAs. Taxonomic groups had consistent copepodamide profiles across sampling sites and timepoints, supporting the presence of species-specific copepodamide signatures. We describe 10 new copepodamide structures, four of which were found exclusively in freshwater copepods. The presence of copepodamides in limnic copepods also warrants studies into their potential function as predator alarm cues in freshwater systems.
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Affiliation(s)
- Sina Arnoldt
- Department of Marine Sciences, University of Gothenburg, Medicinaregatan 7B, 41390, Gothenburg, Sweden
| | - Milad Pourdanandeh
- Department of Marine Sciences, University of Gothenburg, Medicinaregatan 7B, 41390, Gothenburg, Sweden
| | - Ingvar Spikkeland
- Department of Haldenvassdragets Kanalmuseum, Østfold Museum Foundation, Gamlebygata 8, 1721, Sarpsborg, Østfold, Norway
| | - Mats X Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, Medicinaregatan 7B, 41390, Gothenburg, Sweden
| | - Erik Selander
- Department of Biology-Aquatic Ecology, Lund University, Sölvegatan 37, 22362, Lund, Sweden.
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Waszczak C, Yarmolinsky D, Leal Gavarrón M, Vahisalu T, Sierla M, Zamora O, Carter R, Puukko T, Sipari N, Lamminmäki A, Durner J, Ernst D, Winkler JB, Paulin L, Auvinen P, Fleming AJ, Andersson MX, Kollist H, Kangasjärvi J. Synthesis and import of GDP-l-fucose into the Golgi affect plant-water relations. New Phytol 2024; 241:747-763. [PMID: 37964509 DOI: 10.1111/nph.19378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Accepted: 10/13/2023] [Indexed: 11/16/2023]
Abstract
Land plants evolved multiple adaptations to restrict transpiration. However, the underlying molecular mechanisms are not sufficiently understood. We used an ozone-sensitivity forward genetics approach to identify Arabidopsis thaliana mutants impaired in gas exchange regulation. High water loss from detached leaves and impaired decrease of leaf conductance in response to multiple stomata-closing stimuli were identified in a mutant of MURUS1 (MUR1), an enzyme required for GDP-l-fucose biosynthesis. High water loss observed in mur1 was independent from stomatal movements and instead could be linked to metabolic defects. Plants defective in import of GDP-l-Fuc into the Golgi apparatus phenocopied the high water loss of mur1 mutants, linking this phenotype to Golgi-localized fucosylation events. However, impaired fucosylation of xyloglucan, N-linked glycans, and arabinogalactan proteins did not explain the aberrant water loss of mur1 mutants. Partial reversion of mur1 water loss phenotype by borate supplementation and high water loss observed in boron uptake mutants link mur1 gas exchange phenotypes to pleiotropic consequences of l-fucose and boron deficiency, which in turn affect mechanical and morphological properties of stomatal complexes and whole-plant physiology. Our work emphasizes the impact of fucose metabolism and boron uptake on plant-water relations.
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Affiliation(s)
- Cezary Waszczak
- Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, Viikki Plant Science Centre, University of Helsinki, FI-00014, Helsinki, Finland
| | | | - Marina Leal Gavarrón
- Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, Viikki Plant Science Centre, University of Helsinki, FI-00014, Helsinki, Finland
| | - Triin Vahisalu
- Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, Viikki Plant Science Centre, University of Helsinki, FI-00014, Helsinki, Finland
| | - Maija Sierla
- Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, Viikki Plant Science Centre, University of Helsinki, FI-00014, Helsinki, Finland
| | - Olena Zamora
- Institute of Technology, University of Tartu, 50411, Tartu, Estonia
| | - Ross Carter
- Sainsbury Laboratory, University of Cambridge, CB2 1LR, Cambridge, UK
| | - Tuomas Puukko
- Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, Viikki Plant Science Centre, University of Helsinki, FI-00014, Helsinki, Finland
| | - Nina Sipari
- Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, Viikki Plant Science Centre, University of Helsinki, FI-00014, Helsinki, Finland
- Viikki Metabolomics Unit, Faculty of Biological and Environmental Sciences, University of Helsinki, FI-00014, Helsinki, Finland
| | - Airi Lamminmäki
- Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, Viikki Plant Science Centre, University of Helsinki, FI-00014, Helsinki, Finland
| | - Jörg Durner
- Institute of Biochemical Plant Pathology, Helmholtz Zentrum München, German Research Center for Environmental Health, 85764, Neuherberg, Germany
| | - Dieter Ernst
- Institute of Biochemical Plant Pathology, Helmholtz Zentrum München, German Research Center for Environmental Health, 85764, Neuherberg, Germany
| | - J Barbro Winkler
- Research Unit Environmental Simulation, Helmholtz Zentrum München, German Research Center for Environmental Health, 85764, Neuherberg, Germany
| | - Lars Paulin
- Institute of Biotechnology, University of Helsinki, FI-00014, Helsinki, Finland
| | - Petri Auvinen
- Institute of Biotechnology, University of Helsinki, FI-00014, Helsinki, Finland
| | - Andrew J Fleming
- School of Biosciences, University of Sheffield, S10 2TN, Sheffield, UK
| | - Mats X Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, SE-405 30, Gothenburg, Sweden
| | - Hannes Kollist
- Institute of Technology, University of Tartu, 50411, Tartu, Estonia
| | - Jaakko Kangasjärvi
- Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, Viikki Plant Science Centre, University of Helsinki, FI-00014, Helsinki, Finland
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Sjöbom U, Andersson MX, Pivodic A, Lund AM, Vanpee M, Hansen-Pupp I, Ley D, Wackernagel D, Sävman K, Smith LEH, Löfqvist C, Hellström A, Nilsson AK. Modification of serum fatty acids in preterm infants by parenteral lipids and enteral docosahexaenoic acid/arachidonic acid: A secondary analysis of the Mega Donna Mega trial. Clin Nutr 2023; 42:962-971. [PMID: 37120902 PMCID: PMC10512593 DOI: 10.1016/j.clnu.2023.04.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 04/13/2023] [Accepted: 04/14/2023] [Indexed: 05/02/2023]
Abstract
BACKGROUND & AIM Preterm infants risk deficits of long-chain polyunsaturated fatty acids (LCPUFAs) that may contribute to morbidities and hamper neurodevelopment. We aimed to determine longitudinal serum fatty acid profiles in preterm infants and how the profiles are affected by enteral and parenteral lipid sources. METHODS Cohort study analyzing fatty acid data from the Mega Donna Mega study, a randomized control trial with infants born <28 weeks of gestation (n = 204) receiving standard nutrition or daily enteral lipid supplementation with arachidonic acid (AA):docosahexaenoic acid (DHA) (100:50 mg/kg/day). Infants received an intravenous lipid emulsion containing olive oil:soybean oil (4:1). Infants were followed from birth to postmenstrual age 40 weeks. Levels of 31 different fatty acids from serum phospholipids were determined by GC-MS and reported in relative (mol%) and absolute concentration (μmol l-1) units. RESULTS Higher parenteral lipid administration resulted in lower serum proportion of AA and DHA relative to other fatty acids during the first 13 weeks of life (p < 0.001 for the 25th vs the 75th percentile). The enteral AA:DHA supplement increased the target fatty acids with little impact on other fatty acids. The absolute concentration of total phospholipid fatty acids changed rapidly in the first weeks of life, peaking at day 3, median (Q1-Q3) 4452 (3645-5466) μmol l-1, and was positively correlated to the intake of parenteral lipids. Overall, infants displayed common fatty acid trajectories over the study period. However, remarkable differences in fatty acid patterns were observed depending on whether levels were expressed in relative or absolute units. For example, the relative levels of many LCPUFAs, including DHA and AA, declined rapidly after birth while their absolute concentrations increased in the first week of life. For DHA, absolute levels were significantly higher compared to cord blood from day 1 until postnatal week 16 (p < 0.001). For AA, absolute postnatal levels were lower compared to cord blood from week 4 throughout the study period (p < 0.05). CONCLUSIONS Our data show that parenteral lipids aggravate the postnatal loss of LCPUFAs seen in preterm infants and that serum AA available for accretion is below that in utero. Further research is needed to establish optimal postnatal fatty acid supplementation and profiles in extremely preterm infants to promote development and long-term health. CLINICAL TRIAL REGISTRY ClinicalTrials.gov, identifier: NCT03201588.
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Affiliation(s)
- Ulrika Sjöbom
- Section for Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden; Learning and Leadership for Health Care Professionals at the Institute of Health and Care Science at Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden.
| | - Mats X Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden.
| | - Aldina Pivodic
- Section for Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
| | - Anna-My Lund
- Lund University, Skåne University Hospital, Department of Clinical Sciences Lund, Pediatrics, Lund, Sweden.
| | - Mireille Vanpee
- Department of Women's and Children's Health, Karolinska Institutet and Karolinska University Hospital, Stockholm, Sweden.
| | - Ingrid Hansen-Pupp
- Lund University, Skåne University Hospital, Department of Clinical Sciences Lund, Pediatrics, Lund, Sweden.
| | - David Ley
- Lund University, Skåne University Hospital, Department of Clinical Sciences Lund, Pediatrics, Lund, Sweden.
| | - Dirk Wackernagel
- Department of Neonatology, Karolinska University Hospital and Institute, Astrid Lindgrens Children's Hospital, Stockholm, Sweden.
| | - Karin Sävman
- Department of Pediatrics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden; Region Västra Götaland, Department of Neonatology, The Queen Silvia Children's Hospital, Sahlgrenska University Hospital, Gothenburg, Sweden.
| | - Lois E H Smith
- The Department of Ophthalmology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA.
| | - Chatarina Löfqvist
- Section for Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden; Learning and Leadership for Health Care Professionals at the Institute of Health and Care Science at Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden.
| | - Ann Hellström
- Section for Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
| | - Anders K Nilsson
- Section for Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
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Lindsay WR, Mendonça R, Slight MW, Prager M, Andersson MX, Mundy NI, Andersson S. Seasonal but not sex-biased gene expression of the carotenoid ketolase, CYP2J19, in the sexually dichromatic southern red bishop ( Euplectes orix). R Soc Open Sci 2022. [PMID: 35937912 DOI: 10.5061/dryad.ht76hdrjg] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Intense red colours in birds are often owing to ketocarotenoids (KCs). In many land birds, KCs are oxidized from dietary yellow precursors, presumably by the avian carotenoid ketolase CYP2J19, the regulation and constraints of which have important implications for condition-dependence and honest signalling of carotenoid colour displays. We investigated hepatic CYP2J19 gene expression in the seasonally and sexually dichromatic southern red bishop (Euplectes orix) in relation to season, sex, progression of the prenuptial moult, testis size, body condition, redness and circulating sex steroids. A coloration function of CYP2J19 is supported by a seasonal upregulation prior to and during the carotenoid-depositing stage of the male prenuptial moult. However, CYP2J19 expression was similarly high in females (which do not moult prenuptially), and remained high in males after moult, suggesting additional or alternative roles of hepatic CYP2J19 or its products, such as detoxification or antioxidant functions. In males, the CYP2J19 upregulation preceded and was unrelated to the rise in plasma testosterone, but was correlated with androstenedione, probably of adrenal origin and compatible with luteinizing hormone-induced and (in females) oestrogen-suppressed moult. Finally, contrary to ideas that carotenoid ketolation rate mediates honest signalling of male quality, CYP2J19 expression was not related to plumage redness or male body condition.
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Affiliation(s)
- Willow R Lindsay
- Department of Biological and Environmental Sciences, University of Gothenburg, Medicinaregatan 18, SE-413 -90 Gothenburg, Sweden
| | - Rute Mendonça
- Department of Biological and Environmental Sciences, University of Gothenburg, Medicinaregatan 18, SE-413 -90 Gothenburg, Sweden
| | - Mathilda Waleij Slight
- Department of Biological and Environmental Sciences, University of Gothenburg, Medicinaregatan 18, SE-413 -90 Gothenburg, Sweden
| | - Maria Prager
- Department of Ecology, Environment and Plant Sciences, University of Stockholm, 10691 Stockholm, Sweden
| | - Mats X Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, Medicinaregatan 18, SE-413 -90 Gothenburg, Sweden
| | - Nicholas I Mundy
- Department of Zoology, University of Cambridge, Cambridge CB2 3EJ, UK
| | - Staffan Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, Medicinaregatan 18, SE-413 -90 Gothenburg, Sweden
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5
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Lindsay WR, Mendonça R, Slight MW, Prager M, Andersson MX, Mundy NI, Andersson S. Seasonal but not sex-biased gene expression of the carotenoid ketolase, CYP2J19, in the sexually dichromatic southern red bishop ( Euplectes orix). R Soc Open Sci 2022. [PMID: 35937912 DOI: 10.6084/m9.figshare.c.6114863] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Intense red colours in birds are often owing to ketocarotenoids (KCs). In many land birds, KCs are oxidized from dietary yellow precursors, presumably by the avian carotenoid ketolase CYP2J19, the regulation and constraints of which have important implications for condition-dependence and honest signalling of carotenoid colour displays. We investigated hepatic CYP2J19 gene expression in the seasonally and sexually dichromatic southern red bishop (Euplectes orix) in relation to season, sex, progression of the prenuptial moult, testis size, body condition, redness and circulating sex steroids. A coloration function of CYP2J19 is supported by a seasonal upregulation prior to and during the carotenoid-depositing stage of the male prenuptial moult. However, CYP2J19 expression was similarly high in females (which do not moult prenuptially), and remained high in males after moult, suggesting additional or alternative roles of hepatic CYP2J19 or its products, such as detoxification or antioxidant functions. In males, the CYP2J19 upregulation preceded and was unrelated to the rise in plasma testosterone, but was correlated with androstenedione, probably of adrenal origin and compatible with luteinizing hormone-induced and (in females) oestrogen-suppressed moult. Finally, contrary to ideas that carotenoid ketolation rate mediates honest signalling of male quality, CYP2J19 expression was not related to plumage redness or male body condition.
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Affiliation(s)
- Willow R Lindsay
- Department of Biological and Environmental Sciences, University of Gothenburg, Medicinaregatan 18, SE-413 -90 Gothenburg, Sweden
| | - Rute Mendonça
- Department of Biological and Environmental Sciences, University of Gothenburg, Medicinaregatan 18, SE-413 -90 Gothenburg, Sweden
| | - Mathilda Waleij Slight
- Department of Biological and Environmental Sciences, University of Gothenburg, Medicinaregatan 18, SE-413 -90 Gothenburg, Sweden
| | - Maria Prager
- Department of Ecology, Environment and Plant Sciences, University of Stockholm, 10691 Stockholm, Sweden
| | - Mats X Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, Medicinaregatan 18, SE-413 -90 Gothenburg, Sweden
| | - Nicholas I Mundy
- Department of Zoology, University of Cambridge, Cambridge CB2 3EJ, UK
| | - Staffan Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, Medicinaregatan 18, SE-413 -90 Gothenburg, Sweden
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Lindsay WR, Mendonça R, Slight MW, Prager M, Andersson MX, Mundy NI, Andersson S. Seasonal but not sex-biased gene expression of the carotenoid ketolase, CYP2J19, in the sexually dichromatic southern red bishop ( Euplectes orix). R Soc Open Sci 2022; 9:220434. [PMID: 35937912 PMCID: PMC9346373 DOI: 10.1098/rsos.220434] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Accepted: 07/11/2022] [Indexed: 05/11/2023]
Abstract
Intense red colours in birds are often owing to ketocarotenoids (KCs). In many land birds, KCs are oxidized from dietary yellow precursors, presumably by the avian carotenoid ketolase CYP2J19, the regulation and constraints of which have important implications for condition-dependence and honest signalling of carotenoid colour displays. We investigated hepatic CYP2J19 gene expression in the seasonally and sexually dichromatic southern red bishop (Euplectes orix) in relation to season, sex, progression of the prenuptial moult, testis size, body condition, redness and circulating sex steroids. A coloration function of CYP2J19 is supported by a seasonal upregulation prior to and during the carotenoid-depositing stage of the male prenuptial moult. However, CYP2J19 expression was similarly high in females (which do not moult prenuptially), and remained high in males after moult, suggesting additional or alternative roles of hepatic CYP2J19 or its products, such as detoxification or antioxidant functions. In males, the CYP2J19 upregulation preceded and was unrelated to the rise in plasma testosterone, but was correlated with androstenedione, probably of adrenal origin and compatible with luteinizing hormone-induced and (in females) oestrogen-suppressed moult. Finally, contrary to ideas that carotenoid ketolation rate mediates honest signalling of male quality, CYP2J19 expression was not related to plumage redness or male body condition.
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Affiliation(s)
- Willow R. Lindsay
- Department of Biological and Environmental Sciences, University of Gothenburg, Medicinaregatan 18, SE-413 -90 Gothenburg, Sweden
| | - Rute Mendonça
- Department of Biological and Environmental Sciences, University of Gothenburg, Medicinaregatan 18, SE-413 -90 Gothenburg, Sweden
| | - Mathilda Waleij Slight
- Department of Biological and Environmental Sciences, University of Gothenburg, Medicinaregatan 18, SE-413 -90 Gothenburg, Sweden
| | - Maria Prager
- Department of Ecology, Environment and Plant Sciences, University of Stockholm, 10691 Stockholm, Sweden
| | - Mats X. Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, Medicinaregatan 18, SE-413 -90 Gothenburg, Sweden
| | - Nicholas I. Mundy
- Department of Zoology, University of Cambridge, Cambridge CB2 3EJ, UK
| | - Staffan Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, Medicinaregatan 18, SE-413 -90 Gothenburg, Sweden
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Wittemann M, Andersson MX, Ntirugulirwa B, Tarvainen L, Wallin G, Uddling J. Temperature acclimation of net photosynthesis and its underlying component processes in four tropical tree species. Tree Physiol 2022; 42:1188-1202. [PMID: 35038330 PMCID: PMC9190752 DOI: 10.1093/treephys/tpac002] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Accepted: 01/11/2022] [Indexed: 05/26/2023]
Abstract
The effect of temperature change on leaf physiology has been extensively studied in temperate trees and to some extent in boreal and tropical tree species. While increased temperature typically stimulates leaf CO2 assimilation and tree growth in high-altitude ecosystems, tropical species are often negatively affected. These trees may operate close to their temperature optima and have a limited thermal acclimation capacity due to low seasonal and historical variation in temperature. To test this hypothesis, we studied the extent to which the temperature sensitivities of leaf photosynthesis and respiration acclimate to growth temperature in four common African tropical tree species. Tree seedlings native to different altitudes and therefore adapted to different growth temperatures were cultivated at three different temperatures in climate-controlled chambers. We estimated the acclimation capacity of the temperature sensitivities of light-saturated net photosynthesis, the maximum rates of Rubisco carboxylation (Vcmax) and thylakoid electron transport (J), and dark respiration. Leaf thylakoid membrane lipid composition, nitrogen content and leaf mass per area were also analyzed. Our results showed that photosynthesis in tropical tree species acclimated to higher growth temperatures, but that this was weakest in the species originating from the coolest climate. The temperature optimum of J acclimated significantly in three species and variation in J was linked to changes in the thylakoid membrane lipid composition. For Vcmax, there was only evidence of significant acclimation of optimal temperature in the lowest elevation species. Respiration acclimated to maintain homeostasis at growth temperature in all four species. Our results suggest that the lowest elevation species is better physiologically adapted to acclimate to high growth temperatures than the highest elevation species, indicating a potential shift in competitive balance and tree community composition to the disadvantage of montane tree species in a warmer world.
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Affiliation(s)
- Maria Wittemann
- Department of Biological and Environmental Sciences, University of Gothenburg, PO Box 461, Gothenburg SE-405 30, Sweden
- Gothenburg Global Biodiversity Centre (GGBC), University of Gothenburg, PO Box 461, Gothenburg SE-405 30, Sweden
- Department of Biology, College of Science and Technology, University of Rwanda, University Avenue, PO Box 117, Huye, Rwanda
| | - Mats X Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, PO Box 461, Gothenburg SE-405 30, Sweden
| | - Bonaventure Ntirugulirwa
- Department of Biological and Environmental Sciences, University of Gothenburg, PO Box 461, Gothenburg SE-405 30, Sweden
- Department of Biology, College of Science and Technology, University of Rwanda, University Avenue, PO Box 117, Huye, Rwanda
- Rwanda Agriculture and Resources Development Board (RAB), PO Box 5016, Kigali, Rwanda
| | - Lasse Tarvainen
- Department of Biological and Environmental Sciences, University of Gothenburg, PO Box 461, Gothenburg SE-405 30, Sweden
| | - Göran Wallin
- Department of Biological and Environmental Sciences, University of Gothenburg, PO Box 461, Gothenburg SE-405 30, Sweden
| | - Johan Uddling
- Department of Biological and Environmental Sciences, University of Gothenburg, PO Box 461, Gothenburg SE-405 30, Sweden
- Gothenburg Global Biodiversity Centre (GGBC), University of Gothenburg, PO Box 461, Gothenburg SE-405 30, Sweden
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Tarvainen L, Wittemann M, Mujawamariya M, Manishimwe A, Zibera E, Ntirugulirwa B, Ract C, Manzi OJL, Andersson MX, Spetea C, Nsabimana D, Wallin G, Uddling J. Handling the heat - photosynthetic thermal stress in tropical trees. New Phytol 2022; 233:236-250. [PMID: 34655491 DOI: 10.1111/nph.17809] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Accepted: 10/09/2021] [Indexed: 06/13/2023]
Abstract
Warming climate increases the risk for harmful leaf temperatures in terrestrial plants, causing heat stress and loss of productivity. The heat sensitivity may be particularly high in equatorial tropical tree species adapted to a thermally stable climate. Thermal thresholds of the photosynthetic system of sun-exposed leaves were investigated in three tropical montane tree species native to Rwanda with different growth and water use strategies (Harungana montana, Syzygium guineense and Entandrophragma exselsum). Measurements of chlorophyll fluorescence, leaf gas exchange, morphology, chemistry and temperature were made at three common gardens along an elevation/temperature gradient. Heat tolerance acclimated to maximum leaf temperature (Tleaf ) across the species. At the warmest sites, the thermal threshold for normal function of photosystem II was exceeded in the species with the highest Tleaf despite their higher heat tolerance. This was not the case in the species with the highest transpiration rates and lowest Tleaf . The results point to two differently effective strategies for managing thermal stress: tolerance through physiological adjustment of leaf osmolality and thylakoid membrane lipid composition, or avoidance through morphological adaptation and transpiratory cooling. More severe photosynthetic heat stress in low-transpiring montane climax species may result in a competitive disadvantage compared to high-transpiring pioneer species with more efficient leaf cooling.
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Affiliation(s)
- Lasse Tarvainen
- Department of Biological and Environmental Sciences, University of Gothenburg, PO Box 461, Gothenburg, SE-405 30, Sweden
| | - Maria Wittemann
- Department of Biological and Environmental Sciences, University of Gothenburg, PO Box 461, Gothenburg, SE-405 30, Sweden
- Department of Biology, University of Rwanda, University Avenue, PO Box 117, Huye, Rwanda
| | - Myriam Mujawamariya
- Department of Biological and Environmental Sciences, University of Gothenburg, PO Box 461, Gothenburg, SE-405 30, Sweden
- Department of Biology, University of Rwanda, University Avenue, PO Box 117, Huye, Rwanda
| | - Aloysie Manishimwe
- Department of Biological and Environmental Sciences, University of Gothenburg, PO Box 461, Gothenburg, SE-405 30, Sweden
- Department of Biology, University of Rwanda, University Avenue, PO Box 117, Huye, Rwanda
| | - Etienne Zibera
- Department of Biological and Environmental Sciences, University of Gothenburg, PO Box 461, Gothenburg, SE-405 30, Sweden
- Department of Biology, University of Rwanda, University Avenue, PO Box 117, Huye, Rwanda
| | - Bonaventure Ntirugulirwa
- Department of Biological and Environmental Sciences, University of Gothenburg, PO Box 461, Gothenburg, SE-405 30, Sweden
- Department of Biology, University of Rwanda, University Avenue, PO Box 117, Huye, Rwanda
- Rwanda Agriculture and Animal Development Board, PO Box 5016, Kigali, Rwanda
| | - Claire Ract
- Department of Biological and Environmental Sciences, University of Gothenburg, PO Box 461, Gothenburg, SE-405 30, Sweden
| | - Olivier J L Manzi
- Department of Biological and Environmental Sciences, University of Gothenburg, PO Box 461, Gothenburg, SE-405 30, Sweden
- Department of Biology, University of Rwanda, University Avenue, PO Box 117, Huye, Rwanda
| | - Mats X Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, PO Box 461, Gothenburg, SE-405 30, Sweden
| | - Cornelia Spetea
- Department of Biological and Environmental Sciences, University of Gothenburg, PO Box 461, Gothenburg, SE-405 30, Sweden
| | - Donat Nsabimana
- School of Forestry and Biodiversity and Biological Sciences, University of Rwanda, Busogo, Rwanda
| | - Göran Wallin
- Department of Biological and Environmental Sciences, University of Gothenburg, PO Box 461, Gothenburg, SE-405 30, Sweden
| | - Johan Uddling
- Department of Biological and Environmental Sciences, University of Gothenburg, PO Box 461, Gothenburg, SE-405 30, Sweden
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9
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Hortensius LM, Hellström W, Sävman K, Heckemann RA, Björkman-Burtscher IM, Groenendaal F, Andersson MX, Nilsson AK, Tataranno ML, van Elburg RM, Hellström A, Benders MJNL. Serum docosahexaenoic acid levels are associated with brain volumes in extremely preterm born infants. Pediatr Res 2021; 90:1177-1185. [PMID: 34392310 DOI: 10.1038/s41390-021-01645-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 06/04/2021] [Accepted: 06/24/2021] [Indexed: 11/09/2022]
Abstract
BACKGROUND Docosahexaenoic acid (DHA) and arachidonic acid (AA) are important for fetal brain growth and development. Our aim was to evaluate the association between serum DHA and AA levels and brain volumes in extremely preterm infants. METHODS Infants born at <28 weeks gestational age in 2013-2015, a cohort derived from a randomized controlled trial comparing two types of parenteral lipid emulsions, were included (n = 90). Serum DHA and AA levels were measured at postnatal days 1, 7, 14, and 28, and the area under the curve was calculated. Magnetic resonance (MR) imaging was performed at term-equivalent age (n = 66), and volumes of six brain regions were automatically generated. RESULTS After MR image quality assessment and area under the curve calculation, 48 infants were included (gestational age mean [SD] 25.5 [1.4] weeks). DHA levels were positively associated with total brain (B = 7.966, p = 0.012), cortical gray matter (B = 3.653, p = 0.036), deep gray matter (B = 0.439, p = 0.014), cerebellar (B = 0.932, p = 0.003), and white matter volume (B = 3.373, p = 0.022). AA levels showed no association with brain volumes. CONCLUSIONS Serum DHA levels during the first 28 postnatal days were positively associated with volumes of several brain structures in extremely preterm infants at term-equivalent age. IMPACT Higher serum levels of DHA in the first 28 postnatal days are positively associated with brain volumes at term-equivalent age in extremely preterm born infants. Especially the most immature infants suffer from low DHA levels in the first 28 postnatal days, with little increase over time. Future research is needed to explore whether postnatal fatty acid supplementation can improve brain development and may serve as a nutritional preventive and therapeutic treatment option in extremely preterm infants.
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Affiliation(s)
- Lisa M Hortensius
- Department of Neonatology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands.,University Medical Center Utrecht Brain Center, Utrecht University, Utrecht, The Netherlands
| | - William Hellström
- Department of Pediatrics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Karin Sävman
- Department of Pediatrics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.,Region Västra Götaland, Department of Neonatology, The Queen Silvia Children's Hospital, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Rolf A Heckemann
- Department of Medical Radiation Sciences, Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Isabella M Björkman-Burtscher
- Department of Radiology, Clinical Sciences, Sahlgrenska Academy, University of Gothenburg and Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Floris Groenendaal
- Department of Neonatology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands.,University Medical Center Utrecht Brain Center, Utrecht University, Utrecht, The Netherlands
| | - Mats X Andersson
- Department of Biology and Environmental Sciences, The Faculty of Science, University of Gothenburg, Gothenburg, Sweden
| | - Anders K Nilsson
- Section for Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Maria Luisa Tataranno
- Department of Neonatology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands.,University Medical Center Utrecht Brain Center, Utrecht University, Utrecht, The Netherlands
| | - Ruurd M van Elburg
- Department of Neonatology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands.,Emma Children's Hospital, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Ann Hellström
- Section for Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Manon J N L Benders
- Department of Neonatology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands. .,University Medical Center Utrecht Brain Center, Utrecht University, Utrecht, The Netherlands.
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10
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Cheregi O, Engelbrektsson J, Andersson MX, Strömberg N, Ekendahl S, Godhe A, Spetea C. Marine microalgae for outdoor biomass production-A laboratory study simulating seasonal light and temperature for the west coast of Sweden. Physiol Plant 2021; 173:543-554. [PMID: 33826748 DOI: 10.1111/ppl.13412] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Revised: 03/22/2021] [Accepted: 03/26/2021] [Indexed: 06/12/2023]
Abstract
At Nordic latitudes, year-round outdoor cultivation of microalgae is debatable due to seasonal variations in productivity. Shall the same species/strains be used throughout the year, or shall seasonal-adapted ones be used? To elucidate this, a laboratory study was performed where two out of 167 marine microalgal strains were selected for intended cultivation at the west coast of Sweden. The two local strains belong to Nannochloropsis granulata (Ng) and Skeletonema marinoi (Sm142). They were cultivated in photobioreactors and compared in conditions simulating variations in light and temperature of a year divided into three growth seasons (spring, summer and winter). The strains grew similarly well in summer (and also in spring), but Ng produced more biomass (0.225 vs. 0.066 g DW L-1 day-1 ) which was more energy rich (25.0 vs. 16.6 MJ kg-1 DW). In winter, Sm142 grew faster and produced more biomass (0.017 vs. 0.007 g DW L-1 day-1 ), having similar energy to the other seasons. The higher energy of the Ng biomass is attributed to a higher lipid content (40 vs. 16% in summer). The biomass of both strains was richest in proteins (65%) in spring. In all seasons, Sm142 was more effective in removing phosphorus from the cultivation medium (6.58 vs. 4.14 mg L-1 day-1 in summer), whereas Ng was more effective in removing nitrogen only in summer (55.0 vs. 30.8 mg L-1 day-1 ). Our results suggest that, depending on the purpose, either the same or different local species can be cultivated, and are relevant when designing outdoor studies.
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Affiliation(s)
- Otilia Cheregi
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Johan Engelbrektsson
- Department of Chemistry, Biomaterials and Textiles, RISE Research Institutes of Sweden AB, Gothenburg, Sweden
| | - Mats X Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Niklas Strömberg
- Department of Chemistry, Biomaterials and Textiles, RISE Research Institutes of Sweden AB, Gothenburg, Sweden
| | - Susanne Ekendahl
- Department of Chemistry, Biomaterials and Textiles, RISE Research Institutes of Sweden AB, Gothenburg, Sweden
| | - Anna Godhe
- Department of Marine Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Cornelia Spetea
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
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11
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Nilsson AK, Andersson MX, Sjöbom U, Hellgren G, Lundgren P, Pivodic A, Smith LEH, Hellström A. Sphingolipidomics of serum in extremely preterm infants: Association between low sphingosine-1-phosphate levels and severe retinopathy of prematurity. Biochim Biophys Acta Mol Cell Biol Lipids 2021; 1866:158939. [PMID: 33862236 PMCID: PMC8633973 DOI: 10.1016/j.bbalip.2021.158939] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 03/26/2021] [Accepted: 03/30/2021] [Indexed: 02/08/2023]
Abstract
BACKGROUND Extremely preterm infants are at risk of developing retinopathy of prematurity (ROP) that can cause impaired vision or blindness. Changes in blood lipids have been associated with ROP. This study aimed to monitor longitudinal changes in the serum sphingolipidome of extremely preterm infants and investigate the relationship to development of severe ROP. METHODS This is a prospective study that included 47 infants born <28 gestational weeks. Serum samples were collected from cord blood and at postnatal days 1, 7, 14, and 28, and at postmenstrual weeks (PMW) 32, 36, and 40. Serum sphingolipids and phosphatidylcholines were extracted and analyzed by LC-MS/MS. Associations between sphingolipid species and ROP were assessed using mixed models for repeated measures. RESULTS The serum concentration of all investigated lipid classes, including ceramide, mono- di- and trihexosylceramide, sphingomyelin, and phosphatidylcholine displayed distinct temporal patterns between birth and PMW40. There were also substantial changes in the lipid species composition within each class. Among the analyzed sphingolipid species, sphingosine-1-phosphate showed the strongest association with severe ROP, and this association was independent of gestational age at birth and weight standard deviation score change. CONCLUSIONS The serum phospho- and sphingolipidome undergoes significant remodeling during the first weeks of the preterm infant's life. Low postnatal levels of the signaling lipid sphingosine-1-phosphate are associated with the development of severe ROP.
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Affiliation(s)
- Anders K Nilsson
- Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
| | - Mats X Andersson
- Department of Biology and Environmental Sciences, The Faculty of Science, University of Gothenburg, Gothenburg, Sweden
| | - Ulrika Sjöbom
- Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden; Institute of Health and Care Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Gunnel Hellgren
- Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden; Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Pia Lundgren
- Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden; School of Medical Sciences, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
| | - Aldina Pivodic
- Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Lois E H Smith
- The Department of Ophthalmology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
| | - Ann Hellström
- Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
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12
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Ankarberg-Lindgren C, Andersson MX, Dahlgren J. Determination of estrone sulfate, testosterone, androstenedione, DHEAS, cortisol, cortisone, and 17α-hydroxyprogesterone by LC-MS/MS in children and adolescents. Scandinavian Journal of Clinical and Laboratory Investigation 2020; 80:672-680. [DOI: 10.1080/00365513.2020.1829699] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Carina Ankarberg-Lindgren
- Göteborg Pediatric Growth Research Center, Department of Pediatrics, Institute of Clinical Sciences, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Mats X. Andersson
- Göteborg Pediatric Growth Research Center, Department of Pediatrics, Institute of Clinical Sciences, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Jovanna Dahlgren
- Göteborg Pediatric Growth Research Center, Department of Pediatrics, Institute of Clinical Sciences, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
- Department of Endocrinology, Region Västra Götaland, Queen Silvia Children´s Hospital, Sahlgrenska University Hospital, Gothenburg, Sweden
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13
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Genva M, Andersson MX, Fauconnier ML. Simple liquid chromatography-electrospray ionization ion trap mass spectrometry method for the quantification of galacto-oxylipin arabidopsides in plant samples. Sci Rep 2020; 10:11957. [PMID: 32686714 PMCID: PMC7371884 DOI: 10.1038/s41598-020-68757-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 06/29/2020] [Indexed: 11/13/2022] Open
Abstract
A simple and sensitive method to quantify five different arabidopsides by HPLC—ion trap mass spectrometry in complex plant samples was developed and validated. Arabidopsides are oxidized galactolipids first described in Arabidopsis thaliana but also produced by other plant species under stress conditions. External calibration was performed using arabidopsides purified from freeze-thawed Arabidopsis leaves. Lipids were extracted and pre-purified on an SPE silica column before HPLC–MS analysis. Arabidopsides were separated on a C18 column using a gradient of mQ water and acetonitrile:mQ water (85:15) supplemented with formic acid (0.2%) and ammonium formate (12 mM). The method was validated according to European commission decision 2002/657/CE. LOD, LOQ, linearity, intra-day and inter-day precision and accuracy, selectivity, matrix effects and recoveries were determined for the five metabolites. The established method is highly selective in a complex plant matrix. LOD and LOQ were, respectively, in the range 0.098–0.78 and 0.64–1.56 µM, allowing the arabidopside quantification from 25.6–62.4 nmol/g fresh weight. Calibration curve correlation coefficients were higher than 0.997. Matrix effects ranged from -2.09% to 6.10% and recoveries between 70.7% and 109%. The method was successfully applied to complex plant matrixes: Arabidopsis thaliana and Nasturtium officinale.
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Affiliation(s)
- Manon Genva
- Laboratory of Chemistry of Natural Molecules, Gembloux Agro-Bio Tech, University of Liège, Passage des Déportés 2, 5030, Gembloux, Belgium.
| | - Mats X Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, 405 30, Göteborg, Sweden
| | - Marie-Laure Fauconnier
- Laboratory of Chemistry of Natural Molecules, Gembloux Agro-Bio Tech, University of Liège, Passage des Déportés 2, 5030, Gembloux, Belgium
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14
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Johansson KSL, El-Soda M, Pagel E, Meyer RC, Tõldsepp K, Nilsson AK, Brosché M, Kollist H, Uddling J, Andersson MX. Genetic controls of short- and long-term stomatal CO2 responses in Arabidopsis thaliana. Ann Bot 2020; 126:179-190. [PMID: 32296835 PMCID: PMC7304471 DOI: 10.1093/aob/mcaa065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Accepted: 04/09/2020] [Indexed: 05/14/2023]
Abstract
BACKGROUND AND AIMS The stomatal conductance (gs) of most plant species decreases in response to elevated atmospheric CO2 concentration. This response could have a significant impact on plant water use in a future climate. However, the regulation of the CO2-induced stomatal closure response is not fully understood. Moreover, the potential genetic links between short-term (within minutes to hours) and long-term (within weeks to months) responses of gs to increased atmospheric CO2 have not been explored. METHODS We used Arabidopsis thaliana recombinant inbred lines originating from accessions Col-0 (strong CO2 response) and C24 (weak CO2 response) to study short- and long-term controls of gs. Quantitative trait locus (QTL) mapping was used to identify loci controlling short- and long-term gs responses to elevated CO2, as well as other stomata-related traits. KEY RESULTS Short- and long-term stomatal responses to elevated CO2 were significantly correlated. Both short- and long-term responses were associated with a QTL at the end of chromosome 2. The location of this QTL was confirmed using near-isogenic lines and it was fine-mapped to a 410-kb region. The QTL did not correspond to any known gene involved in stomatal closure and had no effect on the responsiveness to abscisic acid. Additionally, we identified numerous other loci associated with stomatal regulation. CONCLUSIONS We identified and confirmed the effect of a strong QTL corresponding to a yet unknown regulator of stomatal closure in response to elevated CO2 concentration. The correlation between short- and long-term stomatal CO2 responses and the genetic link between these traits highlight the importance of understanding guard cell CO2 signalling to predict and manipulate plant water use in a world with increasing atmospheric CO2 concentration. This study demonstrates the power of using natural variation to unravel the genetic regulation of complex traits.
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Affiliation(s)
- Karin S L Johansson
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
- Institute of Technology, University of Tartu, Tartu, Estonia
| | - Mohamed El-Soda
- Department of Genetics, Faculty of Agriculture, Cairo University, Cairo, Egypt
| | - Ellen Pagel
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Rhonda C Meyer
- Department of Molecular Genetics, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK) Gatersleben, Seeland, Germany
| | - Kadri Tõldsepp
- Institute of Technology, University of Tartu, Tartu, Estonia
| | - Anders K Nilsson
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Mikael Brosché
- Institute of Technology, University of Tartu, Tartu, Estonia
- Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland
| | - Hannes Kollist
- Institute of Technology, University of Tartu, Tartu, Estonia
| | - Johan Uddling
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Mats X Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
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15
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Johansson ON, Töpel M, Egardt J, Pinder MIM, Andersson MX, Godhe A, Clarke AK. Phenomics reveals a novel putative chloroplast fatty acid transporter in the marine diatom Skeletonema marinoi involved in temperature acclimation. Sci Rep 2019; 9:15143. [PMID: 31641221 PMCID: PMC6805942 DOI: 10.1038/s41598-019-51683-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 10/04/2019] [Indexed: 01/06/2023] Open
Abstract
Diatoms are the dominant phytoplankton in temperate oceans and coastal regions and yet little is known about the genetic basis underpinning their global success. Here, we address this challenge by developing the first phenomic approach for a diatom, screening a collection of randomly mutagenized but identifiably tagged transformants. Based upon their tolerance to temperature extremes, several compromised mutants were identified revealing genes either stress related or encoding hypothetical proteins of unknown function. We reveal one of these hypothetical proteins is a novel putative chloroplast fatty acid transporter whose loss affects several fatty acids including the two omega-3, long-chain polyunsaturated fatty acids - eicosapentaenoic and docosahexaenoic acid, both of which have medical importance as dietary supplements and industrial significance in aquaculture and biofuels. This mutant phenotype not only provides new insights into the fatty acid biosynthetic pathways in diatoms but also highlights the future value of phenomics for revealing specific gene functions in these ecologically important phytoplankton.
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Affiliation(s)
- Oskar N Johansson
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, 40530, Gothenburg, Sweden
| | - Mats Töpel
- Department of Marine Sciences, University of Gothenburg, Box 462, 40530, Gothenburg, Sweden.,Gothenburg Global Biodiversity Center (GGBC), Box 461, 40530, Gothenburg, Sweden
| | - Jenny Egardt
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, 40530, Gothenburg, Sweden
| | - Matthew I M Pinder
- Department of Marine Sciences, University of Gothenburg, Box 462, 40530, Gothenburg, Sweden
| | - Mats X Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, 40530, Gothenburg, Sweden
| | - Anna Godhe
- Department of Marine Sciences, University of Gothenburg, Box 462, 40530, Gothenburg, Sweden
| | - Adrian K Clarke
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, 40530, Gothenburg, Sweden.
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16
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Löfqvist CA, Najm S, Hellgren G, Engström E, Sävman K, Nilsson AK, Andersson MX, Hård AL, Smith LEH, Hellström A. Association of Retinopathy of Prematurity With Low Levels of Arachidonic Acid: A Secondary Analysis of a Randomized Clinical Trial. JAMA Ophthalmol 2019; 136:271-277. [PMID: 29423508 PMCID: PMC5885898 DOI: 10.1001/jamaophthalmol.2017.6658] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Importance Mice with oxygen-induced retinopathy fed matched diets except for ω-3 long-chain polyunsaturated fatty acids (LC-PUFAs) vs ω-6 LC-PUFAs demonstrate relative antiangiogenic and neuroprotective associations of ω-3 LC-PUFAs. However, supplementing preterm infants with LC-PUFAs has been inconsistent in reducing major preterm morbidities. However, few studies measured serum lipid levels after supplementation. Objective To examine the associated risk of retinopathy of prematurity (ROP) from the levels of circulating ω-3 and ω-6 LC-PUFAs. Design, Setting, and Participants This longitudinal clinical study was a further analysis of serum lipid levels from a randomized controlled trial cohort of 90 infants born at gestational age (GA) less than 28 weeks. From April 4, 2013, to September 22, 2015, cord blood samples, followed by venous blood samples, were obtained at birth and at 1, 7, 14, and 28 days after birth and then at postmenstrual age (PMA) 32, 36, and 40 weeks at the neonatal intensive care unit at Sahlgrenska University Hospital in Göteborg, Sweden. Main Outcomes and Measures Serum phospholipid fatty acids were transmethylated and measured by gas chromatography-mass spectrometry. Mann-Whitney test, logistic regression Spearman rank correlation, and receiver operating characteristic curve analysis were used to compare differences between infants with no ROP and infants who developed ROP. Results Serum levels from 78 infants (43 male [55%]; mean [SD] GA, 25.5 [1.4] weeks) with a known ROP outcome were evaluated. Lower area under the curve (AUC) of arachidonic acid (AA) (20:4 ω-6) was seen in infants with a later diagnosis of ROP compared with infants with no ROP in the first month of life (mean, 34.05 [95% CI, 32.10-36.00] vs 37.15 [95% CI, 34.85-39.46]; P < .05). In addition, lower levels of AA at 32 weeks' PMA were seen in infants with later severe ROP compared with in those without ROP (mean, 7.06 [95% CI, 6.60-7.52] vs 8.74 [95% CI, 7.80-9.67]; P < .001). In logistic modeling, low postnatal serum levels of AA and GA at birth identified with a sensitivity greater than 90% of infants who developed ROP. Conclusions and Relevance Low postnatal levels of the ω-6 LC-PUFAs (AA) are strongly associated with ROP development. Evaluating postnatal AA fraction after birth in addition to GA may be useful for ROP prediction. Trial Registration clinicaltrials.gov Identifier: NCT02760472.
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Affiliation(s)
- Chatarina A Löfqvist
- Section of Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
| | - Svetlana Najm
- Department of Paediatrics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
| | - Gunnel Hellgren
- Section of Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden.,Department of Paediatrics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
| | - Eva Engström
- Department of Paediatrics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
| | - Karin Sävman
- Section of Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
| | - Anders K Nilsson
- Section of Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
| | - Mats X Andersson
- Department of Biology and Environmental Sciences, University of Gothenburg, Göteborg, Sweden
| | - Anna-Lena Hård
- Section of Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
| | - Lois E H Smith
- Department of Ophthalmology, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Ann Hellström
- Section of Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
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17
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Fahlberg P, Buhot N, Johansson ON, Andersson MX. Involvement of lipid transfer proteins in resistance against a non-host powdery mildew in Arabidopsis thaliana. Mol Plant Pathol 2019; 20:69-77. [PMID: 30102837 PMCID: PMC6430466 DOI: 10.1111/mpp.12740] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Non-specific lipid transfer proteins (LTPs) are involved in the transport of lipophilic compounds to the cuticular surface in epidermal cells and in the defence against pathogens. The role of glycophosphatidylinositol (GPI)-anchored LTPs (LTPGs) in resistance against non-host mildews in Arabidopsis thaliana was investigated using reverse genetics. Loss of either LTPG1, LTPG2, LTPG5 or LTPG6 increased the susceptibility to penetration of the epidermal cell wall by Blumeria graminis f. sp. hordei (Bgh). However, no impact on pre-penetration defence against another non-host mildew, Erysiphe pisi (Ep), was observed. LTPG1 was localized to papillae at the sites of Bgh penetration. This study shows that, in addition to the previously known functions, LTPGs contribute to pre-invasive defence against certain non-host powdery mildew pathogens.
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Affiliation(s)
- Per Fahlberg
- Department of Biology and Environmental SciencesUniversity of GothenburgGothenburgSE‐405 30GöteborgSweden
| | - Nathalie Buhot
- Department of Biology and Environmental SciencesUniversity of GothenburgGothenburgSE‐405 30GöteborgSweden
| | - Oskar N. Johansson
- Department of Biology and Environmental SciencesUniversity of GothenburgGothenburgSE‐405 30GöteborgSweden
| | - Mats X. Andersson
- Department of Biology and Environmental SciencesUniversity of GothenburgGothenburgSE‐405 30GöteborgSweden
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18
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Ankarberg-Lindgren C, Dahlgren J, Andersson MX. High-sensitivity quantification of serum androstenedione, testosterone, dihydrotestosterone, estrone and estradiol by gas chromatography-tandem mass spectrometry with sex- and puberty-specific reference intervals. J Steroid Biochem Mol Biol 2018; 183:116-124. [PMID: 29894754 DOI: 10.1016/j.jsbmb.2018.06.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 03/23/2018] [Accepted: 06/04/2018] [Indexed: 01/09/2023]
Abstract
BACKGROUND Androgen and estrogen determinations serve as important diagnostic markers in a variety of clinical conditions. However, one challenge is to enhance assay sensitivity for determination in the lowest range, such as in prepubertal children. We here present a recently developed gas chromatography-tandem mass spectrometry (GC-MS/MS) method for determination of androstenedione (A4), dihydrotestosterone (DHT), testosterone (T), estrone (E1), and estradiol (E2) in children, which we have compared with the sensitive radioimmunoassays; E2 extraction-RIA and T-RIA. METHODS Steroids were extracted in ethyl acetate n-hexane solution from serum spiked with isotopically labeled internal standard and derivatized sequentially with pentafluorobenzyl bromide, pentafluorobenzyl hydroxylamine and pentafluoropropionic acid anhydride and analyzed by GC-MS/MS using a triple quadrupole mass spectrometer operated in negative chemical ionization mode. Leftover routine samples (n = 414) were used to evaluate the concordance between GC-MS/MS and RIAs and the validity of GC-MS/MS for pediatrics; of these samples, 101 were from seemingly healthy children. Pubertal stage was recorded for reference interval evaluation. RESULTS Lower limit of detection for A4, T, DHT, E1, and E2 were 0.1 nmol/L, 0.1 nmol/L, 27 pmol/L, 9 pmol/L, and 2 pmol/L, respectively. Good agreement was found between GC-MS/MS and T-RIA (r = 0.98) as well as between GC-MS/MS and E2 extraction-RIA (r = 0.98, for E2 concentrations above 14 pmol/L). In boys, T and DHT increased significantly from prepuberty throughout pubertal development, and in girls the same increase was observed for E1 and E2. The greatest increase in A4 for both genders, as well as E1 and E2 in boys and T and DHT in girls, occurred in mid to late puberty. CONCLUSIONS We report the development of a GC-MS/MS method sensitive enough to accurately determine serum levels of androgens and estrogens in children.
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Affiliation(s)
- Carina Ankarberg-Lindgren
- Göteborg Pediatric Growth Research Center, Department of Pediatrics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden.
| | - Jovanna Dahlgren
- Göteborg Pediatric Growth Research Center, Department of Pediatrics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
| | - Mats X Andersson
- Göteborg Pediatric Growth Research Center, Department of Pediatrics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden; Department of Biological and Environmental Sciences, University of Gothenburg, Göteborg, Sweden
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Nilsson AK, Löfqvist C, Najm S, Hellgren G, Sävman K, Andersson MX, Smith LEH, Hellström A. Long-chain polyunsaturated fatty acids decline rapidly in milk from mothers delivering extremely preterm indicating the need for supplementation. Acta Paediatr 2018; 107:1020-1027. [PMID: 29444356 PMCID: PMC5969106 DOI: 10.1111/apa.14275] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Accepted: 02/08/2018] [Indexed: 12/11/2022]
Abstract
AIM Our aim was to perform an in-depth analysis of the composition of fatty acids in milk from mothers delivering extremely preterm babies. We investigated longitudinal changes in milk fatty acid profiles and the relationship between several types of fatty acids, including omega-3 and omega-6. METHODS Milk samples were collected at three stages of lactation from 78 mothers who delivered at less than 28 weeks of pregnancy at the Sahlgrenska University Hospital, Gothenburg, Sweden, from April 2013 to September 2015. Fatty acid composition was analysed by gas chromatography-mass spectrometry. RESULTS A reduction in long-chain polyunsaturated fatty acids (LCPUFAs) was observed during the lactation period. The concentrations of arachidonic acid and docosahexaenoic acid declined from medians of 0.34 to 0.22 mol% and 0.29 to 0.15 mol%, respectively, between postnatal day 7 and a postmenstrual age of 40 weeks. Strong correlations were found between the intermediates of several classes of fatty acids, including omega-3, omega-6 and omega-9. CONCLUSION A rapid reduction in LCPUFA content in the mother's milk during the lactation period emphasises the importance of fatty acid supplementation to infants born extremely preterm, at least during the period corresponding to the third trimester, when rapid development of the brain and adipose tissue requires high levels of LCPUFAs.
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Affiliation(s)
- Anders K. Nilsson
- Section for Ophthalmology; Department of Clinical Neuroscience; Institute of Neuroscience and Physiology; Sahlgrenska Academy; University of Gothenburg; Gothenburg Sweden
| | - Chatarina Löfqvist
- Section for Ophthalmology; Department of Clinical Neuroscience; Institute of Neuroscience and Physiology; Sahlgrenska Academy; University of Gothenburg; Gothenburg Sweden
| | - Svetlana Najm
- Department of Paediatrics; Institute of Clinical Sciences; Sahlgrenska Academy; University of Gothenburg; Gothenburg Sweden
| | - Gunnel Hellgren
- Section for Ophthalmology; Department of Clinical Neuroscience; Institute of Neuroscience and Physiology; Sahlgrenska Academy; University of Gothenburg; Gothenburg Sweden
| | - Karin Sävman
- Department of Paediatrics; Institute of Clinical Sciences; Sahlgrenska Academy; University of Gothenburg; Gothenburg Sweden
| | - Mats X. Andersson
- Department of Biology and Environmental Sciences; The Faculty of Science; University of Gothenburg; Gothenburg Sweden
| | - Lois E. H. Smith
- The Department of Ophthalmology; Harvard Medical School; Boston Children's Hospital; Boston MA USA
| | - Ann Hellström
- Section for Ophthalmology; Department of Clinical Neuroscience; Institute of Neuroscience and Physiology; Sahlgrenska Academy; University of Gothenburg; Gothenburg Sweden
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20
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Nilsson AK, Löfqvist C, Najm S, Hellgren G, Sävman K, Andersson MX, Smith LEH, Hellström A. Influence of Human Milk and Parenteral Lipid Emulsions on Serum Fatty Acid Profiles in Extremely Preterm Infants. JPEN J Parenter Enteral Nutr 2018; 43:152-161. [PMID: 29679529 PMCID: PMC6437763 DOI: 10.1002/jpen.1172] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Accepted: 03/19/2018] [Indexed: 12/27/2022]
Abstract
Background Infants born prematurely are at risk of a deficiency in ω‐6 and ω‐3 long‐chain polyunsaturated fatty acids (LC‐PUFAs) arachidonic acid (AA) and docosahexaenoic acid (DHA). We investigated how fatty acids from breast milk and parenteral lipid emulsions shape serum LC‐PUFA profiles in extremely preterm infants during early perinatal life. Methods Ninety infants born < 28 weeks gestational age were randomized to receive parenteral lipids with or without the ω‐3 LC‐PUFAs eicosapentaenoic acid (EPA) and DHA (SMOFlipid: Fresenius Kabi, Uppsala, Sweden, or Clinoleic: Baxter Medical AB, Kista, Sweden, respectively). The fatty acid composition of infant serum phospholipids was determined from birth to postmenstrual age 40 weeks, and in mother's milk total lipids on postnatal day 7. Enteral and parenteral intake of LC‐PUFAs was correlated with levels in infant serum. Results Infants administered parenteral ω‐3 LC‐PUFAs received 4.4 and 19.3 times more DHA and EPA, respectively, over the first 2 weeks of life. Parenteral EPA but not DHA correlated with levels in infant serum. We found linear relationships between dietary EPA and DHA and infant serum levels in the Clinoleic (Baxter Medical AB) group. The volume of administered SMOFlipid (Fresenius Kabi) was inversely correlated with serum AA, whereas Clinoleic (Baxter Medical AB) inversely correlated with serum EPA and DHA. Conclusions There appears to be no or low correlation between the amount of DHA administered parenterally and levels measured in serum. Whether this observation reflects serum phospholipid fraction only or truly represents the amount of accreted DHA needs to be investigated. None of the parenteral lipid emulsions satisfactorily maintained high levels of both ω‐6 and ω‐3 LC‐PUFAs in infant serum.
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Affiliation(s)
- Anders K Nilsson
- Section for Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Chatarina Löfqvist
- Section for Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Svetlana Najm
- Department of Paediatrics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Gunnel Hellgren
- Section for Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.,Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Karin Sävman
- Department of Paediatrics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Mats X Andersson
- Department of Biology and Environmental Sciences, The Faculty of Science, University of Gothenburg, Gothenburg
| | - Lois E H Smith
- Department of Ophthalmology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
| | - Ann Hellström
- Section for Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
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Amato A, Sabatino V, Nylund GM, Bergkvist J, Basu S, Andersson MX, Sanges R, Godhe A, Kiørboe T, Selander E, Ferrante MI. Grazer-induced transcriptomic and metabolomic response of the chain-forming diatom Skeletonema marinoi. ISME J 2018; 12:1594-1604. [PMID: 29599523 PMCID: PMC5955879 DOI: 10.1038/s41396-018-0094-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Revised: 11/22/2017] [Accepted: 01/25/2018] [Indexed: 12/04/2022]
Abstract
Diatoms and copepods are main actors in marine food webs. The prey–predator interactions between them affect bloom dynamics, shape marine ecosystems and impact the energy transfer to higher trophic levels. Recently it has been demonstrated that the presence of grazers may affect the diatom prey beyond the direct effect of grazing. Here, we investigated the response of the chain-forming centric diatom Skeletonema marinoi to grazer cues, including changes in morphology, gene expression and metabolic profile. S. marinoi cells were incubated with Calanus finmarchicus or with Centropages typicus and in both cases responded by reducing the chain length, whereas changes in gene expression indicated an activation of stress response, changes in the lipid and nitrogen metabolism, in cell cycle regulation and in frustule formation. Transcripts linked to G protein-coupled receptors and to nitric oxide synthesis were differentially expressed suggesting involvement of these signalling transduction pathways in the response. Downregulation of a lipoxygenase in the transcriptomic data and of its products in the metabolomic data also indicate an involvement of oxylipins. Our data contribute to a better understanding of the gene function in diatoms, providing information on the nature of genes implicated in the interaction with grazers, a crucial process in marine ecosystems.
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Affiliation(s)
- Alberto Amato
- Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Villa Comunale 1, Naples, 80121, Italy.,Laboratoire de Physiologie Cellulaire et Végétale, UMR5168 CNRS-CEA-INRA-Université de Grenoble Alpes, Institut de Recherche en Science et Technologies pour le Vivant, CEA Grenoble, 17 rue des Martyrs, 38054, Grenoble Cédex 9, France
| | - Valeria Sabatino
- Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Villa Comunale 1, Naples, 80121, Italy
| | - Göran M Nylund
- Department Marine Sciences, University of Gothenburg, Tjärnö, SE-452 96, Strömstad, Sweden
| | - Johanna Bergkvist
- Department of Biology and Environmental Sciences, University of Gothenburg, Box 461, SE-405 30, Göteborg, Sweden
| | - Swaraj Basu
- Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Villa Comunale 1, Naples, 80121, Italy.,Department of Medical Biochemistry and Cell Biology, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, SE-405 30, Gothenburg, Sweden
| | - Mats X Andersson
- Department of Biology and Environmental Sciences, University of Gothenburg, Box 461, SE-405 30, Göteborg, Sweden
| | - Remo Sanges
- Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Villa Comunale 1, Naples, 80121, Italy
| | - Anna Godhe
- Department Marine Sciences, University of Gothenburg, Box 461, SE-405 30, Gothenburg, Sweden
| | - Thomas Kiørboe
- Centre for Ocean Life, DTU-Aqua, Kemitorvet Building 202, 2800 Kgs, Lyngby, Denmark
| | - Erik Selander
- Department Marine Sciences, University of Gothenburg, Box 461, SE-405 30, Gothenburg, Sweden
| | - Maria I Ferrante
- Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Villa Comunale 1, Naples, 80121, Italy.
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Kvernebo-Sunnergren K, Ankarberg-Lindgren C, Åkesson K, Andersson MX, Samuelsson L, Lovmar L, Dahlgren J. Hyperestrogenism Affects Adult Height Outcome in Growth Hormone Treated Boys With Silver-Russell Syndrome. Front Endocrinol (Lausanne) 2018; 9:780. [PMID: 30622515 PMCID: PMC6308318 DOI: 10.3389/fendo.2018.00780] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Accepted: 12/11/2018] [Indexed: 11/29/2022] Open
Abstract
Background: Intrauterine growth retardation and short stature are common features in Silver-Russell syndrome (SRS). Despite recombinant growth hormone (rGH) treatment, poor pubertal height gain, affecting adult height (AH), is common. This study investigated whether growth patterns and estrogen concentrations are associated with AH outcome in rGH treated SRS males. Methods: In this retrospective longitudinal single-center study, 11 males with SRS were classified as non-responders (NR = 6) or responders (R = 5), depending on AH adjusted for midparental height. Epigenetic analysis and longitudinal growth measures, including bone age, rGH related parameters, pubertal development, gonadotropins and estrogen concentrations, were analyzed until AH. Results: Pubarche before 9 years was only observed in one NR. At 10 years of age, there was no difference in gonadotropins between NR and R. However, estradiol (E2) concentrations at 10 years of age showed a strong association to AH adjusted for MPH (r = -0.78, p < 0.001). Serum E2 (pmol/L) was significantly higher in NR at ages 10 years [median (range) 2 (<2-5) vs. <2 (<2)], 12 years [23 (10-57) vs. 2 (<2-2)] and 14 years [77 (54-87) vs. 24 (<2-38)] but not at 16 years. Birth weight standard deviation score (SDS) was lower in NR [-4.1 (-4.7 to -2.1) vs. -2.7 (-3.3 to -1.7)]. Weight gain (SDS) until pubertal onset was greater in NR [2.4 (1.4-3.5) vs. 0.8 (-0.4 to 1.7)] and pubertal height gain (SDS) was lower in NR [-1.0 (-2.7-0.4) vs. 0.1 (-0.1 to 1.1)]. At AH, a number of NR and R had high E2 concentrations and small testes. Conclusion: Increased E2 concentrations at age 10, 12, and 14 years were associated to less pubertal height gain, thus affecting AH. Due to the small number of patients, the results need to be confirmed in larger cohorts. The finding of impaired testicular development stresses the need of hormonal evaluation as a complement to clinical and radiological assessment when predicting AH in males with SRS.
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Affiliation(s)
- Kjersti Kvernebo-Sunnergren
- Department of Pediatrics, Ryhov County Hospital, Jönköping, Sweden
- Department of Pediatrics, Göteborg Pediatric Growth Research Center, Institute of Clinical Sciences, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
- *Correspondence: Kjersti Kvernebo-Sunnergren
| | - Carina Ankarberg-Lindgren
- Department of Pediatrics, Göteborg Pediatric Growth Research Center, Institute of Clinical Sciences, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Karin Åkesson
- Department of Pediatrics, Ryhov County Hospital, Jönköping, Sweden
- Division of Pediatrics, Department of Clinical and Experimental Medicine, Linköping University Hospital, Linköping, Sweden
| | - Mats X. Andersson
- Department of Pediatrics, Göteborg Pediatric Growth Research Center, Institute of Clinical Sciences, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Lena Samuelsson
- Department of Clinical Pathology and Genetics, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Lovisa Lovmar
- Department of Clinical Pathology and Genetics, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Jovanna Dahlgren
- Department of Pediatrics, Göteborg Pediatric Growth Research Center, Institute of Clinical Sciences, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
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Nilsson AK, Andersson MX. The pht4;1-3 mutant line contains a loss of function allele in the Fatty Acid Desaturase 7 gene caused by a remnant inactivated selection marker-a cautionary tale. PeerJ 2017; 5:e4134. [PMID: 29209580 PMCID: PMC5713625 DOI: 10.7717/peerj.4134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Accepted: 11/13/2017] [Indexed: 11/20/2022] Open
Abstract
A striking and unexpected biochemical phenotype was found in an insertion mutant line in the model plant Arabidopsis thaliana. One of two investigated insertion mutant lines in the gene encoding the phosphate transporter PHT4;1 demonstrated a prominent loss of trienoic fatty acids, whereas the other insertion line was indistinguishable from wild type in this aspect. We demonstrate that the loss of trienoic fatty acids was due to a remnant inactive negative selection marker gene in this particular transposon tagged line, pht4;1-3. This constitutes a cautionary tale that warns of the importance to confirm the loss of this type of selection markers and the importance of verifying the relationship between a phenotype and genotype by more than one independent mutant line or alternatively genetic complementation.
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Affiliation(s)
- Anders K Nilsson
- Department of Biology and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Mats X Andersson
- Department of Biology and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
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24
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D'Ambrosio JM, Couto D, Fabro G, Scuffi D, Lamattina L, Munnik T, Andersson MX, Álvarez ME, Zipfel C, Laxalt AM. Phospholipase C2 Affects MAMP-Triggered Immunity by Modulating ROS Production. Plant Physiol 2017; 175:970-981. [PMID: 28827453 PMCID: PMC5619888 DOI: 10.1104/pp.17.00173] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Accepted: 08/18/2017] [Indexed: 05/20/2023]
Abstract
The activation of phosphoinositide-specific phospholipase C (PI-PLC) is one of the earliest responses triggered by the recognition of several microbe-associated molecular patterns (MAMPs) in plants. The Arabidopsis (Arabidopsis thaliana) PI-PLC gene family is composed of nine members. Previous studies suggested a role for PLC2 in MAMP-triggered immunity, as it is rapidly phosphorylated in vivo upon treatment with the bacterial MAMP flg22. Here, we analyzed the role of PLC2 in plant immunity using an artificial microRNA to silence PLC2 expression in Arabidopsis. We found that PLC2-silenced plants are more susceptible to the type III secretion system-deficient bacterial strain Pseudomonas syringae pv tomato (Pst) DC3000 hrcC- and to the nonadapted pea (Pisum sativum) powdery mildew Erysiphe pisi However, PLC2-silenced plants display normal susceptibility to virulent (Pst DC3000) and avirulent (Pst DC3000 AvrRPM1) P. syringae strains, conserving typical hypersensitive response features. In response to flg22, PLC2-silenced plants maintain wild-type mitogen-activated protein kinase activation and PHI1, WRKY33, and FRK1 immune marker gene expression but have reduced reactive oxygen species (ROS)-dependent responses such as callose deposition and stomatal closure. Accordingly, the generation of ROS upon flg22 treatment is compromised in the PLC2-defficient plants, suggesting an effect of PLC2 in a branch of MAMP-triggered immunity and nonhost resistance that involves early ROS-regulated processes. Consistently, PLC2 associates with the NADPH oxidase RBOHD, suggesting its potential regulation by PLC2.
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Affiliation(s)
- Juan Martín D'Ambrosio
- Instituto de Investigaciones Biológicas IIB-Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de Mar del Plata, 7600 Mar del Plata, Argentina
| | - Daniel Couto
- Sainsbury Laboratory, Norwich NR4 7UH, United Kingdom
| | - Georgina Fabro
- Centro de Investigaciones en Química Biológica de Córdoba, UNC-Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de Córdoba, X5000HUA Cordoba, Argentina
| | - Denise Scuffi
- Instituto de Investigaciones Biológicas IIB-Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de Mar del Plata, 7600 Mar del Plata, Argentina
| | - Lorenzo Lamattina
- Instituto de Investigaciones Biológicas IIB-Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de Mar del Plata, 7600 Mar del Plata, Argentina
| | - Teun Munnik
- Swammerdam Institute for Life Sciences, Section Plant Cell Biology, University of Amsterdam, 1098 XH Amsterdam, The Netherlands
| | - Mats X Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, SE-405 30 Gothenburg, Sweden
| | - María E Álvarez
- Centro de Investigaciones en Química Biológica de Córdoba, UNC-Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de Córdoba, X5000HUA Cordoba, Argentina
| | - Cyril Zipfel
- Sainsbury Laboratory, Norwich NR4 7UH, United Kingdom
| | - Ana M Laxalt
- Instituto de Investigaciones Biológicas IIB-Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de Mar del Plata, 7600 Mar del Plata, Argentina
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Ulmann L, Blanckaert V, Mimouni V, Andersson MX, Schoefs B, Chenais B. Microalgal Fatty Acids and Their Implication in Health and Disease. Mini Rev Med Chem 2017; 17:1112-1123. [PMID: 27457215 DOI: 10.2174/1389557516666160722132736] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Revised: 07/18/2016] [Accepted: 07/21/2016] [Indexed: 11/22/2022]
Abstract
BACKGROUND The fatty acids of seed plants and microalgae stored in triglyceride are all produced in the plastid and incorporated into triglycerides by a complex biochemical exchange between the plastid envelope and the endoplasmic reticulum. The oils of seed plants provide the basis for vegetal fat production and the microalgal fats represent an important part of the basal food web of the marine environment. The health-promoting properties of these various sources of fats and in particular the long-chain polyunsaturated fatty acids of marine microalgae are widely recognized. The omega-3 fatty acids are known to have benefits on health and disease. Indeed, alpha-linolenic, eicosapentaenoic (EPA) and docosahexaenoic acids (DHA) are linked to the regulation of mechanisms involved in numerous biological functions associated with cardiovascular disease and cancer prevention. Most EPA and DHA sources for human nutrition are provided by decreasing global stocks of fish. This is one of the reasons why industrial research has been directed towards more sustainable sources of these "marine" lipids. The synthesis of fatty acids and triglycerides are in many respects similar in higher plants and marine algae, but there are also important differences. CONCLUSION This mini-review covers the biochemistry of fatty acid and lipid synthesis in marine microalgae, and the potential health impact of the different fats is also discussed.
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Affiliation(s)
- Lionel Ulmann
- Mer Molécules Santé, Micromar, Université du Maine, Le Mans, France, and IUML, FR3473 CNRS, Le Mans, France
| | - Vincent Blanckaert
- Department of Biology Engineering, University Institute of Technology, Laval, France
| | - Virginie Mimouni
- Department of Biology Engineering, University Institute of Technology, Laval, France
| | - Mats X Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, Goteborg, Sweden
| | - Benoit Schoefs
- Biology Department, School of Sciences and Technology, Le Mans, France
| | - Benoit Chenais
- Mer Molécules Santé, UFR Sciences et Techniques, Université du Maine, Avenue Olivier Messiaen, F-72085 Le Mans Cedex, France
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26
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Najm S, Löfqvist C, Hellgren G, Engström E, Lundgren P, Hård AL, Lapillonne A, Sävman K, Nilsson AK, Andersson MX, Smith LEH, Hellström A. Effects of a lipid emulsion containing fish oil on polyunsaturated fatty acid profiles, growth and morbidities in extremely premature infants: A randomized controlled trial. Clin Nutr ESPEN 2017; 20:17-23. [PMID: 29072164 PMCID: PMC5784264 DOI: 10.1016/j.clnesp.2017.04.004] [Citation(s) in RCA: 91] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Accepted: 04/12/2017] [Indexed: 10/30/2022]
Abstract
BACKGROUND & AIMS The purpose of the study was to compare the effects of the parenteral emulsion SMOFlipid®, with 15% fish oil, with Clinoleic® on retinopathy of prematurity (ROP) and other morbidities and growth, and to compare their impact on longitudinal serum levels of fatty acids. Retinopathy of prematurity, other morbidity and growth were correlated with each parenteral lipid supplement. METHODS Ninety infants born at gestational age <28 weeks were randomized to treatment with SMOFlipid® or Clinoleic®. Two thirds (66%) of the infants received parenteral nutrition for up to 14 days birth (median 8, range 2-14 days), and additional 25% of the infants received for up to 28 days after birth (median 21, range 15-28 days). Cord blood samples and then venous blood samples were obtained at ages 1, 7, 14, and 28 days and at postmenstrual age (PMA) 32, 36, and 40 weeks. Breastmilk was collected at postnatal day 7, and at PMA 32 and 40 weeks. Serum phospholipid and breastmilk total fatty acids were analyzed by gas chromatography-mass spectrometry. Treatment groups were compared with regard to ROP, bronchopulmonary dysplasia, necrotizing enterocolitis, patent ductus arteriosus sepsis and growth between birth and 36 weeks. RESULTS Infants on SMOFlipid® had higher fractions of omega-3 LCPUFA eicosapentaenoic acid (EPA) and slightly higher omega-3 LCPUFA docosahexaenoic acid (DHA) fraction and a decreased arachidonic acid (AA) to DHA ratio from one week after birth up to 32 postmenstrual weeks compared to infants on Clinoleic®. Treatment groups did not differ in morbidities or growth. CONCLUSION Supplementation with SMOFlipid® containing 15% fish oil during parenteral nutrition increased EPA substantially, DHA marginally, reduced AA and decreased AA to DHA ratio. It did not reduce morbidity or affect growth. Since extremely preterm infants accumulate a large deficit of DHA and AA, studies on more prolonged or different levels of DHA and AA supplementation are warranted.
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Affiliation(s)
- Svetlana Najm
- Department of Paediatrics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Chatarina Löfqvist
- Section for Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
| | - Gunnel Hellgren
- Department of Paediatrics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden; Section for Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Eva Engström
- Department of Paediatrics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Pia Lundgren
- Section for Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Anna-Lena Hård
- Section for Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Alexandre Lapillonne
- Department of Neonatology, Paris Descartes University, APHP Necker Hospital, Paris, France
| | - Karin Sävman
- Department of Paediatrics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Anders K Nilsson
- Section for Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Mats X Andersson
- Department of Biology and Environmental Sciences, The Faculty of Science, University of Gothenburg, Gothenburg, Sweden
| | - Lois E H Smith
- The Department of Ophthalmology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
| | - Ann Hellström
- Section for Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
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Nilsson AK, Fahlberg P, Johansson ON, Hamberg M, Andersson MX, Ellerström M. The activity of HYDROPEROXIDE LYASE 1 regulates accumulation of galactolipids containing 12-oxo-phytodienoic acid in Arabidopsis. J Exp Bot 2016; 67:5133-44. [PMID: 27422994 PMCID: PMC5014160 DOI: 10.1093/jxb/erw278] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Arabidopsis produces galactolipids containing esters of 12-oxo-phytodienoic acid (OPDA) and dinor-12-oxo-phytodienoic acid (dnOPDA). These lipids are referred to as arabidopsides and accumulate in response to abiotic and biotic stress. We explored the natural genetic variation found in 14 different Arabidopsis accessions to identify genes involved in the formation of arabidopsides. The accession C24 was identified as a poor accumulator of arabidopsides whereas the commonly used accession Col-0 was found to accumulate comparably large amounts of arabidopsides in response to tissue damage. A quantitative trait loci analysis of an F2 population created from a cross between C24 and Col-0 located a region on chromosome four strongly linked to the capacity to form arabidopsides. Expression analysis of HYDROPEROXIDE LYASE 1 (HPL1) showed large differences in transcript abundance between accessions. Transformation of Col-0 plants with the C24 HPL1 allele under transcriptional regulation of the 35S promoter revealed a strong negative correlation between HPL1 expression and arabidopside accumulation after tissue damage, thereby strengthening the view that HPL1 competes with ALLENE OXIDE SYNTHASE (AOS) for lipid-bound hydroperoxide fatty acids. We further show that the last step in the synthesis of galactolipid-bound OPDA and dnOPDA from unstable allene oxides is exclusively enzyme-catalyzed and not the result of spontaneous cyclization. Thus, the results presented here together with previous studies suggest that all steps in arabidopside biosynthesis are enzyme-dependent and apparently all reactions can take place with substrates being esterified to galactolipids.
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Affiliation(s)
- Anders K Nilsson
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, SE-405 30 Göteborg, Sweden
| | - Per Fahlberg
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, SE-405 30 Göteborg, Sweden
| | - Oskar N Johansson
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, SE-405 30 Göteborg, Sweden
| | - Mats Hamberg
- Division of Chemistry II, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-17 177 Stockholm, Sweden
| | - Mats X Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, SE-405 30 Göteborg, Sweden
| | - Mats Ellerström
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, SE-405 30 Göteborg, Sweden
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Johansson ON, Nilsson AK, Gustavsson MB, Backhaus T, Andersson MX, Ellerström M. A quick and robust method for quantification of the hypersensitive response in plants. PeerJ 2015; 3:e1469. [PMID: 26734506 PMCID: PMC4699783 DOI: 10.7717/peerj.1469] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Accepted: 11/12/2015] [Indexed: 01/28/2023] Open
Abstract
One of the most studied defense reactions of plants against microbial pathogens is the hypersensitive response (HR). The HR is a complex multicellular process that involves programmed cell death at the site of infection. A standard method to quantify plant defense and the HR is to measure the release of cellular electrolytes into water after infiltration with pathogenic bacteria. In this type of experiment, the bacteria are typically delivered into the plant tissue through syringe infiltration. Here we report the development of a vacuum infiltration protocol that allows multiple plant lines to be infiltrated simultaneously and assayed for defense responses. Vacuum infiltration did not induce more wounding response in Arabidopsis leaf tissue than syringe inoculation, whereas throughput and reproducibility were improved. The method was used to study HR-induced electrolyte loss after treatment with the bacterium Pseudomonas syringae pv. tomato DC3000 harboring the effector AvrRpm1, AvrRpt2 or AvrRps4. Specifically, the influence of bacterial titer on AvrRpm1-induced HR was investigated. Not only the amplitude, but also the timing of the maximum rate of the HR reaction was found to be dose-dependent. Finally, using vacuum infiltration, we were able quantify induction of phospholipase D activity after AvrRpm1 recognition in leaves labeled with (33)PO4.
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Affiliation(s)
- Oskar N Johansson
- Department of Biology and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Anders K Nilsson
- Department of Biology and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Mikael B Gustavsson
- Department of Biology and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Thomas Backhaus
- Department of Biology and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Mats X Andersson
- Department of Biology and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Mats Ellerström
- Department of Biology and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
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29
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Nilsson AK, Johansson ON, Fahlberg P, Kommuri M, Töpel M, Bodin LJ, Sikora P, Modarres M, Ekengren S, Nguyen CT, Farmer EE, Olsson O, Ellerström M, Andersson MX. Acylated monogalactosyl diacylglycerol: prevalence in the plant kingdom and identification of an enzyme catalyzing galactolipid head group acylation in Arabidopsis thaliana. Plant J 2015; 84:1152-66. [PMID: 26566971 DOI: 10.1111/tpj.13072] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Revised: 10/25/2015] [Accepted: 11/03/2015] [Indexed: 05/25/2023]
Abstract
The lipid phase of the thylakoid membrane is mainly composed of the galactolipids mono- and digalactosyl diacylglycerol (MGDG and DGDG, respectively). It has been known since the late 1960s that MGDG can be acylated with a third fatty acid to the galactose head group (acyl-MGDG) in plant leaf homogenates. In certain brassicaceous plants like Arabidopsis thaliana, the acyl-MGDG frequently incorporates oxidized fatty acids in the form of the jasmonic acid precursor 12-oxo-phytodienoic acid (OPDA). In the present study we further investigated the distribution of acylated and OPDA-containing galactolipids in the plant kingdom. While acyl-MGDG was found to be ubiquitous in green tissue of plants ranging from non-vascular plants to angiosperms, OPDA-containing galactolipids were only present in plants from a few genera. A candidate protein responsible for the acyl transfer was identified in Avena sativa (oat) leaf tissue using biochemical fractionation and proteomics. Knockout of the orthologous gene in A. thaliana resulted in an almost total elimination of the ability to form both non-oxidized and OPDA-containing acyl-MGDG. In addition, heterologous expression of the A. thaliana gene in E. coli demonstrated that the protein catalyzed acylation of MGDG. We thus demonstrate that a phylogenetically conserved enzyme is responsible for the accumulation of acyl-MGDG in A. thaliana. The activity of this enzyme in vivo is strongly enhanced by freezing damage and the hypersensitive response.
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Affiliation(s)
- Anders K Nilsson
- Department of Biological- and Environmental Sciences, University of Gothenburg, Box 461, Göteborg, SE-405 30, Sweden
| | - Oskar N Johansson
- Department of Biological- and Environmental Sciences, University of Gothenburg, Box 461, Göteborg, SE-405 30, Sweden
| | - Per Fahlberg
- Department of Biological- and Environmental Sciences, University of Gothenburg, Box 461, Göteborg, SE-405 30, Sweden
| | - Murali Kommuri
- Department of Biological- and Environmental Sciences, University of Gothenburg, Box 461, Göteborg, SE-405 30, Sweden
| | - Mats Töpel
- Department of Biological- and Environmental Sciences, University of Gothenburg, Box 461, Göteborg, SE-405 30, Sweden
| | - Lovisa J Bodin
- Department of Biological- and Environmental Sciences, University of Gothenburg, Box 461, Göteborg, SE-405 30, Sweden
| | - Per Sikora
- Department of Biological- and Environmental Sciences, University of Gothenburg, Box 461, Göteborg, SE-405 30, Sweden
| | - Masoomeh Modarres
- Department of Biological- and Environmental Sciences, University of Gothenburg, Box 461, Göteborg, SE-405 30, Sweden
| | - Sophia Ekengren
- Department of Glycoscience, School of Biotechnology, KTH Royal Institute of Technology, Stockholm, SE-106 91, Sweden
| | - Chi T Nguyen
- Department of Plant Molecular Biology, University of Lausanne, Biophore, 1015, Lausanne, Switzerland
| | - Edward E Farmer
- Department of Plant Molecular Biology, University of Lausanne, Biophore, 1015, Lausanne, Switzerland
| | - Olof Olsson
- Department of Pure and Applied Biochemistry, Lund University, Lund, SE-221 00, Sweden
| | - Mats Ellerström
- Department of Biological- and Environmental Sciences, University of Gothenburg, Box 461, Göteborg, SE-405 30, Sweden
| | - Mats X Andersson
- Department of Biological- and Environmental Sciences, University of Gothenburg, Box 461, Göteborg, SE-405 30, Sweden
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30
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Eriksson KM, Johansson CH, Fihlman V, Grehn A, Sanli K, Andersson MX, Blanck H, Arrhenius Å, Sircar T, Backhaus T. Long-term effects of the antibacterial agent triclosan on marine periphyton communities. Environ Toxicol Chem 2015; 34:2067-2077. [PMID: 25904164 DOI: 10.1002/etc.3030] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Revised: 09/25/2014] [Accepted: 04/19/2015] [Indexed: 06/04/2023]
Abstract
Triclosan is a widely used antibacterial agent that has become a ubiquitous contaminant in freshwater, estuary, and marine environments. Concerns about potential adverse effects of triclosan have been described in several recent risk assessments. Its effects on freshwater microbial communities have been well studied, but studies addressing effects on marine microbial communities are scarce. In the present study, the authors describe short- and long-term effects of triclosan on marine periphyton (microbial biofilm) communities. Short-term effects on photosynthesis were estimated after 60 min to 210 min of exposure. Long-term effects on photosynthesis, chlorophyll a fluorescence, pigment content, community tolerance, and bacterial carbon utilization were studied after exposing periphyton for 17 d in flow-through microcosms to 0.316 nM to 10,000 nM triclosan. Results from the short-term studies show that triclosan is toxic to periphyton photosynthesis. Half maximal effective concentration (EC50) values of 1080 nM and 3000 nM were estimated using (14)CO2-incorporation and pulse amplitude modulation (PAM) fluorescence measurements, respectively. After long-term triclosan exposure in flow-through microcosms, photosynthesis estimated using PAM fluorometry was not inhibited by triclosan concentrations up to 1000 nM but instead increased with increasing triclosan concentration. Similarly, at exposure concentrations of 31.6 nM and higher, triclosan caused an increase in photosynthetic pigments. At 316 nM triclosan, the pigment amounts were increased by a factor of 1.4 to 1.9 compared with the control level. Pollution-induced community tolerance was observed for algae and cyanobacteria at 100 nM triclosan and higher. Despite the widespread use of triclosan as an antibacterial agent, the compound did not have any effects on bacterial carbon utilization after long-term exposure.
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Affiliation(s)
- K Martin Eriksson
- Department of Shipping and Marine Technology, Chalmers University of Technology, Gothenburg, Sweden
| | - C Henrik Johansson
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Viktor Fihlman
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Alexander Grehn
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Kemal Sanli
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Mats X Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Hans Blanck
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Åsa Arrhenius
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Triranta Sircar
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Thomas Backhaus
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
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31
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Adolfsson L, Solymosi K, Andersson MX, Keresztes Á, Uddling J, Schoefs B, Spetea C. Mycorrhiza symbiosis increases the surface for sunlight capture in Medicago truncatula for better photosynthetic production. PLoS One 2015; 10:e0115314. [PMID: 25615871 PMCID: PMC4304716 DOI: 10.1371/journal.pone.0115314] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Accepted: 11/22/2014] [Indexed: 11/29/2022] Open
Abstract
Arbuscular mycorrhizal (AM) fungi play a prominent role in plant nutrition by supplying mineral nutrients, particularly inorganic phosphate (Pi), and also constitute an important carbon sink. AM stimulates plant growth and development, but the underlying mechanisms are not well understood. In this study, Medicago truncatula plants were grown with Rhizophagus irregularis BEG141 inoculum (AM), mock inoculum (control) or with P(i) fertilization. We hypothesized that AM stimulates plant growth through either modifications of leaf anatomy or photosynthetic activity per leaf area. We investigated whether these effects are shared with P(i) fertilization, and also assessed the relationship between levels of AM colonization and these effects. We found that increased P(i) supply by either mycorrhization or fertilization led to improved shoot growth associated with increased nitrogen uptake and carbon assimilation. Both mycorrhized and P(i)-fertilized plants had more and longer branches with larger and thicker leaves than the control plants, resulting in an increased photosynthetically active area. AM-specific effects were earlier appearance of the first growth axes and increased number of chloroplasts per cell section, since they were not induced by P(i) fertilization. Photosynthetic activity per leaf area remained the same regardless of type of treatment. In conclusion, the increase in growth of mycorrhized and P(i)-fertilized Medicago truncatula plants is linked to an increase in the surface for sunlight capture, hence increasing their photosynthetic production, rather than to an increase in the photosynthetic activity per leaf area.
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Affiliation(s)
- Lisa Adolfsson
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, 405 30 Gothenburg, Sweden
| | - Katalin Solymosi
- Department of Plant Anatomy, Eötvös Loránd University, H-1117 Budapest, Hungary
| | - Mats X. Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, 405 30 Gothenburg, Sweden
| | - Áron Keresztes
- Department of Plant Anatomy, Eötvös Loránd University, H-1117 Budapest, Hungary
| | - Johan Uddling
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, 405 30 Gothenburg, Sweden
| | - Benoît Schoefs
- Mer, Molécules, Santé, MicroMar—EA2160, LUNAM Université, IUML – FR 3473 CNRS, University of Le Mans, 72085 Le Mans Cedex 9, France
| | - Cornelia Spetea
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, 405 30 Gothenburg, Sweden
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32
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Yin C, Andersson MX, Zhang H, Aronsson H. Phosphatidylcholine is transferred from chemically-defined liposomes to chloroplasts through proteins of the chloroplast outer envelope membrane. FEBS Lett 2015; 589:177-81. [PMID: 25479091 DOI: 10.1016/j.febslet.2014.11.044] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Revised: 11/24/2014] [Accepted: 11/24/2014] [Indexed: 10/24/2022]
Abstract
Chloroplasts maintain their lipid balance through a tight interplay with the endoplasmic reticulum (ER). The outer envelope membrane of chloroplasts contains a large proportion of the phospholipid phosphatidylcholine (PC), which is synthesized in the ER and also a possible precursor for thylakoid galactolipids. The mechanism for PC transport from the ER to chloroplasts is not known. Using isolated chloroplasts and liposomes containing radiolabeled PC we investigated non-vesicular transport of PC in vitro. PC uptake in chloroplasts was time and temperature dependent, but nucleotide independent. Increased radius of liposomes stimulated PC uptake, and protease treatment of the chloroplasts impaired PC uptake. This implies that the chloroplast outer envelopes contains an exposed proteinaceous machinery for the uptake of PC from closely apposed membranes.
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Affiliation(s)
- Congfei Yin
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing, People's Republic of China; Department of Biological and Environmental Sciences, University of Gothenburg, SE-405 30 Gothenburg, Sweden
| | - Mats X Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, SE-405 30 Gothenburg, Sweden
| | - Hongsheng Zhang
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing, People's Republic of China.
| | - Henrik Aronsson
- Department of Biological and Environmental Sciences, University of Gothenburg, SE-405 30 Gothenburg, Sweden.
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33
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Andersson MX, Nilsson AK, Johansson ON, Boztaş G, Adolfsson LE, Pinosa F, Petit CG, Aronsson H, Mackey D, Tör M, Hamberg M, Ellerström M. Involvement of the electrophilic isothiocyanate sulforaphane in Arabidopsis local defense responses. Plant Physiol 2015; 167:251-61. [PMID: 25371552 PMCID: PMC4281013 DOI: 10.1104/pp.114.251892] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2014] [Accepted: 11/03/2014] [Indexed: 05/18/2023]
Abstract
Plants defend themselves against microbial pathogens through a range of highly sophisticated and integrated molecular systems. Recognition of pathogen-secreted effector proteins often triggers the hypersensitive response (HR), a complex multicellular defense reaction where programmed cell death of cells surrounding the primary site of infection is a prominent feature. Even though the HR was described almost a century ago, cell-to-cell factors acting at the local level generating the full defense reaction have remained obscure. In this study, we sought to identify diffusible molecules produced during the HR that could induce cell death in naive tissue. We found that 4-methylsulfinylbutyl isothiocyanate (sulforaphane) is released by Arabidopsis (Arabidopsis thaliana) leaf tissue undergoing the HR and that this compound induces cell death as well as primes defense in naive tissue. Two different mutants impaired in the pathogen-induced accumulation of sulforaphane displayed attenuated programmed cell death upon bacterial and oomycete effector recognition as well as decreased resistance to several isolates of the plant pathogen Hyaloperonospora arabidopsidis. Treatment with sulforaphane provided protection against a virulent H. arabidopsidis isolate. Glucosinolate breakdown products are recognized as antifeeding compounds toward insects and recently also as intracellular signaling and bacteriostatic molecules in Arabidopsis. The data presented here indicate that these compounds also trigger local defense responses in Arabidopsis tissue.
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Affiliation(s)
- Mats X Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, SE-405 30 Gothenburg, Sweden (M.X.A., A.K.N., O.N.J., L.E.A., F.P., C.G.P., H.A., M.E.);National Pollen and Aerobiology Research Unit, Institute of Science and the Environment, University of Worcester, Worcester WR2 6AJ, United Kingdom (G.B., M.T.);Departments of Horticulture and Crop Science and Molecular Genetics, Ohio State University, Columbus, Ohio 43210 (D.M.); andDivision of Chemistry II, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-17177 Stockholm, Sweden (M.H.)
| | - Anders K Nilsson
- Department of Biological and Environmental Sciences, University of Gothenburg, SE-405 30 Gothenburg, Sweden (M.X.A., A.K.N., O.N.J., L.E.A., F.P., C.G.P., H.A., M.E.);National Pollen and Aerobiology Research Unit, Institute of Science and the Environment, University of Worcester, Worcester WR2 6AJ, United Kingdom (G.B., M.T.);Departments of Horticulture and Crop Science and Molecular Genetics, Ohio State University, Columbus, Ohio 43210 (D.M.); andDivision of Chemistry II, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-17177 Stockholm, Sweden (M.H.)
| | - Oskar N Johansson
- Department of Biological and Environmental Sciences, University of Gothenburg, SE-405 30 Gothenburg, Sweden (M.X.A., A.K.N., O.N.J., L.E.A., F.P., C.G.P., H.A., M.E.);National Pollen and Aerobiology Research Unit, Institute of Science and the Environment, University of Worcester, Worcester WR2 6AJ, United Kingdom (G.B., M.T.);Departments of Horticulture and Crop Science and Molecular Genetics, Ohio State University, Columbus, Ohio 43210 (D.M.); andDivision of Chemistry II, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-17177 Stockholm, Sweden (M.H.)
| | - Gülin Boztaş
- Department of Biological and Environmental Sciences, University of Gothenburg, SE-405 30 Gothenburg, Sweden (M.X.A., A.K.N., O.N.J., L.E.A., F.P., C.G.P., H.A., M.E.);National Pollen and Aerobiology Research Unit, Institute of Science and the Environment, University of Worcester, Worcester WR2 6AJ, United Kingdom (G.B., M.T.);Departments of Horticulture and Crop Science and Molecular Genetics, Ohio State University, Columbus, Ohio 43210 (D.M.); andDivision of Chemistry II, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-17177 Stockholm, Sweden (M.H.)
| | - Lisa E Adolfsson
- Department of Biological and Environmental Sciences, University of Gothenburg, SE-405 30 Gothenburg, Sweden (M.X.A., A.K.N., O.N.J., L.E.A., F.P., C.G.P., H.A., M.E.);National Pollen and Aerobiology Research Unit, Institute of Science and the Environment, University of Worcester, Worcester WR2 6AJ, United Kingdom (G.B., M.T.);Departments of Horticulture and Crop Science and Molecular Genetics, Ohio State University, Columbus, Ohio 43210 (D.M.); andDivision of Chemistry II, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-17177 Stockholm, Sweden (M.H.)
| | - Francesco Pinosa
- Department of Biological and Environmental Sciences, University of Gothenburg, SE-405 30 Gothenburg, Sweden (M.X.A., A.K.N., O.N.J., L.E.A., F.P., C.G.P., H.A., M.E.);National Pollen and Aerobiology Research Unit, Institute of Science and the Environment, University of Worcester, Worcester WR2 6AJ, United Kingdom (G.B., M.T.);Departments of Horticulture and Crop Science and Molecular Genetics, Ohio State University, Columbus, Ohio 43210 (D.M.); andDivision of Chemistry II, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-17177 Stockholm, Sweden (M.H.)
| | - Christel Garcia Petit
- Department of Biological and Environmental Sciences, University of Gothenburg, SE-405 30 Gothenburg, Sweden (M.X.A., A.K.N., O.N.J., L.E.A., F.P., C.G.P., H.A., M.E.);National Pollen and Aerobiology Research Unit, Institute of Science and the Environment, University of Worcester, Worcester WR2 6AJ, United Kingdom (G.B., M.T.);Departments of Horticulture and Crop Science and Molecular Genetics, Ohio State University, Columbus, Ohio 43210 (D.M.); andDivision of Chemistry II, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-17177 Stockholm, Sweden (M.H.)
| | - Henrik Aronsson
- Department of Biological and Environmental Sciences, University of Gothenburg, SE-405 30 Gothenburg, Sweden (M.X.A., A.K.N., O.N.J., L.E.A., F.P., C.G.P., H.A., M.E.);National Pollen and Aerobiology Research Unit, Institute of Science and the Environment, University of Worcester, Worcester WR2 6AJ, United Kingdom (G.B., M.T.);Departments of Horticulture and Crop Science and Molecular Genetics, Ohio State University, Columbus, Ohio 43210 (D.M.); andDivision of Chemistry II, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-17177 Stockholm, Sweden (M.H.)
| | - David Mackey
- Department of Biological and Environmental Sciences, University of Gothenburg, SE-405 30 Gothenburg, Sweden (M.X.A., A.K.N., O.N.J., L.E.A., F.P., C.G.P., H.A., M.E.);National Pollen and Aerobiology Research Unit, Institute of Science and the Environment, University of Worcester, Worcester WR2 6AJ, United Kingdom (G.B., M.T.);Departments of Horticulture and Crop Science and Molecular Genetics, Ohio State University, Columbus, Ohio 43210 (D.M.); andDivision of Chemistry II, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-17177 Stockholm, Sweden (M.H.)
| | - Mahmut Tör
- Department of Biological and Environmental Sciences, University of Gothenburg, SE-405 30 Gothenburg, Sweden (M.X.A., A.K.N., O.N.J., L.E.A., F.P., C.G.P., H.A., M.E.);National Pollen and Aerobiology Research Unit, Institute of Science and the Environment, University of Worcester, Worcester WR2 6AJ, United Kingdom (G.B., M.T.);Departments of Horticulture and Crop Science and Molecular Genetics, Ohio State University, Columbus, Ohio 43210 (D.M.); andDivision of Chemistry II, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-17177 Stockholm, Sweden (M.H.)
| | - Mats Hamberg
- Department of Biological and Environmental Sciences, University of Gothenburg, SE-405 30 Gothenburg, Sweden (M.X.A., A.K.N., O.N.J., L.E.A., F.P., C.G.P., H.A., M.E.);National Pollen and Aerobiology Research Unit, Institute of Science and the Environment, University of Worcester, Worcester WR2 6AJ, United Kingdom (G.B., M.T.);Departments of Horticulture and Crop Science and Molecular Genetics, Ohio State University, Columbus, Ohio 43210 (D.M.); andDivision of Chemistry II, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-17177 Stockholm, Sweden (M.H.)
| | - Mats Ellerström
- Department of Biological and Environmental Sciences, University of Gothenburg, SE-405 30 Gothenburg, Sweden (M.X.A., A.K.N., O.N.J., L.E.A., F.P., C.G.P., H.A., M.E.);National Pollen and Aerobiology Research Unit, Institute of Science and the Environment, University of Worcester, Worcester WR2 6AJ, United Kingdom (G.B., M.T.);Departments of Horticulture and Crop Science and Molecular Genetics, Ohio State University, Columbus, Ohio 43210 (D.M.); andDivision of Chemistry II, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-17177 Stockholm, Sweden (M.H.)
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Johansson ON, Fantozzi E, Fahlberg P, Nilsson AK, Buhot N, Tör M, Andersson MX. Role of the penetration-resistance genes PEN1, PEN2 and PEN3 in the hypersensitive response and race-specific resistance in Arabidopsis thaliana. Plant J 2014; 79:466-76. [PMID: 24889055 DOI: 10.1111/tpj.12571] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 05/20/2014] [Accepted: 05/23/2014] [Indexed: 05/21/2023]
Abstract
Plants are highly capable of recognizing and defending themselves against invading microbes. Adapted plant pathogens secrete effector molecules to suppress the host's immune system. These molecules may be recognized by host-encoded resistance proteins, which then trigger defense in the form of the hypersensitive response (HR) leading to programmed cell death of the host tissue at the infection site. The three proteins PEN1, PEN2 and PEN3 have been found to act as central components in cell wall-based defense against the non-adapted powdery mildew Blumeria graminis fsp. hordei (Bgh). We found that loss of function mutations in any of the three PEN genes cause decreased hypersensitive cell death triggered by recognition of effectors from oomycete and bacterial pathogens in Arabidopsis. There were considerable additive effects of the mutations. The HR induced by recognition of AvrRpm1 was almost completely abolished in the pen2 pen3 and pen1 pen3 double mutants and the loss of cell death could be linked to indole glucosinolate breakdown products. However, the loss of the HR in pen double mutants did not affect the plants' ability to restrict bacterial growth, whereas resistance to avirulent isolates of the oomycete Hyaloperonospora arabidopsidis was strongly compromised. In contrast, the double and triple mutants demonstrated varying degrees of run-away cell death in response to Bgh. Taken together, our results indicate that the three genes PEN1, PEN2 and PEN3 extend in functionality beyond their previously recognized functions in cell wall-based defense against non-host pathogens.
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Affiliation(s)
- Oskar N Johansson
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, Göteborg, SE-405 30, Sweden
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Nilsson AK, Johansson ON, Fahlberg P, Steinhart F, Gustavsson MB, Ellerström M, Andersson MX. Formation of oxidized phosphatidylinositol and 12-oxo-phytodienoic acid containing acylated phosphatidylglycerol during the hypersensitive response in Arabidopsis. Phytochemistry 2014; 101:65-75. [PMID: 24559746 DOI: 10.1016/j.phytochem.2014.01.020] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Revised: 01/27/2014] [Accepted: 01/27/2014] [Indexed: 05/08/2023]
Abstract
Plant membranes are composed of a wide array of polar lipids. The functionality of these extends far beyond a pure structural role. Membrane lipids function as enzyme co-factors, establish organelle identity and as substrates for enzymes such as lipases and lipoxygenases. Enzymatic degradation or oxidation (enzymatic or non-enzymatic) of membrane lipids leads to the formation of a diverse group of bioactive compounds. Plant defense reactions provoked by pathogenic microorganisms are often associated with substantial modifications of the lipidome. In this study, we profiled changes in phospholipids during the hypersensitive response triggered by recognition of the bacterial effector protein AvrRpm1 in Arabidopsis thaliana. A simple and robust LC-MS based method for profiling plant lipids was designed to separate all the major species of glycerolipids extracted from Arabidopsis leaf tissue. The method efficiently separated several isobaric and near isobaric lipid species, which otherwise are difficult to quantify in direct infusion based profiling. In addition to the previously reported OPDA-containing galactolipids found to be induced during hypersensitive response in Arabidopsis, three OPDA-containing sulfoquinovosyl diacylglycerol species, one phosphatidylinositol species as well as two acylated OPDA-containing phosphatidylglycerol species were found to accumulate during the hypersensitive response in Arabidopsis. Our study confirms and extends on the notion that the hypersensitive response in Arabidopsis triggers a unique profile of Allene Oxide Synthase dependent oxidation of membrane lipids. Primary targets of this oxidation seem to be uncharged and anionic lipid species.
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Affiliation(s)
- Anders K Nilsson
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, SE-405 30 Göteborg, Sweden
| | - Oskar N Johansson
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, SE-405 30 Göteborg, Sweden
| | - Per Fahlberg
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, SE-405 30 Göteborg, Sweden
| | - Feray Steinhart
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, SE-405 30 Göteborg, Sweden
| | - Mikael B Gustavsson
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, SE-405 30 Göteborg, Sweden
| | - Mats Ellerström
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, SE-405 30 Göteborg, Sweden
| | - Mats X Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, SE-405 30 Göteborg, Sweden.
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Xu D, Li J, Gangappa SN, Hettiarachchi C, Lin F, Andersson MX, Jiang Y, Deng XW, Holm M. Convergence of Light and ABA signaling on the ABI5 promoter. PLoS Genet 2014; 10:e1004197. [PMID: 24586210 PMCID: PMC3937224 DOI: 10.1371/journal.pgen.1004197] [Citation(s) in RCA: 128] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2013] [Accepted: 01/08/2014] [Indexed: 12/11/2022] Open
Abstract
Light is one of the most important environmental cues regulating multiple aspects of plant growth and development, and abscisic acid (ABA) is a plant hormone that plays important roles during many phases of the plant life cycle and in plants' responses to various environmental stresses. How plants integrate the external light signal with endogenous ABA pathway for better adaptation and survival remains poorly understood. Here, we show that BBX21 (also known as SALT TOLERANCE HOMOLOG 2), a B-box (BBX) protein previously shown to positively regulate seedling photomorphogenesis, is also involved in ABA signaling. Our genetic data show that BBX21 may act upstream of several ABA INSENSITIVE (ABI) genes and ELONGATED HYPOCOTYL 5 (HY5) in ABA control of seed germination. Previous studies showed that HY5 acts as a direct activator of ABI5 expression, and that BBX21 interacts with HY5. We further demonstrate that BBX21 negatively regulates ABI5 expression by interfering with HY5 binding to the ABI5 promoter. In addition, ABI5 was shown to directly activate its own expression, whereas BBX21 negatively regulates this activity by directly interacting with ABI5. Together, our study indicates that BBX21 coordinates with HY5 and ABI5 on the ABI5 promoter and that these transcriptional regulators work in concert to integrate light and ABA signaling in Arabidopsis thaliana. Many factors such as light, phytohormone abscisic acid (ABA), etc., regulate multiple developmental processes throughout the plants' life cycle. Light promotes seed germination and ABA maintains seed dormancy. However, little is known about how light and ABA signaling pathways interact with each other. It was previously reported that Arabidopsis HY5, a well-known bZIP transcription factor involved in promoting seedling photomorphogenesis, is involved in ABA signaling by directly activating ABI5 expression. Here, we report that the B-box protein BBX21 negatively regulates ABI5 expression by interfering with HY5 binding to the ABI5 promoter. Interestingly, ABI5 was shown to directly bind to its own promoter and activate its expression, whereas BBX21 also negatively regulates this activity by interacting with ABI5. Together, our study shows that light and ABA signaling pathways converge on the ABI5 promoter, on which BBX21 acts as a negative regulator of ABI5 expression.
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Affiliation(s)
- Dongqing Xu
- Department of Biological and Environmental Sciences, Gothenburg University, Gothenburg, Sweden
- Peking-Yale Joint Center for Plant Molecular Genetics and Agro-Biotechnology, State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing, China
| | - Jigang Li
- Peking-Yale Joint Center for Plant Molecular Genetics and Agro-Biotechnology, State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing, China
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing, China
- Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, Connecticut, United States of America
| | - Sreeramaiah N. Gangappa
- Department of Biological and Environmental Sciences, Gothenburg University, Gothenburg, Sweden
| | - Chamari Hettiarachchi
- Department of Biological and Environmental Sciences, Gothenburg University, Gothenburg, Sweden
| | - Fang Lin
- Peking-Yale Joint Center for Plant Molecular Genetics and Agro-Biotechnology, State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing, China
| | - Mats X. Andersson
- Department of Biological and Environmental Sciences, Gothenburg University, Gothenburg, Sweden
| | - Yan Jiang
- Department of Biological and Environmental Sciences, Gothenburg University, Gothenburg, Sweden
| | - Xing Wang Deng
- Peking-Yale Joint Center for Plant Molecular Genetics and Agro-Biotechnology, State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing, China
- Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, Connecticut, United States of America
- * E-mail:
| | - Magnus Holm
- Department of Biological and Environmental Sciences, Gothenburg University, Gothenburg, Sweden
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Johansson ON, Fahlberg P, Karimi E, Nilsson AK, Ellerström M, Andersson MX. Redundancy among phospholipase D isoforms in resistance triggered by recognition of the Pseudomonas syringae effector AvrRpm1 in Arabidopsis thaliana. Front Plant Sci 2014; 5:639. [PMID: 25431578 PMCID: PMC4230166 DOI: 10.3389/fpls.2014.00639] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Accepted: 10/28/2014] [Indexed: 05/06/2023]
Abstract
Plants possess a highly sophisticated system for defense against microorganisms. So called MAMP (microbe-associated molecular patterns) triggered immunity (MTI) prevents the majority of non-adapted pathogens from causing disease. Adapted plant pathogens use secreted effector proteins to interfere with such signaling. Recognition of microbial effectors or their activity by plant resistance (R)-proteins triggers a second line of defense resulting in effector triggered immunity (ETI). The latter usually comprises the hypersensitive response (HR) which includes programmed cell death at the site of infection. Phospholipase D (PLD) mediated production of phosphatidic acid (PA) has been linked to both MTI and ETI in plants. Inhibition of PLD activity has been shown to attenuate MTI as well as ETI. In this study, we systematically tested single and double knockouts in all 12 genes encoding PLDs in Arabidopsis thaliana for effects on ETI and MTI. No single PLD could be linked to ETI triggered by recognition of effectors secreted by the bacterium Pseudomonas syringae. However, repression of PLD dependent PA production by n-butanol strongly inhibited the HR following Pseudomonas syringae effector recognition. In addition some pld mutants were more sensitive to n-butanol than wild type. Thus, the effect of mutations of PLDs could become detectable, and the corresponding genes can be proposed to be involved in the HR. Only knockout of PLDδ caused a loss of MTI-induced cell wall based defense against the non-host powdery mildew Erysiphe pisi. This is thus in stark contrast to the involvement of a multitude of PLD isoforms in the HR triggered by AvrRpm1 recognition.
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Affiliation(s)
- Oskar N. Johansson
- Department of Biology and Environmental Sciences, University of GothenburgGothenburg, Sweden
| | - Per Fahlberg
- Department of Biology and Environmental Sciences, University of GothenburgGothenburg, Sweden
| | - Elham Karimi
- Department of Plant Pathology, Faculty of Agriculture, Tarbiat Modares UniversityTehran, Iran
| | - Anders K. Nilsson
- Department of Biology and Environmental Sciences, University of GothenburgGothenburg, Sweden
| | - Mats Ellerström
- Department of Biology and Environmental Sciences, University of GothenburgGothenburg, Sweden
| | - Mats X. Andersson
- Department of Biology and Environmental Sciences, University of GothenburgGothenburg, Sweden
- *Correspondence: Mats X. Andersson, Department of Biology and Environmental Sciences, University of Gothenburg, Box 461, SE-405 30 Gothenburg, Sweden e-mail:
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Pinosa F, Buhot N, Kwaaitaal M, Fahlberg P, Thordal-Christensen H, Ellerström M, Andersson MX. Arabidopsis phospholipase dδ is involved in basal defense and nonhost resistance to powdery mildew fungi. Plant Physiol 2013; 163:896-906. [PMID: 23979971 PMCID: PMC3793066 DOI: 10.1104/pp.113.223503] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Accepted: 08/25/2013] [Indexed: 05/11/2023]
Abstract
Plants have evolved a complex array of defensive responses against pathogenic microorganisms. Recognition of microbes initiates signaling cascades that activate plant defenses. The membrane lipid phosphatidic acid, produced by phospholipase D (PLD), has been shown to take part in both abiotic and biotic stress signaling. In this study, the involvement of PLD in the interaction between Arabidopsis (Arabidopsis thaliana) and the barley powdery mildew fungus Blumeria graminis f. sp. hordei (Bgh) was investigated. This nonadapted pathogen is normally resisted by a cell wall-based defense, which stops the fungal hyphae from penetrating the epidermal cell wall. Chemical inhibition of phosphatidic acid production by PLD increased the penetration rate of Bgh spores on wild-type leaves. The analysis of transfer DNA knockout lines for all Arabidopsis PLD genes revealed that PLDδ is involved in penetration resistance against Bgh, and chemical inhibition of PLDs in plants mutated in PLDδ indicated that this isoform alone is involved in Bgh resistance. In addition, we confirmed the involvement of PLDδ in penetration resistance against another nonadapted pea powdery mildew fungus, Erysiphe pisi. A green fluorescent protein fusion of PLDδ localized to the plasma membrane at the Bgh attack site, where it surrounded the cell wall reinforcement. Furthermore, in the pldδ mutant, transcriptional up-regulation of early microbe-associated molecular pattern response genes was delayed after chitin stimulation. In conclusion, we propose that PLD is involved in defense signaling in nonhost resistance against powdery mildew fungi and put PLDδ forward as the main isoform participating in this process.
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Affiliation(s)
- Francesco Pinosa
- Department of Biological and Environmental Sciences, University of Gothenburg, SE–405 30 Gothenburg, Sweden (F.P., N.B., P.F., M.E., M.X.A.); and
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, DK–1871 Frederiksberg C, Denmark (M.K., H.T.-C.)
| | - Nathalie Buhot
- Department of Biological and Environmental Sciences, University of Gothenburg, SE–405 30 Gothenburg, Sweden (F.P., N.B., P.F., M.E., M.X.A.); and
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, DK–1871 Frederiksberg C, Denmark (M.K., H.T.-C.)
| | - Mark Kwaaitaal
- Department of Biological and Environmental Sciences, University of Gothenburg, SE–405 30 Gothenburg, Sweden (F.P., N.B., P.F., M.E., M.X.A.); and
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, DK–1871 Frederiksberg C, Denmark (M.K., H.T.-C.)
| | - Per Fahlberg
- Department of Biological and Environmental Sciences, University of Gothenburg, SE–405 30 Gothenburg, Sweden (F.P., N.B., P.F., M.E., M.X.A.); and
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, DK–1871 Frederiksberg C, Denmark (M.K., H.T.-C.)
| | - Hans Thordal-Christensen
- Department of Biological and Environmental Sciences, University of Gothenburg, SE–405 30 Gothenburg, Sweden (F.P., N.B., P.F., M.E., M.X.A.); and
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, DK–1871 Frederiksberg C, Denmark (M.K., H.T.-C.)
| | - Mats Ellerström
- Department of Biological and Environmental Sciences, University of Gothenburg, SE–405 30 Gothenburg, Sweden (F.P., N.B., P.F., M.E., M.X.A.); and
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, DK–1871 Frederiksberg C, Denmark (M.K., H.T.-C.)
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Li-Beisson Y, Shorrosh B, Beisson F, Andersson MX, Arondel V, Bates PD, Baud S, Bird D, DeBono A, Durrett TP, Franke RB, Graham IA, Katayama K, Kelly AA, Larson T, Markham JE, Miquel M, Molina I, Nishida I, Rowland O, Samuels L, Schmid KM, Wada H, Welti R, Xu C, Zallot R, Ohlrogge J. Acyl-lipid metabolism. Arabidopsis Book 2013; 11:e0161. [PMID: 23505340 PMCID: PMC3563272 DOI: 10.1199/tab.0161] [Citation(s) in RCA: 677] [Impact Index Per Article: 61.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Acyl lipids in Arabidopsis and all other plants have a myriad of diverse functions. These include providing the core diffusion barrier of the membranes that separates cells and subcellular organelles. This function alone involves more than 10 membrane lipid classes, including the phospholipids, galactolipids, and sphingolipids, and within each class the variations in acyl chain composition expand the number of structures to several hundred possible molecular species. Acyl lipids in the form of triacylglycerol account for 35% of the weight of Arabidopsis seeds and represent their major form of carbon and energy storage. A layer of cutin and cuticular waxes that restricts the loss of water and provides protection from invasions by pathogens and other stresses covers the entire aerial surface of Arabidopsis. Similar functions are provided by suberin and its associated waxes that are localized in roots, seed coats, and abscission zones and are produced in response to wounding. This chapter focuses on the metabolic pathways that are associated with the biosynthesis and degradation of the acyl lipids mentioned above. These pathways, enzymes, and genes are also presented in detail in an associated website (ARALIP: http://aralip.plantbiology.msu.edu/). Protocols and methods used for analysis of Arabidopsis lipids are provided. Finally, a detailed summary of the composition of Arabidopsis lipids is provided in three figures and 15 tables.
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40
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Li-Beisson Y, Shorrosh B, Beisson F, Andersson MX, Arondel V, Bates PD, Baud S, Bird D, Debono A, Durrett TP, Franke RB, Graham IA, Katayama K, Kelly AA, Larson T, Markham JE, Miquel M, Molina I, Nishida I, Rowland O, Samuels L, Schmid KM, Wada H, Welti R, Xu C, Zallot R, Ohlrogge J. Acyl-lipid metabolism. Arabidopsis Book 2013. [PMID: 23505340 DOI: 10.1199/tab.0161m] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Acyl lipids in Arabidopsis and all other plants have a myriad of diverse functions. These include providing the core diffusion barrier of the membranes that separates cells and subcellular organelles. This function alone involves more than 10 membrane lipid classes, including the phospholipids, galactolipids, and sphingolipids, and within each class the variations in acyl chain composition expand the number of structures to several hundred possible molecular species. Acyl lipids in the form of triacylglycerol account for 35% of the weight of Arabidopsis seeds and represent their major form of carbon and energy storage. A layer of cutin and cuticular waxes that restricts the loss of water and provides protection from invasions by pathogens and other stresses covers the entire aerial surface of Arabidopsis. Similar functions are provided by suberin and its associated waxes that are localized in roots, seed coats, and abscission zones and are produced in response to wounding. This chapter focuses on the metabolic pathways that are associated with the biosynthesis and degradation of the acyl lipids mentioned above. These pathways, enzymes, and genes are also presented in detail in an associated website (ARALIP: http://aralip.plantbiology.msu.edu/). Protocols and methods used for analysis of Arabidopsis lipids are provided. Finally, a detailed summary of the composition of Arabidopsis lipids is provided in three figures and 15 tables.
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Yin L, Fristedt R, Herdean A, Solymosi K, Bertrand M, Andersson MX, Mamedov F, Vener AV, Schoefs B, Spetea C. Photosystem II function and dynamics in three widely used Arabidopsis thaliana accessions. PLoS One 2012; 7:e46206. [PMID: 23029436 PMCID: PMC3460815 DOI: 10.1371/journal.pone.0046206] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2012] [Accepted: 08/30/2012] [Indexed: 12/23/2022] Open
Abstract
Columbia-0 (Col-0), Wassilewskija-4 (Ws-4), and Landsberg erecta-0 (Ler-0) are used as background lines for many public Arabidopsis mutant collections, and for investigation in laboratory conditions of plant processes, including photosynthesis and response to high-intensity light (HL). The photosystem II (PSII) complex is sensitive to HL and requires repair to sustain its function. PSII repair is a multistep process controlled by numerous factors, including protein phosphorylation and thylakoid membrane stacking. Here we have characterized the function and dynamics of PSII complex under growth-light and HL conditions. Ws-4 displayed 30% more thylakoid lipids per chlorophyll and 40% less chlorophyll per carotenoid than Col-0 and Ler-0. There were no large differences in thylakoid stacking, photoprotection and relative levels of photosynthetic complexes among the three accessions. An increased efficiency of PSII closure was found in Ws-4 following illumination with saturation flashes or continuous light. Phosphorylation of the PSII D1/D2 proteins was reduced by 50% in Ws-4 as compared to Col-0 and Ler-0. An increase in abundance of the responsible STN8 kinase in response to HL treatment was found in all three accessions, but Ws-4 displayed 50% lower levels than Col-0 and Ler-0. Despite this, the HL treatment caused in Ws-4 the lagest extent of PSII inactivation, disassembly, D1 protein degradation, and the largest decrease in the size of stacked thylakoids. The dilution of chlorophyll-protein complexes with additional lipids and carotenoids in Ws-4 may represent a mechanism to facilitate lateral protein traffic in the membrane, thus compensating for the lack of a full complement of STN8 kinase. Nevertheless, additional PSII damage occurs in Ws-4, which exceeds the D1 protein synthesis capacity, thus leading to enhanced photoinhibition. Our findings are valuable for selection of appropriate background line for PSII characterization in Arabidopsis mutants, and also provide the first insights into natural variation of PSII protein phosphorylation.
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Affiliation(s)
- Lan Yin
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Rikard Fristedt
- Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden
| | - Andrei Herdean
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Katalin Solymosi
- Department of Plant Anatomy, Eötvös University, Budapest, Hungary
| | - Martine Bertrand
- National Institute for Marine Sciences and Techniques, Cnam, Cherbourg-Octeville, France
| | - Mats X. Andersson
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Fikret Mamedov
- Department of Chemistry - Ångström Laboratory, Uppsala University, Uppsala, Sweden
| | - Alexander V. Vener
- Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden
| | - Benoît Schoefs
- Mer Molécules Santé, EA2160, LUNAM Université, Université du Maine à Le Mans, Le Mans, France
| | - Cornelia Spetea
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
- * E-mail:
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Nilsson AK, Fahlberg P, Ellerström M, Andersson MX. Oxo-phytodienoic acid (OPDA) is formed on fatty acids esterified to galactolipids after tissue disruption in Arabidopsis thaliana. FEBS Lett 2012; 586:2483-7. [PMID: 22728240 DOI: 10.1016/j.febslet.2012.06.010] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2012] [Revised: 06/03/2012] [Accepted: 06/07/2012] [Indexed: 11/28/2022]
Abstract
Biotic and abiotic stress induces the formation of galactolipids esterified with the phytohormones 12-oxo-phytodienoic acid (OPDA) and dinor-oxo-phytodienoic acid (dnOPDA) in Arabidopsis thaliana. The biosynthetic pathways of free (dn)OPDA is well described, but it is unclear how they are incorporated into galactolipids. We herein show that (dn)OPDA containing lipids are formed rapidly after disruption of cellular integrity in leaf tissue. Five minutes after freeze-thawing, 60-70% of the trienoic acids esterified to chloroplast galactolipids are converted to (dn)OPDA. Stable isotope labeling with (18)O-water provides strong evidence for that the fatty acids remain attached to galactolipids during the enzymatic conversion to (dn)OPDA.
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Affiliation(s)
- Anders K Nilsson
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, SE-405 30 Gothenburg, Sweden
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Björk RG, Ernfors M, Sikström U, Nilsson MB, Andersson MX, Rütting T, Klemedtsson L. Contrasting effects of wood ash application on microbial community structure, biomass and processes in drained forested peatlands. FEMS Microbiol Ecol 2010; 73:550-62. [PMID: 20550578 DOI: 10.1111/j.1574-6941.2010.00911.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
The effects of wood ash application on soil microbial processes were investigated in three drained forested peatlands, which differed in nutrient status and time since application. Measured variables included the concentrations of soil elements and phospholipid fatty acids (PLFAs), net nitrogen (N) mineralization, nitrification and denitrification enzyme activity, potential methane (CH(4)) oxidation, CH(4) production and microbial respiration kinetics. Wood ash application had a considerable influence on soil element concentrations. This mirrored a decrease in the majority of the microbial biomarkers by more than one-third in the two oligotrophic peatlands, although the microbial community composition was not altered. The decreases in PLFAs coincided with reduced net ammonification and net N mineralization. Other measured variables did not change systematically as a result of wood ash application. No significant changes in microbial biomass or processes were found in the mesotrophic peatland, possibly because too little time (1 year) had elapsed since the wood ash application. This study suggests that oligotrophic peatlands can be substantially affected by wood ash for a period of at least 4 years after application. However, within 25 years of the wood ash application, the microbial biomass seemed to have recovered or adapted to enhanced element concentrations in the soil.
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Affiliation(s)
- Robert G Björk
- School of Science and Technology, Orebro University, Orebro, Sweden.
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Li-Beisson Y, Shorrosh B, Beisson F, Andersson MX, Arondel V, Bates PD, Baud S, Bird D, DeBono A, Durrett TP, Franke RB, Graham IA, Katayama K, Kelly AA, Larson T, Markham JE, Miquel M, Molina I, Nishida I, Rowland O, Samuels L, Schmid KM, Wada H, Welti R, Xu C, Zallot R, Ohlrogge J. Acyl-lipid metabolism. Arabidopsis Book 2010; 8:e0133. [PMID: 22303259 PMCID: PMC3244904 DOI: 10.1199/tab.0133] [Citation(s) in RCA: 232] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Acyl lipids in Arabidopsis and all other plants have a myriad of diverse functions. These include providing the core diffusion barrier of the membranes that separates cells and subcellular organelles. This function alone involves more than 10 membrane lipid classes, including the phospholipids, galactolipids, and sphingolipids, and within each class the variations in acyl chain composition expand the number of structures to several hundred possible molecular species. Acyl lipids in the form of triacylglycerol account for 35% of the weight of Arabidopsis seeds and represent their major form of carbon and energy storage. A layer of cutin and cuticular waxes that restricts the loss of water and provides protection from invasions by pathogens and other stresses covers the entire aerial surface of Arabidopsis. Similar functions are provided by suberin and its associated waxes that are localized in roots, seed coats, and abscission zones and are produced in response to wounding. This chapter focuses on the metabolic pathways that are associated with the biosynthesis and degradation of the acyl lipids mentioned above. These pathways, enzymes, and genes are also presented in detail in an associated website (ARALIP: http://aralip.plantbiology.msu.edu/). Protocols and methods used for analysis of Arabidopsis lipids are provided. Finally, a detailed summary of the composition of Arabidopsis lipids is provided in three figures and 15 tables.
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Tjellström H, Andersson MX, Larsson KE, Sandelius AS. Membrane phospholipids as a phosphate reserve: the dynamic nature of phospholipid-to-digalactosyl diacylglycerol exchange in higher plants. Plant Cell Environ 2008; 31:1388-98. [PMID: 18643953 DOI: 10.1111/j.1365-3040.2008.01851.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
It is well established that phosphate deficiency induces the replacement of membrane phospholipid with non-phosphorous lipids in extra-plastidial membranes (e.g. plasma membrane, tonoplast, mitochondria). The predominant replacement lipid is digalactosyl diacylglycerol (DGDG). This paper reports that the phospholipid-to-DGDG replacement is reversible, and that when oat seedlings are re-supplied with radio-labelled phosphate, it is initially recovered primarily in phosphatidylcholine (PC). Within 2 d, the shoot contains more than half of the lipid-associated radiolabel, reflecting phosphate translocation. Oat was also cultivated in different concentrations of phosphate and the DGDG/PC ratio in roots and phospholipase activities in isolated plasma membranes was assayed after different times of cultivation. The DGDG/PC ratio in root tissue correlated more closely with plasma membrane-localized phospholipase D, yielding phosphatidic acid (PA), than with plasma membrane-localized PA phosphatase, the activity that results in a decreased proportion of phospolipids. The lipid degradation data did not reflect a significant involvement of phospholipase C, although a putative phospholipase C analogue, non-specific phospholipase C4 (NPC4), was present in oat roots. The correlation between increased phospholipase D activity and DGDG/PC ratio is consistent with a model where phospholipid-to-DGDG replacement involves formation of PA that readily is removed from the plasma membrane for further degradation elsewhere.
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Affiliation(s)
- Henrik Tjellström
- Department of Plant and Environmental Sciences, University of Gothenburg, Goteborg, Sweden
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Zhang Z, Lenk A, Andersson MX, Gjetting T, Pedersen C, Nielsen ME, Newman MA, Hou BH, Somerville SC, Thordal-Christensen H. A lesion-mimic syntaxin double mutant in Arabidopsis reveals novel complexity of pathogen defense signaling. Mol Plant 2008; 1:510-27. [PMID: 19825557 DOI: 10.1093/mp/ssn011] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The lesion-mimic Arabidopsis mutant, syp121 syp122, constitutively expresses the salicylic acid (SA) signaling pathway and has low penetration resistance to powdery mildew fungi. Genetic analyses of the lesion-mimic phenotype have expanded our understanding of programmed cell death (PCD) in plants. Inactivation of SA signaling genes in syp121 syp122 only partially rescues the lesion-mimic phenotype, indicating that additional defenses contribute to the PCD. Whole genome transcriptome analysis confirmed that SA-induced transcripts, as well as numerous other known pathogen-response transcripts, are up-regulated after inactivation of the syntaxin genes. A suppressor mutant analysis of syp121 syp122 revealed that FMO1, ALD1, and PAD4 are important for lesion development. Mutant alleles of EDS1, NDR1, RAR1, and SGT1b also partially rescued the lesion-mimic phenotype, suggesting that mutating syntaxin genes stimulates TIR-NB-LRR and CC-NB-LRR-type resistances. The syntaxin double knockout potentiated a powdery mildew-induced HR-like response. This required functional PAD4 but not functional SA signaling. However, SA signaling potentiated the PAD4-dependent HR-like response. Analyses of quadruple mutants suggest that EDS5 and SID2 confer separate SA-independent signaling functions, and that FMO1 and ALD1 mediate SA-independent signals that are NPR1-dependent. These studies highlight the contribution of multiple pathways to defense and point to the complexity of their interactions.
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Affiliation(s)
- Ziguo Zhang
- Plant and Soil Science, Dept of Agricultural Sciences, Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark
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Kourtchenko O, Andersson MX, Hamberg M, Brunnström A, Göbel C, McPhail KL, Gerwick WH, Feussner I, Ellerström M. Oxo-phytodienoic acid-containing galactolipids in Arabidopsis: jasmonate signaling dependence. Plant Physiol 2007; 145:1658-69. [PMID: 17951463 PMCID: PMC2151682 DOI: 10.1104/pp.107.104752] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2007] [Accepted: 10/09/2007] [Indexed: 05/17/2023]
Abstract
The jasmonate family of phytohormones, as represented by 12-oxo-phytodienoic acid (OPDA), dinor-phytodienoic acid (dn-OPDA), and jasmonic acid in Arabidopsis (Arabidopsis thaliana), has been implicated in a vast array of different developmental processes and stress responses. Recent reports indicate that OPDA and dn-OPDA occur not only as free acids in Arabidopsis, but also as esters with complex lipids, so-called arabidopsides. Recently, we showed that recognition of the two bacterial effector proteins AvrRpm1 and AvrRpt2 induced high levels of a molecule consisting of two OPDAs and one dn-OPDA esterified to a monogalactosyl diacylglycerol moiety, named arabidopside E. In this study, we demonstrate that the synthesis of arabidopsides is mainly independent of the prokaryotic lipid biosynthesis pathway in the chloroplast, and, in addition to what previously has been reported, arabidopside E as well as an all-OPDA analog, arabidopside G, described here accumulated during the hypersensitive response and in response to wounding. We also show that different signaling pathways lead to the formation of arabidopsides during the hypersensitive response and the wounding response, respectively. However, the formation of arabidopsides during both responses is dependent on an intact jasmonate signaling pathway. Additionally, we report inhibition of growth of the fungal necrotrophic pathogen Botrytis cinerea and in planta release of free jasmonates in a time frame that overlaps with the observed reduction of arabidopside levels. Thus, arabidopsides may have a dual function: as antipathogenic substances and as storage compounds that allow the slow release of free jasmonates.
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Affiliation(s)
- Olga Kourtchenko
- Department of Plant and Environmental Sciences, Göteborg University, SE-405 30 Gothenburg, Sweden
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Sandelius AS, Andersson MX, Goksör M, Tjellström H, Wellander R. Membrane contact sites: physical attachment between chloroplasts and endoplasmic reticulum revealed by optical manipulation. Chem Phys Lipids 2007. [DOI: 10.1016/j.chemphyslip.2007.06.096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Andersson MX, Goksör M, Sandelius AS. Membrane contact sites: physical attachment between chloroplasts and endoplasmic reticulum revealed by optical manipulation. Plant Signal Behav 2007; 2:185-7. [PMID: 19704692 PMCID: PMC2634053 DOI: 10.4161/psb.2.3.3973] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2007] [Accepted: 02/06/2007] [Indexed: 05/20/2023]
Abstract
Chloroplasts and their surrounding cell are highly interdependent. One example is lipid metabolism, where the cell depends on its chloroplasts to provide fatty acids for lipid synthesis in the endoplasmic reticulum (ER) and in turn, chloroplasts rely on import of lipid precursors from the ER. Despite its fundamental importance, the route for lipid trafficking into and out of chloroplasts remains unknown. Biochemical studies of plant membrane lipid metabolism have suggested the possibility of lipid transport at membrane contact sites (MCSs) between the ER and chloroplasts. With the aid of optical manipulation, we recently could present physical evidence for this association. Leaf protoplasts isolated from Arabidopsis thaliana expressing green fluorescent protein (GFP) in the ER lumen were observed by confocal microscopy. A laser scalpel was used to rupture the protoplasts. ER fragments associated with the released chloroplasts could be stretched out by optical tweezers but remained attached to the chloroplast surface, even when a stretching force of 400 pN was applied. We thus provided the first physical evidence for MCSs between two membranes and we propose for the ER-chloroplast pair, that such tight associations are involved in bidirectional lipid trafficking between the two compartments.
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Affiliation(s)
- Mats X Andersson
- Department of Plant and Environmental Sciences Göteborg University; Göteborg, Sweden
| | - Mattias Goksör
- Department of Physics; Göteborg University; Göteborg, Sweden
| | - Anna Stina Sandelius
- Department of Plant and Environmental Sciences Göteborg University; Göteborg, Sweden
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Andersson MX, Goksör M, Sandelius AS. Optical manipulation reveals strong attracting forces at membrane contact sites between endoplasmic reticulum and chloroplasts. J Biol Chem 2007; 282:1170-4. [PMID: 17077082 DOI: 10.1074/jbc.m608124200] [Citation(s) in RCA: 154] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Eukaryote cells depend on membrane lipid trafficking from biogenic membranes, like the endoplasmic reticulum (ER), to other membranes in the cell. Two major routes for membrane lipid transport are recognized: vesicular trafficking and lipid transfer at zones of close contact between membranes. Specific ER regions involved in such membrane contact sites (MCSs) have been isolated, and lipid transfer at MCSs as well as protein-protein interactions between the partaking membranes have been demonstrated (reviewed by Holthuis, J. C. M., and Levine, T. P. (2005) Nat. Rev. 6, 209-220). Here we present the first demonstration of the physical association between membranes involved in MCSs: by using optical imaging and manipulation, strong attracting forces between ER and chloroplasts are revealed. We used Arabidopsis thaliana expressing green fluorescent protein in the ER lumen and observed leaf protoplasts by confocal microscopy. The ER network was evident, with ER branch end points apparently localized at chloroplast surfaces. After rupture of a protoplast using a laser scalpel, the cell content was released. ER fragments remained attached to the released chloroplasts and could be stretched out by optical tweezers. The applied force, 400 pN, could not drag a chloroplast free from its attached ER, which could reflect protein-protein interactions at the ER-chloroplast MCSs. As chloroplasts rely on import of ER-synthesized lipids, we propose that lipid transfer occurs at these MCSs. We suggest that lipid transfer at the MCSs also occurs in the opposite direction, for example to channel plastid-synthesized acyl groups to supply substrates for ER-localized synthesis of membrane and storage lipids.
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Affiliation(s)
- Mats X Andersson
- Department of Plant and Environmental Sciences, Göteborg University, Sweden
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