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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
In vivo speciation studies and antioxidant properties of bromine in Laminaria digitata reinforce the significance of iodine accumulation for kelps
Journal of Experimental Botany, Volume 64, No. 10, Year 2013
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Description
The metabolism of bromine in marine brown algae remains poorly understood. This contrasts with the recent finding that the accumulation of iodide in the brown alga Laminaria serves the provision of an inorganic antioxidant - the first case documented from a living system. The aim of this study was to use an interdisciplinary array of techniques to study the chemical speciation, transformation, and function of bromine in Laminaria and to investigate the link between bromine and iodine metabolism, in particular in the antioxidant context. First, bromine and iodine levels in different Laminaria tissues were compared by inductively coupled plasma MS. Using in vivo X-ray absorption spectroscopy, it was found that, similarly to iodine, bromine is predominantly present in this alga in the form of bromide, albeit at lower concentrations, and that it shows similar behaviour upon oxidative stress. However, from a thermodynamic and kinetic standpoint, supported by in vitro and reconstituted in vivo assays, bromide is less suitable than iodide as an antioxidant against most reactive oxygen species except superoxide, possibly explaining why kelps prefer to accumulate iodide. This constitutes the first-ever study exploring the potential antioxidant function of bromide in a living system and other potential physiological roles. Given the tissue-specific differences observed in the content and speciation of bromine, it is concluded that the bromide uptake mechanism is different from the vanadium iodoperoxidase-mediated uptake of iodide in L. digitata and that its function is likely to be complementary to the iodide antioxidant system for detoxifying superoxide. © The Author(2) [2013].
Authors & Co-Authors
Küpper, Frithjof Christian
United Kingdom, Aberdeen
University of Aberdeen
United Kingdom, Oban
The Scottish Association for Marine Science
Carpenter, Lucy J.
United Kingdom, York
University of York
Leblanc, Catherine
France, Roscoff
Laboratoire de Biologie Intégrative Des Modèles Marins
Luther, George W.III I.
United States, Newark
University of Delaware
Kroneck, Peter M.H.
Germany, Konstanz
Universität Konstanz
Kloareg, Bernard
France, Roscoff
Laboratoire de Biologie Intégrative Des Modèles Marins
Meyer-Klaucke, Wolfram
Germany, Hamburg
Deutsches Elektronen-synchrotron Desy
Muramatsu, Yasuyuki
Japan, Tokyo
Gakushuin University
Potin, Philippe
France, Roscoff
Laboratoire de Biologie Intégrative Des Modèles Marins
Feiters, Martin C.
Netherlands, Nijmegen
Radboud Universiteit
Statistics
Citations: 43
Authors: 10
Affiliations: 12
Identifiers
Doi:
10.1093/jxb/ert110
ISSN:
14602431