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  • Neuronal plasticity as an evolutionary strategy: Implications for neuroprotection in response to hypoxic challenge.

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    Author(s)
    Renshaw, Gillian
    Griffith University Author(s)
    Renshaw, Gillian M.
    Year published
    2007
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    Abstract
    Phenotypic plasticity has an important place in evolution because in order to survive in a dynamically changing environment, an organism needs to have a well-adapted set of defense responses, which include pre-emptive and retaliatory phenotypic shifts. From previous research it seems that while only a few vertebrates can survive prolonged periods of hypoxia or anoxia, the greatest physiological challenge occurs when severely diminished oxygen levels are encountered at tropical temperatures. Until recently, all of the neuroprotective strategies examined have been in hypoxia and anoxia tolerant species that evolved their ...
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    Phenotypic plasticity has an important place in evolution because in order to survive in a dynamically changing environment, an organism needs to have a well-adapted set of defense responses, which include pre-emptive and retaliatory phenotypic shifts. From previous research it seems that while only a few vertebrates can survive prolonged periods of hypoxia or anoxia, the greatest physiological challenge occurs when severely diminished oxygen levels are encountered at tropical temperatures. Until recently, all of the neuroprotective strategies examined have been in hypoxia and anoxia tolerant species that evolved their tolerance at temperatures close to freezing. The discovery of a hypoxia and anoxia tolerant reef shark, the epaulette shark (Hemiscyllium ocellatum), has provided a model in which to examine neuroprotective mechanisms that evolved at tropical temperatures. The most susceptible tissues are the heart and brain because their continued metabolic activity rapidly depletes the energy budget. Successfully hypoxia and anoxia tolerant species of fish and turtles have evolved a set of strategies to forestall cell death. These physiological strategies centre on reversibly reprogramming metabolism by reducing energy consumption and increasing glycolysis. This review will focus on the activation of retaliatory and pre-emptive neuroprotective mechanisms that are elicited in the hypoxia and anoxia tolerant tropical epaulette shark to shut down cerebella activity and conserve brain energy charge during an anoxic challenge and will examine changes in the level of the inhibitory neurotransmitter gamma-aminobutyric acid, gamma-aminobutyric acid receptors, the role adenosine and molecular chaperones in forestalling neuronal death.
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    Book Title
    Evolutionary Molecular Strategies and Plasticity
    Publisher URI
    http://www.ressign.com/UserArticleDetails.aspx?arid=5233
    Copyright Statement
    © 2007 Research Signpost. The attached fine is reproduced here in accordance with the copyright policy of the publisher. Please refer to the publisher's website for further information.
    Publication URI
    http://hdl.handle.net/10072/19307
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