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Title
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Recovery of the energy metabolism after a hypoxic challenge at different temperature conditions : a ^{31}P nuclear magnetic resonance spectroscopy study with common carp
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Author
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Abstract
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| We determined the effects of a mild hypoxic challenge on the energy metabolism of the common carp, Cyprinus carpio, under different temperature conditions, by P-31-nuclear magnetic resonance spectroscopy (P-31-NMR). Fish were acclimated to the optimal temperature of 25 degrees C or the acute sublethal temperature of 33 degrees C. A group of the 25 degrees C acclimated fish was also exposed to a temperature shock of 33 degrees C. The resting levels of phosphocreatine (PCr) and inorganic phosphate (P-i) were comparable between the three groups. The level of ATP remained unchanged under all experimental conditions. Submission to a short hypoxic challenge resulted in acidosis and a depletion of PCr, while Pi increased. The recovery of the PCr levels after hypoxia was independent of the temperature to which the fish were acclimated, but when submitted to an acute temperature shock, the recovery was much slower. Resting intracellular pH (pH(i)) decreased under increasing temperature and the recovery of pH, was independent of the temperature condition. The extent of acidosis under the hypoxic challenge was more severe in carp exposed to both the acute and the chronic sublethal temperature stress. This study revealed that shortly after exposure to a sublethal acute temperature stress, significant differences in the capacity to recover from an hypoxic challenge had occurred. After a period of 4 weeks exposure to a sustained sublethal high temperature, carp regain the capacity to recover fully from the hypoxia, indicating that acclimation had occurred. (C) 1998 Elsevier Science Inc. All rights reserved. |
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Language
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English
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Source (journal)
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Comparative biochemistry and physiology : A : molecular & integrative physiology. - London
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Publication
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London
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1998
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ISSN
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1095-6433
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DOI
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10.1016/S1095-6433(98)10022-3
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Volume/pages
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120
:1
(1998)
, p. 143-150
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ISI
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000075437300022
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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