Effects of cold shock and cortisol on heat shock protein levels in rainbow trout

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  • NAKANO IOSHIKI
    Graduate School of Agricultural Science, Tohoku University Faculty of Agricultural Sciences, The University of British Columbia and AquaNet/NCE
  • BASU NIL
    Faculty of Agricultural Sciences, The University of British Columbia and AquaNet/NCE
  • YAMAGUCHI TOSHIYASU
    Graduate School of Agricultural Science, Tohoku University
  • SATO MINORU
    Graduate School of Agricultural Science, Tohoku University
  • NAKANO KAZUMI
    Faculty of Agricultural Sciences, The University of British Columbia and AquaNet/NCE
  • HICKS JASON M. T.
    Faculty of Agricultural Sciences, The University of British Columbia and AquaNet/NCE
  • IWAMA GEORGE K.
    Faculty of Agricultural Sciences, The University of British Columbia and AquaNet/NCE Institute for Marine Biosciences, NRC

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Abstract

The effect of cold shock and increased levels of circulating cortisol on heat shock proteins (Hsp) levels in rainbow trout (Oncorhynchus mykiss) were examined. Cold shock: When the cultured hepatocytes were exposed to cold (at 4°C for 2h), Hsp 70 level in hepatocytes were similar to that in control. However, Hsp 30 was markedly induced by cold shock. Cortisol: The high concentration of circulating cortisol (pharmacological levels) was found to reduce the Hsp 70 levels in liver and gill of cortisol implanted fish (50 μg cortisol/g body weight) exposed to heat shock (at 22°C for 2h) compared to the sham. These results suggest that the expressions of Hsp 30 and 70 in cell may be affected by cold stress response and circulating cortisol levels in fish, respectively. Furthermore, cellular stress response, such as Hsp expression, might be related with neuroendocrine/endocrine system in fish.

Journal

  • Fisheries science

    Fisheries science 68 (sup2), 1037-1040, 2002

    The Japanese Society of Fisheries Science

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