Summary
The role of heat-shock protein synthesis in the development of thermotolerance by rainbow trout fibroblasts was examined. During the first 6 h after being shifted from 22°C to 28°C, cells of the rainbow trout fibroblast line, RTG-2, rapidly synthesized the major heat-shock proteins (hsps), hsps 87, 70 and 27, and developed tolerance to 32°C. After 24 h at 28°C hsp synthesis was drastically reduced but thermotolerance was maintained. If these thermotolerant cells were shifted to 32°C, hsp synthesis continued at a very low level, but if they were subsequently returned to 22°C, synthesis of hsps 70 and 27 was induced again. The addition of actinomycin D during the first 6 h at 28°C prevented hsp synthesis and the development of thermotolerance. The presence of actinomycin D during the incubation of thermotolerant cultures at 32°C blocked the reinitiation of hsps synthesis at 22°C but had no effect on survival. Therefore, the hsps that accumulated at 28°C were sufficient to allow cells to survive a subsequent thermal stress at 32°C.
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Mosser, D.D., Bols, N.C. Relationship between heat-shock protein synthesis and thermotolerance in rainbow trout fibroblasts. J Comp Physiol B 158, 457–467 (1988). https://doi.org/10.1007/BF00691143
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DOI: https://doi.org/10.1007/BF00691143