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Thermotolerance induced by heat and ethanol
E K Boon-Niermeijer1, J E Souren, A M De Waal
1Department of Experimental Zoology, State University of Utrecht, The Netherlands.
Summary
Mild ethanol or heat exposure rapidly induces thermotolerance in Lymnaea stagnalis larvae without increasing heat shock proteins (HSPs). Higher doses trigger HSP synthesis for a more sustained protective state.
Area of Science:
- * Molecular biology
- * Environmental toxicology
- * Developmental biology
Background:
- * Freshwater snails (Lymnaea stagnalis) are sensitive to environmental stressors.
- * Thermotolerance is a crucial survival mechanism.
- * Heat shock proteins (HSPs) are involved in cellular stress responses.
Purpose of the Study:
- * To investigate the effects of ethanol and heat on snail larval thermosensitivity.
- * To analyze the kinetics of thermotolerance development and decay.
- * To understand the role of protein synthesis and HSPs in stress response.
Main Methods:
- * Exposure of 3-day-old Lymnaea stagnalis larvae to ethanol and heat.
- * Assessment of thermotolerance development and decay.
- * Analysis of protein synthesis patterns and HSP expression (HSP 65, HSP 70, HSP 87).
Main Results:
- * Mild stress induced rapid, transient thermotolerance without increased HSP synthesis.
- * Higher stress levels induced thermotolerance alongside enhanced synthesis of HSP 65, HSP 70, and HSP 87.
- * HSP synthesis was elevated only when overall protein synthesis was suppressed.
- * Constitutive HSP levels appear to offer immediate heat protection.
Conclusions:
- * Two distinct thermotolerance states exist: rapid, HSP-independent, and sustained, HSP-dependent.
- * Induced HSP synthesis is crucial for extending the thermotolerant state.
- * Environmental stressors like ethanol can modulate cellular stress responses in aquatic organisms.