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Evidence for two states of thermotolerance
Summary
Thermotolerance in Lymnaea stagnalis larvae is induced by heat pretreatment, with stability depending on conditioning temperature and duration. Heat-shock protein synthesis is linked to stable thermotolerance.
Area of Science:
- Zoology
- Molecular Biology
- Environmental Physiology
Background:
- Thermotolerance is a crucial survival mechanism in many organisms.
- Understanding thermotolerance in invertebrates like Lymnaea stagnalis provides insights into cellular stress responses.
Purpose of the Study:
- To investigate the characteristics of thermotolerance induction and decay in Lymnaea stagnalis larvae.
- To explore the role of heat-shock proteins (hsp) in thermotolerance.
Main Methods:
- Larvae of Lymnaea stagnalis were subjected to various conditioning treatments (CT) at different temperatures and durations.
- Protein synthesis inhibition was studied using puromycin.
- Heat-shock protein synthesis was analyzed via gel electrophoresis after [35S]methionine incubation.
Main Results:
- Thermotolerance was induced by CTs above 33°C, with stability varying based on CT parameters.
- Thermotolerance induced by higher temperatures (>38°C) was more stable than that induced by lower temperatures.
- Heat-shock proteins were synthesized at temperatures ≥35°C, and puromycin partially inhibited thermotolerance induction while slowing its decay.
Conclusions:
- Lymnaea stagnalis thermotolerance appears to involve at least two states: an unstable, potentially hsp-independent state, and a stable, hsp-associated state.
- Heat-shock protein synthesis plays a role in the more stable form of thermotolerance.