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06:58
High-Throughput Assays of Critical Thermal Limits in Insects
Published on: June 15, 2020
Linking membrane physical properties and low temperature tolerance in arthropods
Dorthe Waagner1, Hélène Bouvrais, John H Ipsen
1Aarhus University, Department of Bioscience, Vejlsøvej 25, DK-8600 Silkeborg, Denmark.
Cryobiology
|October 2, 2013
Summary
This study directly links membrane physical properties to cold tolerance in ectotherms. Decreasing membrane rigidity with ethanol enhanced cold shock tolerance in springtails, revealing a direct relationship.
Area of Science:
- Environmental Physiology
- Biophysics
Background:
- Ectotherms rely on membrane fluidity for thermal adaptation.
- Previous studies used indirect biochemical measures to assess membrane changes.
Purpose of the Study:
- To directly measure membrane physical characteristics and link them to low-temperature tolerance.
- To investigate the role of membrane bending rigidity in cold adaptation.
Main Methods:
- Measured bending rigidity of re-constituted lipid bilayers from Folsomia candida.
- Utilized Giant Unilamellar Vesicles (GUVs) for in vitro analysis.
- Assessed cold shock tolerance after chemical induction of altered membrane rigidity.
Main Results:
- Ethanol exposure (0.4 vol%) decreased membrane bending rigidity.
- Springtails exposed to ethanol showed significantly increased cold shock tolerance.
- Demonstrated a direct correlation between reduced membrane rigidity and enhanced cold tolerance.
Conclusions:
- Chemically induced changes in membrane rigidity directly impact low-temperature tolerance.
- Bending rigidity is a key physical characteristic linking membrane properties to chill susceptibility.
- Provides a direct biophysical link for understanding ectotherm cold adaptation.
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