Cold acclimation preserves hindgut reabsorption capacity at low temperature in a chill-susceptible insect, Locusta migratoria.

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
Lucie GerberJohannes Overgaard

Abstract

Cold acclimation increases cold tolerance of chill-susceptible insects and the acclimation response often involves improved organismal ion balance and osmoregulatory function at low temperature. However, the physiological mechanisms underlying plasticity of ion regulatory capacity are largely unresolved. Here we used Ussing chambers to explore the effects of cold exposure on hindgut KCl reabsorption in cold- (11 °C) and warm-acclimated (30 °C) Locusta migratoria. Cooling (from 30 to 10 °C) reduced active reabsorption across recta from warm-acclimated locusts, while recta from cold-acclimated locusts maintained reabsorption at 10 °C. The differences in transport capacity were not linked to major rearrangements of membrane phospholipid profiles. Yet, the stimulatory effect of two signal transduction pathways were altered by temperature and/or acclimation. cAMP-stimulation increased reabsorption in both acclimation groups, with a strong stimulatory effect at 30 °C and a moderate stimulatory effect at 10 °C. cGMP-stimulation also increased reabsorption in both acclimation groups at 30 °C, but their response to cGMP differed at 10 °C. Recta from warm-acclimated locusts, characterised by reduced reabsorption at 10 °C, recovered reabs...Continue Reading

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Jun 14, 2020·The Journal of Experimental Biology·Kaylen Brzezinski, Heath A MacMillan

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Citations

Mar 7, 2021·Current Opinion in Insect Science·Johannes OvergaardMads Kuhlmann Andersen
Jul 19, 2021·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Nicholas M Teets, Scott A L Hayward

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