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Neuronal Activity in the Hibernating Brain.

Mandy Sonntag1, Thomas Arendt1

  • 1Paul-Flechsig-Institute of Brain Research, Medical Faculty, University of Leipzig, Leipzig, Germany.

Frontiers in Neuroanatomy
|July 25, 2019
PubMed
Summary
This summary is machine-generated.

Hibernation involves significant body temperature drops, yet the brain maintains neural control. Specific brain regions retain neuronal activity even in deep torpor, crucial for survival during cold conditions.

Keywords:
c-Foselectrophysiologyfiring rate homeostasishibernationhypothermianeuronal activity

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Area of Science:

  • Neuroscience
  • Physiology
  • Zoology

Background:

  • Hibernation is a survival strategy for many species facing extreme cold and food scarcity.
  • It involves regulated drops in body temperature, sometimes near 0°C.
  • Neural control persists throughout hibernation, despite reduced overall brain activity.

Purpose of the Study:

  • To review current knowledge on neuronal activity in the hibernating brain.
  • To focus on cold-induced adaptations in neural function during hibernation.
  • To understand the brain's response to drastic temperature changes.

Main Methods:

  • Review of existing in vitro and in vivo electrophysiological data.
  • Analysis of molecular markers for neuronal activity.
  • Examination of studies on brain sensitivity to temperature changes.

Main Results:

  • Neuronal activity significantly decreases with body temperature during hibernation.
  • Many neurons exhibit infrequent firing in torpor at low brain temperatures.
  • Specific brain regions and the peripheral system retain the ability to generate action potentials in deep torpor.

Conclusions:

  • The hibernating brain adapts to extreme cold, with reduced but maintained neuronal function.
  • Specific neural circuits remain active, supporting essential functions during torpor.
  • Further research is needed to elucidate temperature effects on specific neuronal types and nuclei.