[14C]2-deoxyglucose uptake in ground squirrel brain during hibernation

Area of Science:

• Neuroscience
• Physiology
• Metabolic Research

Background:

• Hibernation involves profound physiological changes, including altered brain activity.
• Understanding brain energy metabolism during hibernation is key to explaining survival strategies.

Purpose of the Study:

• To map brain glucose metabolism using [14C]2-deoxyglucose uptake in hibernating and euthermic ground squirrels.
• To identify brain regions with altered metabolic activity critical for hibernation.

Main Methods:

• Autoradiography was used to visualize [14C]2-deoxyglucose uptake patterns in ground squirrel brains.
• Relative 2-deoxyglucose uptake (R2DGU) was quantified across 85 neural structures in both hibernating and euthermic states.

Main Results:

• Brain metabolism became more homogeneous during hibernation, with decreased gray to white matter R2DGU in most structures.
• The cochlear nucleus, paratrigeminal nucleus, and superior colliculus showed the highest R2DGU during hibernation.
• The suprachiasmatic nucleus and lateral septal nucleus exhibited the least reduction in R2DGU from euthermia to hibernation.

Conclusions:

• Specific brain nuclei, particularly sensory and regulatory centers, maintain high metabolic activity during hibernation.
• These metabolically active regions may be vital for processing environmental stimuli and regulating hibernation.