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Related Experiment Videos

The selfish brain: competition for energy resources.

H L Fehm1, W Kern, A Peters

  • 1Medizinische Klinik I, Universität Lübeck, Ratzeburger Allee 160, D-23538 Lübeck, Germany. fehm@uni-luebeck.de

Progress in Brain Research
|August 1, 2006
PubMed
Summary

The brain prioritizes its glucose needs, even at the expense of body weight, through a "selfish brain" mechanism involving stress and appetite signals. Disruptions in this energy allocation can lead to obesity and metabolic syndrome.

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Area of Science:

  • Neuroscience
  • Metabolic Regulation
  • Endocrinology

Background:

  • The brain, despite being 2% of body mass, consumes 50% of glucose, its primary energy source.
  • Maintaining brain glucose supply is challenging due to competition from peripheral tissues and limited circulating energy stores.
  • Brain glucose regulation involves 'energy on demand' and 'energy on request' signals influencing nutrient allocation.

Purpose of the Study:

  • To explain how the brain ensures its glucose supply through a "selfish brain" theory.
  • To elucidate the role of neural pathways, including the hypothalamus-pituitary-adrenal (HPA) axis and sympathetic nervous system (SNS), in energy allocation.
  • To explore the implications of disrupted energy allocation for body weight regulation and metabolic disorders.

Main Methods:

Related Experiment Videos

  • Conceptual framework based on neurobiological signaling pathways.
  • Analysis of the interplay between brain glucose sensing, appetite regulation, and peripheral metabolic control.
  • Integration of findings on stress responses, hormonal feedback, and their impact on energy balance.

Main Results:

  • The brain uses "energy on demand" and "energy on request" signals to manage glucose uptake.
  • Activation of the sympathetic nervous system (SNS) and HPA axis by the brain can inhibit peripheral glucose utilization and increase hepatic glucose production.
  • Disruptions in the
  • energy on request
  • signaling, particularly hippocampal set-point displacement, can lead to neuroglucopenia, increased food intake, and weight gain.
  • This self-serving brain mechanism contributes to obesity and metabolic syndrome by prioritizing brain energy needs.

Conclusions:

  • The "selfish brain theory" posits that the brain actively manages its energy supply, potentially at the cost of host body weight.
  • Dysregulation of hippocampal-amygdala input to the paraventricular nucleus (PVN) is implicated in the pathogenesis of obesity and metabolic syndrome.
  • Current therapies for metabolic syndrome may be ineffective long-term as they target compensatory mechanisms rather than the primary disturbance in energy allocation.