Anorexigenic neurons

Definition

Anorexigenic neurons are a type of nerve cell that primarily function to suppress appetite and promote feelings of fullness. These neurons play a critical role in the neural and hormonal regulation of energy balance by releasing neuropeptides that inhibit feeding behavior, ultimately contributing to the maintenance of body weight and energy homeostasis.

5 Must Know Facts For Your Next Test

1. Anorexigenic neurons are primarily located in the arcuate nucleus of the hypothalamus and are crucial for controlling food intake.
2. These neurons release neuropeptides such as pro-opiomelanocortin (POMC) and cocaine-and-amphetamine-regulated transcript (CART), which signal satiety to reduce appetite.
3. The activation of anorexigenic neurons can be influenced by various hormones, including leptin and insulin, which inform the brain about the body's energy status.
4. An imbalance between anorexigenic and orexigenic neuron activity can lead to eating disorders, obesity, or undernutrition by disrupting normal appetite regulation.
5. Research has shown that stimulating anorexigenic pathways can potentially be a therapeutic target for managing obesity and related metabolic disorders.

Review Questions

• How do anorexigenic neurons interact with orexigenic neurons in regulating appetite?
  • Anorexigenic neurons function to suppress appetite, while orexigenic neurons stimulate hunger. These two types of neurons create a balance in appetite regulation. When anorexigenic neurons are activated, they inhibit the activity of orexigenic neurons, leading to decreased food intake. Conversely, when orexigenic neurons are activated due to energy deficit signals, they can dampen the activity of anorexigenic neurons, promoting feeding behavior.
• Discuss the role of hormones like leptin in modulating the activity of anorexigenic neurons.
  • Leptin is a hormone released by adipose tissue that plays a significant role in regulating energy balance. It acts on anorexigenic neurons in the hypothalamus, enhancing their activity to promote feelings of satiety. When fat stores increase, leptin levels rise, stimulating these neurons to inhibit appetite. Conversely, low leptin levels result in reduced stimulation of anorexigenic neurons, leading to increased hunger and food intake.
• Evaluate the potential implications of targeting anorexigenic neuronal pathways for obesity treatment strategies.
  • Targeting anorexigenic neuronal pathways could provide innovative strategies for obesity management by enhancing satiety signals and reducing excessive food intake. Therapies designed to stimulate these pathways may improve energy balance and assist in weight loss. However, it’s crucial to consider the complex interactions between various neuronal circuits, hormonal signals, and individual differences in metabolism to ensure that such treatments are effective without causing adverse effects like malnutrition or eating disorders.

Related terms

orexigenic neurons: These neurons stimulate appetite and encourage food intake by releasing neuropeptides that promote hunger.

hypothalamus: A brain region that regulates various bodily functions, including hunger and satiety, by integrating signals from anorexigenic and orexigenic neurons.

neuropeptides: Small protein-like molecules used by neurons to communicate with each other, influencing processes such as appetite and metabolism.