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Related Concept Videos

Regulation of Food Intake01:30

Regulation of Food Intake

Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
Diencephalon: Hypothalamus and Coordination01:23

Diencephalon: Hypothalamus and Coordination

The hypothalamus is a small yet highly complex and essential brain region that plays a crucial role in regulating various bodily functions. Anatomically, it is located at the base of the brain, just above the brainstem and below the thalamus, forming part of the limbic system.
The hypothalamus interacts with other brain regions, including the pituitary gland, through a direct physical connection called the hypothalamic-pituitary axis. The hypothalamus receives somatic and visceral inputs and...
Hormones Regulating Blood Glucose01:16

Hormones Regulating Blood Glucose

Insulin is released by beta cells of the pancreas when blood glucose levels are high. It facilitates glucose absorption and utilization in insulin-dependent cells with insulin receptors on their plasma membranes. Insulin promotes glucose uptake by increasing the number of glucose transport proteins in the cell membrane, allowing glucose to enter the cell. As a result, glucose utilization and ATP production are enhanced.
In addition to accelerating glucose uptake and utilization, insulin has...
Neural Regulation01:37

Neural Regulation

Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.
Hormonal Regulation01:40

Hormonal Regulation

Hormones regulate a significant portion of digestion through activation of the neuroendocrine system. The neuroendocrine system of digestion contains many different hormones all with multiple functions that are both, directly and indirectly, involved in digestion.
Hormones of the Pituitary Gland01:27

Hormones of the Pituitary Gland

The small, pea-sized pituitary gland is located at the base of the brain. It is crucial in regulating various bodily functions, from growth to reproduction. The gland is divided into the anterior lobe and the posterior lobe. The secretory cell clusters in the pars distalis of the anterior pituitary lobe are controlled by hypothalamic regulators and synthesize six primary hormones.
The most abundantly secreted hormone from the anterior lobe is the growth hormone, which controls overall growth by...

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Hypothalamic Kisspeptin Neurons as a Target for Whole-Cell Patch-Clamp Recordings
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Hypothalamic AgRP-neurons control peripheral substrate utilization and nutrient partitioning.

Aurélie Joly-Amado1, Raphaël G P Denis, Julien Castel

  • 1Univ Paris Diderot, Sorbonne Paris Cité, Unité de Biologie Fonctionnelle et Adaptative, Paris, France.

The EMBO Journal
|September 20, 2012
PubMed
Summary
This summary is machine-generated.

Agouti-related protein (AgRP) neurons regulate nutrient partitioning and autonomic output to key metabolic organs. Ablating these neurons impacts obesity and glucose metabolism, linking them to metabolic disease.

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Area of Science:

  • Neuroscience
  • Metabolism
  • Endocrinology

Background:

  • Obesity-related diseases like diabetes stem from metabolic dysregulation.
  • Agouti-related protein (AgRP) neurons are key regulators of feeding behavior and energy balance in the hypothalamus.

Purpose of the Study:

  • To investigate the role of AgRP-producing neurons in controlling nutrient partitioning.
  • To elucidate the mechanisms by which AgRP neurons influence metabolic processes.

Main Methods:

  • Ablation of AgRP-producing neurons in mice.
  • Analysis of autonomic output to liver, muscle, and pancreas.
  • Assessment of metabolic parameters including body weight, glucose tolerance, and insulin levels.

Main Results:

  • Ablation of AgRP neurons altered autonomic output, affecting lipid and carbohydrate metabolism.
  • Mice lacking AgRP neurons became obese and hyperinsulinemic on a standard diet.
  • These mice showed reduced weight gain and improved glucose tolerance on a high-fat diet.

Conclusions:

  • AgRP neurons play a crucial role in coordinating organ activity and nutrient partitioning.
  • These findings establish a mechanistic link between AgRP neuron function, obesity, and related metabolic disorders.