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Related Concept Videos

Neural Regulation01:37

Neural Regulation

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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.
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Physiology of Enteric Nervous System and Gut Health01:05

Physiology of Enteric Nervous System and Gut Health

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The gastrointestinal tract, responsible for the digestion and absorption of nutrients, is safeguarded by the intestinal barrier, which consists of secretory, physical, and immune components. At the forefront is the secretory barrier, composed of essential elements such as mucus, gut microbiota, and defense proteins. They collaborate to break down food particles, facilitate nutrient absorption, and maintain optimal gut health. These secretory components ensure the smooth functioning of the...
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Enteric Nervous System: Regulation of GI Motor Activity01:11

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The Enteric Nervous System (ENS) plays a pivotal role in regulating gastrointestinal or GI motor activity. This complex network of nerves, deeply embedded within the gut wall, responds to changes in the gut environment and receives input from both the autonomic nervous system and the central nervous system. By doing so, the ENS operates various programs tailored to the body's nutritional status and needs.
During periods of fasting, the ENS initiates the migrating myoelectric complex, a...
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Nerve Supply of the GI Tract01:27

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The neuronal supply to the gastrointestinal (GI) tract is essential for regulating various functions, including digestion, absorption, and movement of food. This intricate network of nerves is known as the enteric nervous system (ENS), often referred to as the "second brain" of the body.
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Physiology of the Gastrointestinal System III: Elimination01:26

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The gastrointestinal elimination process involves a complex interplay of neural and hormonal mechanisms that coordinate the final waste removal from the body. This intricate operation encompasses the absorption of water and electrolytes, vital for transforming the remaining indigestible food matter into feces. The large intestine is pivotal in water and electrolyte absorption, forming feces from unabsorbed minerals, undigested food, bacteria, bile pigments, and shed epithelial cells. Essential...
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Hormonal Regulation01:40

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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.
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Related Experiment Video

Updated: Sep 27, 2025

Real-time Analysis of Gut-brain Neural Communication: Cortex wide Calcium Dynamics in Response to Intestinal Glucose Stimulation
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How the gut talks to the brain.

Antoine Adamantidis1,2

  • 1Zentrum für Experimentelle Neurologie, Department of Neurology, Inselspital University Hospital Bern, Bern, Switzerland.

Science (New York, N.Y.)
|April 14, 2022
PubMed
Summary

Gut bacteria peptidoglycans influence appetite by acting on brain circuits. This research reveals a novel gut-brain axis mechanism controlling feeding behavior.

Area of Science:

  • Microbiology
  • Neuroscience
  • Metabolism

Background:

  • Gut microbiota produce various molecules that can influence host physiology.
  • The gut-brain axis plays a critical role in regulating energy homeostasis.
  • Appetite regulation involves complex neural circuits in the hypothalamus.

Purpose of the Study:

  • To investigate the role of gut microbiota-derived peptidoglycans in appetite control.
  • To identify the specific hypothalamic circuits targeted by peptidoglycans.
  • To elucidate the molecular mechanisms underlying peptidoglycan-mediated appetite modulation.

Main Methods:

  • Analysis of peptidoglycan composition from fecal samples.
  • In vivo studies using mouse models with targeted genetic modifications.

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  • Electrophysiological recordings and calcium imaging in hypothalamic neurons.
  • Behavioral assays to measure food intake and satiety.

    • Main Results:

    • Specific peptidoglycans from gut bacteria were found to significantly alter appetite.
    • Administration of these peptidoglycans modulated neuronal activity in key hypothalamic nuclei.
    • Peptidoglycans were shown to influence appetite-regulating neuropeptide signaling.
    • Targeted interventions altered feeding behavior in experimental models.

    Conclusions:

    • Gut microbiota peptidoglycans are key mediators of appetite regulation.
    • The hypothalamus is a critical target for microbial metabolites in controlling feeding.
    • These findings highlight a novel pathway in the gut-brain axis for metabolic health.