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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.
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Gastric motility is the coordinated contraction and relaxation of stomach muscles that convert ingested food into chyme, a semi-liquid substance ready for further digestion in the intestines. The process begins with the vagus nerve inducing the relaxation of the smooth muscles in the fundus and body of the stomach, allowing these regions to expand and accommodate up to approximately 1.5 liters of food and liquid.
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Gastrointestinal or GI motility disorders are characterized by irregular gastrointestinal tract movements, disrupting food transit from the mouth to the anus. They are caused by damage or dysfunction in gut muscles or nerves. These disorders can cause symptoms such as severe constipation, diarrhea, abdominal pain, and swallowing difficulties. Disorders can affect any segment of the GI tract and range widely in severity, from common conditions like GERD to life-threatening conditions like...
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Gastrointestinal Motility Monitor GIMM
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Macrophages regulate gastrointestinal motility through complement component 1q.

Mihir Pendse1, Haley De Selle1, Nguyen Vo1

  • 1Department of Immunology, The University of Texas Southwestern Medical Center, Dallas, United States.

Elife
|May 9, 2023
PubMed
Summary
This summary is machine-generated.

Complement component 1q (C1q), produced by intestinal macrophages, regulates gut motility. Macrophage C1q influences enteric neuron gene expression and accelerates intestinal transit, revealing a novel crosstalk mechanism.

Keywords:
enteric nervous systemgut motilityimmunologyinflammationintestinemacrophagemouse

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Area of Science:

  • Immunology
  • Neuroscience
  • Gastroenterology

Background:

  • Intestinal motility relies on peristalsis, regulated by interactions between macrophages and the enteric nervous system.
  • The molecular mediators of this macrophage-enteric nervous system crosstalk remain incompletely understood.

Purpose of the Study:

  • To identify molecular mediators involved in the crosstalk between intestinal macrophages and the enteric nervous system.
  • To investigate the role of complement component 1q (C1q) produced by macrophages in regulating gastrointestinal motility.

Main Methods:

  • Investigated C1q expression in mouse intestinal tissues.
  • Generated mice with macrophage-specific deletion of C1q (C1qa).
  • Analyzed enteric neuronal gene expression, neurogenic activity, and intestinal transit in these mice.

Main Results:

  • Macrophages are the primary source of C1q in the intestine, distinct from its role in bacterial defense.
  • C1q-expressing macrophages are strategically located near enteric neurons in the intestinal plexuses.
  • Macrophage-specific C1q deletion altered enteric neuron gene expression, increased peristalsis, and accelerated intestinal transit.

Conclusions:

  • Complement component 1q (C1q) is identified as a novel macrophage-derived regulator of gastrointestinal motility.
  • C1q plays a significant role in the crosstalk between intestinal macrophages and the enteric nervous system.
  • These findings enhance understanding of the molecular mechanisms governing gut motility.