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Related Concept Videos

Formation of Lipopolysaccharides01:19

Formation of Lipopolysaccharides

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Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin,...
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Anatomy of the Intestines01:23

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Although digestion of proteins, carbohydrates, and lipids may begin in the stomach, it is completed in the intestine. The absorption of nutrients, water, and electrolytes from food and drink also occurs in the intestine. The intestines can be divided into two structurally distinct organs—the small and large intestines.
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The small intestine is an ~7 meter-long tube with an inner diameter of just 2.5 cm. Since most nutrients are absorbed here, the inner lining of the...
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Small Intestine01:15

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The small intestine is primarily responsible for digestion and nutrient absorption. It spans from the pyloric sphincter to the ileocecal valve and connects to the large intestine.
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Large Intestine01:09

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The large intestine is divided into three main regions: the cecum, colon, and rectum. Extending from the ileocecal valve to the anus, it frames the small intestine on three sides.
The ileocecal sphincter, a mucous membrane fold, guards the opening from the ileum to the large intestine. This valve permits material from the small intestine to pass into the large intestine. Attached to the ileocecal valve is the cecum. This small pouch, approximately 6 cm long, has a twisted, coiled tube known as...
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The large intestine, a vital component of the gastrointestinal tract, is structured with four main layers: the mucosa, submucosa, muscularis, and serosa. Each layer performs a distinct role in facilitating the smooth functioning of the large intestine.
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Histology of the Small Intestine

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The small intestine exhibits a unique histological structure that significantly enhances its function in digestion and nutrient absorption. These structures include circular folds, villi, and various specialized cells that collectively facilitate the digestion of food.
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N-acetylcysteine modulates lipopolysaccharide-induced intestinal dysfunction.

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N-Acetylcysteine (NAC) enhances livestock gut health by reducing inflammation and oxidative stress. This feed additive improves intestinal barrier function and wound healing, benefiting animal performance.

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Area of Science:

  • Animal Science
  • Molecular Biology
  • Gastroenterology

Background:

  • The gastrointestinal epithelium is crucial for nutrient absorption and pathogen defense, with dysfunction impacting livestock productivity.
  • N-Acetylcysteine (NAC) is known to improve mucosal function, but its precise molecular effects on intestinal health require further elucidation.

Purpose of the Study:

  • To investigate the molecular mechanisms by which dietary N-Acetylcysteine (NAC) impacts intestinal function in livestock, particularly under inflammatory conditions.
  • To analyze the effects of NAC on gene expression, inflammation, oxidative stress, and barrier function in porcine intestinal epithelial cells.

Main Methods:

  • Gene expression profiling of pig small intestine following dietary NAC treatment and lipopolysaccharide (LPS) challenge.
  • In vitro analysis of NAC's effects on porcine intestinal epithelial cells (IPEC-J2) exposed to LPS.
  • Assessment of inflammatory markers (TNF-α, NF-κB, IFN-γ, IL-6), oxidative stress, and barrier function.

Main Results:

  • Dietary NAC altered 959 genes in the small intestine, impacting immune response, inflammation, and key signaling pathways (Toll-like receptor, Jak-STAT, TNF).
  • NAC significantly reduced LPS-induced expression of TNF-α, NF-κB, IFN-γ, and IL-6 in IPEC-J2 cells.
  • NAC alleviated oxidative stress, improved intestinal barrier function, and enhanced wound healing in LPS-challenged intestinal cells.

Conclusions:

  • Dietary NAC acts as a beneficial feed additive for livestock, modulating intestinal inflammation, permeability, and wound healing under LPS-induced stress.
  • NAC enhances livestock intestinal health by positively impacting molecular pathways involved in immune response and cellular repair.
  • This study provides a deeper molecular understanding of NAC's benefits for gut health in livestock production systems.