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Related Concept Videos

Mucosal Barrier of the Stomach01:25

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Peptic ulcer disease, commonly called PUD, represents a multifaceted condition characterized by disruptions in the lining of the gastrointestinal (GI)  tract. Central to the protection of the gastrointestinal lining is the mucosal-bicarbonate barrier. This physiological defense mechanism is a formidable shield against the corrosive effects of gastric acid and pepsin secretion in the stomach. Its role is pivotal in maintaining the structural integrity of the stomach's inner lining.
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Surface Membrane Barriers01:18

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The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
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Microvilli00:55

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Microvilli are tiny finger-like projections found on the surface of certain cells. Their purpose is to increase the surface area of the cell's apical surface, resulting in more effective absorption or secretion of substances.
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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.
Small Intestines
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Plants have the impressive ability to create their own food through photosynthesis. However, plants often require assistance from organisms in the soil to acquire the nutrients they need to function correctly. Both bacteria and fungi have evolved symbiotic relationships with plants that help the species to thrive in a wide variety of environments.
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Related Experiment Video

Updated: Dec 25, 2025

Three-dimensional Quantification of Intestinal Mucus Using Whole-mount Tissue Imaging
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Three-dimensional Quantification of Intestinal Mucus Using Whole-mount Tissue Imaging

Published on: September 12, 2025

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Mucins and the Microbiome.

Gunnar C Hansson1

  • 1Department of Medical Biochemistry, University of Gothenburg, SE 405 30 Gothenburg, Sweden;

Annual Review of Biochemistry
|April 4, 2020
PubMed
Summary
This summary is machine-generated.

Mucins are large glycoproteins that form protective barriers on inner surfaces, crucial for separating gut bacteria from epithelial cells. Their complex structure and function in mucus formation remain a key area for biochemical research.

Keywords:
bacteriacarbohydrateglycanintestinemucussaccharide

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Using Unfixed, Frozen Tissues to Study Natural Mucin Distribution
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Area of Science:

  • Biochemistry
  • Glycobiology
  • Cell Biology

Background:

  • Mucins are large glycoproteins essential for forming protective barriers on internal epithelial surfaces.
  • They exist as gel-forming and transmembrane types, characterized by extensive O-glycosylation.
  • Mucins play critical roles in host defense, including microbial clearance and barrier integrity.

Purpose of the Study:

  • To elucidate the structural complexity and functional mechanisms of mucins in forming protective mucus layers.
  • To understand the role of mucins in the host-microbe interactions within the gastrointestinal tract.
  • To identify the biochemical challenges in understanding mucin assembly and glycocalyx construction.

Main Methods:

  • Characterization of mucin structure and O-glycosylation patterns.
  • Analysis of mucin function in epithelial barrier formation.
  • Investigation of host-microbe interactions involving mucins and bacterial degradation.

Main Results:

  • Mucins form extended, rod-like structures through diverse glycosylation.
  • Gel-forming mucins, like MUC2, are vital for the inner mucus layer in the large intestine, separating bacteria from host cells.
  • Bacterial degradation of mucin glycans provides energy shared with the host.

Conclusions:

  • Mucins are fundamental to creating protective epithelial barriers against microbial challenges.
  • The intricate glycosylation and assembly of mucins are critical for mucus layer function.
  • Further biochemical research is needed to fully understand mucin complex formation and their role in the extracellular glycocalyx.