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Mucosal Barrier of the Stomach01:25

Mucosal Barrier of the Stomach

The gastric glands contain parietal cells that secrete hydrochloric acid (HCl) for digestion. The cells secrete HCl because it is highly corrosive and essential for breaking down food. To achieve this, they secrete hydrogen and chloride ions into the lumen of the gastric glands, which combine to form HCl.
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Glycans, a class of complex heterogeneous molecules, can be covalently attached to proteins to form glycosylated proteins that regulate various physiological and pathological processes. Glycosylated proteins or glycoproteins comprise N-linked and O-linked oligosaccharides. O-glycosylation is the most common type of protein glycosylation. Here, glycans attach to the oxygen atom of the hydroxyl groups of Serine or Threonine residues. O-linked glycosylation occurs later in protein processing,...
Classification of Epithelial Tissues: Glandular Epithelium01:20

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The glandular epithelium is made of one or more epithelial cells modified to synthesize and secrete chemical substances. Glandular epithelia can be classified based on cell number. Unicellular glands have individual secretory cells scattered across the epithelial monolayer. In contrast, multicellular glands consist of a hollow tubular duct attached to the cluster of secretory cells located in the deep pockets.
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Histology of the Gastrointestinal (GI) Tract01:20

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Updated: Jul 14, 2026

Mucin Agarose Gel Electrophoresis: Western Blotting for High-molecular-weight Glycoproteins
09:24

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Published on: June 14, 2016

Mucin glycoarray in gastric and gallbladder epithelia.

Iniya Meenakshi Ganesh1, Duraibabu Subramani, Devaraj Halagowder

  • 1Unit of Biochemistry, Department of Zoology, University of Madras, Life Sciences Building, Guindy Campus, Chennai - 600025, India. ini_ganesh@yahoo.co.in

Journal of Carcinogenesis
|June 15, 2007
PubMed
Summary

Alterations in gastric mucins, specifically increased acidic mucins, are linked to gastric cancer progression and gallstone formation. Sulfomucins play a key role in gallstone development, while sialomucins and sulfomucins are vital in cancer metastasis.

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Using Unfixed, Frozen Tissues to Study Natural Mucin Distribution
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Published on: June 14, 2016

Profiling of Permethylated Mucin O-glycans Using Matrix-assisted Laser Desorption/Ionization Time-of-flight Mass Spectrometry
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Using Unfixed, Frozen Tissues to Study Natural Mucin Distribution
11:39

Using Unfixed, Frozen Tissues to Study Natural Mucin Distribution

Published on: September 21, 2012

Area of Science:

  • Gastroenterology
  • Oncology
  • Biochemistry

Background:

  • Mucins are vital cytoprotective glycoproteins in the gastric epithelium.
  • Altered mucin expression is observed in various pathological conditions.

Purpose of the Study:

  • To assess the utility of mucins in understanding gastric cancer progression.
  • To investigate the role of mucins in gallstone formation.

Main Methods:

  • Gastric biopsy and gallbladder tissues were analyzed using Alcian Blue (AB) and Periodic acid-Schiff's (PAS) staining.
  • Alcian Blue staining differentiated sialomucins and sulfomucins.
  • PAS staining identified neutral mucins.

Main Results:

  • Neutral mucins predominated in normal gastric and gallbladder mucosa.
  • A significant increase in acidic mucins was observed in intestinal metaplasia, gastric carcinoma, and gallstones.
  • Sulfomucins showed a greater association with gallstone formation compared to neutral mucins.

Conclusions:

  • Sulfomucins appear to play a more significant role in gallstone formation than neutral mucins.
  • Sialomucins and sulfomucins are important in gastric cancer progression and metastasis.
  • Further research is needed to elucidate the precise roles of mucins in gastric malignancy and gallstone pathogenesis.