Gastric mucin proteins (MUC5AC/MUC6)

Gastric mucin proteins, primarily Mucin-5AC (MUC5AC) and Mucin-6 (MUC6), are high-molecular-weight, heavily glycosylated proteins that form the structural backbone of the gastric mucus layer. MUC5AC is predominantly secreted by surface mucous cells, while MUC6 is produced by mucous neck and gland cells, together creating a stratified viscoelastic gel that protects the gastric epithelium from hydrochloric acid, pepsin, and mechanical stress (nih.gov, patsnap.com). These proteins also serve as a critical component of the innate immune system by trapping pathogens such as Helicobacter pylori and maintaining a stable pH gradient through the entrapment of bicarbonate ions (nih.gov, acs.org). In clinical practice, gastric mucins are significant therapeutic targets for cytoprotective agents like rebamipide and misoprostol, which stimulate their production to promote mucosal healing in gastritis and peptic ulcer disease (nih.gov, droracle.ai). Conversely, alterations in mucin expression, such as the loss of MUC5AC or the aberrant expression of intestinal mucins like MUC2, are key biomarkers for gastric atrophy, intestinal metaplasia, and gastric cancer progression (nih.gov, researchgate.net). Understanding the regulation and structural integrity of these proteins is essential for developing treatments that reinforce the gastric barrier and for identifying early molecular changes in gastrointestinal malignancies (nih.gov, mdpi.com).

Other names

Gastric mucusMucin-5ACMucin-6GastromucinMUC5ACMUC6Apolipoprotein-like mucin

Stimulation of mucin synthesis and secretion via prostaglandin or growth factor pathways, enhancement of the mucus-bicarbonate barrier, and physical binding to the mucosal surface to provide a protective coating.