enterocytes
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The absorptive workhorses of the intestinal lining — each one a tiny transporter moving nutrients from the gut into the bloodstream.
Enterocytes are the predominant cell type covering the surface of the villi in the small intestine. Each enterocyte is a polarized cell with two distinct sides:
- Apical face (facing the gut lumen) — covered in microvilli (the "brush border"), packed with transport proteins and digestive enzymes
- Basolateral face (facing the bloodstream) — where absorbed nutrients are released into capillaries and lymphatics
Lifespan and Turnover
Enterocytes live only 2–5 days. They are continuously produced in the crypts of Lieberkühn, migrate up the villus surface, perform their absorptive function, and are shed from the villus tip. This rapid turnover means the gut lining is constantly regenerating — which also means it's vulnerable to anything that disrupts that regeneration cycle.
Role in Celiac Disease
In celiac disease, enterocytes are on the front line of damage:
- gliadin peptides that cross the epithelial barrier are processed by enterocytes and handed to immune cells below
- tissue-transglutaminase (tTG), expressed on enterocyte surfaces, modifies gliadin peptides into more immunogenic forms
- As the immune attack escalates, enterocytes are destroyed faster than the crypts can replace them — leading to villous-atrophy
- Surviving enterocytes are dysfunctional — their brush border enzymes (including lactase) are depleted, causing secondary lactose intolerance
The marsh-classification counts intraepithelial-lymphocytes per 100 enterocytes as a measure of immune infiltration severity.
Recovery
On a gluten-free-diet, enterocyte function recovers as inflammation resolves and villi regenerate. Brush border enzyme activity normalises, and secondary lactose intolerance often resolves.
Related Concepts
villi | tight-junctions | tissue-transglutaminase | intraepithelial-lymphocytes | villous-atrophy | crypt-hyperplasia | malabsorption