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Intestinal Epithelial Atrophy – Causes, Symptoms & Treatment

Intestinal epithelial atrophy refers to the deterioration of the cells lining the gut, impairing nutrient absorption and the intestinal barrier function.

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Things worth knowing about "Intestinal Epithelial Atrophy"

Intestinal epithelial atrophy refers to the deterioration of the cells lining the gut, impairing nutrient absorption and the intestinal barrier function.

What Is Intestinal Epithelial Atrophy?

Intestinal epithelial atrophy describes the loss or degeneration of the epithelial cells that line the inner surface of the intestine. This cell layer, known as the intestinal epithelium, is responsible for absorbing nutrients, water, and electrolytes, while also serving as a critical barrier against pathogens and harmful substances. In atrophy, the characteristic intestinal villi – small finger-like projections of the mucosa – decrease in height and function, significantly reducing the absorptive surface area of the gut.

Causes

Intestinal epithelial atrophy can be triggered by a variety of factors:

Coeliac disease: An autoimmune reaction to gluten causes destruction of the intestinal villi in the small intestine.
Malnutrition: Insufficient nutrient intake, particularly protein deficiency, damages the rapidly dividing epithelial cells.
Total parenteral nutrition (TPN): Long-term intravenous feeding without oral intake deprives the gut of its normal physiological stimulation, leading to mucosal atrophy.
Inflammatory bowel disease: Chronic inflammation such as Crohn's disease can permanently damage the mucosal structure.
Infections: Certain bacterial, viral, or parasitic infections (e.g., giardiasis, rotavirus) can cause transient atrophy.
Radiation therapy: Ionising radiation to the abdominal area can damage the intestinal epithelium.
Immunodeficiency: Congenital or acquired immune disorders can impair regeneration of the intestinal epithelium.
Medications: Cytostatic agents and certain other drugs can inhibit cell division in the intestinal epithelium.

Symptoms

Symptoms depend on the extent of atrophy and the affected intestinal segment. Typical manifestations include:

Malabsorption: Poor uptake of nutrients, vitamins, and minerals
Diarrhoea (often fatty, known as steatorrhoea)
Weight loss and undernutrition
Bloating and abdominal pain
Nutritional deficiencies: e.g., iron deficiency, vitamin B12 deficiency, calcium deficiency
Fatigue and general weakness
In severe cases: oedema due to protein deficiency

Diagnosis

The diagnosis of intestinal epithelial atrophy involves several investigative approaches:

Endoscopy with biopsy: Tissue sampling from the intestinal mucosa followed by histological examination is the gold standard. A typical finding is flattened or absent villi.
Imaging: Ultrasound, CT, or MRI to assess the intestine and surrounding structures.
Laboratory tests: Full blood count, nutritional status (iron, vitamin B12, folate, calcium), inflammatory markers, and specific antibodies (e.g., anti-transglutaminase antibodies in suspected coeliac disease).
Breath tests: To detect malabsorption or bacterial overgrowth.

Treatment

Treatment is directed at the underlying cause:

Gluten-free diet: In coeliac disease, a strict gluten-free diet allows the intestinal mucosa to regenerate.
Treatment of the underlying condition: Inflammatory diseases, infections, or immunodeficiencies are managed specifically.
Nutritional therapy: Adapted diet with easily absorbable nutrients; in cases of severe malabsorption, enteral or parenteral nutritional support may be required.
Supplementation: Correction of nutritional deficiencies through targeted vitamin and mineral supplementation.
Medication adjustment: Discontinuation or replacement of mucosal-damaging medications where possible.
Growth factors: In specific clinical situations, agents such as glucagon-like peptide 2 (GLP-2) or epidermal growth factor (EGF) may be used to stimulate regeneration of the intestinal epithelium.

Prognosis

The prognosis depends on the underlying cause and the timing of treatment. When treated promptly – especially in coeliac disease – complete regeneration of the intestinal mucosa is possible in many cases. Chronic or advanced atrophy, such as that caused by long-standing inflammatory bowel disease or radiation damage, may persist and require long-term medical management.

References

Guandalini S, Assiri A. Celiac disease: a review. JAMA Pediatrics. 2014;168(3):272-278.
Greenberger NJ, Blumberg RS, Burakoff R (eds.). Harrison's Gastroenterology and Hepatology. 3rd edition. McGraw-Hill Education; 2016.
World Health Organization (WHO). Malnutrition. Fact Sheet. Available at: https://www.who.int/news-room/fact-sheets/detail/malnutrition (accessed 2024).

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