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Jejunal Barrier Dysfunction – Causes and Treatment

Jejunal barrier dysfunction refers to an impaired protective barrier of the jejunum (small intestine), allowing harmful substances to pass through the intestinal wall more easily.

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Jejunal barrier dysfunction refers to an impaired protective barrier of the jejunum (small intestine), allowing harmful substances to pass through the intestinal wall more easily.

What is Jejunal Barrier Dysfunction?

Jejunal barrier dysfunction describes a condition in which the protective mucosal barrier of the jejunum – the middle section of the small intestine – is impaired. Under normal conditions, the intestinal mucosa acts as a selectively permeable barrier, allowing nutrients to enter the bloodstream while blocking pathogens, toxins, and undigested food particles. When this barrier is compromised, unwanted substances can pass more easily into the body, a phenomenon also known as increased intestinal permeability or colloquially as leaky gut.

Anatomy and Function of the Jejunum

The jejunum is the middle portion of the small intestine and plays a central role in absorbing carbohydrates, proteins, fats, vitamins, and minerals. It is lined with a multi-layered mucosa held together by tight cell-to-cell connections known as tight junctions, which regulate which molecules are allowed to cross the intestinal wall. The jejunum is also richly supplied with immune cells, lymphatic vessels, and nerve fibers that work together to maintain intestinal health.

Causes

Jejunal barrier dysfunction can be triggered or promoted by a variety of factors:

Chronic inflammatory bowel diseases such as Crohn's disease or ulcerative colitis
Coeliac disease: Gluten-induced inflammation directly damages the jejunal mucosa
Infections caused by bacteria (e.g., Salmonella), viruses, or parasites
NSAID use: Non-steroidal anti-inflammatory drugs can directly damage the intestinal lining
Chronic stress: Affects the gut-brain axis and impairs barrier function
Dysbiosis: An imbalance in the gut microbiota weakens the protective barrier
Malnutrition: Protein or zinc deficiency impairs regeneration of the intestinal mucosa
Chemotherapy and radiation therapy: Can directly damage mucosal cells

Symptoms

The symptoms of jejunal barrier dysfunction are often non-specific and can mimic many other conditions:

Bloating, abdominal pain, and feelings of pressure or fullness
Diarrhoea or altered bowel habits
Nausea and loss of appetite
Fatigue and general malaise
Nutrient deficiencies (e.g., iron deficiency, vitamin B12 deficiency) due to impaired absorption
Worsening or newly emerging food intolerances
In severe cases: weight loss and signs of malabsorption

Diagnosis

Diagnosing jejunal barrier dysfunction requires a combination of clinical evaluation, laboratory tests, and imaging procedures:

Blood tests: Inflammatory markers (CRP, ESR), albumin levels, nutrient status, specific antibodies (e.g., anti-gliadin in coeliac disease)
Stool analysis: Detection of inflammatory markers (calprotectin, lactoferrin), pathogen identification
Permeability testing: The lactulose-mannitol test measures intestinal permeability; an elevated lactulose-to-mannitol ratio indicates increased permeability
Endoscopy and biopsy: Upper gastrointestinal endoscopy with tissue sampling from the jejunum allows direct assessment of the mucosa
Imaging: MR enterography or double-balloon enteroscopy for evaluation of deeper intestinal segments
Gut microbiome analysis: Assessment of gut bacterial composition

Treatment

Treatment is directed at the underlying cause, with the goal of restoring the jejunal barrier function:

Cause-Directed Therapy

For coeliac disease: Strict gluten-free diet
For inflammatory bowel disease: Drug therapy with aminosalicylates, corticosteroids, immunosuppressants, or biologics
For infections: Antibiotic or antiparasitic treatment
Discontinuation or reduction of mucosal-damaging medications (e.g., NSAIDs)

Nutritional Therapy

High-protein diet to support mucosal regeneration
Glutamine: An important amino acid for the intestinal mucosa; frequently used in clinical settings for barrier repair
Zinc: Supports epithelial cell regeneration and tight junction function
Avoidance of irritants such as alcohol and highly processed foods

Microbiome Support

Probiotics (e.g., Lactobacillus rhamnosus, Bifidobacterium longum) can strengthen barrier function
Prebiotics (fibre-rich foods) promote a healthy gut microbiota

Supportive Measures

Stress management and psychological support (gut-brain axis)
Adequate sleep and regular physical activity
Supplementation of nutrient deficiencies (iron, vitamin D, vitamin B12)

References

Fasano A. - Intestinal permeability and its regulation by zonulin: diagnostic and therapeutic implications. Clinical Gastroenterology and Hepatology, 2012; 10(10):1096–1100.
Camilleri M. et al. - Leaky gut: mechanisms, measurement and clinical implications in humans. Gut, 2019; 68(8):1516–1526.
World Health Organization (WHO) - Nutrition for Health and Development. WHO, Geneva, 2000.

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