The sprue syndromes.

Area of Science:

• Gastroenterology
• Pathology
• Immunology

Background:

• Sprue syndromes (tropical and nontropical) present with malabsorption and villus atrophy.
• Cell kinetic studies reveal increased intestinal epithelial cell death and crypt hyperplasia in sprue.
• Pathogenesis involves enteric pathogens in tropical sprue and genetic/environmental factors (HLA, gluten) in nontropical sprue.

Purpose of the Study:

• To differentiate the pathogenesis and treatment of tropical and nontropical sprue.
• To elucidate the multifactorial causes of malabsorption in sprue syndromes.
• To explore associations between nontropical sprue, dermatitis herpetiformis, and intestinal malignancies.

Main Methods:

• Comparative analysis of clinical presentation, morphology, and pathogenesis.
• Review of cell kinetic studies on intestinal epithelial turnover.
• Examination of genetic associations (HLA haplotypes) and environmental triggers.
• Assessment of treatment responses (antibiotics, folic acid, gluten-free diet).

Main Results:

• Both sprue types exhibit villus atrophy; tropical sprue is linked to enteric pathogens post-turista, while nontropical sprue involves HLA associations and gluten sensitivity.
• Malabsorption results from impaired digestion (pancreatic/biliary secretion) and absorption (reduced microvillus enzyme activity, fewer transport carriers).
• Nontropical sprue shares features with dermatitis herpetiformis and has an increased risk of intestinal malignancies (lymphoma, adenocarcinoma).

Conclusions:

• Distinguishing tropical and nontropical sprue relies on patient history and treatment response.
• Tropical sprue is treated with tetracycline and folic acid; nontropical sprue requires a gluten-free diet.
• Nontropical sprue management includes dietary changes and monitoring for associated conditions and malignancies.