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Summer-type hypersensitivity pneumonitis
1First Department of Internal Medicine, Kumamoto University School of Medicine.
Abstract:
Summer-type hypersensitivity pneumonitis (SHP), the most prevalent type of HP in Japan, is caused by seasonal mold contamination in the home environment. The causative agent of the disease is Trichosporon cutaneum. The fungus grows in warm, moldy, decaying organic matter, and scatters in the air from the colonizing places. The inhaled fungi sensitize susceptible patients intratracheally and induce the disease. Glucuronoxylomannan of the fungus has a potent antigenicity that causes granulomatous alveolitis. Assay of anti-T. cutaneum antibody is very useful to establish the diagnosis of the disease because the antibody activity is virtually positive in all cases of the disease. Elimination of T. cutaneum from the colonizing places prevents recrudescence. SHP, a new form of HP, had been considered to be peculiar to Japan, but the first case of SHP outside Japan was identified in Korea last year. Soon it will be recognized in many countries of temperate and tropical clime.
Insights
Summer-type hypersensitivity pneumonitis (SHP) is an allergic lung disease caused by Trichosporon cutaneum mold. Diagnosis is aided by detecting anti-T. cutaneum antibodies, and eliminating the mold prevents recurrence.
Area of Science:
- Pulmonary Medicine
- Environmental Health
- Mycology
Background:
- Summer-type hypersensitivity pneumonitis (SHP) is a prevalent form of hypersensitivity pneumonitis (HP) in Japan.
- It is linked to seasonal mold contamination within domestic environments.
- The primary causative agent identified is the fungus Trichosporon cutaneum.
Purpose of the Study:
- To elucidate the etiology and diagnostic markers of Summer-type hypersensitivity pneumonitis (SHP).
- To understand the role of Trichosporon cutaneum in the pathogenesis of SHP.
- To discuss the diagnostic utility of anti-T. cutaneum antibody assays and prevention strategies.
Main Methods:
- Identification of Trichosporon cutaneum as the causative agent.
- Investigation of the fungal components responsible for antigenicity, such as Glucuronoxylomannan.
- Evaluation of anti-T. cutaneum antibody levels for diagnostic purposes.
Main Results:
- Trichosporon cutaneum, found in warm, decaying organic matter, releases airborne spores that sensitize susceptible individuals.
- Glucuronoxylomannan, a component of T. cutaneum, exhibits potent antigenicity, leading to granulomatous alveolitis.
- Anti-T. cutaneum antibody assays demonstrate high positivity in SHP patients, proving useful for diagnosis.
Conclusions:
- Eliminating T. cutaneum from the environment is crucial for preventing disease recurrence.
- SHP, initially thought to be unique to Japan, has been identified in Korea, suggesting a broader geographical distribution.
- The condition is expected to be increasingly recognized in temperate and tropical climates worldwide.