Dendritic cells in the mucosa of the human trachea are not regularly found in the first year of life

• Published in: Thorax Vol. 56; no. 6; pp. 427 - 431
• Main Authors: Tschernig, T, Debertin, A S, Paulsen, F, Kleemann, W J, Pabst, R
• Format: Journal Article
• Language: English
• Published: London BMJ Publishing Group Ltd and British Thoracic Society 01-06-2001; BMJ; BMJ Publishing Group Ltd; BMJ Publishing Group LTD; BMJ Group
• Subjects: Adolescent; Adult; Aged; Aged, 80 and over; Analysis; Antibodies; Antigen presenting cells; Autopsy; Babies; Bacterial diseases; Bacterial diseases of the respiratory system; Biological and medical sciences; Child; Child, Preschool; Death, Sudden - pathology; Dendritic cells; Dendritic Cells - immunology; Health aspects; Human bacterial diseases; human respiratory mucosa; Humans; Immunity, Cellular; Immunohistochemistry - methods; Infant; Infant, Newborn; Infants (Newborn); Infections; Infectious diseases; Lymphatic system; Measurement; Medical sciences; Middle Aged; Morphology; Original; Ostomy; Respiratory Hypersensitivity - immunology; Respiratory Hypersensitivity - pathology; Respiratory mucosa; Respiratory Mucosa - immunology; Respiratory Tract Diseases - immunology; Respiratory Tract Diseases - pathology; Retrospective Studies; Sudden Infant Death - immunology; Sudden Infant Death - pathology; Trachea - immunology; Transmission electron microscopy; Virus Diseases - immunology; United States; United States > US; Germany; Human; Dendritic cell; Respiratory disease; Sudden death; Mucosa; Exploration; Infant; Immune regulation; Respiratory system; Infection; Autopsy; Trachea; Comparative study
• ISSN: 0040-6376; 1468-3296
• DOI: 10.1136/thorax.56.6.427

BACKGROUND Dendritic cells (DCs) in the mucosa of the respiratory tract might be involved in the early development of pulmonary allergy or tolerance. To date, little is known about when the first DCs occur in human airways. METHODS Specimens of the distal trachea from patients who had died from sudden death in the first year of life (n=29) and in older age groups (n=59) as well as from those who had died from respiratory tract infections in the first year of life (n=8) were examined by immunohistochemistry. Transmission electron microscopy was performed in additional samples from two adults. RESULTS In the sudden death subgroup DCs were absent in 76% of those who died in the first year of life but were present in 53 of the 59 older cases. All infants who had died of respiratory infectious diseases had DCs in the tracheal mucosa. CONCLUSIONS Mature DCs are not constitutively present in the human tracheobronchial mucosa in the first year of life, but their occurrence seems to be triggered by infectious stimuli. These data support the hypothesis that DCs play a crucial role in immunoregulation in early childhood.