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Localization and functions of SP-A and SP-D at mucosal surfaces
B A van Rozendaal1, L M van Golde, H P Haagsman
1Department of Biochemistry, Cell Biology and Histology and Graduate School Animal Health, Utrecht University, Utrecht, The Netherlands.
Pediatric Pathology & Molecular Medicine
|August 7, 2001
Summary
Pulmonary surfactant proteins A (SP-A) and D (SP-D) are key innate immune molecules in the lung. These collectins also protect other mucosal surfaces, offering defense against pathogens in the respiratory and gastrointestinal tracts.
Area of Science:
- Immunology
- Pulmonary Medicine
- Microbiology
Background:
- Pulmonary surfactant proteins A (SP-A) and D (SP-D) are collectins crucial for lung innate immunity.
- Collectins possess collagen-like and carbohydrate-recognition domains, enabling pathogen interaction.
Purpose of the Study:
- To investigate the role of SP-A and SP-D beyond the lung.
- To explore their function in innate mucosal defense at various body sites.
Main Methods:
- Detection of SP-A and SP-D protein and mRNA in various tissues.
- Analysis of collectin interaction with microbial glycoconjugates.
Main Results:
- SP-A and SP-D were detected in the respiratory tract, gastrointestinal tract, middle ear, and peritoneal cavity.
- These proteins interact with diverse pathogens, including viruses, bacteria, and fungi.
- Collectins enhance pathogen clearance by phagocytes.
Conclusions:
- SP-A and SP-D contribute to innate mucosal defense at multiple body sites.
- These collectins are vital for host defense, particularly in neonates and immunocompromised individuals.