We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Functional Analysis of Genetic Variations in Surfactant Protein D in Mycobacterial Infection and Their Association With Tuberculosis.
- Authors
Hsieh, Miao-Hsi; Ou, Chih-Ying; Hsieh, Wen-Yu; Kao, Hui-Fang; Lee, Shih-Wei; Wang, Jiu-Yao; Wu, Lawrence S. H.
- Abstract
Surfactant proteins (SPs)-A and -D are C-type lectins of the collectin family and function in the clearance of infectious particles in the lungs. Some polymorphisms of SPs that give rise to amino acid changes have been found to affect their function. Several SP-A gene polymorphisms have been reported to be associated with respiratory infection diseases, such as tuberculosis (TB). However, the relationship between surfactant proteins D (SP-D) polymorphisms and TB is still unclear. To study the associations between SP-D polymorphisms and TB, the correlations of SP-D polymorphisms with TB were examined in a case–control study, which included 364 patients with TB and 177 control subjects. In addition, we cloned two major SP-D exonic polymorphism C92T (rs721917) and A538G (rs2243639) constructs and used these for <italic>in vitro</italic> assays. The effects of SP-D polymorphisms on agglutination and other interactions with <italic>Mycobacterium bovis</italic> bacillus Calmette–Guérin (<italic>M. bovis</italic> BCG) were evaluated. In comparison with SP-D 92C (amino acid residue 16, Threonine), our results showed that SP-D 92T (amino acid residue 16, Methionine) had a lower binding ability to <italic>M. bovis</italic> BCG, a lower capacity to inhibit phagocytosis, lesser aggregation, poorer survival of bacillus Calmette–Guérin (BCG)-infected MH-S cells, and less inhibition of intracellular growth of <italic>M. bovis</italic> BCG. The case–control association study showed that the 92T homozygous genotype was a risk factor for TB. However, a lesser effect was seen for polymorphism A538G. In conclusion, the results of functional and genetic analyses of SP-D variants consistently showed that the SP-D 92T variant increased susceptibility to TB, which further confirmed the role of SP-D in pulmonary innate immunity against mycobacterial infection.
- Subjects
PULMONARY surfactant-associated protein D; TUBERCULOSIS; MYCOBACTERIUM
- Publication
Frontiers in Immunology, 2018, pN.PAG
- ISSN
1664-3224
- Publication type
Article
- DOI
10.3389/fimmu.2018.01543