The toll-like receptor 4 Asp299Gly variant: no influence on LPS responsiveness or susceptibility to pulmonary tuberculosis in The Gambia
Copyright policy )The toll-like receptor 4 Asp299Gly variant: no influence on LPS responsiveness or susceptibility to pulmonary tuberculosis in The Gambia
Tuberculosis (TB) remains a major cause of morbidity and mortality worldwide. Studies in a murine model of pulmonary TB have identified a role for Toll-like receptor 4 (TLR4) in the development of chronic lung infection with Mycobacterium tuberculosis. The Asp299Gly polymorphism in the human TLR4 gene is associated with in vivo hyporesponsiveness to lipopolysaccharide (LPS) in Caucasians.To determine whether TLR4 Asp299Gly influences LPS responses or susceptibility to pulmonary TB in humans in a Gambian population sample.We compared whole blood monokine responses to LPS in 245 healthy blood donors stratified by TLR4 Asp299Gly genotype to assess whether this polymorphism was functional in this population. A case-control study of 640 subjects was conducted to investigate whether TLR4 Asp299Gly was associated with TB.LPS-induced tumour necrosis factor, interleukin-1 beta and interleukin-10 production was not influenced by TLR4 Asp299Gly genotype. There was no association between TLR4 Asp299Gly and TB.Our data suggest that TLR4 Asp299Gly has no influence on monocyte LPS responses or susceptibility to TB in Gambians and could be an ancient neutral polymorphism.
- Wellcome Trust United Kingdom
- University of Cambridge United Kingdom
- Université Libre de Bruxelles Belgium
- Medical Research Council United Kingdom
- Tropical Diseases Research Centre Zambia
Adult, Lipopolysaccharides, Male, Adolescent, Genotype, Tumor Necrosis Factor-alpha -- analysis, Pulmonary -- immunology, Receptors, Cell Surface, Cell Surface -- immunology, Gene Frequency, Interleukin-1 -- analysis, Receptors, Tuberculosis, Humans, Genetic Predisposition to Disease, Polymorphism, Tuberculosis, Pulmonary, Membrane Glycoproteins, Polymorphism, Genetic, Tumor Necrosis Factor-alpha, Toll-Like Receptors, Genetic Predisposition to Disease -- genetics, Cell Surface -- genetics, Interleukin-10 -- analysis, Sciences bio-médicales et agricoles, Middle Aged, Pulmonary -- ethnology, Pulmonary -- genetics, Up-Regulation, Interleukin-10, Toll-Like Receptor 4, Membrane Glycoproteins -- immunology, Membrane Glycoproteins -- genetics, Case-Control Studies, Lipopolysaccharides -- immunology, Gambia, Genetic -- genetics, Interleukin-1
Adult, Lipopolysaccharides, Male, Adolescent, Genotype, Tumor Necrosis Factor-alpha -- analysis, Pulmonary -- immunology, Receptors, Cell Surface, Cell Surface -- immunology, Gene Frequency, Interleukin-1 -- analysis, Receptors, Tuberculosis, Humans, Genetic Predisposition to Disease, Polymorphism, Tuberculosis, Pulmonary, Membrane Glycoproteins, Polymorphism, Genetic, Tumor Necrosis Factor-alpha, Toll-Like Receptors, Genetic Predisposition to Disease -- genetics, Cell Surface -- genetics, Interleukin-10 -- analysis, Sciences bio-médicales et agricoles, Middle Aged, Pulmonary -- ethnology, Pulmonary -- genetics, Up-Regulation, Interleukin-10, Toll-Like Receptor 4, Membrane Glycoproteins -- immunology, Membrane Glycoproteins -- genetics, Case-Control Studies, Lipopolysaccharides -- immunology, Gambia, Genetic -- genetics, Interleukin-1
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