Systemic responsiveness to lipopolysaccharide and polymorphisms in the toll-like receptor 4 gene in human beings

O. Michel*, T.D. Levan, D. Stern, M.A. Dentener, J. Thorn, D. Gnat, M.L. Beijer, P. Cochaux, P.G. Holt, F.D. Martinez, R. Rylander

*Corresponding author for this work

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Systemic responsiveness to lipopolysaccharide and polymorphisms in the toll-like receptor 4 gene in human beings.

Michel O, LeVan TD, Stern D, Dentener M, Thorn J, Gnat D, Beijer ML, Cochaux P, Holt PG, Martinez FD, Rylander R.

Clinic of Allergology and Respiratory Diseases, CHU Saint-Pierre (ULB), Brussels, Belgium.

BACKGROUND: The response to lipopolysaccharide exposure is highly variable and might be a result of genetic diversity between individuals. The toll-like receptor 4 (TLR-4) is the principal receptor for lipopolysacharide. OBJECTIVES: We investigated the association between single-nucleotide polymorphisms in the TLR4 locus and levels of systemic inflammatory markers in response to lipopolysaccharide. METHODS: Healthy subjects (n = 116) were genotyped for the most frequent polymorphisms found in the promoter and coding region of the TLR4 gene (-2026A/T, -1607T/C, +896A/G, and +1196C/T relative to the translation start site). Subjects were challenged with 20 microg lipopolysaccharide by inhalation. RESULTS: Polymorphisms at +896 and +1196 were in complete linkage disequilibrium, and no homozygotes for the less common allele, G and T respectively, were found. After lipopolysaccharide inhalation, subjects heterozygous for either TLR-4/+896 or TLR4/+1196 had significantly lower numbers of white blood cell counts and lower levels of C-reactive protein and lipopolysaccharide-binding protein compared with homozygotes with the common allele. None of the heterozygous subjects (n = 18) except 1 were high responders to lipopolysaccharide (defined as a rise in C-reactive protein > 10 mg/L), whereas 36 of 98 homozygous subjects were high responders (P <.02). No association was observed between the TLR-4/-2026 and TLR-4/-1607 polymorphisms and lipopolysaccharide responsiveness. CONCLUSION: The single-nucleotide polymorphisms at position +896 or +1196 in the TLR-4 gene is associated with systemic inflammatory hyporesponsiveness to inhaled lipopolysaccharide
Original languageEnglish
Pages (from-to)923-929
Number of pages6
JournalJournal of Allergy and Clinical Immunology
Issue number5
Publication statusPublished - 1 Jan 2003

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