title: Effects of CD14, TLR2, TLR4, LPB, and IL-6 gene polymorphisms on Chlamydia pneumoniae growth in human macrophages in vitro.
abstract: Chlamydia pneumoniae is an obligate intracellular gram-negative bacterium, which causes respiratory infections in humans. It can infect various cell types, e.g. vascular endothelial cells, smooth muscle cells and monocyte-derived macrophages in vitro. The susceptibility of macrophages from healthy individuals to C. pneumoniae infection is highly variable. In this study, we evaluated the effects of innate immunity genes CD14 -260 C>T, TLR2 Arg753Gln, TLR4 Asp299Gly, LBP Phe436Leu and IL6 -174 G>C polymorphisms on C. pneumoniae growth in human macrophages in vitro. The growth of C. pneumoniae was highest in CD14 -260 C>T TT genotype cells and the difference to CC and CT genotypes was statistically significant (P = 0.032 and 0.022 respectively). The G-allele of the IL6 -174 G>C polymorphism had a positive influence on chlamydial growth; the difference was statistically significant only between CC and GC genotypes (P = 0.018). TLR2 Arg 753Gln, TLR4 Asp299Gly, LBP Phe436Leu polymorphisms showed no effect on chlamydial growth.
authors.affiliation: Department of Medical Microbiology, Institute of Diagnostics, University of Oulu, Oulu, Finland. kari.poikonen@oulu.fi
authors.forename: K
authors.initials: K
authors.lastname: Poikonen
authors.forename: T
authors.initials: T
authors.lastname: Lajunen
authors.forename: S
authors.initials: S
authors.lastname: Silvennoinen-Kassinen
authors.forename: M
authors.initials: M
authors.lastname: Leinonen
authors.forename: P
authors.initials: P
authors.lastname: Saikku
mesh_terms: D000209:Acute-Phase Proteins / Q000235:genetics; D002352:Carrier Proteins / Q000235:genetics; D002690:Chlamydia Infections / Q000235:genetics; D016993:Chlamydophila pneumoniae / Q000502:physiology*; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D007113:Immunity, Innate / Q000235:genetics*; D066298:In Vitro Techniques; D015850:Interleukin-6 / Q000235:genetics; D018950:Lipopolysaccharide Receptors / Q000235:genetics; D008264:Macrophages / Q000276:immunology / Q000382:microbiology*; D008297:Male; D008562:Membrane Glycoproteins / Q000235:genetics; D008875:Middle Aged; D011110:Polymorphism, Genetic; D020133:Reverse Transcriptase Polymerase Chain Reaction; D051195:Toll-Like Receptor 2 / Q000235:genetics; D051197:Toll-Like Receptor 4 / Q000235:genetics; D000099231:Lipopolysaccharide-Binding Protein
chemical_list: D000209:Acute-Phase Proteins; D002352:Carrier Proteins; D015850:Interleukin-6; D018950:Lipopolysaccharide Receptors; D008562:Membrane Glycoproteins; D051195:Toll-Like Receptor 2; D051197:Toll-Like Receptor 4; D000099231:Lipopolysaccharide-Binding Protein; C495342:TLR2 protein, human; C495345:TLR4 protein, human