Use of 3-hydroxy fatty acid concentrations in a murine air pouch infection model as a surrogate marker for LPS activity: a feasibility study using environmental Burkholderia cenocepacia isolates.
Using a murine hypodermic air pouch infection model designed to mimic the release of bacterial products at physiological levels, 3-hydroxy fatty acid (3-OH FA) and endotoxin unit levels from Burkholderia cenocepacia isolates were assessed. The B. cenocepacia environmental isolates (n=35) survived in the hypodermic air pouch but did not invade across the peritoneal epithelial layer during a 72-h infection. For all 35 strains, when the molar ratio of C(14:0) 3-OH FA to C(16:0) 3-OH FA in the air pouch fluid wash samples was between 1.4 and 2.5, the concentrations of C(14:0) 3-OH FA were correlated with the endotoxin unit levels. However, both surrogate markers exhibited different correlations to the inflammatory response. The linear regression coefficient was 0.4234 for C(14:0) 3-OH FA concentrations vs. NO productions, 0.223 for endotoxin unit levels vs. NO productions, 0.5008 for C(14:0) 3-OH FA concentrations vs. TNF-alpha productions and 0.2869 for endotoxin unit levels vs. TNF-alpha productions. Therefore, C(14:0) 3-OH FA concentrations, rather than endotoxin unit levels, acted as an immunostimulatory indicator for LPS in the B. cenocepacia isolates.
Division of Infectious Diseases, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan.
Yao-Shen
YS
Chen
Hsi-Hsun
HH
Lin
Pei-Ju
PJ
Liu
Hsin-Ying
HY
Tsai
Pei-Tan
PT
Hsueh
Hung-Yi
HY
Liu
Ya-Lei
YL
Chen
D000818:Animals; D015415:Biomarkers; D019121:Burkholderia Infections / Q000473:pathology; D057508:Burkholderia cenocepacia / Q000737:chemistry* / Q000276:immunology / Q000302:isolation & purification / Q000472:pathogenicity*; D004195:Disease Models, Animal; D004783:Environmental Microbiology; D005227:Fatty Acids / Q000032:analysis* / Q000276:immunology / Q000633:toxicity*; D005240:Feasibility Studies; D007249:Inflammation / Q000276:immunology / Q000473:pathology*; D008070:Lipopolysaccharides / Q000032:analysis* / Q000276:immunology / Q000633:toxicity*; D051379:Mice; D008807:Mice, Inbred BALB C
D015415:Biomarkers; D005227:Fatty Acids; D008070:Lipopolysaccharides