Effects of continuous low-dose infusion of lipopolysaccharide on expression of E-selectin and intercellular adhesion molecule-1 messenger RNA and neutrophil accumulation in specific organs in dogs.
OBJECTIVE
To determine the effects of continuous low-dose infusion of lipopolysaccharide (LPS) on the expression of E-selectin and intercellular adhesion molecule-1 (ICAM-1) mRNA and neutrophil accumulation in the lungs, liver, spleen, small intestine, and pancreas in dogs.


METHODS
11 healthy adult Beagles.


METHODS
Dogs received a continuous infusion of a low dose (10 microg/kg/h, i.v.) of LPS (Escherichia coli 055:B5) or saline (0.9% NaCI) solution (20 mL/kg/h, i.v.) for 8 hours. Activity levels of tumor necrosis factor-alpha (TNF-alpha), interleukin-1beta (IL-1beta), and interleukin-6 (1L-6) and the number of WBCs in circulation were examined before and 1, 2, 4, and 8 hours after the onset of LPS infusion. Expression of E-selectin and ICAM-1 mRNA and the number of neutrophils in each tissue were examined.


RESULTS
After the onset of LPS infusion, serum TNF-alpha and IL-1beta activities transiently increased. Thereafter, IL-6 activity increased, and high IL-6 activity was maintained throughout the experiment. In dogs in the LPS group, expression of E-selectin mRNA increased only in the lungs, and expression of ICAM-1 mRNA increased in the lungs and liver; the number of neutrophils in the tissue increased in the lungs and liver.


CONCLUSIONS
Results suggested that expression of E-selectin and ICAM-1 mRNA increased during sepsis, particularly in the lungs and liver, and that this increase was associated with neutrophil accumulation. Hence, inhibiting the activation of endothelial cells in the lung and liver may decrease organ damage caused by accumulated neutrophils and help regulate multiple-organ dysfunction.
Sakaue
Yoko
Y
Division of Veterinary Surgery, Nippon Veterinary and Animal Science University, 1-7-1 Kyonan-cho, Musashino-shi, Tokyo 180-8602, Japan.
Nezu
Yoshinori
Y
Yanagisawa
Satomi
S
Komori
Shinobu
S
Hara
Yasushi
Y
Takahashi
Kimimasa
K
Tagawa
Masahiro
M
Ogawa
Ryo
R
D000818:Animals; D004285:Dogs / Q000276:immunology*; D019040:E-Selectin / Q000096:biosynthesis*; D005260:Female; D015870:Gene Expression / Q000187:drug effects*; D018799:Intercellular Adhesion Molecule-1 / Q000096:biosynthesis*; D007375:Interleukin-1 / Q000378:metabolism; D015850:Interleukin-6 / Q000378:metabolism; D007421:Intestine, Small / Q000276:immunology; D008070:Lipopolysaccharides / Q000633:toxicity*; D008099:Liver / Q000276:immunology; D008168:Lung / Q000276:immunology; D008297:Male; D009504:Neutrophils / Q000187:drug effects / Q000502:physiology*; D010179:Pancreas / Q000276:immunology; D012333:RNA, Messenger / Q000378:metabolism; D018805:Sepsis / Q000276:immunology; D013154:Spleen / Q000276:immunology; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
D019040:E-Selectin; D007375:Interleukin-1; D015850:Interleukin-6; D008070:Lipopolysaccharides; D012333:RNA, Messenger; D014409:Tumor Necrosis Factor-alpha; D018799:Intercellular Adhesion Molecule-1