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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

Yoko SakaueDivision of Veterinary Surgery, Nippon Veterinary and Animal Science University, 1-7-1 Kyonancho, Musashino-shi, Tokyo, 180-8602, Japan.

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Yoshinori NezuDivision of Veterinary Surgery, Nippon Veterinary and Animal Science University, 1-7-1 Kyonancho, Musashino-shi, Tokyo, 180-8602, Japan.

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Satomi YanagisawaDivision of Veterinary Pathology, Nippon Veterinary and Animal Science University, 1-7-1 Kyonancho, Musashino-shi, Tokyo, 180-8602, Japan.

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Shinobu KomoriDivision of Veterinary Surgery, Nippon Veterinary and Animal Science University, 1-7-1 Kyonancho, Musashino-shi, Tokyo, 180-8602, Japan.
present address is the Faculty of Agriculture, Iwate University, 3-18-8 Ueda, Moriokashi, Iwate, 020-8550, Japan.

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Yasushi HaraDivision of Veterinary Surgery, Nippon Veterinary and Animal Science University, 1-7-1 Kyonancho, Musashino-shi, Tokyo, 180-8602, Japan.

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Kimimasa TakahashiDivision of Veterinary Pathology, Nippon Veterinary and Animal Science University, 1-7-1 Kyonancho, Musashino-shi, Tokyo, 180-8602, Japan.

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Masahiro TagawaDivision of Veterinary Surgery, Nippon Veterinary and Animal Science University, 1-7-1 Kyonancho, Musashino-shi, Tokyo, 180-8602, Japan.

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Ryo OgawaDivision of Anesthesiology, Nippon Medical School, 1-5-1 Sendagi, Bunkyo-ku, Tokyo, 113-8603, Japan.

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Abstract

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.

Animals—11 healthy adult Beagles.

Procedure—Dogs received a continuous infusion of a low dose (10 µg/kg/h, IV) of LPS ( Escherichia coli055:B5) or saline (0.9% NaCl) solution (20 mL/kg/h, IV) for 8 hours. Activity levels of tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β), and interleukin-6 (IL-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-α and IL-1β 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 and Clinical Relevance—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. (Am J Vet Res 2005;66:1259–1266)

Abstract

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.

Animals—11 healthy adult Beagles.

Procedure—Dogs received a continuous infusion of a low dose (10 µg/kg/h, IV) of LPS ( Escherichia coli055:B5) or saline (0.9% NaCl) solution (20 mL/kg/h, IV) for 8 hours. Activity levels of tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β), and interleukin-6 (IL-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-α and IL-1β 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 and Clinical Relevance—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. (Am J Vet Res 2005;66:1259–1266)