Expression of triggering receptor-1 in myeloid cells of mice with acute lung injury

Abstract

Abstract:

BACKGROUND: Myeloid cell (TREM-1) is an important mediator of the signal transduction pathway in inflammatory response. In this study, a mouse model of acute lung injury (ALI) by intraperitoneal injection of lipopolysaccharide (LPS) was established to observe the expression pattern of TREM-1 in lung tissue and the role of TREM-1 in pulmonary inflammatory response to ALI.

METHODS: Thirty BALB/C mice were randomly divided into a normal control group (n=6) and an ALI group (n=24). The model of ALI was made by intraperitonal injection of LPS in dose of 10 mg/kg. Specimens from peripheral blood and lung tissue were collected 6, 12, 24 and 48 hours after LPS injection. RT-PCR was used to detect TREM-1 mRNA, and ELISA was employed for detection of TREM-1 protein and TNF-a protein, and HE staining was performed for the pathological Smith lung scoring under a light microscope.

RESULTS: The expressions of TREM-1 mRNA in lung tissue and blood of the ALI group 6, 12, 24, and 48 hours after injection of LPS were higher than those in the control group. The levels of TREM-1 protein and the levels of TNF-a protein in lung tissue of the ALI group 6, 12, 24, and 48 hours after LPS injection were higher than those of the control group; the level of TREM-1 protein peaked 12 hours after LPS injection, but it was not significantly correlated with the expression of TREM-1 mRNA (P=0.14); the TNF-a concentration was positively correlated with TREM-1 levels in lung tissue and with Smith pathological score (r=0.795, P=0.001:r=0.499, P=0.034), but not with the expression of TREM-1 mRNA (P=0.176).

CONCLUSIONS: The expression of TREM-1 mRNA in lung tissue of mice with ALI is elevated, and the expression of TREM-1 mRNA is related to the level of TNF-a and the severity of inflammatory response to ALI. The expressions of the TREM-1 gene are not consistent with the levels of TREM-1 protein, suggesting a new functional protein involved in immune regulation.

Key words: Acute lung injury, Triggering receptor-1, Myeloid cell, Expression, Tumor necrosis factor, Pathological scoring

Ning Liu, Qin Gu, Yi-shan Zheng. Expression of triggering receptor-1 in myeloid cells of mice with acute lung injury[J]. World Journal of Emergency Medicine, 2010, 1(2): 144-148.

Figures/Tables 2

References 22

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Variables	Control group	ALI group
Variables	Control group	6 hours	12 hours	24 hours	48 hours
TREM-1mRNA (lung)	1.00±0.00	6.61±0.08^*	34.71±0.83^*#	61.85±14.05^*#Δ	56.46±8.89^*#Δ
TREM-1mRNA (blood)	1.00±0.00	14.01±3.24^*▲	47.07±0.98^*#▲	8.18±0.43^*#Δ▲	8.06±0.05^*#Δ▲
TREM-1 concentration (pg/ml)	279.22±4.63	997.8±114.62^*	1579.70±45.92^*#	1123.9±108.2^*#Δ	429.8±89.96^*#Δ
TNF-α concentration (pg/ml)	256.6±28.31	313.16±39.50^*	491.91±96.65^*#	388.48±29.84^*#Δ	282.5±52.76^*#Δ☆
Smith pathological scores	0.32±0.28	8.46±0.96^*	7.70±0.81^*	6.95±1.25^*	7.40±0.76^*

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