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High--density lipoprotein attenuates lipopolysaccharide--induced acute lung injury in mice

Xiao Gelei, Luo Ziqiang, Xiao Gong, LI Chen, Xiong Xudong, Yang Ying, Liu Huijun

Grade 2004,Xiangya School of Medicine,Central South University.Changsha 410078,Hunan；China；Office of Grade 2004,Xiangya School of Medicine,Central South University.Changsha 410078,Hunan

Abstract

High-density lipoprotein (HDL), an abundant plasma lipoprotein, has been thought to be anti-inflammatory in both health and infectious diseases. It binds lipopolysaccharide (LPS) and neutralizes its bioactivity. The present study aimed to investigate the potential role of HDL, which was separated from human plasma, in LPS-induced acute lung injury in mice. Kunming mice (18-22 g) were treated with either HDL (70 mg/kg body weight, via tail vein) or saline 30 min after LPS administration (10 mg/kg body weight, intraperitoneally) and were decapitated 6 h after LPS challenge. The arterial blood was collected and analyzed for blood gas variables (PaO_(2), pH, and PaCO_(2)). The bronchoalveolar lavage fluid (BALF) samples were analyzed for total protein concentrateion, lactate dehydrogenase (LDH) activity, and white blood cell (WBC) count. The lung samples were taken for histopathological evaluation and for determination of wet-to-dry weight ratio (W/D) of lung weight, malondialdehyde (MDA) content, myeloperoxidase (MPO) activity and tumor necrosis factor 冄 (TNF-#alpha#) content. Arterial blood gas analysis showed that after LPS challenge, HDL-treated mice exhibited a higher PaO_(2), and pH, but a lower PaCO_(2) than control ones (P<0.01). LPS-induced increases in total protein concentration, WBC number and LDH activity in BALF were significantly attenuated in HDL-treated mice (P<0.01). HDL treatment also resulted in a significant protection of lung tissues against LPS-induced acute lung injury via decreasing W/D ratio, MPO activity, MDA content, and via decreasing the content of the pro-inflammatory cytokine TNF-#alpha# (P<0.05, P<0.01). Histological examination revealed that HDL treatment resulted in significantly lower scores of acute lung injury induced by LPS with reduced hemorrhage, intra-alveolar edema, and neutrophilic infiltration (P<0.01). It is suggested that HDL plays a protective role in attenuating LPS-induced acute lung injury in mice.

Key words: high-density lipoprotein;acute lung injury;lipopolysaccharide;tumor necrosis factor #alpha#

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Citing This Article：

Xiao Gelei, Luo Ziqiang, Xiao Gong, LI Chen, Xiong Xudong, Yang Ying, Liu Huijun. High--density lipoprotein attenuates lipopolysaccharide--induced acute lung injury in mice. Acta Physiol Sin 2008; 60 (3): 403-408 (in Chinese with English abstract).