KMID : 0620920180500040049
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Experimental & Molecular Medicine 2018 Volume.50 No. 4 p.49 ~ p.49
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Protectin DX increases alveolar fluid clearance in rats with lipopolysaccharide-induced acute lung injury
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Zhuo Xiao-Jun
Hao Yu Cao Fei Yan Song-Fan Li Hui Wang Qian Cheng Bi-Huan Ying Bin-Yu Smith Fang Gao Jin Sheng-Wei
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Abstract
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Acute respiratory distress syndrome is a life-threatening critical syndrome resulting largely from the accumulation of and the inability to clear pulmonary edema. Protectin DX, an endogenously produced lipid mediator, is believed to exert anti-inflammatory and pro-resolution effects. Protectin DX (5?¥ìg/kg) was injected i.v. 8?h after LPS (14?mg/kg) administration, and alveolar fluid clearance was measured in live rats (n?=?8). In primary rat ATII epithelial cells, protectin DX (3.605?¡¿?10?3?mg/l) was added to the culture medium with LPS for 6?h. Protectin DX improved alveolar fluid clearance (9.65?¡¾?1.60 vs. 15.85?¡¾?1.49, p?0.0001) and decreased pulmonary edema and lung injury in LPS-induced lung injury in rats. Protectin DX markedly regulated alveolar fluid clearance by upregulating sodium channel and Na, K-ATPase protein expression levels in vivo and in vitro. Protectin DX also increased the activity of Na, K-ATPase and upregulated P-Akt via inhibiting Nedd4?2 in vivo. In addition, protectin DX enhanced the subcellular distribution of sodium channels and Na, K-ATPase, which were specifically localized to the apical and basal membranes of primary rat ATII cells. Furthermore, BOC-2, Rp-cAMP, and LY294002 blocked the increased alveolar fluid clearance in response to protectin DX. Protectin DX stimulates alveolar fluid clearance through a mechanism partly dependent on alveolar epithelial sodium channel and Na, K-ATPase activation via the ALX/PI3K/Nedd4?2 signaling pathway.
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KEYWORD
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Acute inflammation, Biological therapy
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