Protective effects of colquhounia root tablet against oleic acid induced acute lung injury in rats / 中华麻醉学杂志

ABSTRACT

Objective To study the protective effects of colquhounia root tablet against oleic acid-induced acute lung injury (ALI) .Methods Forty-eight healthy Wistar rats weighing 200-250 g were randomly divided into 3 groups ALI group ( n = 18) ; colquhounia root tablet group ( n = 18) and control group ( n = 12) . The animals were anesthetized with intraperitoneal 2% pentobarbital. ALI was induced by intravenous injection of oleic acid 0.04 ml?kg-1. In colquhounia root group colquhounia root tablet 300 mg?kg-1 was instilled into the stomach twice a day for 10 days before Ⅳ oleic acid injection. In control group normal saline 0.04 ml?kg-1 was given Ⅳ instead of oleic acid. The animals were killed 4h after intravenous oleic acid. Blood was collected from left ventricle immediately before the animals were killed for determination of expression of CD11a, CD11b and CD18 in neutrophils, monocytes and lymphocytes by flow cytometry using monoclonal antibodies. The lungs were immediately removed and left lung was lavaged via left main bronchus. Broncho-alveolar lavage fluid (HALF) was collected, WBC count in BALF and the percentage of active neutrophils were determined. Lung permeability index (BALF protein concentration/plasma protein concentration) was calculated. Results The expression of CD11la, CD11b and CD18 in neutrophils and monocytes, the lung permeability index, the WBC count and percentage of active neutrophils in BALF were significantly higher in ALI group than in control group. Colquhounia root tablet pretreatment significantly attenuated the changes induced by Ⅳ oleic acid. Conclusion Colquhounia root tablet pretreatment can effectively protect the animals from oleic acid induced ALI by downregulation of the expression of CD11a / CD18 and CD11b / CD18 in WBC.