Objective To study the expression of lectin-like oxidized LDL receptor-1 (LOX-1) protein in acute lung injury (ALI) and the effect of captopril on this expression in order to investigate its role in the process and preliminary intervention.Methods Sprague-Dawley rats were randomly divided into 3 groups,normal control group,lipopolysaccharide (LPS) groups,and a LPS+captopril group,each group 10 rats.ALI model was induced by intratracheal injection of LPS (5 mg/kg),then those of LPS+captopril group were give an intraperitoneal injection of captopril (1.25 mg/kg).The animals of normal control group received an intratracheal injection of normal saline.In 6 h after LPS injection,the level of p(O2),wet/dry ratio (W/D),concentration of total protein in bronchoalveolar lavage fluid (BALF) and lung tissue histopathological changes were examined.The expression of LOX-1 protein in the lung tissue was measured by Western blot analysis.HE staining was used to examine the pathological changes of the lung.Results Histological examination showed that extensive lung inflammation were seen in the LPS group,which manifested by accumulation of significant numbers of neutrophils.The level of p(O2) in LPS group [(6.86?0.75) kPa] was decreased compared with that in sham group [(12.14?0.60) kPa,P

Objective To investigate of effect and mechanism of honokiol against acute lung injury (ALI) induced by lipopolysaccharide (LPS).Methods Forty SPF BALB/c mice were randomly divided into 5 groups (N =8),normal control group,LPS group,low-and high-dose magnolol groups,and dexamethasone group.The mouse model of ALI was induced by LPS.After intraperitoneal injection of honokiol,we detected neutrophil count,concentration of albumin,and pulmonary myeloperoxidase (MPO) activity in bronchoalveolar lavage fluid (BALF)as well as alveolar permeability.We also detected the levels of malondialdehyde (MDA),protein carbonyl content(PCC),reactive oxygen species (ROS) and glutathione(CAT),and the activities of superoxide dismutase (SOD),catalase,glutathione peroxidase (GPx),and glutathione-S-transferase(GST) in lung tissue of mice.Results In the LPS group,the neutrophil count,albumin concentration,MPO activity and Evans blue (EB)content were increased (P ＜ 0.05),and anti-oxidase activity was decreased significantly (P ＜ 0.05).After treatment with honokiol,the neutrophil count,albumin concentration,MPO activity,EB content,and lipid peroxidation level were decreased significantly,and the activities of antioxidant enzymes were increased significantly (P ＜ 0.05).Conclusion Honokiol has protective effects against LPS-induced acute lung injury through inhibiting oxidative stress.

Polymyxins are the last resort for the treatment of multidrug-resistant Gram-negative bacterial infections, but their neurotoxicity limits their clinical application. This paper discussed the molecular structure of polymyxins as well as the clinical manifestations, toxicity mechanisms, and prevention measures of their neurotoxicity, and it also pointed out the shortcomings of existing researches on neurotoxicity reports, and attempted to correlate the daily dose of polymyxins with neurotoxicity manifestations based on existing literatures, providing a reference for the rational use of polymyxins and the prevention of neurotoxicity in clinical practice.

Objective A precise microinvasive robot system coupled with a cooperative robot matrix and an end effector of a wire-controlled microvariable path robot was proposed.A puncture needle structure,including the rigid body of the outer needle,non-uniform flexible body of the inner needle,force control wire,internal imaging of the image fiber,and other components,was designed to verify the feasibility of this system.Methods By constructing the puncture structure of the puncture robot,the structural optimization design of the key components affecting the variable-path precision puncture needle was analyzed by constructing the puncture structure of a puncture robot.Based on the orthogonal experimental design method,a three-factor and three-level experiment that primarily affected the accuracy of the puncture needle was designed,namely,the starting distance of the hole center from the edge,the diameter of the hole,and the distance between the two holes.The experiment was verified and simulated using a real object.Results The displacement of the titanium-nickel needle tip had a significant relationship with the starting distance of the hole center from the edge,and the main and secondary influencing factors were as follows:starting distance of the hole center from the edge>hole diameter>hole distance.When the starting distance of the hole center from the edge was 1 mm,the diameter of the hole was 0.2 mm,and the distance between the two holes was 2.6 mm,the displacement of the titanium-nickel needle tip was the maximum value.Conclusions The experiment verified the functional applicability of the designed system and the linear elastic hysteresis characteristics of variable path puncture,providing a reference for further in vivo experiments and system optimization.