Objective To observe the effects of recruitment maneuver (RM) and tidal volume with different amount of gas after RM ventilation on lung diastole function in rats with acute lung injury (ALI). Method ALI rat models were induced by intravenous infusion of lipopolysaccharide (LPS) in dose of 6 mg/kg. Twenty-five rats were randomly(random number) divided into control group ( n = 5), ALI group ( n = 5), low tidal volume group (LV group,VT= 6 mL/kg, n = 5), sustained inflation (SI) with low tidal volume (SI+ LV group, VT=6 mL/kg, n = 5), and SI with moderate tidal volume group (SI+ MV group, VT= 12 mL/kg, n = 5). The RM carried out by using SI with airway pressure 30 cmH-2O for 30 seconds, and the positive end-expiratory pressure (PEEP)was set at 5 cmH2O. Lung tissue was taken after mechanical ventilation for 5 hours. The mean arterial pressure (MAP) was monitored throughout the entire course of experiment. Endothelin-1 ( ET-1 ), endothelial nitricoxide synthase (eNOS), and acetylcholine-(Ach-) induced endothelium-dependent relaxation response of isolated pulmonary artery rings were investigated after mechanical ventilation for 5 hours. Results The LPS increased the ET-1 level in lung tissue, decreased the level of eNOS in lung tissue, and impaired the Ach-induced endothelium-dependent relaxation response in pulmonary vassals, without obvious influence on systemic hemodynamics. SI + LV significantly reduced LPS-induced elevation of ET-1 level, and increased the level of eNOS, and significantly lessened endothelial dysfunction and ameliorated dysfunction od endothelium-dependent relaxation in pulmonary vas sals. Conclusions RM with high tidal volume or lowtidal volume ventilation could improve the lung vascular endothelial function of rats with acute lung injury, and RM with low tidal volume ventilation could lessen more the injury of lung vascular endothelial diastole function in rats with acute lung injury.

Objective To investigate the effects of elasticity resistance (Ers) in respiratory system on oxygenation in patients with acute lung injury (ALI) after recruitment maneuvers (RM). Method Meta-analysis of data about the effects of recruitment maneuvers on oxygenation in ALI patients with different elasticity resistances in respiratory system carried out with pooling of study-oriented data stored in Pubmed, Embase, Web of Science databases from January 1999 to June 2010. Results A total of 281 articles were taken, and 20 of them included a sample size of 395 ALI patients. In patients treated with RM in different degrees of respiratory system elasticity resistance ( ≥33.3 cmH2O/L and ＜33.3 cmH2O/L), the effect of RM was better in patients with the high respiratory system elasticity resistance than that with the low one [(51.97 + 8.89) mmHg vs. (35.13 ± 10.33 ) mmHg], P ＜ 0. 01 ), but the high respiratory system elasticity resistance was potentially to lower blood pressure [(4. 33 ± 1.32 ) mmHg vs. (0.22 ± 1.03 ) mmHg],P ＜ 0.01 ). Conclusions This study suggests RM could improve oxygenation of ALI patients with high respiratory system elasticity resistance, and caution must be made to avoid hypotension during RM.

One alkaline protease from Actinomucor elegans AS3.2778 was purified protein. The enzyme was purified using ammonium sulfate precipitation, ion exchange chromatography, hydrophobic chromatography and size exclusion chromatography method, and its properties were also investigated. The molecular weight of this enzyme is 32 kDa with SDS-PAGE method, optimum temperature is 60℃, optimum pH is 8.5 to 10.5, it is stable in the pH range of 6.0 to 9.0 at < 40℃ temperature, and being completely inhibited by the serine protease inhibitor, PMSF, indicated that it belongs to the serine protease family. Specificity test indicated this protease has extensive selectivity to peptide bones, especially to peptide bones composed of Leucine residue.

Electromagnetic Fields ; Magnetic Fields ; Microwaves ; adverse effects ; Television

Objective To explore the effects and safety of hemoperfusion(HP) therapy on tetramine poisoning in infants.Methods Thirty-five infants with tetramine poisoning were divided into two groups: HP group(n=18) and non HP group(n=17).The changes of blood tetramine concentration and clinical symptom improving of both groups after the treatment were observed together with the adverse effects of HP group.Results The average blood tetramine concentration of HP group was higher than that of non HP group(342.2?333.4 vs 117.9?50.8 ?g/L,P

0.05),while the level of IL-8,TNF-? and endotoxin changed significantly during CRRT(Pa

BACKGROUND: This study aimed to observe the effect of recruitment maneuver (RM) and post-RM ventilation at different tidal volume on lung vascular diastole endothelial function in rats with acute lung injury (ALI). METHODS: A ALI rat model was produced by intravenous infusion of lipopolysaccharide (6 mg/kg). Twenty-five rats were randomly divided into five groups: control group (n=5), ALI group (n=5), low tidal volume group (LV group, VT 6 mL/kg, n=5), sustained inflation (SI) with low tidal volume group (SI+LV group, VT 6 mL/kg, n=5), and SI with moderate tidal volume group (SI+MV group, VT 12 mL/kg, n=5). RM was performed with SI, airway pressure 30 cmH2O for 30 seconds, and positive end-expiratory pressure (PEEP) was set to 5 cmH2O. Lung tissue was taken after 5 hours of mechanical ventilation. Mean arterial blood pressure (MAP) was monitored during the experiment. Endothelin-1 (ET-1), endothelial nitricoxide synthase (eNOS), Ach-induced endothelium-dependent relaxation response of isolated pulmonary artery rings were determined at 5 hours. RESULTS: LPS increased ET-1 level, decreased the expression of eNOS in lung tissue, impaired the Ach-induced endothelium-dependent relaxation response in the pulmonary artery, without obvious effect on systemic hemodynamics. SI+LV significantly reduced LPS-induced elevation of ET-1 level, increased the expression of eNOS, significantly improved endothelial dysfunction, and improved the dysfunction of endothelium-dependent relaxation in the pulmonary artery. CONCLUSIONS: RM with a high or low tidal volume ventilation could improve the lung vascular endothelial function of rats with acute lung injury, and RM with low tidal volume ventilation could lower significantly the injury of lung vascular endothelial diastole function in rats with acute lung injury.

OBJECTIVETo investigate the effect of docosahexaenoic acid (DHA) on invasiveness of aflatoxin B1 (AFB1)-induced hepatocellular carcinoma cells in vitro.

METHODSHepG2.2.15 cells were exposed to different concentrations of AFB1 and DHA plus AFB1. The cell migration and invasion were assessed using wound-healing and Transwell assay, and flow cytometry was used to analyze the cell cycle changes. The ultrastructural changes of the cells were observed by transmission electron microscopy.

RESULTSCompared with the control group, the cells exposed to2 µmol/L AFB1 showed obviously enhanced migration and invasion with decreased cell ratio in G1/G1 phase and increased cell ratio in G2/M phase but no changes in S phase cells; transmission electron microscopy revealed the presence of multiple nucleoli and significantly increased mitochondria and Golgi apparatus in the exposed cells. Compared with AFB1-exposed cells, the cells treated with DHA and AFB1 showed decreased migration and invasion abilities, and the G1/G1 phase cells increased and G2/M phase cells decreased significantly; ultrastructurally, the cells contained single nucleoli with decreased mitochondria and vacuolization occurred in the cytoplasm.

CONCLUSIONDHA can significantly inhibit AFB1-induced enhancement of cell migration and invasion in hepatocellular carcinoma cells in vitro.

Aflatoxin B1 ; pharmacology ; Carcinoma, Hepatocellular ; pathology ; Cell Cycle ; Cell Movement ; drug effects ; Docosahexaenoic Acids ; pharmacology ; Golgi Apparatus ; Hep G2 Cells ; Humans ; Liver Neoplasms ; pathology ; Mitochondria ; Neoplasm Invasiveness

This study was purpose to explore whether the dysplasia of myelodysplastic syndromes (MDS) is unspecific feature or results of the abnormal clone, and to provide the evaluation of abnormal clone changes in bone marrow cells of MDS patients. The dysplasia cells in bone marrow smears was analyzed by morphologic observation, the clonal origin and development in 16 cases of MDS with abnormality of chromosome karyotypes were investigated by FISH combined with morphologic observation. The results found that both the dysplastic and nondysplastic bone cells displayed abnormal clones in the erythroid and granulocytic cells. The dysplastic bone marrow cells displayed more abnormal clones than the nondysplastic bone marrow cells in most of the patients, and the abnormal clones displayed more dysplastic cells than the normal clones. Most of the dysplastic and nondysplastic megakaryocytes were derived from abnormal clones. The abnormal clone showed a decreasing trend from the primitive stage to the terminal stage of cell differentiation. It is concluded that there is a correlation between the dysplastic cells and the abnormal clones in MDS, but the dysplasia of bone marrow cells is not a specific feature. The abnormal clones can differentiate into mature granulocytes and erythrocytes, and can be in coexistence with cells originated from the normal clones.
Adult ; Aged ; Bone Marrow Cells ; cytology ; pathology ; Bone Marrow Examination ; Clone Cells ; Female ; Humans ; In Situ Hybridization, Fluorescence ; Karyotyping ; Male ; Middle Aged ; Myelodysplastic Syndromes ; blood ; genetics ; Young Adult

OBJECTIVETo evaluate effects of cypermethrin on the testis histology and testosterone, LH and FSH in adult male Sprague-Dawley rats.

METHODSThe intact adult male rats were randomly divided into five groups and were treated with cypermethrin at doses of 0, 7.5, 15, 30, or 60 mg/kg per day by oral gavage for 15-days. After the treatments, serum was collected for hormone assays. The testes, epididymides, seminal vesicles, and prostates were excised and weighed. The right testis was frozen for daily sperm production and the left one was processed for histopathology.

RESULTSDaily sperm production decreased significantly in 30 and 60 mg/(kg•day) groups. Testicular structure abnormalities included atrophic and distorted seminiferous tubules, deformed and disordered arrangement of germ cells, reduced germ cells, Sertoli cells and Leydig cells, vacuolization and multinucleated formations of spermatids in the cypermethrin-treated rats. Vacuolization was found in Sertoli cells and the deformed nucleus was noted in Leydig cells. Serum testosterone reduced significantly in 30 and 60 mg/(kg•day) groups. Serum FSH increased significantly in 60 mg/(kg•day) group.

CONCLUSIONCypermethrin induces impairments of the seminiferous tubules structure and spermatogenesis in the rats. The damages of the male reproductive system may be attributed to the imbalance of circulating testosterone.

Animals ; Epididymis ; drug effects ; Male ; Prostate ; drug effects ; Pyrethrins ; pharmacology ; Rats ; Rats, Sprague-Dawley ; Seminal Vesicles ; drug effects ; Spermatogenesis ; drug effects ; Testis ; drug effects ; Testosterone ; blood