Dysbiosis of lung commensal bacteria in the process of lung epithelial-mesenchymal transition in mice with silicosis / 中国职业医学

@#Objective - To investigate the effect of lung flora dysbiosis on the process of pulmonary fibrosis and lung epithelial （ ） Methods - mesenchymal transition EMT in mice with silicosis. Male C57BL/6 mice of specific pathogen free grade were ， ， ， （ ） randomly divided into the blank control group silicosis model group solvent control group vancomycin VM + ampicillin （ ） ， （ ） （ ） ， AMP group metronidazole MNZ + neomycin NEO group and mixed treatment group 12 mice in each group. Except for ， ， the blank control group which was given 20.0 µL of 0.9% NaCl solution the other five groups of mice were dosed with 20.0 µL of silica dust suspension at a mass concentration of 250.0 g/L using a single tracheal drip to establish the silicosis mouse model. ： The intranasal drip method was used to treat silicosis mice in each group as following mice in the solvent control group were - ； ； given double distilled water mice in the VM+AMP group were given VM at a mass concentration of 0.5 g/L and AMP at 1.0 g/L ； mice in the MNZ+NEO group were given MNZ at a mass concentration of 1.0 g/L and NEO at 1.0 g/L mice in the mixed ， treatment group were given the same doses of the four antibiotics mentioned above all in a drip volume of 50.0 µL. Silicosis ， ， mice were treated seven days and half an hour before silica dusting and 7 14 and 21 days after silica dusting. Mouse lungtissue was collected aseptically 28 days after silica dusting. Hematoxylin eosin and Masson trichrome staining methods were - used to observe the pathological changes. Western blotting was used to detect the relative protein expression of α smooth muscle （ - ）， - （ - ） （ ） actin α SMA E cadherin E CAD and vimentin VIM . Immunohistochemistry was used to detect the relative expression of - - E CAD and VIM. Real time fluorescence quantitative polymerase chain reaction was used to detect the expression levels of （Col1a2） Results collagen type Ⅰ alpha 2 mRNA in lung tissues. The histopathological results showed that the alveoli of the ， blank control group were thin and structurally intact with few surrounding infiltrating inflammatory cells and no abnormal ， distribution of collagen fibers. The alveoli of the silicosis model group were structurally disorganized with a large number of ， ， infiltrating inflammatory cells thickened alveolar walls and cellular fibrous nodules with abundant blue collagen deposit. In the ， ， VM+AMP group MNZ+NEO group and the mixed treatment group the inflammation and fibrosis were reduced with diferent degrees in the lung tissues compared to the silicosis model group and the solvent control group. The relative expression levels of - ， Col1a2 α SMA VIM protein and mRNA in lung tissues of mice in the silicosis model group were higher than those in the blank （ P ）， -CAD control group all <0.05 and the relative expression levels of E protein were lower than those in the blank control （P ） - ， Col1a2 group <0.05 . The relative expression levels of α SMA VIM protein and mRNA in lung tissues of mice in the MNZ+ （ P ）， -CAD NEO group and the mixed treatment group were lower all <0.05 and the relative expression levels of E protein were （P ）， Conclusion higher <0.05 when compared with the silicosis model group and the solvent control group. Pulmonary fibrosis ， - was reduced in silicosis mice with interventions in lung flora where anaerobic and gram negative bacteria affected pulmonary fibrosis and dysbiosis of the lung flora affected pulmonary EMT.

Relationship between reference values of fibrinogen and geographical factors based on neural network analysis / 南方医科大学学报

<p><b>OBJECTIVE</b>To analyze the relationship between the reference values of fibrinogen (FIB) in healthy Chinese adults and geographical factors to provide scientific evidences for establishing the uniform standard.</p><p><b>METHODS</b>The reference values of FIB of 10701 Chinese healthy adults from 103 cities were collected to investigate their relationship with 18 geographical factors including spatial index, terrain index, climate index, and soil index. Geographical factors that significantly correlated with the reference values were selected for constructing the BP neural network model. The spatial distribution map of the reference value of FIB of healthy Chinese adults was fitted by disjunctive kriging interpolation. We used the 5-layer neural network and selected 2000 times of training covering 11 hidden layers to build the simulation rule for simulating the relationship between FIB and geographical environmental factors using the MATLAB software.</p><p><b>RESULTS</b>s The reference value of FIB in healthy Chinese adults was significantly correlated with the latitude, sunshine duration, annual average temperature, annual average relative humidity, annual precipitation, annual range of air temperature, average annual soil gravel content, and soil cation exchange capacity (silt). The artificial neural networks were created to analyze the simulation of the selected indicators of geographical factors. The spatial distribution map of the reference values of FIB in healthy Chinese adults showed a distribution pattern that FIB levels were higher in the South and lower in the North, and higher in the East and lower in the West.</p><p><b>CONCLUSION</b>When the geographical factors of a certain area are known, the reference values of FIB in healthy Chinese adults can be obtained by establishing the neural network mode or plotting the spatial distribution map.</p>

Quantified diagnositic standard for large intestinal cancer of spleen qi deficiency syndrome / 中西医结合学报

Objective: To set a quantified diagnostic standard for large intestinal cancer of spleen qi deficiency syndrome. Methods: The spleen qi deficiency syndrome was identified by experts on the basis of clinical epidemiological investigation of 311 patients suffering from large intestinal cancer. Corresponding points were assigned to the correlative factors (traditional Chinese medicine symptoms) on the basis of symptom differences between spleen qi deficiency syndrome and non-spleen-qi-deficiency syndrome. The best threshold was determined by receiver operating characteristic curve (ROC) according to syndrome differentiation from expert team, and the quantified diagnostic standard was established. The syndrome identification from the expert team which was regarded as golden standard was tested retrospectively. Results: All the traditional Chinese medicine symptoms possibly related to spleen qi deficiency syndrome were analyzed based on the opinions of experts, and 28 symptoms were confirmed as candidate correlative factors. The occurrence of 11 symptoms between spleen qi deficiency syndrome and non-spleen-qi-deficiency syndrome showed statistical differences by means of crosstabs analysis (P<0.05). The 11 symptoms were filtered by logistic regression analysis, and tiredness, fatigue, loose stool, and poor appetite were finally determined as the symptoms relative to large intestinal cancer. These four symptoms were analyzed with conditional probability conversion and endowed with 16, 11, 4 and 8 points respectively. The diagnostic standard of spleen qi deficiency syndrome of large intestinal cancer was over 13 points. The sensitivity, specificity and accuracy of retrospective examination were all above 80%, and its positive likelihood ratio was 9.89. Conclusion: The quantified diagnostic standard for spleen qi deficiency syndrome of large intestinal cancer is in accordance with clinical characteristics of large intestine cancer and the characteristics of TCM syndrome diagnosis.

Effects of volatile oil of Rhizoma zingiberis and other two kinds of volatile oil on percutaneous penetration of bullatine A via hairless mouse skin in vitro / 中国中药杂志

<p><b>OBJECTIVE</b>To investigate the effects of volatile oils of Rhizoma Acori Tatarinowii (RAT), Semen Myristicae (SM) and Pericarpium Citri Reticulatae (PCR) on percutaneous penetration of bullatine A via hairless mouse skin in vitro.</p><p><b>METHOD</b>By an improved Franz diffusion, the effects of three kinds of volatile oils on the percutaneous penetration of bullatine A were observed and compared with Azone, and the cumulative amount of bullatine A was determined by HPLC.</p><p><b>RESULT</b>The penetration enhancement ratios of bullatine A with 7% volatile oil RAT and SM, 5% volatile oil of PCR and 3% Azone were 6.52, 6.74, 2.18, 6.03, respectively.</p><p><b>CONCLUSION</b>The volatile oil of RAT, SM and PCR enhance permeation of bullatine A, effectively.</p>

Effects of different interventions for early-stage acute lung injury on respiratory response and work of breathing in canine model / 南方医科大学学报

<p><b>OBJECTIVE</b>To evaluate the effects of different interventional strategies, namely controlled high-concentration oxygen therapy, continuous positive airway pressure (CPAP) and bi-level positive airway pressure (BiPAP) ventilation, on respiratory response and work of breathing (WOB) in canine models of early-stage acute lung injury (ALI).</p><p><b>METHODS</b>After successful duplication of ALI models with oleic acid (diagnostic criteria: Pa(O2)/Fi(O2)<or=300 mmHg), 24 adult mongrel dogs were randomized into 3 equal groups for treatment with controlled high-concentration oxygen therapy (O2), CPAP, and BiPAP, respectively. The parameters of respiratory response and WOB were recorded continuously at the baseline, early-stage ALI, and 1-4 hours after treatment.</p><p><b>RESULTS</b>BiPAP resulted in the most significant effects in reducing the respiratory rate (RR) and f/V(T) (P<0.001), followed by CPAP and O2 interventions (P<0.001). None of the 3 treatments showed obvious effects on V(E) (P>0.05), which maintained the level of early ALI/ARDS stage. BiPAP greatly improved V(T) and V(T)/Ti, showing better effects than CPAP and O2. No significant differences were noted among the 3 groups in T(I)/T(tot) (P>0.05). BiPAP showed superior effect to CPAP in lowering the peak transdiaphragmatic pressure (Pdi). CPAP and BiPAP both effectively counteracted intrinsic positive end expiratory pressure (PEEPi) (P<0.01), while O2 produced no obvious such effects (P>0.05). BiPAP showed the most evident effects, followed by CPAP, in reducing WOB, but oxygen therapy produced no obvious effects. CPAP (P<0.01) and BiPAP (P>0.05) both effectively reduced the proportion of ingredients in WOB related to PEEPi.</p><p><b>CONCLUSION</b>BiPAP and CPAP can produce favorable effects in relieving dyspnea, reducing WOB and improving respiratory response to control the deterioration of ARDS. BiPAP has more significant therapeutic effects than CPAP and oxygen therapy.</p>

Study on pharmacokinetics of crebanine injection in rabbits / 中国中药杂志

<p><b>OBJECTIVE</b>To develop an HPLC method for the determination of serum level of Crebanine (Cre) and study on the pharmacokinetics of Cre injection in rabbits.</p><p><b>METHOD</b>To sample blood serum from the rabbits' ears which were injected the Cre by 2.0 mg x kg(-1) at different time and use HPLC to determine the concentration of Cre in it, the pharmacokinetic parameters were accessed by the DAS software.</p><p><b>RESULT</b>Cre was fitted to a two compartment open pharmacokinetic model in rabbits. There was no signifiant difference between the male and female rabbits'pharmacokinetic by t-test. The mainly pharmacokinetic parameters were: t1/2alpha = (3. 246 +/-0.222) min, t1/2beta = (36.67+/-5.52) min, Cmax = (1.401 +/- 0.062) mg x L(-1), Vd = (5.928 +/- 0.877) L x kg(-1), Cl = (0. 051 +/-0.003) L x min(-1) x kg(-1).</p><p><b>CONCLUSION</b>This experiment can objectively show the pharmacokinetics regularity of Crebanine injection in rabbits. Crebanine injection was a speeding disposition drug (t1/2 <1 h) and disposed extensively and rapidly in rabbits.</p>

Assessment of early-stage physiological response to acute lung injury in canine models using balloon catheter system for measuring esophageal and gastric pressure / 南方医科大学学报

<p><b>OBJECTIVE</b>To explore feasible and reliable methods for estnbolishment and of acute lung injury model in animal models.</p><p><b>METHODS</b>Twenty-four healthy adult mongrel dogs with oleic acid-induced acute lung injury were evaluated for early-stage physiological response to acute lung injury using a balloon catheter system for measuring esophageal and gastric pressure.</p><p><b>RESULTS</b>In canine models of early-stage oleic acid-induced acute lung injury that sustained spontaneous breathing, in terms of respiratory mechanics, some parameters obviously increased including the respiratory rate (RR), minute ventilation (VE), peak inspiratory volume (Vinsp, peak), mean inspiratory volume (VT/Ti), inspiratory airway resistance (Raw, insp) (P<0.001 for all the parameters), with also significantly increased peak transdiaphragmatic pressure (Pdi, peak, P=0.0185). The tidal volume (VT) and dynamic lung compliance (CL,dyn), however, were significantly decreased (P<0.001), and significant variation occurred in the ratio of inspiratory time to duration of one breath (Ti/Ttot, P=0.163). In terms of gas exchange, the pH, PaO(2), SaO(2), PaO(2)/FiO(2), and end tidal partial pressure of carbon dioxide (PETCO(2)) all evidently declined (P<0.001), but PaCO(2) and ratio of alveolar dead space to tidal volume [VD(alv)/VT] increased significantly (P<0.001).</p><p><b>CONCLUSION</b>Application of balloon catheter system for measuring esophageal and gastric pressures allows objective evaluation of the various physiological responses in early stage of acute lung injury.</p>