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AIM: To investigate the effect of oxypeucedanin (OPD) on doxorubicin resistance in human breast cancer MCF-7/DOX cells and its possible mechanism. METHODS: MCF-7/DOX cells were cultured in vitro, MTT assay was used to detect the effect of OPD on the survival of MCF-7/DOX cells, and the effect of OPD combined with different concentrations of doxorubicin on the proliferation of MCF-7/DOX cells were investigated. The effect of OPD combined with doxorubicin on the expression of genes including MDR1, MRP1, AGPAT2, CHKA, CEPT1, DGKA, PCYT1A, PLA2G15 in MCF-7/DOX cells was measured by qRT-PCR. The effect of OPD combined with doxorubicin on the protein expression of MDR1, MRP1, CHKA and CCTα in MCF-7/DOX cells was determined by Western blot. RESULTS: The IC
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Objective To investigate the distribution and drug resistance of pathogen for pulmonary infection in cervical spinal cord inju-ry (CSCI) patients, and analyze the application of antibiotics. Methods From January, 2014 to June, 2015, 156 patients with CSCI were re-viewed. The bacteriology and drug resistance were investigated, as well as the application of antibiotics. Results There were 45 cases with nosocomial infection of 68 times, and 106 strains of bacteria in total. The top four Gram-negative pathogens were Klebsiella pneumonia (17.9%), Pseudomonas aeruginosae (15.1%), Encherichia coli (11.3%) and Acinetobacter baumannii (8.5%). The main Gram-positive cocci was Staphylococcus aureus (9.4%), and the main fungi was Candida tropicalis (0.7%). Gram-negative bacteria was resistant to the second or third generation cephalosporins and quinolones moderately or severely, but sensitive toβ-lactamase inhibitor combinations and aminoglyco-sides. The main Gram-positive cocci were sensitive to vancomycin. The application of antibiotics needed to be improved. Conclusion The Gram-negative bacteria are the chief pathogen for pulmonary infection in CSCI patients, which show multiple drug-resistant. It is significant to monitor the drug resistance of bacteria and optimize antibiotics.
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Objective To investigate the flora of pathogens and antibiotic resistance of urinary tract infection after spinal cord injury. Methods From June, 2014 to June, 2015, 145 inpatients with urinary tract infection after spinal cord injury were reviewed. Results The main pathogenic germs were found as E. coli (48.9%), K. pneumonia (19.7%) and P. mirabilis (9.0%), and they were resistant to the second or third generation cephalosporins and quinolones moderately or severely, but sensitive toβ-lactamase inhibitor combinations and aminogly-cosides. The strategy of antibiotics need more reasonable. Conclusion The main pathogens in urinary tract infection after spinal cord injury are Gram-negative bacilli, that are resistant to antibiotics. The antibiotics should be selected and used rationally according to bacterial culture.
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@#Objective To pave the way for clinical therapy and reasonable administration of antibiotics, and to analyze the kinds and drug-resistance of pathogens of nosocomial infection in patients with spinal cord injury. Methods Bacteriology of infection and drug resistance were analyzed in 395 patients with spinal cord injury in the hospital from Jun., 2012 to Dec., 2013. Results There were 132 cases with nosocomial infection. Most of the infections were found in urinary tract (71.1%) and lower respiratory tract (24.2%). The main pathogenic germs were Escherichia coli (45.6%), P. Aeruginosa (18.1%), K. pneumonia (11.4%) and P. mirabilis(8.7%), which were resistant to the second or third generation cephalosporins and quinolones moderately or severely, but sensitive to β-lactamase inhibitor combinations and aminoglycosides. Conclusion The main pathogenic bacteria in nosocomial infection of patients with spinal cord injury are G- bacilli. The bacteria are resistant moderately or severely to antibiotics, which should be selected rationally by bacterial culture and drug susceptibility test, and optimized rationally with PK/PD (pharmacokinetics and pharmacodynamics).
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Objective To pave the way for clinical therapy and reasonable administration of antibiotics, and to analyze the kinds and drug-resistance of pathogens of nosocomial infection in patients with spinal cord injury. Methods Bacteriology of infection and drug resis-tance were analyzed in 395 patients with spinal cord injury in the hospital from Jun., 2012 to Dec., 2013. Results There were 132 cases with nosocomial infection. Most of the infections were found in urinary tract (71.1%) and lower respiratory tract (24.2%). The main pathogenic germs were Escherichia coli (45.6%), P. Aeruginosa (18.1%), K. pneumonia (11.4%) and P. mirabilis(8.7%), which were resistant to the sec-ond or third generation cephalosporins and quinolones moderately or severely, but sensitive toβ-lactamase inhibitor combinations and ami-noglycosides. Conclusion The main pathogenic bacteria in nosocomial infection of patients with spinal cord injury are G-bacilli. The bacte-ria are resistant moderately or severely to antibiotics, which should be selected rationally by bacterial culture and drug susceptibility test, and optimized rationally with PK/PD (pharmacokinetics and pharmacodynamics).
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<p><b>OBJECTIVE</b>To study the effect of extractive Angelica dahutica on intestinal absorption of puerarin, the mechanism of the absorption enhancement of A. dahutica was investigated, providing a new thread of combinations of the Chinese herbal drugs.</p><p><b>METHOD</b>Everted intestinal sac and in situ single pass perfusion were used to study the effect of gut absorption of puerarin solution containing the extractive A. dahurica as well as the influence of P-gp on the absorption of puerarin, and explore weather the extractive A. dahutica can enhance the absorption of puerarin and the mechanism of absorption of puerarin.</p><p><b>RESULT</b>The puerarin could be absorbed at all of four intestinal segments with increaing absorption amount perunit as follows: ileum > colon > jejunum > duodenum. The absorption of puerarin in jejunum was significantly increased with the extractive A. dahutica in situ single pass perfusion of jejunum. The apparent permeability coefficient (Papp) and absorption rate constant (Ka) of puerarin in the jejunum were descreased gradually with higher concentrations, and the Papp with the Ka of jejunum solution containing the P-gp inhibitor of verapamil were increasing respectively 2.49, 2.60 (P < 0.001) than only the jejunum solution in absorption. The absorption of jejunum in pH 5.0, 6.8 were better than it in pH 7.4.</p><p><b>CONCLUSION</b>The mechanism of absorption of jejunum was active absorption and was effected by P-gp. The extrative A. dahurica can enhance the absorption of the jejunum.</p>
Subject(s)
Animals , Male , Rats , Angelica , Hydrogen-Ion Concentration , Intestinal Absorption , Isoflavones , Pharmacokinetics , Jejunum , Metabolism , Plant Extracts , Pharmacology , Pueraria , Chemistry , Rats, Sprague-DawleyABSTRACT
To explore the mechanism of the absorption enhancement of Angelica dahurica extract (Ade), the absorption mechanism of baicalin in the Scutcllaria water extraction as well as the effect of Angelica dahurica extract on absorption of baicalin were investigated. In order to determine the main absorption site, everted intestinal sac model was used to study the effect of Angelica dahurica extract on the absorption of baicalin at duodenum, jejunum, ileum and colon. In situ single pass intestinal perfusion model was performed to study the absorption of various concentrations of baicalin and the effect of Angelica dahurica extract on the absorption of baicalin at the main absorption site. To authenticate the consequence of perfusion by getting the blood from the hepatic portal vein and determine the concentration of the baicalin in the blood. The result showed that baicalin could be absorbed at all of the four intestinal segments with increasing absorption amount per unit as follows: ileum > colon > jejunum > duodenum. The absorption ofbaicalin in the duodenum significantly increased with Angelica dahurica extract, thus, duodenum was chosen to be the studying site. Apparent permeability values (Papp) and absorption rate constant (Ka) of baicalin in the duodenum increased gradually with higher concentrations. When the concentration of baicalin rises to a certain degree, the absorption increase had a saturable process, the absorption of baicalin may be an active transportation. Baicalin may be not a substrate of P-gp as verapamil which had not significantly affected the Papp and Ka of baicalin. The absorption of baicalin in the duodenum significantly increased (P < 0.01) in the two models with Angelica dahurica extract and the concentration of baicalin in the blood from the hepatic portal vein showed that the Angelica dahurica extract can increase the absorption of baicalin.
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A mathematical model of microwave drying kinetics based on Fick's second diffusion law was established and and the influence of microwave drying on ferulic acid (FA) and hydrosafflower yellow A (HSYA) in Shuxiong prescription was studied. The proposed model has been verified by using experimental data from microwave drying of Shuxiong prescription. By increasing the microwave output power (500-650 W) and the sample amount (15-60 g), the diversion rate of FA and HSYA changed. In order to determine the kinetic parameters, the drying data were fifed to various models based on the ratios of differences between the initial and final moisture contents and equilibrium moisture content versus drying time. The activation energy was calculated using an exponential expression based on Arrhenius equation. The relationship between the drying rate constant and effective moisture diffusivity was also estimated, and it showed linear.