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Objective To study the potency of transdifferentiated renal tubular epithelial cells for acquiring the tissue stem cells during renal fibrosis.Methods The in vitro cellular model of renal tubular epithelial cells(NRK-52E)transdifferentiation under the inflammatory environment of the local renin-angiotensin (AngⅡ)system was established.The expression and change situation of the embryonic kidney developmental gene Pax2 and the tissue stem cell surface marker CD133 were observed.Results Local high concentration of AngⅡcould stimulate the NRK-52E cells to express Pax2 and CD133 molecule,its effect demonstrated the dose-and time-dependent relation.Conclusion The inflammatory damage leads to the transdifferentiated renal tubular epithelial cells po-tency to acquire the tissue stem cell.
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Objective To understand the structures and functions of enterovirus 71 (EV71)VP1 gene and its encoded protein using bioinformatics method, so as to direct studies of its biological function. Methods VP1 gene and its encoded protein of EV71 2008-GZCH07 strain and other representative EV71 strains were analyzed by online analysis at bioinformatics websites and software packages. Multi-sequence homological alignment and phylogenetic analysis were performed.Physicochemical characteristics, secondary structure, homology modeling of tertiary structure,enzymological characteristics, antigenic epitope of VP1 gene encoded protein were predicted. Results The homology of EV71 2008-GZCH07 strain was highest (97% and 98%) with ZJ001 strain, and lowest with human coxsackievirus A16. The homology of EV71 2008-GZCH07 strain and EV71 types A,B,C was 86%-98%. Phylogenetic analysis demonstrated that 2008-GZCH07 stain was close to ZJ001 and BJ08-Z025-5 stains, which belonged to C4 subtype. In VP1 encoded proteins of EV71 types A,B,C, the relationship between 2008-GZCH07 and EV71-B, EV71-C was closer than EV71-A.The whole length of VP1 gene was 510 bp, with open reading frame (ORF) located at 116-510 bp region,and it encoded 132 amino acids with isoelectric point of 4.39.The protein was rich of a-helix and random coilon without transmembrane regions, and contained 5 high hydrophobic regions and belonged to extracellular protein. The homology modeling of tertiary structure showed that the region was on the surface of protein and formed a binding loop. There was 5 antigen epitopes. And 7 key catalytic sites were located at or close to the loop. Conclusions EV71-VP1 encoded protein contains many phosphorylation sites, with many biological function sites and antigenic epitope regions, which might be a potential target antigen for immunodiagnosis, anti-schistosome drug and vaccine development, and would be basis of further study of diagnosis, treatment and prevention of EV71 infection.
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OBJECTIVE To investigate the distribution and the resistance variance tendency of the pathogenic bacteria isolated from the blood cultureing specimens collected during the period of 2002-2005.METHODS A retrospective analysis was made to the blood cultureing results during the period of 2002-2005 with WHONET 5.1 software.RESULTS Gram-negative rods were the predominant bacteria which caused sepsicemia,the isolated rates of Escherichia coli,Klebsiella pneumoniae and Staphylococcus aureus were the most high during the period of 2002-2004 but the S.epidermidis and S.hominis were also the important pathogenic ones which caused blood stream infection.Vancomycin and the teicoplanin were the most effective to the Gram-positive bacteria,and the imipenem and the cefepime were the most effective to the Gram-negative ones.CONCLUSIONS It′s important to strengthen the blood cultureing for blood stream infection patient.
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OBJECTIVE To investigate the clinical distribution and drug resistance of non-fermentative bacilli isolated from department of surgery so as to guide the rational use of antibiotics.METHODS VITEK-60 AMS system and Kirby-Bauer method were used to identify the pathogenic bacilli and examine the antibiotic resistance.RESULTS A total of 463 strains of nonfermentative bacteria were isolated from Jan 2002 to Dec 2004,the most common pathogen was Pseudomonas aeruginosa(55.07%),the next were Acinetobacter baumannii(20.52%) and Stenotrophomonas maltophilia(11.88%).The samples were mainly sputum(31.97%),drainage(13.39%),and wound secretion(12.31%).Isolation rate from SICU,departments of organ transplantation and burn were 28.08%,17.28% and 12.10%,respectively.P.aeruginosa,A.baumannii and S.maltophilia had high and multi-drug resistance.CONCLUSIONS Infections of respiratory tract and wound caused by non-fermentative bacilli are common in surgical department,and drug resistance is serious.The drugs should be chosen according to the results of the antimicrobial susceptibility tests.
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Objective To investigate the effects of rutaecarpine on the cerebral injury and calcitonin gene-related peptide (CGRP) level during focal cerebral ischemia-reperfusion injury in rats. Methods Rats were intravenously given three doses of rutaecarpine (50, 100 and 300?g/kg) or vehicle 30 minutes before experiment. Then the rats subjected middle cerebral artery occlusion (MCAO) for 2 hours, and neurological deficits scores were performed at 6, 12 and 24 hours after reperfusion. After the last test the animals were sacrificed, the infarct volumes were determined by TTC staining, and CGRP levels were measured by radioimmuoassay. Results Rutaecarpine significantly reduced infarct volume, and improved cerebral function in dose-dependent manner compared with vehicle. Rutaecarpine significantly inecreased brain CGRP levels after reperfusion as well. Conclusion Rutaecarpine has marked protective effects on ischemic brain damage in rats possibly by increasing CGRP release in the brain.
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Objective To evaluate the diagnostic value of three nuclide imaging methods in patients with hyperparathyroidism. Methods Thirty five patients with hyperparathyroidism underwent 201 Tl/ 99m TcO-4 (8 cases), double phase 99m Tc MIBI imaging methods (27 cases) and 99m Tc MIBI/ 99m TcO-4 substraction imaging (20 cases). Abnormal increase of radioactivity in substraction imaging or delay imaging denoted positive result. All data of nuclide imaging were evaluated according to final clinical results and were compared with ultrasound or CT. Results 35 cases of hyperparathyroidism were proved, including 31 adenomas (ectopic 1), 3 hyperplasia and 1 carcinoma. The sensitivity of 201 Tl/ 99m TcO-4 , double phase 99m Tc MIBI imaging and 99m Tc MIBI/ 99m TcO-4 substraction imaging was 62.5%, 88.9%,90.0%, respectively. The specificity of 3 nuclide imaging methods was 100%. The sensitivity and specificity of ultrasound were 74.3%, 85.7%, respectively. The sensitivity of CT was 78.6%. The results showed that 99m Tc MIBI/ 99m TcO-4 was superior to other imaging. Conclusion An accurate diagnosis of hyperparathyroidism and preoperative anatomic localization can be determined by means of nuclide imaging.