Chitosan have applied extensively in the field of medicine. We review the mechanism of chitosan hemostasis. The effect of chitosan on hemostasis is independent of all known“Cascade-like”coagulation pathways,induding platelets and soluble coagulant factors. Chitosan induce hemostasis by coalesce erythrocytes to one another to form a blood clot. In addition,the use of chitosan in hemostat is indicated in this paper.

The effects of chitosan and N,O-carboxymethyl chitosan on blood hemostasis are tested.The dynamic blood coagulation experiments show chitsan with low deacetylation degree has higher absorption ability.The experiments can't find that any altered red blood cell morphology or an unusual affinity between erythrocytes appears evidently in the ACD blood treated with chitosan.The concentration of the platelets on the chitosan surface may be one of causes that platelets produce blood coagulation.Chitosan is substituted by the carboxymethyl and has water solubility.But N,O-carboxymethyl chitosan can lead torouleau and not toaltering the morphology of the erythrocyte.The blood hemostasis effect is not obvious.The values of TT,PT,APTT and FIB are measured from blood and the results fail toprove that chitosan and N,O-carboxymethyl chitosan can activate the coagulation factors.

Objective RNA interference (RNAi) expression vector was constructed to inhibit the focal adhesion kinase(FAK)expression in colon carcinoma HT29 cells, and then the sensitivity of the cells to 5-fluorouracil (5-FU) was determined. Methods One specific pair of oligonucleotides with short hairpin and its negative control sequence were designed and synthesized based on FAK cDNA sequences, then they were inserted into pGenesil-l vector to generate the recombinant plasmids. After identification by the restriction endonuclease and DNA sequencing, the recombinant plasmids were transfected into HT29 cells by lipofectamine TM 2000. The stable transfected cells were selected in a medium containing geneticin G418. The change in FAK expression in HT29 cells before and after RNA interference was detected by reverse transcription and polymerase chain reaction (RT-PCR) analysis and SP immunocytochemistry technique. Sensitivity of HT29 cells to 5-FU was determined by MTT assay. Results The recombinant plasmids coincided completely with the designs in the restriction map and the sequence analysis. After FAK being targeted by RNA interference, immunocytochemistry showed the protein expression of FAK was reduced dramatically, and RT-PCR revealed FAK mRNA expression was down-regulated by 76.94% compared to that of untransfected cells. MTT assay also showed that the sensitivity of HT29 cells to 5-FU in transfected pGenesil-1-FAK vector cells was increased, while IC50 declined remarkably (P

Objective To investigate the antitumor activity of Gefitinib, a selected epidermal growth factor receptor-tyrosine kinase inhibitor, on human colorectal cancer cell lines in vitro, and to explore the relationship between the inhibitory effect of Gefitinib on cancer cells and the expression of epidermal growth factor receptor (EGFR). Methods The growth inhibitory effects of Gefitinib, which expressed as the half growth inhibition dose IC50, on colorectal cancer cells were assessed by MTT assay. EGFR mRNA expression was detected by reverse transcriptional PCR (RT-PCR). Western blot was used to determine the expression of EGFR protein as well as its phosphorylated forms (p-EGFR). Results Gefitinib inhibited growth of all the six colorectal cancer cell lines in vitro with an IC50 range from 6.5 to 172.7?mol/L. Lovo cell line, with an IC50 value less than 10?mol/L, was the most sensitive one to Gefitinib, HT29 and SW480 were moderate sensitive to 10?mol/L

Objective To study the NF-?B activity in colon carcinoma HT-29 and Lovo cells treated with different crude extracts of Abrotani herba obtained by column chromatography with macroporous resin.Methods The decoction of Abrotani herba absorbed by macroporous resin AB-8 was mounted into the column and then eluted with distilled water and 30%,50%,75% and 95% alcohol.To select appropriate concentrations for treatment,HT-29 cells were pretreated for 24 hours with each elution phase of the rude extracts in different concentrations(0,50,100,200,400 and 600?g/ml),and then their activity was detected by MTT.The HT-29 and Lovo cells were thereafter cultured in DMEM complete media respectively containing distilled water extract and 30%,50%,75% and 95% alcohol extracts in the concentrations as obtained by MTT assay,and the cells in control group were cultured in DMEM only.The cells were then harvested and the nucleic proteins were extracted for measurement with electrophoretic mobility shift assay(EMSA).Changes in NF-?B activity in HT-29 and Lovo cells treated with different concentrations of crude extracts were observed by EMSA.Results Viability of HT-29 cells treated with 400 and 600?g/ml crude extracts were significantly lower than those treated with 0-200?g/ml crude extracts(P0.05).Conclusion Crude extracts of Abrotani herba,extracted by column chromatography with macroporous resin and eluted with 30% alcohol,can inhibit NF-?B activity in colon carcinoma HT-29 and Lovo cells.

Objective:To study the expression of IFN-γ,IL-4 and IL-17 in peripheral blood of patients with oral lichen planus(OLP). Methods:The level of IFN-γ,IL-4 and IL-17 in peripheral blood were detected by ELISA in 60 OLP patients(including 30 erosive ca-ses and 30 non-erosive cases)and 25 healthy volunteers(controls).Data were statistically analyzed by SPSS 13.0.Results:(1 )The level of IFN-γin serum of patients with non-erosive OLP and erosive OLP were significantly lower than that in the controls(P<0.01);while the level of IL-4 in the patients were significantly higher than that in the controls(P<0.01),and the IFN-γ/IL-4 ratio in non-ero-sive OLP and erosive groups were significantly lower than that in the control group(P<0.01);(2)The level of IL-17 in erosive OLP pa-tients was significantly higher than that in the controls(P<0.05),while no statistical difference was seen between non-erosive OLP group and the control group(P>0.05).Conclusion:The down-regulated level of IFN-γand up-regulated level of IL-4,which result in the decrease of IFN-γ/IL-4 ratio,might be one of the immune etiological factors of OLP,while the up-regulated level of IL-17 protein in OLP may be mainly related with the inflammatory processes of OLP.

Due to its effectiveness and specificity,RNA interference (RNAi) technology is widely used in the treatment of tumor,viral infectious and metabolic diseases.Noninvasively tracing the delivery of therapeutic RNA molecules in vivo and evaluating the therapeutic effects are important to promote the clinical application of RNAi technology.Molecular imaging allows noninvasive visualization of biological processes at the cellular and molecular level in vivo.It can be used to monitor the biodistribution of therapeutic RNA molecules and to assess the effects of the RNAi.This article reviews the advance of molecular imaging in monitoring the delivery of RNAi molecules and evaluating the therapeutic effects of RNAi.

Biliary atresia ( BA) is a pediatric liver disease characterized by progressive inflammation and fi-brosis of both the extrahepatic and intrahepatic bile ducts. Even though Kasai portoenterostomy increases the survival of children with BA, 80% of patients with BA will eventually require liver transplantation, making this condition the leading indication for pediatric liver transplantation worldwide. Currently,the causes of this disease are largely unde-fined and theories of pathogenesis include viral infection,autoimmune-mediated bile duct destruction,and abnormalities in bile duct development.

The archives of a hospital are a kind of intangible assets of the hospital and archive administration in a hospital constitutes an important part of the hospital's management. It can be seen from the forming process and contents of the archives in a hospital that strengthening archive administration is beneficial to the modernized and scientific management of the hospital, the improvement of medical quality and service level, the spread and application of medical science and technology, and the safeguarding of the interests of both the hospital and patients. To give full play to the function of the archives in the construction of the hospital, it is imperative to attach importance to the fundamental work concerning archives, set up the concept of archive development and application, and improve the quality of the contingents of archive administrators. Only in this way can we meet the needs of the era of knowledge economy.

Acupuncture Therapy ; Aged ; Combined Modality Therapy ; Female ; Humans ; Male ; Middle Aged ; Parkinson Disease ; drug therapy ; therapy