The characters of the chemical structure of CM-chitosan were studied, by assay the content of the N, carboxylation, Primary amine and DEPT,13C-NMR of CM-chitosan.

Objective To investigate the expression of heat shock protein(HSP)70 and HSP90 in patients with atrophic gastritis(AG)or gastric cancer(GC)and its significance.Methods One hundred and forty-one patients including 35 with superficial gastritis(CSG),66 with AG(miner in 21,medium in 30 and severe in 15)and 40 with GC were enrolled with mean age of 47.8,56.1 or 59.4 years,respectively.H.pylori positive patients were 12 with CSG and 28 with AG.The quantity analysis of HSP90 and HSP70 were detected by immunohistochemistry,whereas their mRNA and protein expressions were measured by Western bolt and real-time PCR,respectively.Results The mRNA expression of HSP70 was significantly higher in CSG(1.31±0.80)and AG(1.41±0.80)than that in GC(1.18±0.70,P＜0.05),but was significantly lower in miner(1.32±0.70)and medium(1.34±0.60)AG than that in severe AG(2.20±0.80,P＜0.05).The mRNA expression of HSP90 was kept on increasing in order of CSG(1.27±0.60),AG(1.53±0.80)and GC(1.84±0.70); or in order of miner(1.33±0.60),medium(1.47±0.90)and severe(2.75±0.70)(P＜0.05).The patients infected with H.pylori had higher expression of HSP90 compared with those without H. pylori infection (P＜0.05). Conclusion The synchronous increase of HSP90 and HSP70 indicates the aggravation of AG. When HSP90 is up-regulated and HSP70 is down-regulatied, it may predict the occurrence of cancer.

China ; epidemiology ; Humans ; Occupational Diseases ; epidemiology

Objective To report three cases of localized primary sclerosing cholangitis (PSC) mimicking a hilar cholangiocarcinoma (Klatskin tumor) and to summarize their clinical characteristics and the ways to differentiate them through a literature review.Method The clinical data of three patients with localized PSC mimicking a hilar cholangiocarcinoma were retrospectively analyzed.The characteristics of laboratory tests and imaging examination were reviewed,and therapy and prognosis were discussed.Results The three patients were all diagnosed to have a hilar cholangiocarcinoma preoperatively,but the diagnosis of PSC was confirmed by histopathology post-operatively.All the three patients had elevated CA19-9,2 patients had elevated anti-nuclear antibody (ANA) and 2 patients had elevated IgG.All the three patients underwent surgical resection and histopathological study showed chronic inflammation of the hilar bile ducts and cholangitis of the intrahepatic portal area.The three patients were followed up from 7 months to 8 years with no symptoms.Conclusions Localized PSC is rare and it can casily be misdiagnosed as a hilar cholangiocarcinoma.Biopsy before surgery is helpful for the differential diagnosis but it is difficult to get a good biopsy sample.Surgical resection is an effective treatment.

OBJECTIVE:To provide reference for further promoting the implementation ofseparation of prescribing and dis-pensingpolicy which fit China's national conditions. METHODS:Based on literature review,informant interview,and filed in-vestigation the development ofseparation of prescribing and dispensingwere compared between typical eastern and western coun-tries. Constraints ofseparation of prescribing and dispensingin China were explored,international successful experiences were summarized to inspire appropriate implementation of this policy in China. RESULTS & CONCLUSIONS:There are four con-straints in the implementation ofseparation of prescribing and dispensingin China. Firstly,the legal foundation is yet established for the professional development of pharmacists. Secondly,the medicine pricing and hospital financing systems are unreasonable. Thirdly,patients'ownership of prescriptions and right of dispensing options are monopolized by hospitals. Fourthly,safety of medi-cines use is yet ensured.Separation of prescribing and dispensingshould follow the rules of social and economic development and should be adjusted to adapt local conditions.Separation of prescribing and dispensingpolicy itself may not help to achieve the objectives of cost containment and rational use of medicines. To achieve the intended objectives,legislation of Pharmacist Law should also be accelerated to clearly define the role of pharmacist and guide the behavior of prescribers with economic levers.

Objective To explore the immunogenicity of recombinant chimeric 6Aβ15-T including the Aβ1-15 epitope and a T-helper epitope formulated with different adjuvants and to evaluate its feasibility as a candidate vaccine for Alzheimer disease (AD).Methods The recombinant chimeric antigen 6Aβ15-T formulated with Al adjuvant, Freund′s adjuvant or MF59 adjuvant was administered to two strains of mice .The 6Aβ15-T-immunized group without adjuvants ( Mock) and non-immunized group (Control) were included in this study as control groups .The specific antibody and cellular immune response of the chimeric antigen were evaluated .Results In BALB/c strain mice, three types of adjuvants could substan-tially boost the immunogenicity of chimeric antigen 6Aβ15-T and produce a high level of specific-Aβ(β-amyloid) antibod-ies.In C57BL/6 strain mice, the existence of adjuvants enhanced the immune response of 6Aβ15-T antigen, but the mice in Mock group also produced a strong antibody response .In two strains of mice, prevalence of anti-AβIgG1, which was an indicator of Th2 polarization, was observed in the 6Aβ15-T-immunized mice.Additionally, the Al adjuvant induced a high-er level of IgG1 antibody titers, and the ratio of IgG1/IgG2a was the largest.As expected, the 6Aβ15-T antigen formulated with or without adjuvants induced PADRE-specific, but not Aβ42-specific T cellular immune response .Conclusion The 6Aβ15-T antigens formulated with different types of adjuvants could induce strong Th 2-polarized Aβ42-specific antibody re-sponses without activating self-reactive Aβ42-specific T cells in two strains of mice .The results suggested that the recombi-nant chimeric antigen 6Aβ15-T is a good candidate vaccine for AD .

Objective:To evaluate the precision of digital impressions taken under simulated clinical impression taking conditions with TRIOS and to compare with the precision of extraoral digitalizations . Methods:Six #14 -#17 epoxy resin dentitions with extracted #16 tooth preparations embedded were made.For each artificial dentition , ( 1 ) a silicone rubber impression was taken with individual tray , poured with type IV plaster ,and digitalized with 3Shape D700 model scanner for 10 times;(2) fastened to a dental simulator , 10 digital impressions for each were taken with 3Shape TRIOS intraoral scanner .To assess the precision , best-fit algorithm and 3 D comparison were conducted between repeated scan models pairwise by Geomagic Qualify 12.0, exported as averaged errors (AE) and color-coded diagrams.Non-parametric analysis was performed to compare the precisions of digital impressions and model images .The color-coded diagrams were used to show the deviations distributions .Results:The mean of AE for digital impressions was 7.058 281 μm, which was greater than that of 4.092 363 μm for the model images (P<0.05).However, the means and medians of AE for digital impressions were no more than 10 μm, which meant that the consistency between the digital impressions was good .The deviations distribution was uniform in the model images ,while nonuniform in the digital impressions with greater deviations lay mainly around the shoulders and interproximal surfaces .Conclusion:Digital impressions with TRIOS are of good precision and up to the clinical standard .Shoulders and interproximal surfaces scanning are more difficult.

Thrombus is a major factor leading to cardiovascular diseases such as myocardial infarction and stroke. Although fibrinolytic anti-thrombotic drugs have been widely used in clinical practice, they are still limited by narrow therapeutic windows, short half-lives, susceptibility to inactivation, and abnormal bleeding caused by non-targeting. Therefore, it is crucial to effectively deliver thrombolytic agents to the site of thrombus with minimal adverse effects. Based on the long blood circulation and excellent drug-loading properties of human serum albumin (HSA), we employed genetic engineering techniques to insert a functional peptide (P-selectin binding peptide, PBP) which can target the thrombus site to the N-terminus of HSA. The fusion protein was expressed using Pichia pastoris and purified by Ni-chelating affinity chromatography. After being loaded with gold nanoparticles (Au NPs), the fusion protein formed homogeneous and stable nanoparticles (named as PBP-HSA@Au) with a diameter of 17.7 ± 1.0 nm and a zeta potential of -11.3 ± 0.2 mV. Cytotoxicity and hemolysis tests demonstrated the superb biocompatibility of PBP-HSA@Au. Platelet-targeting experiments confirmed the thrombus-targeting ability conferred by the introduction of PBP into PBP-HSA@Au. Upon near-infrared ray (NIR) irradiation, PBP-HSA@Au rapidly converted light energy into heat, thereby disrupting fibrinogen and exhibiting outstanding thrombolytic efficacy. The designed HSA fusion protein delivery system provides a precise, rapid, and drug-free treatment strategy for thrombus therapy. This system is characterized by its simple design, high biocompatibility, and strong clinical applicability. All animal experiments involved in this study were carried out under the protocols approved by the Animal Experiment Ethics Committee of Jiangnan University [JN. No20230915S0301015(423)].