A drug is composed of fragments with their functional and structural characteristics. Functional fragments contain structural elements known as pharmacophores which generate the bioactivity of the drugs, while structural fragments assemble the functional fragments into a specific skeleton also crucial for the activity. Although drug molecules possess structural diversity and complexity, the fragments usually have some similarity. They normally have simple texture, low molecular weight and log P. The aim of fragment-based drug discovery is to classify and screen the collections of fragments and subsequently expand, link, or merge them to obtain new chemical entities. This theory refines the traditional structure-based and the high throughput screen-based drug discovery strategy, and facilitates the reduction of molecular size and the improvement of drug-like properties, which will certainly increase the probability of developing new drugs. In this article, we reviewed the concept, methodology of fragment-based drug discovery and detailed a number of examples to illustrate the optimization strategies of this discovery method.

Many methods can by used for the quantitative determination of the three types of immu-noglobulin. On the basis of the single radial immuno-diffusion method used by John L. Fahey,certain modifications have been made on the methods of diluting standard solutions and theirconcentrations, and the standard concentration of the immunoglobulins and the antibody-con-taining agar diffusion plates. In order to find the optimum condition of cultivation, theeffects of various temperatures and various cultivation time given by G. Mancini et al havebeen checked, and satisfactory standard curves have been obtained. Therefore, the accuracyof the analytical results is guaranteed. According to the results obtained, there is no observable effect on the diameter of theprecipitating ring when the temperature in culture-box is 35?C to 40?C and the cultivationtime extends to 96 hrs.

Due to the complicated pathogenesis of cardiac arrhythmia, the safe and effective therapeutic strategies for cardiac arrhythmia remain an urgent medical problems in the recent years. In this paper, we introduced the research practice of anti-arrhythmic agents targeting on potassium ion channel. The research progress of anti-arrhythmic agents in up-to-date literatures were also reviewed and prospected.

Hepatitis C ; immunology ; Humans ; Killer Cells, Natural ; immunology

Objective To build a systematic,comprehensive,high efficient and maneuverable follow-up system in multi-disciplinary team(MDT).Methods Comparing with abroad follow-up practical management,the advantages and disadvantages were analyzed by using multiple follow-up forms and the construct of staffs to guide and evaluate the postoperative patients in colorectal carcinoma at the beginning of follow up system.Results Follow-up system was made rationalized,and an effective follow-up model was built up to extend in MDT.Conclusion Following up the present situation with patients of colorectal cancer in this country,the correct direction which is based on current follow-up system would be put out.That would be the important study to improve the medical treatment in next stage.

Objective To investigate the influence of atorvastatin (Lipitor) on the expression of programmed cell death 4 (PDCD4) in human CD4+T lymphocytes in vitro. Methods Human CD4+T cells obtained from healthy individuals were activated with PHA and treated with atorvastatin. The mRNA and protein expression levels of PDCD4 were detected by real-time PCR and western-blot respectively. Results The stimulation of PHA obviously increased the mRNA and protein expression of PDCD4 and the secretion of those serum cytokines. The expression of PDCD4 and the production of serum TNF-α were significantly decreased, whereas the serum levels of IL-10 were significantly increased after treated by different concentration of atorvastatin. The serum secretion of TNF-α was positive correlation with the expression of PDCD4 through the linear related analysis (r=0.782, P<0.01), and the secretion of IL-10 was negative correlation with the expression of PDCD4 (r=-0.653, P<0.05). Conclusion The anti-inflammatory effects of atorvastatin are mediated by down regulating the expression of PDCD4 in CD4+T cells.

Designing of natural product-like compounds using natural products as template structures is an important strategy for the discovery of new drugs. Gambogic acid (GA), which is a Garcinia natural product with a unique caged xanthone scaffold, inhibits potent antitumor activity both in vitro and in vivo. This review summarized the researches on the identification of the antitumor pharmacophore of GA, and the design, structural optimization and structure-activity relationship (SAR) of natural product-like caged xanthones based on it.

Objective To evaluate the clinical value of serum MUC1(sMUC1)in the patients with multiple myeloma.Methods The enzyme linked immunosorbent assay(ELISA)was used to compare the sMUC1 levels in the 12 cases of newly diagnosed multiple myeloma.15 cases of post-chemotherapy and 46 healthy donors.Results The mean concentration of sMUC1 in the newly diagnosed patients with multiple myeloma was 33.44 U/ml(10.86～88.80 U/ml).In the patients of post-chemotherapy the mean concentration was 11.6U/ml(3.92～22.22 U/ml),and in the healthy donors the concentration was 12.81 U/ml(3.84～30.45 U/ml).The level of sMUC1 in the new diagnosed patients was significandy higher than that in the patients of post-chemotherapy(P=0.001)and healthy donors(P=0.000).There was no significant difference between post-chemotherapy and healthy donors(P=0.461).Conclusion sMUC1 may be one of the tumor markers for the diagnosis of multiple myeloma.sMUC1 could also be used as one of the indicators of prognosis and the evaluation of the chemotherapy efficacy.sMUC1 might be a potential target for the immunotherapy to the patients with multiple myeloma.

Objective To explore the association between SLC2A9,SLC17A3,ABCG2 single nucleotide polymorphisms and gout susceptibility in Quanzhou.Methods One hundred and fifty-four cases of gout patients and 160 healthy controls were selected,single nucleotide polymorphisms (SNP) of SLC2A9 SLC17A3,ABCG2 with tri-primer polymerase chain reaction (PCR) were tested and the relation between different genotypes and primary gout prevalence were analyzed.Results High risk genotype frequency of rs16890979 was 93.5％ and 70.0％ in patients and healthy people,respectively (the difference of genotype frequency between the two groups was statistically significant (x2=55.377,P＜0.01).High risk allele frequency was 79.9％ and 48.4％ in patients and healthy people,respectively (allele frequency in different population was statistically significant,x2=67.128,P＜0.01).High risk genotype frequency of rs2231142 was 68.8％ and 38.7％ in patients and healthy people,respectively (the difference of the genotype frequency was statistically significant,x2=29.129,P＜0.01);High risk allele frequency was 43.5％ and 23.4％ in patients and healthy people,respectively (the difference of allele frequency was statistically significant,x2=28.468,P＜0.01) ; rs1165205was a protective SNP,low risk genotype frequency was 42.2％ and 45.6％ in patients and healthy people,respectively (the difference of genotype frequency was statistically significant,x2=0.373,P=0.571); High risk allele frequency was 26.0％ and 28.1％ in patients and healthy people,respectively (the difference of allele frequency was not statistically significant,x2=0.270,P=0.364).Conclusion SNP loci rs16890979 of SLC2A9 gene and rs2231142 of ABCG2 gene can be used as genetic markers for primary gout susceptibility in the Quanzhou area,but SNP loci rs1165205 of SLC17A3 gene has little correlation with the prevalence of primary gout in Quanzhou residents.