Pre-formulation physicochemical properties of component-based Chinese medicine of Qinqi Fengshi Fang / 中国中药杂志

Pre-formulation physicochemical properties of the component-based Chinese medicine of Qinqi Fengshi Fang were investigated to provide a research basis for the design of the dosage form for component-based Chinese medicine of Qinqi Fengshi Fang. The macroporous resin adsorption and refining technology was used to prepare the total glycosides extract of Gentianae Macrophyllae Radix, Panacis Majoris Rhizome and Corni Fructus respectively in the prescription of Qinqi Fengshi Fang. Their physicochemical properties were investigated, including solubility, wettability, hygroscopicity, equilibrium solubility, oil-water partition coefficient, and stability. The results showed that the total glycosides of Gentianae Macrophyllae Radix, Panacis Majoris Rhizome and Corni Fructus all had good solubility and wettability. The solubility index of each total glycoside component was greater than 85%, and the water absorption index was greater than 50%. In the range of pH 2.0-7.4, the equilibrium solubility of three kinds of total glycosides all increased with the increase of pH, showing a consistent change trend of solubility. The hydrophilicity was also suitable and similar. Overall, three kinds of total glycosides showed good stability, but strong hygroscopicity. The degree of hygroscopicity was as follows: total glycosides of Gen-tianae Macrophyllae Radix > total glycosides of Corni Fructus > total glycosides of Panacis Majoris Rhizome. Therefore, the hygroscopi-city needed to be considered in the preparation of the component-based Chinese medicine of Qinqi Fengshi Fang. The excipients and packaging materials can be properly selected to reduce the hygroscopicity of the preparation. This study provides a reference for the dosage form design of the component-based Chinese medicine of Qinqi Fengshi Fang.

Preliminary study on RC membrane permeability and mechanism of seven traditional Chinese medicine alkaloids such as berberine / 中国中药杂志

In order to analyze the law of membrane permeation of different alkaloids, seven traditional Chinese medicine alkaloids with different parent nucleus and substituent structures, including berberine, palmatine, sinomenine, matrine, oxymatrine, sophoridine, and tetrandrine, were prepared into the simulated solution with same molar concentration, and the membrane penetrating experiments with membrane RC1K and membrane RC5K were carried out. The dynamic transmittance, the total transmittance and the total adsorption rate of each substance were measured, and the scanning electron microscopy (SEM) images of the membrane surface before and after the membrane experiment were considered to predict and analyze the reason of differences in dynamic transmittance of different alkaloids. The results showed that there were significant differences in the dynamic transmittance of the chemical constituents of different alkaloids during penetrating the two membranes. The contamination degree on the surface of the membrane material was also different. The transmittance of the same compound through the RC5K membrane was larger than that through RC1K membrane. Within a certain range, the smaller the pore size of the membrane, the better the selective screening effect on the chemical constituents of traditional Chinese medicine. All the membrane surfaces were less polluted. The difference in transmittance between different substances on the same membrane showed a positive correlation with the difference in structural complexity, providing an experimental basis for the surface modification design in contamination control of membrane materials. In the design of membrane modified material, the surface properties of the membrane can be improved by grafting different polar groups, thereby changing the adsorption characteristics of the membrane surface. The pore size was designed accordingly to achieve the high transmittance and low pollution of the corresponding compounds.

Assessment and analysis of influencing factors of patients' satisfaction with perioperative anesthetic care / 基础医学与临床

Objective To introduce and revise the patient satisfaction with perioperative anesthetic care question-naire (PSPACq). To assess the patient satisfaction with perioperative anesthetic care and to analyse the influencing factors. Methods Translation and culture adaptation were used for PSPACq, then the questionnaire was applied to three hundred and eighty patients after selective operation. The reliability and validity of the simplified Chinese version was evaluated. To evaluate the patient satisfaction with perioperative anesthetic care and to analyse the influencing factors. Results The Cronbach's a coefficient was employed to evaluate the internal reliability, which was 0.935. The content validity index(CVI) was 0.933. The total score of patient satisfaction with perioperative anesthetic care was (4.28±0.45). The factor " discomfort and needs" had gotten the highest score(4.68±0.67), and the factor "fear" had gotten the lowest score (3.56±0.79). Patients with different characteristics had different satisfaction. Multiple regression analysis showed that marriage, previous anesthetics and anesthesia methods are the main influencing factors(P＜0.05). Conclusions Simplified Chinese version PSPACq may be used to evaluate and analyse patient's satisfaction with perioperative anesthetic care. It is possible to improve patient's satisfaction by taking effective measures depending on the influencing factors.

Study on essential oil separation from Forsythia suspensa oil-bearing water body based on vapor permeation membrane separation technology / 中国中药杂志

To investigate the feasibility of vapor permeation membrane technology in separating essential oil from oil-water extract by taking the Forsythia suspensa as an example. The polydimethylsiloxane/polyvinylidene fluoride (PDMS/PVDF) composite flat membrane and a polyvinylidene fluoride (PVDF) flat membrane was collected as the membrane material respectively. Two kinds of membrane osmotic liquids were collected by self-made vapor permeation device. The yield of essential oil separated and enriched from two kinds of membrane materials was calculated, and the microscopic changes of membrane materials were analyzed and compared. Meanwhile, gas chromatography-mass spectrometry (GC-MS) was used to compare and analyze the differences in chemical compositions of essential oil between traditional steam distillation, PVDF membrane enriched method and PDMS/PVDF membrane enriched method. The results showed that the yield of essential oil enriched by PVDF membrane was significantly higher than that of PDMS/PVDF membrane, and the GC-MS spectrum showed that the content of main compositions was higher than that of PDMS/PVDF membrane; The GC-MS spectra showed that the components of essential oil enriched by PVDF membrane were basically the same as those obtained by traditional steam distillation. The above results showed that vapor permeation membrane separation technology shall be feasible for the separation of Forsythia essential oil-bearing water body, and PVDF membrane was more suitable for separation and enrichment of Forsythia essential oil than PDMS/PVDF membrane.

Bioinformatic analysis of non-VP1 capsid protein of coxsackievirus A6 / 华中科技大学学报（医学）（英德文版）

This study bioinformatically analyzed the non-VP1 capsid proteins (VP2-VP4) of Coxasckievirus A6 (CVA6), with an attempt to predict their basic physicochemical properties, structural/functional features and linear B cell eiptopes. The online tools SubLoc, TargetP and the others from ExPASy Bioinformatics Resource Portal, and SWISS-MODEL (an online protein structure modeling server), were utilized to analyze the amino acid (AA) sequences of VP2-VP4 proteins of CVA6. Our results showed that the VP proteins of CVA6 were all of hydrophilic nature, contained phosphorylation and glycosylation sites and harbored no signal peptide sequences and acetylation sites. Except VP3, the other proteins did not have transmembrane helix structure and nuclear localization signal sequences. Random coils were the major conformation of the secondary structure of the capsid proteins. Analysis of the linear B cell epitopes by employing Bepipred showed that the average antigenic indices (AI) of individual VP proteins were all greater than 0 and the average AI of VP4 was substantially higher than that of VP2 and VP3. The VP proteins all contained a number of potential B cell epitopes and some eiptopes were located at the internal side of the viral capsid or were buried. We successfully predicted the fundamental physicochemical properties, structural/functional features and the linear B cell eiptopes and found that different VP proteins share some common features and each has its unique attributes. These findings will help us understand the pathogenicity of CVA6 and develop related vaccines and immunodiagnostic reagents.

Stability of cantharidin and cantharidic acid in Mylabris aqueous solution / 中国中药杂志

To investigate the stability and the conversion rules of cantharidin and cantharidic acid contained in the Mylabris aqueous solution under different conditions. The contents of cantharidin and cantharidic acid under different conditions (pH, temperature and light) were determined by HPLC-TQ-MS. The results showed that the content of cantharidin was gradually decreased with the rising of pH value, while on the contrary, the content of cantharidic acid was increased gradually; after Mylabris aqueous solution with different pH values were placed at 25, 40 ℃ and 25 ℃ respectively for lighting for 90 days, the samples were collected for analysis. The results showed the contents of cantharidin and cantharidic acid were changed greatly in the first 10 days, mainly including the decrease of cantharidic acid and increase of cantharidin when the solution was acidic, and the increase of cantharidic acid and decrease of cantharidin when the solution was alkaline. After that, the contents of the above two components basically remained stable. This study revealed that pH was the main factor to affect the contents of cantharidin and cantharidic acid, and they could be converted into each other with the changes of pH value. High temperature and light can accelerate the speed of achieving such balance. The study can provide certain reference for the quality control of the medicines using the Mylabris as raw material.

Immunological balance of CD8CD28/CD8CD28T lymphocytes can predict gastrointestinal hemorrhage in patients with inflammatory bowel disease / 南方医科大学学报

<p><b>OBJECTIVE</b>To evaluate the sensitivity and specificity of CD8CD28/CD8CD28T lymphocyte balance in predicting the gastrointestinal hemorrhage (GH) in patients with inflammatory bowel disease (IBD).</p><p><b>METHODS</b>Forty-nine IBD patients, including 30 with ulcerous colitis (UC) and 19 with Crohn's disease (CD), were enrolled to test peripheral blood CD8CD28and CD8CD28T cells using flow cytometry. All the patients were followed up for one year. The receiver-operating characteristic (ROC) curves were used to test the efficiency of CD8CD28/CD8CD28T lymphocyte balance to predict GH. The differences in lasting time of remission (LTR) under different factors were compared using Kaplan-Meier survival analysis, and the correlation between CD8T lymphocytes and the factors were analyzed.</p><p><b>RESULTS</b>The utilization rates of immunosuppressant, steroids, and biological agent (BA) were significantly higher in CD patients than in UC patients (P=0.003, 0.043 and 0.002, respectively). The frequencies of CD8CD28T cells were obviously higher in UC patients than those in CD patients (t=3.022, P=0.004). CD8CD28T cells, CD8CD28T cells, and especially CD8CD28/CD8CD28ratio (area under curve of 0.977, P=0.000; cut-off value of 1.14 [13.95%/12.24%] with a sensitivity of 93.3% and a specificity of 91.2%) showed good efficiencies in predicting GH (P<0.01). The mean and median of LTR of IBD patients who did not receive BA or surgical treatment were significantly longer (Χ=9.730, P=0.002; Χ=15.981, P=0.000). CD8CD28/CD8CD28ratio was significantly related to both BA (P=0.009) and surgery (P=0.038).</p><p><b>CONCLUSION</b>Both decreased CD8CD28T cells and elevated CD8CD28T cells are closely correlated with GH, and their ratio can predict the occurrence of GH with a high sensitivity and specificity and is correlated with BA and surgery at the cut-off value of 1.14.</p>

Expression and significance of toll-like receptors 7 and 8 in brain and lung tissues of death cases caused by EV71 infection / 中国当代儿科杂志

<p><b>OBJECTIVE</b>To study the significance of toll-like receptors (TLR) -7 and -8 in the pathogenesis of infection caused by Enterovirus type 71 (EV71) through measuring the expression of TLR7 and TLR8 in brain and lung tissues from the death cases caused by EV71 infection.</p><p><b>METHODS</b>Nine children who died of EV71 infection (EV71 group) were selected as study subjects, and 7 children who died of accidents or non-infectious diseases were used as the control group. Brain and lung tissues from the death cases in both groups at autopsy were collected, and immunohistochemistry was applied to detect the expression of TLR7 and TLR8 in lung and brain tissues in both groups. Integrated optical density (IOD) was applied for semi-quantitative analysis of the expression of TLR7 and TLR8.</p><p><b>RESULTS</b>Immunohistochemical results showed that the expression of TLR7 and TLR8 in lung and brain tissues was strongly positive in the EV71 group, and the IOD values in the EV71 group were also significantly higher than those in the control group (P<0.05). There was no significant difference in the expression of TLR7 and TLR8 between lung and brain tissues in the EV71 group (P>0.05).</p><p><b>CONCLUSIONS</b>TLR7 and TLR8 are highly expressed in lung and brain tissues from the patients who die of severe EV71 infection, suggesting that TLR7 and TLR8 may be involved in the pathogenesis of brain and lung damages caused by severe EV71 infection.</p>

Residue decline dynamics and safety utilization of carbendazim in cultivation of Anoectochilus roxburghii / 中国中药杂志

The paper aimed to study the residue decline dynamic and standards for safety utilization of carbendazim in roots, stems, leaves of Anoectochilus roxburghii and in growth media. Samples extracted with methanol were purified by liquid-liquid extraction and analysed by HPLC. The results showed that average rate of recovery was 82.9% - 95.7% and RSD were 2.0% - 6.3% with add of carbendazim in respectively diverse concentration, which meets inspection requirement of pesticide residue. Two kinds of dosages of carbendazim were treated, varying from recommended dosage (1.0 kg x hm(-2)) to 1.5 times recommended dosage (1.5 kg x hm(-2)). Results of two years test showed that the half-life period of carbendazim were 7.01 - 8.51 d in the growth media of A. roxburghii, 3.58 - 4.27 d in stems and 3.50 - 3.91 d in leaves, 4.93 - 5.71 d in roots. Providing max recommended residue of carbendazim in the cultivation of A. roxburghii is 0.5 mg x kg(-1), sprayed 4 times a year with the dosage of 1.0 kg x hm(-2), 28 days is proposed for the safety interval of the last pesticide application's and harvest's date.

Biological characteristics of Fusarium oxysporum and inhibitory effects of five fungicides / 中国中药杂志

The mycelium growth and sporulation in different temperature, pH value and light conditions were detected by using the crossing and haemocytometer method. The toxicity of five fungicides to Fusarium oxysporum was tested by mycelia growth method, so as to provide the reference for prevention and control against F. oxysporum. The optimum temperature and pH value of F. oxysporum to grow and spore were 28 degrees C and 6-7. Alternating light and darkness promoted growth and sporulation of bacterial colony. As for five fungicides, the EC50 of tebuconazole was 10.02 mg x L(-1), 92.50 times as much as carbendazim. The EC50 of myclobutanil and Fuxing was 91.23, 96.68 mg x L(-1), respectively. Tebuconazole showed the most tremendous inhibitory effect and control efficiency on F. oxysporum.

Studies on methods of in vitro evaluation of soft rot-resistance in jinxianlian / 中国中药杂志

Compared with living spray method, it focused on the investigation of different inoculation methods, various inoculation concentration and the influence of different seeding age on soft rot-resistance in Jinxianlian. The results showed that (1) Inoculated with dropping connection, the difference of disease index between A. roxburghii and A. formosanus was grate, so that the disease-resistance could be obviously distinguished. (2) When the inoculation concentration was 1.0 x 10(7) cfu x mL(-1), the difference of disease index was relatively obvious and the disease-resistance could be differentiated well. (3) At the moment of 4-month seeding inoculation, a certain difference of the disease index between A. roxburghii and A. formosanus was existed, so, relatively, it could accurately reflect the resistance difference between various species. With the inoculation of dropping connection, A. roxburghii and A. formosanus of 4-month seeding age was put in the bacteria suspension of inoculation concentration of 1.0 x 10(7) cfu x mL(-1). The identification was taken up after 5 days in the incubator under the condition of 14 h daylight and 28 degrees C. The identification result was conformed with that of the living spray method. To investigate the identification method of in vitro evaluation of soft rot-resistance of Jinxianlian so as to provide the foundation for germplasm utilization and excellent cultivars breeding.

Determination of five pyrethroid pesticides residues in Anoectochilus roxburghii by cloud point extraction-back extraction and GC-MS / 中国中药杂志

A method for residual determination of 5 pyrethroid pesticides in Anoectochilus roxburghii by cloud point extraction-back extraction-GC-MS was established. PEG 6000 was used as extraction agent and isooctane was used for back-extractant. The con- tent was calculated by external standard method. The linear range was from 15 to 2 000 μg x kg(-1) with the good correlation coefficients (0.955-0.999). The recoveries at spiked concentrations of 50-500 μg x kg(-1) ranged from 85.12% to 101.6%. The limit of detection and quantification of 5 pyrethroid pesticides were in the range of 0.63-3.10 μg x kg(-1) and 2.10-10.31 μg x kg(-1), respectively. The proposed method can be applied to the determination of pyrethroid pesticides residues in A. roxburghii.

Comparative study on four membrane modules in membrane filtration process of Huanglian Jiedu decoction / 中国中药杂志

<p><b>OBJECTIVE</b>To compare the membrane filtration process of four membrane modules namely, FMX rotating disk flat membrane module, hollow fiber membrane module, tubular membrane module and filter cup membrane module, with traditional Chinese medicine compound Huanglian Jiedu decoction as the experimental subject.</p><p><b>METHOD</b>Under the same experimental operating conditions, the four membrane modules in membrane filtration process of Huanglian Jiedu decoction were compared in terms flux, resistance distribution, transmittance of index components and membrane fouling.</p><p><b>RESULT AND CONCLUSION</b>Three membrane modules in the dynamic filtration form--FMX rotating disk flat membrane module, hollow fiber membrane module and tubular membrane module had more advantages than filter cup membrane module in the static dead-end filtration form in terms of permeate flux, transmittance of index components and membrane fouling. However, FMX membrane module that made the fluid in a strong vortex status had better performance than hollow fiber membrane and tubular membrane module in permeate flux and membrane fouling.</p>

Effect of Xinjikang on left ventricular hypertrophy remodeling in hypertensive rats

OBJECTIVE@#To investigate the effects of Xinjikang on the left ventricular hypertrophy remodeling and myocardial activity in hypertension.@*METHODS@#Sixty Wistar rats were randomly divided into four groups. The pressure-loaded left ventricular hypertrophy model was established with abdominal aorta ligation method. Rats in A and B groups were intragastrically administered with physiological saline, while C and D groups were administered with Xinjikang and metoprolol, respectively. The changes in blood pressure, E/A ratio, myocardial pathological morphology, myocardial lipoperoxides and superoxide dismustase activity in four groups were observed and compared before and after treatment.@*RESULTS@#There were statistically significant differences in E/A ratio between C group after treatment and model group (P0.05); after treatment the myocardial lipoperoxides and superoxide dismustase contents in C and D groups were improved significantly compared with model group (P<0.05).@*CONCLUSIONS@#Xinjikang can improve myocardial injury, restore myocardial parenchyma and myocardial interstitial remodeling functions in hypertensive rats with the left ventricular hypertrophy.

Correlation analysis between plasma D-dimer levels and orthopedic trauma severity / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>The correlation between the plasma D-dimer level and deep vein thrombosis has not been conclusive in various studies. The aim of this research was to study the relationship between plasma D-dimer levels and the severity of orthopedic trauma by retrospective examination of orthopedic trauma cases.</p><p><b>METHODS</b>Clinically acute trauma and non-acute trauma patients were selected and their plasma D-dimer levels were measured. Plasma D-dimer levels in patients of these two groups were compared. The relationship between the plasma D-dimer level and the severity of the trauma was also studied.</p><p><b>RESULTS</b>There were 548 cases in the acute trauma group and 501 cases in the non-acute trauma group. The levels of plasma D-dimer were significantly higher in the acute trauma group than in the non-acute trauma group (P < 0.01). In the acute trauma group, the correlation between the D-dimer level and the number of fractures was a positive linear correlation (r = 0.9532).</p><p><b>CONCLUSIONS</b>Elevated plasma D-dimer is common in trauma patients. The D-dimer level and the number of fractures in the trauma patients are closely correlated. D-dimer is not only an indicator for the diagnosis of deep vein thrombosis and pulmonary embolus, but also an indicator of the severity of trauma in acute trauma patients.</p>

Huangqin decoction lowers the number of mast cells in ulcerative colitis in rats with dampness and heat syndrome / 南方医科大学学报

<p><b>OBJECTIVE</b>To explore the role of mast cells in the pathogenesis of ulcerative colitis in rats with dampness and heat syndrome, and observe the regulatory effect of Huangqin decoction on the mast cells.</p><p><b>METHODS</b>Rat models of dampness and heat syndrome were established by feeding with high-fat and-sugar chow, maintenance of a hot and humid environment, and intrarectal administration of 2,4,6-trinitro-benzene-sulfonic acid. The model rats were then randomized into the model group (n=12), Huangqin decoction group (n=13) and mesalazine group (n=12). After a one-week treatment, the inflammatory cell infiltration was observed using HE staining, and the number of mast cells was determined using toluidine blue staining. Immunohistochemistry was used to detect the expression of tryptase, and serum IL-4 and IL-6 levels were measured using ELISA.</p><p><b>RESULTS</b>Compared with the normal control rats (n=15), the rats in the model group showed obvious inflammatory cell infiltration at the lesion site with significantly increased mast cells and serum IL-6 level (P<0.05). Huangqin and mesalazine significantly lessened inflammatory cell infiltration and decreased the mast cell number and serum IL-6 level after a one-week treatment.</p><p><b>CONCLUSION</b>The intestinal mucosal immune cells such as the mast cells play an important role in the pathogenesis of ulcerative colitis associated with dampness and heat syndrome. Huangqin decoction can ameliorate the inflammation, decrease mast cell number and tryptase release, and inhibit IL-6 secretion for treatment of ulcerative colitis in rats with dampness and heat syndrome.</p>

The roles of CD4+CD25+ T regulatory cells and Foxp3 mRNA expression in the subjects with and without responses to hepatitis B virus vaccination / 中华肝脏病杂志

<p><b>OBJECTIVES</b>To investigate the internal links between immune responses and Tregs and cytokine by the expression of T regulatory cells (Tregs), Foxp3 mRNA of different response groups and the detection of cytokine secretion after hepatitis B vaccination.</p><p><b>METHODS</b>Blood samples were collected in different response groups. Real-time fluorescence quantitative PCR was used to detect the expression of Foxp3 mRNA of peripheral blood mononuclear cells; The surface markers CD4 and CD25 in peripheral-blood mononuclear cells were determined by flow cytometry; ELISA tests were used to detect the production level of phytohemagglutinin (PHA) in peripheral blood mononuclear cells, IL -4, IL-12, IL-18 stimulated by HBsAg and (IFN) gamma.</p><p><b>RESULTS</b>(1) Foxp3 expressions in response group and non-response group were higher before or after PHA and HBsAg were stimulated. Differences were statistically significant (P value less than 0.05) ; (2) In peripheral blood, the percentage of CD4+CD25+ Treg of CD4+ T cells in response group (0.59%+/-0.46%) was obviously lower than those in control group (1.30%+/-1.44%) ; (3) Peripheral blood mononuclear cells stimulated by PHA and HbsAg in each group, the concentration of IFNgamma in non-response group [(11.00+/-9.03) IU/ml] was markedly lower than those in response group [(38.88+/-28.16) IU/ml],and differences were statistically significant (P value less than 0.01); (4) In PHA- or HBsAg-stimulated peripheral-blood mononuclear cells, the concentrations of IL-18, IL-4 and IL-12 had no significant difference.</p><p><b>CONCLUSIONS</b>To some extent, CD4+CD25+Foxp3+ Treg cells may be involved in negative regulation of the immune responses to HBV vaccination. Immune non-response to HBV vaccination may be connected to insufficient secretion of IFNgamma; There was no correlation between the titer of anti-HBs and the expressions of IFNgamma and CD4+CD25+ Foxp3.</p>

Effect of HMGB1-siRNA on proliferation and apoptosis of HepG2 cells / 中华肝脏病杂志

<p><b>OBJECTIVE</b>To investigate the effect of decreased expression of high mobility group Box-1 on the proliferation and apoptosis of HepG2 cells.</p><p><b>METHODS</b>Three specific siRNAs of HMGB1 were designed and synthesized, and were transiently transfected into HepG2 cells by Lipofectamine 2000. The HMGB1 expression in HepG2 cells was detected by RT-PCR and Western blotting respectively. The proliferation activity in vitro was assessed by MTT assay. In situ apoptosis was evaluated by terminal deoxynucleotidyl transferase-deoxyuridine triphosphate nick end labeling (TUNEL) assay.</p><p><b>RESULTS</b>All of these specific HMGB1-siRNAs (1, 2, 3) efficiently and specifically inhibited the expression of the HMGB1 gene, and the levels of HMGB1 mRNA were 1.147+/-0.024, 1.014+/-0.042, 0.435+/-0.055, respectively, in HMGB1-siRNAs transfection group, which were significantly lower than that in Lipofectamine 2000 alone group (1.411+/-0.065, P < 0.01). Correspondingly, all of these specific HMGB1-siRNAs (1, 2, 3) could efficiently and specifically inhibit the expression of the HMGB1 protein, and the levels of HMGB1 protein were 0.369+/-0.035, 0.340+/-0.028, 0.097+/-0.020, respectively, in HMGB1-siRNAs transfection group, which were significantly lower than that in Lipofectamine 2000 alone group (0.553+/-0.051, P < 0.01). Of the 3 specific HMGB1-siRNAs, HMGB1-siRNA-3 (siRNAH3) had the highest inhibition rate (80%). The proliferation of HepG2 cells was markedly inhibited by siRNAH3 transfection. Compared to mock-transfection, siRNAH3 transfection dramatically suppressed the proliferation of HepG2 cells (P < 0.01). Moreover, siRNAH3 can induce apoptosis (P < 0.01).</p><p><b>CONCLUSION</b>siRNA targeting HMGB1 mRNA can specifically reduce HMGB1 gene and protein expression. siRNAH3 can effectively suppress the proliferation and induce apoptosis of HepG2 cells.</p>

Sequence and promoter efficacy analysis of avian leukosis virus subgroup J strains of different pathotypes / 病毒学报

To characterize the long terminal repeat (LTR) of the ALV-J strain which can induce hemangioma, fragments of provirus LTR of the three different ALV-J strains SCAU-HN06, NX0101 and JS-nt were amplified with a pair of specific primers, then cloned and subjected to sequence analysis. In comparison with the prototype ALV-J strains HPRS-103 and ADOL-7501, the LTRs of domestic strains (SCAU-HN06, NX0101, JS-nt and SD07lk1) had an 88.0%-97.2% nucleotide sequence identity; the U5 and R regions in the LTR had a high nucleotide similarity, while the U3 region in the LTR showed significant variance. The LTR fragments from the different ALV-J strains were inserted into the upstream of bacterial CAT gene of the plasmid pCAT-Basic, respectively. The resultant recombinant plasmids were transfected into DF-1 cells. The transfected cells were harvested 48 h post-transfection, and cell lysates were prepared for CAT expression detection. The CAT assay was performed using CAT-ELISA. The results showed that the promoter activity of the LTRSCAU-HNO6 was a little higher than those of LTRJS-nt and LTRNX0101, but there was no significant difference in the promoter activity among the compared LTRs.

5-Aza-CdR regulates the expression of RASSF1A gene in human gastric cancer cell line and inhibits the growth of cells / 中华胃肠外科杂志

<p><b>OBJECTIVE</b>To investigate the effect of demethylating agent 5-Aza-CdR (5-aza-2'- deoxycytidine) on demethylation and transcription-regulating of RASSF1A gene in gastric cancer cell SGC7901 in vitro, as well as on the growth inhibition of cells.</p><p><b>METHODS</b>After SGC7901 cells were treated with 5-Aza-CdR, MTT assay, flow cytometry, and Annexin V-FITC staining were performed to analyze the cell proliferation, cell cycle and apoptotic rate respectively. Methylation- specific PCP (MSP), RT-PCR and Western blotting were used to detect methylation state, expression of mRNA and protein of RASSF1A gene.</p><p><b>RESULTS</b>After SGC7901 cells were treated with different concentrations of 5-Aza-CdR, the cell growth was inhibited(P<0.05), the cell cycle was blocked at G(1) phase, and the apoptotic rate increased significantly(P<0.05). Hypermethylation was detected in the promoter region of RASSF1A gene in SGC7901 cells, and no expression of RASSF1A mRNA and protein was found. After treated with 5-Aza-CdR, demethylation occurred in RASSF1A gene,which subsequently induced re-expression of this gene at both mRNA and protein level.</p><p><b>CONCLUSION</b>Demethylating agent 5-Aza-CdR can regulate demethylation and re-expression of RASSF1A gene in gastric cancer cell SGC7901,and inhibit its growth.</p>