Time-dependent injury of mouse cerebral cortex and hippocampus by acute hypoxia / 生理学报

The aim of this study was to investigate the harmful effects of acute hypoxia on mouse cerebral cortex and hippocampus and the underlying mechanism. Mouse model of acute hypoxia was constructed by using a sealed glass jar. Laser speckle contrast imaging was used to detect the changes of cerebral blood flow after different time duration of hypoxia. Total superoxide dismutase (T-SOD) and malondialdehyde (MDA) assay kits were used to detect oxidative stress in cerebral cortex and hippocampus. Immunofluorescent staining was used to detect neuroinflammatory response of microglia in the cerebral cortex and hippocampus. One-step TUNEL method was used to detect neuronal apoptosis. The results showed that, compared with non-hypoxia (0 min hypoxia) group, 30 min hypoxia group exhibited decreased cerebral blood flow, higher percentage of CD68+/Iba1+ microglia, and increased neural apoptosis in the cerebral cortex and hippocampus. Compared with 30 min group, 60 min hypoxia group showed significantly decreased cerebral blood flow, increased MDA content in the cortex, as well as greater percentage of CD68+/Iba1+ microglia and neuronal apoptosis in the cerebral cortex and hippocampus. These results suggest that acute hypoxia damages brain tissue in a time-dependent manner and the oxidative stress and neuroinflammation are important mechanisms.

The current progress in the development of HIV-1 fusion inhibitors / 药学学报

HIV-1 fusion inhibitors are a new class of anti-HIV compounds, which block the entry of HIV into target cells through preventing the fusion between viral and cell plasma membrane and thus interrupt the initial steps of viral replication. T-20 (enfuvirtide), which has been clinically approved as the first fusion inhibitor of HIV-1 by U.S. FDA in 2003, can suppress replication of HIV variants with multi-drug resistance to reverse transcriptase and protease inhibitors. Peptides and small molecules display potent anti-HIV fusion activities by targeting gp41 thus inhibit its fusogenic function. In recent years, with the development of studies on the molecular mechanism of HIV membrane fusion process and the function of gp41, many new fusion inhibitors are found and some have been in advanced clinical trials. This review discusses recent progress in the development of HIV-1 fusion inhibitors targeting the gp41.

The preliminary analysis of the recognition epitopes of anti-HEV monoclonal antibodies on HEV ORF2 / 病毒学报

Western blot, capture-PCR, blocking ELISA and synthetic polypeptides were used to systematically study the recognition epitopes on HEV ORF2 of 23 anti-HEV monoclonal antibodies(McAbs) which were previously generated in our laboratory directed against HEV ORF2. Results showed that seven McAbs recognized linear epitopes that located at aa408-458 of HEV ORF2 and 16 conformation-dependent McAbs, most of which recognized the surface epitopes of native HEV, located at aa459-606 of HEV ORF2. The systematical study of the recognition epitopes of anti-HEV McAbs on HEV ORF2 provides important information for the investigation of virus receptor and HEV infection mechanism, as well as its vaccine and diagnostics development.

Isolation and purification of 10-hydroxycamptothecin and vincoside-lactam from Camptotheca acuminata seed by polyamide / 中国中药杂志

To investigate the technological parameters of the isolation and purification of 10-hydroxycamptothecin and vincoside-lactam from Camptotheca acuminata seed by polyamide. The static arid dynamic adsorption characteristics of 10-hydroxycamptothecin and vincoside-lactam on polyamide were studied, and the contents were determined by HPLC. The optimum parameters for adsorption were as follows: the contents of 10-hydroxycamptothecin and vincoside-lactam in the extracts were 0.189 g x L(-1) and 0.334 g x L(-1), respectively, pH 6, flow rate was 1.0 mL x min(-1), processing volume was 3 BV; for desorption: ethanol-water (60:40), flow rate was 1.0 mL x min(-1), 5 BV as an eluent. After treated with polyamide, the contents of 10-hydroxycamptothecin and vincoside-lactam were 17.52% and 32.87%, respectively, the recovery yields were 66.05% and 75.86%, respectively. Results showed that polyamide revealed a good ability to separate 10-hydroxycamptothecin and vincoside-lactam. Therefore, we concluded that results in this study may provide scientific references for the large-scale production of 10-hydroxycamptothecin and vincoside-lactam extracted from C. acuminata seed.

The molecular differences between genotype 1 and genotype 4 of HEV in their neutralization region / 病毒学报

HEV is classified into H (human) group and Z (zoonosis) group according to its compatible host. H group contains genotype 1 and genotype 2 HEV isolates which infect human only; Z group contains genotype 3 and genotype 4 HEV isolates which infect both human and animals. After analysis of amino acid sequences between ORF2 aa368 and aa606, four group-conserved sites that were all located in the neutralization region of ORF2 were identified. They are aa483, aa492, aa497 and aa599. Mutation analysis and capture PCR were then performed on these sites with a group of monoclonal antibodies. Results showed that the difference of the aa497 between H and Z groups was responsible for the maintenance of their group-specific immunodominant epitopes, probably through confirmation-dependent epitope changes. Thus, aa497 and its related change on the surface structure of HEV may play important roles in host selection by H and Z groups of HEV.

Color Doppler in differential diagnosis of scrotal mass / 中华男科学杂志

<p><b>OBJECTIVE</b>To evaluate the differential diagnosis of scrotal mass with color Doppler ultrasound.</p><p><b>METHODS</b>Retrospective analysis was made of 21 cases of scrotal mass confirmed both surgically and pathologically in our hospital.</p><p><b>RESULTS</b>Eight of the total number were malignancy of the testis origin, accounting for 38.1% of whole study group and 13 were benign, accounting for 61.9%. Of the 13 benign cases, only 2 were of the testis origin (15.4%) while the other 11 (84.6%) were not.</p><p><b>CONCLUSION</b>Color Doppler ultrasound plays an increasingly important role in the differential diagnosis of scrotal mass.</p>

Study on interventing effect of puerarin on insulin resistance in patients with coronary heart disease / 中国中西医结合杂志

<p><b>OBJECTIVE</b>To explore the effect of puerarin in improving the insulin resistance (IR) and its closely related abnormal lipid and fibrinolytic activity in patients with coronary heart disease (CHD).</p><p><b>METHODS</b>Seventy-six patients with CHD were randomly divided into two groups, 40 in the puerarin group and 36 in the routine treated group. Puerarin 500 mg was given to the former in addition to routine therapy by adding to 250 ml of normal saline for intravenous dripping once a day with a therapeutic course of 3 weeks. The changes of fasting blood glucose (FBG), fasting plasma insulin (FINS), plasma total cholesterol (TC), triglyceride (TG), low and high density lipoprotein cholesterol (LDL-C & HDL-C) and plasminogen activator inhibitor-1 (PAI-1) activity were measured before and after treatment, and the insulin sensitivity index (ISI) calculated. At the same time, tissue plasminogen activator (tPA) activity before and during venous occlusion test (VOT) was tested. Besides, 30 healthy subjects were taken as control.</p><p><b>RESULTS</b>In CHD patients, FINS, TC, TG, LDL-C and PAI-1 levels were higher and ISI, HDL-C and tPA before and during VOT were lower than those in the healthy controls. FINS and ISI correlated well with lipids and fibrinolytic abnormality. After puerarin treatment, FINS level lowered and ISI increased significantly (P < 0.01), while comparing with the routine group, TC, TG, LDL-C and PAI-1 were lower but HDL-C and tPA activity before and during VOT were higher in the puerarin group (P < 0.05, P < 0.01). Correlation analysis showed that FINS was positively correlated with TC, TG, LDL-C and PAI-1 and negatively correlated with HDL-C, tPA before and during VOT; ISI was negatively correlated with TC, TG, LDL-C and PAI-1 and positively correlated with HDL-C and tPA before and during VOT in the puerarin group.</p><p><b>CONCLUSION</b>Puerarin could improve the IR, IR related lipid and fibrinolytic activity abnormality in CHD patients.</p>