Objective To establish a method for the determination of methyl tertiary butyl ether (MTBE) in the cerebrospinal fluid of rats by gas chromatography and to know whether MTBE can penetrate the blood brain barrier. Methods 9 male SD rats were randomly divided into 3 groups and then exposed to MTBE by gavage at a dose of 1000 mg/kg?bw and by inhalation at a dose of 8 ml/L for 30 days. The cerebrospinal fluid was collected at 6 h, 12 h and 24 h respectively at the end of treatment and the MTBE in rats cerebrospinal fluid was determined by gas chromatography. Results MTBE was detected in the cerebrospinal fluid of rats after subchronic exposure of MTBE through gavage and inhalation. Conclusion MTBE is able to penetrate the blood brain barrier and reach the brain.

Objective To establish a rapid method having great capability for enrichment and anti-interference, higher sensitivity and good precision for determination of trace silver in drinking water. Methods The conditions of determination such as the definition of peak potentials, the selection of auxiliary electrolytes, the selection of kind and amount of oxidants and anti-interference test were carried out by MP-1 potentiometer using glass-carbon electrode. Results The lowest detection limit, average recorery rate and average relative standard deviation were 0.004 ug/ml, 100.3% and 2.73% respectively. Conclusion This method was suitable for determination of trace silver in drinking water.

Objective: To evaluate the clinical efficacy of sinew-regulating bone-setting manipulations plus exercise therapy in treating chronic non-specific low back pain (CNLBP). Methods: A total of 65 CNLBP patients were divided into two groups by the random number table method. Thirty-three cases in the treatment group were intervened by sinew-regulating bone-setting manipulations plus exercise therapy; 32 cases in the control group were intervened by medium-frequency electrotherapy plus exercise therapy. Before and after treatment, visual analog scale (VAS), dynamic and static muscle endurance of low back, median frequency (MF) of surface electromyography (sEMG) and Oswestry disability index (ODI) were used to evaluate the low back function. The therapeutic efficacy was estimated after treatment. Results: The two groups each had 2 dropouts during the study. The total effective rate was 90.3％ in the treatment group versus 66.7％ in the control group, and the between-group difference was statistically significant (P<0.05). After treatment, the VAS score, dynamic and static muscle endurance of low back, MF of sEMG and ODI score all changed significantly in both groups (all P<0.05); all the items in the treatment group were significantly different from those in the control group (all P<0.05). Conclusion: Sinew-regulating bone-setting manipulations plus exercise therapy can effectively release pain in CNLBP patients, increase muscle endurance of the low back and improve the quality of life, and its therapeutic efficacy is more significant than that of medium-frequency electrotherapy plus exercise therapy.

OBJECTIVETo observe the effects of electroacupuncture (EA) on circadian rhythm of temperature and melatonin (MT) in depression rats model induced by chronic stress, so as to explore the biological mechanism of EA for depression.

METHODSTwenty-four SD rats were randomly divided into a control group, a model group and an EA group, 8 cases in each one. Rats in the control group were treated with normal diet for 21 days without any treatment. In the model and EA group, rat model was established by chronic unpredictable stress combined with solitarily feeding method, and rats in the EA group was treated with EA at "Baihui" (GV 20), "Yintang" (GV 29) 1 h before stress stimulation everyday, 2 Hz in frequency and intensity was favorable with the head of rat slightly shivering. The needles were retained for 20 min, once a day for totally 21 days. After EA treatment, open-field experiment was adopted to observe the behavioral improvement; the rats temperatures were monitored at six time points (2:00, 6:00, 10:00, 14:00, 18:00, 22:00) and orbital blood sampling was collected. The level of serum MT was tested by enzyme linked immunosorbent assay. The circadian rhythm changes of temperature and serum MT in each group were compared.

RESULTSThe numbers of horizontal movement and vertical movement in the model group were obviously lower than those in the control group (both P < 0.05), while those in the EA group were significantly improved compared with those in the model group (both P < 0.01). The circadian rhythm of temperature and MT disappeared in the model group, which was improved into normal level after EA treatment.

CONCLUSIONThe electroacupuncture has regulation effects on circadian rhythm of temperature and melatonin in depression rat model induced by chronic stress.

Animals ; Circadian Rhythm ; Depression ; metabolism ; physiopathology ; therapy ; Electroacupuncture ; Humans ; Male ; Melatonin ; metabolism ; Rats ; Rats, Sprague-Dawley

Air ; analysis ; Hydrogen Peroxide ; analysis ; Spectrophotometry ; methods ; Workplace

Objective To investigate stilbene glycosides(TSG) and PNS concomitantly on PC12 cell survival rate of Alzheimer's disease.Methods The nerve cells that were seeded on the two culture plates were cultured for 1 day after the removal of primary culture fluid.In addition to the blank group, the model group and drug compatibility group were added 5 μl Aβ25-35 perpore to induced PC12 cell damage.To established AD cell damage model after exposure to the circumstances for 24 hours.Uniform design and factorial design were used respectively.After 1 d, using MTT method in ELISA analyzer measured the OD value of each pore, and calculating the survival rate of cells.Results The uniform design results showed that the cell survival rate was significantly linear with TSG and PNS (P＜0.05).From the equation, The higher the dose, the higher the cell survival rate.In this experimental condition, TSG and PNS respectively 50 mg/L, 200 mmol/L achieved the highest cell survival rate.2×2 factorial design experiments showed that, compared with the model group, the cell survival rate of TSG-PNS group (74.46％ ± 2.06％ vs.65.42％ ± 1.42％) increased (P＜0.05), but there was no interaction between the two groups (P=0.053).This showed that the combination of the two drugs in this dose has a protective effect on AD damage.Conclusion The compatibility of total saponins of two stilbene glucoside and three seven combination has the synergistic effect of anti AD damage.

Male infertility is a worldwide problem, and about 15% of the cases are associated with spermatogenesis-related gene mutation. The mammalian gene UBE2B is the homolog of the RAD6 gene of yeast, belonging to the ubiquitin proteasome system and playing an important role in spermatogenesis. Mice lacking the UBE2B gene are infertile, with reduced sperm motility, increased morphologically abnormal sperm, and inhibited meiosis of spermatogonia. Accumulated evidence shows that UBE2B gene mutants and single nucleotide polymorphisms are associated with male infertility. This article reviews the relation between the UBE2B gene and male infertility, offering some theoretical evidence for the diagnosis and treatment of male infertility.
Animals ; Asthenozoospermia ; genetics ; Humans ; Infertility, Male ; genetics ; Male ; Meiosis ; Mice ; Mutation ; Polymorphism, Single Nucleotide ; Spermatogenesis ; genetics ; Ubiquitin-Conjugating Enzymes ; genetics

Objective To study the effect of vascular endothelial growth factor (VEGF) containing fibrin glue(FG) on re-endotheliazation, cell proliferation and intimal hyperplasia in a canine model of carotid artery endothelium injury. MethodsThe effect of FG/VEGF/heparin versus FG alone treatment was evaluated at the time point of 10, 30, and 90 days by measuring the intima/media (I/M) ratio and cell proliferation by BrdU incorporation using immunohistochemistry. EC coverage was determined by SEM. ResultsCompared with normal saline control, FG/VEGF/heparin treatment significantly increased EC coverage at day 10 and at day 30 (P

Objective Through the design of comprehensive experiments, the precise medical philo-sophy was put into the medical molecular biology experimental teaching, and to explore its effect. Methods Eight-year medical students of Grade 2012 and Grade 2013 in the Fourth Military Medical University were chosen as the teaching subjects. Experimental group consisted of 36 students of Grade 2013, while control group consisted of 30 students of Grade 2012. Precision medicine-based learning was applied in experimental group while traditional learning method was adopted by the control group. At the end of the course, students of two groups were implemented theoretical and experimental skills assessment; through questionnaire students were required to evaluate the effect of teaching methods and the number of two groups of students who asked questions after class greater than or equal to 1 times was counted to evaluate the students' learning enthusiasm. SPSS 15.0 software was used to make t test and Chi-square analysis for the data of the students. Results The assessment results showed that the experimental group was better than control group, especially in the section of comprehensive experimental design [(16.7 ± 2.04) vs. (13.9 ± 2.87), P=0.000]. The results from questionnaire showed that the satisfaction degree of experimental group was also higher than that of control group in many respects, including learning interests, innovation capability, knowledge mastery, cognition of precision medicine and clinical research, satisfaction with the teaching method (P<0.05). And students' learning enthusiasm and the proportion of the number of students asking questions in the experimental group were higher than the control group (P=0.000). Conclusions Precision medicine-based learning not only changes the situation of slavish imitation and passive acceptance in traditional learning, but also arouses students' interest in study and helps students to cultivate clinical thinking, which is com-mensurate to the characteristics of precision-medicine era.

Using a H₂O₂-induced BRL cell senescence model, we investigated the anti-aging effects of drug-containing serums of Erzhi Wan (EZW) and various polar extracts (petroleum ether, ethyl acetate, n-butanol, water, and iridoid glycoside-enriched fractions). Cell viability was detected by MTT assay. Cell senescence was evaluated with β-galactosidase staining assay. Intracellular reactive oxygen species (ROS) were measured by flow cytometry. UFLC-Q-TOF-MS/MS was used to identify chemical components in EZW and the extracts, and molecular docking technology was used to predict the anti-aging components of EZW. Results showed that treatment of cells with 600 μmol·L^-1 H₂O₂ for 72 h markedly induced cell senescence, inhibited cell proliferation and increased intracellular β-galactosidase activity and ROS levels. If cells were pretreated with drug-containing serum of EZW this induction of senescence was decreased. A total of 49 chemical compounds were identified in EZW by liquid chromatography-mass spectrometry, 14 of these were identified by molecular docking as potential active ingredients. Based on these analyses, and the in vitro experiments with polar extracts, we conclude that the anti-aging components of EZW are triterpenes, flavonoids and phenyl alcohols, providing a basis for further elucidation of the active agents and mechanism of the anti-aging effect of EZW.