Application of latent class analysis in online emotion regulation in college students / 中国心理卫生杂志

Objective:To explore the relationship between the latent classes of online emotion regulation among college students and the distribution difference of different types on variables such as gender,grade,ages of surfing the net and so on.Methods:Totally 421 college students were assessed with Online Emotion Regulation Questionnaire (OERQ).Latent class analysis was used to identify online emotion regulation classes,and then analyzed the distribution of latent classes among different genders,grades and ages of surfing the net.Results:Two latent classes of online emotion regulation were identified,including online emotion inhibiting/ignoring class (37.6％) and online emotion venting class (62.4％).The prevalence of online emotion venting class among girls (56.6％ vs.3.8％),sophomores (36.3％ vs.11.9％),juniors (23.4％ vs.3.1％),those with more than 36 months of surfing the net (31.6％ vs.18.8％) were significantly higher than the other of the respective kind.Whereas,the rate of inhibiting/ignoring class among boys (32％ vs.7.6％),freshmen (20％ vs.5％) were significantly higher.Conclusion:It suggests that online emotion regulation could be divided into two different latent classes and prevalence of each class is significantly different in different genders,grades,and ages of surfing the net.

Optimization of tri-expression of human CYP3A4 with POR and cyt b5 in Sf 9 cells / 浙江大学学报·医学版

<p><b>OBJECTIVE</b>To investigate the optimal conditions of tri-expression of CYP3A4, POR and cyt b5 in Sf 9 cells.</p><p><b>METHODS</b>The Sf 9 cells expressing CYP3A4, POR and cyt b5 were cultured in shaker flasks. The optimized conditions, including the temperature and rotation speed, the culture volume, the amount of surfactant and the culture time were studied. The expressed products in microsomes were used to metabolize the testosterone and their metabolic activity was determined.</p><p><b>RESULTS</b>When the temperature and rotation speed of the shaker were 27 degree and 90 r/min, the cell density and culture volume were 5X105 cells/ml and 80-120 ml per 250 ml shaker flasks, respectively. When Pluronic F-68 was 0.1% and the culture time was 72 h, the condition was most suitable for culture of Sf 9 cells and expression of targeted proteins. When the ratio of the volume of three added viruses was 1:1:1, the expression condition was optimal, under which the Km, Vmax, and CLint for testosterone metabolism were 119.6 μmol/L,0.52 μmol/(min*g protein) and 4.34 ml/(min*g protein), respectively.</p><p><b>CONCLUSION</b>The conditions of tri-expressing of CYP3A4, POR and cyt b5 have been optimized in the study and the product CYP3A4 is obtained with higher metabolic activity.</p>

Heterogeneous expression of human CYP and its application in early stage of new drug research and development / 浙江大学学报·医学版

Human cytochrome P450 (CYP) has a pivotal role on metabolism of xenobiotics and endogenous substances in clinical practice. Since the CYP from human tissue is very complex, and the human tissue itself is not easy to obtain, investigators begin to use all kinds of expression system to heterogeneously express the CYP. The single CYP expressed was then used for drug metabolism and drug-drug interaction research, to improve the efficiency of high-throughput drug screening greatly. Besides, since the polymorphism of drug-metabolizing enzymes makes efficacy variance for some drugs in different population, the heterogeneous expression and drug metabolizing research of certain CYP mutants will be helpful to guide the optimization of therapeutic regimen and conduct the personalized medication.