Objective:To observe the effect of different concentrations of thiopental and Midazolam on the differentiation of T helper cells in vitro in adults. Methods:Peripheral venous blood samples were collected from 20 middle-aged healthy donors. In each volunteer,20 ml of blood was divided into 7 groups:control group,3 thiopental groups(4 μg/ml,20 μg/ml, 40 μg/ml),3 midazolam groups(50 ng/ml, 150 ng/ml, 500 ng/ml). Whole blood and mononuclear cells from peripheral blood(PBMCs) were incubated with different concentrations of thiopental and midazolam for 24 h, while the control group without any drugs. Then the stimulants- phorbolmyristate+lonomycin+glogistop were added to whole blood and phytohemagglutinin(PHA) was add to PBMCs. The whole blood was incubated for another 4 h and PBMCs were incubated for another 48 h. Then the T-lymphocytes were collected for determination of intracellular level of IFN-γ(as a marker of Th1 cells) and IL-4(as a marker of Th2 cells) in the whole blood using flow cytometry and the expression of CCR5+(as a marker of Th1 cells) and CCR3+(as a marker of Th2 cells) in PBMCs. Results:Compared with the control group, in thiopental 20 μg/ml, 40 μg/ml group, the percentage of Th1 cells decreased significantly. Among different concentration in thiopental groups, the percentage of Th1 cells in high-dose or middle-dose group was obviously lower than that in low-dose group, the percentage of Th2 cells in high-dose was obviously lower than that in low-dose group. In midazolam group, there was no significant change. Conclusion:Thiopental can inhibit Th1 activity and shift the balance towards immunosuppressive Th2-like responses predominantly. Midazolam has no significant effect on Th1 and Th2 activity.
ZOU Rong,CHEN Ping,JIN Wen-jie,HUANG Ya-hui,QIAN Yan-ning.Effects of pretreatment with thiopental and midazolam on the differentiation of human helper T cells in vitro[J].,2007,(6):602-605.