特发性血小板减少性紫癜患者单个核细胞PD-1/PD-Ls的变化及临床意义

目的探讨特发性血小板减少性紫癜(idiopathic thrombocytopenic purpura,ITP)患者外周血程序性死亡因子PD-1及其配体(PD-Ls)的变化及临床意义。 方法收集26例初诊为急性ITP成人患者治疗前、治疗后3个月、6个月以及1年的外周血标本,用流式细胞术检测其外周血T淋巴细胞和单核细胞上分子(CD273、CD274和CD279)的表达水平;对各项指标进行相关性分析和随机区组的方差检验。 结果与ITP患者治疗前相比,治疗后3个月、6个月以及1年的患者单核细胞PD-Ls表达水平均显著性下降(P<0.05);与治疗后3个月相比,治疗后6个月以及1年的患者CD8^＋T淋巴细胞PD-1表达显著性升高(P<0.05);相关性分析显示ITP患者中单核细胞PD-Ls表达与CD8^＋T淋巴细胞的PD-1呈正相关(P<0.01)。 结论ITP患者治疗过程中血小板数量的变化与单个核细胞PD-1/PD-Ls的表达水平存在关联性,证实PD-1/PD-Ls可作为观察ITP疗效的动态指标。     

中西药相互作用研究:茵陈蒿与对乙酰氨基酚

The purpose of this study is to evaluate the interaction effects of In-Chen-How （Artemisia capillaries Thunb. ） on the pharmacokinetics of acetaminophen and on liver microsomal cytochrome P450 enzyme activity in rats. The rats were divided into control group （ n = 8 ） without In-Chen-How and the pretreated group （ n = 8 ） administered with In-Chen-How （ approximately 1.0 mL · kg^-1, according to weight） for 5 consecutive days. Rats in the control group received water simultaneously. Each rat was then given acetaminophen. The pharmacokinetic parameters of acetaminophen of the two groups were significantly different. In the In-Chen-How pretreated group, the maximum concentration of acetaminophen and the area under the plasma concentration-time curve were reduced about 58.4% , 56.7% and 55.4%. To further explain the results, liver microsomal suspensions were obtained from rats that were randomly divided into control and In-Chen-How pretreated group. The levels of CYP1A2 and CYP2E1 in hepatic microsomal protein from pretreated group were increased as compared to that from the control group. It indicated that In-Chen-How can stimulate the activity of CYP isozymes. The changes in the pharmacokinetics of acetaminophen resulting from the administration of In-Chen-How are related to an increase in metabolic activity of CYP1A2 and CYP2E1.