特发性血小板减少性紫癜患儿外周血T细胞亚型的分析

T细胞亚型分化漂移可能与一些自身免疫病的发病机制有关。本研究旨在通过分析特发性血小板减少性紫癜（idiopathic thromboeytopenic purpura，ITP）患儿外周血Th／Tc、Th1／Th2、Tc1／Tc2细胞的平衡状态，探讨T细胞亚群失衡在ITP发病机制中的作用。收集30例ITP患儿外周抗凝静脉血，分离纯化得T细胞．以PE标记的抗CRTH2单克隆抗体和Cy5标记的抗CD4、CD8单克隆抗体作双色流式细胞术检测，分析ITP患儿Th／Tc、Th1／Th2、Tc1／Tc2比例的变化。结果显示：ITP患儿外周血T细胞与健康儿童相比，Th细胞百分率及Th／Tc比例明显下降（P〈0.05），Tc细胞百分率无明显变化（P〉0．05）；Th1及Th2细胞百分率明显下降（P〈0．05），Tc1及Tc2细胞百分率无明显变化（P〉0．05），Th1／Th2及Tc1／Tc2比例明显升高（P〈0.05）。结论：ITP患儿外周血可能存在细胞免疫功能低下及T细胞亚群漂移，Th1及Tc1细胞比例升高，呈明显Th1类细胞优势，此结果说明T细亚群分化异常在ITP发病过程中起着重要作用。

Analysis of Peripheral Blood T Cell Subsets in Children with Idiopathic Thrombocytopenic Purpura

The pathogenesis of some autoimmune diseases has been considered to be related to abnormal differentiation of T cell subsets. This study was aimed at investigating the change of Th1-like and Th2-like cells balance in ITP children, and analyzing the role of T cell subsets disequilibrium in the pathogenesis of ITP. Peripheral blood T cells were collected from 30 ITP patients, the T-cells were isolated and purified. The ratios of Th/Tc, Th1/Th2 and Tc1/Tc2 in peripheral blood T cells were analyzed by immunofluorescence staining and bicolor flow cytometry (FCM) in vitro. The results showed that as compared with the ratios of Th1/Th2 (48.76% +/- 6.17%) and Tc1/Tc2 (18.90% +/- 4.12%) in healthy children, the ratios of Th1/Th2 (56.21% +/- 5.95%) and Tc1/Tc2 (23.09% +/- 3.31%) in ITP children increased obviously. FCM analysis revealed that average percentages of Th, Th1, Th2, Tc, Tc1 and Tc2 were 22.31% +/- 6.51%, 21.92% +/- 6.42%, 0.39% +/- 0.14%, 31.12% +/- 6.15%, 30.95% +/- 5.45% and 1.34% +/- 0.84% in ITP children versus 39.24% +/- 5.82%, 39.01% +/- 5.47%, 0.80% +/- 0.16%, 30.25% +/- 5.63%, 28.72% +/- 5.20% and 1.52% +/- 0.68% in healthy children. The average percentages of Th, Th1 and Th2 decreased obviously, while the average percentages of Tc, Tc1 and Tc2 did not change. It is concluded that the ratios of Th1/Th2 and Tc1/Tc2 in peripheral blood T cells increase obviously in ITP children and the cellular immunity in ITP children shifts to Th1 type immunity superiority, which suggest that the abnormal differentiation of T cell subsets may play an important role in the pathologic process of ITP.