T cell apoptosis at the maternal–fetal interface in early human pregnancy, involvement of galectin-1

The human fetus is not rejected by the maternal immune system despite expressing paternal antigens. Natural killer cells, the major lymphocyte population of the human decidua (dNKs), express genes with immunomodulatory potential. These include galectin-1 (gal1), a lectin with apoptotic activity on activated CD8⁺ T cells, Th1 and Th17 CD4⁺ cells. Although many cell types at the maternal–fetal interface also produce gal1, its production by dNKs has been used here to study its function in pregnancy. Media conditioned by dNKs containing gal1 induced apoptosis of activated T cells. This effect was blocked by anti-gal1 antibodies. Decidual T (dT) cells but not peripheral T (pT) cells bound gal1 and presented a distinct glycophenotype compatible with sensitivity to gal1. Annexin V staining, TUNEL, and hypodiploidy showed a substantial proportion of apoptotic dT cells. Immunohistochemistry revealed widespread expression of gal1 as well as periglandular apoptotic dT foci that colocalized with dNKs. Thus, secretion of gal1 by dNKs and other decidual cells contributes to the generation of an immune-privileged environment at the maternal–fetal interface.     

蜕膜自然杀伤细胞在人早孕期基蜕膜和壁蜕膜的分布比较

目的对比蜕膜自然杀伤(decidual natural killer,dNK)细胞在人早孕期同一个体基蜕膜和壁蜕膜中的分布,探讨其在早孕期的可能作用。方法采用HE染色和免疫组织化学方法标记细胞角蛋白7阳性细胞以区分壁蜕膜和基蜕膜,进而检测CD56的表达,从而显示壁蜕膜和基蜕膜中dNK细胞的数量。结果基质中有细胞角蛋白7阳性的绒毛外滋养层细胞的是基蜕膜标记;CD56呈阳性反应的dNK细胞在基蜕膜中的数量明显多于(P<0.01)壁蜕膜。结论蜕膜自然杀伤细胞在人正常早孕蜕膜中的分布不同,其可能与滋养层细胞的侵入有关。     

孕酮诱导的蜕膜蛋白Depp在哺乳细胞株的转染表达与定位

目的 将孕酮诱导的蜕膜蛋白Depp基因构建到pCDGFP表达载体中,分析其在哺乳细胞株中的表达和定位情况.方法 用PCR方法扩增Depp全长序列,插入真核表达载体pCDGFP中,将构建好的质粒转染至COS7细胞,在荧光显微镜下观察其细胞定位;转染至HEK 293T细胞,提取总蛋白,利用GFP抗体进行Western bl...     

白细胞介素-2在反复自然流产患者绒毛及蜕膜组织中的表达

目的:研究白细胞介素-2(IL-2)在反复自然流产患者绒毛及蜕膜组织中的表达水平及意义.方法:应用免疫组织化学和图像分析,分别对30例反复自然流产患者(病例组)和30例正常妊娠者(对照组)绒毛和蜕膜组织中IL-2的表达进行定位和半定量分析;应用显微镜观察反复自然流产患者绒毛和蜕膜组织的形态学变化.结果:免疫组织化学显色显示,IL-2蛋白定位于绒毛组织的滋养层细胞和蜕膜组织的蜕膜细胞细胞质内,且病例组的IL-2蛋白表达高于对照组.H-E染色结果显示,病例组的蜕膜组织结构模糊、细胞变性坏死、部分细胞连接消失,血管内皮有缺损;绒毛组织的滋养层变薄,细胞变性坏死,细胞嗜酸性增强,绒毛中轴纤维化程度增强.结论:绒毛和蜕膜组织中IL-2蛋白的高表达与反复自然流产有关,可能参与反复自然流产的病理过程.     

The up side of decidual natural killer cells: new developments in immunology of pregnancy

Early phases of human pregnancy are associated with the accumulation of a unique subset of natural killer (NK) cells in the maternal decidua. Decidual NK (dNK) cells that are devoid of cytotoxicity play a pivotal role in successful pregnancy. By secreting large amounts of cytokines/chemokines and angiogenic factors, dNK cells participate in all steps of placentation including trophoblast invasion into the maternal endometrium and vascular remodelling. In this review, we summarize some of dNK cell features and discuss more recent exciting data that challenge the conventional view of these cells. Our new data demonstrate that dNK cells undergo fine tuning or even subvert their classical inhibitory machinery and turn into a real defence force in order to prevent the spread of viruses to fetal tissue. Today it is not clear how these phenotypic and functional adaptations impact cellular cross‐talk at the fetal–maternal interface and tissue homeostasis. Ultimately, precise understanding of the molecular mechanisms that govern dNK cell plasticity during congenital human cytomegalovirus infection should lead to the design of more robust strategies to reverse immune escape during viral infection and cancer.     

超声波对早孕蜕膜中免疫活性细胞影响的研究

采用诊断超声强度经腹部辐照宫腔.取早孕蜕膜,检测其中的免疫活性细胞,以探讨超声波对早孕蜕膜中免疫活性细胞的影响。结果表明:诊断超声强度未能影响早孕蜕膜中T淋巴细胞及其亚群的状态,却可使巨噬细胞数目减少,或许在一定程度上会削弱宫腔局部的抗感染能力。