卵巢癌CD90+肿瘤干细胞的生物学特性

BACKGROUND: Thinking from ovarian cancer stem cell theory shows that: in the tumor cells, there are a fraction of stem cells with self-renewing ability and multipotent differentiation, which are the root causes of ovarian cancer recurrence and drug resistance. Studies have shown that CD90 can be used as a surface marker of mesenchymal stem cells and stem cells of other cancers.OBJECTIVE: To explore the biological features of CD90⁺ tumor cells from ovarian cancer tissues.METHODS:Primary ovarian cancer cells were isolated from the abdominal dropsy of ovarian cancer patients to sort CD90⁺ and CD90^- cells using flow cytometry. RT-PCR was used to detect expressions of stem cell-related genes and epithelial to mesenchymal transition-related genes. Cell invasion was observed by Transwell invasion assay, cell proliferation and differentiation observed by clone formation assay, stem cell potential observed by suspension sphere-forming assay, and tumor formation rate observed by in vivo tumorigenicity experiment.RESULTS AND CONCLUSION: Compared with the CD90^- cells, the expressions of CD44, CD133, ALDH1, N-cad and Vimentine were significantly higher in the CD90⁺ cells (P < 0.05), but the expression of E-cad was significantly decreased in the CD90⁺ cells (P < 0.05). Tumor formation rates of CD90^- and CD90⁺ cells were increased significantly with the increase of seeded cell number, which was more obvious in CD90⁺ cells. The number of transmembrane cells, the number of cell clones and the number of suspended spheres were significantly higher in the CD90⁺ cells than the CD90^- cells (P < 0.05). Experimental findings from this study show that CD90⁺ cells highly express epithelial to mesenchymal transition-related genes and stem cell-related genes, with higher invasion, proliferation and differentiation, in vivo tumorigenicity and potential of stem cells. CD90⁺ cell separation may be a new method to separate ovarian cancer stem cells.  中国组织工程研究杂志出版内容重点：干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程     

脐血CD34+CD19-造血干/祖细胞体外B细胞分化条件研究

目的:研究体外脐血造血干/祖细胞向B细胞分化的条件.方法:体外免疫磁珠分离纯化脐血CD34+CD19-造血干/祖细胞;在小鼠S-17基质细胞支持下,脐血CD34+CD19-造血干/祖细胞、T3、各种细胞因子共培养建立体外B细胞分化发育培养体系,诱导脐血CD34+CD19-造血干/祖细胞向B细胞分化;用流式细胞仪检测培养的B细胞.结果:T3、IL-7与小鼠S-17基质细胞共培养诱导CD34+CD19-造血干/祖细胞28天时,分化形成的B细胞数可达初始培养细胞的198倍,诱导细胞大部分表达CD10、CD19.结论:在选用的实验条件下,T3、IL-7与小鼠S-17基质细胞体外能诱导脐血造血干/祖细胞的B细胞分化.     

白细胞介素8参与CD133^+肝癌细胞的侵袭与转移北大核心

背景:白细胞介素8是一种重要的炎性趋化因子,其在调节肿瘤细胞增殖、血管新生方面发挥了重要作用。目的:探讨白细胞介素8对CD133^+肝癌细胞侵袭转移能力的影响。方法:分离培养人肝癌MHCC97-H细胞株,免疫磁珠分选出CD133^+/CD133-MHCC97-H细胞,流式细胞仪检测CD133表达,ELISA检测上清液白细胞介素8水平。克隆形成实验、裸鼠成瘤实验、Transwell小室分别检测CD133^+/CD133-MHCC97-H细胞克隆形成率、小鼠成瘤能力、细胞迁移侵袭能力。另外,采用白细胞介素8中和抗体处理细胞,比较CD133^+/CD133-MHCC97-H细胞CD133表达、上清液中白细胞介素8水平及细胞克隆形成能力和迁移、侵袭能力。结果与结论:(1)CD133^+MHCC97-H细胞的CD133表达率、上清液白细胞介素8水平及克隆形成率均显著大于CD133-MHCC97-H细胞(P<0.05);(2)细胞浓度为1×10~6 L^(-1)和1×10~7 L^(-1)的CD133^+MHCC97-H细胞接种后有部分小鼠出现皮下移植瘤,但CD133-MHCC97-H细胞在同样细胞浓度下,均未出现皮下移植瘤;(3)CD133^+MHCC97-H细胞的透膜细胞数量均显著大于CD133-MHCC97-H细胞(P<0.05);(4)经白细胞介素8中和抗体处理之后,CD133^+/CD133-MHCC97-H细胞的CD133表达率、上清液中白细胞介素8水平、克隆形成率均显著下降(P<0.05),且CD133^+MHCC97-H细胞下降程度更大(P<0.01);CD133^+MHCC97-H细胞的迁移、侵袭透膜细胞数显著减少(P<0.05),CD133-MHCC97-H细胞则未出现明显的改变(P>0.05);(5)结果表明,白细胞介素8可以特异性参与调节CD133^+MHCC97-H细胞侵袭、转移能力。     

非小细胞肺癌肿瘤组织干细胞标志物CD133的表达

背景：非小细胞肺癌肿瘤组织中干细胞标志物CD133表达会呈现出一定的变化,并与疾病的发生和发展存在一定的联系。目的：探讨非小细胞肺癌肿瘤组织干细胞标志物CD133的表达情况,分析其与临床病理因素以及预后之间的关系。方法：收集135例非小细胞肺癌组织标本和60例正常肺组织标本。采用免疫组织化学染色法检测两组标本CD133的表达,并分析非小细胞肺癌肿瘤组织中CD133蛋白的表达与临床病理因素之间的关系。结果与结论：①非小细胞肺癌组CD133蛋白阳性表达率显著高于正常对照组(P < 0.05)。②CD133蛋白阳性表达与非小细胞肺癌患者年龄、性别以及肿瘤大小、肿瘤位置、组织学类型无关(P > 0.05);随着非小细胞肺癌肿瘤组织分化越差,CD133蛋白阳性表达呈现出不断上升趋势(P < 0.05);CD133蛋白阳性表达率在不同临床分期以及淋巴结有无转移之间差异也有显著性意义(P < 0.05)。③CD133以及TNM分期是非小细胞肺癌患者预后独立影响因素(P < 0.05),CD133蛋白表达阳性组中位生存时间显著短于阴性组(P < 0.05)。以上结果表明CD133参与非小细胞肺癌的发生和发展以及浸润和转移,对疾病的进展以及预后判断有重要的临床意义。中国组织工程研究杂志出版内容重点：干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程     

CD133+卵巢癌干细胞样细胞在血管内皮细胞中的分化

背景：大量研究证实,新生血管形成在肿瘤的生长、浸润以及转移过程中发挥重要作用。 目的：探讨CD133+卵巢癌干细胞样细胞向血管内皮细胞分化的特点。 方法：通过无血清培养方法从卵巢癌A2780细胞株中成功诱导出CD133⁺卵巢癌干细胞样细胞,在体外接种于铺或不铺Matrigel基质胶的96孔板内,观察不同时间点CD133⁺卵巢癌干细胞样细胞和人脐静脉内皮细胞形成管腔样结构能力。通过裸鼠皮下移植实验,免疫荧光法观察CD133⁺卵巢癌干细胞样细胞在卵巢癌血管新生中的作用。 结果与结论：CD133⁺卵巢癌干细胞样细胞和人脐静脉内皮细胞(阳性对照)在未铺 Matrigel基质胶上并不能形成相应的管腔结构,且不表达内皮细胞标志物CD31,在Matrigel基质胶上能够形成相对稳定的管腔结构,CD31表达明显。CD133⁺卵巢癌干细胞样细胞接种裸鼠皮下成瘤后,可观察到肿瘤组织中有人源性CD31的表达。结果表明CD133⁺卵巢癌干细胞样细胞能够分化为血管内皮细胞,参与肿瘤血管重建。中国组织工程研究杂志出版内容重点：干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程     

Thymic Nurse Cells Support CD4^-CD8^＋ Thymocytes to Differentiate into CD4^＋CD8^＋ Cells

Thymic nurse cells （TNCs） represent a unique microenvironment in the thymus for T cell maturation. In order to investigate the role of thymic nurse cells during T cell differentiation, a TNC clone, RWTE-1, which formed a typical complex with fetal thymocytes in vitro was established from normal Wistar rat. Hanging drop culture method was applied to reveal the interaction between TNCs and thymocytes. Our result revealed that eighty percent of immature CD4^-CD8^＋ cells differentiated into CD4^＋CD8^＋ cells after a 12-hour hanging drop culture with RWTE-1. However, in a 12-hour culture of immature CD4^-CD8^＋ cells with or without RWTE-1 supernatant, only 30% of the cells differentiated into CD4^＋CD8^＋ cells spontaneously. This observation led to the conclusion that RWTE-1 cell has the capacity to facilitate immature CD4^-CD8^＋ thymocytes to differentiate into CD4^＋CD8^＋ T cells by direct interaction.     

CD4+CD25+调节性T细胞防治移植物抗宿主病的研究进展

异基因造血干细胞移植是目前治疗白血病、淋巴瘤等恶性血液疾病的有效手段,但是其疗效却受到了移植后发生的移植物抗宿主病的制约与限制.近年来,随着对CD4+CD25+调节性T细胞(Treg)研究的深入,人们发现这一T细胞亚群不仅在维持免疫自稳和抑制异体免疫应答方面具有重要作用,并且对于预防与治疗移植物抗宿主病也有一定的潜力.     

人CD133基因转染细胞株的建立及其生物学功能的初步研究

目的:构建人干细胞标记分子CD133-2转基因细胞并探讨CD133-2分子的生物学功能。方法:利用分段克隆和重叠PCR方法从人胎肝cDNA文库中克隆出人CD133-2全长基因,经双酶切后装入真核表达载体p IRES2-EGFP中,用脂质体法转染L929细胞,加入G418选择性培养基进行筛选。经RT-PCR、Western blot、流式细胞术(FCM)等方法鉴定转基因细胞;MTT法分析转基因细胞对T细胞的体外增殖作用;流式细胞仪分析T细胞表面活化分子标记CD4CD25、CD8CD25的表达。结果:成功克隆和构建了能稳定表达人CD133-2分子的转基因细胞CD133-2/L929,该转基因细胞与T细胞共培养可抑制其体外增殖,下调T细胞表面分子CD4CD25和CD8CD25的表达。结论:稳定表达CD133-2蛋白的转基因细胞株的建立为该基因功能的后续研究奠定了物质基础。     

造血干细胞的两种形式：CD34^＋和CD34^—

造血干细胞（HSC）的表面标记是对HSC进行深入研究的关键，CD34抗原是一公认的指标，但近来大量的资料表明尚存在CD34^-的干细胞，两种形式HSC共存还是CD34细胞源于CD34^-细胞引起了很大争议，本文对此作一综述。     

应用流式细胞仪检测CD34+细胞方法学评价

应用流式细胞术(FACS)测定动员后的外周血及采集的自体外周血造血干细胞(APBSC)中的CD34+细胞及其亚群,操作简单、快速、重复性好,对及时掌握最佳采集时机,准确判断采集的干 /祖细胞数量具有重要指导意义.为准确检测外周血及 APBSC中的CD34+细胞,本文比较了几种 FACS检测CD34+细胞方法的异同.     

内分泌和化疗对乳腺肿瘤患者干细胞的影响

BACKGROUND:Tumor stem cells are the root of cancer recurrence and metastasis, so clinical researches should focus on the effects of different treatments on tumor stem cells. OBJECTIVE:To explore the effects of endocrine therapy and chemotherapy on stem cells in patients with breast cancer. METHODS:After recovery and cultivation of estrogen receptor-positive human breast cancer cell lines MCF-7, passage 3 cells in logarithmic phase were selected and divided into three groups containing control, estradiol and estradiol with tamoxifen groups. The estradiol group was divided into three subgroups: 10^-7, 10^-8 and 10^-9 mol/L estradiol was added into the medium, respectively; the estradiol with tamoxifen group was divided into three subgroups: 10^-7, 10^-8 and 10^-9 mol/L estradiol with 10^-6 mol/L tamoxifen were added into the medium, respectively. The same amount of absolute ethyl ethanol was added into the medium of control group. Fifteen female patients with late recurrence and metastasis of breast cancer received chemotherapy as recurrence and metastasis group. Another 15 healthy volunteers were selected as healthy control group. RESULTS AND CONCLUSION:The proportion of CD44⁺CD24^-/low cell subsets in the estradiol and estradiol with tamoxifen groups was significantly higher than that of the control group (P < 0.05), and the proportion of CD44⁺CD24^-/low cell subsets in the estradiol group was significantly higher than that of the estradiol with tamoxifen group at the same concentration (P < 0.05). The proportion of CD44+CD24-/low cell subsets had no significant differences among groups at 10 and 20 days of culture (P < 0.05). The proportion of CD44⁺CD24^-/low cell subsets significantly increased in MCF-7 cells after 24-hour intervention with different chemotherapy drugs. But only the proportion of CD44⁺CD24^-/low cell subsets in the paclitaxel and doxorubicin groups was significantly higher than that of the control group after 20-day intervention (P < 0.05). Besides, the proportion of CD44⁺CD24^-/low cell subsets in the peripheral blood of healthy volunteers was significantly lower than that of the recurrence and metastasis group (P < 0.05). Among 15 patients with late recurrence and metastatic of breast cancer, 9 had stable disease, 5 had partial remission, 1 had failed chemotherapy and cancer progression. Moreover, the proportion of CD45^-CD44⁺CD24^-/low cell subsets in the peripheral blood of patients sensitive for chemotherapy was significantly lower than that before treatment (P < 0.05). In conclusion, both endocrine therapy and chemotherapy exert a certain effect on the CD44⁺CD24^-/low cell subsets of breast cancer positive for estrogen receptor. Given that CD44⁺CD24^-/low cell subsets in MCF-7 cells resist chemotherapy drugs, the proportion of CD45^-CD44⁺CD24^-/low cells in the peripheral blood of patients sensitive for chemotherapy is decreased.     

MCF7细胞中肿瘤干细胞的增殖特征

背景：肿瘤干细胞学说认为,肿瘤干细胞是肿瘤不断增殖的根源,并与肿瘤的浸润转移、耐药现象密切相关。 目的：在单细胞水平研究体外传代培养的MCF7细胞中肿瘤干细胞含量变化规律,认识肿瘤干细胞在体外培养环境下的增殖特点。 方法：利用单细胞分离种植-成瘤性克隆方法对传代培养后不同时间点MCF7细胞中肿瘤干细胞的比例连续检测,流式细胞仪同步检测相应细胞样本中CD44⁺CD24^-/low亚群的含量变化。 结果与结论：传代后培养的MCF7细胞在不同时间点其肿瘤干细胞比例及CD44⁺CD24^-/low亚群比例均呈现有规律的变化。但CD44⁺CD24^-/low亚群变化更为显著(36.84%到81.95%),而肿瘤干细胞含量仅在小范围波动(38.54%~47.39%)。结果提示传代培养的MCF7细胞中,肿瘤干细胞具有通过调节自身增殖来保持其比例相对稳定的特点;CD44⁺CD24^-/low亚群并不代表或者富集MCF7细胞株中的肿瘤干细胞亚群。     

肝癌干细胞分离及其细胞生物学特性

背景：正常干细胞和肿瘤干细胞在基因表达和依赖的细胞信号通路上应该存在不同,如何发现能选择性杀伤肿瘤干细胞的治疗手段是一个仍然需要大量研究的课题。 目的：分离人肝癌细胞系肿瘤干细胞MHCC97,分析其细胞生物学特性。 方法：采用流式细胞技术在人高转移肝癌细胞系MHCC97中筛选肿瘤干细胞,分离正常人肝脏干细胞CD133^-CD34^- MHCC97和人肝癌细胞系肿瘤干细胞CD133⁺CD34⁺ MHCC97,分别检测其表型、生长曲线、细胞周期和多系分化能力。 结果与结论：人肝癌细胞系CD133⁺CD34⁺ MHCC97肿瘤干细胞的表型为CD133⁺CD34⁺ ,人肝癌细胞系CD133⁺CD34⁺ MHCC97具有与CD133^-CD34^- MHCC97相似的细胞曲线和生长周期,可以向上皮和内皮细胞分化,并表达相应特异性的分子标志。提示人肝癌细胞系中CD133⁺CD34⁺MHCC97细胞具有肿瘤干细胞的特性,可以向内皮和上皮细胞分化,同时具有肿瘤干细胞的生物学特性,是肿瘤复发转移的根源,也是临床治疗的靶点。中国组织工程研究杂志出版内容重点：干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程全文链接：     

结直肠腺癌组织中CD44+/Oct4+癌干细胞的形态及分布

背景：越来越多的证据显示CD44可作为结直肠腺癌干细胞的一个特异性的标志物,近年发现胚胎干细胞转录因子Oct4在结直肠腺癌中有表达。 目的：观察CD44⁺/Oct4⁺细胞在原发性结直肠腺癌组织中的数量、位置及分布方式。 方法：取108例结直肠腺癌、18例癌旁正常肠黏膜组织及18例伴不典型增生的结直肠腺瘤标本制成48点共3块组织芯片,应用免疫组织化学双重染色和苏木精-伊红染色,定位CD44⁺/Oct4⁺肿瘤细胞,观察计数并在苏木精-伊红切片的对应位置上观察其形态特征。 结果与结论：免疫组织化学双重染色结果显示,癌旁正常肠黏膜中未见CD44⁺/Oct4⁺细胞,在伴不典型增生的腺瘤中可见极少量CD44⁺/Oct4⁺细胞,结直肠腺癌中可见到少量CD44⁺/Oct4⁺细胞。双阳性细胞主要分布在腺管样结构基底膜侧或共壁腺体的共壁侧,呈小灶状或散在点状分布;细胞呈卵圆形或立方状,胞浆稀少,胞核规则,均质深染,呈卵圆形或高柱状。其数量与结直肠癌分化程度呈负相关(r=-0.579,P < 0.01),与肿瘤浸润深度有一定关联(r=0.236,P < 0.05)。结果提示CD44⁺/Oct4⁺细胞可能是结直肠腺癌干细胞。中国组织工程研究杂志出版内容重点：干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程全文链接：     

miR-1231对结肠癌干细胞增殖、凋亡和侵袭的影响

BACKGROUND:Previous studies have found that miR-1231 is down-regulated in colon cancer stem cells (CCSCs), but the effect of miR-1231 on CCSCs remains unclear. OBJECTIVE:To explore the effect of miR-1231 on the proliferation, apoptosis and invasion of CCSCs (CD133⁺CD44⁺). METHODS: CD133⁺CD44⁺ cells and CD133^-CD44^- cells were separated from SW1116 cells by immunomagnetic bead separation. The expression level of miR-1231 in CD133⁺CD44⁺ and CD133^-CD44^- cells was detected by qRT-PCR. miR-1231-overexpressing CD133⁺CD44⁺ cells were transfected with miR-1231 mimics or miR-control by lipofection transfection. The effects of miR-1231 on CD133⁺CD44⁺ cell proliferation, apoptosis and invasion were investigated by MTT, flow cytometry and Transwell assays, respectively. In addition, the expression levels of Ki67, Bax, Bcl-2, MMP-2 and MMP-9 protein in miR-1231-overexpressing CD133+CD44+ cells and control cells were detected by western blot. RESULTS AND CONCLUSION:CD133⁺CD44⁺ and CD133^-CD44^- cells were obtained by the immunomagnetic bead separation. The expression level of miR-1231 in CD133⁺CD44⁺ cells was significantly lower than that in CD133^-CD44^- cells. miR-1231 suppressed CD133⁺CD44⁺ cell proliferation and invasion, but promoted the apoptosis in these cells. Western blot analysis showed that miR-1231-overexpressing CD133⁺CD44⁺ cells had obvious decreases in Ki67, Bcl-2, MMP-2 and MMP-9 protein expression and a significant increase in Bax protein expression compared with control cells. All these results further confirm that miR-1231 inhibits the proliferation and invasion but promotes the apoptosis in CD133⁺CD44⁺ cells. These findings suggest that miR-1231 can be a suppressor of CCSCs, which offers a novel potential therapeutic target for CCSCs and colon cancer.     

恶性肿瘤干细胞标记物CD34在鼻咽癌细胞系的表达

BACKGROUND:Previous research have confirmed that CD34 is closely related to oncogenesis, progress, recurrence, metastasis and drug-resistance of various cancers, but its role in nasopharyngeal carcinoma remains unclear. OBJECTIVE:To sort cells positive and negative for CD34 in nasopharyngeal carcinoma cell lines and to detect cell proliferation and migration. METHODS:Expressions of CD34 in nasopharyngeal carcinoma cell lines 5-8F, 6-10B, CNE1 and CNE2 were detected by flow cytometry. And CD34+ and CD34^- cells were sorted based on cell surface markers for purity identification. Afterwards, proliferation and migration of CD34⁺ and CD34^- cells were detected by MTT assay, colony-formation assay and scratch assay. RESULTS AND CONCLUSION:All four nasopharyngeal carcinoma cell lines expressed CD34 in 0.1%-0.2%, and the level of CD34 was closely related to the cell growth density. The purity of CD34⁺ cell was more than 98% in the sorted CD34⁺ cell populations, but no CD34⁺ cells were found in the sorted CD34^- cell populations. At 1, 3, 5 and 7 days the proliferation rate of CD34⁺ cell, populations was significantly higher than that of CD34^- cells (P < 0.05). Consistently, the colony-formation efficiency of CD34⁺ cell was significantly higher than that of CD34^- cells (P < 0.05). Moreover, CD34⁺ cells migrated significantly faster than CD34^- cells by scratch assay (P < 0.05). In conclusion, CD34⁺ cells cultured in vitro display higher proliferation and migration capacities, indicating that CD34⁺ cells have the potential of nasopharyngeal carcinoma stem cells.     

CD44+/CD24-细胞在乳腺癌组织及细胞系中的数量与分布

目的 检测CD44+/CIY24-细胞在乳腺癌组织及细胞系中的分布及数量,探讨其与乳腺癌常用标志物表达和乳腺癌分子亚型的关系.方法 采用免疫组织化学SP双染及单染法,分别检测了60例乳腺浸润性导管癌中的CD44及C1724的共表达情况和ER、PR、HER2、人雌激素诱导蛋白PS2、bcl-2、nm23的单独表达情况,同时检测了三种乳腺痛细胞系(MCF-7、MDA-MB-468及MDA-MB-231)中CD44及CD24的表达情况.结果 不同病例标本中CD44+/C1724-细胞的数量差异较大,分布无明显规律,总阳性率为65.0%;CD44+/CD24-细胞数量与患者年龄、肿瘤大小、淋巴结转移情况及ER、PR、HER-2、人雌激素诱导蛋白PS2、bcl-2、nm23表达情况无关(P均>0.05);CD44+/CD24-细胞数量与乳腺癌分子亚型无关.CD44+/CIY24-细胞在MCF-7、MDA-MB-468及MDA-MB-231细胞系中的比例分别为<1%、5%及>80%.结论 CD44+/CD24-细胞存在于部分乳腺癌组织及细胞系中,其数量及分布与乳腺癌的分子亚型和临床病理参数无直接关系.     

急性淋巴细胞白血病的免疫分型及CD4+CD25+T调节细胞检测

背景：在急性淋巴细胞白血病发病过程中,CD4⁺CD25⁺T调节细胞对机体免疫反应可能起着一定的调节作用。 目的：观察急性淋巴细胞白血病患者的免疫分型及外周血CD4+CD25+T调节细胞的变化情况。 方法：采用流式细胞仪对35例急性淋巴细胞白血病患者进行免疫分型,并检测外周血CD4⁺CD25⁺T调节细胞的数目,与18名健康对照作比较。 结果与结论：急性B细胞淋巴细胞白血病22例,急性T细胞淋巴细胞白血病13例;22例急性B细胞淋巴细胞白血病中CD19的阳性表达率最高(100%),而13例急性T细胞淋巴细胞白血病中CD7阳性表达率最高(100%)。急性B细胞淋巴细胞白血病患者外周血CD4⁺CD25⁺T调节细胞和急性T细胞淋巴细胞白血病患者差异无显著性意义(P > 0.05),但均高于健康对照(P < 0.05)。表明急性B细胞淋巴细胞白血病中CD19阳性表达率最高,急性T细胞淋巴细胞白血病中CD7阳性表达率最高,同时急性淋巴细胞白血病患者外周血CD4⁺CD25⁺T调节细胞水平显著增高。     

血红素加氧酶1在间充质干细胞上调哮喘患者外周血调节性T细胞中的作用

背景：上调CD4⁺CD25⁺CD127^low/-调节性T细胞是目前治疗哮喘的新靶点。骨髓间充质干细胞在体外可上调正常人外周血的调节性T细胞,但机制尚未明确。 目的：观察血红素加氧酶1对间充质干细胞上调哮喘患者外周血CD4⁺CD25⁺CD127^low/-调节性T细胞的影响。 方法：分别加入0,15,30,45,60 μmol/L氯化高铁血红素和0,5,10,15,20 μmol/L锌-原卟啉对骨髓间充质干细胞进行预处理,荧光定量PCR检测各组间充质干细胞中血红素加氧酶1 mRNA的表达量。密度梯度离心法分离哮喘急性发作期患者和健康对照者的外周血单个核细胞,分别与经氯化高铁血红素预处理、经锌-原卟啉预处理、不经预处理的间充质干细胞共孵育,加入植物血凝素反应72 h,流式细胞仪检测各组CD4⁺CD25⁺CD127^low/-调节性T细胞占CD4⁺T细胞的比例。 结果与结论：人骨髓间充质干细胞中有血红素加氧酶1表达,其表达在体外可被诱导和抑制。间充质干细胞中血红素加氧酶1 mRNA的表达量随氯化高铁血红素浓度增加而增加(P < 0.05),随锌-原卟啉浓度增加而减少(P < 0.05),具有剂量依赖性。间充质干细胞在体外可提高哮喘患者和健康对照者CD4⁺CD25⁺CD127^low/-调节性T细胞的水平(P < 0.01),诱导间充质干细胞中血红素加氧酶1的表达可使共孵育后CD4⁺CD25⁺CD127^low/-调节性T细胞水平提高(P < 0.01),抑制间充质干细胞中血红素加氧酶1的表达可使共孵育后CD4⁺CD25⁺CD127^low/-调节性T细胞的水平降低(P < 0.01),但仍高于对照组(P < 0.01)。提示骨髓间充质干细胞部分通过血红素加氧酶1上调哮喘患者外周血CD4⁺CD25⁺CD127^low/-调节性T细胞。     

Characterization of CD28CD4 T cells in living kidney transplant patients with long-term allograft acceptance

CD28⁻CD4⁺ T-cell subpopulation is expanded in kidney allograft patients with long graft survival. To seek for the roles of CD28⁻CD4⁺ T cells in the long-term acceptance of kidney allografts, we characterized this population by analyzing cell surface molecules, TCR V_β repertoire, mixed lymphocyte reaction (MLR), and cytokine production. The number of CD28⁻CD4⁺ T cells increased correlatively with time after transplantation in this group of patients. The CD28⁻CD4⁺ T cells did not express detectable levels of CD25, CD69, V24, or CTLA-4 but expressed heterogeneous amounts of CD45 RA on the surface. Freshly sorted CD28⁻CD4⁺ T cells revealed a restricted V_β repertoire, whereas the V_β usage of CD28⁺CD4⁺ T cells from the same patients was much diversified. Expression levels of TGF-β and IFNγ gene were significantly higher in the CD28⁻ CD4⁺ T cells than in the CD28⁺CD4⁺ T cells from the kidney allograft patients. These findings suggest that an oligoclonal CD28⁻ CD4⁺ T-cell population is continuously activated in patients with long allograft survival, which may be linked with the long-term acceptance.