CD11b与CD27定义的T细胞亚群与HIV疾病进展的相关性研究

目的探究CD11b与CD27定义的T细胞亚群与HIV疾病进展的相关性,为研究HIV感染者T细胞免疫缺陷提供新的思路。方法外周血荧光抗体染色,用流式细胞仪检测CD11b、CD27及各亚群的表达;破膜胞内染色检测各亚群分泌IFN-γ的功能;细胞因子与PBMC共培养,检测CD11b、CD27的变化。结果在HIV-1感染者,CD27~+CD11b~-、CD27~+CD11b~+和CD27~-CD11b~+的T细胞亚群明显降低(P0.05),而CD27~-CD11b~-T细胞亚群明显增多(P0.05),该亚群与CD4~+T细胞呈显著的负相关(r=-0.545,P0.001);CD27~+CD11b~-、CD27~+CD11b~+和CD11b~+CD27~-亚群分泌IFN-γ功能均强于CD27~-CD11b~-亚群;细胞因子TGF-β随着质量浓度的增加对CD11b表达的抑制也逐渐增强,而IL-12和IL-15能够刺激CD11b的增多,IL-2与IL-7能够刺激CD27增多。结论 HIV感染导致人体T细胞亚群发生紊乱。     

慢性粒细胞白血病患者外周血高表达CD266~+Foxp3~+γδ~+T细胞亚群

目的分析慢性粒细胞白血病慢性期(CML-CP)患者外周血γδT细胞及其亚群的表达情况,及其与临床一线酪氨酸激酶抑制剂(TKI)药物治疗疗效的相关性。探讨成纤维细胞生长因子诱导因子14(Fn14,又称CD266)在γδT细胞功能亚群中的表达情况及其与临床疗效的相关性。方法采用流式细胞术检测CML-CP患者以及正常对照组外周血γδT细胞及其功能亚群的表达情况,并探讨γδT细胞各亚群表达比例与临床一线TKI药物治疗疗效的相关性。结果 CML-CP患者外周血γδT细胞功能亚群CD266~+γδ~+T细胞、Foxp3~+γδ+T细胞、CD266+Foxp3~+γδ~+T细胞、CD266~+Vδ1~+T细胞、Foxp3~+Vδ1~+T细胞、CD266~+Foxp3~+Vδ1~+T细胞、CD266~+Vδ2~+T细胞、Foxp3+Vδ2+T细胞和CD266~+Foxp3~+Vδ2~+T细胞的表达比例均显著高于正常对照组。经过一线TKI药物治疗后达到完全血液学反应的基础上,达到警告治疗反应或治疗失败的CML-CP患者外周血CD266~+Foxp3~+Vδ2~+T细胞亚群比例显著增高。Logistic回归分析亦显示CD266~+Foxp3~+Vδ2~+T细胞亚群的表达比例为CML-CP患者经过一线TKI药物治疗后发生难治的危险因素。结论 CD266~+Foxp3~+γδT细胞亚群与CML-CP患者的临床一线TKI药物治疗疗效密切相关。Fn14(CD266)信号通路可能成为复发难治CML患者的新的治疗靶点。     

GD患者外周血CD4+CD28-T细胞亚群的表型特征及临床意义

检测Graves病(GD)患者外周血CD4~+CD28-T细胞水平及其表面CD45RO/CD45RA及ICOS的表达,探讨CD4~+ CD28-T细胞亚群在GD免疫致病机制中的作用。采用三色荧光抗体染色及流式细胞术检测了42例初发GD患者和30例健康者外周血中CD4~+CD28-T细胞的百分率及其表面CD45RO/CD45RA和ICOS表达水平,同时检测其甲状腺功能并进行相关性分析。结果GD患者外周血中CD4~+CD28-T细胞百分率明显高于健康对照组,并高表达ICOS分子,与FT3水平显著正相关;与健康对照组相比,GD患者CD4~+CD28~-CD45RO~+T细胞百分率也显著增高,而CD4~+CD28~-CD45RA~+T细胞呈下降趋势,FT3、FT4水平与CD4~+CD28-T细胞表面CD45RO的表达率呈正相关,而FT3水平与CD45RA表达呈负相关。结论GD患者外周血CD4~+CD28~-T细胞异常增高,表面高表达ICOS分子,具有记忆性细胞的表型特征,与甲状腺功能异常有一定的相关性,CD4~+CD28-T细胞可能是参与GD免疫病理反应的自身反应性T细胞。     

银屑病患者外周血淋巴细胞亚群的变化

目的探讨进行期、静止期和退行期的银屑病患者外周血淋巴细胞亚群的变化及免疫机制。方法本研究评估了77例寻常型银屑病患者(28例进行期、23例静止期、26例退行期)的外周血单个核细胞(PBMCs)各组中各淋巴细胞的比率。结果与退行期相比,进行期和静止期患者的CD3~+、CD4~+和CD8~+淋巴细胞的百分率均显著升高(P0.01)。同进行期比较,静止期和退行期的CD4~-CD8~-淋巴细胞的百分率降低(P0.05)。CD3~-CD16~+CD56~+比例随病情稳定而增高,CD45~+CD14~+比例逐渐下降和CD3~-CD19~+与病情呈负相关,3组的差异显著(P0.05)。结论进行期、静止期和退行期3组银屑病患者的淋巴细胞亚群存在显著的差异,进一步支持银屑病的免疫发病机制。     

新生儿细菌性肺炎患者外周血自然杀伤细胞及CD3~-CD56~-CD16~(bright)亚群比例减少

目的探讨外周血自然杀伤(NK)细胞及其亚群在新生儿细菌性肺炎中的变化及临床意义。方法 44例细菌性肺炎新生儿根据住院天数分为两组,即住院≤10 d组,住院10 d组;根据入院时白细胞(WBC)的数量分为轻度感染组和重度感染组,轻度感染即5.0×10~9/LWBC20.0×10~9/L,重度感染即WBC5.0×109/L或20.0×10~9/L。采用流式细胞术测定44例新生儿细菌性肺炎及22例正常新生儿总NK细胞及其亚群在外周血总淋巴细胞中所占的百分率。结果细菌性肺炎患儿外周血总NK细胞及其亚群CD3~-CD56~-CD16~(bright)的百分率明显低于对照组新生儿;住院≤10 d组患儿外周血CD3~-CD56~-CD16~(bright)亚群占淋巴细胞的百分率明显低于正常对照组新生儿,而总NK细胞及CD3~-CD56~(dim)CD16~(bright)、CD3~-CD56~(bright) CD16~(-/dim)亚群无明显差异。住院10 d组患儿外周血总NK细胞及CD3~-CD56~-CD16~(bright)亚群占淋巴细胞的百分率明显低于正常对照组;住院10 d组外周血总NK细胞及CD3~-CD56~-CD16~(bright)、CD3~-CD56~(dim)CD16~(bright)、CD3~-CD56~(bright)CD16~(-/dim)各亚群占外周血总淋巴细胞的百分率显著低于住院≤10 d组患儿;重度感染的患儿总NK细胞数及其亚群CD3~-CD56~-CD16~(bright)、CD3~-CD56~(dim)CD16~(bright)、CD3~-CD56~(bright)CD16~(-/dim)占外周血淋巴细胞的百分率明显低于轻度感染组;细菌性肺炎患儿外周血中NK细胞CD3~-CD56~(bright)CD16~(-/dim)和CD3~-CD56~(dim)CD16~(bright)亚群占总NK细胞的百分率明显高于正常对照组,而外周血CD3~-CD56~-CD16~(bright)亚群占总NK细胞的百分率明显低于正常对照组。结论新生儿细菌性肺炎患儿病情越严重,住院时间越长,总的NK细胞数量及其各亚群占NK细胞的百分率越低。     

转录因子HELIOS在系统性红斑狼疮患者外周血调节性T细胞亚群中表达格局分析

Treg细胞在系统性红斑狼疮(SLE)发生发展中具有重要作用,而转录因子HELIOS在Treg细胞发挥免疫抑制功能方面发挥关键作用。本研究应用流式细胞术分析HELIOS在SLE患者外周血中CD4~+Treg细胞亚群中的表达格局,有助于揭示SLE的发病机制。结果显示,与健康对照相比,SLE患者外周血CD4~+T细胞中CD25~+Foxp3~+Treg细胞比例显著下降;在CD4~+CD25~+T细胞中,表型为CD39-CD45RA~+Treg细胞(幼稚型Treg细胞)比例显著升高,表型为CD39~+CD45RA-Treg细胞(效应型Treg细胞)比例显著下降,而表型为CD39-CD45RA-T细胞(非Treg细胞)比例不变;在Treg细胞中发挥重要免疫调节作用的转录因子HELIOS,在幼稚型Treg和效应型Treg细胞中比例均显著下降,提示CD4~+Treg细胞亚群比例失衡及其HELIOS表达下调可能在SLE发病机制中发挥重要作用。     

Tim-3和PD-1在慢性丙型肝炎患者不同单核细胞亚群的表达水平分析

目的分析慢性丙型肝炎(CHC)患者外周血单核细胞亚群分布,同时观察负性调节分子T细胞免疫球蛋白及黏蛋白域蛋白3(Tim-3)和程序性细胞死亡蛋白1(PD-1)在各亚群表达的变化及意义。方法利用流式细胞术检测CHC患者外周血单核细胞亚群比例和各亚群Tim-3、PD-1表达,并与临床指标如丙氨酸氨基转移酶(ALT)和天冬氨酸氨基转移酶(AST)采用Spearman方法进行相关性分析。结果与健康对照组比较,CHC患者外周血CD14~+CD16~+单核细胞比例增高,以CD14CD16~+单核细胞比例增高显著。Tim-3在CD14CD16-单核细胞和CD14~+CD16单核细胞上表达水平升高;PD-1在CD14CD16-单核细胞和CD14CD16~+单核细胞上表达水平升高。CHC患者单核细胞亚群以及各亚群Tim-3、PD-1和临床指标ALT及AST无明显相关性。结论 Tim-3和PD-1在不同单核细胞亚群表达水平不同。     

滤泡辅助性T细胞(Tfh)和激活B细胞在帕金森病患者外周血中的水平及意义

目的:探讨帕金森病(PD)患者外周血中滤泡辅助性T细胞(Tfh)和激活B细胞的水平变化及临床意义.方法:选择PD患者73人,健康对照25人.PD患者按照Hoehn-Yahr分期法(H-Y)分为Ⅰ～Ⅳ期.检测外周血单个核细胞(PBMC)中CD4+CXCR5+ICOS+Tfh细胞比例和CD83+CD19+B细胞的比例及Bc...     

日本血吸虫感染小鼠的髓源抑制细胞对T 细胞的免疫抑制

目的:研究日本血吸虫感染小鼠模型中的髓源抑制细胞(MDSCs)的免疫抑制功能及对T细胞的作用机制。方法:构建日本血吸虫感染BALB/c小鼠模型,流式细胞术检测MDSCs动态比例变化,免疫磁珠分选小鼠骨髓中单核系MDSCs(CD11b+Gr1+Ly6G-)和粒系MDSCs (CD11b~+Gr1~+Ly6G~+)亚群细胞,Write-Giemsa染色进行形态学鉴定; CFSE法检测单核系和粒系MDSCs亚群对CD4~+T、CD8+T细胞增殖的抑制作用,Real-time PCR方法检测细胞因子IFN-γ、IL-4、IL-10、IL-13、TGF-β和精氨酸酶(ArgⅠ)、一氧化氮合酶2(NOS2)的表达。结果:血吸虫感染模型小鼠的MDSCs较对照组小鼠明显增多,以粒系MDSCs(CD11b+Gr1+Ly6G+)亚群增多为主。两个亚群细胞均能降低CD4+T、CD8+T细胞的增殖活性,粒系亚群MDSCs的抑制作用更显著; Real-time PCR结果显示两个亚群细胞的细胞因子IL-4、IL-10、IL-13、TNF-α、IFN-γ以及ArgⅠ、NOS2的表达水平均不同程度升高。结论:血吸虫感染模型小鼠体内的MDSCs显著增高,单核系MDSCs(CD11b+Gr1+Ly6G-)和粒系MDSCs(CD11b+Gr1+Ly6G+)亚群均能抑制CD4~+T、CD8~+T细胞增殖,其作用机制可能与两亚群细胞均能上调相关细胞因子IL-4、IL-10、IL-13和ArgⅠ、NOS2的表达有关。     

IL-1β促进nave T细胞向Th22细胞分化及在非小细胞肺癌中表达的相关性研究

目的:研究白细胞介素1β(IL-1β)促进nave T细胞向Th22细胞转化的机制及其在非小细胞肺癌患者外周血中表达的相关性和临床意义。方法:采用CD4~+nave T细胞磁珠分选试剂盒分离健康人外周血单个核细胞中的CD4~+nave T细胞,加入转化生长因子β和IL-2促进其分化增殖,分化过程中加入IL-1β诱导其向Th22细胞的分化,流式细胞术检测CD4~+IL-22~+T细胞的比例,ELISA检测IL-22的表达。选择我院确诊为非小细胞肺癌的患者60人,其中Ⅰ期18人,Ⅱ期20人,Ⅲ期13人,IV期9人,同时选择健康人25例,用流式细胞术检测外周血中Th22(CD4~+IL-22~+)细胞的比例,ELISA检测血清中IL-1β和IL-22的水平。结果:IL-1β可以诱导na6ve T细胞向Th22细胞转化并促进IL-22的分泌(P0.05)。非小细胞肺癌患者外周血中Th22细胞比例及IL-22和IL-1β的水平均高于健康人且与临床分期相关(P0.05)。结论:IL-1β可以诱导Th22细胞的分化和IL-22的表达,三者的水平和非小细胞肺癌的进展相关,可能参与免疫抑制并促进非小细胞肺癌的发生。     

THE PERIPHERAL BLOOD LEUKOCYTE PHENOTYPE IN PATIENTS WITH BREAST CANCER: EFFECT OF DOXORUBICIN/PACLITAXEL COMBINATION CHEMOTHERAPY

Presence of functional immune system is critical for any attempt aimed at improving survival of breast cancer patients by strategies based on immune system manipulation. We evaluated by flow cytometry the phenotype of peripheral blood leukocyte of 43 breast cancer patients. In 11 patients, the phenotype was evaluated before and during the chemotherapy by combination of doxorubicin and paclitaxel (AT). Compared with controls breast cancer patients had significantly higher relative and absolute numbers of CD3^-HLADR⁺, CD3^-CD69⁺ and CD14⁺CD16^-, and significantly lower percentages of CD3^- and CD8^-CD28⁺ cells. After one cycle of AT, the absolute numbers of CD3⁺, CD3^-CD4^-, CD3⁺CD8⁺ and CD8^-CD28⁺ cells increased significantly. Present data show a presence of T-cell activation in breast cancer patients. Administration of AT may lead to an increase in functional T-cells in peripheral blood, indicating a potential for combining chemotherapy with immunotherapy in the treatment of breast cancer patients.     

CD7、CD56共表达对急性髓系白血病侵袭性的影响

目的:探讨CD7和CD56共表达免疫表型对急性髓系白血病（acute myelocytic leukemia,AML）侵袭性的影响。方法:采用多色流式细胞术检测AML患者免疫表型,对6例CD7⁺CD56⁺AML患者和6例CD7^-CD56^-AML患者进行临床资料比较和无病生存（disease-free survival,DFS）率随访。结果:CD7⁺CD56⁺AML在M₀+M₁分型中的分布比例、外周血血红蛋白、骨髓原始细胞比例、中枢系统浸润率均高于CD7^-CD56^-AML,差异具有显著统计学意义（P<0.01或P<0.05）;但平均无病生存期低于CD7^-CD56^-AML,差异具有显著统计学意义（P<0.01）。结论:AML中检出CD7、CD56的共表达的免疫表型意味着预后较差,需加强巩固治疗和中枢系统微小残留病灶监测。     

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.     

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.     

当归多糖对人白血病干细胞体外增殖与体内移植模型的影响

目的 探讨当归多糖(ASP)对人白血病干细胞(LSCs)增殖及体内移植的影响.方法 1.ASP 对CD34+CD38-人LSCs体外增殖的影响.免疫磁性法分选正常人和髓系白血病患者骨髓中CD34+CD38-细胞,分为正常CD34+CD38-对照组、CD34+CD38-LSCs对照组、正常CD34+CD38-ASP组和C...     

老年初诊急性髓细胞白血病患者CD4+CD25+调节性T细胞的表达

背景：研究证实,很多恶性肿瘤患者体内CD4⁺CD25⁺调节性T细胞存在高表达,近期也有研究发现,急性髓细胞白血病患者外周血CD4⁺CD25⁺调节性T细胞同样表现出高比例表达。 目的：分析老年初诊急性髓细胞白血病患者CD4⁺CD25⁺调节性T细胞的表达特点。 方法：纳入初诊急性髓细胞白血病患者92例,将年龄在60岁以下者设为中青年组(n=22),年龄在60岁以上者设为老年观察组(n=70)。在老年观察组中,32例经规范化疗后完全缓解,设为完全缓解组;将余下38例设为老年组,依据FAB分型标准,分为M2 6例、M3 19例、M4 7例、M5 6例。另选择同期体检健康人群42名作为正常对照组。抽取受试者外周静脉血,检测CD4⁺CD25⁺调节性T细胞表达情况。 结果与结论：老年组、完全缓解组CD4⁺CD25^highFOXP3⁺调节性T细胞比例高于正常对照组(P < 0.01),并且老年组CD4⁺CD25^high FOXP3⁺调节性T细胞比例高于完全缓解组(P < 0.01)。老年组、完全缓解组CD4⁺FOXP3⁺T细胞比例高于正常对照组(P < 0.01),并且老年组CD4⁺ FOXP3⁺T细胞比例高于完全缓解组(P < 0.01)。老年组CD4⁺CD25^high FOXP3⁺调节性T细胞与CD4⁺ FOXP3⁺T细胞比例高于中青年组(P < 0.01)。老年组不同分型间CD4⁺CD25^high FOXP3⁺调节性T细胞和CD4⁺ FOXP3⁺T细胞比例比较差异均无显著性意义(P > 0.05)。Pearson相关性检验结果显示,老年初诊急性髓细胞白血病患者外周血CD4⁺CD25^high FOXP3⁺调节性T细胞比例和CD4⁺ FOXP3⁺T细胞比例呈正相关(r=0.87,P=0.019)。表明老年初诊急性髓细胞白血病患者CD4⁺CD25⁺调节性T细胞比例高于健康人群和中青年急性髓细胞白血病患者。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：     

基于10×Genomics技术对蓖麻毒素中毒后中性粒细胞的转录组分析

目的 探究中性粒细胞在蓖麻毒素(Ricin Toxin,RT)致毒过程中的作用,寻找解毒的有效策略.方法 采用10x Genomics单细胞转录组测序技术对中毒小鼠外周血单个核细胞(PBMCs)进行转录组测序及分析,并通过流式细胞术测定目的细胞亚群.结果 经降维聚类、差异基因、拟时序分析结果显示CD177-CD121b...     

Distribution of the natural killer-related receptor for HLA-C during highly active antiretroviral therapy for human immunodeficiency virus infection

Receptors interacting with Major Histocompatibility Complex class I molecules have been initially found on the surface of human natural killer (NK) cells, where they deliver inhibitory signals to the lysis, being thus defined killer inhibitory receptors (KIR). Subsequently, they were detected also on the surface of T-CD8⁺ lymphocytes and are particularly expanded during human immunodeficiency virus (HIV) infection, where they downregulate HIV-specific cytolysis. The expression of KIR recognizing human leukocyte antigen-C alleles was assessed in HIV-infected patients, undergoing highly active antiretroviral therapy (HAART). To this end, the combined expression of CD16/CD56, of CD3 and CD8 as well as of KIR (CD158a and CD158b) surface molecules was analyzed on peripheral blood mononuclear cells by monoclonal antibodies, and flow cytometry. An increase of CD3⁺CD8⁺CD158b⁺ cells was found after 6 months of HAART. This finding may have implications for the regulation of T-cell mediated cytolysis during HAART.     

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。     

K562细胞株侧群细胞中部分白细胞分化抗原的表达

背景：白血病侧群细胞表型的研究对于理解肿瘤细胞的异质性和起源、分子标记和靶向治疗等都有积极意义。 目的：鉴定人慢性粒细胞白血病细胞株K562中是否存在侧群细胞,并观察侧群细胞亚群与非侧群细胞亚群中部分白细胞分化抗原的表达差异。 方法：采用流式细胞术检测K562细胞株中是否存在侧群细胞;并进一步分析K562侧群细胞和非侧群细胞两亚群间CD34+、CD34+CD38-、CD34+CD38+、HLA-DR+细胞的表达情况。 结果与结论：经Hoechst33342染色,流式细胞仪分析结果显示在K562中存在侧群细胞,这部分细胞比例少,为(2.7±0.5)%;统计学分析侧群细胞和非侧群细胞亚群中CD34⁺、CD34⁺CD38^-细胞表达率差异有显著性意义,而CD34⁺CD38⁺细胞表达率和HLA-DR+细胞表达率差异均无显著性意义;侧群细胞和非侧群细胞相比在分化抗原表达上有异质性。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：