Two distinct P70 interleukin-2 receptors on a murine large granular lymphocyte clone Y479.

A continuous cloned cell line (Y479) was established by culturing normal mouse spleen cells in a high concentration of interleukin-2 (IL-2). Y479 cells showed morphological characteristics of large granular lymphocyte with the phenotypes of Thy-1.2+, T3+, Lyt-1-, Lyt-2-, L3T4-, B220-, AsGM1+, LFA-1+, and TcRV beta 8-. The Y479 cells required a high concentration of IL-2 for their growth but did not express detectable p55 IL-2 receptor (IL-2R) although they bound IL-2 with high and low affinities. Analysis of the IL-2 binding proteins on the Y479 cells revealed that both the high and low affinity receptors consisted only of 70 kDa protein. Analysis of the 70 kDa protein was performed using five monoclonal antibodies (L15, L20, L23, L34, and L61) against human recombinant IL-2. Although they recognized different epitopes, all monoclonal antibodies immunoprecipitated 70 kDa IL-2R that was cross-linked with radioiodinated IL-2. The supernatant after immunoprecipitation with L61 still contained IL-2/IL-2R complex that was L23-reactive, and the supernatant after immunoprecipitation with L23 contained L61-reactive IL-2/IL-2R complex, whereas L15 immunoprecipitated almost all the complex. Limited digestion of IL-2-cross-linked Y479 cells with trypsin caused the liberation of 45 kDa IL-2R fragment cross-linked with IL-2. This complex was immunoprecipitated by L15 or L61 but not by L23. These results suggest that there are at least two distinct 70 kDa IL-2R on the surface of Y479 cells.     

Two Distinct P70 Interleukin-2 Receptors on a Murine Large Granular Lymphocyte Clone Y479

A continuous cloned cell line (Y479) was established by culturing normal mouse spleen cells in a high concentration of interleukin-2 (IL-2). Y479 cells showed morphological characteristics of large granular lymphocyte with the phenotypes of Thy-1.2⁺. T3⁺, Lyt-1^?, Lyt-2^?, L3T4^?, B220^?, AsGM₁⁺, LFA-1⁺, and TcRVβ8^?. The Y479 cells required a high concentration of IL-2 for their growth but did not express detectable p55 IL-2 receptor (IL-2R) although they bound IL-2 with high and low affinities. Analysis of the IL-2 binding proteins on the Y479 cells revealed that both the high and low affinity receptors consisted only of 70 kDa protein. Analysis of the 70 kDa protein was performed using five monoclonal antibodies (L15, L20, 1,23, L34, and L61) against human recombinant IL-2. Although they recognized different epitopes, all monoclonal antibodies immunoprecipitated 70 kDa IL-2R that was cross-linked with radioiodinated IL-2. The supernatant after immunoprecipitation with L61 still contained IL-2/IL-2R complex that was L23-reactive, and the supernatant after immunoprecipitation with L23 contained L61-reactive IL-2/IL-2R complex, whereas L15 immunoprecipitated almost all the complex. Limited digestion of IL-2-cross-linked Y479 cells with trypsin caused the liberation of 45 kDa IL-2R fragment cross-linked with IL-2. This complex was immunoprecipitated by L15 or L61 but not by L23. These results suggest that there are at least two distinct 70 kDa IL-2R on the surface of Y479 cells.     

Cytochemical Characterization of Mouse L1210 Leukemia

Mouse lymphatic leukemia L1210 cells were characterized with polyclonal and monoclonal antibodies and lectins. The cells were found to have the phenotype IgG^-, Thy-1.2^-, Lyt-1^-, Lyt-2^-, asialo-GM^-, TL^-, I-A^d-, IL-2R⁺, peanut agglutinin⁺, and Helix pomatia lectin +/-. They retained expression of H-2K^d and H-2D^d. Thus, these cells resemble “null” cells.     

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.     

帕金森病患者外周血中骨髓来源抑制性细胞的检测及临床意义

目的:检测帕金森病患者外周血中2群骨髓来源抑制性细胞及相关临床意义。方法:选择2016年1月~2017年3月于我院收治并确诊为帕金森病的患者80人和健康志愿者20人为研究对象。按照HoehnYahr分期法将80名患者进行分期,其中Ⅰ级22人,Ⅱ级24人,Ⅲ级20人, Ⅳ级14人,Ⅴ级0人。分别收集帕金森病患者和健康志愿者的外周血各5 mL,分离获得单个核细胞,采用流式细胞术检测外周血中CD14~+CD11b~+和CD14~-CD11b~+细胞的水平,磁珠分选2群细胞,通过q PCR检测2群细胞中免疫抑制相关因子精氨酸酶1(ARG1)、白细胞介素10(IL~-10)和环氧合酶2(COX-2)的mRNA水平,Western blot法和ELISA法检测2群细胞表面膜蛋白CD14和CD11b,以及ARG1、IL~-10和COX~-2蛋白表达水平。结果:帕金森病患者外周血中CD14~+CD11b~+细胞比例与正常人相比无明显变化,而CD14~-CD11b~+细胞比例显著增加(P0.05);不同分期的帕金森病患者外周血中CD14~-CD11b~+细胞比例与Hoehn~-Yahr分期呈正相关,且CD14~-CD11b~+和CD14~+CD11b~+细胞共同高表达IL~-10和COX~-2,仅CD14~-CD11b~+细胞中高表达ARG1,与CD14~+CD11b~+细胞和正常人的2群细胞比较具有显著差异(P0.05)。结论:帕金森病患者外周血中CD14~-CD11b~+细胞和ARG1的高水平表达可以作为帕金森病发病和分期的参考依据。免疫抑制在帕金森病的发生和发展中具有重要的意义。     

Analysis of Human Peripheral Blood T Lymphocytes Proliferating in Response to Sensitizing Antigens: Effect of Interleukin-2 (Il-2)-Responsive Bystander Cells

The contribution of interleukin-2 (IL-2)-responsive bystander cells to the proliferative responses of human peripheral blood T lymphocytes to antigens used for sensitization such as Purified Protein Derivative (PPD), Tetanus toxoid (TT) and Influenza virus was investigated. Marked proliferation of the unfractionated peripheral blood mononuclear cells (PBMC) was observed following stimulation with these antigens to which the individuals were known to have been sensitized previously. Depletion of large granular lymphocytes (LGL) from PBMC resulted in substantial reduction in the response of the lymphoid cells in proliferating to the antigens. Proliferation of the T4⁺T8^- (helper)-enriched population, or T4⁺T8^- subset depleted of any IL-2 receptor (IL-2R)-bearing lymphoid cells to these antigens was comparable to that of LGL-depleted PBMC cultures. Cell titration experiments of the blast cells generated from these cultures revealed that PBMC-derived population contained fewer antigen-reactive lymphocytes. These results, therefore, suggested that IL-2-responsive LGL through expansion affected the concentration of antigen-proliferating T cells in the antigen-stimulated PBMC cultures.     

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.     

人脐血单个核细胞中CD133+细胞移植治疗心力衰竭的评价

BACKGROUND:Cell purification can eliminate the biological variability of cells, providing new insight into cell regeneration therapy. OBJECTIVE:To study the Influence of CD133⁺ cells on human umbilical cord blood mononuclear cell transplantation for treatment of heart failure. METHODS:Human cord blood mononuclear cells were isolated using lymphocyte separation medium method, and CD133⁺ and CD133^- cells were sorted using immunomagnetic beads at a cell density of 1×10⁸/L. Forty Sprague-Dawley rats were randomized into five groups: sham group, model group, CD133⁺ cell group, CD133^- cell group and mononuclear cell group. Animal models of heart failure were made using intraperitoneal injection of isoproterenol in all the groups except for the sham group. Rats in the CD133⁺ cell group and CD133^- cell group were given 1 mL CD133⁺ cells plus 1 mL PBS and 1 mL CD133^- cells plus 1 mL PBS via the tail vein, respectively. Rats in the mononuclear cell group were given 1 mL CD133⁺ cells plus 1 mL CD133^- cells via the tail vein, and those in the sham and model groups given 2 mL PBS via the tail vein. After 4 weeks, cardiac pathology, degree of myocardial fibrosis and colonization of CD133⁺ cells in myocardial tissues were observed. RESULTS AND CONCLUSION:Hematoxylin-eosin staining showed that myocardial tissues arranged disorderly in the model group, but regularly in the sham group; myocardial disorders were mildest in the CD133⁺ cell group, successively followed by the mononuclear cell group, and severest in the CD133^- cell group and model group. Masson staining showed that in the model group, collagen fibers were proliferated, arranged irregularly and even broken, while in the sham group, the collagen fibers were less in number and arranged in order. Additionally, there was less reduction in collagen fibers and milder myocardial disorders in the CD133⁺ cell group compared with the other groups. Area of collagen fibers was increased significantly in all the groups except for the sham group (P < 0.05), but this increment was the minimal in the CD133⁺ cell group. Findings from immunohistochemistry and immunofluorescence staining showed that there were no CD133⁺ cells in the myocardial tissues of rats. Therefore, our data indicate that compared with the mononuclear cell transplantation, CD133⁺ cell transplantation exerts superiorities in relieving myocardial damage and reducing myocardial fibrosis. However, CD133⁺ cells are not colonized in the myocardial tissue after transplantation.     

Differential STAT5 activation and phenotypic marker expression by immune cells following low levels of ethanol consumption in mice

Ethanol has been recognized as an immunosuppressive agent for many years. Effects of high levels of ethanol consumption on immune functions have been extensively studied, but little is known about the effects of low levels (scuh as 5% ethanol) of ethanol consumption. Herein we report that exposure of mice to 5% ethanol for 4-8 weeks decreases IL-2-augmented splenic NK cell activity, decreases the numbers of NK cells in spleen and liver, decreases the number of granulocytes (Gr-1⁺) in bone marrow and spleen, and decreases the percentages of B cells in liver. In contrast, the percentages of CD4⁺CD8⁺ thymocytes, CD4⁺CD8^- splenocytes, CD4⁺CD8^- liver nonparenchymal cells, CD3⁺ splenocytes, and CD3⁺ bone marrow cells were increased. Furthermore, exposure to 5% ethanol increases STAT5 activation in T cells and liver cells while decreases STAT5 activation in NK cells. Taken together, these findings suggest that low levels of ethanol consumption can differentially modulate immune cells in thymus, spleen, bone marrow and liver, which may be due to differential regulation of STAT5 activation by ethanol.     

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.     

Regulation of Thy-1 Gene Expression by the Methylation of the 5' Region of Thy-1 Gene and Intracellular Regulatory Factors in Immature B Cells

In cμ^- B220⁺ Thy-1^- FL2-52-2, an immature B cell line transformed with a temperature-sensitive mutant of Abelson murine leukemia virus(ts OS-59), Thy-1 antigen expression was induced after the shift of the culture temperature from a permissive (35' C) to a non-permissive temperature (39' C), and a Thy-1⁺ subclone, FL2-52-2-1 was isolated by limiting dilution. Furthermore, since a population of Thy-1⁺FL2-52-2-1 lost Thy-1 antigen expression during culture at a non-permissive temperature, Thy-1^- FL2-52-2-1-1 was isolated from the cultured cells. Methylation analysis by Southern blotting experiments showed that 5' region of the Thy-1 gene was methylated in Thy-1^- FL2-52-2 but demethylated in Thy-1⁺ FL2-52-2-1 and Thy-1^- FL2-52-2-1-1. To determine whether or not there exist intracellular regulatory factors responsible for Thy-1 gene expression, Thy-1^- allele was transfected into Thy-1^- (Thy-1.2^-) FL2-52-2 and Thy-1^- FL2-52-2-1-1. The transfected Thy-1^- allele was expressed in Thy-1^- FL2-52-2, but not in Thy-1^- FL2-52-2-1-1, indicating the presence of the intracellular regulatory factors requisite for Thy-1 gene expression in Thy-1^- FL2-52-2. It appeared that in Thy-1^- FL2-52-2-1-1, Thy-1 gene was not expressed because of the abscence of the intracellular regulatory factors although the 5' region of the Thy-1 gene was demethylated. These results indicated the existence of at least two regulatory mechanisms of Thy-1 gene expression in immature B cells: methylation of the 5' region of the Thy-1 gene and intracellular regulatory factors.     

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-486对胶质瘤干细胞的抑制作用

背景：既往研究发现,miR-486在胶质瘤干细胞(CD133⁺)中的表达水平显著低于其在胶质瘤非干细胞(CD133^-)中的表达水平,但是miR-486对CD133⁺细胞的影响尚不明确。 目的：探索miR-486对CD133⁺细胞的作用。 方法：利用流式细胞分选将U87胶质瘤细胞中分为CD133⁺和CD133^-细胞。通过脂质体转染构建miR-486过表达的胶质瘤干细胞。 结果与结论：流式细胞分选和纯化获得高比率的CD133⁺胶质瘤干细胞。实时反转录PCR检测发现miR-486在CD133⁺胶质瘤干细胞的表达水平比CD133^-胶质瘤细胞明显下降。脂质体转染成功构建miR-486过表达的胶质瘤干细胞,体外实验发现miR-486高表达抑制胶质瘤干细胞的增殖,将其阻滞于G₁/S期,并促进凋亡。提示miR-486对胶质瘤干细胞具有抑制作用。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     

Effect of the Immune Modulators BM 12.531 (Azimexone) and BM 41.332 on the Subsets of T-Lymphocytes in Mice

The immunomodulating 2-cyanaziridine derivatives BM 12.531 (azimexone) and BM 41.332 have no effects on the total amount of T-lymphocytes in the spleen of mice but ingrease dose-dependently the percentage of Ly1^--, 2⁺, 3⁺ T-lymphocytes (killer/suppressor) and decrease the percentage of Ly1⁺, 2^--, (helper) cells. These investigations were carried out by means of specific monoclonal antibodies and fluoreqcence-activated cell sorting. The increase in Ly2⁺-cells is mainly due to increased suppressor activity.     

“Nk-Like” T Cytotoxicity Against B Lymphocytes in a Hypogammaglobulinemic Patient

Physiologically, cells with NK activity appear to exert a negative control on immunoglobulin production. The clinical association of large granular lymphocyte (LGL) proliferation with hypogammaglobulinemia suggests that these functional NK cells could also be involved in pathological situations.

We studied in vitro lymphocyte functions in a patient presenting LGL proliferation associated with hypogammaglobulinemia. The CD3⁺ CD8⁺ CD57⁺ CD16^- phenotype lymphocytes expressed a high NK type cytotoxicity towards K562 targets, suggesting that they may be considered as “NK-like” T cells. We cultured the patient peripheral blood mononuclear cells (PBMC) with control subject PBMC and with PBMC from two other subjects with B chronic lymphocytic leukemia (B- CLL) of the CD20⁺ CD21^- CD10^- phenotype. Patient PBMC exhibited a lytic activity on control PBMC and on the B lymphocytes of one of the two B- CLL but only in the presence of PWM. This activity was not exerted by the culture supernatant and required a cell - to - cell contact. We suggest that the hypogammaglobulinemia observed in this patient may be related to a cytotoxic effect exerted on B lymphocytes by a CD3⁺ CD8⁺ CD57⁺ CD16^- LGL proliferation.     

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...     

Bone Marrow Stroma-Dependent Modulation of CD45R Isoform Expression on Abelson Virus Transformed Pre-B Cells

The CD45 glycoprotein family exhibits cell-lineage-associated structural heterogeneity which is due, in part, to alternative pre-mRNA splicing. The Abelson murine leukemia (A-MuLV) preferentially transforms immature B cells that express a B-cell-specific high molecular weight CD45 isoform, called B220. However, we observed that A-MuLV-transformed cell lines are often B220^- while maintaining high levels of “pan” CD45 expression. In vitro transformation of murine bone marrow revealed that the stromal microenvironment over which A-MuLV-transformed lymphoblasts are grown affected the B220 phenotype of the pre-B cells. Over a period of a few weeks, B220⁺ populations grown over a clonal stromal cell line gradually became B220^-. However, the transition from a B220⁺ to B220^- phenotype was dependent on the lot of fetal calf serum used. In contrast, cells grown over a heterogeneous bone marrow stroma maintained B220⁺ expression for long periods of time. The appearance of B220^- cells in clonal B220⁺ populations indicated that the change in phenotype resulted in part from modulation of B220 expression. B220^- B-cell lines did not express the high molecular weight CD45 RNA species indicating that the B220^- phenotype was due to alternative pre-mRNA splicing. Finally, the shift from B220⁺ to B220^- was not accompanied by changes in the stage of development of the cultures. These observations demonstrate that expression of B220 is not required for the continued proliferation of Abelson-transformed pre-B cells and is regulated by unknown environmental factors.     

磁珠分选U251细胞系中的CD133+细胞及其生物学特性

背景：脑肿瘤干细胞理论认为,脑肿瘤干细胞是脑肿瘤细胞中“种子”细胞,是脑肿瘤发生、浸润和复发的关键细胞。 目的：观察人多形性胶质母细胞瘤U251细胞系中CD133⁺细胞的增殖、分化及体内致瘤性等生物学特性。 方法：运用磁珠分选技术分选U251细胞系中的CD133⁺和CD133^-细胞亚群;MTT法绘制两个亚群细胞的生长曲线;单克隆形成率实验检测2个亚群细胞的增殖能力;免疫荧光检测CD133⁺细胞亚群的多向分化能力;裸鼠移植实验检测2个亚群细胞在裸鼠体内致瘤性的差异。 结果与结论：U251细胞系中只有约4.5%的CD133⁺细胞;分选后的CD133⁺细胞能增殖形成典型的脑肿瘤干细胞球,生长曲线显示CD133⁺细胞增殖能力明显强于CD133^-细胞;单克隆形成率实验显示CD133⁺细胞能形成脑肿瘤干细胞球的细胞比率达到78.5%~92.4%,而CD133^-细胞仅有0.8%~2.4%;CD133⁺细胞能分化为具有GFAP和NeuN成熟表型的肿瘤细胞;CD133⁺的致瘤率为71.42%,而CD133^-细胞无致瘤性。提示U251细胞系中存在少量具有增殖、多向分化与体内致瘤能力的CD133⁺细胞,CD133⁺细胞是符合肿瘤干细胞定义的细胞亚群。     

糖皮质激素对哮喘小鼠CD4~+T细胞中miRNA-155表达调控的研究

目的:探讨糖皮质激素对哮喘小鼠CD4~+ T细胞中微小RNA-155(miRNA-155)表达调控的影响。方法:使用糖皮质激素对卵清蛋白诱导的小鼠哮喘模型进行治疗,观察糖皮质激素对哮喘小鼠肺组织病理学、肺组织及CD4~+ T细胞中miRNA-155表达和支气管肺泡灌洗液(BALF)中细胞因子含量的影响。结果:RT-qPCR结果显示,哮喘小鼠肺组织和脾脏CD4~+ T细胞中miRNA-155表达显著升高,随着接触过敏原时间的增加,CD4~+ T细胞中miRNA-155水平显著升高(P0.01)。HE和PAS染色显示,与对照组相比,模型小鼠肺组织中炎性细胞浸润显著增加,给予糖皮质激素治疗后可明显减轻支气管周围和血管周围炎症,减少增生杯状细胞的黏液分泌。糖皮质激素治疗后哮喘小鼠肺组织中的miRNA-155水平显著降低,CD4~+ T细胞中的miRNA-155水平显著下调。糖皮质激素治疗可抑制哮喘小鼠的脾脏中CD4~+ CD8~-细胞比例的增加,减少哮喘小鼠肺组织中CD4~+ T细胞的聚集。糖皮质激素治疗后BALF中白细胞介素4(IL-4)、IL-5和IL-13水平下降,干扰素γ水平显著增加。结论:糖皮质激素可抑制哮喘小鼠肺组织中CD4~+ T细胞的聚集,并可降低肺组织和脾脏中CD4~+ T细胞的miRNA-155的表达。     

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：