Inhibition of Glioma Cell Proliferation by Neural Stem Cell Factor

Summary Neural stem cells (NSC) have unique differentiation-, proliferation-, and motility properties. To investigate whether they secrete factors that interfere with the proliferation of glioma cells, we grew glioma cells in conditioned medium (CM) obtained from cultures of neurospheres including neural stem / progenitor cells (NSPC) isolated from embryonic (E14)- or adult mouse brain or fetal human brain. 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) and BrdU-labeling assays showed that CM from NSPC (NSPC/CM) contained factor(s) that inhibited the proliferation of glioma cells by 28–87%. Filter-fractionation of NSPC/CM revealed that the 50,000–100,000 nominal molecular weight limit (NMWL) fraction contained the inhibitory activity. On the basis of these observations we transplanted 203G glioma cells and/or NSPC into the intrathecal space of the cisterna magna of mice to investigate whether NSPC interfere with the proliferation of glioma cells in vivo. Mice transplanted with both 203G and NSPC survived significantly longer than did mice transplanted only with 203G. We concluded that NSPC secrete factor(s) that may control glioma cell proliferation.     

Cell Size Following Irradiation in Relation to Cell Cycle

The cell volume of Ehrlich ascites tumour cells was studied following a radiation dose of 5.0 Gy. The cell volume increased 12 to 30 hours after irradiation by about 20 per cent, was normal at about 50 hours, and increased again at 72 hours. In order to explain these changes the composition of the cells in cell cycle was studied. In addition, the cell volume of irradiated cells from the various parts of the cell cycle, separated by centrifugal elutriation, was measured. The changes in the mean cell volume of unseparated cells could be explained by variations in the cell cycle composition of the cell population. Irradiated cells from the various parts of the cell cycle did not deviate from the volume of non-irradiated cells. The cell volume doubled during the cell cycle. This increase was, however, not linear.     

人干扰素对HL60,K562细胞生长及细胞周期的影响

用人干扰素(α和γ)与HL60、K562细胞共同培养后,对细胞生长有不同程度抑制作用。IFN_r对细胞生长抑制作用强于IFN_r,IFN_r和IFN_r联合应用有协同作用,在K562细胞,细胞在细胞周期中的分布也发生改变,G_0/G_1期细胞比例减少,S期细胞比例增高,在HL60细胞则无明显的细胞周期再分布情况。提示细胞在S期的堆积是细胞生长受抑的原因之一。     

晚期非小细胞肺癌患者外周血DC亚型与 NK细胞的关系

 目的 探讨非小细胞肺癌患者外周血树突状细胞亚群（DC1/DC2）和机体NK细胞含量之间的关系及其临床意义。方法 采用流式细胞术检测40例肺癌患者外周血DC亚群（CD11c+DC/DC1和 CD123+ DC／DC2）、NK细胞含量及血浆IL 12的浓度， 并以10例健康受试者作为对照。结果 肺癌患者外周血CD11c+DC百分率为（0.66±0.24）％，比对照组（1.38±0.18）％明显降低（P<0.01），CD123+ DC百分率（0.28±0.17）％与对照组（0.27±0.11）％相比， 差异无统计学意义（P＞0.05）；肺癌患者与健康人比较，NK细胞含量及IL 12的浓度均降低（P<0.05）。NSCLC 患者NK细胞的含量与CD11c+百分数及血浆IL 12 浓度均呈正相关（P<0.05），与CD123+百分数呈负相关（P<0.01）。DC各亚型百分率同患者的卡氏评分、化疗史有关联（P<0.01），NK细胞的含量与年龄相关（P<0.05）。结论 非小细胞肺癌患者DC1功能低下，IL 12分泌能力障碍，从而影响了NK细胞的活性。DC亚型与NK细胞含量之间以及它们与临床生物学行为之间都有一定关系。     

Clonal T Cell Proliferation in Patients with Pure Red Cell Aplasia

Among the patients with idiopathic pure red cell aplasia (PRCA) who do not meet the diagnostic criteria of chronic lymphocytic leukemia, there are some cases which suggest an association with clonal T lymphocytic proliferation. The morphological characteristics and responses to treatment revealed two distinct groups among the present 13 patients. The lymphocytes in one group were typical granular lymphocytes of T cell phenotype which were treated effectively with cyclophosphamide rather than cyclosporine. The response to therapy in this group occurred after a perceptible reduction in lymphocyte mass, which took at least 8 weekds.

The lymphocytes in the second group consisted mainly of non-granulated lymphocytes or some granulated lymphocytes with fine and indistinct granules and responded well to cyclosporine therapy. A reduction in lymphocytes mass was not a prerequisite for the development of the remission of red cell aplasia in this group, and responses occurred within 4 weeks. Clonal T cell proliferation was detected in some patients, which raised the possibility of idiopathic PRCA being associated with a clonal proliferation of T cells. Distinguishing lymphocytes in patients with PRCA could potentially be used to plan treatment strategy and assess prognosis.     

长春新碱对鼻咽癌细胞增殖和周期的影响

[目的]探讨长春新碱(VCR)对鼻咽癌CNE鄄2Z细胞增殖和周期的影响。[方法]MTT法检测增殖抑制率和IC50,流式细胞术分析细胞周期。[结果]不同浓度的VCR分别处理细胞24h、48h、72h时,抑制率随浓度的增加和时间的延长而增加,其IC50分别为(2.01±0.26)、(1.59±0.23)、(0.92±0.11)μg/ml,各IC50间的差异有非常显著性意义(P<0.01)。0.5μg/ml、1μg/ml、2μg/mlVCR分别处理细胞6h、12h、24h时,G0/G1期细胞明显下降,G2/M期细胞明显升高,随时间的延长变化更明显(P<0.01)。[结论]VCR对CNE鄄2Z细胞具有增殖抑制作用,该抑制作用具有剂量和时间依赖性;阻滞细胞于G2/M期,此阻滞作用具有时间依赖性;一定剂量的VCR可能通过阻滞CNE鄄2Z于G2/M期而抑制其增殖。     

环状核糖核酸调节肾透明细胞癌生物学行为的研究进展

肾细胞癌作为十种多发癌症之一,其发病率与死亡率二十多年来一直在增加。肾透明细胞癌（ccRCC）是其最常见的组织病理学亚型。环状核糖核酸（CircRNAs）是一种非编码核糖核酸,分布广泛,细胞功能多样化,并有器官及组织特异性表达模式。最近研究表明,CircRNAs在ccRCC中异常表达,作为其发生与发展的重要调节因子。目前CircRNAs调节ccRCC生物学行为的相关研究及机制较少。因此,本文主要就CircRNAs调节ccRCC生物学行为的研究进展进行叙述,并讨论其作为ccRCC早期诊断与预后的生物标志物及靶向治疗方面的潜力。     

人SCF基因转染NK细胞系的生物学特性研究

目的；研究SCF基因转染NK细胞系的生物学特性。方法：利用LipofecTAMINE将SCF真核表达载体pcDNA3-hSCF转染NK－92细胞系，RT－PCR鉴定表达SCF的细胞克隆并以SCF依赖细胞株TF－1激活，MTT法检测增殖和杀伤活性。流式细胞术检测细胞表面分子CD3，CE16和CD56。结果：建立表达hSCF基因的NK－92－hSCF细胞株，在IL－15培养条件下，其增殖能力显著高于NK－92，并且低剂量的IL－15可以维持其较高的杀伤活性流式细胞术检测细胞表面分子CD3，CD16和CD56。结论：可以通过SCF基因修饰NK－92，改变其生物学特性，提高其增殖能力，使NK细胞系有更实用的应用价值。     

胃癌癌周淋巴结网膜及腹膜中T淋巴细胞亚群和NK细胞分布的研究

目的:通过检测胃癌、癌周正常胃粘膜、胃周淋巴结、大网膜、小网膜、腹膜及外周血中T淋巴细胞亚群和NK细胞数以探讨胃癌局部及全身的免疫状况.方法:利用流式细胞术测定40例胃癌患者的癌组织、癌周正常胃粘膜、胃周淋巴结、大网膜、小网膜、腹膜及外周血的CD4 、CD8 及NK细胞的含量.取22例良性疾病患者的胃粘膜和外周血做对照.结果:CD4 、CD8 、NK细胞计数在胃癌组织和胃周淋巴结中最高,均高于癌周正常胃粘膜、大网膜、小网膜、腹膜及外周血(P＜0.05),但癌组织的CD4 /CD8 比值低于淋巴结和大网膜(P＜0.05);良性疾病对照组的胃粘膜、外周血CD4 、CD8 、NK细胞计数和CD4 /CD8 比值均高于胃癌患者(P＜0.01).结论:胃癌患者局部及全身的免疫功能均低于对照组;胃癌组织内CD4 、CD8 、NK细胞较癌周正常胃粘膜、大网膜、小网膜、腹膜高聚集,但免疫功能呈现低下和抑制状态.     

Spontaneous Follicular Center Cell Lymphomas of B Cell Origin in Cataract Mice

Spontaneous lymphomas from a strain of hereditary cataract (CAC-nct/+) mice were examined by light and electron microscopy and by immunohistochemical reaction for the mouse heavy and light immunoglobulin chains. Lymphomas occurred in 28 out of 45 male cataract mice and in 34 out of 52 females at 25 to 65 weeks of age. All of the lymphoma-bearing mice showed an enlargement of the spleen and mesenteric lymph nodes, and some mice also had hepatomegaly. Morphologically, all tumors were composed of a mixed population of small and large cells. Neoplastic cells had features of follicular center cell lymphomas, such as scant to moderate amounts of cytoplasm and cleaved and/or round nuclei with a large nuclear-to-cytoplasmic ratio. Large cells were often admixed with small cells, and had vesicular nuclei with prominent nucleoli juxtaposed to the nuclear membrane. Intracytoplasmic eosinophilic inclusions were observed in occasional cells, but Golgi apparatus was poorly developed and rough-surfaced endoplasmic reticulum was scant, unlike those in plasma cells. C-particles were seen in all lymphoma-bearing mice by electron microscopy. Intracisternal A-particles were detected in some mice. Immunohistochemically, neoplastic lymphoid cells were positive for the kappa light chain and the surface/cytoplasmic immunoglobulin M. These results indicate that lymphoid cell neoplasms found in hereditary cataract mice originate from follicular center B cells.     

力尔凡对晚期非小细胞肺癌化疗的影响

比较全身化疗加或不加力尔凡对晚期非小细胞肺癌(NSCLC)的疗效、不良反应及免疫功能的变化。方法:将60例晚期NSCLC患者以随机方法(开信封)分别分为并用力尔凡组(治疗组)和单用化疗组(对照组),分别接受NP方案(诺维苯、顺铂)加力尔凡或单用NP方案化疗。结果:1)治疗组部分缓解率43.3%,对照组33.3%(P>0.05),中位缓解期分别为4.8个月及3.3个月。2)治疗组疗后和疗前相比CD4及CD4/CD8值显著升高(P<0.05),而对照组则相反,两组差异显著(P<0.05)。3)不良反应:治疗组白细胞下降63.3%,对照组达100%(P<0.05)。结论:力尔凡与化疗同时应用治疗晚期NSCLC,疗效有所提高,可增强细胞的免疫功能,对化疗引起的白细胞下降有保护作用。     

姜黄素对人舌鳞癌Tca8113细胞周期的影响

目的探讨不同浓度姜黄素对人舌鳞癌Tca8113细胞周期分布的影响。方法将Tca8113细胞培养于含有不同浓度姜黄素(0、20、40μmol/L)的RPM I-1640培养基中进行培养至规定时间终止培养,流式细胞仪分析细胞周期变化。结果随着姜黄素浓度的升高与作用时间的增加,其对细胞抑制作用明显增强,细胞周期中G0/G1期细胞比例逐渐增加,由46.20%上升至64.80%,S期细胞比例由53.10%下降至31.40%,不同浓度、不同时间对细胞G0/G1期的阻滞作用比较差异有统计学意义(P<0.05)。结论姜黄素能明显改变Tca8113的细胞周期分布,有明显G0/G1期阻滞作用,并有量-效、时-效关系。     

CD248在肾透明细胞癌中的表达及临床意义CSCD

目的探讨内皮唾酸蛋白(CD248)在肾透明细胞癌(ccRCC)组织中的表达及临床意义。方法收集115例ccRCC组织及对应癌旁组织的石蜡标本,同时收集其中17例ccRCC组织及对应癌旁组织的新鲜标本。qRT-PCR检测17例ccRCC组织及对应癌旁组织中CD248 mRNA的表达;免疫组织化学法检测115例ccRCC患者石蜡标本的CD248蛋白水平,分析CD248表达与ccRCC临床病理指标及预后的相关性。结果ccRCC组织中的CD248阳性表达免疫组织化学反应强度显著强于癌旁组织,差异有统计学意义(P=0.0061),且CD248蛋白阳性信号定位于细胞核及细胞质。CD248 mRNA在癌旁组织中的表达水平明显低于ccRCC组织(P=0.0026)。CD248高表达组组间总生存率明显低于CD248低表达组(44.4 vs.57.2月,P=0.017)。结论CD248的表达可能参与ccRCC的发生发展。与癌旁组织比较,CD248在ccRCC组织中高表达;CD248高表达的ccRCC患者术后生存时间较短。     

肾细胞癌免疫治疗的研究进展

肾细胞癌（renal cell carcinoma, RCC）是成年男性常见的恶性肿瘤, 其发病率和死亡率排名均较前。免疫治疗能够激活机体免疫系统产生对肿瘤的反应使疾病稳定,但高剂量不良反应限制了其在临床的广泛应用。而靶向药物的兴起让肾癌患者治疗方式向靶向治疗转变。随着对肾癌临床治疗方式的不断深入研究,发现单纯的免疫或靶向治疗难以得到令人满意的疗效。因此有学者提出肾细胞癌的治疗应该向免疫联合靶向治疗方向转变。本文旨在对当前肾细胞癌相关免疫治疗的临床研究作一综述,以期为临床肾细胞癌的免疫治疗提供一定的理论依据。     

二烯丙基二硫对人结肠癌HT-29细胞周期的阻滞作用

[目的]探讨二烯丙基二硫(DADS)对人结肠癌HT-29细胞周期的阻滞作用及其分子机制.[方法]应用MTF法及细胞计数法测量HT-29细胞生长抑制,流式细胞术检测细胞时相分布,免疫细胞法测定p21、C-myc、Cyclin E表达.[结果]MTT法显示,不同浓度DADS作用HT-29细胞12、24、48h后,细胞生长抑制率及细胞群体倍增时间呈浓度、时间依赖性增加.流式细胞仪分析,30、60pmol/LL DADS阻滞HT29细胞在G1期,与对照组相比,可使G1期细胞增加约2倍,而90、120μmol/L DADS显著地将细胞阻滞在G2/M期.免疫细胞化学分析表明在细胞周期阻滞的同时有p21wafl蛋白表达上调,Cyclin E、C-myc蛋白表达下降.[结论]DADS对HT-29细胞的抑制增殖作用可能与细胞周期阻滞有关,DADS对HT-29细胞周期阻滞的分子机制可能与调节p21wafl、Cyclin E、C-myc表达相关.     

GW843682X对鼻咽癌细胞周期和凋亡的影响

[目的]研究GW843682X对鼻咽癌5-8F细胞周期和凋亡的影响。[方法]培养鼻咽癌5-8F细胞,0、6.25、12.5、25、50、100、200和400nmol/L的GW843682X处理后,用CCK8试剂检测药物对细胞增殖的影响。分别以0、250,500,1000nmol/L的GW843682X处理5-8F细胞48h后,用PI单染流式细胞仪检测药物对5-8F细胞周期的影响。用Annexin V-FITC双染细胞后,经流式细胞仪检测细胞凋亡的变化。[结果]CCK8比色结果显示,GW843682X能抑制鼻咽癌5-8F细胞的增殖,当药物浓度大于50nmol/L时,细胞增殖显著受抑。细胞周期检测结果显示,与阴性对照组比较,GW843682X增加了G2/M期细胞阻滞,减少了G0/G1期细胞比例（P〈0.05）。细胞凋亡检测结果显示,与对照组相比,随着GW843682X浓度的增加,凋亡细胞所占比例逐渐增大,当药物浓度达到500nmol/L和1000nmol/L时,凋亡细胞所占比例显著增加（P〈0.05）。[结论]GW843682X能够显著抑制鼻咽癌5-8F细胞的增殖,可以诱导细胞阻滞于G2/M期,其诱导5-8F细胞凋亡呈一定的剂量依赖性。     

细胞分裂与癌发生机制研究进展

基于肿瘤病理及流行病学的长期观察,结合细胞生物学新成就,发现常见肿瘤发生与细胞分裂潜能关系密切。细胞分裂是个体生长发育及组织损伤后再生修复时必不可少的生物学行为,由于细胞分裂潜能是有限的,频繁分裂将使局部细胞的分裂潜能提前耗竭,籍此发生的细胞重新选择为细胞永生化、恶性变创造了条件。     

气功外气对人早幼粒白血病细胞株HL—60杀伤作用及对正常非洲猴肾上皮细胞的影响

本文为观察气功外气对癌瘤细胞的作用,选用了人早幼粒细胞株及正常非洲猴肾上皮细胞作为靶细胞。该两株细胞株又各自分为二组,气功治疗组与空白对照组。观察结果表明:受外气作用的HL-60细胞株有明显的被杀伤效应(P<0.01),而同步受外气作用的正常非洲猴肾上皮细胞不受影响(P>0.05)。