Inhibitory effect of Cyrtomium falcatum on melanogenesis in α-MSH-stimulated B16F10 murine melanoma cells

Objective:To explore the anti-melanogenic potential of Cyrtomium falcatum.Methods:The effects of Cyrtomium falcatum crude extract and its solvent fractions on tyrosinase activity,melanin content,and the expressions of melanogenesis-related genes and proteins were analyzed inα-melanocyte-stimulating hormone(α-MSH)-stimulated B16F10 cells.Results:α-MSH treatment significantly increased tyrosinase activity,and extracellular and intracellular melanin content,as well as the expression levels of tyrosinase,microphthalmia-associated transcription factor(MITF),tyrosinase-related protein(TRP)-1,and TRP-2 in B16F10 cells.Treatment with Cyrtomium falcatum crude extract and its solvent fractions reduced tyrosinase activity and extracellular and intracellular melanin content and downregulated the expression levels of tyrosinase,MITF,TRP-1,and TRP-2 in a dose-dependent manner.Conclusions:Cyrtomium falcatum has potential anti-melanogenesis effects and can be used as a potential source material in cosmeceutical industry for the research and development of novel lead molecules with whitening properties.

Ultrastructural Pathology of Nerve Cells in Mouse Brain Infected with Epidemic B Encephalitis Virus

An animal model of epidemic(Japanese)B encephalitis was estabilisged by injecting theJin Wei Yah 1 stain of B encephalitis virus into the peritoneal cavity of mice.The ultrastructuralchanges of the nerve cells in their brains were studied,special attention being paid to some types ofnerve cell in the cerebellar cortex.The infectet Purkinje cells and especially the granular cells showedspecial and inter,sting pathological features.These were compared with the changes found in the in-fected nerve cells in the cerebral cortex,diencephalon and mesencephalon.A radiating structure consisting of a microveside-microtubule aggregation body at the centerand endoplastic reticulum or virus replication multivesicular structures around it was often found in thein fected nerve cells.Its morphological features were described in detail,and its significance and the se-quenoe of events of its development discussed.In the late stage of infection,virus particles were found in the nuclei of part of the necroticcells.It is considered that they entered the nuclei from the cytoplasm during or after the death of theinfected cells.The observation smade in this study have comfimed in the granular cell of the cerebellum theidea of Chert et al.that the encephalitis B virus particle can he formed in the perinudear cistem ofthe infected nerve cell,and have brought forth further information in this respect.The way of releaseof the virus particles from the infected nerve cells observed in this study is fundamentally consistentwith that observed by Chen et al.but most of the virus particles left the nerve cell via the cell pro-

Mushroom Tyrosinase Inhibition and Antimelanogenesis Activities of <i>Bacopa monnieri</i>(L.) Methanol Extract in B16F10 Melanoma Cells

Melanocytes that form stratum basale of skin epidermis express tyrosinase enzyme, which catalyzes initial two rate-limiting steps in the biotransformation of tyrosine into dark pigment called melanin. Even today, Tyrosinase inhibitors are among the promising candidates in cosmetic industry for skin-lightening formulations. Overexpression of tyrosinase causes excess melanin biosynthesis and deposition resulting in dark skin color. Moreover, localized overexpression of tyrosinase cause variety of hyperpigmentation disorders like melanoma, melasma, chloasma, dark patches, liver patches, etc. There has been a renewed interest in the natural products as main ingredients in the formulation of safe products for skin-whitening and treatment options for hyperpigmentation disorders. In the present communication, the results of our investigations on tyrosinase inhibition, modulation of intracellular tyrosinase and melanin levels in cultured B16F10 melanoma cells by Bacopa monnieri (L.) methanol extract (BME) are presented and discussed as safe option for skin lightening and to treat hyperpigmentation disorders. BME showed 11%, 29%, 54% and 80% inhibition of mushroom tyrosinase activity at an initial 100, 200, 400 and 600 μg of extract. Treatment of α-melanocyte stimulating hormone (α-MSH) stimulated cultured murine melanoma B16F10 cells with 100 μg/ml of the extract showed a decrease in the levels of cellular melanin and cellular tyrosinase content by 22% and 46% respectively. The cytotoxicity studies by MTT assay revealed that the LC50 of the BME is ≥1000 μg/ml in cultured mouse melanoma B16F10 and HEK293 cells.

Gastrointestinal B-cell lymphomas:From understanding B-cell physiology to classification and molecular pathology

The gut is the most common extranodal site where lymphomas arise. Although all histological lymphoma types may develop in the gut, small and large B-cell lymphomas predominate. The sometimes unexpected finding of a lymphoid lesion in an endoscopic biopsy of the gut may challenge both the clinician (who is not always familiar with lymphoma pathogenesis) and the pathologist (who will often be hampered in his/her diagnostic skill by the limited amount of available tissue). Moreover, the past 2 decades have spawned an avalanche of new data that encompasses both the function of the reactive B-cell as well as the pathogenic pathways that lead to its neoplastic counterpart, the B-cell lymphoma. Therefore, this review aims to offer clinicians an overview of B-cell lymphomas in the gut, and their pertinent molecular features that have led to new insights regarding lymphomagenesis. It addresses the question as how to incorporate all presently available information on normal and neoplastic B-cell differentiation, and how this knowledge can be applied in daily clinical practice (e.g., diagnostic tools, prognostic biomarkers or therapeutic targets) to optimalise the managment of this heterogeneous group of neoplasms.

百合主要有效成分对小鼠B-16细胞黑色素含量、酪氨酸酶活性的影响

目的观察百合多糖与百合皂苷对小鼠B-16细胞中细胞活力、酪氨酸酶活性及黑色素含量的影响。方法选用同一传代小鼠B-16细胞并随机分为空白细胞组、空白对照组、熊果苷组、百合多糖组、百合皂苷组,共5组。空白细胞组加入180μL RPMI1640培养液;空白对照组加入180μL RPMI1640培养液和20μL高密度聚乙烯;熊果苷组、百合多糖组、百合皂苷组分别加入不同浓度(0.2、0.4、0.6、0.8 mg/mL)的熊果苷、百合多糖、百合皂苷,作用3 d后,用CCK-8法检测B-16细胞活力,用酪氨酸酶-多巴速率氧化法检测B-16细胞中酪氨酸酶的活性,以MTT法检测小鼠B-16细胞的黑色素含量。结果与空白细胞组比较,0.8 mg/mL熊果苷组细胞活力明显升高(P<0.01),0.4、0.6、0.8 mg/mL百合皂苷组细胞活力均明显降低(P<0.05,P<0.01);各浓度熊果苷、百合多糖组和0.6、0.8 mg/mL百合皂苷组酪氨酸酶活性均明显降低(P<0.01),0.2 mg/mL百合皂苷组酪氨酸酶活性明显升高(P<0.01)。与空白对照组比较,0.8 mg/mL熊果苷组细胞活力明显升高(P<0.01),0.6、0.8 mg/mL百合皂苷组细胞活力均明显降低(P<0.01);各浓度熊果苷、百合多糖组和0.6、0.8 mg/mL百合皂苷组酪氨酸酶活性均明显降低(P<0.01),0.2、0.4 mg/mL百合皂苷组酪氨酸酶活性均明显升高(P<0.01)。与0.2 mg/mL熊果苷组比较,0.8 mg/mL熊果苷组细胞活力、0.2 mg/mL百合皂苷组酪氨酸酶活性均明显升高(P<0.01)。与0.4 mg/mL熊果苷组比较,0.8 mg/mL熊果苷组细胞活力、0.4 mg/mL百合皂苷组酪氨酸酶活性均明显升高(P<0.01)。与0.6 mg/mL熊果苷组比较,0.6 mg/mL百合皂苷组酪氨酸酶活性均明显升高(P<0.01)。与0.4 mg/mL百合皂苷组比较,0.6、0.8 mg/mL百合皂苷组细胞活力均明显降低(P<0.05,P<0.01)。与0.6 mg/mL百合皂苷组比较,0.8 mg/mL百合皂苷组细胞活力明显降低(P<0.01)。在0.2、0.4 mg/mL浓度下,百合皂苷组酪氨酸酶活性均明显高于百合多糖组(P<0.01)。结论相较于百合皂苷、熊果苷,百合多糖能够在不影响小鼠B-16细胞活性的情况下,对B-16细胞内酪氨酸酶活性和黑色素含量起到抑制作用,推测百合多糖可能通过抑制细胞内酪氨酸酶的活性,进一步抑制黑色素的合成,达到美白的效果。

乳腺癌患者病理特征与Bcl-2、CXCL13、PAX8表达情况的关系分析

目的分析乳腺癌患者病理特征与B细胞淋巴瘤/白血病-2基因(Bcl-2)、趋化因子配体13(CXCL13)、配对盒基因8抗体(PAX8)表达情况的关系。方法收集2021年1月至2023年1月该院收治的160例乳腺癌患者临床资料。采用免疫组化法对其癌组织与癌旁组织Bcl-2、CXCL13、PAX8表达情况进行检测,并分析3项指标与患者病理特征的关系。结果与癌旁组织比较,癌组织Bcl-2、CXCL13、PAX8阳性率更高,差异有统计学意义(P<0.05)。与雌激素受体(ER)阴性、肿瘤最大径≥3 cm、孕激素受体(PR)阴性患者比较,ER阳性、肿瘤最大径<3 cm、PR阳性患者中Bcl-2高表达占比更高,差异有统计学意义(P<0.05);与无淋巴结转移、Ⅰ~Ⅱ期患者比较,淋巴结转移、Ⅲ~Ⅳ期患者中CXCL13高表达占比更高,差异有统计学意义(P<0.05);与Ⅰ~Ⅱ期、高/中分化、无淋巴结转移患者比较,Ⅲ~Ⅳ期、低分化、有淋巴结转移患者中PAX8高表达占比更高,差异有统计学意义(P<0.05)。ER、PR表达情况与Bcl-2表达情况呈正相关(P<0.05),肿瘤最大径与Bcl-2表达情况呈负相关(P<0.05);临床分期、淋巴结转移情况与CXCL13、PAX8表达情况呈正相关(P<0.05);分化程度与PAX8表达情况呈负相关(P<0.05)。结论乳腺癌患者Bcl-2、CXCL13、PAX8表达情况对疾病的发生和发展具有明显影响,有望成为评估乳腺癌患者病情严重程度的标志物。

Caspase-9和CMYC在弥漫性大B细胞淋巴瘤中的表达及与患者病理特征和预后的关系

目的探讨半胱氨酸蛋白酶-9(Caspase-9)和细胞性骨髓细胞瘤病病毒癌基因(CMYC)在弥漫性大B细胞淋巴瘤(DLBCL)组织中的表达及其与患者病理特征和预后的关系。方法选取2017年2月至2020年2月周口市中心医院收治的60例DLBCL患者纳入研究,比较DLBCL肿瘤组织及病灶旁正常组织的Caspase-9、CMYC表达水平,分析Caspase-9、CMYC表达与临床病理特征的关系,比较预后良好和预后不良患者的临床病理特征、Caspase-9、CMYC表达水平,采用二元Logistic回归分析DLBCL患者预后不良的影响因素。结果DLBCL患者肿瘤组织中Caspase-9阳性率为43.33%,明显低于正常组织的80.56%,CMYC阳性率为36.67%,明显高于正常组织的13.88%,差异均有统计学意义(P<0.05);Ann Arbor分期Ⅰ~Ⅱ期、国际预后指数(IPI)评分0~2分患者DLBCL肿瘤组织Caspase-9阳性率明显高于Ⅲ~Ⅳ期和3~4分患者,CMYC阳性率低于Ⅲ~Ⅳ期、3~4分患者,差异均有统计学意义(P<0.05);预后不良患者Ann Arbor分期中Ⅲ~Ⅳ期占比、IPI评分中3~4分占比、CMYC阳性表达占比分别为73.08%、65.38%、69.23%,均高于预后良好组的35.29%、32.35%、11.76%,Caspase-9阳性表达占比为23.08%,低于预后良好组的58.82%,差异均有统计学意义(P<0.05);Ann Arbor分期、IPI评分、Caspase-9、CMYC均为影响DLBCL患者预后不良的独立影响因素(P<0.05),其中Ann Arbor分期Ⅲ~Ⅳ期预后不良风险是Ⅰ~Ⅱ期的9.008倍;IPI评分3~4分预后不良风险是0~2分的10.298倍;Caspase-9表达阳性预后不良风险是阴性的0.622倍;CMYC表达阳性预后不良风险是阴性的19.922倍。结论Caspase-9、CMYC异常表达参与DLBCL的进展,与肿瘤恶性程度有关,且Caspase-9、CMYC异常表达是DLBCL预后不良的独立影响因素,对DLBCL预后具有一定的预测价值,可作为预测DLBCL患者预后的参考指标。

肾脏累及的弥漫性大B细胞淋巴瘤患者临床病理特征

目的·探究肾脏累及的弥漫性大B细胞淋巴瘤(diffuse large B-cell lymphoma,DLBCL)患者的临床病理特征,包括临床基本信息、病理特征、基因突变谱与预后相关因素等。方法·回顾性分析2005年7月—2021年11月上海交通大学医学院附属瑞金医院收治的149例肾脏累及的DLBCL患者的临床资料,包括治疗方案、疗效评价及分期等,并采用靶向测序(54个淋巴瘤相关基因)评估患者的基因突变情况。基于患者资料进行生存和预后因素分析。结果·在149例DLBCL肾脏累及的患者中,有87例患者(58.4%)年龄>60岁,121例患者(81.2%)AnnArbor分期为Ⅲ~Ⅳ期,27例患者(18.1%)美国东部肿瘤协作组评分≥2分,121例患者(81.2%)血清乳酸脱氢酶(lactate dehydrogenase,LDH)高于正常上限,111例患者(74.5%)至少存在2个以上淋巴结外器官受累,131例患者(87.9%)国际预后指数≥2分。患者的5年总生存率和5年无进展生存率分别为52.2%和50.4%。在病理特征中,145例患者(97.3%)诊断为非特指型DLBCL。按Hans分型,39例患者(26.2%)属生发中心亚型。在可评估疗效的144例患者中,87例(60.4%)患者取得完全缓解。此外,单因素分析显示:血清LDH升高是肾脏累及的DLBCL患者总体生存时间(P=0.048)和无进展生存时间(P=0.033)的不良预后因素;75例肾脏累及的DLBCL患者的靶向测序显示PIM1(n=23,31%)、MYD88(n=22,29%)、CD79B(n=21,28%)和KMT2D(n=18,24%)存在高频突变,其中CD79B突变与较差的总体生存时间相关(P=0.034)。结论·肾脏累及的DLBCL患者临床特征中血清LDH升高与不良预后有关,基因突变谱中CD79B突变与不良预后有关。

Dysfunction of peripheral blood dendritic cells from patients with chronic hepatitis B virus infection

AIM: To identify the property of dendritic cells (DCs) of peripheral blood monocytes (PBMC) in patients with chronic HBV infection. METHODS: Twenty patients with persistent HBV infection were included in this study, 10 healthy subjects being used as a control group. The peripheral blood mononuclear cells (PBMC) of T cell-depleted populations were incubated and induced into mature dendritic cells in the RPMI-1640 medium in the presence of cytokines GM-CSF, IL-4, FLt-3,TNF-alpha and 100mL.L(-1 )of fetal calf serum for a total of 10-12 days. The expressions of surface markers on DCs were evaluated using flow cytometric analysis. ELISA method was used to determine the cytokine levels of interleukin-12 (IL-12) and IL-10 in the supernatant produced by DCs. For detection of the stimulatory capacity of DCs to T cell proliferation, mytomycin C-treated DC were incubated with allogenic T cells. RESULTS: A typical morphology of mature DCs from healthy subjects and HBV-infected patients was induced in in vitro incubation, but the proliferation ability and cellular number of DCs from HBV-infected patients significantly decreased compared with healthy individuals. In particular, the expression levels of HLA-DR, CD80 (B7-1) and CD86 (B7-2) on DC surface from patients were also lower than that from healthy individuals (0.46 vs 0.92 for HLA-DR, 0.44 vs 0.88 for CD80 and 0.44 vs 0.84 for CD86,P【0.05). The stimulatory capacity and production of IL-12 of DCs from patients in allogenic mixed lymphocyte reaction (AMLR) significantly decreased, but the production level of nitric oxide (NO) by DCs simultaneously increased compared with healthy subjects (86 +/- 15 vs 170 +/- 22 micromol.L(-1), P 【0.05). CONCLUSION: The patients with chronic HBV infection have the defective function and immature phenotype of dendritic cells, which may be associated with the inability of efficient presentation of HBV antigens to host immune system for the clearance of HBV.

oxLDL/β2GPⅠ/aβ2GPⅠ复合物通过TLR4/MyD88/NF-κB途径促进血管内皮细胞血管生成

目的探讨氧化型低密度脂蛋白(oxLDL)/β2糖蛋白Ⅰ(β2GPⅠ)/抗β2糖蛋白Ⅰ抗体(aβ2GPⅠ)复合物对血管内皮细胞增殖、迁移及血管生成的影响及其机制。方法将人脐静脉内皮细胞(HUVEC)培养至对数生长期,分为对照组(正常培养)、oxLDL组(50 mg/L oxLDL)、oxLDL/β2GPⅠ/aβ2GPⅠ组(50 mg/L oxLDL/100 mg/Lβ2GPⅠ/100 mg/L aβ2GPⅠ)和血管内皮生长因子(VEGF)组(100μg/L VEGF)。实时荧光定量PCR(qPCR)法检测血管生成相关因子VEGF、血管内皮钙黏蛋白(VE-cadherin)、基质金属蛋白酶(MMP)-2及MMP-9的基因表达;CCK-8检测细胞增殖;划痕愈合实验和Transwell实验检测细胞的迁移和侵袭能力;基质胶管腔形成实验检测HUVEC的血管生成能力;Western blot法检测Toll样受体4(TLR4)、髓样分化因子88(MyD88)和核因子κB(NF-κB)的蛋白表达。结果与对照组相比,oxLDL/β2GPⅠ/aβ2GPⅠ组细胞增殖活力在处理48 h时增加;此外,与对照组相比,oxLDL/β2GPⅠ/aβ2GPⅠ组细胞迁移及血管生成能力增强,VEGF、VE-cadherin、MMP-2及MMP-9的mRNA水平升高(P<0.05),TLR4和MyD88蛋白水平及p-NF-κB p65/NF-κB p65比值升高(P<0.05)。结论oxLDL/β2GPⅠ/aβ2GPⅠ复合物可能通过TLR4/MyD88/NF-κB通路诱导血管内皮细胞增殖、迁移及血管生成。

非小细胞肺癌患者血清LncRNA FAM138B、miR-105-5p表达与病理特征的关系

目的探讨非小细胞肺癌(NSCLC)患者血清长链非编码RNA序列相似性家族138成员B(LncRNA FAM138B)、微小RNA-105-5p(miR-105-5p)表达与病理特征的预后的关系。方法选取2018年1月至2019年12月收治的110例NSCLC患者为NSCLC组,另选取同期60例体检健康者为对照组,采用实时荧光定量聚合酶链式反应检测血清LncRNA FAM138B、miR-105-5p表达。分析血清LncRNA FAM138B、miR-105-5p表达与NSCLC患者病理特征的关系。StarBase数据库预测LncRNA FAM138B与miR-105-5p的关系。采用Pearson相关性分析NSCLC患者血清LncRNA FAM138B与miR-105-5p表达的相关性,多因素Cox回归分析NSCLC患者预后影响因素,受试者工作特征(ROC)曲线分析血清LncRNA FAM138B、miR-105-5p表达对NSCLC患者预后的预测价值。结果与对照组比较,NSCLC组血清LncRNA FAM138B表达降低,miR-105-5p表达升高(P<0.05)。经StarBase数据库预测,LncRNA FAM138B与miR-105-5p存在互补序列。Pearson相关性分析显示,NSCLC患者血清LncRNA FAM138B与miR-105-5p表达呈负相关(r=-0.770,P<0.001)。不同分化程度、TNM分期、淋巴结转移NSCLC患者LncRNA FAM138B、miR-105-5p表达比较,差异有统计学意义(P<0.05)。110例NSCLC患者3年总生存率为56.36%(62/110)。K-M生存曲线分析显示,LncRNA FAM138B高表达组总生存率高于低表达组,miR-105-5p高表达组总生存率高于低表达组(P<0.05)。多因素Cox回归分析显示,低分化、TNM分期Ⅲ~Ⅳ期、淋巴结转移和miR-105-5p≥1.494为NSCLC患者死亡的独立危险因素,LncRNA FAM138B≥0.871为独立保护因素(P<0.05)。ROC曲线分析显示,血清LncRNA FAM138B、miR-105-5p表达单独与联合预测NSCLC患者预后的曲线下面积分别为0.783、0.779、0.905,二项联合预测的曲线下面积最大(P<0.05)。结论NSCLC患者血清LncRNA FAM138B低表达,miR-105-5p高表达,与分化程度、TNM分期、淋巴结转移和预后有关,可能成为NSCLC患者预后的辅助预测指标。

血清游离轻链和硒水平与B细胞非霍奇金淋巴瘤患者临床病理特征的关系及预后风险模型的构建

目的探讨血清游离轻链(FLC)和硒水平与B细胞非霍奇金淋巴瘤(B-NHL)患者临床病理特征的关系,并构建预后风险模型。方法选取2014年6月—2021年6月宜宾市第一人民医院B-NHL患者164例,作为训练集;另选取82例B-NHL患者作为验证集。收集所有患者的临床资料,并检测血清FLC、硒水平和血常规。对所有患者进行8~108个月随访,随访截止时间为2023年6月。采用Kaplan-Meier生存曲线评估不同血清FLC、硒水平患者的生存情况。采用Cox比例风险回归分析评估影响B-NHL患者无进展生存率和总生存率的因素。采用R软件构建预测B-NHL患者预后的列线图风险预测模型并评价其效能。结果根据B-NHL患者FLC水平是否升高分为低FLC水平(87例)和高FLC水平(77例),低FLC水平与高FLC水平的B-NHL患者之间Ann Arbor分期和B症状差异有统计学意义(P<0.05)。根据血清硒水平的中位数(1.12μmol/L)将所有患者分为低硒水平(82例)和高硒水平(82例),低硒水平与高硒水平的B-NHL患者之间美国东部肿瘤协作组(ECOG)评分差异有统计学意义(P<0.05)。高FLC水平患者和低硒水平患者的无进展生存率、总生存率分别低于低FLC水平患者和高硒水平患者(P<0.01)。多因素Cox比例风险回归分析结果显示,年龄>60岁、国际预后指数(IPI)为3~5分、乳酸脱氢酶(LDH)>250 U·L^(-1)、β2-微球蛋白(β2-MG)>3 mg·L^(-1)、血清硒水平降低是B-NHL患者无进展生存率和总生存率降低的危险因素(P<0.05),血清FLC升高是B-NHL患者无进展生存率降低的危险因素(P<0.01)。预测模型判断B-NHL患者预后不良的曲线下面积为0.856,在训练集和验证集中的准确性、敏感性、特异性相近,稳定性较好(Nagelkerke R2=0.602)。结论高FLC水平与B-NHL患者的Ann Arbor分期和B症状有关,低硒水平与B-NHL患者的ECOG评分有关。基于临床病理特征构建的列线图风险预测模型能较准确地评估B-NHL患者的预后情况。

Exposure of Weak Time-Invariant Electromagnetic Fields to B16-BL6 Cell Cultures Alter Biophoton Emission Profile as a Function of Distance

Biophoton emission is produced by all living systems;this emission pattern has been shown to be altered by the presence of an electromagnetic field (EMF). Cultures of B16-BL6 cells were exposed to a weak EMF produced by a specially constructed EM generator, called the “Resonator”, for one hour. This EM generator incorporates multiple geometric ratios in its design, including the golden ratio (phi), pi, root 2, root 3, and root 5. It has been used previously to purify water of toxins. There was a significant decrease in mean photon counts from B16-BL6 cells exposed at a distance of 1 m compared to those exposed at 0 m. Alterations in the spectral power density variability were also observed in the 8 - 10 Hz range. The EM generator may have an impact on the viability of the exposed cell cultures, but only at specific distances.

三氧化二砷诱导恶性黑色素瘤A_(375)和B_(16)细胞凋亡的研究

目的 :研究不同浓度的三氧化二砷 (As2 O3 )对恶性黑色素瘤人A3 75细胞和小鼠B16细胞的凋亡诱导作用 ,为As2 O3 治疗恶性黑色素瘤提供新的理论和实验依据。方法 :用流式细胞术 (FCM )检测A3 75细胞和B16细胞的凋亡诱导及杀伤作用 :用不同剂量的As2 O3 (0 .1mmol·L-1、0 .2 5mmol·L-1和 0 .5mmol/L-1) ,对小鼠进行腹腔注射 (10ml·kg-1,连续注射 10d后 ,检测小鼠血清与心、肝、肾有关的生化指标。结果 :As2 O3 浓度分别为 5 μmol·L-1、10 μmol·L-1和 2 0 μmol·L-1时 ,A3 75和B16细胞的凋亡率分别为 11.85 %、5 5 .5 1%、5 4 .90 %和 9.81%、2 6 .4 5 %、9.93% :As2 O3 诱导A3 75和B16细胞总的凋亡和坏死率分别为11.90 %、5 5 .71%、5 7.4 0 %和 12 .96 %、2 6 .99%、87.13% ;不同剂量的As2 O3 (0 .1mmol·L-1～ 0 .5mmol·L-1)对小鼠肝、肾和心肌等功能无明显影响 ,与对照组各项指标无显著性差异 (P >0 .0 5 )。结论 :不同浓度的As2 O3 能明显诱导恶性黑色素瘤A3 75及B16细胞凋亡和坏死 ,对A3 75细胞的凋亡诱导作用强于B16细胞。As2 O3 (0 .1mmol·L-1～ 0 .5mmol·L-1)对小鼠肝。

海南文昌清澜港红树林真菌抗B16肿瘤细胞活性菌株的筛选

从海南文昌清澜港红树林采集78份植物组织和土壤样品。对样品进行真菌分离,共分离得到真菌608株,采用目测法对其体外抗肿瘤细胞活性进行检测,发现81株红树林真菌对小鼠黑色素瘤B16细胞有不同程度的抑制作用,占总分离菌株的13.32%。结果表明,从红树植物杯萼海桑中分离得到真菌菌株的数量最多,而从红树植物银叶树分离得到的抗肿瘤细胞活性菌株数量最多。

β-榄香烯对小鼠B_(16)黑色素瘤细胞粘附、运动和间隙连接通讯功能的影响

目的：探讨β揽香烯对小鼠Ｂ１６黑色素瘤细胞粘附和运动能力的影响。方法：采用细胞培养、电镜及划痕染料示踪技术，研究了β榄香烯对小鼠Ｂ１６黑色素瘤细胞粘附与运动能力、间隙连接结构及其间隙连接通讯功能的影响。结果：２０～４０μｇ／ｍｌ的β榄香烯可显著抑制Ｂ１６细胞对纤维结合蛋白和层粘连蛋白两种基质的粘附，抑制Ｂ１６细胞的运动，延迟吸管尖部所致细胞单层损伤的愈合。结论：提示β榄香烯对Ｂ１６细胞粘附和运动能力的抑制可能是其抗肿瘤转移作用的机制之一。

三氧化二砷对黑色素瘤B_(16)细胞端粒酶活性影响

目的 :研究三氧化二砷 (As2 O3 )对黑色素瘤B1 6细胞端粒酶活性的作用 ,探讨砷及其化合物治疗黑色素瘤的作用机制 ,为其治疗黑色素瘤提供新的理论和实验依据。方法 :用TRAP ELISA和TRAP PAGE银染法检测黑色素瘤B1 6细胞 (简称B1 6)端粒酶活性。结果 :As2 O3 对黑色素瘤B1 6细胞端粒酶活性的抑制有明显的浓度和时间依赖关系。结论 :As2 O3 对黑色素瘤B1

丹参素钠对小鼠黑色素瘤细胞B16细胞间缝隙连接的影响

【目的】研究丹参素钠(salvianic acid A sodium,SAAS)对小鼠黑色素瘤细胞株B16细胞间缝隙连接(GJIC)的影响及其机制。【方法】采用四甲基偶氮唑盐(MTT)法检测SAAS对B16细胞生长的影响,荧光显微镜观察及流式细胞仪荧光示踪法结合分析缝隙连接(GJ)功能变化,并与阳性对照药全反式维甲酸(ATRA)比较,采用western blot法分析缝隙连接蛋白Cx32和Cx43的表达。【结果】以0～8μmol/L SAAS处理B16细胞48 h不影响其生存;用0、1、2、4、8μmol/L SAAS处理细胞48 h后,荧光显微镜下观察,SAAS能明显提高B16细胞Calcein传递,流式细胞术分析对照组和试验组的绿色荧光细胞(G4)与双阴性受体细胞(G3)比值(G4/G3)分别是0.10±0.01、0.16±0.02、0.20±0.01、0.21±0.02和0.25±0.02,各试验组G4/G3值显著高于对照组(P<0.01);western blot分析结果显示:用0、1、2、4、8μmol/L SAAS处理细胞48 h能显著提高Cx32、Cx43的表达。【结论】体外较低浓度SAAS能够促进B16细胞细胞间缝隙连接功能,但在一定药物浓度作用后,不能再提高其功能。SAAS促进GJ机制可能是通过上调Cx32、Cx43蛋白表达途径。

湘西龙山百合对小鼠B-16黑色素瘤细胞黑色素含量、酪氨酸酶活性的影响

目的观察不同浓度湘西龙山百合提取液对小鼠B-16细胞细胞活力、黑色素含量、酪氨酸酶活性的影响。方法选用同一传代小鼠B-16黑色素瘤细胞并分组,分别加入不同浓度百合提取液、维生素C二种溶液作用3 d后,用MTT法测定B-16细胞活力;用Maeda等的方法测定B-16细胞酪氨酸酶活性;用Victoria等的方法测定B-16细胞黑色素含量。结果湘西龙山百合提取液对小鼠B-16细胞的酪氨酸酶活性、黑色素合成的抑制作用明显强于维生素C,组间差异有统计学意义(P<0.05),且其抑制作用随浓度的增加而增加;同时湘西龙山百合提取液其细胞毒性作用同样强于维生素C,组间差异有统计学意义(P<0.05)。结论百合提取液对B-16细胞的生长、酪氨酸酶活性和黑色素合成的抑制作用强于维生素C,其抑制作用与浓度呈正相关。

重组CCL2小鼠黑色素瘤B-16细胞的建立及生物学活性的鉴定

目的:在小鼠黑色素瘤B-16细胞中克隆表达趋化因子CCL2,以进一步研究趋化因子与肿瘤的关系。方法:从小鼠腹腔巨噬细胞中提取总RNA,RT-PCR扩增CCL2 cDNA,将此片段重组于真核表达载体pcDNA3.0,脂质体FuGENE6转染鼠黑色素瘤B-16细胞,G-418筛选阳性克隆。结果:RT-PCR和免疫细胞化学鉴定转染B-16细胞中有较强CCL2的表达,体外趋化实验表明重组CCL2有生物学活性。结论:获得有趋化活性的重组CCL2的小鼠黑色素瘤B-16细胞。