胶质瘤p^27Kipl、bcl-2和PCNA蛋白的表达

目的：探讨胶质瘤p^27Kipl，bcl-2和PCNA蛋白表达与肿瘤恶性程度、细胞增殖活性、凋亡程度的关系。声去采用免疫组化染色S-P法检测66例不同级别的胶质瘤p^27Kipl，bcl-2和PCNA蛋白的表达。结果：在66例胶质瘤甲，p^27Kipl表达18例(27％)，bcl-2表达20例(30％)，PCNA表达51例(77％)。p^27Kipl蛋白表达率随着胶质瘤级别升高而减少．bcl-2蛋白表达率随肿瘤级别升高而相应增加；PCNA表达随胶质瘤级别升高阳性反应强度增加；但Ⅰ、Ⅱ与Ⅲ级和Ⅳ级组间无显著性差异。结论：p^27Kipl蛋白表达的缺失可能与胶质瘤的发生有关；bcl-2基因可能间接抑制细胞凋亡而与胶质瘤的分型、细胞的增殖活性以及潜在的临床行为无直接关系；PCNA的表达与星形胶质细胞瘤的恶性行为有关。     

青蒿琥酯对人乳腺癌MCF-7细胞裸鼠移植瘤的作用及IGF—IR的影响

[目的]观察青蒿琥酯对人乳腺癌MCF-7裸鼠移植瘤生长的作用，并探讨其抑制肿瘤的机制。[方法]建立人乳腺癌MCF-7裸鼠移植瘤模型，给予不同剂量青蒿琥酯治疗并观察其对移植瘤的抑制作用；电镜观察移植瘤细胞形态学改变；流式细胞术检测细胞凋亡率和细胞周期的变化：免疫组化检测移植瘤细胞p53、bcl-2、bax和caspase-3的表达情况，分析它们之间的相关性；Westernblot检测IGF—IR蛋白的表达：[结果]给药12d后，低剂量、高剂量青蒿琥酯组、CTX组和联合给药组抑瘤率分别为（24．39±10．20）％、（40．24±7．02）％、（57．01±5．84）％和（68．29±5．1）％；青蒿琥酯使肿瘤细胞阻滞于G0／G1期而使S期细胞减少；在青蒿琥酯组中，bcl-2的蛋白表达量明显下降，bax、caspase-3蛋白表达上调，p53蛋白表达量与对照组比较无差异：bcl-2／bax及bcl-2／caspase-3表达均呈负相关．IGF-IR蛋白表达下调。[结论]青蒿琥酯可显著抑制乳腺癌MCF-7细胞裸鼠移植瘤的生长，其机制可能与其影响细胞凋亡相关蛋白、诱导凋广、抑制细胞增殖有关．     

隔蛋白7在神经上皮肿瘤中的表达

目的研究隔蛋白7（SEPT7）在神经上皮肿瘤中的表达。方法采用逆转录-聚合酶链反应（RT—PCR）方法检测47例胶质瘤标本以及4个胶质瘤细胞系中SEPT7的mRNA表达水平，以及免疫组化法研究了肿瘤标本以及组织芯片中SEPT7的表达状况。结果胶质瘤中SEPT7的表达水平随肿瘤恶性程度增加而明显降低，低恶度胶质瘤与高恶度胶质瘤的mRNA、蛋白表达水平差异有统计学意义；胶质瘤细胞系TJ905、TJ899未检测到SEPT7的表达，U251、TJ862细胞系中SEPT7表达水平较正常组织显著降低。结论RT—PCR和免疫组化检测表明SEPT7在神经上皮肿瘤中表达下调，可能与肿瘤的发生、发展有关联，值得进一步研究。     

STAT1基因对胶质瘤细胞系U251细胞周期的影响及其机制

 目的 探讨信号转导与转录激活因子1（STAT1）对胶质瘤细胞系U251细胞周期的影响及其机制。方法 利用LipofectamineTM2000转染试剂体外瞬时将pcDNA3.1-STAT1转染入胶质瘤细胞系U251，将细胞分为Mock组（无转染）、空载组（转染pcDNA3.1）和STAT1组（转染pcDNA3.1-STAT1），采用Western blot法检测胶质瘤U251细胞中STAT1表达水平，MTT法检测转染STAT1的U251细胞增殖活性，流式细胞仪检测细胞周期指标，划痕实验检测细胞迁移指标，通过Western blot法检测转染细胞中P53、P21、bcl-2、Caspase-8的表达水平及变化趋势。结果 与Mock和空载组相比，STAT1组中STAT1蛋白表达量明显增高（P<0.05），细胞增殖明显减慢（P<0.05），G₀/G₁期细胞比例明显升高，细胞的迁移能力明显下降； P53、P21、Caspase-8表达明显增强（P<0.05），bcl-2表达明显减弱（P<0.05）。结论 高表达的STAT1对人脑胶质瘤U251细胞具有抑制增殖或促进凋亡的作用，并且STAT1可调控多分子信号转导通路，对脑胶质瘤的发生和发展起到了关键的作用。     

胶质瘤p27Kip1、bcl-2和PCNA蛋白的表达

目的　探讨胶质瘤p2 7Kip1,bcl 2和PCNA蛋白表达与肿瘤恶性程度、细胞增殖活性、凋亡程度的关系。方法　采用免疫组化染色S P法检测 66例不同级别的胶质瘤 p2 7Kip1,bcl 2和PCNA蛋白的表达。结果　在 66例胶质瘤中 ,p2 7Kip1表达 18例(2 7% ) ,bcl 2表达 2 0例 (3 0 % ) ,PCNA表达 5 1例 (77% )。p2 7Kip1蛋白表达率随着胶质瘤级别升高而减少 ;bcl 2蛋白表达率随肿瘤级别升高而相应增加 ;PCNA表达随胶质瘤级别升高阳性反应强度增加 ;但Ⅰ、Ⅱ与Ⅲ级和Ⅳ级组间无显著性差异。结论　p2 7Kip1蛋白表达的缺失可能与胶质瘤的发生有关 ;bcl 2基因可能间接抑制细胞凋亡而与胶质瘤的分型、细胞的增殖活性以及潜在的临床行为无直接关系 ;PCNA的表达与星形胶质细胞瘤的恶性行为有关     

胶质瘤egr-1基因表达水平与其细胞增殖和凋亡关系的研究

目的：探讨胶质瘤细胞egr-1基因表达水平与肿瘤恶性程度、细胞增殖活性及凋亡程度的关系。方法：用原位杂交、原位细胞凋亡检测和免疫组化染色方法观察了73例不同级别的胶质瘤。结果：73例胶质瘤egr-1mRNA和EGR-1蛋白阳性表达率均为100％．这两种阳性肿瘤细胞密度均随肿瘤恶性程度升高而相应增加，不同级别组间比较差异均有显著性（P〈0．01）。73例胶质瘤增殖细胞核抗原（PCNA）阳性肿瘤细胞和凋亡肿瘤细胞检出率均为100％。随肿瘤恶性程度升高，PCNA阳性肿瘤细胞密度增加而凋亡肿瘤细胞密度减少，不同级别组间比较差异均有显著性（心0．05～0．01）。经直线相关分析证实，egr-1mRNA、EGR-1蛋白和PCNA阳性肿瘤细胞密度彼此间均呈显著性正相关（r=0．685～0．999，P〈0．01），前三种阳性肿瘤细胞密度均与凋亡肿瘤细胞密度呈显著性负相关（r=-0．758—0．775，P〈0．01）。结论：egr-1基因表达水平对评价胶质瘤生物学行为有重要参考价值。胶质瘤细胞egr-1基因表达异常增加可能是促进肿瘤细胞增殖和抑制其凋亡的重要因素，并在胶质瘤发生及恶性进展过程中均起重要作用。     

人脑胶质瘤组织中cyclin D1和cyclin E表达的研究

目的 :研究人脑胶质瘤中细胞周期素 (cyclin)D1和cyclinE的表达与肿瘤病理等级的关系。方法 :采用免疫组织化学法检测 5 2例人脑胶质瘤和 8例正常脑组织标本中cyclinD1和cyclinE的表达。结果 :人脑胶质瘤组中有 2 9例cyclinD1的表达。随着胶质瘤病理分级增高 ,高、低恶性度胶质瘤的阳性率和平均标记指数均显著升高 ,两者差异有统计学意义 ,P <0 0 5。cyclinD1与cyclinE的平均标记指数之间呈明显正相关 ,Pearson相关系数r =0 64 4,P <0 0 1。结论 :cyclinD1与cyclinE在胶质瘤中被异常表达 ,是肿瘤发生和恶性转化的重要促进因子。     

云南元宝枫黄酮诱导个旧肺鳞癌细胞YTMLC凋亡的实验研究

目的研究云南元宝枫黄酮对个旧肺鳞癌细胞(YTMLC)凋亡诱导作用及相关基因表达的影响,为开发应用元宝枫黄酮提供实验依据。方法采用四甲基偶氮唑蓝(MTT)比色法检测元宝枫黄酮对YTMLC细胞的生长抑制作用,流式细胞术TUNEL法检测元宝枫黄酮对YTMLC细胞凋亡的影响,RT-PCR检测元宝枫黄酮对YTMLC细胞 p53、p21、bcl-2、bax和caspase-3基因表达的影响。结果元宝枫黄酮作用YTMLC细胞48 h后,IC50为（108.53±8.22）mg/L。流式细胞术显示元宝枫黄酮既可以诱导YTMLC细胞凋亡,也可以引起YTMLC细胞坏死。元宝枫黄酮对p53、p21、bax和caspase-3的基因表达均有明显上调作用;对bcl-2基因表达有下调作用。结论云南元宝枫黄酮可以抑制个旧肺鳞癌细胞(YTMLC)体外生长,引起肿瘤细胞坏死,诱导肿瘤细胞凋亡,其诱导肿瘤细胞凋亡的可能机制是通过上调p53、p21、bax和caspase-3基因的表达,下调bcl-2基因表达。     

人类肝癌发生过程中cyclinD1和CDK4及p16蛋白的表达

目的 研究肝细胞癌（HCC）发生过程中细胞周期调控因子cyclinD1、CDK4和p16蛋白表达及其意义。方法 应用免疫组织化学SP染色法检测正常肝组织、慢性肝炎，肝硬化，癌周肝硬化和肝癌组织中cyclinD1，CDK4和p16蛋白表达。对免疫组化结果进行计算机图象定量分析。结果 cyclinD1，CDK4和p16蛋白的阳性单位（positive unit，PU）和面数密度（area number density，NA）从慢性肝炎（PU分别为39．4、41．0和33．3；NA分别为236．7、272．7和237．4），肝硬化（PU分别为40．8、45．2和43．6；NA分别为313．8，354．6和322．9）癌周肝硬化（PU分别为55．5、59．4和54．4；NA分别为481．9、488．9和432．6）到肝癌（PU分别为59．6、63．7和58．1；NA分别为549．2、587．7和451．3）表达逐渐增强。癌周肝硬化和肝癌组织中cyclinD1、CDK4、p16的表达明显高于慢性肝炎和肝硬化（P值分别为0．034、0．020、0．030、0．007、0．003和0．005）但癌周肝硬化和肝癌组织之间差异无统计学意义，P值分别为0．433、0。535和0．447。慢性肝炎和肝硬化中cyclinD1、CDK4、p16阳性信号主要定位于胞核，而癌周肝硬化和HCC中主要定位于胞质。P16与HCC的分化程度有关，但未发现cyclinD1、CDK4与肿瘤分化程度之间有相关性。结论 cyclin-细胞周期蛋白依赖性激酶（CDKs）．细胞周期蛋白依赖性激酶抑制因子（CKIs）调控网络中，相关调控因子的异常可能参与了HCC的发生、发展。CyclinDl、CDK4的过度表达可能是肝癌发生过程中的早期事件。在HCC的发生过程中p16高表达可能是细胞周期正反馈调控的结果，在HCC的发生中可能属于早期事件，而p16表达下降或缺失可能是肝癌发生过程中的晚期事件。     

吴茱萸碱对神经母细胞瘤SK-N-SH细胞增殖、迁移及侵袭的影响

目的：探讨吴茱萸碱（Evo）是否通过调控lncRNA LINC00858 表达调控神经母细胞瘤SK-N-SH 细胞的增殖、迁移及侵袭。方法：在体外以3、6、12 μmol/L Evo 处理人神经母细胞瘤SK-N-SH 细胞，利用RNA干扰技术分别将si-NC、si-LINC00858转染至SK-N-SH 细胞，将pcDNA、pcDNA-LINC00858 转染至SK-N-SH 细胞并经12 μmol/L Evo 处理，实验分为对照组、Evo 低剂量组、Evo 中剂量组、Evo 高剂量组、si-NC 组、si-LINC00858 组、Evo+pcDNA 组、Evo+pcDNA-LINC00858 组。采用qPCR法检测各组细胞LINC00858 的表达量，MTT、Transwell 实验分别检测细胞的增殖、迁移、侵袭能力，WB 法检测细胞中cyclinD1、MMP-2、 MMP-9和p21 蛋白的表达。结果：与对照组相比，Evo低、中、高剂量组SK-N-SH 细胞中LINC00858 表达均显著降低（均P<0.05），细胞增殖抑制率显著升高、迁移及侵袭细胞数显著减少（均P<0.01），cyclinD1、MMP-2、MMP-9 蛋白表达降低、p21 蛋白表达升高（均P<0.01）。与si-NC 组相比，si-LINC00858 组细胞的增殖抑制率、迁移和侵袭细胞数及相关蛋白表达变化同Evo 低、中、高剂量组。与Evo+pcDNA 组相比，Evo+pcDNA-LINC00858 组细胞的增殖抑制率显著降低、迁移及侵袭细胞数均显著增多（均P<0.01），cyclinD1、MMP-2、MMP-9蛋白表达升高、p21蛋白表达降低（均P<0.05）。结论：Evo 通过下调LINC00858 表达抑制神经母细胞瘤SK-N-SH细胞的增殖、迁移及侵袭。     

反义miR-30a-5p抑制脑胶质瘤生长的体内实验研究

ObjectiveTo study the inhibitory effect of knocking down miR-30a-5p on the U87 human glioma xenograft growth and its possible mechanism. MethodsNude mice bearing subcutaneous U87 human glioblastoma were established and treated with miR-30a-5p antisense oligonucleotides (AS-miR-30a-5p) subcutaneous injection. Tumor size was measured every other day until the observation period ended. Researchers executed the animals after the treatment, stripped tumor tissues and extracted RNA and protein. Real-time PCR were conducted to detect the expression of miR-30a-5p. The histopathological characteristics and proliferation and apoptosis biological characters (including SEPT7, PCNA, cyclinD1, MMP-2, apoptosis related factor P53, bcl-2 and caspase3)were evaluated by HE and immunohistochemical staining, Western blot analysis respectively, and the cell apoptosis was detected by TUNEL method.ResultsIn AS-miR-30a-5p treated group, the tumor growth was delayed and the final tumor volume was smaller than that in the control and scr-ODN treated group (F=7.167, P＜0.05), and the expression of miR-30a-5p was knocked down. The expression of PCNA、cyclinD1 were significantly down-regulated while P53、SEPT7 and caspase3 up-regulated. Apoptotic index was increased significantly. ConclusionAs-miR-30a-5p suppresses the growth of U87 human gliomas xenografts significantly. Malignant phenotype of tumors are reversed to a considerable degree. Therefore, miR-30a-5p can be a candidate for targeted therapy of human glioma.     

Overexpression of SASH1 related to the decreased invasion ability of human glioma U251 cells

The purpose of this study was to investigate the impact of SAM- and SH3-domain containing 1 (SASH1) on the biological behavior of glioma cells, including its effects on cellular growth, proliferation, apoptosis, invasion, and metastasis, and thereby to provide an experimental basis for future therapeutic treatments. A pcDNA3.1-SASH1 eukaryotic expression vector was constructed and transfected into the U251 human glioma cell line. Using the tetrazolium-based colorimetric (MTT) assay, flow cytometry analyses, transwell invasion chamber experiments, and other methods, we examined the impact of SASH1 on the biological behaviors of U251 cells, including effects on viability, cell cycle, apoptosis, and invasion. Furthermore, the effect of SASH1 on the expression of cyclin D1, caspase-3, matrix metalloproteinase (MMP)-2, MMP-9, and other proteins was observed. Compared to the empty vector and blank control groups, the pcDNA3.1-SASH1 group of U251 cells exhibited significantly reduced cell viability, proliferation, and invasion (p?<?0.05), although there was no difference between the empty vector and blank control groups. The pcDNA3.1-SASH1 group demonstrated a significantly higher apoptotic index than did the empty vector and blank control groups (p?<?0.05), and the percentage of apoptotic cells was similar between the empty vector and blank control groups. In addition, the pcDNA3.1-SASH1 group expressed significantly lower protein levels of cyclin D1 and MMP-2/9 compared to the control and empty vector groups (p?<?0.05) and significantly higher protein levels of caspase-3 than the other two groups (p?<?0.05). Cyclin D1, caspase-3, and MMP-2/9 expression was unchanged between the empty vector and blank control groups. SASH1 gene expression might be related to the inhibition of the growth, proliferation, and invasion of U251 cells and the promotion of U251 cells apoptosis.     

Inhibitory effect of caffeic acid phenethyl ester on the growth of C6 glioma cells in vitro and in vivo

Caffeic acid phenethyl ester (CAPE), a component of honeybee propolis, has been reported to hold various biochemical responses. In the preliminary study, we found that CAPE inhibited the growth of C6 glioma cells in a dose dependent and time dependent manner as shown by the results of trypan blue dye exclusion assay and cell proliferation assay. In addition, the cell number percentage of the G0/G1 phase increased to 85% after the treatment with 50 microM of CAPE for 24h. After treatment with CAPE (50 microM) for 6h, it demonstrated that the protein level of hyperphosphorylated pRb decreased, and cyclin dependent kinase inhibitors p21, p27, and p16 were marked up-regulated. The association of CDK2 and cyclin E that affects the CDK2 activity decreased. When C6 cells were grown as xenografts in nude mice, treatment with CAPE (1-10mg/kg; ip) induced a significant dose dependent decrease in tumor growth by evaluating tumor volume and tumor weight. Histochemical and immunohistochemical analysis revealed that CAPE treatment significantly reduced the number of mitotic cells and proliferating cell nuclear antigen (PCNA)-positive cells in C6 glioma. These results suggest that CAPE presents an antitumor potential for glioma by inhibiting the growth of tumor cells.     

The subcellular localization of cyclin dependent kinase 2 determines the fate of mesangial cells: role in apoptosis and proliferation

Apoptosis is closely linked to proliferation. In this study we showed that inducing apoptosis in mouse mesangial cells with ultraviolet (UV) irradiation was associated with increased cyclin A-cyclin dependent kinase (CDK) 2 activity. Inhibiting CDK2 activity with Roscovitine or dominant negative mutant reduced apoptosis. Because apoptosis typically begins in the cytoplasm, we tested the hypothesis that the subcellular localization of CDK2 determines the proliferative or apoptotic fate of the cell. Our results showed that cyclin A-CDK2 was nuclear in proliferating cells. However, inducing apoptosis in proliferating cells with UV irradiation was associated with a decrease in nuclear cyclin A and CDK2 protein levels. This coincided with an increase in protein and kinase activity for cyclin A-CDK2 in the cytoplasm. Translocation of cyclin A-CDK2 also occurred in p53-/- mesangial cells. Finally, we showed that caspase-3 activity was significantly reduced by inhibiting CDK2 activity with Roscovitine. In summary, our results show that apoptosis is associated with an increase in cytoplasmic cyclin A-CDK2 activity, which is p53 independent and upstream of caspase-3. We propose that the subcellular localization of CDK2 determines the proliferative or apoptotic fate of the cell.     

Induction of differentiation by wild-type p53 gene in a human glioma cell line

Wild-type human p53 gene was transfected into the human glioma cell line T-98G. Transfectants were then isolated and characterizedfor growth potential and differentiation phenotype. Growth suppression,overexpression of GFAP, and accumulation in G₁phase were more commonly observed in transfectants than inT-98G cells. p21_WAF1/CIP1 wasoverexpressed in transfectants, and the binding of PCNA and CDK 2 top21_WAF1/CIP1 were increased in transfectants. These results suggested the roles of p21_WAF1/CIP1, PCNA,and CDK 2 in regulation of differentiation in glioma cells and the gene transfer of wild-type p53 may be effective forthe control of glial differentiation in glioma cells.     

Monensin-mediated growth inhibition in acute myelogenous leukemia cells via cell cycle arrest and apoptosis

Monensin, an Na(+) ionophore, regulates many cellular functions including apoptosis. However, there has been no report about the antitumoral effect of monensin on acute myelogenous leukemia (AML). Here, we investigated the antiproliferative effect of monensin on AML cells in vitro and in vivo. Monensin efficiently inhibited the proliferation of all of 10 AML cell lines, with IC(50) of about 0.5 microM. DNA flow cytometric analysis indicated that monensin induced a G(1) and/or a G(2)-M phase arrest in these cell lines. To address the mechanism of the antiproliferative effect of monensin, we examined the effect of monensin on cell cycle-related proteins in HL-60 cells. The levels of CDK6, cyclin D1 and cyclin A were decreased. In addition, monensin not only increased the p27 level but also enhanced its binding with CDK2. Furthermore, the activities of CDK2- and CDK6-associated kinases reduced by monensin were associated with hypophosphorylation of Rb protein. Monensin also induced apoptosis in AML cells including HL-60 cells. The apoptotic process of HL-60 cells was associated with changes in Bax, caspase-3, caspase-8 and mitochondria transmembrane potential (Deltapsi(m)). In particular, monensin (i.p. at a dose of 8 mg/kg thrice weekly) significantly reduced the tumor size of BALB/c mice that were inoculated s.c. with its derived cell line, WEHI-3BD cells (69% growth inhibition relative to control group; p < 0.05). Tumors from monensin-treated mice exhibited increased apoptosis, and these tumor were immunohistochemically more stained with Bax, Fas and p53 antibodies than control tumors. In conclusion, this is the first report that monensin potently inhibits the proliferation of AML cells.     

Monensin inhibits the growth of renal cell carcinoma cells via cell cycle arrest or apoptosis

Previously, we showed that monensin, Na+ ionophore, potently inhibited the growth of acute myelogenous leukemia and lymphoma cells. Here, we demonstrate that monensin inhibited the proliferation of renal cell carcinoma cells with IC50 of about 2.5 micro M. Monensin induced a G1 or a G2-M phase arrest in these cells. When we examined the effects of this drug on ACHN cells, monensin decreased the levels of CDK2, CDK6, cdc2, cyclin A and cyclin B1 proteins. p21 and p27 proteins were increased by monensin. In addition, monensin markedly enhanced the binding of p21 with CDK2 and the binding of p27 with CDK6. Furthermore, the activities of CDK2- and CDK6-associated kinase were reduced in association with hypophosphorylation of Rb protein. Monensin also induced the apoptosis in several renal cell carcinoma cells. Apoptotic process of Caki-2 cells was associated with the changes of Bcl-2, Bcl-XL, caspase-9, caspase-3, caspase-7 proteins as well as mitochondria transmembrane potential (DeltaPsim) loss. Taken together, these results demonstrate for the first time that monensin inhibits the growth of renal cell carcinoma cells via cell cycle arrest or apoptosis.     

Ellagic acid inhibits human pancreatic cancer growth in Balb c nude mice

Ellagic acid (EA) is a polyphenol found in several plants and fruits. The objectives of this study were to examine the molecular mechanisms by which EA inhibits pancreatic cancer growth in Balb C nude mice. PANC-1 cells were injected subcutaneously into Balb c nude mice, and tumor-bearing mice were treated with EA. The expression of Akt, Shh and Notch and their target gene products were measured by the immunohistochemistry and Western blot analysis. Treatment of PANC-1 xenografted mice with EA resulted in significant inhibition in tumor growth which was associated with suppression of cell proliferation and caspase-3 activation, and induction of PARP cleavage. EA inhibited the expression of Bcl-2, cyclin D1, CDK2, and CDK6, and induced the expression of Bax in tumor tissues compared to untreated control group. EA inhibited the markers of angiogenesis (COX-2, HIF1α, VEGF, VEGFR, IL-6 and IL-8), and metastasis (MMP-2 and MMP-9) in tumor tissues. Furthermore, treatment of mice with EA caused a significant inhibition in phospho-Akt, Gli1, Gli2, Notch1, Notch3, and Hey1. EA also reversed epithelial to mesenchymal transition by up-regulating E-cadherin and inhibiting the expression of Snail, MMP-2 and MMP-9. These data suggest that EA can inhibit pancreatic cancer growth, angiogenesis and metastasis by suppressing Akt, Shh and Notch pathways. In view of the fact that EA could effectively inhibit human pancreatic cancer growth by suppressing Akt, Shh and Notch pathways, our findings suggest that the use of EA would be beneficial for the management of pancreatic cancer.     

左旋棉酚对裸鼠人前列腺癌PC-3细胞皮下移植瘤的生长抑制作用

目的:探讨左旋棉酚对裸鼠人前列腺癌PC-3细胞皮下移植瘤的生长抑制作用及其机制.方法:建立裸鼠人前列腺癌PC-3细胞皮下移植瘤模型,将移植瘤裸鼠80只随机分成4组,每组20只,分别为10.0mg/kg、5.0mg/kg、2.5ng/kg左旋棉酚治疗组和对照组,进行疗效分析与组织病理形态学观察,同时检测肿瘤组织内PCNA、bcl-2、caspase-3和caspase-8的表达.结果:左旋棉酚可使人前列腺癌PC-3细胞荷瘤裸鼠存活率提高,肿瘤体积缩小,肿瘤组织坏死明显,PCNA与bcl-2表达减少,caspase-3和caspase-8表达增加,但高剂量左旋棉酚对PC-3荷瘤裸鼠肝脏和肠道有一定毒性.结论:当治疗剂量大于5.0mg/kg时,左旋棉酚可通过增殖抑制和诱导凋亡,明显抑制裸鼠人前列腺癌PC-3细胞皮下移植瘤的生长.     

Elevated expression of solute carrier family 22 member 18 increases the sensitivity of U251 glioma cells to BCNU

Previous studies showed that solute carrier family 22 member 18 (SLC22A18) is involved in tumorigenesis. The aim of this study was to examine the role of SLC22A18 in glioma cells. Glioma U251 cells were transfected with the human SLC22A18 gene. Transfection of the empty vector pcDNA3.1 was used as a negative control. Sensitivity to BCNU was measured by Annexin V staining. The expression of caspase-3 and bcl-2 was determined by immunohistochemistry. The transfection was confirmed by PCR, RT-PCR and Western blotting. Augmented apoptotic cell death was observed in the SLC22A18-transfected cells, compared to the non-transfected cells or cells with the empty vector. Caspase-3 expression increased in U251-SLC22A18 cells, whereas the bcl-2 expression decreased. These results indicated that SLC22A18 has a pro-apoptotic function in glioma cells.