Expression of T-STAR gene is associated with regulation of telomerase activity in human colon cancer cell line HCT-116

AIM： To investigate the effects on telomerase activity of transfection of human T-STAR gene full-length sense cDNA or partial antisense cDNA into human colon cancer cell line HCT-116.METHODS： mRNA and protein expression levels of T-STAR gene were determined by RT-PCR and western blot, and telomerase activity was measured by PCR- ELISA, after transfection of T-STAR sense or antisense gene into HCT-116 cells with lipofectamine. RESULTS： T-STAR gene expression was enhanced or knocked down both at mRNA and protein levels, and telomerase activity was significantly increased or decreased. CONCLUSION： The T-STAR gene may participate in regulation of telomerase activity in human colon cancer HCT-116 cells in a parallel fashion.

Epigenetic modification regulates both expression of tumor-associated genes and cell cycle progressing in human colon cancer cell lines: Colo-320 and SW1116

The aim of this study is to assess the effects of DNA methylation and historic acetylation, alone or in combination, on the expression of several tumor-associated genes and cell cycle progression in two established human colon cancer cell lines: Colo-320 and SW1116. Treatments with 5-aza-2'-deoxycytidine (5-aza-dC) and trichostatin A, alone or in combination, were applied respectively. The methylation status of the CDKN2A promoter was determined by methyla-tion-specific PCR, and the acetylated status of the histones associated with the p21WAF1 and CDKN2A genes was examined by chromatin immunoprecipitation. The expression of the CDKN2A, p21WAF1, p53, p73, APC, c-myc, c-Ki-ras and survivin genes was detected by real-time RT-PCR and RT-PCR. The cell cycle profile was established by flow cytometry. We found that along with the demethylation of the CDKN2A gene promoter in both cell lines induced by 5-aza-dC alone or in combination with TSA, the expression of both CDKN2A and APC genes increased. The treatment of TSA or sodium butyrate up-regulated the transcription of p21WAF1 significantly by inducing the acetylation of histones H4 and H3, but failed to alter the acetylation level of CDKN2A-associated histones. No changes in transcription of p53, p73, c-myc, c-Ki-ras and survivin genes were observed. In addition, TSA or sodium butyrate was shown to arrest cells at the G1 phase. However, 5-aza-dC was not able to affect the cell cycle progression. In conclusion, regulation by epigenetic modification of the transcription of tumor-associated genes and the cell cycle progression in both human colon cancer cell lines Colo-320 and SW1116 is gene-specific.

Anti-cancer effect of ethylacetate fraction from Orostachys japonicus on HT-29 human colon cancer cells by induction of apoptosis through caspase-dependent signaling pathway

Objective: To investigate the anti-colon cancer effects of ethylacetate fraction from Orostachys japonicus(0. japonicus) on HT-29 cancer cells. Methods: The viability of HT-29 cells was assayed by the 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2 H-tetrazolium(MTS) method. Apoptosis induction and cell cycle inhibition were confirmed by fluorescein isothiocyanate and propidium iodide staining using flow cytometry.Morphological changes in the nucleus were observed, using a fluorescence microscope with4',6-diamidino-2-phenylindole(DAPI) nuclear staining. The expression levels of the upstream and downstream proteins involved in the anti-cancer mechanism were confirmed by Western blotting. Results: After treating HT-29 cells with different concentrations of ethylacetate fraction from O. japonicus, the viability of cells decreased in a concentration-dependent manner,while apoptosis induction and apoptotic body formation increased. Cell cycle analysis showed that the arrest occurred at the sub-G_1 and S phase. Among the upstream and downstream proteins involved in anti-cancer activity, the level of B cell lymphoma-2 decreased, and the bcl-2-associated x protein increased. The level of pro-caspase-3, pro-caspase-8, and pro-caspase-9 decreased, while the level of cleaved-caspase-3, cleaved-caspase-8, and cleaved-caspase-9 increased. Moreover, the phosphorylation, that is, activation of extracellular signal regulated kinase 1/2, Jun-N-terminal kinase, and p38 increased. Conclusions: Combining the above results, it is thought that the survival of HT-29 cells is suppressed by ethylacetate fraction from0. japonicus through mitochondrial regulation-induced caspase cascade activation, induction of apoptosis and cell cycle arrest.

Interaction between Colon Cancer Cells and Human Liver Sinusoidal Endothelial Cells Promotes Liver Metastasis of Tumor Cells

OBJECTIVE To investigate the effect of co-culture between colon cancer cells （SW1116） and human liver sinusoidal endothelial cells （HLSECs） on cancer cell metastasis, and to provide a novel model for studying the mechanism of colon cancer liver metastasis. METHODS HLSECs and SW1116 were co-cultured for 21 rounds in vitro. Transwell migration, gelatin-zymography, CCK-8 proliferation and colony formation assays were used to examine the invasion, proliferation, and colony forming ability of cancer cells. Assays were carried out to examine tumor growth ability and liver metastasis. The associated molecular change was examined by western blotting. RESULTS After 21 selection rounds, colon cancer cells SWl 1161）21 displayed a clear boundary. Compared with the 5W1116 cells, SW1116P21 cells had a greater invasive ability, cell proliferation and colony formation in soft agar. A gelatin-zymography assay showed that the ability of SW1116P21 cells to secrete matrix metalloproteinase-2/9 was significantly greater than that of SWl116 cells. Additionally, the capacity for subcutaneous tumor formation of SW1116P21 was significantly increased. It was found that mice injected with SW1116P21 cells developed significantly more visually observable liver nodules than mice injected with SW1116 cells. Western blotting showed increased vimentin expression and decreased E-cadherin expression in the SW1116P21 cells, compared with the SWl 116 cells. CONCLUSION The interaction between SW1116 and HLSECs may promote tumor cell invasion, proliferation and colony formation in vitro, and tumor formation and liver metastasis in vivo. An epithelial-mesenchymal transition occurs in SWl 116P21 cells, which contributes to the change in the characteristics of tumor cells.

Pro-apoptotic Effects of OSNQ on Human Colon Cancer SW480 Cells

[Objectives] The aim was to elucidate the pro-apoptosis mechanism of naphthoquinone derivative 2-octyl sulfoxide-1,4-naphthoquinone(OSNQ) on human colon cancer SW480 cells.[Methods]The cytotoxic effect of OSNQ on colon cancer SW480 cells was detected by MTT colorimetry.The pro-apoptotic effect of OSNQ on human colon cancer SW480 cells was detected by Annexin V-FITC/PI double staining.The changes in expression of apoptosis-related proteins were detected by Western blot.[Results]The results of MTT assay showed that OSNQ had a significant cytotoxic effect on colon cancer SW480 cells.The results of Western blot showed that OSNQ induced the apoptosis in colon cancer SW480 cells through promoting the expression of pro-apoptotic caspase-3 and inhibiting the expression of apoptosis-inhibiting protein Bcl-2.[Conclusions] OSNQ has a significant cytotoxic effect on colon cancer SW480 cells,and it induces the apoptosis of colon cancer SW480 cells by AKT signaling pathway.

Role of oncogenic long noncoding RNA KCNQ1OT1 in colon cancer

The role of lncRNA KCNQ1 opposite strand/antisense transcript 1(KCNQ1OT1)in colon cancer involves various tumorigenic processes and has been studed widely.However,the mechanism by which it promotes colon cancer remains unclear.Retrovirnl vector pSEB61 was retroftted in established HCT116 siKCN and SW480-siKCN cells to silence KCNQ1 OT1.Cellular proliferation was measured using CCK8 assay,and flow cytometry(FCM)detected cell cydle changes.RNA sequencing(RNA Seq)analysis showed differentially expressed genes(DEGs).Gene ontology(GO)and Kyoto Encyclopedia of Genes and Genomes(KEGG)pathway enrichment analyses were carried out to analyze enriched functions and signaling pathways.RT-qPCR,immunofluorescence,and western blotting were carried out to validate downstream gene expressions.The effects of tumorigenesis were evaluated in BALB/c nude mice by tumor xenografts.Our data revealed that the silencing of KONQ1OT1 in HCT116 and SW480 cells slowed cell growth and decreased the number of cells in the G2/M phase.RNA-Seq analysis showed the data of DEGs enriched in various GO and KEGG pathways such as DNA replication and cell cyde.RT qPCR,immunofluorescence,and western blotting confirmed downstream CCNE2 and PCNA gene expressions.HCT116 siKCN cells signifcantly suppressed tumorigenesis in BALB/c nude mice.Our study suggests that lncRNA KCNQ1OT1 may provide a promising therapeutic strategy for colon cancer.

Ponatinib and gossypol act in synergy to suppress colorectal cancer cells by modulating apoptosis/autophagy crosstalk and inhibiting the FGF19/FGFR4 axis

Objective:To evaluate the efficacy of ponatinib plus gossypol against colorectal cancer HCT-116 and Caco-2 cells.Methods:Cells were treated with ponatinib and/or gossypol at increasing concentrations to evaluate synergistic drug interactions by combination index.Cell viability,FGF19/FGFR4,and apoptotic and autophagic cell death were studied.Results:Ponatinib(1.25-40μM)and gossypol(2.5-80μM)monotherapy inhibited HCT-116 and Caco-2 cell viability in a doseand time-dependent manner.The combination of ponatinib and gossypol at a ratio of 1 to 2 significantly decreased cell viability(P<0.05),with a>2-and>4-fold reduction in IC50,respectively,after 24 h and 48 h,as compared to the IC50 of ponatinib.Lower combined concentrations showed greater synergism(combination index<1)with a higher ponatinib dose reduction index.Moreover,ponatinib plus gossypol induced morphological changes in HCT-116and Caco-2 cells,increased beclin-1 and caspase-3,and decreased FGF19,FGFR4,Bcl-2 and p-Akt as compared to treatment with drugs alone.Conclusions:Gossypol enhances ponatinib's anticancer effects against colorectal cancer cells through antiproliferative,apoptotic,and autophagic mechanisms.This may open the way for the future use of ponatinib at lower doses with gossypol as a potentially safer targeted strategy for colorectal cancer treatment.

Radiosensitivity of human colon cancer cell enhanced by immunoliposomal docetaxel

AIM:To enhance the radiosensitivity of human colon cancer cells by docetaxel. METHODS: Immunoliposomal docetaxel was prepared by coupling monoclonal antibody against carcinoembryonic antigen to cyanuric chloride at the PEG terminus of liposome. LoVo adenocarcinoma cell line was treated with immunoliposomal docetaxel or/and irradiation. MTT colorimetric assay was used to estimate cytotoxicity of immunoliposomal docetaxel and radiotoxicity. Cell cycle redistribution and apoptosis were determined with flow cytometry. Survivin expression in LoVo cells was verified by immunohistochemistry. D801 morphologic analysis system was used to semi-quantify immunohistochemical staining of survivin. RESULTS: Cytotoxicity was induced by immunoliposomal docetaxel alone in a dose-dependent manner. Immunoliposomal docetaxel yielded a cytotoxicity effect at a low dose of 2 nmol/L. With a single dose irradiation, the relative surviving fraction of LoVo cells showed a dose-dependent response, but there were no significant changes as radiation delivered from 4 to 8 Gy. Compared with liposomal docetaxel or single dose irradiation, strongly radiopotentiating effects of immunoliposomal docetaxel on LoVo cells were observed. A low dose of immunoliposomal docetaxel could yield sufficient radiosensitivity. Immunoliposomal docetaxel were achieved both specificity of the conjugated antibody and drug radiosensitization. Combined with radiation, immunoliposomal docetaxel significantly increased the percentage of G2/M cells and induced apoptosis, but significantly decreased the percentage of cells in G2/G1 and S phase by comparison with liposomal docetaxel. Immunohistochemical analysis showed that the brown stained survivin was mainly in cytoplasm of LoVo cells. Semi-quantitative analysis of the survivin immunostaining showed that the expression of survivin in LoVo cells under irradiation with immunoliposomal docetaxel was significantly decreased. CONCLUSION: Immunoliposomal docetaxel is strongly effective for target radiosensitation in LoVo colon carcinoma cells, and may offer the potential to improve local radiotherapy.

槐果碱对人肠癌细胞HCT-116生长抑制作用

目的探讨槐果碱对人肠癌细胞HCT-116生长的影响。方法选取人肠癌细胞HCT-116,用不同浓度梯度槐果碱作用48 h后,通过细胞毒性试验检测增殖能力,根据IC_(50)选择3个浓度进一步实验。通过平板克隆形成实验检测细胞克隆能力,流式细胞术检测细胞凋亡情况,线粒体膜电位检测线粒体膜电位水平,蛋白质印迹法检测凋亡相关蛋白及生存素(survivin)的表达水平。结果细胞毒性试验显示,槐果碱可抑制HCT-116肿瘤细胞增殖,且随着槐果碱浓度的升高抑制作用增强。IC_(50)为2.134 mmol/L,并选择1、2和4 mmol/L进行进一步相关实验;在槐果碱作用后HCT-116细胞克隆能力、线粒体膜电位水平均明显下降,细胞凋亡率明显升高(P<0.05);槐果碱作用后,HCT-116细胞内Bcl-xL、Bcl-2、survivin表达显著下调,而Bax、Cleaved Caspase-3和Cleaved Caspase-9显著上调。结论槐果碱可抑制肠癌细胞HCT-116增殖并通过线粒体途径促进凋亡。

Identification of an anticancer compound against HT-29 cells from Phellinus linteus grown on germinated brown rice

Objective:To isolate and identify the anticancer compound against proliferation of human colon cancer cells from ethyl acetate(EtOAc)extract ol Phellinus linteus grown on germinated brown rice(PB).Methods:EtOAc extract of PB was partitioned with n-hexane,EtOAc,and water-saturated n-butanol.Anticancer compound of n-hexane layer was isolated and identified by HPLC and NMR,respectively.Cytotoxicity against HT-29 cells was tested by SRB assay.Results:The n-hexane layer obtained after solvent fractionation of PB EtOAc extracts showed a potent anticancer activity against the HT-29 cell line.Atractylenolide I,a eudesmane-type sesquiterpene lactone,a major anticancer substance of PB,was isolated from the n-hexane layer by silica gel column chromatography and preparative-HPLC.This structure was elucidated by one-and two-dimensional NMR spectroscopic data.Atractylenolide I has not been reported in mushrooms or rice as of yet.The isolated compound dose-dependently inhibited the growth of HT-29 human colon cancer cells.Conclusions:Atractylenolide I might contribute to the anticancer effect of PB.

Estradiol agonists inhibit human Lo Vo colorectal-cancer cell proliferation and migration through p53

AIM: To investigate the effects of 17&#x003b2;-estradiol via estrogen receptors (ER) or direct administration of ER agonists on human colorectal cancer.

复方葛根汤诱导结肠癌HCT116细胞铁死亡分子机制研究

为探究复方葛根汤对结肠癌HCT116细胞增长作用及其分子机制,通过MTT法检测、克隆形成、形态学分析探讨复方葛根汤对HCT116细胞增长作用,以活性氧试剂盒检测、荧光显微成像及蛋白免疫印迹法探究其分子机制。研究结果显示,与溶媒对照组相比,复方葛根汤能显著抑制HCT116细胞增长能力,并呈浓度和时间依赖性,机制上能显著增加细胞内活性氧,显著上调铁死亡相关蛋白PTGS2、ACSL4蛋白的表达,及明显下调铁死亡相关蛋白GPX4表达,表明复方葛根汤可能通过诱导铁死亡机制抑制HCT116细胞增长。

Fermented Herbal Decoction Selectively Targeting Human Cancer Cell Line and Human Pathogenic Microorganism

Introduction: Prolonged immuno-suppressed status promised to induce internal growth of malignant cell and infectious agent, yet, only a small part of affected individuals seek medical attention or berried by commercially over-flowed fake information. Several studies have described complementary and alternative medicine as effective strategies for improving anti-infectious agent including malignant cell. The purpose of this study was to investigate the effect of a fermented herbal decoction (FHD) both in vitro and in vivo to malignant cells and microorganism by regulating leukocyte subset proportioning FHD as dietary material. Methods: In this approach of alternative study, selective anti-cancer effect by fermented decoction was tried to show first in vitro system both, cancer cell and virus strain. The fermented herbal decoction consisting of 80 sorts of herbs and fruits. The selective toxicity was set up and then for immunological factors in animal and human. The most important factor is to reduce side effect for a normal cell. Results: First, FHD was proved as safe by animal test. FHD regulated also the proportion of granulocyte and lymphocyte ratio both animal and human. In vitro culture showed selective toxicity by FHD against human melanoma and leukemia cell line but reduced toxicity was showed by normal cell line. As for the anti-virus activity, anti-virus effect was tested on the feeder layer of human fibroblast cell, after 9 days of culture. Second, FHD inhibits colon cancer growth in 3-methylholanthrene induced cancer in rat. Conclusion: The present results suggest that our fermented herbal decoction showed selective anti-cancer activities and anti-virus activities, together with the regulative effect on the immune system.

竹节香附素A对人结肠癌细胞HCT-116增殖、凋亡、迁移及侵袭活性的影响

目的研究竹节香附素A(Raddeanin A,RA)对人结肠癌细胞HCT-116增殖、凋亡、迁移及侵袭活性的影响,并初步探讨其作用机制。方法采用不同浓度的RA(0.125~50.0μmol·L^(-1))处理HCT-116细胞24,48 h,四甲基偶氮唑蓝(MTT)法检测细胞的增殖能力。RA(1.0,2.0,4.0μmol·L^(-1))干预后,采用Annexin V/PI双染法检测细胞凋亡率;JC-1染色法检测线粒体膜电位变化;DCFH-DA法检测细胞内活性氧簇(ROS)水平;采用Western Blot法检测细胞中Cleaved caspase-3蛋白表达。选择低于凋亡浓度的RA(0.25,0.5,1.0μmol·L^(-1))作用于HCT-116细胞,采用细胞划痕实验和Transwell穿膜实验观察不同浓度RA对HCT-116细胞迁移的影响;采用铺有Matrigel胶的Transwell实验检测RA对HCT-116细胞侵袭能力的影响;采用RT-PCR法和Western Blot法检测RA对HCT-116细胞中MMP-2、MMP-9 m RNA及蛋白表达的影响。结果 RA干预24,48 h后的IC50值分别为5.967μmol·L^(-1)和4.797μmol·L^(-1),且呈现浓度与时间依赖性。与空白对照组比较,RA1.0,2.0,4.0μmol·L^(-1)浓度组凋亡、坏死的HCT-116细胞明显增多(P<0.05,P<0.01);线粒体膜电位坍塌率分别为70.2%,74.4%和91.6%,差异均有统计学意义(P<0.01);细胞内ROS含量均显著增加(P<0.01),且呈现浓度依赖性;Cleaved caspase-3蛋白的表达水平随RA浓度的增加而显著提高(P<0.01)。RA干预后与空白对照组比较,0.5,1.0μmol·L^(-1)浓度组的细胞愈合率显著降低(P<0.01);RA 0.25,0.5,1.0μmol·L^(-1)浓度组均能显著抑制HCT-116细胞的迁徙能力(P<0.01),均能显著抑制HCT-116细胞体外侵袭能力(P<0.05,P<0.01);RA 0.5,1.0μmol·L^(-1)浓度组MMP-2、MMP-9 m RNA及蛋白相对表达水平均显著降低(P<0.05,P<0.01)。结论 RA既能够有效抑制人结肠癌HCT-116细胞增殖,又能诱导该细胞的凋亡,可能与诱导细胞内ROS产生,导致线粒体膜电位坍塌,激活caspase信号通路有关。低于凋亡浓度的RA(0.25,0.5,1.0μmol·L^(-1))能明显抑制HCT-116细胞的迁移与侵袭活性,可能与通过下调HCT-116细胞MMP-2、MMP-9m RNA及蛋白表达有关。

丁酸钠对人结肠癌细胞株HCT-116细胞凋亡及基质相互作用分子和Orai1蛋白活性的影响

目的研究丁酸钠诱导结肠癌细胞株HCT-116细胞凋亡机制。方法 hoechst 33342和AnnexinV+PI检测丁酸钠诱导结肠癌细胞HCT-116的凋亡作用;免疫荧光法检测丁酸钠对基质相互作用分子(STIMl)和钙离子通道Orail蛋白在细胞内定位的影响;免疫印迹法检测STIMl和Orail蛋白表达量的变化。结果丁酸钠可诱导结肠癌细胞HCT-116凋亡、STIMl移位并与Orail具有共定位现象。结论丁酸钠可通过调节STIM1和Orail在结肠癌细胞中的定位而促发细胞凋亡。

T-STAR基因对结肠癌细胞系HCT-116端粒酶活性的影响

目的:通过正、反义T-STAR(testis—signaltransduc—tionandactivatorofRNA)基因转染结肠癌HCT-116细胞,观察对细胞端粒酶活性的影响.方法:用脂质体Lipofectamine法将正、反义T-STAR基因转染入HCT-116细胞,用RT—PCR及Westernblot方法检测该细胞T—STAR基因mRNA和蛋白表达变化,并用PCR—ELISA法检测细胞端粒酶活性改变.结果:在T—STAR转染的结肠癌HCT-116细胞中,T—STARmRNA和蛋白表达显著增加(分别为296%,180%,P<0.01),端粒酶活性明显升高;而在反义T—STAR转染的细胞中,T—STARmRNA和蛋白表达显著下降(分别为59%,83.8%,P<0.01),端粒酶活性明显降低.转染空白载体和未转染细胞中T—STAR表达极端粒酶活性无显著性差异.结论:结肠癌HCT-116细胞T—STAR基因可能参与细胞端粒酶活性的正相调节.

阿西替尼对结肠癌HCT-116细胞增殖、凋亡及自噬的影响研究

目的研究阿西替尼(AXI)对结肠癌HCT-116细胞增殖、凋亡及自噬的影响。方法体外培养结肠癌HCT-116细胞,分为AXI 1组(15.0μmol/L)、AXI 2组(30.0μmol/L)、AXI 3组(60.0μmol/L)及无任何添加的正常对照组(NC组)。四甲基偶氮唑蓝法(MTT)检测各组结肠癌HCT-116细胞增殖情况;AnnexinV-FITC/PI法检测各组结肠癌HCT-116细胞凋亡情况;Western Blot检测结肠癌HCT-116细胞自噬相关蛋白LC3Ⅱ、beclin1,雷帕霉素靶蛋白(mTOR)信号通路中p-mTOR、p-P70S6K蛋白水平、增殖相关蛋白CyclinD1、c-Myc,以及凋亡相关cleaved-caspase3、B细胞淋巴瘤-2(Bcl-2)、Bax蛋白表达水平。结果与NC组比较,AXI 1组和AXI 2组结肠癌HCT-116细胞增殖抑制率、凋亡率、LC3Ⅱ、beclin1、Bax、cleaved-Caspase3蛋白表达水平依次增加(P<0.05),p-mTOR、p-P70S6K、Cyclin D1、c-Myc、Bcl-2蛋白表达水平依次减少(P<0.05)。AXI 2组和AXI 3组结肠癌HCT-116细胞增殖抑制率、凋亡率、LC3Ⅱ、beclin1、p-mTOR、p-P70S6K、CyclinD1、c-Myc、cleaved-caspase3、Bcl-2、Bax蛋白表达水平比较,差异无统计学意义(P>0.05)。结论AXI可通过抑制mTOR通路激活,诱导结肠癌HCT-116细胞自噬,抑制其增殖,促进其凋亡,初步揭示了AXI对结肠癌细胞的作用机制,为结肠癌的靶向治疗提供了新思路。

二氢青蒿素抑制结肠癌细胞株HCT-116并诱导凋亡的实验研究

目的:研究二氢青蒿素(Dihydroartemisinin,DHA)对人结肠癌HCT-116细胞的体外抑制并诱导凋亡,并探讨其作用机制。方法:以不同浓度的DHA作用于体外培养的HCT-116细胞,采用四甲基偶氮唑盐比色法(MTT法)检测细胞生长抑制率;应用流式细胞仪进行周期分析检测细胞凋亡情况;用Western Blotting法,检测不同浓度的DHA作用于肿瘤细胞时,凋亡相关蛋白Bcl-2,bax,cleavad-PARP表达情况。结果:在DHA作用后,HCT-116细胞生长受到明显抑制,IC50(半抑制浓度)值为14.18μmol/L。并呈一定的量效和时效依赖关系。流式细胞仪检测亚二倍体(sub-G0)比例增高;Western-Blotting检测药物处理细胞后Bcl-2表达水平下调,而Bax、cleavad-PARP表达水平明显上调。结论:DHA能抑制HCT-116细胞的生长增殖并诱导细胞发生凋亡。

Peiminine通过调控COX-2/PGE2/EGFR信号通路促进人结肠癌HCT-116细胞凋亡的分子机制

目的研究Peiminine调控COX-2/PGE2/EGFR信号通路促使人结肠癌HCT-116细胞凋亡的分子机制。方法基于ELISA法、Real-time qPCR和Western Blot法测定Peiminine处理人结肠癌HCT-116细胞后PGE2、COX-1、COX-2、ERK、P-ERK、P53、P-P53、P38和P-P38含量的变化。结果与对照组(Ctrl)相比,Peiminine处理后细胞内PGE2含量显著降低(P<0.01)。同时利用Real-time qPCR和Western Blot法检测发现Peiminine能够明显降低人结肠癌HCT-116细胞COX-2的含量,IL-6和NF-κB也显著下调而IL-10明显上调。后期的研究发现EGFR信号通路中关键蛋白(ERK、P-ERK、P53、P-P53、P38和P-P38)的表达量经Peiminine处理后均降低,具有统计学差异(P<0.01)。结论Peiminine可以抑制COX-2的表达和PGE2的生成,改善抗肿瘤免疫反应,抑制EGFR信号通路,从而促进肿瘤细胞凋亡,达到抗肿瘤的作用。

甲磺酸阿帕替尼对结肠癌HCT-116细胞增殖、凋亡及PI3K/Akt信号通路的影响

目的探讨甲磺酸阿帕替尼对结肠癌HCT-116细胞增殖、凋亡及磷脂酰肌醇3-激酶/蛋白激酶B(PI3K/Akt)信号通路的影响。方法体外培养结肠癌HCT-116细胞实验分为空白对照组、阿帕替尼组,分别给予终浓度为0、5、10、20μmol/L的甲磺酸阿帕替尼继续培养48 h,分别检测细胞增殖和细胞凋亡情况,同时检测HCT-116细胞中PI3K、p-PI3K、Akt、p-Akt、Bcl-2、Bax和Caspase-3蛋白表达水平。结果给予甲磺酸阿帕替尼处理后,HCT-116细胞增殖率降低,细胞凋亡率增加,且随着甲磺酸阿帕替尼剂量增加,细胞增殖率降低和细胞凋亡率增加越显著,差异均有统计学意义(P<0.05);给予甲磺酸阿帕替尼处理后,HCT-116细胞PI3K和Akt表达变化不显著,差异无统计学意义(P>0.05);p-PI3K、p-Akt和Bcl-2表达降低,Bax和Caspase-3表达增加,且随着甲磺酸阿帕替尼剂量增加,p-PI3K、p-Akt和Bcl-2降低越显著,Bax和Caspase-3表达增加越显著,差异均有统计学意义(P<0.05)。结论甲磺酸阿帕替尼能抑制HCT-116细胞增殖和促进凋亡,且具有浓度依赖性,其机制可能与甲磺酸阿帕替尼抑制了PI3K/Akt信号通路,启动了细胞凋亡程序有关。