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.

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.

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.

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.

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.

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

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

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.

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.

川楝素对人结肠癌细胞LoVo生物行为学的影响

目的探讨川楝素对人结肠癌细胞LoVo生物行为学的影响。方法采用MTT法、黏附实验、Transwell小室侵袭实验,观察川楝素对人结肠癌细胞LoVo增殖、黏附和侵袭能力的影响。结果川楝素能有效抑制人结肠癌细胞LoVo增殖(P<0.01)。川楝素作用人结肠癌细胞LoVo 24 h后,细胞的黏附能力明显降低(P<0.01),侵袭的细胞数与对照组比较明显减少(P<0.01)。结论川楝素有抑制人结肠癌细胞LoVo的增殖、黏附及侵袭的能力。

大黄素通过ROS介导大肠癌细胞株LOVO凋亡的实验研究

目的观察大黄素对人大肠癌细胞株LOVO凋亡的影响,并探讨活性氧(ROS)是否介导了大黄素诱导细胞凋亡的过程。方法体外分组培养人大肠癌细胞株LOVO,设空白对照组和大黄素3个不同浓度干预组(40,80,120μmol.L-)1,大黄素干预时间分别为12,24,48 h。以四甲基偶氮唑盐(MTT)法检测细胞增殖率、AnnexinⅤ-FITC和PI双染流式细胞术检测凋亡,激光扫描共聚焦显微镜检测细胞内ROS水平,Western印迹法检测caspase-3表达。结果与空白对照组比较,大黄素干预组呈浓度依赖性诱导大肠癌细胞株LOVO凋亡,细胞内ROS水平明显增加,caspase-3的表达明显上调,差异均有统计学意义(P<0.05)。结论大黄素通过ROS介导线粒体凋亡信号通路诱导大肠癌细胞凋亡,可能是大肠癌细胞凋亡诱导途径之一。

反义DLC-1基因对结直肠癌LoVo细胞增殖和细胞周期的影响

目的应用核糖核酸干扰(RNAi)技术,通过对大肠癌细胞株LoVo中DLC-1基因mRNA表达的抑制,初步探讨DLC-1基因对大肠癌细胞株的生物学行为影响。方法构建DCL-1的RNAi重组体pGCsiDLC,转染大肠癌LoVo细胞株。采用RT-PCR观察转染前后细胞株中DLC-1 mRNA以及Bax、Bcl-2基因表达的改变,MTT比色法检测转染前后细胞增殖,流式细胞仪检测细胞周期。结果成功构建发卡siRNA真核表达载体pGCsiDLC;pGCsiDLC转染LoVo细胞后,电泳显示DLC-1 mRNA表达水平明显下降;LoVo细胞生长曲线增长幅度亦随时间的增加而逐渐增高,在48h最为明显,RNAi组细胞比脂质体组及空白对照组细胞增殖明显增高(P<0.05);干扰后的LoVo细胞株G0/G1期发生阻滞,而G2/M期细胞数量分布减少。而Bax和bcl-2基因表达在干扰前后未见明显改变。结论成功构建载体介导的DLC-1靶向RNAi重组体可有效抑制LoVo细胞DLC-1 mRNA表达;DLC-1基因可抑制结直肠癌细胞增殖并且对细胞周期重新分布,其可能与结直肠癌的发生发展有一定关系,可能是一个新的抑癌基因。

藤黄酸对人结肠癌LOVO、SW480细胞端粒酶的抑制作用

目的探讨藤黄酸(GA)对人结肠癌LOVO、SW480细胞端粒酶的抑制作用及可能机制。方法用不同浓度的藤黄酸作用体外生长的人结肠癌LOVO、SW480细胞,采用CCK-8法检测两株细胞增殖抑制率,蛋白质印迹法(Western blot)检测两株细胞h TERT蛋白表达,实时荧光定量QRT-PCR法检测h TERT mRNA表达。结果藤黄酸对人结肠癌LOVO、SW480细胞具有显著抑制增殖作用,并呈现明显的浓度及时间依赖性(P<0.05或P<0.01);Western blot结果显示,藤黄酸能降低LOVO、SW480细胞h TERT蛋白的表达,且呈浓度依赖性(P<0.05或P<0.01);QRT-PCR测定显示,藤黄酸能降低LOVO、SW480细胞h TERTmRNA的表达,呈浓度依赖性(P<0.05或P<0.01)。结论藤黄酸能够显著抑制人结肠癌LOVO、SW480细胞的增殖,其机制可能是通过下调h TERT mRNA的表达而有效地抑制癌细胞端粒酶活性。

结肠癌耐药细胞株LoVo/5-Fu中microRNA表达的初步研究

目的建立结肠癌细胞耐药模型LoVo/5-FU并初步筛选可能的耐药相关的microRNA。方法采用5-FU浓度递增法建立人结肠癌细胞耐药模型LoVo/5-FU,观察其生长规律并绘制细胞生长曲线;用MTT法鉴定耐药细胞株耐药性并计算耐药指数(RI);用microRNA芯片技术检测耐药细胞株LoVo/5-FU与其亲本细胞株LoVo中mi-croRNA的表达谱,筛选差异表达的microRNA;用实时荧光定量PCR方法对筛选出的部分差异microRNA在耐药细胞及其亲本细胞中的表达情况进行验证。结果 LoVo/5-FU细胞与LoVo细胞相比,生长缓慢,细胞体积增大,耐药株LoVo/5-FU细胞相对于其亲本LoVo细胞的耐药倍数为8.08。microRNA芯片的结果显示,耐药株LoVo/5-FU细胞与亲本LoVo细胞比较,有10个microRNA表达上调,13个microRNA表达下调;实时荧光定量pcr的结果进一步证实mir-210、mir196a、mir-1281在LoVo/5-FU中显著上调,而let-7f、mir-1228显著下调,其中mir-210在LoVo/5-FU与LoVo中的表达有明显差异。结论 LoVo/5-FU细胞株耐药性稳定,筛选获得的差异miRNA可能通过调控其靶基因而参与人结肠癌细胞对5-Fu的耐药,为进一步研究microRNA在结肠癌耐药机制中的作用奠定基础。

LoVo细胞系中结肠癌干细胞样细胞的分离、培养及鉴定

目的:从结肠癌LoVo细胞系中分离、鉴定具有CD44+/EPCAMhigh特异表型的结肠癌干细胞样细胞,观察其生物学行为,证实该细胞系中结肠癌干细胞样细胞的存在。方法:从普通血清培养的LoVo细胞系中以流式细胞仪分选具有CD44+/EPCAMhigh表型的细胞,接种于添加生长因子的无血清培养基中,观察其增殖过程,继而诱导分化。MTT法、流式细胞术检测CD44+/EPCAMhigh、EPCAMlow和未分选LoVo细胞的增殖能力及细胞周期分布。3种细胞接种裸鼠,比较不同细胞的成瘤率;免疫荧光技术检测小鼠次代CD44+/EPCAMhigh细胞中CD44/EPCAM的表达。结果:LoVo细胞中有17.4%的CD44+/EPCAMhigh细胞,并能在添加生长因子的无血清培养基中呈细胞球样生长,且可连续传代;在血清的诱导下,呈贴壁分化生长,其形态与未分选LoVo细胞无差别。CD44+/EPCAMhigh细胞增殖能力高于EPCAMlow细胞及未分选LoVo细胞,且细胞周期多集中在G0/G1期。以500个CD44+/EPCAMhigh细胞接种裸鼠成瘤率为90%(9/10),而1×104个EPCAMlow细胞成瘤率为0(0/10)。小鼠移植瘤中次代CD44+/EPCAMhigh细胞仍能少量表达CD44和EPCAM。结论:LoVo细胞中存在CD44+/EPCAMhigh结肠癌干细胞样细胞,CD44+/EPCAMhigh可用于结肠癌肿瘤干细胞的深入研究。

菝葜皂苷元对结肠癌细胞Lovo黏附和侵袭能力的影响

目的:本研究旨在探讨菝葜皂苷元体外对人结肠癌细胞Lovo增殖、黏附、侵袭的影响。方法:采用MTT法、黏附实验、Transwell小室侵袭实验,观察菝葜皂苷元对人结肠癌细胞Lovo增殖、黏附和侵袭能力的影响。结果:①菝葜皂苷元有抑制人结肠癌细胞Lovo增殖的作用,与对照组比较,随着药物浓度的增大,其对细胞的抑制率也明显增大(P<0.01)。②菝葜皂苷元作用人结肠癌细胞Lovo后,细胞的黏附能力明显降低(P<0.01)。③菝葜皂苷元作用人结肠癌细胞Lovo 24h后,侵袭的细胞数较对照组明显减少(P<0.01)。结论:菝葜皂苷元对人结肠癌细胞Lovo的增殖具有抑制作用;菝葜皂苷元能抑制人结肠癌细胞Lovo的黏附能力和侵袭能力。

血桐叶水提物对人结肠癌LoVo细胞的增殖抑制作用

水煮浸提血桐叶,减压浓缩后冻干制成粗体样品;以MTT、生长曲线法、集落形成实验考察血桐叶提取物对人结肠癌LoVo细胞的增殖抑制作用,并且以倒置显微镜观察其对细胞形态影响.实验结果表明,血桐叶水提物对LoVo细胞的增殖有显著抑制作用,呈明显剂量依赖关系,并且对细胞的形态有改变作用.

Sphk1对人结肠癌细胞株Lovo增殖与侵袭的影响及其作用机制

目的:研究Sphk1对结肠癌细胞增殖、凋亡及侵袭的影响并探讨其机制.方法:将人结肠癌Lovo细胞株分成Sphk1激活组,Sphk1抑制组,空白对照组.以佛波醇-12-豆蔻酸酯-13-乙酸酯(phorbol12-myristate13-acetate,PMA)为Sphk1激活剂(终浓度为100nmol/L),N,N-二甲基鞘胺醇(erythro-sphingo-sineN,N-Dimethyl,DMS)为Sphk1抑制剂(终浓度为50μmol/L)处理Lovo细胞24h后,用MTT方法测定细胞的增殖活性,用流式细胞术检测细胞凋亡,用Transwell侵袭实验检测细胞侵袭能力,用Westernblot测定细胞Sphk1、ERK1/2、p-ERK1/2、NF-κBp65蛋白水平的变化.结果:PMA可以明显诱导Sphk1蛋白的表达,促进Lovo细胞生长,抑制细胞的凋亡,并促进细胞的侵袭;相反,DMS明显抑制Sphk1的表达,抑制细胞生长,促进细胞的凋亡,并抑制细胞的侵袭.Sphk1激活组、对照组、抑制组的细胞凋亡率分别是9.15%,16.25%,32.58%.与对照组相比,Sphk1激活组、抑制组的细胞相对侵袭率分别是190.57%,9.65%,差异有统计学意义(均P<0.01).PMA诱导Sphk1表达,同时伴有ERK1/2、p-ERK1/2和NF-κBp65蛋白表达的上调,DMS抑制Sphk1表达,可抑制ERK1/2、p-ERK1/2、NF-κBp65蛋白的表达.结论:Sphk1可促进Lovo细胞的生长增殖与侵袭并抑制细胞的凋亡,其机制可能与ERK1/2和NF-κB信号通路的激活有关.

人结肠腺癌Lovo细胞系蛋白质双向凝胶电泳技术的建立及其优化

目的优化人结肠癌Lovo细胞系的蛋白质样品制备方法,建立人结肠癌Lovo细胞系的双向凝胶电泳(2-DE)图谱。方法分别用磷酸盐缓冲液和等渗蔗糖溶液冲洗细胞,胰酶酶解后裂解和皿上直接裂解的方法提取所培养Lovo细胞的总蛋白质,利用固相pH梯度双向凝胶电泳技术进行分离,凝胶经银染显色后,用Melanie4软件分析2-DE图谱。结果以等渗蔗糖缓冲液冲洗细胞并经皿上直接裂解的方法所提取Lovo细胞总蛋白质进行双向电泳,可获得分辨率高、重复性好的人结肠癌Lovo细胞系2-DE图谱。结论以等渗蔗糖溶液冲洗细胞结合皿上直接裂解是一种较好的细胞蛋白质双向电泳样品制备方法,初步建立了分辨率较高且重复性好的人结肠癌Lovo细胞系蛋白质双向凝胶电泳图谱。

科罗索酸调控STAT3信号通路诱导结肠癌LoVo细胞凋亡

目的探讨科罗索酸对结肠癌Lo Vo细胞增殖凋亡的影响及其机制。方法将结肠癌Lo Vo细胞随机分成阴性对照组和不同浓度科罗索酸组。阴性对照组正常培养,科罗索酸组分别以5,10,20,40μmol·L-1科罗索酸作用24 h。噻唑蓝(MTT)法检测细胞增殖情况,流式细胞仪测定细胞凋亡情况,Western blot检测STAT3的表达及磷酸化STAT3(pSTAT3)水平。结果经5,10,20,40μmol·L-1科罗索酸作用Lo Vo细胞24 h后,细胞活性与阴性对照组相比,分别为(98.02±14.05)%,(78.25±8.71)%(P<0.05)、(36.63±13.36)%(P<0.01)和(18.41±10.38)%(P<0.01);阴性对照组凋亡细胞比例为(7.37±1.34)%;5,10,20,40μmol·L-1科罗索酸组凋亡细胞比例依次为(7.45±1.55)%,(12.72±3.46)%(P<0.05),(22.22±5.73)%(P<0.01)和(58.52±7.27)%(P<0.01)。Western blot显示科罗索酸处理后Lo Vo细胞p-STAT3水平明显降低。结论科罗索酸呈浓度依赖性地抑制结肠癌Lo Vo细胞增殖,促进细胞凋亡,其机制可能与阻断STAT3通路有关。