Ursolic Acid Derivatives Induced Apoptosis and Reduces the NF-κB in Human Lung Adenocarcinoma Cells

Lung cancer is the major cause of death in the neoplastic diseases. In spite of the advances in the chemotherapy, the lung cancer treatments are still complex and costly, being necessary the seeking of new drugs. In this context, the ursolic acid (UA) becomes the target of studies that investigate its antitumor potential and, thus, structural modifications can enhance its biological activities. Eight UA semisynthetic derivative compounds (UAD1-8) were synthesized and evaluated their cytotoxic activity against human alveolar adenocarcinoma cells (A549). UAD1, UAD3, UAD5, UAD6 and UAD8 were able to reduce the viability of the A549 cells. Only UAD1 and UAD6 reduced the viability at 24 h, and only UAD3 didn’t reduce the NF-κB expression. The compound UAD1 showed the greater apoptosis induction. Moreover, the compound UAD1 showed better results than UA in all assays. The present study shows, for the first time, the action of these compounds in the apoptotic effect, in the expression of NF-κB and in the A549 cell line. The ursolic acid derivatives showed substantial results in the apoptosis, cytotoxicity and NF-κB inhibition of A549 cells, and further studies are necessary for the development of possible new therapeutic drugs.

Pyrrolidine Dithiocarbamate (PDTC) Attenuates Luteolin-Induced Apoptosis in Human Leukemia HL-60 Cells

Studies have indicated that flavonoid luteolin is a potential inhibitor of tumor cell proliferation and may function as an anticarcinogenic agent. Pyrrolidine dithiocarbamate (PDTC), a synthetic compound, may exhibit biphasic effects on apoptosis depending on the experimental context. Previously, we found that luteolin induced the activation of the proapoptotic proteins, such as Bad, Bid, and Bax, in HL-60 human leukemia cells. We also explored the modulatory effects and molecular mechanisms of PDTC on the cytotoxicity of luteolin in HL-60 cells;PDTC could interfere with luteolin’s ability to cleave poly(ADP-ribose)-polymerase (PARP) and DNA fragmentation of factor-45 (DFF-45). In the current study, we further investigated the effect of PDTC on the luteolin-induced death-receptor pathway and the cleavage of the Bcl-2 family members. We found that the combination of luteolin and PDTC increased the survival of the HL-60 cells such that PDTC inhibited both extrinsic and intrinsic pathways in luteolin-induced apoptosis.

Regulation of Histone Acetylation and Apoptosis by Trichostatin in HL-60 Cells

Summary: In order to examine the strong anticancer action and low toxicity of Trichostatin A (TSA), the effect of TSA was examined on the growth inhibition, acetylation of histone H_3 and apoptosis in HL-60 cells by employing MTT, immunocytochemical techniques, and Annexin-V-FITC/PI assay. Our results showed that TSA could inhibit proliferation of HL-60 cells in a time-and dose-dependent manner, and the IC_~50 at the 36th h was 100 ng/ml. The apoptosis-inducing effect of TSA on HL-60 cells was also time-and dose-dependent. But it didn't demonstrate apparent apoptosis induction in NPBMNCs within specific dose and time range. Both of the acetylation of histone H_3 in HL-60 cells and NPBMNCs increased significantly (P<0.05) after treated with 100 ng/ml TSA for 4 h. However, there was no significant differences between the two groups (P>0.05). It is concluded that TSA can inhibit growth and induce apoptosis of HL-60 cells in a time-and dose-dependent manner, and is able to selectively induce apoptosis in HL-60 cells but does not respond in NPBMNCs under the same conditions. The difference of TSA between HL-60 cells and NPBMNCs can't be explained by the regulation of histone acetylation.

Effect of Concurrent Use of rh-IL-3 and rh-GM-CSFon Apoptosis of HL-60 Cells Induced by Ara-C

The myeloid leukemic cell line HL-60 was studied by using DNA gel electrophoresis, flow cytomery, McAb C-myc, McAb Bc1-2 and CFU-L. From zero to 36 h,the apoptosis rates of 8 different phases and other indexes were observed. The results showed that with the prolonged time of drug incubation,apoptosis of HL-60 cells increased progressively. This effect can be enhanced obviously by rh-IL-3 and rh-GM-CSF. At the same time,the killed rate of leukemic cells by Ara-C induction was increased. C-myc expression was decreased and Bc1-2 expression did not display apparent change. Interestingly, the normal hemopoietic cells were not affected by these two kinds of cytokine. The theoretical basis was provided for concurrent use of rh-IL-3, rh-GM-CSF and cytotoxic drugs whose purpose is to elevate remission rate during the phase of induced remission of leukemia.

Effect of N’-Acetylindirubin on Proliferation, Apoptosis and Cell Cycle in Acute Myeloid Leukemia HL-60 Cells

Acute promyelocytic leukemia (APL) is a severe type of acute leukemia and the prognosis of patients was poor. Indirubin is the active constituent of the traditional Chinese medicine qingdai and an indoline anti-tumor drug. N’-Acetylindirubin is a novel indirubin derivative with better curative effect and less side effect. In this study, the effects of N’-Acetylindirubin on proliferation, apoptosis and cell cycle of acute myeloid leukemia cell line HL-60 was examined. The results demonstrated that N’-Acetylindirubin significantly induced apoptotic cell death in a dose and time-dependent manner and arrested cell cycle in G2/M in HL-60 cells. N’-Acetylindirubin also suppressed cyclin D1. This study suggests that N’-Acetylindirubin may serves as a potential chemopreventive agent for acute promyelocytic leukemia.

Proliferation-Inhibiting and Apoptosis-lnducing Effects of Ursolic Acid and Oleanolic Acid on Multi-Drug Resistance Cancer Cells in Vitro

Objective：To investigate the proliferation-inhibiting and apoptosis-inducing effects of ursolic acid（UA） and oleanolic acid（OA） on multi-drug resistance（MDR） cancer cells in vitro.Methods：UA and OA in different concentrations（0-100μmol/L） were added separately to cultures of different cancer cell lines, including the human colon cancer cell lines SW480 and SW620,human acute myelocytic leukemia cancer cell lines HL60 and HL60/ADR,human chronic myelogenous leukemia cell lines K562 and K562/ADR,and the human breast cancer cell lines MCF-7 and MCF-7/ADR.Effects of UA and OA on cell proliferation were detected by 3-（4,5-dimethyl-2-thiazole）-2-5-biphenly-tetrazole bromide（MTT） method and effects on cell apoptosis were tested by flow cytometry（FCM） and Western blot at 24,48,and 72 h after treatment.Results：Both UA and OA showed significant inhibition on parent and MDR cell lines in a time- and concentration-dependent manner;the drug-resistant multiple of them on K562 and K562/ADR as well as on HL60 and HL60/ADR was 1;the effects of UA were better than those of OA in inhibiting cell growth of solid colonic cancer and breast cancer.After SW480 cells were treated by UA at the concentrations of 0-40μmol/L for 48 h,FCM showed that annexin V （AV） positive cells and hypodiploid peak ratio increased along with the increase in the drug＇s concentrations; and Western blot found that expressions of Bcl-2,Bcl-xL and survivin decreased in a concentration-dependent manner.Conclusions：Both UA and OA have antitumor effects on cancer cells with MDR,and the optimal effect is shown by UA on colonic cancer cells.Also,UA shows cell apoptosis-inducing effect on SW480,possibly by way of down-regulating the expressions of apoptosis antagonistic proteins,Bcl-2,Bcl-xL,and survivin.

CLONING AND EXPRESSION OF A GENE ASS0CIATE WITH HL_(60)CELL APOPTOSIS INDUCED BY INHIBITIONOF POLYAMINE BIOSYNTHESIS

Objective: To clone the gene associated with apoptosis induced by an inhibitor of polyamine biosynthesis, a-difluoromethylornithime(DFMO). Methods: The differential sufbtraction sereening was used for gene cloning from cDNA library of HL60 cells treated by DFMO. Northern blot,morphological observation, FCM assays and ladder map of DNA electrophoresis were performed. Results: The transfectiong gene expression and activity of inducing apoptosis in the cell transfected from recombinant plasmid containing the cloned fragment df4 wasproved. Conclusion: It is suggest that df4 gene cloned in the study coul be a gene regulating apoptosis of HL60 cells.

INHIBITION OF NF-κB ACTIVITY ENHANCED CYTOSINE ARABINOSIDE INDUCED APOPTOSIS IN LEUKEMIC CELL LINE HL60-N

Objective: To explore the effects of dexamethasone (DXM) and vincristine (VCR) on cytosine arabinoside (Ara-C) induced apoptosis and activation of nuclear factor-k-gene binding (NF-kB) in leukemic cell line HL60-n. Methods: Apoptosis of HL60-n cells was analysed by TdT-mediated X-dUTP nick and end labeling (TUNEL) and DNA electrophoresis. NF-kB activity of HL60-n cells was detected by electrophoretic mobility shift assay (EMSA). Results: There was slight activation of NF-kB in HL60-n cells without drug induction. Ara-C at 1 mmol/L significantly enhanced the activation of NF-kB in HL60-n cells. The level of NF-kB activation induced by DXM at 1 mmol/L or VCR at 0.1 mmol/L had no significant difference compared with that of the control group. However, in HL60-n cells pre-treated with 1 mmol/L of DXM or 0.1 mmol/L of VCR, the activation of NF-kB induced by 1 mmol/L of Ara-C was significantly suppressed with inhibition rates of 31.0% and 47.0%, respectively. The apoptosis rates of HL60-n cells induced by 1.0 mmol/L, 10 mmol/L and 100 mmot/L Ara-C were 45.003.16%, 61.883.40% and 77.624.75%, respectively. The apoptotic rates of HL60-n cells induced by DXM at 1 mmol/L or VCR at 0.1 mmol/L were similar to that of the control group. However, either DXM at 1 mmol/L or VCR at 0.l mmol/L could enhance the apoptosis of HL60-n cells induced by Ara-C at 1 mmol/L with rates of 39.1% and 59.2%, respectively. Conclusion: Ara-C can induce apoptosis and activation of NF-kB in HL60-n cells. The mechanism of increased apoptosis of HL60-n cells by DXM or VCR may be related to suppression of NF-kB activation.

Generation of bcl-2 antisense RNA promotes apoptosis of human promyelocytic leukemia cell line HL-60

Objective: To analyze the effect of bcl-2 antisense RNA on the apoptosis of promyelocytic cell line HL-60. Methods: A plasmid pDOR-AB containing bcl-2 antisense cDNA was trans fected into HL-6O cells by lipofectin, and the effect of transfection was assured by DNA and RNA dot blottingI the change of bcl-2 expression and cell cycle was tested by flow cytometry; a morphologica1 change was observed by light microscope and electron microscope; and finally the sensitivity of trans fected cells to etoposide was compared with that of non-trans fected cells by gel electrophoresis. Results: pDOR-AB was successfully trans fected into HL-6o cells and its transcript was observed; Bcl-2 was down-regulated significantly ; apoptosis peak appeared before G1 phase in flow cy-tometry analysis: apoptotic cells could be seen by electron microscope, and during DNA gel electrophoresis the DNA ladder apppeared more frequently in the group trans fected with pDOR-AB than in transfected with pDOR and untransfected groups. Conclusion: Transient expression of bcl-2 antisense RNA can promote apoptosis of HL-60 cells and bco-2 plays a key role in the apoptosis of HL-60 cells.

Combined Antitumor Effect of Ursolic Acid And 5-Fluorouracil on Human Esophageal Carcinoma Cell Eca-109 In Vitro

Objective： To study the combined antitumor effect and possible mechanisms of ursolic acid with 5-fluorouracil （5-FU） on human esophageal carcinoma cell Eca-109 in vitro. Methods： Eca-109 cells were treated with ursolic acid （10-50 μmol/L） and/or 5-fluorouracil （48.0-768.8 μmol/L） for 48 h in vitro. And then cell proliferation was determined by MTT assay. Cell cycle and apoptosis rate were analyzed by flow cytometry （FCM）. The morphological changes of apoptosis were observed by fluorescent microscopy. At last the expression of P27kipl, bcl-2 and bax were detected by western blot. Results： Results： In comparison with single agent treatment, the combination of ursolic acid and 5-fluorouracil produced greater efficacy in growth inhibition, cell cycle arrest at G0/G1 phase, and apoptosis induction （P〈0.05）. Western blot analysis showed that the combination use of ursolic acid and 5-fluorouracil suppressed the expression of bcl-2 and increased the expressions of bax and P27kip1. Conclusion： Ursolic acid combined with 5-fluorouracil showed adjuvant antiproliferative effects on human esophageal carcinoma cell Eca-109 in vitro, which mainly due to the induction of cell cycle arrest as well as apoptosis.

Apoptosis Induced by Bcl-2 Antisense Peptide Acid in HL60 Cells

Objective To study the differences and similarities of the antisense drugs with different structures on the biological functions of HL60 cells. Methods Cytotoxic effects were measured by cell viability assay. The expression levels of protein were assayed by immunofluorescence using fluoresce isothiocyanate label. The morphological changes in apoptotic cells were observed. Flow cytometric analysis of DNA fragmentation was also performed. Results Antisense peptide nucleic acid (PNA) targeting the coding region of the Bcl-2 mRNA could effectively inhibit the growth of HL60 cells, down-regulate the synthesis of Bcl-2 protein and induce apoptosis. After HL60 cells were treated with 10 μmol/L Bcl-2 antisense PNA or antisense oligonucleotide for 72 h respectively, apoptotic rates of HL60 cells were 17.80±1.53 and 13.17±1.12, respectively( P <0.05). Conclusion Antisense PNA targeting the coding region of Bcl-2 mRNA may have stronger antisense effects than the antisense oligonucleotides and could induce apoptosis of HL60 cells.

Potentiation of arsenic trioxide induced apoptosis by retinoic acid in retinoic acid sensitive and resistant HL-60 myeloid leukemia cells

Objective To study the effect of arsenic trioxide (As 2O 3) on non APL acute myeloid leukemia (AML) cells and the interreactive effect between retinoic acid (RA) and As 2O 3 Methods RA sensitive (S) and RA resistant (R) HL 60 non APL AML cells were used as an in vitro model Cell number and trypan blue were used to observe cell growth and survival Apoptosis was determined by morphological changes, using a DNA laddering assay, terminal deoxynucleotidyl transferase (TdT) fragment end labeling assay and a flow cytometry assay Results As 2O 3 induced apoptosis in both HL 60S and HL 60R cells, As 2O 3 induced apoptosis was both time and concentration dependent in a therapeutically achievable As 2O 3 range (0 25-4.0?μmol/L) Both all trans retinoic acid (ATRA) and 9 cis retinoic acid (9cRA) potentiated As 2O 3 induced apoptosis, as measured by quantitative TdT fragment end labeling and flow cytometry assays in both HL 60S and HL 60R cells ( P <0 05, for all RA+As 2O 3 combinations vs As 2O 3 alone in both sublines) Conclusions As 2O 3 may inhibit the growth of non APL AML cells by promoting programmed cell death RA can potentiate As 2O 3 induced apoptosis even in RA resistant HL 60 cells in which the classical ATRA response pathway is repressed owing to a homozygous inactivating mutation in the retinoic acid receptor α As 2O 3 can have clinical activity in non APL cases of AML and the enhanced activity might result from the combined As 2O 3 RA therapy

Securinine induced apoptosis in human leukemia HL-60cells

目的：研究一叶秋碱能否诱导ＨＬ６０细胞凋亡．方法：用ＭＴＴ法检测一叶秋碱对细胞增殖影响；应用流式细胞仪检测凋亡细胞数；采用琼脂糖凝胶电泳法观测ＤＮＡ碎片；透射电镜观察凋亡的形态改变．结果：一叶秋碱５－８０ｍｇ·Ｌ－１能诱导ＨＬ６０细胞凋亡．电镜观察到典型的凋亡形态学改变，电泳呈现出阶梯状条带，流式细胞仪检测到凋亡率随剂量的增高而升高．ＭＴＴ法示一叶秋碱抑制ＨＬ６０细胞增殖，并且呈时间、剂量依赖性，药物作用１２ｈ的ＩＣ５０（９５％可信区间）分别为２７（１５－４７）ｍｇ·Ｌ－１．

Inhibition of NF-κB by mutant IκBα enhances TNF-α-induced apoptosis in HL-60 cells by controlling bcl-x_L expression

Backgound The aim of this study was to explore whether the inhibition of nuclear factor-κB (NF-κB) activation by mutant IκBα (S32,36→A) can enhance TNF-α-induced apoptosis of leukemia cells and to investigate the possible mechanism.Methods The mutant IκBα gene was transfected into HL-60 cells by liposome-mediated techniques. G418 resistant clones stably expressing mutant IκBα were obtained by the limiting dilution method. TNF-α-induced NF-κB activation was measured by electrophoretic mobility shift assay (EMSA). The expression of bcl-x L was detected by RT-PCR and Western blot after 4 hours exposure of parental HL-60 and transfected HL-60 cells to a variety of concentrations of TNF-α. The percentage of apoptotic leukemia cells was evaluated by flow cytometry (FCM). Results Mutant IκBα protein was confirmed to exist by Western blot. The results of EMSA showed that NF-κB activation by TNF-α in HL-60 cells was induced in a dose-dependent manner, but was almost completely inhibited by mutant IκBα repressor in transfected cells. The levels of bcl-x L mRNA and protein in HL-60 cells increased after exposure to TNF-α, but changed very little in transfected HL-60 cells. The inhibition of NF-κB activation by mutant IκBα enhanced TNF-α-induced apoptosis. The cytotoxic effects of TNF-α were amplified in a time- and dose-dependent manner.Conclusions NF-κB activation plays an important role in the resistance to TNF-α-induced apoptosis. The inhibition of NF-κB by mutant IκBα could provide a new approach that may enhance the anti-leukemia effects of TNF-α or even of other cytotoxic agents.

Effects of arotinoid acid on induction of apoptosis and differentiation and telomerase activity and cell cycle in the HL 60 cell line

Objective To investigate the effects of arotinoid acid (Ro13 7410) on the morphological and functional alterations of leukemia HL 60 cell line and compared with those of RA Methods Differentiation of HL 60 cells was assessed by morphology and by NBT reduction Trypan blue exclusion was used to determine viability Apoptosis was assessed by changes in cell morphology and by measurement of fragmented DNA using the PCD assay kit Telomerase PCR ELISA kit tested telomerase activity The cell cycle was analyzed by flow cytometry Results Incubation of the HL 60 cells with 10 -6 10 -8 ?mol/L Ro13 7410 resulted in suppression of cell growth Apoptotic cells were detected following exposure to 10 -6 ?mol/LRo13 7410 for 3 hours by measurement of the “in situ” enzymatic labeling of DNA breaks with biotinylated dUTP Ultrastructural examination of Ro13 7410 treated samples showed cells with chromatin compaction and cytoplasm condensation and the presence of “apoptotic bodies” Cells induced into apoptosis were accompanied by Department of Hematology, the First Affiliated Hospital, Chongqing University of Medical Sciences, Chongqing 400016, China (Liu XS, Lou LS, Zeng SR and Tang ZH) Department of Clinical Biochemistry, Chongqing University of Medical Sciences, Chongqing 400046, China (Jiang JK, Zhang Y, Xu XG, Liu BZ, He YJ and Kang GF) increase of intracellular free Ca 2+ Percentage of HL 60 cells reduced NBT following incubation with Ro13 7410 was lower than with all trans retinoic acid (RA) (27% vas 85%) Telomerase PCR ELISA assay showed that HL 60 cells cultured in the absence of inducing agents had significant telomerase activity Telomerase activity declined gradually after 10 -6 ?mol/L Ro13 7410 treatment, and changes becoming evident at 1 day The inhibition of telomerase activity at day 5 of treatment with Ro13 7410 was less effective than with RA DNA flow cytofluorimetric analysis revealed that Ro13 7410 caused partial cell arrest in the G 2/M phase after a 2 day treatment and the percentage of cells arrested in the G 2/M phase increased after 4 days treatment With RA treated cells, a reduction in the percentage of cells in the G 2/M phase was observed after 2 day of treatment Conclusion Our study shows that Ro13 7410 suppresses HL 60 cells growth mainly via the induction of apoptosis and is less effective than RA in induction differentiation Ro13 7410 dramatically inhibits telomerase activity during the course of induction and results in G 2/M arrest within 2 days These findings suggest that Ro13 7410 is worthy of further study for its effects on leukemic cells

Induction of apoptosis in HL-60 cells by harringtonine

Recently, many reports showed that most of cytotoxic anticancer drugs in current usesuch as DNA topoisomerase Ⅰinhibitor camptothecin (CAM), or DNA topoisomerase Ⅱinhibitor teniposide (TEN) could induee apoptosis in susceptible cells. Apoptosis (Apo),which is different from necrosis (Nec), is a specific mode of cell death recognized by thecharacteristic pattern of condensation of chromatin, integrity of plasma membrane and

过表达miR-186对白血病HL-60细胞增殖和凋亡作用机制的研究

目的探究过表达miR-186对白血病细胞增殖、凋亡及磷脂酰肌醇3激酶(PI3K)/蛋白激酶B(AKT)信号通路的调控作用。方法选取人白血病HL-60细胞,通过实时荧光定量PCR(RT-qPCR)、细胞计数试剂-8(CCK-8)、Hoechst33258染色、酶联免疫吸附试验(ELISA)及蛋白质印迹法(WB)法分析细胞形态、miR-186相对表达量、增殖能力、凋亡情况、相关因子表达水平。结果转染24 h后,与mimic NC组相比,miR-186组细胞生长受到抑制,miR-186相对表达量、凋亡细胞数、超氧化物歧化酶(SOD)、caspase-3蛋白表达水平显著升高(P<0.05),而细胞增殖活力、丙二醛(MDA)、p-PI3K和p-AKT、Bcl-2蛋白表达水平均显著降低(P<0.05)。PI3K/AKT信号通路抑制剂的加入使各项指标差异更加显著(P<0.05)。结论过表达miR-186能够通过抑制PI3K/AKT信号通路抑制人白血病HL-60细胞的增殖并改善氧化应激水平,促进细胞凋亡。

Effect of adenovirus-mediated p27 gene expression on the proliferation and apoptosis of HL-60 and Raji cell lines

Background p27 is an essential mediator of cell cycle control,which plays a key negative role in the proliferation and tumorigenesis of certain cell types. Here, we designed this study to explore the possible effects of p27 on the proliferation and apoptosis of HL-60 and Raji cell lines.Methods HL-60 and Raji cells were transfected with p27 via an adenovirus-mediated approach. The efficiency of Adp27 infection and the expression of p27 mRNA and protein were evaluated by X-gal staining, RT-PCR, and flow cytometry. The proliferation and apoptosis of HL-60 and Raji cells were estimated by means of trypan blue staining, MTT assay, Annexin V/PI, and DNA ladder electrophoresis. Results The infection efficiencies in HL-60 and Raji cells were 40.3% and 32.0%, respectively. RT-PCR and flow cytometry showed that there was significant expression of p27 mRNA and protein in HL-60 and Raji cells infected with Adp27; on the other hand, uninfected HL-60 cells showed faint traces of p27 mRNA and protein and Raji cells showed nearly no signs of p27 mRNA and protein. As demonstrated by a cell growth curve and by an MTT assay, strong time-dependent proliferation inhibition was apparent in HL-60 and Raji cells infected by Adp27. After 72 hours of infection, the Annexin V+/PI- apoptotic cell rates in HL-60 and Raji cell lines were 46.9% and 35.7%, respectively, significantly higher than in the control groups (4.7% and 5.6%, respectively). Typical DNA ladder bands were detectable in HL-60 and Raji cells after 48 hours of Adp27 infection. Conclusions Adenoviral vector-mediated p27 gene transfection of HL-60 and Raji cells leads to the inhibition of cellular proliferation and the promotion of cell apoptosis. This technique may provide an approach to gene therapy for leukemia or lymphoma.

Nucleostemin下调联合雷帕霉素对HL-60细胞自噬与凋亡影响的初步研究

目的:研究Nucleostemin(NS)下调联合雷帕霉素对HL-60细胞自噬和凋亡的影响并探讨其在HL-60细胞中的作用。方法:通过NS-RNAi-GV248重组慢病毒载体转染HL-60细胞后检测NS蛋白的表达。采用流式细胞术检测沉默NS和/或雷帕霉素处理24、48 h后HL-60细胞的凋亡变化;采用Western blot技术检测各组细胞中NS、LC3、p62、BCL-2、Bax蛋白的表达。结果:重组慢病毒载体成功下调HL-60细胞NS表达。经雷帕霉素处理后,细胞凋亡率均明显增加(P<0.05),且48 h凋亡更明显。与NS敲低组、雷帕霉素组相比,NS下调联合雷帕霉素组处理48 h后,其凋亡明显增加(P<0.05),LC3-II/LC3-I比值显著增加(P<0.05),p62蛋白表达下降更显著(P<0.05),并且BCL-2/Bax比值减低更明显(P<0.05)。结论:NS下调联合雷帕霉素可增强HL-60细胞的凋亡和自噬,并且其诱导HL-60细胞的凋亡可能与BCL-2、Bax蛋白的表达有关。

白花蛇舌草对人白血病细胞株HL-60增殖、凋亡及PI3K/AKT和Wnt/β-catenin信号通路的影响

目的 探究白花蛇舌草对人白血病细胞株HL-60增殖、凋亡的影响及其作用机制。方法 将HL-60细胞随机分为0μmol/L组、3μmol/L组、6μmol/L组和12μmol/L组,分别采用0、3、6、12μmol/L浓度白花蛇舌草处理。流式细胞仪检测细胞凋亡和细胞周期分布;JC-1法检测线粒体膜电位;Western blot检测Ki-67、Caspase-3、c-Myc、Cyclin D1、CDK4、AKT、p-AKT、Wnt1、β-catenin蛋白表达水平。结果 与0μmol/L组比较,6、12μmol/L组细胞凋亡率和G1期比例明显升高,S期比例和线粒体膜电位明显降低,cleaved Caspase-3/Caspase-3比值升高,Ki-67、c-Myc、Cyclin D1、CDK4、Wnt1、β-catenin蛋白表达水平和p-AKT/AKT比值降低,差异均有统计学意义(P<0.05)。结论 白花蛇舌草通过PI3K/AKT、Wnt/β-catenin信号通路抑制HL-60细胞增殖,诱导细胞凋亡。