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1.
Eukaryotic initiation factor subunit c(eIF3c) has been identified as an oncogene that is over-expressed in tumor cells and,therefore,is a potential therapeutic target for gene-based cancer treatment.This study was focused on investigating the effect of small interfering RNA(siRNA)-mediated eIF3c gene knockdown on colon cancer cell survival.The eIF3c gene was observed to be highly expressed in colon cancer cell models.The expression levels of the gene in eIF3c siRNA infected and control siRNA infected cells were compared via real-time polymerase chain reaction(PCR) and western blotting analysis.Cell proliferation levels were analyzed employing 3-(4,5-dimethylthiazol 2-yl)-2,5-diphenyltetrazolium bromide(MTT) and colony formation assays.Furthermore,the effects of eIF3c gene knockdown on the cell cycle and apoptosis were analyzed using flow cytometry.The results showed that suppression of eIF3c expression significantly(P<0.001) reduced cell proliferation and colony formation of RKO colon cancer cells.The cell cycle was arrested by decreasing the number of cells entering S phase.Further,apoptosis was induced as a result of eIF3c knockdown.Collectively,eIF3c deletion effectively reduced the survival of colon cancer cells and could be used as a therapeutic tool for colon cancer therapy.  相似文献   

2.
This study aimed to assess the inhibitory activities of methanol extracts from the microalgae Ankistrodesmus convolutus, Synechococcus elongatus, and Spirulina platensis against Epstein-Barr virus (EBV) in three Burkitt's lymphoma (BL) cell lines, namely Akata, B95-8, and P3HR-1. The antiviral activity was assessed by quantifying the cell-free EBV DNA using real-time polymerase chain reaction (PCR) technique. The methanol extracts from Ankistrodesmus convolutus and Synechococcus elongatus displayed low cytotoxicity and potent effect in reducing cell-free EBV DNA (EC(50)<0.01 μg/ml) with a high therapeutic index (>28000). After fractionation by column chromatography, the fraction from Synechococcus elongatus (SEF1) reduced the cell-free EBV DNA most effectively (EC(50)=2.9 μg/ml, therapeutic index>69). Upon further fractionation by high performance liquid chromatography (HPLC), the sub-fraction SEF1'a was most active in reducing the cell-free EBV DNA (EC(50)=1.38 μg/ml, therapeutic index>14.5). This study suggests that microalgae could be a potential source of antiviral compounds that can be used against EBV.  相似文献   

3.
Hepatocellular carcinoma (HCC) is one of the most prevalent malignant tumors worldwide. Liver transplantation (LT) is known as a curative and therapeutic modality. However, the survival rates of recipients after LT are still not good enough because of tumor recurrence. To improve the survival rates of recipients after LT, identifying predictive factors for prognosis after LT and establishing a model assessing prognosis are very important to HCC patients. There has recently been a lot of clinical and basic research on recurrence and prognosis after LT. Progress has been made, especially in selection criteria for LT recipients and risk factors for predicting prognosis after LT. Hangzhou criteria, in line with China’s high current incidence rate of primary liver, are first proposed by Chinese scholars of LT, and are accepted world-wide, and make an important contribution to the development of LT.  相似文献   

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5.
心理弹性研究领域主要关注“效果性因素”,而“方向性因素”也具有无以取代的地位,尤其是主体生存图式的作用应该得到心理弹性研究的重视.为了探索主体的生存图式与心理弹性的关系,本研究编制了“一般生存图式量表”,并采用“Connor- Davidson韧性量表”中文版(CD- RISC -C)对大学二年级本科生施测.结果发现,大学生一般生存图式与心理弹性在总体水平以及各个维度上的均值都有着一致的变化趋势,两者存在显著的正相关;其中“生存实质”、“积极进取”和“主导价值”3个因素对心理弹性的回归效应显著.由此推论,通过优化主体的生存图式改善其心理弹性是一条可行的途径.  相似文献   

6.
This study probed the protective effect of recombinant Lactobacillus plantarum against hydrogen peroxide(H_2O_2)-induced oxidative stress in human umbilical vein endothelial cells(HUVECs). We constructed a new functional L. plantarum(NC8-p SIP409-alr-angiotensin-converting enzyme inhibitory peptide(ACEIP)) with a double-gene-labeled non-resistant screen as an expression vector. A 3-(4, 5-dimethyl-2-thiazolyl)-2, 5-diphenyl-2 H-tetrazolium bromide(MTT) colorimetric assay was carried out to determine the cell viability of HUVEC cells following pretreatment with NC8-p SIP409-alr-ACEIP. Flow cytometry(FCM) was used to determine the apoptosis rate of HUVEC cells. Cysteinyl aspartate specific proteinase(caspase)-3/8/9 activity was also assayed and western blotting was used to determine protein expression of B-cell lymphoma 2(Bcl-2), Bcl-2-associated X protein(Bax), inducible nitric oxide synthase(i NOS), nicotinamide adenine dinucleotide phosphate oxidase 2(gp91 phox), angiotensin II(Ang II), and angiotensin-converting enzyme 2(ACE2), as well as corresponding indicators of oxidative stress, such as reactive oxygen species(ROS), mitochondrial membrane potential(MMP), malondialdehyde(MDA),and superoxide dismutase(SOD). NC8-p SIP409-alr-ACEIP attenuated H_2O_2-induced cell death, as determined by the MTT assay. NC8-p SIP409-alr-ACEIP reduced apoptosis of HUVEC cells by FCM. In addition, compared to the positive control, the oxidative stress index of the H_2O_2-induced HUVEC(Hy-HUVEC), which was pretreated by NC8-p SIP409-alr-ACEIP, i NOS,gp91 phox, MDA, and ROS, was decreased obviously; SOD expression level was increased; caspase-3 or-9 was decreased, but caspase-8 did not change; Bcl-2/Bax ratio was increased; permeability changes of mitochondria were inhibited; and loss of transmembrane potential was prevented. Expression of the hypertension-related protein(Ang II protein) in HUVEC cells protected by NC8-p SIP409-alr-ACEIP decreased and expression of ACE2 protein increased. These plantarum results suggested that NC8-p SIP409-alr-ACEIP protects against H_2O_2-induced injury in HUVEC cells. The mechanism for this effect is related to enhancement of antioxidant capacity and apoptosis.  相似文献   

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8.
目的 :研究新城疫病毒在体外抗胃癌细胞活性及其与细胞凋亡的关系。方法 :应用倒置显微镜观察细胞形态、MTT法测NDV在体外对BGC - 82 3的抑制和杀伤作用 ,同时用流式细胞术检测胃癌细胞凋亡情况及细胞分裂周期各时象的变化。结果 :NDV在体外可使BGC - 82 3胃癌细胞形成明显的细胞病变效应、细胞生长抑制及细胞凋亡 ,且细胞凋亡率与感染时间呈正相关。G2、S期细胞减少 ,增殖指数 (PI)降低 ,与阴性对照组比较有显著性差异 (P<0 .0 1)。结论 :NDV具有显著的抗BGC - 82 3胃癌细胞活性。  相似文献   

9.
This study aims to elucidate the antiproliferative mechanism of hydroxychavicol(HC).Its effects on cell cycle,apoptosis,and the expression of c-Jun N-terminal kinase(JNK)and P38 mitogen-activated protein kinase(MAPK)in HT-29 colon cancer cells were investigated.HC was isolated from Piper betle leaf(PBL)and verified by high-performance liquid chromatography(HPLC),nuclear magnetic resonance(NMR),and gas chromatography-mass spectrometry(GC-MS).The cytotoxic effects of the standard drug 5-fluorouracil(5-FU),PBL water extract,and HC on HT-29 cells were measured after 24,48,and 72 h of treatment.Cell cycle and apoptosis modulation by 5-FU and HC treatments were investigated up to 30 h.Changes in phosphorylated JNK(pJNK)and P38(pP38)MAPK expression were observed up to 18 h.The half maximal inhibitory concentration(IC50)values of HC(30μg/mL)and PBL water extract(380μg/mL)were achieved at 24 h,whereas the IC50of 5-FU(50μmol/L)was obtained at 72 h.Cell cycle arrest at the G0/G1 phase in HC-treated cells was observed from12 h onwards.Higher apoptotic cell death in HC-treated cells compared to 5-FU-treated cells(P<0.05)was observed.High expression of pJNK and pP38 MAPK was observed at 12 h in HC-treated cells,but not in 5-FU-treated HT-29 cells(P<0.05).It is concluded that HC induces cell cycle arrest and apoptosis of HT-29 cells,with these actions possibly mediated by JNK and P38 MAPK.  相似文献   

10.
The significance of family influences for children’s development is beyond dispute. Social disparities in stimulation provided by families and their influence on cognitive competencies have frequently been pointed out. However, little notice has been attracted to the variety of everyday family activities and their importance for children’s behavioral and competence development. Focusing on 6 to 8 years old children (n?=?1,377), this paper investigates firstly which factors affect mothers’ education-oriented and outdoor activities with their child, children’s involvement in household chores and aspects of parenting. Secondly, we analyze how these different types of activities as well as the parenting climate relate to children’s problem behavior, prosocial behavior, and everyday language skills. Cross-sectional regression analyses point to advantages of high maternal education and child-centered parenting. High maternal educational resources facilitate a focus on education-oriented activities, while outdoor activities and children’s involvement in household chores stand back. In addition to child-centered parenting, features of everyday family activities prove relevant for children’s behavioral and competence development.  相似文献   

11.
淋球菌孔蛋白对淋球菌的存活和致病起着重要作用。它能促进淋球菌入侵宿主细胞,调控细胞凋亡,影响补体激活途径,充当免疫佐剂。深入研究孔蛋白的免疫功能,对阐明淋球菌的致病机制及宿主抗感染免疫机制具有重要意义。  相似文献   

12.
Human thioredoxin reductase (TrxR) system is associated with cancer cell growth and anti-apoptosis process. Effects of 1,2-[bis(1,2-benzisoselenazolone-3(2H)-ketone)]ethane (BBSKE), a novel TrxR inhibitor, were investigated on human leukemia cell lines HL-60 and K562. BBSKE treatment induced cell growth inhibition and apoptosis in both cell lines. Apoptosis induced by BBSKE is through Bcl-2/Bax and caspase-3 pathways. Ehrlich's ascites carcinoma-bearing mice were used to investigate the anti-tumor effect of BBSKE in vivo. Tumor-bearing mice treated with BBSKE showed an increase of life span with a comparable effect to cyclophosphamide (CTX). These results suggest a potential usage of BBSKE as a therapeutic agent against non-solid tumors.  相似文献   

13.
Cancer is the leading cause of death worldwide. Drugs play a pivotal role in cancer treatment, but the complex biological processes of cancer cells seriously limit the efficacy of various anticancer drugs. Autophagy, a self-degradative system that maintains cellular homeostasis, universally operates under normal and stress conditions in cancer cells. The roles of autophagy in cancer treatment are still controversial because both stimulation and inhibition of autophagy have been reported to enhance the effects of anticancer drugs. Thus, the important question arises as to whether we should try to strengthen or suppress autophagy during cancer therapy. Currently, autophagy can be divided into four main forms according to its different functions during cancer treatment: cytoprotective (cell survival), cytotoxic (cell death), cytostatic (growth arrest), and nonprotective (no contribution to cell death or survival). In addition, various cell death modes, such as apoptosis, necrosis, ferroptosis, senescence, and mitotic catastrophe, all contribute to the anticancer effects of drugs. The interaction between autophagy and these cell death modes is complex and can lead to anticancer drugs having different or even completely opposite effects on treatment. Therefore, it is important to understand the underlying contexts in which autophagy inhibition or activation will be beneficial or detrimental. That is, appropriate therapeutic strategies should be adopted in light of the different functions of autophagy. This review provides an overview of recent insights into the evolving relationship between autophagy and cancer treatment.  相似文献   

14.
This article addresses the use of cultural capital to influence therapeutic practices with culturally diverse clients. Using cultural wealth from a Critical Race Theory perspective (Yosso in Race Ethnicity and Education, 8(1), 69–91, 2005) highlights unacknowledged forms of cultural capital of diverse groups. Utilizing this perspective impacts counsellors’ positioning within the therapeutic relationship, shapes the discourse within therapy, and can enhance clients’ autonomous motivation within the therapeutic process. This article builds upon Yosso’s (Race Ethnicity and Education, 8(1), 69–91, 2005) forms of cultural wealth by situating them within a therapeutic context.  相似文献   

15.
目的:最近有研究表明卡非佐米(Carfilzominb,CFZ)能有效抑制肺腺癌细胞生长,但是其中的内在机制仍然需要进一步研究。本文针对CFZ抑制肺腺癌生长机制进行了系统研究。创新点:揭示了蛋白酶体抑制剂抗实体肿瘤的新机制,为这类药物用于实体肿瘤治疗提供了有利依据。同时Gadd45a可做为候选指标用于蛋白酶体抑制剂抗肿瘤疗效的预测。方法:应用流式细胞术检测CFZ对肺腺癌细胞周期和凋亡的影响;通过MTS比色法及平板克隆形成实验分析CFZ对肺腺癌细胞生长的抑制作用;使用蛋白质印迹法(western blot)和定量聚合酶链反应(qPCR)检测相关基因表达水平的改变。结论:CFZ通过AKT/FOXO3a通路上调Gadd45a基因的表达,诱导肺腺癌细胞周期阻滞和凋亡,从而发挥抗肿瘤效应。  相似文献   

16.
研究旨在通过MTT法从萘酰亚胺为母体合成的一系列化合物中,筛选出能够高效诱导肿瘤细胞凋亡的化合物C8。研究方法为选用不同组织来源的肿瘤细胞系MCF-7、Hela、U-251和SMMC-7721通过MTT比色法测定不同浓度的萘酰亚胺类化合物作用不同时间后对细胞体外培养的抑制影响。实验结果显示若干种亚胺类化合物中,只有化合物C8对上述肿瘤细胞的生长都具有明显的抑制作用,并随时间延长更为显著,其他化合物无显著性,进而推测化合物C8能够明显抑制不同组织来源的肿瘤细胞生长,并与剂量和时间呈正相关关系,具有高效诱导肿瘤细胞凋亡的作用。  相似文献   

17.
目的:研究新城疫病毒(NDV)感染对小鼠肉瘤S180细胞p53蛋白的表达及细胞周期的影响。方法:通过NDV体外感染小鼠肉瘤S180细胞,经倒置显微镜观察细胞形态变化,噻唑蓝(MTT)比色法检测小鼠肉瘤S180细胞的增殖状况;经流式细胞仪分析检测NDV体内感染后荷瘤鼠腹水中S180细胞分裂周期各时相的变化、细胞凋亡情况及细胞表面p53蛋白的表达情况。结果:NDV体内、外感染对小鼠肉瘤S180细胞的杀伤作用明显,NDV体内感染后荷瘤鼠腹水中S180细胞高表达p53蛋白,细胞凋亡率增加,G2/S期细胞减少,增殖指数(PI)降低,与阴性对照组比较有显著性差异(P<0.05)。结论:NDV感染可增强小鼠肉瘤S180细胞p53蛋白的表达,影响其细胞周期,诱导其凋亡且有较强的杀瘤作用。  相似文献   

18.
Mesenchymal stem cell(MSC)transplantation has shown a therapeutic potential to repair the ischemic and infracted myocardium,but the effects are limited by the apoptosis and loss of donor cells in host cardiac microenvironment.The aim of this study is to explore the cytoprotection of heat shock protein 90(Hsp90)against hypoxia and serum deprivation-induced apoptosis and the possible mechanisms in rat MSCs.Cell viability was determined by3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide(MTT)assay.Apoptosis was assessed by Hoechst 33258nuclear staining and flow cytometric analysis with annexin V/PI staining.The gene expression of Toll-like receptor-4(TLR-4)and V-erb-b2 erythroblastic leukemia viral oncogene homolog 2(ErbB2)was detected by real-time polymerase chain reaction(PCR).The protein levels of cleaved caspase-3,Bcl-2,Bcl-xL,Bax,total-ERK,phospho-ERK,totaI-Akt,phospho-Akt,and Hsp90 were detected by Western blot.The production of nitric oxide was measured by spectrophotometric assay.Hsp90 improves MSC viability and protects MSCs against apoptosis induced by serum deprivation and hypoxia.The protective role of Hsp90 not only elevates Bcl-2/Bax and Bcl-xL/Bax expression and attenuates cleaved caspase-3 expression via down-regulating membrane TLR-4 and ErbB2 receptors and then activating their downstream PI3K/Akt and ERK1/2 pathways,but also enhances the paracrine effect of MSCs.These findings demonstrated a novel and effective treatment strategy against MSC apoptosis in cell transplantation.  相似文献   

19.
For the past two hundred years in German educational science the ‘maths lesson’ of Plato’s Meno has received attention – always to be celebrated as a masterpiece of Socratic teaching. Yet, by taking only the ‘maths lesson’ into account the negative ending of Meno is overlooked. Thus, because generally the ‘maths lesson’ is used as an example for a positive Socratic maieutic teaching method, a second possible medical, ‘therapeutic’ link between a midwife, with which Socrates compares himself in Plato’s Theaetetus, and a torpedo fish, with which he equates himself in Meno, is usually overlooked.  相似文献   

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