Abstract:
:A promising family of anticancer agents, the camptothecins, is noted for their ability to induce apoptosis specifically in malignant cells. However, a major obstacle for successful cancer treatment by these and other chemotherapeutic agents is the intrinsic or acquired resistance to drug treatment. Resistance to 9NC6, a camptothecin derivative, has been modeled in vitro using a human prostate cancer cell line. To elucidate the mechanism for acquired 9NC resistance, we have used a subtractive cloning approach to identify genes whose altered expression level is reflective of 9NC resistance or susceptibility. Differential gene expression was compared between wild-type human prostate cancer cell line, DU-145, and a 9NC-resistant subline, RC1. Results were confirmed by Northern and Western blot analyses. In this report, we focus on one gene, 14-3-3zeta. An expression vector of a full-length myc-epitope-tagged 14-3-3zeta cDNA was constructed and used for transfection into DU-145 cells. We consistently observed that 14-3-3zeta message and protein levels were dramatically increased in 9NC resistant cells. The expression levels of other 14-3-3 family members were unaffected. Strikingly, ectopic overexpression of 14-3-3zeta in wild-type 9NC-susceptible prostate cancer cells decreased 9NC-induced apoptosis. Our results suggest a novel direct or indirect role of 14-3-3zeta in mediating resistance of DU-145 cells to the topoisomerase I inhibitor, 9NC. We are currently exploring whether this represents a more general pathway for drug resistance as well.
journal_name
Int J Oncoljournal_title
International journal of oncologyauthors
Chatterjee D,Goldman M,Braastad CD,Darnowski J,Wyche JH,Pantazis P,Goodglick Lkeywords:
subject
Has Abstractpub_date
2004-08-01 00:00:00pages
503-9issue
2eissn
1019-6439issn
1791-2423journal_volume
25pub_type
杂志文章abstract::Combination therapy is a promising and prevalent strategy for osteosarcoma treatment. Curcumin (CUR), as a chemosensitizer, improves the antitumor effect of first‑line chemotherapy drugs. However, due to its poor solubility and instability in physiological conditions, the bioavailability of CUR is limited. In order to...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:10.3892/ijo.2020.5067
更新日期:2020-08-01 00:00:00
abstract::Breast cancer (BC) is the most frequently malignancy in women. Therefore, establishment of an animal model for the development of preventative measures and effective treatment for tumors is required. A novel heterogeneous spontaneous mammary tumor animal model of Kunming mice was generated. The purpose of this study w...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:10.3892/ijo.2014.2657
更新日期:2014-12-01 00:00:00
abstract::Emerging evidence indicates that mesenchymal stem cells (MSCs) serve an indispensable role in the tumor microenvironment. However, whether MSCs participate in the development of oral carcinogenesis remains unclear. The present study isolated MSCs from clinical tissues and investigated the differences of MSCs derived f...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:10.3892/ijo.2019.4756
更新日期:2019-05-01 00:00:00
abstract::The failure of androgen deprivation therapy in prostate cancer treatment mainly results from drug resistance to androgen receptor antagonists. Although an aberrant caveolin‑1 (Cav‑1) expression has been reported in multiple tumor cell lines, it is unknown whether it is responsible for the progression of castration‑res...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:10.3892/ijo.2019.4774
更新日期:2019-06-01 00:00:00
abstract::Toxicity of polyphenols against rat 3Y1 fibroblasts and the cells transformed by human adenovirus (Ad12-3Y1), its EIA gene (EIA-3Y1), or simian virus 40 (SV-3Y1) was examined. Among the diphenol compounds examined, pyrocatechol (o-diphenol) and hydroquinone (p-diphenol) showed selective toxicity against Ad12-3Y1 and E...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:10.3892/ijo.2.1.89
更新日期:1993-01-01 00:00:00
abstract::To investigate the usefulness of oral doxifluridine (5'-DFUR), an active intermediate metabolite of capecitabine (XELODA), in gastric cancer patients after curative resection, we conducted a phase III randomized controlled study to compare oral 5'-DFUR and oral 5-fluorouracil (5-FU). 485 gastric cancer patients with S...
journal_title:International journal of oncology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.3892/ijo.16.5.1021
更新日期:2000-05-01 00:00:00
abstract::Expression of E-cadherin in esophageal carcinoma was studied immunohistochemically in 65 patients using an anti-human E-cadherin monoclonal antibody (HECD-1). In normal esophageal epithelium, E-cadherin was strongly expressed on cell-cell boundaries. On the contrary, a reduced E-cadherin expression (Rd-type) was frequ...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:
更新日期:1994-01-01 00:00:00
abstract::The inhibitory effects of macrolide antibiotics including clarithromycin (CAM) on autophagy flux have been reported. Although a macrolide antibiotic exhibits no cytotoxicity, its combination with bortezomib (BZ), a proteasome inhibitor, for the simultaneous blocking of the ubiquitin (Ub)‑proteasome and autophagy‑lysos...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:10.3892/ijo.2014.2773
更新日期:2015-02-01 00:00:00
abstract::Resveratrol and other polyphenols have anti-carcinogenic and anti-tumorigenic activities in various carcinomas. However, such studies are limited in endometrial cancer. We hypothesize that resveratrol suppresses cancer growth through modulation of cell cycle and cell growth regulatory genes. To test this hypothesis, w...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:
更新日期:2003-10-01 00:00:00
abstract::The lack of good molecular markers for diagnosis as well as treatment assessment has rendered the hepatocellular carcinoma (HCC) a major challenge in health care. In this study, woodchucks were used as an animal model for hepatitis virus-induced HCC, and gene expression studies were performed using a human oligonucleo...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:
更新日期:2007-01-01 00:00:00
abstract::VSELs are a population of rare Oct-4+CXCR4+ CD133+lin-CD45- cells that are deposited during early embryogenesis in developing organs/tissues as a reserve population of pluripotent stem cells for regeneration. We reported recently that they are mobilized into peripheral blood during acute myocardial infarction (AMI) in...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:10.3892/ijo_00000671
更新日期:2010-08-01 00:00:00
abstract::The insulin-like growth factors (IGFs) are a family of mitogenic proteins involved in the regulation of cell growth and differentiation. The presence and role of the IGF system in oral mucosal epithelium is not clear but could influence our understanding of the pathogenesis of oral cancer. We characterised the express...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:
更新日期:2007-10-01 00:00:00
abstract::Retroviral infection of hTERT, the catalytic component of telomerase, into BJ fibroblasts (population doubling 28) resulted in reconstitution of telomerase activity, telomere maintenance, and extension of in vitro lifespan. The hTERT-infected cells also exhibited increased growth rate and colony forming efficiency rel...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:
更新日期:2002-06-01 00:00:00
abstract::Tripartite motif 16 (TRIM16), a member of the RING B-box coiled-coil (RBCC)/tripartite totif (TRIM) protein family, has been demonstrated to have significant effects on tumor migration by previous studies, but its specific contribution to hepatocellular carcinoma (HCC) is currently unknown. The aim of this study was t...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:10.3892/ijo.2016.3398
更新日期:2016-04-01 00:00:00
abstract::A precise diagnosis of peritoneal dissemination is necessary to determine the appropriate treatment strategy for colorectal cancer. However, small peritoneal dissemination is difficult to diagnose. 5-aminolevulinic acid (5-ALA) is an intermediate substrate of heme metabolism. The administration of 5-ALA to cancer pati...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:10.3892/ijo.2014.2417
更新日期:2014-07-01 00:00:00
abstract::We report here that lysocellin, a polyether antibiotic from a streptomycete, induces G1 phase arrest in human osteosarcoma MG63 cells. Lysocellin up-regulates p21WAF1/Cip1 and down-regulates cyclin D1 at the mRNA level. In addition, cyclin D1 is down-regulated by the proteasome-dependent signal pathway in MG63 cells. ...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:
更新日期:2006-04-01 00:00:00
abstract::The efficacy of radioimmunotherapy with radiolabelled monoclonal antibody (Mab) depends on the amount of antibody taken up by the tumour and on its intratumoral distribution. Multicellular spheroids (MTS) of lung cell carcinoma was investigated to study cellular and subcellular distribution of a Mab Po66 labelled with...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:10.3892/ijo.10.3.609
更新日期:1997-03-01 00:00:00
abstract::Previous studies have revealed that protein kinase C (PKC) is responsible for malignant progression. In the present study, we investigated the potent inhibitory effects of an antiestrogen, toremifene, on PKC-mediated cellular adhesion. A phorbol ester, phorbol 12-myristate 13-acetate (PMA), significantly enhanced alph...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:10.3892/ijo.13.5.981
更新日期:1998-11-01 00:00:00
abstract::Thirty-three adult patients with anaplastic astrocytoma or glioblastoma multiforme, verified between 1990 and 1997, received postoperative intra-arterial ACNU chemotherapy and irradiation. Since our previous strategies to malignant gliomas had included intra-venous ACNU, the purpose of the present study is to evaluate...
journal_title:International journal of oncology
pub_type: 临床试验,杂志文章
doi:10.3892/ijo.13.3.537
更新日期:1998-09-01 00:00:00
abstract::Most malignant tumors have a defect in the Rb pathway that allows them to proliferate autonomously, unrestricted by the availability of mitogens and growth factors. This defect preconditions tumor cells to be less sensitive to inhibitors of growth factor receptors and/or signal transduction pathways that arrest normal...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:10.3892/ijo.19.4.811
更新日期:2001-10-01 00:00:00
abstract::The effect of immune cells on the growth and development of human prostatic cancer cells was investigated. Cell proliferation of androgen-independent human prostatic cancer cells JCA-1 was reduced 30-40% with the supplementation of a growth modulating activity present in lymphocyte conditioned medium. The slower growi...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:10.3892/ijo.5.4.979
更新日期:1994-10-01 00:00:00
abstract::Conventional diagnosis of prostate cancer does not appear to be sensitive enough to differentiate pre-operatively between organ-confined and extracapsular disease. New technologies, arising from the field of molecular biology, have been introduced to improve diagnosis and their implementation into the clinical practic...
journal_title:International journal of oncology
pub_type: 杂志文章,评审
doi:
更新日期:2005-03-01 00:00:00
abstract::Collagen type I is an abundant component of the extracellular matrix and due to its longevity, constitutes a prominent target of non-enzymatic post-translational in vivo modifications such as carbamylation and glycation. These protein modifications involved in aging, renal diseases and diabetes, are linked to elevated...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:10.3892/ijo.2012.1393
更新日期:2012-06-01 00:00:00
abstract::Regulatory T cells (CD4+CD25+FoxP3+, Treg) have been shown to play a major role in suppression of the immune response to malignant gliomas. In this study, we investigated the kinetics of Treg infiltration in metastatic brain tumor models, including melanoma, breast and colon cancers. Our data indicate that both CD4+ a...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:10.3892/ijo_00000282
更新日期:2009-06-01 00:00:00
abstract::Early detection and treatment are critical in the management of renal cell carcinoma (RCC). However, there is no standard serum biomarker to facilitate early diagnosis or prognostic stratification in patients with RCC. Recent reports suggest that circulating microRNAs (miRNAs) have great potential as biomarkers for di...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:10.3892/ijo.2013.2169
更新日期:2014-01-01 00:00:00
abstract::SOX2, a SRY-related HMG box protein, is thought to be an important transcription factor during organogenesis, including the stomach although the expression and function are unclear. We investigated SOX2 protein expression to clarify its roles in differentiation and carcinogenesis of the stomach. Using polyclonal SOX2 ...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:
更新日期:2004-02-01 00:00:00
abstract::Induction of the B7 family molecules by 12-O-tetradecanoyl phorbol 13-acetate (TPA) has been reported, however, the mechanism by which TPA up-regulates these molecules remains poorly understood. In this study, the expression of B7-DC, -H1, -H2, and -H3 in response to TPA was markedly induced in K562 cells. TPA also in...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:
更新日期:2007-12-01 00:00:00
abstract::A 60 year old man had two tumours resected from his liver which were shown histologically to be a well differentiated hepatocellular carcinoma and the fibrolamellar variant. Both are considered clinically distinct and of different pathogenesis and have not been previously reported occurring synchronously. DNA analysis...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:
更新日期:1992-07-01 00:00:00
abstract::Paclitaxel (taxol) has been used for the treatment of various human tumors and is an exceedingly efficient chemotherapy agent against esophageal cancer. However, the precise molecular mechanisms of paclitaxel effects on human esophageal adenocarcinoma cells are not well understood. MTT assay and cell cycle analysis we...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:10.3892/ijo.2011.1135
更新日期:2011-12-01 00:00:00
abstract::Head and neck squamous cell carcinoma (HNSCC) poses a significant challenge clinically where one of the mechanisms responsible for the invasion into facial bones occurs via the activation of osteoclasts. Copper has been demonstrated to play a key role in skeletal remodeling. However, the role of copper in cancer-assoc...
journal_title:International journal of oncology
pub_type: 杂志文章
doi:10.3892/ijo.2018.4242
更新日期:2018-03-01 00:00:00