Abstract:
PURPOSE:An intact and fully functional multiprotein DNA replication complex (DNA synthesome) from human as well as from murine mammary carcinoma cells was first isolated and characterized in our laboratory. The human cell synthesome supports the in vitro origin-specific simian virus 40 (SV40) DNA replication reaction in the presence of the viral large T-antigen using a semiconservative mechanism and has been shown to contain all the proteins and enzymes required to support DNA synthesis. We are currently using the DNA synthesome as a unique model for analyzing the mechanism of action of anticancer drugs affecting DNA replication. The purpose of this study was to further investigate the mechanism of action of ara-C using the DNA synthesome isolated from the human breast cancer cell line MDA MB-468. METHODS:Synthesome-mediated SV40 DNA replication was performed in the presence of various concentrations of ara-CTP (the active metabolite of ara-C) and the types of daughter DNA molecules produced were analyzed lusing neutral and alkaline gel electrophoresis. We also examined the effect of ara-C on intact MDA MB-468 cell DNA synthesis and on cell proliferation. In addition, we studied the effect of ara-CTP on the activity of some of the synthesome target proteins (the DNA polymerases alpha and delta). RESULTS:Full-length daughter DNA molecules were obtained in the presence of low concentrations of ara-CTP while at higher concentrations, there was an inhibition of full-length daughter DNA synthesis. The findings suggest that specifically the initiation phase of DNA synthesis was inhibited by ara-CTP since the production of the short Okazaki fragments was suppressed at all concentrations of the drug above 10 microM. In addition, it was found that the IC50 of ara-CTP for inhibition of synthesome-mediated in vitro DNA replication was comparable to that required to inhibit intact cell DNA synthesis. Further experimentation has shown that ara-CTP preferentially inhibits the activity of the synthesome-associated DNA polymerase alpha enzyme while the DNA polymerase delta seems to be resistant to the inhibitory effect of that drug. CONCLUSIONS:Our results indicate that ara-C's action on DNA replication is mediated primarily through DNA polymerase alpha and suggest that this enzyme plays a key role in DNA synthetic initiation events. The results also provide definitive support for the use of the DNA synthesome as a unique and powerful model for analyzing the mechanism of action of anticancer drugs which directly affect DNA replication.
journal_name
Cancer Chemother Pharmacoljournal_title
Cancer chemotherapy and pharmacologyauthors
Abdel-Aziz W,Jiang HY,Hickey RJ,Malkas LHdoi
10.1007/s002800050046keywords:
subject
Has Abstractpub_date
2000-01-01 00:00:00pages
312-9issue
4eissn
0344-5704issn
1432-0843journal_volume
45pub_type
杂志文章abstract:PURPOSE:Based on the promising results of a Phase I study with a combination of gemcitabine and DTIC performed in advanced soft tissue sarcoma (ASTS) patients, and due to the limited efficacy of second or third line therapies in those patients, we designed a Phase II study to determine the activity of this new regimen....
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-006-0263-0
更新日期:2007-02-01 00:00:00
abstract:PURPOSE:Evasion to new treatments of advanced melanoma is still associated with a poor prognosis. Choosing the best combination of agents that can bypass resistance mechanisms remains a challenge. Sphaeropsidin A (Sph A) is a fungal bioactive secondary metabolite previously shown to force melanoma cells to undergo apop...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-017-3293-x
更新日期:2017-05-01 00:00:00
abstract::The effects of intravesical chemoimmunotherapy with epirubicin and bacillus Calmette-Guérin (BCG) for prophylaxis of recurrence of superficial bladder cancer (pTa, pT1) were investigated in 29 patients aged a median of 70 years between January of 1991 and May of 1993. The patients received intravesical instillation of...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 临床试验,杂志文章
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abstract:PURPOSE:To explore the clinical significance of plasma D-dimer increase for transcatheter arterial chemoembolization (TACE) in patients with primary liver cancer (PLC). METHODS:The clinical data of 80 PLC patients who underwent TACE in our hospital from January 2015 to January 2017 were collected, including the plasma...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-019-03778-6
更新日期:2019-04-01 00:00:00
abstract:PURPOSE:Multi-drug resistance and cumulative cardiotoxicity are major limitations for the clinical use of anthracyclines. Here, we evaluated and compared the cross-resistance of amrubicin, a third-generation synthetic anthracycline and potent topoisomerase (topo)-II inhibitor with little or no observed cardiotoxicity t...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-011-1782-x
更新日期:2012-04-01 00:00:00
abstract::Anthracyclines are powerful cytotoxic agents, used as first-line treatment of leukemias and many other tumors, but host-tissue toxicity is their main dose-limiting factor. However, their therapeutic effects depend not only on the toxicity, hence on the dose, but also on drug resistance. Among the mechanisms that can a...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-005-0043-2
更新日期:2006-04-01 00:00:00
abstract::MKT-077 (1-ethyl-2-[[3-ethyl-5-(3-methylbenzothiazolin-2-yliden)]-4- oxothiazolidin-2-ylidenemethyl] pyridinium chloride), a novel rhodacyanine dye in phase I/II clinical trials, may provide a new approach to cancer therapy based on the accumulation in the mitochondria of the cells of certain carcinomas, for example, ...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s002800050898
更新日期:1999-01-01 00:00:00
abstract:PURPOSE:Stress conditions, such as glucose starvation and hypoxia, that induce glucose-regulated proteins (GRPs) in cells, are seen in most solid tumors. These conditions have been shown to cause cellular resistance to multiple anticancer drugs, such as etoposide, doxorubicin, and camptothecin. We examined the effect o...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s002800050945
更新日期:1999-01-01 00:00:00
abstract:PURPOSE:Ibrutinib is an orally administered, irreversible Bruton's tyrosine kinase inhibitor for treatment of B-cell malignancy. This study evaluated the effects of single-dose ibrutinib at therapeutic and supratherapeutic exposures on cardiac repolarization in healthy subjects. METHODS:Part 1 used an open-label, two-...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-017-3471-x
更新日期:2017-12-01 00:00:00
abstract::Use of cross-sectional imaging to identify whole-body lean soft-tissue mass has recently emerged as an attractive prognostic factor for chemotherapy toxicities. Beyond that, there is increasing interest in use of lean soft-tissue mass as a more accurate method for dosing chemotherapy, as compared to body surface area....
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章,评审
doi:10.1007/s00280-018-3614-8
更新日期:2018-07-01 00:00:00
abstract::The effects of BCNU, CCNU, methyl-CCNU, streptozotocin, and chlorozotocin on calmodulin activity were studied in vitro and in vivo. Preincubation of BCNU, CCNU, and methyl-CCNU with calmodulin produced a concentration-dependent inhibition of in vitro calmodulin activity expressed as stimulation of cyclic nucleotide ph...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/BF00434354
更新日期:1985-01-01 00:00:00
abstract:PURPOSE:Based on the preclinical evidence of topoisomerase I (Topo-1) upregulation by mitomycin C(MMC) and decreased NF-kappaB activation by celecoxib, we evaluated combinations of irinotecan/MMC and irinotecan/MMC/celecoxib in patients with advanced solid malignancies. PATIENTS-METHODS:Initially, patients received MM...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-008-0826-3
更新日期:2009-05-01 00:00:00
abstract::The value of estrogen receptor (ER) status in the prediction of tumor response to combination chemotherapy was retrospectively analyzed in breast cancer patients selected for prospective controlled trials of chemotherapy (85 with advanced disease and 256 with operable tumors). All patients were previously untreated wi...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 临床试验,杂志文章
doi:10.1007/BF00255456
更新日期:1980-01-01 00:00:00
abstract::Dose fractionation is known to reduce the toxicity of ifosfamide and also results in an increased production of alkylating metabolites. Administration by slow infusion using the convenience of ambulatory pumps is therefore of interest. We used HPLC to investigate the stability of ifosfamide in aqueous solution (either...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/BF02897261
更新日期:1990-01-01 00:00:00
abstract::NQO1 is a reductive enzyme that is important for the activation of many bioreductive agents and is a target for an enzyme-directed approach to cancer therapy. It can be selectively induced in many tumor types by a number of compounds including dimethyl fumarate and sulforaphane. Mitomycin C is a bioreductive agent tha...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-004-0961-4
更新日期:2005-09-01 00:00:00
abstract::The chemotherapeutic effects of all-trans-retinoic acid (atRA) are mediated by the retinoic acid receptor beta (RARbeta), but RARbeta expression is reduced in a number of head and neck carcinoma (HNSCC) cells which causes resistance to RA treatment in half the patients with HNSCC. The possible mechanism for the reduce...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-004-0970-3
更新日期:2005-11-01 00:00:00
abstract:PURPOSE:Busulfan (Bu) exposure is critical for efficacy and safety. Body weight (BW), or adjusted ideal body weight (AIBW)-based dosing (WBD) algorithm, has been used in hematopoietic stem cell transplantation (HSCT). A recently completed phase 2 study revealed that 33.6 % of the subjects were under-, or over-exposed, ...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-014-2660-0
更新日期:2015-03-01 00:00:00
abstract:PURPOSE:Malignant pleural mesothelioma (MPM) is a highly lethal neoplasm. S-1 has been developed as a novel oral antineoplastic agent based on the modulation of 5-fluorouracil (5-FU) bioactivity. This study was conducted to investigate the preclinical therapeutic effect of S-1 on MPM. METHODS:We used three human MPM c...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-010-1503-x
更新日期:2011-08-01 00:00:00
abstract::PSC-833, a non immunosuppressive analogue of cyclosporin A, is an effective modulator of the multidrug-resistant tumor phenotype. Since both PSC-833 and cyclosporin A also enhance the cytotoxicity of VP-16 against drug sensitive L1210 leukemia cells in vitro we compared these agents as modulators of VP-16 efficacy in ...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s002800050597
更新日期:1997-01-01 00:00:00
abstract:PURPOSE:The survival benefit of chemotherapy (CTx) compared with best supportive care (BSC) is unclear in patients with recurrent or metastatic esophageal squamous cell carcinoma (R/M-ESCC) previously treated with fluorouracil (FU), platinum (PT), and taxane (TAX). PATIENTS AND METHODS:The data of 283 consecutive pati...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章,多中心研究
doi:10.1007/s00280-016-3179-3
更新日期:2016-12-01 00:00:00
abstract::Antibodies can be used to target cancer therapies to malignant tissue; the approach is attractive because conventional treatments such as chemo- and radiotherapy are dose limited due to toxicity in normal tissues. Effective targeting relies on appropriate pharmacokinetics of antibody-based therapeutics, ideally showin...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章,评审
doi:10.1007/pl00014055
更新日期:2000-01-01 00:00:00
abstract:PURPOSE:To investigate the effect of the antihistamine ketotifen on multidrug resistance in human breast cancer cells and doxorubicin toxicity in mice. METHODS:Clonogenicity assays were used to test the effect of ketotifen on human multidrug resistant breast cancer cell lines exposed to chemotherapeutic agents. Flow c...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-003-0600-5
更新日期:2003-05-01 00:00:00
abstract::Tumor-tissue and plasma concentrations of platinum were studied prospectively in two groups of eight patients who were suffering from advanced non-small-cell lung cancer. Treatments including two different schedules of cisplatin administration (25 vs 100 mg/m2 on day 1) were compared. At 30 min after the beginning of ...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/BF00689280
更新日期:1990-01-01 00:00:00
abstract::2'-deoxycoformycin (2'-dCF; Pentostatin), a stoichiometric inhibitor of mammalian adenosine deaminase (ado deaminase), exhibits immunosuppressive and antilymphocytic activity in animal test systems. A clinical pharmacology/phase I study of 2'-dCF administered as a single agent has been completed (18 patients). Dose le...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/BF00435411
更新日期:1980-01-01 00:00:00
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journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-006-0285-7
更新日期:2007-03-01 00:00:00
abstract:PURPOSE:In vitro and in vivo preclinical models have demonstrated synergistic activity when topoisomerase I and II inhibitors are administered sequentially. Topoisomerase I inhibitors increase topoisomerase II levels and increase cell kill induced by topoisomerase II poisons. We evaluated this hypothesis in a cohort of...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 临床试验,杂志文章
doi:10.1007/s002800000211
更新日期:2001-01-01 00:00:00
abstract::A group of folate analogs of the 10-deaza-aminopterin series, which were designed on the basis of the results of an intensive biochemical and pharmacokinetic program, have been examined in therapy experiments utilizing a group of murine tumor models. These new analogs were found to be markedly superior to methotrexate...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:
更新日期:1984-01-01 00:00:00
abstract:BACKGROUND:3-Aminopyridine-2-carboxaldehyde thiosemicarbazone (3-AP) is a novel small-molecule ribonucleotide reductase inhibitor. This study was designed to estimate the maximum tolerated dose (MTD) and oral bioavailability of 3-AP in patients with advanced-stage solid tumors. METHODS:Twenty patients received one dos...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-011-1779-5
更新日期:2012-03-01 00:00:00
abstract:PURPOSE:The chimeric protein BCR-ABL, a constitutively active protein-tyrosine kinase, triggers downstream signalling proteins, such as STAT3, ultimately resulting in the survival of myeloid progenitors in BCR-ABL-positive leukemias. Here, we evaluated the effect of LLL-3, an inhibitor of STAT3 activity, on cell viabil...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-009-1109-3
更新日期:2010-05-01 00:00:00
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journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-020-04213-x
更新日期:2021-01-05 00:00:00