Abstract:
OBJECTIVES:To investigate the effects and potential mechanisms of gambogic acid (GA), a naturally occurring anticancer agent, on the expression and regulation of telomerase in human gastric carcinoma cells. METHODS:GA-induced inhibition of cell proliferation was evaluated by the commonly employed MTT assay on two human gastric carcinoma cell lines, MGC-803 and SGC-7901. Telomerase activity and hTERT mRNA expression were determined by telomeric repeat amplication protocol-polymerase chain reaction and reverse transcription-polymerase chain reaction, respectively. The hTERT promoter activity was measured by luciferase assay. The expression of c-MYC, an apoptotic gene that modulates the expression of hTERT promoter, was quantified by Western blotting. RESULTS:The proliferation of human gastric carcinoma cell lines, MGC-803 and SGC-7901, was significantly inhibited with GA treatment. Both telomerase activity and hTERT mRNA expression were notably decreased in cells treated with GA. The activity of hTERT promoter and the expression of c-MYC were also remarkably decreased in GA-treated cells. CONCLUSION:This study demonstrated that GA treatment of human gastric carcinoma cell lines, MGC-803 and SGC-7901, significantly reduced the expression of c-MYC in a time- and concentration-dependent manner accompanied with the down-regulation of the hTERT transcription and the ultimate reduction in telomerase activity. Our results indicate that the hTERT is a target of c-MYC activity and identify a feasible mechanism of GA's potent anticancer activity.
journal_name
Cancer Chemother Pharmacoljournal_title
Cancer chemotherapy and pharmacologyauthors
Yu J,Guo QL,You QD,Lin SS,Li Z,Gu HY,Zhang HW,Tan Z,Wang Xdoi
10.1007/s00280-005-0177-2keywords:
subject
Has Abstractpub_date
2006-10-01 00:00:00pages
434-43issue
4eissn
0344-5704issn
1432-0843journal_volume
58pub_type
杂志文章abstract:PURPOSE:To investigate the synergistic cytotoxicity of TRAIL in combination with chemotherapeutic agents in A549 cell lines, we systematically evaluated the cytotoxicity of TRAIL alone and TRAIL in combination with cisplatin, paclitaxel (Taxol) or actinomycin D in A549 cell lines in vitro and in vivo, and whether the s...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-004-0867-1
更新日期:2005-02-01 00:00:00
abstract:PURPOSE:We evaluated the efficacy and safety of capecitabine and temozolomide (CAPTEM) in patients with metastatic neuroendocrine tumors (NETs) to the liver. This regimen was based on our studies with carcinoid cell lines that showed synergistic cytotoxicity with sequence-specific dosing of 5-fluorouracil preceding tem...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-012-2055-z
更新日期:2013-03-01 00:00:00
abstract:PURPOSE:Oxaliplatin (OHP) in combination with 5-fluorouracil/leucovorin (FOLFOX) is clinically used as frontline therapy in patients with advanced colorectal carcinoma (CRC), with response rates ranging from 46 to 71%. This combination is now considered a standard treatment for metastatic CRC and also in the post-opera...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-010-1476-9
更新日期:2011-04-01 00:00:00
abstract::The dextromethorphan-O-demethylase activity determined in human liver microsomes was used to screen various anticancer drugs for their ability to inhibit this cytochrome CYP2D6-dependent activity. Competitive inhibition indicates that the drug binds the enzyme and is potentially subjected to a polymorphic metabolism. ...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/BF00685896
更新日期:1993-01-01 00:00:00
abstract:PURPOSE:The purpose of this study was to assess the therapeutic and toxicological effects of cesium chloride (CsCl) administration in mice bearing prostate cancer tumors. METHODS:Three CsCl dose titration studies were completed in tumor-bearing and non-tumor-bearing athymic nude mice. All mice were administered either...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-007-0429-4
更新日期:2007-11-01 00:00:00
abstract::A total of 20 adults patients presenting with previously untreated lymphoblastic lymphoma underwent an intensive chemotherapy protocol. Either the BACOP or the m-BACOD regimen was used for induction. If the patients achieved a complete clinical remission (CR) after three courses, they were given intensive consolidatio...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/BF00686341
更新日期:1991-01-01 00:00:00
abstract:PURPOSE:A metronomic schedule of chemotherapy (resulting in a greater frequency of drug delivery) has shown efficacy in head and neck cancer. Our aim was to investigate the overall survival in tongue cancer patients with metronomic neoadjuvant chemotherapy with bleomycin compared to those with surgery alone. METHODS:I...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-016-3141-4
更新日期:2016-10-01 00:00:00
abstract:PURPOSE:The purpose of this investigation was to synthesize a series of thiolo-, thiono- and dithiocarbonate and thiocarbamate derivatives of 4-demethylpenclomedine (DM-PEN), the major plasma metabolite of penclomedine (PEN) in patients observed subsequently to be an active antitumor agent and non-neurotoxic in a rat m...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-005-0031-6
更新日期:2006-01-01 00:00:00
abstract:PURPOSE:The ErbB family members are protein tyrosine kinases, which play a crucial role in the signal transduction pathways that regulate key cellular functions. Overexpression of the ErbB family members is associated with oncogenicity, metastatic potential, cell proliferation, apoptosis, angiogenesis, and prognosis in...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章,评审
doi:10.1007/s00280-011-1748-z
更新日期:2011-12-01 00:00:00
abstract:PURPOSE:The objectives of this phase I dose-finding study of erlotinib were to investigate the toxicity profile, to confirm the acceptable toxicity of doses up to 150 mg/day, and to assess the pharmacokinetic (PK) profile and antitumor activity in Japanese patients with solid tumors. PATIENTS AND METHODS:Patients with...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-007-0494-8
更新日期:2008-03-01 00:00:00
abstract::Carboplatin is an alternative for cisplatin in the treatment of urothelial cancers. A pharmacologically guided phase I study of carboplatin in combination with methotrexate (30 mg/m2) and vinblastine (4 mg/m2) was conducted in ten patients by increment of the area under the plasma concentration versus time curve (AUC)...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 临床试验,杂志文章
doi:10.1007/s002800050252
更新日期:1995-01-01 00:00:00
abstract::We studied serum lipid and lipoprotein changes occurring during chemotherapy in 57 patients with chemosensitive cancers, including 18 malignant lymphomas, 18 breast carcinomas, 14 small-cell lung carcinomas, and 7 urothelial-cell carcinomas. Patients who responded favorably to chemotherapy demonstrated a significant i...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/BF00689971
更新日期:1992-01-01 00:00:00
abstract:PURPOSE:P-glycoprotein is a 170-kDa plasma membrane multidrug transporter that actively exports cytotoxic substances from cells. Overexpression of P-glycoprotein by tumor cells is associated with a multidrug-resistant phenotype. Immunosuppressive agents such as cyclosporins and macrolides, have been shown to attenuate ...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s002800050960
更新日期:1999-01-01 00:00:00
abstract:PURPOSE:Valproic acid (VPA), a widely used antiepileptic, also inhibits histone deacetylase (HDAC), and is undergoing evaluation as an anti-cancer agent. We studied the pharmacokinetics of VPA in the plasma and cerebrospinal fluid (CSF) in a non-human primate model that is highly predictive of human CSF penetration to ...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-007-0519-3
更新日期:2008-04-01 00:00:00
abstract:BACKGROUND:Camptothecin (CPT) is an anticancer agent that kills cells by converting DNA topoisomerase I into a DNA-damaging agent. Although CPT and its derivatives are now being used to treat tumors in a variety of clinical protocols, the low water solubility of the drug and its unique pharmacodynamics and reactivity i...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-002-0463-1
更新日期:2002-08-01 00:00:00
abstract::The purpose of this study was to examine the efficacy of a combination treatment of sequential irinotecan and doxifluridine, an intermediate of capecitabine, evaluated by the response rate and safety in patients with metastatic colorectal cancer. In all, 60 metastatic colorectal cancer patients with measurable disease...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章,meta分析
doi:10.1007/s00280-007-0471-2
更新日期:2008-02-01 00:00:00
abstract::Breast cancer is presently the most predominant tumor type and the second leading cause of tumor-related deaths among women. Although advancements in diagnosis and therapeutics have momentously improved, chemoresistance remains an important challenge. Tumors oppose chemotherapeutic agents through a variety of mechanis...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章,评审
doi:10.1007/s00280-020-04222-w
更新日期:2021-01-09 00:00:00
abstract::Levels of radioactivity and total anthracycline fluorescence in tissues of A/JAX mice were compared 1 h after IV administration of unlabeled or [14C]-labeled AD 32 (50 mg/kg). Highest levels of both fluorescence and radioactivity were found in the small intestine (including contents) and liver, a result consistent wit...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/BF00253006
更新日期:1981-01-01 00:00:00
abstract::Previous studies have demonstrated that treatment with fludarabine 4 h prior to arabinosylcytosine (ara-C) potentiates the accumulation of the active triphosphate of ara-C (ara-CTP) in leukemic lymphocytes. The clinical efficacy of this combination was evaluated in 15 patients with chronic lymphocytic leukemia (CLL) t...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/BF00686108
更新日期:1994-01-01 00:00:00
abstract:PURPOSE:The observation that the orphan drug dichloroacetate (DCA) selectively promotes mitochondria-regulated apoptosis and inhibits tumour growth in preclinical models by shifting the glucose metabolism in cancer cells from anaerobic to aerobic glycolysis attracted not only scientists', clinicians' but also patients'...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-010-1361-6
更新日期:2011-03-01 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
abstract:PURPOSE:This study aimed at investigating the anti-tumor effect of arsenic sulfide (As2S2) against liver cancer both in vivo and in vitro and to elucidate its underlying mechanisms. METHODS:Cell viability of the human hepatocellular carcinoma cell lines SMMC-7721, BEL-7402, HepG2 were measured by CCK-8 assay. The effe...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-018-3755-9
更新日期:2019-03-01 00:00:00
abstract:PURPOSE:To gain a better understanding of the impact of postprogression survival (PPS) and post-trial anticancer therapy on overall survival (OS) in first-line pancreatic cancer patients. METHODS:A literature search identified 54 randomized trials, focusing on gemcitabine monotherapy to eliminate effects of heterogene...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章,meta分析,评审
doi:10.1007/s00280-017-3263-3
更新日期:2017-03-01 00:00:00
abstract:PURPOSE:Since the hypothesis that solid tumors cause angiogenesis by secreting pro-angiogenic factors was introduced, research on angiogenesis has proceeded continuously. Development of inhibitors targeting the angiogenic tyrosine kinases, to block downstream signal transduction pathways, has become an important approa...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章,评审
doi:10.1007/s00280-016-2961-6
更新日期:2016-05-01 00:00:00
abstract:PURPOSE:The established treatment for small-cell lung cancer has been a cisplatin-etoposide combination, as the most effective chemotherapy regimen. Paclitaxel has also been used in combination with cisplatin and etoposide but this has been unacceptable due to the toxicity. This toxicity could be attributed to the thre...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章,多中心研究
doi:10.1007/s00280-012-2022-8
更新日期:2013-02-01 00:00:00
abstract:BACKGROUND:Epidemiologic and preclinical data suggest isoflavones have anticancer activity in colorectal malignancy prevention and treatment. This is the first clinical trial assessing safety and tolerability of Genistein in combination with chemotherapy in metastatic colorectal cancer. METHODS:Patients who had histol...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-019-03886-3
更新日期:2019-09-01 00:00:00
abstract::A sensitive solid-phase-extraction and high-performance liquid chromatography (HPLC) method has been developed to investigate the pharmacokinetics and metabolism of the hypoxic-cell cytotoxic agent tirapazamine (1,2,4-benzotriazine-3-amine 1,4-di-N-oxide; WIN 59075, SR 4233), currently in phase I/II studies in the Uni...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/BF00685859
更新日期:1995-01-01 00:00:00
abstract::Leukemic cells from seven patients with acute nonlymphoblastic leukemia and granulocytes, and mononuclear cells from three healthy controls were isolated by centrifugation on metrozoate-dextran. The intracellular accumulation of both the free and DNA-bound forms of daunorubicin and doxorubicin was studied in vitro. Th...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/BF00253105
更新日期:1979-01-01 00:00:00
abstract::Selective protection of the normal host tissues from the toxic effects of anticancer agents would allow the use of higher, probably more effective, doses of the drugs. It has been demonstrated that delayed high-dose uridine administration after 5-fluorouracil decreases the extent of myelosuppression and causes faster ...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/BF00685843
更新日期:1993-01-01 00:00:00
abstract:PURPOSE:High-dose methotrexate (HD-MTX) is widely used in the treatment of non-Hodgkin lymphoma (NHL), but the pharmacokinetic properties of HD-MTX in Chinese adult patients with NHL have not yet been established through an approach that integrates genetic covariates. The purposes of this study were to identify both ph...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-020-04058-4
更新日期:2020-05-01 00:00:00