Abstract:
:Elevated cyclooxygenase-2 (COX-2) expression has been observed in various types of cancer. Induction of COX-2 expression has been reported to increase invasiveness and angiogenesis of tumours. While COX-2 overexpression has been repeatedly proven to promote tumor growth, little is known about what initiates its induction. There has been evidence to suggest that COX-2 expression is normally suppressed by wild-type p53 but not mutant p53, suggesting that loss of p53 function may result in the induction of COX-2 expression. Loss of p53 function is not only caused by gene mutation, but also through the overexpression of its negative regulator, so called human double minute 2 (hdm2). The aim of this study was to examine the correlation between COX-2 overexpression, p53 accumulation and HDM2 overexpression, as indications of p53 anomalies, and their relationship to clinicopathologic features of colorectal adenocarcinoma. Tumor tissues and the adjacent normal mucosa were obtained from 73 colorectal cancer patients who underwent curative resection at Maharaj Nakorn Chiang Mai Hospital. Protein levels of COX-2, p53 and HDM2 were determined by Western blot analysis. No normal colorectal tissues possessed detectable levels of COX-2, p53 or HDM2. In contrast, 38.3% (28 cases), 54.8% (40 cases) and 8.2% (6 cases) of tumour tissues were found to express COX-2, p53 and HDM2, respectively. Interestingly, there was a significantly positive relationship between COX-2 overexpression and p53 accumulation and/or HDM2 overexpression (P=0.007). Higher COX-2 overexpression was observed in p53-accumulated or HDM2 overexpressed-tumours (22/43 cases, 51.1%) in comparison to tumours with no evidence of p53 and HDM2 alterations (6/30 cases, 20%). The results obtained from this study indicate that overexpression of COX-2 is frequently associated with p53 protein accumulation and HDM2 overexpression, therefore the COX-2 overexpression observed in colorectal cancer cells may be partly due to the dysfunction of p53. Although mutation of p53 has been previously reported to be associated with COX-2 induction, to our knowledge, this is the first study to show the relationship between HDM2 overexpression and COX-2 overexpression.
journal_name
Cancer Lettjournal_title
Cancer lettersauthors
Cressey R,Pimpa S,Tontrong W,Watananupong O,Leartprasertsuke Ndoi
10.1016/j.canlet.2005.03.023keywords:
subject
Has Abstractpub_date
2006-02-28 00:00:00pages
232-9issue
2eissn
0304-3835issn
1872-7980pii
S0304-3835(05)00271-5journal_volume
233pub_type
杂志文章相关文献
CANCER LETTERS文献大全abstract::We previously reported that prostaglandin E(2) contributes to colon carcinogenesis through its binding to the prostaglandin E receptor subtype EP(1) using a genetic approach in EP(1)-knockout mice and a pharmacological approach with the EP(1) selective antagonist, ONO-8711. In the present study, we examined the effect...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/s0304-3835(00)00440-7
更新日期:2000-08-01 00:00:00
abstract::Curcumin, a major component of the Curcuma species, is known to have antioxidant, anti-inflammatory properties and induce apoptosis of cancer cells, however, the precise molecular mechanisms of apoptosis in vitro are unclear. In this study, we showed that curcumin, a plant product containing the phenolic phytochemical...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/j.canlet.2008.06.031
更新日期:2008-12-08 00:00:00
abstract::Several studies have established a link between aberrant PI(3)K-Akt-mTOR- and Ras-Raf-MEK-Erk1/2 signaling and neuroendocrine tumor disease. In this study, we comparatively investigate the antitumor potential of novel small-molecule inhibitors targeting mTOR (RAD001), mTOR/PI(3)K (NVP-BEZ235) and Raf (Raf265) on human...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/j.canlet.2010.02.018
更新日期:2010-09-01 00:00:00
abstract::The present study was conducted to clarify the mechanism responsible for enhancement of the anti-melanoma activity of levodopa methylester by supplemental ascorbate in vivo. 5-Hydroxydopa, a known cytotoxic agent and the major metabolite formed from levodopa in the presence of ascorbate and mushroom tyrosinase in vitr...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/0304-3835(85)90154-5
更新日期:1985-11-01 00:00:00
abstract::Multiple therapeutic strategies have been developed to treat pancreatic cancer. However, the outcomes of these approaches are disappointing. Due to deeper understandings of the pivotal roles of the immune system in pancreatic cancer tumorigenesis and progression, novel therapeutic strategies based on immune cells and ...
journal_title:Cancer letters
pub_type: 杂志文章,评审
doi:10.1016/j.canlet.2018.03.040
更新日期:2018-07-01 00:00:00
abstract::The chemopreventive influence of phenethyl isothiocyanate (PEITC) during the post-initiation stage was investigated in the N-nitrosobis(2-oxopropyl)amine (BOP)-initiated hamster tumorigenesis model. A total of 120 female 5-week-old hamsters were divided into six groups. Animals in groups 1-3, each consisting of 30 ham...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/s0304-3835(99)00089-0
更新日期:1999-07-01 00:00:00
abstract::Metastasis remains a formidable problem in malignant tumors. In this study, MTT assay revealed that 4-methyl-3-nitro-benzoic acid (MNBA) had no effect on cell viability and did not interfere with cell cycle in any breast cancer cell lines tested. However, treatment with MNBA on breast cancer cells can inhibit EGF-indu...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/j.canlet.2011.02.028
更新日期:2011-06-01 00:00:00
abstract::Although Apc(Min/+) mice are widely used for an animal model of human familial adenomatous polyposis (FAP), a majority of intestinal polyps locate in the small intestine. We recently reported that numerous beta-catenin-accumulated crypts (BCAC), which are reliable precursor lesions for colonic adenocarcinoma, develop ...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/j.canlet.2005.07.033
更新日期:2006-07-28 00:00:00
abstract::To investigate whether particular patterns of food consumption are related to the occurrence of breast and colon cancer, two simultaneous case-control studies of French-Canadians with 616 cases (414 breast cancer, 202 colon cancer) and 429 population-based controls were carried out. Food consumption data were obtained...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/j.canlet.2004.11.034
更新日期:2005-06-01 00:00:00
abstract::Overexpression of ACTR/AIB1 is frequently found in different cancers with distant metastasis. To address its possible involvement in tumor metastasis, we performed invasion assays to examine the effect of ACTR alteration on the invasiveness of breast cancer cells (MDA-MB-231 or T-47D) and found that high levels of ACT...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/j.canlet.2007.11.013
更新日期:2008-03-08 00:00:00
abstract::Inadequate immunity that occurs in a tumor environment is in part due to the presence of M2-type tumor-associated macrophages (TAMs). TGF-β has a multi-functional role in tumor development including modulating the biological activity of both the tumor and TAMs. In this study, using an in vitro TAM/tumor cell co-cultur...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/j.canlet.2013.01.001
更新日期:2013-05-01 00:00:00
abstract::The pulmonary tumorigenicity of dimethylarsinic acid (DMAA), a main metabolite of inorganic arsenics, was examined in A/J mice fed with drinking water containing DMAA for 25 and 50 weeks. Mice fed with 400 ppm DMAA for 50 weeks produced more pulmonary tumors than untreated mice (mean number per animal 1.36 versus 0.50...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/s0304-3835(97)00484-9
更新日期:1998-03-13 00:00:00
abstract::In order to determine the effects of intermittent hormonal manipulation on the promotion stage of rat prostate carcinogenesis, testosterone and/or estrogen were administered to F344 rats for 40 weeks after 20-weeks treatment with the prostate carcinogen, 3,2'-dimethyl-4-aminobiphenyl. For this purpose testosterone pro...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/s0304-3835(97)00390-x
更新日期:1998-01-09 00:00:00
abstract::Head and neck squamous cell carcinoma (HNSCC) is one of the most lethal cancers mainly due to the high rate of metastasis. Here, we find that the expression level of CD100 in HNSCC is positively correlated with the T category, pathological grade and lymph node metastasis of the tumor. The level of soluble CD100 (sCD10...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/j.canlet.2019.04.013
更新日期:2019-07-28 00:00:00
abstract::In the present study, the question of whether the ubiquitous environmental pollutant, 1-nitropyrene (1-NP), can induce gamma-glutamyltranspeptidase (GGT)-positive foci, an early lesion occurring during hepatocarcinogenesis, when given orally to F344 rats was examined. Significant induction of GGT-positive foci was obs...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/0304-3835(89)90031-1
更新日期:1989-04-01 00:00:00
abstract::To define the critical region of liver-specific tumor suppressor genes in human hepatocellular carcinoma (HCC), we analyzed 30 cases of hepatocellular carcinoma using nine 4q and six 16q microsatellite polymorphic DNA markers. We observed one major common deleted region which was flanked by D4S175-D4S1625 and there ma...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/s0304-3835(97)00276-0
更新日期:1998-01-16 00:00:00
abstract::The desensitization mechanism of the EGF receptor (EGFR) is important for the regulation of cancer cells. Although the phosphorylation of EGFR at Tyr1045 and Ser1046/1047 (Ser1046/7) reportedly accounts for such desensitization, the precise mechanism still remains unknown. Therefore, the present study investigated the...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/j.canlet.2008.11.034
更新日期:2009-05-08 00:00:00
abstract::This study investigated the role of miR-206 in estrogen receptor-α (ERα)-positive endometrial endometrioid adenocarcinoma (EEC). We profiled miR-206 expression in 30 EEC clinical samples using qRT-PCR, and explored its relationship with ERα and clinical parameters. A luciferase reporter assay assessed the ERα targetin...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/j.canlet.2011.09.014
更新日期:2012-01-01 00:00:00
abstract::Okadaic acid, a potent tumor promoter and an inhibitor of protein phosphatase 1 and 2A, has also been characterized as an angiogenic inducer in the chorioallantoic membrane of the chick embryo. To elucidate the roles of okadaic acid on angiogenic processes, we conducted in vitro angiogenesis assays. In this study, we ...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/j.canlet.2008.10.034
更新日期:2009-04-08 00:00:00
abstract::Experiments were conducted to determine whether gamma-ray-induced genetic damage in parental rats can lead to the development of cancer in their offspring rats using glutathione S-transferase-positive (GST-P+) hepatic foci with or without the addition of diethylnitrosamine (DEN), a carcinogen. A single 1 Gy whole-body...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/s0304-3835(98)00155-4
更新日期:1998-10-23 00:00:00
abstract::The relationship between the degree of lymphocytic infiltration into the tumor and the prognosis has not been completely evaluated between Epstein-Barr virus (EBV)-positive and -negative gastric carcinoma (GC). Although the average numbers and the grades of the infiltrating CD8+T cells, natural killer cells, dendritic...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/s0304-3835(03)00410-5
更新日期:2003-10-08 00:00:00
abstract::The susceptibility of analbuminemic rats, a mutant strain of Sprague-Dawley rats, to bladder carcinogens was examined by testing the agglutinability of isolated bladder epithelial cells by Concanavalin A (Con A). One-week treatment with 0.001% N-butyl-N-(4-hydroxybutyl)nitrosamine (BHBN) in the drinking water or 0.01%...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/0304-3835(83)90128-3
更新日期:1983-05-01 00:00:00
abstract::KMT2A rearranged (KMT2Ar) acute lymphoblastic leukaemia (ALL) is a high-risk genomic subtype, with long-term survival rates of less than 60% across all age groups. These cases present a complex clinical challenge, with a high incidence in infants, high-risk clinical features and propensity for aggressive relapse. KMT2...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/j.canlet.2019.11.005
更新日期:2020-01-28 00:00:00
abstract::Tumor-associated macrophages (TAMs) are important immunocytes associated with cancer metastasis. However, whether TAMs play a dominant role in mediating CXCL12/CXCR4-induced liver metastasis of colorectal cancer (CRC) remains unexplored. Herein, we found that CD206+ TAMs, which infiltrated at the invasive front, were ...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/j.canlet.2020.01.005
更新日期:2020-04-01 00:00:00
abstract::Gastrin, cholecystokinin2 receptor (CCK2R), and cyclooxygenase-2 (COX-2) have been implicated in the carcinogenesis and progression of gastric cancer. Our study demonstrated that antagonist or siRNA against CCK2R blocked amidated gastrin (G17)-induced activation of STAT3 and Akt in gastric cancer cell lines. G17-incre...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/j.canlet.2012.12.030
更新日期:2013-05-10 00:00:00
abstract::Human RecQ helicases that share homology with E. coli RecQ helicase play critical roles in diverse biological activities such as DNA replication, transcription, recombination and repair. Mutations in three of the five human RecQ helicases (RecQ1, WRN, BLM, RecQL4 and RecQ5) result in autosomal recessive syndromes char...
journal_title:Cancer letters
pub_type: 杂志文章,评审
doi:10.1016/j.canlet.2017.10.021
更新日期:2018-01-28 00:00:00
abstract::Caveolins, essential scaffold proteins of caveolae, have emerged as versatile molecules that can influence numerous signaling pathways and disease processes. This brief review is focused on the role of caveolins in the physiology and pathology of musculoskeletal system and will discuss the key features of caveolins as...
journal_title:Cancer letters
pub_type: 杂志文章,评审
doi:10.1016/j.canlet.2009.02.016
更新日期:2009-11-01 00:00:00
abstract::Non-small cell lung cancer (NSCLC) patients with activating EGFR mutations are often successfully treated with EGFR tyrosine kinase inhibitor (TKI) such as erlotinib; however, treatment resistance inevitably occurs. Given tumor metabolism of glucose and therapeutic response are intimately linked, we explored the metab...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/j.canlet.2018.07.025
更新日期:2018-10-10 00:00:00
abstract::We studied the effect of 13-cis-retinoic acid (13-cRA) alone and in combination with interferons (IFNs) and tamoxifen (TAM) in two established human breast cancer cell lines: the estrogen-sensitive CG-5 and the estrogen-insensitive MDA-MB-453 cells. 13-cRA (10(-9)-10(-5) M) significantly reduced the growth of both cel...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/0304-3835(95)04099-4
更新日期:1996-02-27 00:00:00
abstract::In this study, we aimed to establish a platinum-based chemotherapy response and toxicity prediction model in advanced non-small cell lung cancer (NSCLC) patients. 416 single nucleotide polymorphisms (SNPs) in 185 genes were genotyped, and their association with drug response and toxicity were estimated using logistic ...
journal_title:Cancer letters
pub_type: 杂志文章
doi:10.1016/j.canlet.2016.04.029
更新日期:2016-07-10 00:00:00