Abstract:
:Nitrosamine-induced hepatocarcinogenesis has been used to investigate the regulation and expression of different drug-metabolizing enzymes in preneoplastic and neoplastic lesions in the female Wistar rat. The enzymes investigated were two phenobarbital-inducible cytochrome P-450 (cyt. P-450) isoenzymes (PB1 and PB2, mol. wt. 52 000 and 53 500, respectively), two 3-methylcholanthrene-inducible forms (MC1 and MC2, mol. wt. 54 500 and 57 000, respectively), NADPH-cytochrome P-450 reductase, the cytosolic glutathione transferases (GSTs) B and C and the microsomal epoxide hydrolase with broad substrate specificity (mEHb). Carcinogen-induced lesions were identified by use of the known markers of hepatocarcinogenesis adenosinetriphosphatase and gamma-glutamyl transpeptidase. While the GSTs and mEHb were increased in all preneoplastic and neoplastic lesions, the levels of the individual cyt. P-450 isoenzymes were characteristically different from each other. In many of the early ATPase deficient islets PB1 was elevated, whereas the content of the other cyt. P-450 forms and NADPH-cytochrome P-450 reductase was either unchanged or slightly lowered. At later stages of hepatocarcinogenesis PB1 returned to the levels of the surrounding tissue, while the other cyt. P-450 isoenzymes were decreased, the most prominent reduction being found in MC1. In neoplastic nodules all the cyt. P-450s and NADPH-cyt. P-450 reductase were diminished, some of them dramatically. These findings indicate that in spite of a common response of groups of P-450s to inducing agents, individual P-450 isoenzymes are also regulated separately. Moreover, the constant elevation of mEHb and GSTs in all lesions investigated in this study demonstrates that these enzymes, which are largely involved in deactivation, are regulated in a different fashion from the predominantly carcinogen-activating monooxygenases. The observed differences in enzyme pattern may provide a useful method for subdividing and categorizing preneoplastic and neoplastic lesions.
journal_name
Carcinogenesisjournal_title
Carcinogenesisauthors
Buchmann A,Kuhlmann W,Schwarz M,Kunz W,Wolf CR,Moll E,Friedberg T,Oesch Fdoi
10.1093/carcin/6.4.513subject
Has Abstractpub_date
1985-04-01 00:00:00pages
513-21issue
4eissn
0143-3334issn
1460-2180journal_volume
6pub_type
杂志文章相关文献
CARCINOGENESIS文献大全abstract::The measurement of oxidative damage to cellular DNA is a challenging analytical problem requiring highly sensitive and specific methods. In addition, artefactual DNA oxidation during its extraction and subsequent work-up may give rise to overestimated levels of oxidized DNA bases. In the present study, we have used (1...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/23.11.1911
更新日期:2002-11-01 00:00:00
abstract::The effects of exposure to benzo[a]pyrene (BAP) and formaldehyde (HCHO), alone and combined, on the induction of carcinogenesis in rat tracheal implants was determined as the number of growth-altered cell populations (tumor-initiation sites, TIS) per trachea. While exposure twice-weekly for 4.5 months to 0.2% HCHO sol...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/8.12.1951
更新日期:1987-12-01 00:00:00
abstract::Desmosomes are intercellular junctions that confer strong cell-cell adhesion. Altered expression of desmocollin 3 (DSC3), a member of the desmosomal cadherin family, was found in various cancers; however, its functional involvement in carcinogenesis has not yet been elucidated. Expression/localization of DSC3 was anal...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/bgs273
更新日期:2012-12-01 00:00:00
abstract::Results of previous serologic studies on the association of human papillomavirus (HPV) with esophageal squamous cell carcinoma (ESCC) have been inconsistent. From 2007 to 2010, the authors collected blood samples and relevant demographic data from 1435 patients with ESCC and 2071 age- and sex-matched normal controls f...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/bgt483
更新日期:2014-04-01 00:00:00
abstract::Yeasts were isolated from 12 cases of oral precancerous lesions (leukoplakia and erythroleukoplakia) by sampling the lesion as well as normal mucosa of each patient, yielding 21 strains of Candida albicans belonging to 15 biotypes, two strains of C. tropicalis, one strain of C. parapsilosis and two strains of Torulops...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/8.10.1543
更新日期:1987-10-01 00:00:00
abstract::The urinary excretion of dimethylnitrosamine (DMN) was studied in male Sprague-Dawley rats. Animals were given DMN (3, 5, 10, 20, 30 and 50 mg/kg body weight, i.p.) or [3H]DMN (0.1, 1 and 3 mg; 8.7, 1.5 and 0.28 mCi/kg body weight, respectively, i.p.) diluted with sterile 0.9% NaCl. Urine was collected for 24 h after ...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/2.7.609
更新日期:1981-01-01 00:00:00
abstract::Non-steroidal anti-inflammatory drugs prevent colorectal cancer by inhibiting cyclooxygenase (COX) enzymes that synthesize tumor-promoting prostaglandins. 15-hydroxyprostaglandin dehydrogenase (15-PGDH) is a tumor suppressor that degrades tumor-promoting prostaglandins. Murine knockout of 15-PGDH increases susceptibil...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/bgu241
更新日期:2015-02-01 00:00:00
abstract::Previous research suggests that far upstream element-binding protein 1 (FUBP1) plays an important role in various tumors including epatocellular carcinoma (HCC). However, the role of FUBP1 in liver cancer remains controversial, and the regulatory pathway by FUBP1 awaits to be determined. This study aims to identify th...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/bgz171
更新日期:2020-07-14 00:00:00
abstract::Telomere dynamics are a critical component of both aging and cancer. Telomeres progressively shorten in almost all dividing cells and most human cells do not express or maintain sufficient telomerase activity to fully maintain telomeres. There is accumulating evidence that when only a few telomeres are short, they for...
journal_title:Carcinogenesis
pub_type: 杂志文章,评审
doi:10.1093/carcin/bgh296
更新日期:2005-05-01 00:00:00
abstract::Phosphorylation of proteins on serine or threonine residues that immediately precede proline (pSer/Thr-Pro) is specifically catalyzed by the peptidyl-prolyl cis-trans isomerase Pin1 and is a central signaling mechanism in cell proliferation and transformation. Although Pin1 is frequently overexpressed in hepatocellula...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/bgp027
更新日期:2009-04-01 00:00:00
abstract::Intratumor heterogeneity (ITH) plays an important role in tumor development, metastases, recurrence and has impact on clinical diagnosis, therapeutic responses. In this study, we used mutant-allele tumor heterogeneity (MATH) through whole-exome sequencing data to evaluate ITH in early stage diffuse large B-cell lympho...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/bgz068
更新日期:2019-11-25 00:00:00
abstract::Genetic variants in multiple cellular pathways have been associated with an altered risk of oesophageal cancer. In this study, eight genes previously associated with an altered risk of oesophageal squamous cell carcinoma (OSCC) in European or Asian populations were investigated in two South African populations. We gen...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/bgr211
更新日期:2011-12-01 00:00:00
abstract::Multidrug resistance 2 (Mdr2), also called adenosine triphosphate-binding cassette B4 (ABCB4), is the transporter of phosphatidylcholine (PC) at the canalicular membrane of mouse hepatocytes, which plays an essential role for bile formation. Mutations in human homologue MDR3 are associated with several liver diseases....
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/bgv156
更新日期:2016-01-01 00:00:00
abstract::The mutagenicities of 2-aminodipyrido [1,2-a:3',2'-d] imidazole (Glu-P-2, a mutagen obtained from pyrolysate of glutamic acid) and six methyl substituted derivatives of Glu-P-2 were tested with Salmonella typhimurium TA98 and TA100 with S-9 mix. Glu-P-1 (6-Me-Glu-P-2) was the strongest mutagen to TA98 and TA100. 3-Me-...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/1.11.889
更新日期:1980-01-01 00:00:00
abstract::Male outbred Sprague-Dawley rats were fed a choline-deficient diet containing 0.10% DL-ethionine for up to 30 weeks. Liver slices from rats killed 4, 6, 10, 14, 22 and 30 weeks after starting the treatment were histochemically analyzed for the following parameters: basophilia, expression of cytokeratin 19 (which in th...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/12.2.225
更新日期:1991-02-01 00:00:00
abstract::Previous studies have shown that decorin expression is significantly reduced in colorectal cancer tissues and cancer cells, and genetic deletion of the decorin gene is sufficient to cause intestinal tumor formation in mice, resulting from a downregulation of p21, p27(kip1) and E-cadherin and an upregulation of β-caten...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/bgr293
更新日期:2012-02-01 00:00:00
abstract::A dose-dependent and transiently elevated expression of a cytoplasmic 32 kDa protein was observed in Swiss albino 3T3 fibroblasts exposed to mainstream cigarette smoke (CS) trapped in phosphate-buffered saline solutions (smoke-bubbled PBS). The protein was identified as heme oxygenase (HO) (heme, hydrogen donor:oxygen...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/15.1.67
更新日期:1994-01-01 00:00:00
abstract::Low vitamin E and selenium (Ve/Se) nutritional status is known to be associated with increased risk of esophageal squamous cell carcinoma (ESCC). A previous human intervention trial demonstrated that Ve/Se supplementation decreased the occurrence of esophageal cancer death among younger participants but not among olde...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/bgq279
更新日期:2011-03-01 00:00:00
abstract::The fluorescent 12-O-tetradecanoylphorbol-13-acetate (TPA) analogue dansyl-TPA allowed the distribution of fluorescent molecules to be visualized in living mouse fibroblasts. The entry of dansyl-TPA into cells occurred within millisecond time scale and was found largely energy independent. Dansyl-TPA was shown to stai...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/6.3.433
更新日期:1985-03-01 00:00:00
abstract::We have shown previously that (NOHA) an intermediate in the nitric oxide (NO) synthetic pathway and an inhibitor of arginase significantly reduced intracellular polyamines, activated caspase-3 and induced apoptosis in the human breast cancer cell line MDA-MB-468. These actions of NOHA were abolished in the presence of...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/22.11.1863
更新日期:2001-11-01 00:00:00
abstract::Folate and vitamin D have been shown to be influenced by ultraviolet (UV) radiation. UVA radiation can break down plasma folate, whereas vitamin D can be synthesized in UVB-exposed skin. Folate metabolism is involved in DNA synthesis and repair, and vitamin D processes anti-proliferative effects. The functions of both...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/bgl156
更新日期:2007-02-01 00:00:00
abstract::Phosphoinositide-specific phospholipase Cgamma (PLCgamma) is a key regulatory enzyme that binds to the phosphoryl-tyrosine residues in the cytoplasmic domain of certain activated receptors and catalyses the hydrolysis of phosphatidylinositol 4,5-bisphosphate [PtdIns(4,5)P2] forming IP3 and diacylglycerol (DAG) in resp...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/19.1.177
更新日期:1998-01-01 00:00:00
abstract::Ataxia-telangiectasia (A-T), which is due to mutations in the ATM gene, is a rare autosomal recessive genomic instability syndrome characterized by radiosensitivity and predisposition to cancer. Epidemiological studies have suggested that relatives of A-T patients (A-T carriers) have increased risks of developing brea...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/bgi302
更新日期:2006-04-01 00:00:00
abstract::The effects of hyperoxia on lung tumor development were examined in mice and rats. In mice, exposure to 70% O2 prevented the development of urethan- or 3-methylcholanthrene-induced lung tumors. Dietary antioxidants [butylated hydroxytoluene (BHT) and butylated hydroxyanisole (BHA)] were unable to prevent the inhibitio...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/7.9.1581
更新日期:1986-09-01 00:00:00
abstract::Tobacco smoking and occupational exposure are major risk factors of bladder cancer via exposure to polycyclic aromatic hydrocarbons (PAHs) and aromatic amines, which lead to oxidative stress and DNA damage. Several enzymes, which play key roles in oxidative stress are polymorphic in humans. Myeloperoxidase (MPO) produ...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/bgh080
更新日期:2004-06-01 00:00:00
abstract::The most potent carcinogen of the cyclopenta[a]phenanthrene series, 15, 16-dihydro-11-methylcyclopenta[a]phenanthren-17-one and its non-carcinogenic, unmethylated parent compound, were compared for their abilities to induce micronuclei in epidermal keratinocytes after application onto the dorsal skin of Skh/HR-1 hairl...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/13.3.329
更新日期:1992-03-01 00:00:00
abstract::Although the human O6-alkylguanine-DNA alkyltransferase (AGT) is very sensitive to inactivation by O6-benzylguanine (BG) or 2,4-diamino-6-benzyloxy-5-nitrosopyrimidine (5-nitroso-BP), the equivalent protein formed by the carboxyl terminal domain of the product of the Escherichia coli ada gene (Ada-C) is unaffected by ...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/16.8.1687
更新日期:1995-08-01 00:00:00
abstract::2-Amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) is a mammary gland carcinogen present in the human diet. Herein, the expression of estrogen receptor alpha (ERalpha), estrogen receptor beta (ER beta) and progesterone receptor (PR) was examined in mammary gland carcinomas induced by PhIP in female Sprague-Dawley ...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/bgi013
更新日期:2005-04-01 00:00:00
abstract::Two mutagenic compounds have been isolated and purified from commercial beef extract. These two compounds have chemical, chromatographic, spectroscopic and biological behavior indistinguishable from those of the two known mutagens 2-amino-3-methyl-imidazo-[4,5-f]-quinoline and 2-amino-3,8-dimethyl-imidazo-[4,5-f]-quin...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/4.7.863
更新日期:1983-01-01 00:00:00
abstract::The oxidative stress induced in vivo by benzoyl peroxide (BzPo) or 12-O-tetradecanoylphorbol-13-acetate (TPA) was evaluated in terms of chemiluminescence (CL) emitted by SENCAR mouse skin, a non-invasive method that allows an estimation of overall oxidative stress. The ability of a biomimetic superoxide dismutase, cop...
journal_title:Carcinogenesis
pub_type: 杂志文章
doi:10.1093/carcin/12.11.2047
更新日期:1991-11-01 00:00:00