صفحه 1 از جانب 108 نتایج
Polychlorinated biphenyls (PCBs) are widespread, chemically-stable environmental contaminants; some congeners are commonly found in human adipose tissue and breast milk. We investigated the effects of a single dose of one PCB mixture (Aroclor 1254) on tumors initiated by N-nitrosodimethylamine
Experiments on 892 non-inbred male rats studied the development of renal tumors in the animals intermittently administered two substances different in the mechanism of carcinogenic action. Renal pre-injection of methylcholantherene (MC) in a small dose insufficient to induce renal tumors in the
The aim of the study was to determine the tumorigenic potential of two cell lines established from N-nitrosodimethylamine induced rat hepatocarcinoma (HeDe) and mesenchymal renal tumors (NeDe). The basis of the distinction is that human cancers are known to overexpress facilitative GLUT transporters
It is our working hypothesis that the high rate of the liver and gastric cancers in North and Northeast Thailand is associated with increased daily dietary intake of nitrate, nitrite, and nitrosodimethylamine (NDMA). Samples of fresh and preserved Thai foods were systematically collected and
Evidence from animal studies indicates that various N-nitroso compounds are carcinogenic. We investigated whether consumption of nitrosodimethylamine (NDMA) and foods and beverages containing NDMA are carcinogenic for the lung. In a hospital-based case-control study in Uruguay, dietary intake of
BACKGROUND
Mutations in the von Hippel-Lindau (VHL) gene are common in human clear cell kidney cancers. Carcinogens in cigarette smoke, especially nitrosamines, are known to induce kidney tumors of a variety of histologic types in rodents--but with no evidence of VHL mutations; however, none of
We have previously shown a positive tumor-promoting effect of a single dose of Aroclor 1254 on lung and liver tumors initiated neonatally in the mouse by N-nitrosodimethylamine (NDMA). In this study, we have confirmed and extended this observation with NDMA and the tobacco-specific nitrosamine,
Evidence from animal studies indicates that various N-nitroso compounds are carcinogenic. We investigated whether consumption of foods and beverages containing nitrosodimethylamine, nitrites, and nitrates affected the risk of laryngeal, esophageal, and oral cancer. In a population-based case-control
A Weibull analysis is presented of the dose and time relationships for the effects on 4080 inbred rats of chronic ingestion in the drinking water of 16 different doses of N-nitrosodimethylamine (NDMA) or N-nitrosodiethylamine (NDEA). The sites chiefly affected were the liver (by both agents) and the
The relationships between DNA methylation and repair induced by the tobacco-specific nitrosamine 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) to the activation of proto-oncogenes and the induction of pulmonary neoplasia by this carcinogen is described. The formation of the O6-methylguanine
Amidopyrine administered in combination with sodium nitrite in the long-term experiment produces the toxic damage of the liver and tumors in rats in connection with endogenic synthesis of carcinogenic nitrosodimethylamine. The inclusion into the animal diet of the polyphenolic complex from Plantago
BACKGROUND
Previous epidemiologic studies found inconsistent results for the association between red meat intake, nitrosamines [NDMA: N-nitrosodimethylamine, and ENOC (endogenous nitroso compounds)], and the risk of bladder cancer. We investigated the association between red meat consumption,
Oral cotreatment of mice with ethanol results in increased tumors in extrahepatic organs caused by some nitrosamines. This action, attributed in part to inhibition of hepatic first-pass carcinogen metabolism by ethanol, has possible relevance to the enhancing effect of alcoholic beverage consumption
Liver fibrosis is a chronic liver disease caused by viral infection and/or metabolic, genetic and cholestatic disorders. The inhibition of hepatic stellate cell (HSC) activation and the selective apoptosis of activated HSCs can be a good strategy to treat liver fibrosis. The activated HSCs are known
A high frequency of point mutations at codon 12 of the Ki-ras gene has previously been reported for rat kidney mesenchymal tumors induced by methylating N-nitroso compounds. In this study, we analyzed renal tumors with divergent histogenesis, i.e., mesenchymal tumors (sarcomas), cortical epithelial