نتایج جستجو برای: intestinal polyposis
تعداد نتایج: 141322 فیلتر نتایج به سال:
BACKGROUND Molecular studies suggest inhibition of colorectal mucosal polyamines (PAs) may be a promising approach to prevent colorectal cancer (CRC). Inhibition of ornithine decarboxylase (ODC) using low-dose eflornithine (DFMO, CPP-1X), combined with maximal PA export using low-dose sulindac, results in greatly reduced levels of normal mucosal PAs. In a clinical trial, this combination (compa...
The adenomatous polyposis coli (APC) gene, whose mutations are responsible for familial adenomatous polyposis, is a major negative controller of the Wnt/beta-catenin pathway. To investigate the dose-dependent effects of APC protein in suppressing intestinal tumorigenesis, we constructed mutant mice carrying hypomorphic Apc alleles Apc(neoR) and Apc(neoF) whose expression levels were reduced to ...
Several lines of evidence strongly link prostaglandins (PGs) and leu kotrienes (LTs) to cancer of the intestine. Several studies have reported a 40—50%reduction in mortality from colorectal cancer in individuals who routinely consume nonsteroidal anti-inflammatory drugs, possibly by in hlbiting cyclooxygenase activity. However, the role of eicosanoids in this process is still unclear. The het...
Peutz-Jeghers Syndrome (PJS) is a rare autosomal dominant disorder equally affecting males and females with an incidence of 1/25,000 – 1/300,000 births. It characterised by the development hamartomatous polyps digestive tract, lifetime risk colorectal cancer other gastrointestinal malignancies, as well non-gastrointestinal cancers such breast ovarian cancers. Intestinal polyposis very common in...
The multiple intestinal neoplasia (Min) mice have a mutation in the murine adenomatous polyposis coli (Apc) gene rendering them highly susceptible to spontaneous intestinal adenoma formation, similar to the familial adenomatous polyposis (FAP) syndrome in humans. We studied whether the most abundant mutagenic heterocyclic amine isolated from cooked food, 2-amino-1-methyl-6-phenylimidazo[4,5-b]p...
Contributions of null and hypomorphic alleles of Apc in mice produce both developmental and pathophysiological phenotypes. To ascribe the resulting genotype-to-phenotype relationship unambiguously to the Wnt/beta-catenin pathway, we challenged the allele combinations by genetically restricting intracellular beta-catenin expression in the corresponding compound mutant mice. Subsequent evaluation...
We have tested the hypothesis that entenc bacteria are necessary for formation of intestinal adenomas in C57BU6-Apc@'@I+mouse. Germ-free mice developed 2-fold fewer adenomas than conventional controls in the medial small intestine (7.3 versus 14.9; P < 0.003), but there were no significant differences in the rest of the intestinal tract. We conclude that microbial status does not strongly alter...
MUTYH is a DNA glycosylase that excises adenine paired with 8-oxoguanine to prevent mutagenesis in mammals. Biallelic germline mutations of MUTYH have been found in patients predisposed to a recessive form of familial adenomatous polyposis (MAP: MUTYH-associated polyposis). We previously reported that Mutyh-deficient mice showed a high susceptibility to spontaneous and oxidative stress-induced ...
Adenomatous polyposis coli (APC) is best known for its crucial role in colorectal cancer suppression. Rodent models with various Apc mutations have enabled experimental validation of different Apc functions in tumors and normal tissues. Since the development of the first mouse model with a germline Apc mutation in the early 1990s, 20 other Apc mouse and rat models have been generated. This arti...
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