الصفحة 1 من عند 93 النتائج
The mechanism of polyamine uptake in mammalian cells is still poorly understood. The role of inorganic cations in polyamine transport was investigated in ZR-75-1 human breast cancer cells. Although strongly temperature dependent, neither putrescine nor spermidine uptake was mediated by a Na+
The properties and regulation of the mammalian polyamine transport system are still poorly understood. In estrogen-responsive ZR-75-1 human breast cancer cells, which display low polyamine biosynthetic activity, putrescine and spermidine were internalized with high affinity (Km = 3.7 and 0.5 microM,
The diamine putrescine and polyamines, spermidine (triamine) and spermine (tetraamine) are small organic polycations that play an indispensable role in key cellular processes such as the regulation of growth, differentiation, and macromolecular functions. Elevated levels of polyamines (PAs) have
Estradiol (E2) and the naturally occurring polyamines (putrescine, spermidine, and spermine) play important roles in breast cancer cell growth and differentiation. We examined the effects of E2 and spermine on the phosphorylation and DNA binding of activating transcription factor-2 (ATF-2) in MCF-7
Inhibition of polyamine biosynthesis with alpha-difluoromethylornithine (DFMO) has been shown to inhibit proliferation of breast cancer cells although its mechanism of action has not been fully elucidated. To address this issue, we tested the effects of DFMO on cell cycle variables of MDA-MB-435
Spermidine/spermine N(1)-acetyltransferase (SSAT) regulates polyamine catabolism. Thioredoxin-1 (Trx-1) is a redox protein that is overexpressed in human cancer leading to increased cell proliferation, decreased apoptosis, and decreased patient survival. We report that SSAT mRNA expression is
Polyamines are considered to be important intracellular molecules for the proliferation of the cancer cells. In this study, effects of methylglyoxal bis(cyclopentylamidinohydrazone) (MGBCP), a potent inhibitor of the polyamine biosynthetic pathway, on the growth and cell cycle of T-47D human breast
OBJECTIVE
The polyamines putrescine, spermidine, and spermine, play an important role in cell proliferation, differentiation, and transformation. The aim of this study is to correlate the polyamines with apoptosis and clinico-pathologic events in Egyptian breast cancer patients.
METHODS
PUT, SPD,
Polyamines may be involved in hormone-dependent breast cancer cell proliferation. The antiestrogen 4-hydroxy-tamoxifen and the polyamine synthesis inhibitor alpha-difluoromethylornithine (DFMO) inhibited MCF-7 growth, and this effect was additive. Transforming growth factor beta (TGF-beta) levels
The aim of the work was the investigation of the influence of polyamines on formation of nuclear transcription factor kappa B (NF-kappaB) complex with specific DNA-sequences nuclear response elements (NRE), and the study of content of p50 and p65 (NF-kappaB subunits) in breast tumor cells under
Ornithine decarboxylase (ODC) is an enzyme intimately related to cell growth regulation. The metabolic products of ODC, the polyamines, are known to play a vital role in the structure and function of biological macromolecules including nucleic acids and proteins. The activity of ODC is stimulated by
Excessive wound exudates are troublesome symptoms of malignant fungating wounds. In particular, such exudates may cause periwound moisture-associated dermatitis (MAD). In this study, we focused on factors that contribute to skin irritation by exudates in breast cancer patients with malignant
The diagnostic significance of three polyamines (putrescine, spermidine and spermine), of carcinoembryonic antigen and of phosphoglucose isomerase have been compared in sera of patients with breast cancer or benign breast disease and normal age matched controls. The results of the study indicate
The authors measured estrogen receptors, and polyamine (putrescine, spermidine and spermine) in breast tumors from patients (n = 23) who had received tamoxifen for a few days (5-10) before surgery. Women undergoing mastectomy without any preoperatory treatment were selected as the control group (n =