نتایج جستجو برای: antimetabolite agents
تعداد نتایج: 361048 فیلتر نتایج به سال:
S INCE THE INTRODUCTION of the folic acid antagonists into clinical medicine’ several other agents with an effect on acute leukemia have been employed: purine analogs,2 corticotropin and corticosteroids.3 Despite the number of compounds available, all patients do not derive benefit from them; when improvement does occur it is usually short lasting. Until other more effective antileukemic treatm...
Historically, the most useful medicinal agents have been obtained by empirical screening or by the chemical modification of compounds of known activity in the hope of making them more effective. To these approaches a new one was added in recent years-antimetabolites. An antimetabolite may be defined as a compound bearing structural resemblance to a metabolite and capable of being attached to th...
Checkpoint kinase 1 (CHK1) is an essential serine/threonine kinase that responds to DNA damage and stalled DNA replication. CHK1 is essential for maintenance of replication fork viability during exposure to DNA antimetabolites. In human tumor cell lines, ablation of CHK1 function during antimetabolite exposure led to accumulation of double-strand DNA breaks and cell death. Here, we extend these...
Polyphenols have been previously shown to sensitize leukemia cell lines to topoisomerase inhibitors. Here, we assess the effects of five polyphenols when used alone and in combination with antimetabolites: methotrexate, 6-mercaptopurine and 5-fluorouracil; in lymphoid and myeloid leukemia cells lines, and non-tumor control cells. The effects of combined treatments were investigated on ATP and g...
The management of colorectal cancer relies heavily on the combination of the pyrimidine analog antimetabolite 5-fluorouracil with the platinum-based drug oxaliplatin or the topoisomerase inhibitor irinotecan. Optimization of dosing and scheduling of these agents to improve response and survival continues to evolve. Meanwhile, the rational targeting of molecular signaling pathways that are invol...
A simple bacteriological technique involving inhibition zone production on a lawn of Escherichia coli was developed to detect antimetabolite toxin production by phytopathogenic species of Pseudomonas. It was established that the mechanism of E. coli inhibition paralleled that of phytotoxin-induced chlorosis of plant tissue. Derivatives of Pseudomonas tabaci and Pseudomonas phaseolicola which di...
New agent development, mechanistic understanding, and combinatorial partnerships with known and novel modalities continue to be important in the study of pancreatic cancer and its improved treatment. In this study, known antimetabolite drugs such as gemcitabine (ribonucleotide reductase inhibitor) and 5-fluorouracil (thymidylate synthase inhibitor) were compared with novel members of these two ...
Pseudomonas syringae is pathogenic in a wide variety of plants, causing diseases with economic impacts. Pseudomonas syringae pathovars produce several toxins that can function as virulence factors and contribute to disease symptoms. These virulence factors include antimetabolite toxins, such as tabtoxin, phaseolotoxin and mangotoxin, which target enzymes in the pathways of amino acid metabolism...
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