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15 hasil
Anticancer photodynamic and non-photodynamic effects of pterin derivatives on a pancreatic cancer cell line.
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To evaluate the feasibility of two kinds of pterin derivatives, 2-(N,N-dimethylaminomethyleneamino)-6-formyl-3-pivaloylpteridin-4-one (DFP) and 2-(N,N-dimethylaminomethyleneamino)-3-pivaloylpteridin-4-one (DP), as anticancer drugs, their photodynamic and non-photodynamic effects on pancreatic cancer
Photodynamic effects of a novel pterin derivative on a pancreatic cancer cell line.
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6-Formylpterin (6FP) has the potential to produce singlet oxygen (1O2) under UV-A radiation. In order to apply this potential to anti-cancer photodynamic therapy (PDT), we prepared a novel variant of 6FP, 2-(N,N-dimethylaminomethyleneamino)-6-formyl-3-pivaloylpteridine-4-one (6FP-tBu-DMF), and
Cytokine and IDO metabolite changes effected by calcium pterin during inhibition of MDA-MB-231 xenograph tumors in nude mice.
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In vivo studies of the effectiveness of various forms of calcium pterin reveal significant antitumor activity associated with (1:4, mol/mol) calcium pterin (CaPterin), (1:2, mol/mol) calcium pterin, dipterinyl calcium pentahydrate (DCP), as well as unexpectedly for a calcium chloride dihydrate
The radical scavenger edaravone (3-methyl-1-phenyl-2-pyrazolin-5-one) reacts with a pterin derivative and produces a cytotoxic substance that induces intracellular reactive oxygen species generation and cell death.
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Cytotoxic effects of the combined use of edaravone (3-methyl-1-phenyl-2-pyrazolin-5-one), a radical scavenger and an approved medicine for acute brain infarction in Japan, with a pterin derivative, were examined in vitro. When pancreatic cancer cell line Panc-1 cells were incubated with 50 to 400
Plasma cytokine concentration changes induced by the antitumor agents dipterinyl calcium pentahydrate (DCP) and related calcium pterins.
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Analysis of plasma cytokine concentration changes determined that oral dosing with the antitumor agent (1:4 mol:mol) calcium pterin (CaPterin) increased plasma IL-10, decreased plasma IL-6, and decreased plasma IFN-gamma concentrations in nude mice with MDA-MB-231 xenograph tumors [Moheno, P.,
Calcium pterin as an antitumor agent.
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A series of in vivo studies are reported that provide evidence for an immunologically mediated mechanism for the antitumor response from a calcium pterin (CaPterin) suspension. Strong antitumor efficacy was demonstrated in fully immunocompetent female C3H/HeN-MTV+ mice (retired breeders) presenting
Calcium-pterin suppresses mitogen-induced tryptophan degradation and neopterin production in peripheral blood mononuclear cells.
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Antitumor activity of a calcium-pterin suspension has been described in vitro and in animal model systems. Recent studies provide some evidence that this effect involves immune-mediated mechanisms. We investigated the influence of calcium-pterin on freshly isolated human peripheral blood mononuclear
Fecal metabolomics: assay performance and association with colorectal cancer.
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Metabolomic analysis of feces may provide insights on colorectal cancer (CRC) if assay performance is satisfactory. In lyophilized feces from 48 CRC cases, 102 matched controls, and 48 masked quality control specimens, 1043 small molecules were detected with a commercial platform. Assay
Photosensitized DNA damage and its protection via a novel mechanism.
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UVA, which accounts for approximately 95% of solar UV radiation, can cause mutations and skin cancer. Based mainly on the results of our study, this paper summarizes the mechanisms of UVA-induced DNA damage in the presence of various photosensitizers, and also proposes a new mechanism for its
Effect of orally administered dipterinyl calcium pentahydrate on oral glucose tolerance in diet-induced obese mice.
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Calcium pterins have been shown to be significant immunotherapeutic agents in models of breast cancer, hepatitis B, and tuberculosis (Bacillus Calmette-Guérin mycobacteria). These compunds modulate the immuno-enzyme indoleamine 2,3-dioxygenase (IDO) and the blood levels of several identified
Unexpected photoactivation pathways in a folate-receptor-targeted trans-diazido Pt(iv) anticancer pro-drug
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A conjugate between a photoactive trans-diazido Pt(iv) pro-drug, trans,trans,trans-[Pt(N3)2(OH)2(py)2], and folic acid has been synthesized and fully characterized by high resolution ESI-MS, NMR and UV-vis spectroscopy. Photoactivation of the Pt-folate conjugate with visible light confirmed the
Regulation of tetrahydrobiopterin synthesis and bioavailability in endothelial cells.
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Tetrahydrobiopterin (BH4) is a member of the pterin family that has a core structure of pyrazino-2,3-d-pyrimidine rings. Because BH4 is an essential cofactor for the biosynthesis of nitric oxide (a major vasodilator), there is growing interest in BH4 biochemistry in endothelial cells (the cells that
Dipterinyl calcium pentahydrate inhibits intracellular mycobacterial growth in human monocytes via the C-C chemokine MIP-1β and nitric oxide.
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Tuberculosis remains one of the top three leading causes of morbidity and mortality worldwide, complicated by the emergence of drug-resistant Mycobacterium tuberculosis strains and high rates of HIV coinfection. It is important to develop new antimycobacterial drugs and immunomodulatory therapeutics
Enhancement of folates in plants through metabolic engineering.
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Humans depend on plants as a major source of dietary folates. Inadequate dietary levels of the vitamin folate can lead to megaloblastic anemia, birth defects, impaired cognitive development, and increased risk of cardiovascular disease and cancer. The biofortification of folate levels in food crops
Metabolic features of the cell danger response.
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The cell danger response (CDR) is the evolutionarily conserved metabolic response that protects cells and hosts from harm. It is triggered by encounters with chemical, physical, or biological threats that exceed the cellular capacity for homeostasis. The resulting metabolic mismatch between
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