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Страница 1 од 23 резултати
The activity of class I, II, III and IV alcohol dehydrogenase isoenzymes and aldehyde dehydrogenase in breast cancer.
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Alcohol dehydrogenase (ADH) and aldehyde dehydrogenase (ALDH) play a significant role in the metabolism of many biological substances. ADH participates in the metabolism of ethanol, retinoic acid, lipid peroxidation products, leukotriene and glutathione metabolism. ALDH is responsible for oxidation
The synthesis of 7 alpha-methyl-substituted estrogens labeled with fluorine-18: potential breast tumor imaging agents.
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The 7 alpha-methyl substituent is reported to increase the binding affinity of estradiol for the estrogen receptor (ER). In order to evaluate whether this substituent would improve the in vitro binding characteristics and the in vivo tissue distribution of 18F labeled estrogens that we are
16 beta-([18F]fluoro)estrogens: systematic investigation of a new series of fluorine-18-labeled estrogens as potential imaging agents for estrogen-receptor-positive breast tumors.
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In order to understand the structural features that might lead to an estrogen receptor (ER) based breast tumor imaging agent with improved uptake characteristics, we have synthesized several new analogs of 16 beta-fluoroestradiol (beta FES) and studied their tissue distribution in immature rats. The
Fluorine-18-labeled progestin ketals: synthesis and target tissue uptake selectivity of potential imaging agents for receptor-positive breast tumors.
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We have studied two new fluorine-substituted progestins as potential imaging agents for progesterone-receptor-positive human breast tumors. The steroids are 16 alpha, 17 alpha-fluoroacetophenone ketals of 16 alpha, 17 alpha-dihydroxyprogesterone and 16 alpha, 17 alpha,
Non invasive PET imaging of CDK4/6 activation in Breast Cancer.
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The cell cycle is a progression of four distinct phases (G1, S, G2, M), with various cycle proteins being essential in regulating this process. In breast cancer, alterations in the cell cycle and uncontrolled proliferation led to several studies interrogating the relationship between cyclins and
A global drug inhibition pattern for the human ATP-binding cassette transporter breast cancer resistance protein (ABCG2).
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In this article, we explore the entire structural space of registered drugs to obtain a global model for the inhibition of the drug efflux transporter breast cancer resistance protein (BCRP; ABCG2). For this purpose, the inhibitory effect of 123 structurally diverse drugs and drug-like compounds on
Preparation of (99m)Tc-labelled methotraxate by a direct labeling technique as a potential diagnostic agent for breast cancer and preliminary clinical results.
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Methotrexate (MTX) is being used in clinical oncology for the treatment of a wide variety of cancers. The aim of the present study was to label directly MTX with (99m)Tc by using Sn/pyrophosphate as reducing agent and to use this labeled compound as a potential anticancer radiopharmaceutical for
18F-labeled estradiol derivative for targeting estrogen receptor-expressing breast cancer.
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BACKGROUND
A novel radiotracer 1‑(2‑(2‑(2‑[18F]fluoroethoxy)ethoxy)ethyl)‑1H‑1,2,3‑triazole‑estradiol ([18F]FETE) was successfully synthesized, characterized and evaluated in mice for estrogen receptor (ER)-positive breast cancer targeting with positron emission tomography (PET) imaging.
METHODS
The
Oxohexestrol derivatives labeled with fluorine-18. Synthesis, receptor binding and in vivo distribution of two non-steroidal estrogens as potential breast tumor imaging agents.
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We have prepared two non-steroidal estrogens in the 2-oxohexestrol series labeled with the positron-emitting radionuclide fluorine-18, 1-fluoro-5-oxohexestrol (4) and 1-fluoro-2-oxohexesterol (5). We anticipated that the polar ketone function at the interior of these ligands would reduce their level
Quantitative investigation of the brain-to-cerebrospinal fluid unbound drug concentration ratio under steady-state conditions in rats using a pharmacokinetic model and scaling factors for active efflux transporters.
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A pharmacokinetic model was constructed to explain the difference in brain- and cerebrospinal fluid (CSF)-to-plasma and brain-to-CSF unbound drug concentration ratios (Kp,uu,brain, Kp,uu,CSF, and Kp,uu,CSF/brain, respectively) of drugs under steady-state conditions in rats. The passive permeability
Design of high payload PLGA nanoparticles containing melittin/sodium dodecyl sulfate complex by the hydrophobic ion-pairing technique.
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The water-soluble peptide, melittin, was modified with an anionic agent, sodium dodecyl sulfate by hydrophobic ion-pairing. Investigations showed that the formed complex was very soluble in organic solvent, especially, in dimethylsulfoxide and dehydrated alcohol. Furthermore, the physiochemical
The in vitro antitumour activity of novel, mitochondrial-interactive, gold-based lipophilic cations.
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In this study we compared the effects of two previously described antimitochondrial gold complexes, that is, [A] [Au(dppe)(2)]Cl and [B] [Au(d4pype)(2)]Cl with two novel lipophilic cations, that is, [C] [Au(dpmaaH(2))(dpmaaSnMe(2))]Cl and [D] [Au(dpmaaSnMe(2))(2)]Cl as antimitochondrial agents. The
The effect of suspended particles coated by humic acid on the toxicity of pharmaceuticals, estrogens, and phenolic compounds.
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The sorption characteristics of 10 organic chemicals, categorized as pharmaceuticals, estrogens and phenols, onto synthetic suspended particle (i.e., alumina) coated with humic acid were investigated according to their octanol-water partition coefficient (K(ow)). Chemical analyses were performed
P-glycoprotein, multidrug resistance-associated proteins and human organic anion transporting polypeptide influence the intracellular accumulation of atazanavir.
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BACKGROUND
Drug efflux (for example, P-glycoprotein [P-gp], multidrug resistance-associated proteins [MRPs] and breast cancer resistance protein [BCRP]) and influx (for example, human organic anion transporting polypeptide [hOCTP] or human organic anion transporting polypeptide [hOATP]) transporters
Preparation and characterization of 99mTc(CO)3-BPy-RGD complex as alphav beta3 integrin receptor-targeted imaging agent.
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The aim of this study is to develop a novel arginine-glycine-aspartic acid (RGD) peptide-containing ligand for (99m)Tc labeling as alpha(v)beta(3) integrin receptor-targeted imaging agent. BPy-RGD conjugate was successfully synthesized by coupling of 5-carboxylate-2,2'-bipyridine and c(RGDyK)
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