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Sivu 1 alkaen 107 tuloksia
Mitochondrial targeting for photochemotherapy. Can selective tumor cell killing be predicted based on n-octanol/water distribution coefficients?
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The concept of mitochondrial targeting for chemo- and photochemotherapy of neoplastic diseases has its origin in the observation that enhanced mitochondrial transmembrane potential is a common tumor cell phenotype. As a result of this enhanced transmembrane potential, a number of cationic dyes
PET imaging of prostate tumors with 18F-Al-NOTA-MATBBN.
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Overexpression of the gastrin-releasing peptide receptor (GRPR) in prostate cancer provides a promising target for detection the disease. MATBBN is a new bombesin analog originating from the GRPR antagonists with a hydrophilic linker. In this study NOTA-conjugated MATBBN was labeled by the Al(18)F
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,
Radiosynthesis and preclinical evaluation of [18F]FEM as a potential novel PET probe for tumor imaging.
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In the 21st century, the incidence and mortality of cancer, one of the most challenging diseases in the world, have rapidly increased. The purpose of this study was to develop 2-(2-[18F]fluoroethoxy)ethyl 4-methylbenzenesulfonate ([18F]FEM) as a positron emission tomography
Preclinical development and current status of the fluorinated 2-nitroimidazole hypoxia probe N-(2-hydroxy-3,3,3-trifluoropropyl)-2-(2-nitro-1-imidazolyl) acetamide (SR 4554, CRC 94/17): a non-invasive diagnostic probe for the measurement of tumor hypoxia by magnetic resonance spectroscopy and imaging, and by positron emission tomography.
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Hypoxia occurs to a variable extent in a vast majority of rodent and human solid tumors. It results from an inadequate and disorganized tumor vasculature, and hence an impaired oxygen delivery. A probe for the non-invasive detection of tumor hypoxia could find important utility in the selection of
Targeting hypoxia in tumors using 2-nitroimidazoles with peptidic chelators for technetium-99m: effect of lipophilicity.
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Tumor hypoxia is an important prognostic factor for response to therapy. Radiolabeled 2-nitroimidazoles have been used for imaging hypoxia, and the octanol/water partition coefficient (P) of these compounds appears to play a crucial role in their suitability for imaging. A series of 11
Designing multidrug-resistance modulators circumventing the reverse pH gradient in tumours.
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Multidrug-resistant tumours often exhibit a reverse pH gradient (acid outside), as they have an acid extracellular pH (pHe) and a neutral alkaline intracellular pH (pHi). This study was designed to test the hypothesis that the ability of lipophilic drugs to mediate multidrug resistance (MDR)
Analogues of hexamethylmelamine. The anti-neoplastic activity of derivatives with enhanced water solubility.
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The preparation of some water soluble analogues of the tumour growth inhibitory hexamethylmelamine is described. The ultra-violet absorption characteristics, solubility and n-octanol/water partition coefficients of these new derivatives and some related compounds have been determined. Rates of
The anti-tumour properties and biodistribution (as determined by the radiolabeled equivalent) of Au-compounds intended as potential chemotherapeutics.
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The anti-tumour activity of the Au (I) phosphine complex [Au(dppe(2)]Cl was first discovered in the mid 1980s although promising results were obtained it did not pass clinical studies because of its toxicity to organs such as the liver and heart. The aim of this study was to determine whether the
Self-assembled Peptide Nanoparticles for Efficient Delivery of Methotrexate into Cancer Cells.
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The low cellular uptake of Methotrexate (MTX), a commonly used anticancer drug, is a big challenge for efficient cancer therapy. Self-assembled peptide nanoparticles (SAPNs) are one of the major classes of peptide vectors that have gained much of attention towards novel drug delivery systems.
Extravascular transport of drugs in tumor tissue: effect of lipophilicity on diffusion of tirapazamine analogues in multicellular layer cultures.
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The extravascular diffusion of antitumor agents is a key determinant of their therapeutic activity, but the relationships between physicochemical properties of drugs and their extravascular transport are poorly understood. It is well-known that drug lipophilicity plays an important role in transport
Structure/activity relationships for the enhancement by electron-affinic drugs of the anti-tumour effect of CCNU.
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Using a regrowth-delay assay, we investigated structure/activity relationships for the enhancement by electron-affinic agents of the anti-tumour effect of the nitrosourea CCNU against the KHT sarcoma in C3H mice. A series of neutral 2-nitroimidazoles similar in electron affinity but varying in
Physico chemical characterization of a novel anti-cancer agent and its comparison to Taxol(®).
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Every year several thousand compounds are screened for their anti-cancer activity by a general test procedure amongst which only few selected move past the in vitro screening process. This may be due to the intrinsic property of the drug substance. Therefore, a complete physicochemical
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