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Страна 1 од 111 резултати
Fullerene-based low toxic nanocationite particles (porphyrin adducts of cyclohexyl fullerene-C(60)) to treat hypoxia-induced mitochondrial dysfunction in mammalian heart muscle.
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BACKGROUND
This is the first report on the targeted delivery of fullerene-based low toxic nanocationite particles (porphyrin adducts of cyclohexyl fullerene-C(60)) to treat hypoxia-induced mitochondrial dysfunction in mammalian heart muscle.
METHODS
The magnetic isotope effect generated by the
Effect of hypoxia on porphyrin metabolism in bone marrow mesenchymal stem cells.
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Under hypoxic conditions, aminolevulinic acid-induced accumulation of porphyrin pigments and increase in heme content was observed in bone marrow mesenchymal stem cells. The expression of transferrin receptor CD71 responsible for Fe(2+) transport into the cell was also enhanced. Blockade of
[Chronic hypoxia state as one of the factors of increased fluorescence of endogenous porphyrins in alive biological tissues].
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The hypothesis about the influence of chronic hypoxia in soft alive tissues on the intensity of He-Ne laser-induced fluorescence of endogenous porphyrins in tissues in the red region of the optical spectrum is discussed. Some theoretical prerequisites for enormous accumulation of porphyrins in soft
Novel Fluorinated Porphyrins Sensitize Tumor Cells to Photodamage in Normoxia and Hypoxia: Synthesis and Biocompatible Formulations.
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BACKGROUND
Hypoxia renders tumor cells refractory to treatment. One way to overcome this problem is the design of drug delivery systems that contain the antitumor agent within an oxygen supply medium.
OBJECTIVE
to evaluate whether the perfluorocarbon liquids (capable of retaining up to 50% v/v
Perfluorocarbon@Porphyrin Nanoparticles for Tumor Hypoxia Relief to Enhance Photodynamic Therapy against Liver Metastasis of Colon Cancer
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Photodynamic therapy (PDT) shows great promise for treatment of colon cancer. But practically, it is a great challenge to use a nanocarrier for co-delivery of both photosensitizer and oxygen to improve PDT against PDT-induced hypoxia, which is closely related to the tumor metastasis. Hence, an
Oxygen Availability for Porphyrin Biosynthesis Enzymes Determines the Production of Protoporphyrin IX (PpIX) during Hypoxia.
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5-Aminolevulinic acid (ALA), a precursor of porphyrin, is specifically converted to the fluorescent substance protoporphyrin IX (PpIX) in tumors to be used as a prodrug for photodynamic therapy and diagnosis. Hypoxia, a common feature of solid tumors, decreases the efficacy of ALA-based photodynamic
Albumin/sulfonamide stabilized iron porphyrin metal organic framework nanocomposites: targeting tumor hypoxia by carbonic anhydrase IX inhibition and T1-T2 dual mode MRI guided photodynamic/photothermal therapy.
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Exploring a nanotheranostic agent with image guided highly efficient therapeutic properties is greatly significant for tumor screening and treatment. Herein, we construct a novel nanoplatform, composed of low cost bovine serum albumin (BSA), sulfonamides (SAs) and iron porphyrin nanoscale metal
Effects of plasma membrane ABCB6 on 5-aminolevulinic acid (ALA)-induced porphyrin accumulation in vitro: tumor cell response to hypoxia.
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BACKGROUND
Currently, 5-aminolevulinic acid-based photodynamic diagnosis (ALA-PDD) is used to detect tumors during surgery and exploit tumor-specific accumulation of protoporphyrin IX (PpIX) after administration of ALA. In a recent study, we showed that the human ATP-binding cassette transporter
Phosphorescent Starburst Pt(II) Porphyrins as Bifunctional Therapeutic Agents for Tumor Hypoxia Imaging and Photodynamic Therapy.
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It is very meaningful to develop bifunctional therapeutic agents which can monitor the tumor hypoxia in real time as well as maintain good photodynamic therapy (PDT) effect under hypoxia. To achieve it, herein, a series of hydrophilic phosphorescent starburst Pt(II) porphyrins as bifunctional
Transcriptional Profile Alteration of Peripheral Blood in Chronic Hypoxia.
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Objective Many physiological and pathological conditions, including cyanotic congenital heart diseases (CCHD), are accompanied by chronic hypoxia, which might interfere with the transcription process. However, the transcriptome profile in peripheral blood under hypoxia is still unidentified. The
Compact Conjugated Polymer Dots with Covalently Incorporated Metalloporphyrins for Hypoxia Bioimaging.
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Hypoxia is closely related to multiple diseases, especially in tumors, which increases the aggressiveness and drug resistance of cancer cells. Precise hypoxia imaging is of great significance for cancer diagnosis and the evaluation of therapeutic effects. A kind of hydrophobic polymer (i.e.,
In Situ Photocatalysis of TiO-porphyrin Encapsulated Nanosystem for Highly Efficient Oxidative Damage against Hypoxic Tumors.
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Reactive oxygen species (ROS)-mediated cell apoptosis has been a significant strategy for tumor oxidative damage, while tumor hypoxia is a major bottleneck for efficiency. Here, a novel TiO-porphyrin nanosystem (FA-TiOPs) is designed by encapsulating TiO-porphyrin (TiOP) in folate-liposome. The
Relationship of tumor hypoxia and response to photodynamic treatment in an experimental mouse tumor.
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The relationship between tumor oxygenation and the effectiveness of photodynamic therapy (PDT) was studied in vitro and in vivo using the RIF mouse tumor model. The oxygen dependence of photodynamic inactivation of RIF cells, which had been exposed to 25 mg/kg porphyrin (dihematoporphyrin ether) in
Evidence for the presence of a guanine quadruplex forming region within a polypurine tract of the hypoxia inducible factor 1alpha promoter.
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The promoter of the hypoxia inducible factor 1 alpha (HIF-1alpha) gene has a polypurine/polypyrimidine tract (-65 to -85) overlapping or adjacent to several putative transcription factor binding sites, and we found that mutagenesis of this region diminished basal HIF-1alpha expression.
Amphiphilic trismethylpyridylporphyrin-fullerene (C70) dyad: an efficient photosensitizer under hypoxia conditions.
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Amphiphilic trismethylpyridylporphyrin-C70 (PC70) dyad with improved photosensitization has been successfully prepared. The PC70 dyad forms a liposomal nanostructure through molecular self-assembling. An increased absorption coefficient in the visible region, good
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