112 results about "Tumor hypoxia" patented technology

The invention relates to preparation and application of medicine-carrying polydopamine / dendrimer-gold nanoparticles. The preparation comprises the steps of modifying dendrimer-gold nanoparticles to the surfaces of polydopamine nanoparticles, and performing polyethylene glycol modification and anticancer medicine adriamycin loading. Obtained composite nanoparticles having a core-satellite structurecan be subjected to acid response to release minisize satellites, medicine delivery in deep tumors is realized, and medicine tolerance generated by tumor hypoxia is relieved; and adriamycin is released at a fixedpoint under internal (acid and hydrogen peroxide) and external (near infrared light) stimulation. The obtained composite nanoparticles have favorable biocompatibility, can realize optoacoustic diagnosis and photothermal treatment on tumor locations, and what's more, can realize remarkable restraining effects on tumor growth. Through the adoption of the method disclosed by the invention, the treatment effects of traditional chemical medicines can be notably improved, more comprehensive three-dimensional tumor treatment is realized, and a new thinking is provided for diagnosis and treatment of malignant tumors.

The invention discloses a composite nanoparticle for sensitizing tumor radiotherapy and a preparation method and application of the composite nanoparticle. The composite nanoparticle comprises proteinand bismuth selenide and manganese dioxide which grow on the protein. The preparation method comprises the steps that a manganese salt solution is added into a aqueous dispersion of bismuth selenide-protein nanoparticles, after uniform mixing is carried out, a strong alkaline solution is added, the pH value is adjusted to alkaline, a heating temperature control reaction is carried out, ultrafiltration and washing are carried out, and the composite nanoparticle is obtained. The composite nanoparticle has the advantages that the water dispersibility and biocompatibility are good, radiotherapy is sensitized by increasing the local radiation dosage through bismuth selenide and improving tumor hypoxia through manganese dioxide, and computed tomography, magnetic resonance and photoacoustic multimode imaging angiography can be achieved simultaneously; the preparation method of the composite nanoparticle is simple, convenient and practical, the condition is mild, the controllability is good,and the implementation and promotion are easy; the composite nanoparticle can achieve the integration of targeted radiotherapy sensitization, diagnosis and treatment of the tumor, and has a broad application prospect in the fields of nano-medicine, disease diagnosis, tumor treatment and the like.

The invention provides a preparation method of Cu2MoS4 nano-enzyme, and the method comprises the following steps: mixing cuprous oxide, an organic carbon source, an inorganic molybdenum source and anorganic sulfur source in an organic solvent, and carrying out high-temperature calcination to obtain the hollow Cu2MoS4 nano-enzyme. Compared with the prior art, the Cu2MoS4 nano-enzyme prepared by the invention has catalase activity and greatly relieves tumor hypoxia, and meanwhile, the nano-enzyme also has peroxidase activity and can consume glutathione overexpressed in a tumor, so that an antioxidant defense system of the tumor is destroyed, and the chemokinetic treatment efficiency is enhanced; two pairs of redox couples exist, the redox couples can react with hydrogen peroxide to generatehigh-toxicity hydroxyl radicals, a remarkable chemical and dynamic curative effect is achieved, meanwhile, the nano-enzyme has strong absorption in the whole near-infrared area, and photo-thermal therapy can be achieved; and under laser excitation, superoxide anion free radicals can be generated and used for photodynamic therapy.

The invention relates to a compound for detecting tumor hypoxia disclosed as Formula I, a preparation method and application thereof, and a kit containing the compound. The groups in the formula are disclosed in the specification. The compound can be used for detecting hypoxia of tumor tissues, can respond to changes of partial oxygen pressure and reducibility of partial tissues, and provides conditions for early detection of cancers. The compound has the advantages of novel structure, simple synthesis process, high detection sensitivity, high fluorescence enhancement multiple, no trauma and the like, and can be used for cell detection and even living body detection.

The invention provides a nitroreductase-specific fluorescent probe and the preparation thereof and a reagent for applying the nitroreductase-specific fluorescent probe to tumor-targeted fluorescence imaging and monitoring of tumor hypoxia. The reagent is connected by tumor biomarker identifying groups (sensor), tumor targeted groups (target) and fluorescent groups (dye) via chemical bonds. The reagent can be used in the tumors with hypoxic microenvironment and high expression of nitroreductase based on tumor hypoxia and the high expression of nitroreductase in hypoxic tumors. Combined with a fluorescence imager, the reagent can be used in tumor targeted fluorescence imaging, tumor hypoxia monitoring and the monitoring of tumor metastasis, etc. The reagent realizes high sensitivity and high specificity in application and provides an effective tool for medical study of cancer and clinical monitoring and treatment of tumor metastasis, thereby having a good application prospect in tumor-targeted fluorescence imaging, tumor hypoxia monitoring and monitoring of tumor metastasis.

The invention discloses a synthesis method and application of an anthraquinone polypyridine ligand and anthraquinone-ruthenium polypyridine complex. The anthraquinone-ruthenium polypyridine complex has good inhibition activity on the growth of hypoxic cells, and generates obvious fluorescence through reduction in the hypoxic cells; and thus, the compound is a novel biological reduction type hypoxic cell anti-cancer drug and a specific fluorescence probe as well as a drug with application value and taking tumor hypoxia as a target point and a fluorescence probe.

The invention discloses a nitro imidazole xanthogenate complex marked by TcO with the formula of TcO (NMXT)2; in the formula, NMXT represents a compound containing nitro imidazole xanthogenate. The complex adopts Tc(V)O as a central nucleus and has a geometric configuration with the shape of an irregular square pyramid, wherein O atom in Tc=O bond is positioned at the top point and four sulphur atoms provided by two xanthogenate ligand molecules are positioned at the four points of the bottom surface. By the technical steps of synthesis of ligand NMXT and preparation of TcO (NMXT)2 complex, the TcO (NMXT)2 complex is obtained. The nitro imidazole xanthogenate complex has high radiochemical purity and good stability, has higher uptake value and good detention through in tumor and higher ratio of tumor / muscle, is widely applied to tumor imaging of human body and animal organs and is a novel tumor hypoxia imaging agent which is conveniently promoted and applied.

The invention relates to a preparation method and application of polyethylene glycol polydopamine-gold nanoparticles. The preparation method comprises the steps of preparing the polydopamine nanoparticles through a one-pot method; modifying the surface of the polydopamine through polyethylene glycol; loading gold nanoparticles by utilizing the chelating ability of polydopamine; and performing performance evaluation on the obtained final product. The method disclosed by the invention is simple and easy to implement, and the prepared polyethylene glycol polydopamine-gold nanoparticles have goodmorphology uniformity and oxygen production capacity and have potential tumor hypoxia relieving capacity and photo-thermal treatment capacity.

The invention provides agents that target carbonic anhydrase, which can be used as imaging agents or therapeutic agents. The agents can be used to image tumor hypoxia as well as other physiological processes in a subject.

Methods and compositions for enhancing the ability of hypoxia-activated bioreductive agents to kill tumor cells within solid tumors are provided. Local regions of hypoxia are created within a tumor, or within a region containing a tumor, resulting in enhanced activation of hypoxia-activated bioreductive agents (e.g. tirapazamine) within the local region. The activated hypoxia-activated bioreductive agents kill tumor cells in the hypoxic region by catalyzing DNA stand breakage within the tumor cells. Because the activity is localized, side effects that typically occur as a result of systemic administration of bioreductive agents are reduced.

The invention discloses a new function of cyanobacteria. Under irradiation of specific wave length lasers, and through photosynthesis, oxygen is generated, the condition of oxygen deficiency caused bytumors can be improved, and the problem of reverse tolerance of chemicals, such as adriamycin can be effectively solved. The cyanobacteria is subjected to photosynthesis in light to generate oxygen,and under the aerobic condition, hypoxia factors are reduced for tumor cells, so that multidrug resistance genes can be restrained, expression of P-glycoprotein is restrained to restrain exocytosis ofcancer cells on adriamycin, the reverse tolerance of the cancer cells on the reverse tolerance is overcome, and the antitumor treatment effect can be increased.

The invention provides a vermiculite nanosheet and a preparation method thereof. The preparation method comprises the steps: adding vermiculite into an alkali metal salt solution modifier, carrying out intercalation treatment, and stripping to obtain the vermiculite nanosheets, wherein the alkali metal salt modifier with the concentration of 0.1-10 mol / L is added into each milligram of vermiculite. The vermiculite nanosheet provided by the invention not only can be used as a nano reinforcing material in industries such as papermaking, coating, paint, plastic, rubber and the like, but also can be used as an oxygen self-supply platform to generate oxygen and various active oxygen, and is effectively used for preparing biomedical photodynamic therapy medicines, overcoming tumor hypoxia and enhancing the effect of photodynamic therapy. The preparation method of the vermiculite nanosheet provided by the invention is simple in process, green and environment-friendly, and convenient for industrial application.