摘要:
Disclosed in the present disclosure is a biodegradable amphiphilic polymer containing disulfide in the side chain, a self-crosslinked polymeric vesicle thereof and an application in the targeted therapy of lung cancer. The polymer is obtained by an activity-controllable ring-opening polymerization based on a cyclic carbonate monomer containing a functional group of dithiolane ring, which has a controllable molecular weight and a narrow molecular weight distribution, and does not require processes of protection and deprotection; the polymer obtained by the ring-opening polymerization of the cyclic carbonate monomer of the present disclosure has biodegradability and can be used to control the drug release system, the prepared lung cancer-targeted reduction-sensitive reversibly-crosslinked polymeric vesicle as a nanomedicine carrier supports stable long circulation in vivo. However, it is highly enriched in lung cancer tissues, enter cells efficiently, and rapidly decrosslinks in the cells to release drugs, so as to kill cancer cells with high potency and specificity and inhibit the growth of tumor effectively without causing toxic and side effects.
摘要:
Disclosed are compositions that contain a plurality of biocompatible self-assembling molecules that transform from isolated molecules or spherical micelles while in blood serum into cylindrical nanofibers in the acidic extracellular environment of tumors, which can be used to achieve a higher relative concentration of imaging drug delivery, or radiotherapeutic agents at the tumor site compared to non-tumor tissues. This transition is rapid and reversible, indicating the system is in thermodynamic equilibrium.
摘要:
The present invention relates to a process for preparing a macrocyclic ligand and for producing a pharmaceutical liquid formulation comprising a complex of said ligand with a lanthanide or similar compounds. The macrocyclic ligand of the present invention is a derivative of tetraaza macrocycles such as 1,4,7,10-tetraazacyclododecane (cyclen), 1,4,7,10-tetrazacyclotridecan (homocyclen) and 1,4,8,11-tetraazacyclotetradecane (cyclam), such as DOTA, TRITA, TETA, DOTMA, TCE-DOTA, DOTA-pNB, D03A, HP-D03A, D03A-butrol, D03MA, ODOTRA, D03A-L2, DOTP, DOTMP, DO2a, THP, THED, DOTAM, DOTTA. The preferred lanthanide and similar compounds are Gadolinium (Gd), Yttrium (Y) and Terbium (Tb). The process of the present invention aims to obtain an accurate balance between the ligand and the lanthanide, and to avoid the presence of free lanthanide in said formulation, by calculating the necessary amount of ligand for a formulation batch, measuring the moisture content of a sample of the material in said batch, calculating the total amount of moisture present of the batch and calculating the total amount of material which is required to prepare the batch size. In this way, the production of a pharmaceutical liquid formulation comprising a complex of a macrocyclic ligand with lanthanide is more accurate, faster and easier. The present invention is thus useful for the production of pharmaceutical liquid formulations comprising a complex of a macrocyclic ligand with a lanthanide, which can be used as contrast agents for magnetic resonance imaging.
摘要:
The present invention relates to a magnetic resonance structure with a cavity or a reserved space that provides contrast and the additional ability to frequency-shift the spectral signature of the NMR-susceptible nuclei such as water protons by a discrete and controllable characteristic frequency shift that is unique to each MRS design. The invention also relates to nearly uniform solid magnetic resonance T2* contrast agents that have a significantly higher magnetic moment compared to similarly-sized existing MRI contrast agents.
摘要:
The present invention relates to a combination for use in implantable medical devices, comprising at least one signal generating agent, which in a physical, chemical and/or biological measurement or verification method leads to detectable signals, at least one material for manufacture of an implantable medical device and/or at least one component of an implantable medical device, and at least one therapeutically active agent, which in an animal or human organism fulfills directly or indirectly a therapeutic function. The invention further relates to implantable medical devices comprising such a combination, and to methods for the determination of the extent of active agent release from implantable medical devices comprising such a combination.
摘要:
A magnetically opaque medical device is disclosed wherein a contrast agent is incorporated into the actual device. The medical device is generally comprised of a base material forming the structure of the device and a contrast agent, such as tocopherol and tocopherol derivative solutions or suspensions, gadolinium, or nickel sulfate integrated into the base material itself or posited on a substantial portion of an exterior surface of the device. The device may include other additional functional agents and layers.
摘要:
A method for visualizing a blood clot or plaque disposed within a body lumen comprising: binding a contrasting complex comprising a contrast material and a thrombolytic material or a clot dissolving agent to the blood clot or plaque; and visualizing the blood clot or plaque over a period time by a visualizing system.