Drug – bio-affecting and body treating compositions – In vivo diagnosis or in vivo testing – Magnetic imaging agent
Patent
1995-05-18
1997-10-21
Hollinden, Gary E.
Drug, bio-affecting and body treating compositions
In vivo diagnosis or in vivo testing
Magnetic imaging agent
424646, 424648, 514 8, 514 54, 514 57, 514 60, 436173, 436806, 423633, 1286534, 128654, A61B 5055
Patent
active
056793235
ABSTRACT:
A new class of magnetic resonance (MR) contrast agents are described whose in vivo biodistribution is based upon the ability of certain cells to recognize and internalize macromolecules, including the MR contrast agents of the present invention, via a process which substantially involves receptor mediated endocytosis. The RME-type MR contrast agents described herein comprised of biodegradable superparamagnetic metal oxides associated with a variety of macromolecular species, including but not limited to, serum proteins, hormones, asialoglycoproteins, galactose-terminal species, polysaccharides, arabinogalactan, or conjugates of these molecules with other polymeric substances such as a poly(organosilane) and dextran. One of the advantages of these MR contrast agents is that they may be selectively directed to those cells which bear receptors for a particular macromolecule or ligand and are capable of undergoing receptor mediated endocytosis. An MR contrast agent prepared from biodegradable superparamagnetic iron oxide and asialofetuin, or more preferably arabinogalactan, for example, is selectively localized in the hepatocytes the liver with no significant accumulation in the spleen. An MR experiment which can be carried out shortly after administration to the subject of the contrast agents of the invention can thus provide a method for obtaining an enhanced MR image, as well as valuable information regarding the functional or metabolic state of the organ or tissue under examination. Preparative methods, biodistribution data, and time function MR images are further provided.
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Josephson Lee
Menz Edward T.
Advanced Magnetics Inc.
Hollinden Gary E.
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