摘要:
A method for making a pharmaceutical composition is described. The composition is comprised of an organic acid derivative of alpha tocopherol, and may additionally comprise other lipids. The composition may be in the form of liposomes, and as such are associated with or entrap a bioactive agent. Particularly suited for such systems are drugs stable at acidic pH, for example drugs having imidazole groups, such as pilocarpine. The composition requires a stabilizer to maintain the bilayer phase of the organic acid derivative of alpha tocopherol in a low pH environment. Such a stabilizer is for example a detergent. Upon in vivo administration of the system and concomitant increase of pH, viscosity of the preparation increases.
摘要:
A new and substantially improved type of lipid vesicle, called stable plurilamellar vesicles (SPLVs), are described, as well as the process for making the same and X-ray diffraction methods for identifying the same. SPLVs are characterized by lipid bilayers enclosing aqueous compartments containing one or more entrapped solutes, the concentration of such solutes in each aqueous compartment being substantially equal to the emunization of solutes used to prepare the SPLVs. The bilayers of SPLVs are substantially non-compressed. SPLVs are stable during storage and can be used in vivo for the sustained release of compounds and in the treatment of disease.
摘要:
Methods and compositions are described for the preparation of alpha-tocopherol vesicles, the bilayers of which comprise a salt form of an organic acid derivative of alpha-tocopherol such as the Tris salt form of alpha-tocopherol hemisuccinate. The method is rapid and efficient and does not require the use of organic solvents. The alpha-tocopherol vesicles may be used to entrap compounds which are insoluble in aqueous solutions. Such preparations are especially useful for entrapping bioactive agents of limited solubility, thus enabling administration in vivo.
摘要:
Methods and compositions are described for the preparation of lipid vesicles, the bilayers of which comprise a salt form of an organic acid derivative of a sterol such as the tris-salt form of a sterol hemisuccinate. The method is rapid, efficient, and does not require the use of organic solvents. The sterol hemisuccinate vesicles may be used to entrap compounds which are insoluble in aqueous solutions. Such preparations are especially useful for entrapping bioactive agents of limited solubility thus enabling administration in vivo.
摘要:
An assay for detecting SLE antibodies utilizing a novel liposome composition in which there is entrapped a divalent cation responsive indicator. The presence of such antibodies is detected by their stabilization of the supermolecular structure of the liposomes. Such stabilization can be detected, and in certain cases, caused by, the addition of magnesium or calcium ions.
摘要:
For use in a lipid-dependent diagnostic assay, a stable aqueous suspension of a phospholipid which normally has a hexagonal (HII) organization when dispersed in an aqueous medium without detergent, the suspension containing the phospholipid, a detergent, and an aqueous phase. In the stable suspension, the phospholipid remains in suspension at a temperature of 25° C. for at least one hour. The suspension is suitable for providing the phospholipid to an assay for lupus anticoagulants which includes the step of pre-incubating a test sample with the phospholipid.
摘要:
Described herein are liposomes containing etherlipids of the formula: as well as a phosphatidylcholine, a sterol, and a headgroup-derivatized lipid. These liposomes are useful in a variety of therapeutic regimens, including the treatment of cancers and inflammatory disorders.
摘要:
Provided herein is a taxane having a hydrocarbon attached at the 2' and/or 7 positions, the hydrocarbon's alpha position being occupied by a "hydrolysis-promoting group" ("HPG"). Substitution of an HPG for the methylene unit ordinarily occupying the alpha position allows for enhanced in vivo hydrolysis of the hydrocarbon-taxane bond, and hence, for enhanced taxane therapeutic activity. Also provided herein are taxane-containing compositions, and methods of administering taxanes to animals, including those afflicted with cancers.
摘要:
Dehydrated liposomes are prepared by drying liposome preparations under reduced pressure in the presence of one or more protective sugars, e.g., the disaccharides trehalose and sucrose. Preferably, the protective sugars are present at both the inside and outside surfaces of the liposome membranes. Freezing of the liposome preparation prior to dehydration is optional. Alternatively, the protective sugar can be omitted if: (1) the liposomes are of the type which have multiple lipid layers; (2) the dehydration is done without prior freezing; and (3) the dehydration is performed to an end point which results in sufficient water being left in the preparation (e.g., at least 12 moles water/mole lipid) so that the integrity of a substantial portion of the multiple lipid layers is retained upon rehydration. Concentration gradients capable of generating transmembrane potentials can be created across the liposome membranes either before or after dehydration, and the transmembrane potentials resulting from these gradients can be used to load charged materials, e.g., drugs, into the liposomes.
摘要:
This invention provides an interdigitation-fusion liposome comprising an arachidonic acid metabolite, a lipid bilayer comprising a lipid and an aqueous compartment comprising a release-inhibiting buffer. Preferred arachidonic acid metabolites are the prostaglandins, particularly PGE.sub.1. The liposomal formulations can be used to treat animals, particularly humans, for diseases, disorders or conditions which can be ameliorated by prostaglandins, e.g., cell activation/adhesion disorders and inflammatory disorders.