Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Liposomes
Patent
1988-02-23
1990-02-13
Robinson, Douglas W.
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Liposomes
514963, A61K 3722
Patent
active
049005561
ABSTRACT:
A system for controlled release both in vivo and in vitro of entrapped substances, either at a constant rate over a period of time or in discrete pulses, is disclosed. Biologically active substances, such as drugs, hormones, enzymes, genetic material, antigens including viruses, vaccines, or inorganic material, such as dyes and nutrients, are entrapped in liposomes which are protected from the biological environment by encapsulation within semi-permeable microcapsules. Release of the entrapped substance into the surrounding environment is governed by the permeability of both the liposome and microcapsule walls to the substance. Permeability of the liposome is engineered by modifying the composition and method for making the liposomes, thereby producing liposomes which are sensitive to a specific stimuli such as temperature, pH, or light; or by including a phospholipase within some or all of the liposomes or the microcapsule; or by destabilizing the liposomes to break down over a period of time; or by any combination of these features.
REFERENCES:
patent: 4145410 (1979-03-01), Sears
patent: 4217344 (1980-08-01), Vanlerberghe et al.
patent: 4314557 (1982-02-01), Chandrasekaran
patent: 4352883 (1982-10-01), Lim
patent: 4708861 (1987-11-01), Popescu et al.
patent: 4731210 (1988-03-01), Weder et al.
patent: 4761288 (1988-08-01), Mezei
"Liposomes", Gregoriadis, Drug Carriers in Biology and Medicine, Ch.14, 287-341 (1979, Academic Press, NY).
"Lysosomal Localization of B-Fructofuranosidase-Containing Liposomes Injected Into Rats", Biochem. J., 129, 123-133 (1972), Gregoriadis et al.
Francis Szoka et al., "Procedure for Preparation of Liposomes w/Large Internal Aqueous Space and High Capture by Reverse-Phase Evaporation", Proc. Natl. Acad. Sci., USA, 75(9), 4194-4198 (1978).
"A Simple Method for the Preparation of Homogeneous Phospholipid Vesicles", Biochemistry, 16(12), 2806-2810 (1977), Barenholz et al.
"Preparation of Homogeneous Single-Walled Phosphatidylcholine Vesicles", Methods in Enzymol., 32, 485-489 (1974), Huang et al.
"The Preparation of Large Single Bilayer Liposomes by a Fast and Controlled Dialysis", Biochem. Biophys. Acta, 512, 147-155 (1978), Milsmann et al.
"Large Volume Liposomes by an Ether Vaporization Method", D. Deamer et al., Biochem. Biophys. Acta, 443, 629-634 (1976).
"Drug Entrapment in Liposomes", Gregoriadis, Febs Letters, 36(3), 292-296 (1973).
"pH-Triggering of Phosphatidylcholine Membrane Properties Via Complexation w/Synthetic Poly(Carboxylic Acid)s", Seki et al., Proc. of ACS Div. Polymer Material Mtg, Philadelphia, PA, ACS, 51, 216-219 (1984).
"Photoresponsive Artificial Membrane, Regulation of Membrane Permeability of Liposomal Membrane by Photoreversible Cis-Trans Isomerization of Azobenzenes", Kano et al., Photo Chem. Photobiol., 34, 323-329 (1981).
"Photoresponsive Membranes, Regulation of Membrane Properties by Photoreversible Cis-Trans Isomerization of Azobenzenes", Kano et al., Chem. Lett, 421-424 (1980).
"pH Sensitization of Phospholipid Vesicles via Complexation W/Synthetic Poly(Carboxylic Acid)s", Tirrell et al., Annals of NY Acad. of Sci., vol. 446, 237-248 (Jun. 21, 1985).
"Immobilization of Whole Bacterial Cells to Aid in the Saccharification of Cellulosic Carbohydrate Substrates", Wheatley et al., Adv. Biotech., pp. 47-54 (1980).
"Possible Use of Agarose Gels as Encapsulating Media for Transplantation of Islets of Langerhans", Howell et al., Proc. Physiol. Soc., 20p-21p (Nov. 1981).
"Influence of Liposomal Drug Entrapment on Percutaneous Absorption", Ganesan et al., Int. J. of Pharmaceutics., 20, 139-154 (1984).
"Sustained Delivery of Polypeptide Hormones Using the Liposome-Collagen Gel Matrix", Weiner et al., Fed. of Am. Soc. of Expt. Biol., 69th Annual Mtg., Anaheim, CA, Fed. Abst. 44(4), 4848 (1985).
Papahadjopoulos et al., Biochem. Biophys. Acta, 135, 639-652 (1967).
Jackson et al., Biochemistry, 21, 4576-4582 (1982).
Eisen Herman N.
Langer Robert S.
Wheatley Margaret A.
Henley III Raymond J.
Massachusetts Institute of Technology
Robinson Douglas W.
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