Targeted therapeutic delivery systems comprising gas-or gaseous precursor-filled lipid microspheres comprising a therapeutic are described. Methods for employing such microspheres in therapeutic delivery applications are also provided. Targeted therapeutic delivery systems comprising gas-or gaseous
Targeted therapeutic delivery systems comprising gas-or gaseous precursor-filled lipid microspheres comprising a therapeutic are described. Methods for employing such microspheres in therapeutic delivery applications are also provided. Targeted therapeutic delivery systems comprising gas-or gaseous precursor-filled liposomes having a drug encapsulated therein are preferred. Methods of and apparatus for preparing such liposomes and methods for employing such liposomes in therapeutic delivery applications are also disclosed.
대표청구항▼
What is claimed is: 1. A targeted therapeutic delivery system comprising gas-or temperature activated gaseous precursor-filled lipid microspheres, wherein said lipid microspheres comprise a therapeutic compound and a negatively charged lipid, and said gas or temperature activated gaseous precursor
What is claimed is: 1. A targeted therapeutic delivery system comprising gas-or temperature activated gaseous precursor-filled lipid microspheres, wherein said lipid microspheres comprise a therapeutic compound and a negatively charged lipid, and said gas or temperature activated gaseous precursor is selected from the group consisting of perfluorocarbons and sulfur hexafluoride. 2. The targeted therapeutic delivery system of claim 1, wherein said negatively charged lipid is selected from the group consisting of phosphatidylglycerol, phosphatidylserine, and phosphatidic acid. 3. The targeted therapeutic delivery system of claim 2, wherein said negatively charged lipid is phosphatidylserine. 4. The targeted therapeutic delivery system of claim 1, wherein said lipid microspheres further comprise a lipid selected from the group consisting of fatty acids; lysolipids; phosphatidylcholines; phosphatidylethanolamines; sphingolipids; sphingomyelin; glycolipids; glucolipids; glycosphingolipids; phosphatidic acid; palmitic acid; stearic acid; arachidonic acid; oleic acid; lipids bearing sulfonated mono-, di-, oligo-or polysaccharides; lipids with ether and ester-linked fatty acids, polymerized lipids, diacetyl phosphate, stearylamine, cardiolipin, phospholipids with short chain fatty acids of 6-8 carbons in length, synthetic phospholipids with asymmetric acyl chains; and lipids bearing a covalently bound polymer. 5. The targeted therapeutic delivery system of claim 4, wherein said polymer has a molecular weight of from about 400 to about 200,000 daltons. 6. The targeted therapeutic delivery system of claim 5, wherein said polymer has a molecular weight of from about 1,000 to about 20,000 daltons. 7. The targeted therapeutic delivery system of claim 6, wherein said polymer has a molecular weight of from about 2,000 to about 8,000 daltons. 8. The targeted therapeutic delivery system of claim 4, wherein said lipid bearing a covalently bound polymer comprises a compound of the formula XCHY--(CH2)n-O--(CH2)n-YCHX wherein X is an alcohol group, Y is OH or an alkyl group and n is 0 to about 10,000. 9. The targeted therapeutic delivery system of claim 8, wherein said polymer is selected from the group consisting of polyethyleneglycol, polyvinylpyrrolidone, polyvinylalcohol and polypropyleneglycol. 10. The targeted therapeutic delivery system of claim 9, wherein said polymer is polyethyleneglycol. 11. The targeted therapeutic delivery system of claim 4, wherein said lipid bearing a polymer comprises from about 1 mole % to about 20 mole %. 12. The targeted therapeutic delivery system of claim 1, further comprising one or more viscosity active compounds. 13. The targeted therapeutic delivery system of claim 12, wherein said viscosity active compound is selected from the group consisting of alcohols, polyalcohols, propyleneglycol, glycerol, sorbitol, cellulose, methylcellulose, xanthan gum, hydroxymethylcellulose, carbohydrates, phosphorylated carbohydrates, and sulfonated carbohydrates. 14. The targeted therapeutic delivery system of claim 1, further comprising one or more emulsifying agents selected from the group consisting of acacia, cholesterol, diethanolamine, glyceryl monostearate, lanolin alcohols, lecithin, monoglycerides, diglycerides, mono-ethanolamine, oleic acid, oleyl alcohol, poloxamer, polyoxyethylene 50 stearate, polyoxyl 35 caster oil, polyoxyl 10 oleyl ether, polyoxyl 20 cetyostearyl ether, polyoxyl 40 stearate, polysorbate 20, polysorbate 40, polysorbate 60, polysorbate 80, propylene glycol diacetate, propylene glycol monostearate, sodium lauryl sulfate, sodium stearate, sorbitan monostearic acid, trolamine, and emulsifying wax. 15. The targeted therapeutic delivery system of claim 1, further comprising suspending agents selected from the group consisting of acacia, agar, alginic acid, aluminum mono-stearate, bentonite, magma, carbomer 934P, carboxymethylcellulose, calcium and sodium and sodium 12, carrageenan, cellulose, dextrin, gelatin, guar gum, hydroxyethyl cellulose, hydroxypropyl methylcellulose, magnesium aluminum silicate, methylcellulose, pectin, polyethylene oxide, polyvinyl alcohol, povidone, propylene glycol alginate, silicon dioxide, sodium alginate, tragacanth, and xanthum gum. 16. The targeted therapeutic delivery system of claim 1, further comprising a vehicle selected from the group consisting of almond oil, corn oil, cottonseed oil, ethyl oleate, isopropyl myristate, isopropyl palmitate, mineral oil, myristyl alcohol, octyl-dodecanol, olive oil, peanut oil, persic oil, sesame oil, soybean oil, and squalene. 17. The targeted therapeutic delivery system of claim 1, wherein said gaseous precursor is temperature activated in vivo. 18. The targeted therapeutic delivery system of claim 1, wherein said gaseous precursor has an activation temperature of about 37째 C. 19. The targeted therapeutic delivery system of claim 1, wherein said gaseous precursor has an activation temperature of from about-150째 C. to about 85째 C. 20. The targeted therapeutic delivery system of claim 1, wherein said gaseous precursor has an activation temperature of from about-125째 C. to about 70째 C. 21. The targeted therapeutic delivery system of claim 1, wherein said gaseous precursor has an activation temperature of from about-100째 C. to about 70째 C. 22. The targeted therapeutic delivery system of claim 1, wherein said lipid microsphere comprises a material having a phase transition temperature of greater than about 20째 C. 23. The targeted therapeutic delivery system of claim 1, wherein said lipid microsphere is less than about 100 μm in outside diameter. 24. The targeted therapeutic delivery system of claim 23, wherein said lipid microsphere is less than about 10 μm in outside diameter. 25. The targeted therapeutic delivery system of claim 1, wherein said therapeutic compound comprises genetic material. 26. The targeted therapeutic delivery system of claim 25, wherein said genetic material is deoxyribonucleic acid. 27. The targeted therapeutic delivery system of claim 25, wherein said genetic material is ribonucleic acid. 28. The targeted therapeutic delivery system of claim 25, comprising an antisense ribonucleic acid or an antisense deoxyribonucleic acid. 29. The targeted therapeutic delivery system of claim 25, wherein said microsphere further comprises a cationic lipid material. 30. The targeted therapeutic delivery system of claim 29, wherein the cationic lipid comprises N-[1-(2,3-dioleoyloxy)propyl]-N,N,N-trimethylammonium chloride. 31. The targeted therapeutic delivery system of claim 1, comprising a lipid selected from the group consisting of distearoylphosphatidylcholine, dipalmitoylphosphatidylcholine, and egg phosphatidylcholine. 32. The targeted therapeutic delivery system of claim 1, wherein said lipid microspheres comprise gas-or temperature activated gaseous precursor-filled liposomes. 33. The targeted therapeutic delivery system of claim 25, wherein the therapeutic compound comprises a deoxyribonucleic acid encoding at least a portion of a gene selected from the group consisting of a human major histocompatibility gene, dystrophin, Cystic Fibrosis transmembrane conductance regulator, Interleukin-2 and Tumor Necrosis Factor. 34. The targeted therapeutic delivery system of claim 25, wherein the therapeutic compound comprises an antisense oligonucleotide capable of binding at least a portion of a deoxyribonucleotide encoding Ras. 35. The targeted therapeutic delivery system of claim 1, wherein the therapeutic comprises a monoclonal antibody. 36. The targeted therapeutic delivery system of claim 35, wherein the monoclonal antibody is capable of binding to melanoma antigen. 37. The targeted therapeutic delivery system of claim 1, wherein said therapeutic compound is selected from the group consisting of cardiac glycosides, enzymes, peptides, circulatory drugs, antianginals, antinflammatories, and anticoagulants. 38. The targeted therapeutic delivery system of claim 1, wherein said lipid microspheres comprise gas-filled liposomes substantially devoid of water in the interior thereof and having embedded therein a therapeutic compound. 39. The targeted therapeutic delivery system of claim 1, wherein said lipid microspheres comprise gas-filled liposomes prepared by a vacuum drying gas instillation method and have embedded therein a therapeutic compound. 40. The targeted therapeutic delivery system of claim 1 wherein said lipid microspheres comprise gaseous precursor-filled liposomes prepared by a gel state shaking gaseous precursor instillation method.
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