Bilayer stabilizing components and their use in forming programmable fusogenic liposomes
First Claim
1. A fusogenic liposome comprising:
- a lipid capable of adopting a non-lamellar phase, yet capable of assuming a bilayer structure in the presence of a polyethyleneglycol-ceramide conjugate, wherein said lipid is a member selected from the group consisting of phosphatidylenthanolamines, phosphatidylserines, ceramides, glycolipids and mixtures thereof; and
a polyethyleneglycol-ceramide conjugate reversibly associated with said lipid to stabilize said lipid in a bilayer structure, wherein said polyethyleneglycol-ceramide conjugate is present at a concentration ranging from about 0.05 mole percent to about 50 mole percent.
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Abstract
The present invention provides a fusogenic liposome comprising a lipid capable of adopting a non-lamellar phase, yet capable of assuming a bilayer structure in the presence of a bilayer stabilizing component; and a bilayer stabilizing component reversibly associated with the lipid to stabilize the lipid in a bilayer structure. Such fusogenic liposomes are extremely advantageous because the rate at which they become fusogenic can be not only predetermined, but varied as required over a time scale ranging from minutes to days. Control of liposome fusion can be achieved by modulating the chemical stability and/or exchangeability of the bilayer stabilizing component(s). The fusogenic liposomes of the present invention can be used to deliver drugs, peptide, proteins, RNA, DNA or other bioactive molecules to the target cells of interest.
284 Citations
31 Claims
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1. A fusogenic liposome comprising:
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a lipid capable of adopting a non-lamellar phase, yet capable of assuming a bilayer structure in the presence of a polyethyleneglycol-ceramide conjugate, wherein said lipid is a member selected from the group consisting of phosphatidylenthanolamines, phosphatidylserines, ceramides, glycolipids and mixtures thereof; and a polyethyleneglycol-ceramide conjugate reversibly associated with said lipid to stabilize said lipid in a bilayer structure, wherein said polyethyleneglycol-ceramide conjugate is present at a concentration ranging from about 0.05 mole percent to about 50 mole percent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for delivering a therapeutic compound to a target cell at a predetermined rate, comprising;
administering to a host containing said target cell a fusogenic liposome which comprises a polyethyleneglycol-ceramide conjugate, a lipid capable of adopting a non-lamellar phase, yet capable of assuming a bilayer structure in the presence of said polyethyleneglycol-ceramide conjugate and said therapeutic compound or a pharmaceutically acceptable salt thereof, wherein said lipid is a member selected from the group consisting of phosphatidylenthanolamines, phosphatidylserines, ceramides, glycolipids and mixtures thereof, and wherein said polyethyleneglycol-ceramide conjugate is present at a concentration ranging from about 0.05 male percent to about 50 mole percent. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method of stabilizing in a bilayer structure a lipid which is capable of adopting a non-lamellar phase, said method comprising:
- combining a polyethylene glycol-ceramide conjugate with a lipid which is capable of adopting a non-lamellar phase, yet which is capable of assuming a bilayer structure in the presence of said polyethylene glycol-ceramide conjugate, said polyethylene glycol-ceramide conjugate being selected to be exchangeable or biodegradable such that over a predetermined period of time, said polyethylene glycol-ceramide conjugate is lost from said bilayer structure or modified, thereby rendering said bilayer structure fusogenic wherein said lipid is a member selected from the group consisting of phosphatidylenthanolamines, phosphatidylserines, ceramides, glycolipids and mixtures thereof, and wherein said polyethyleneglycol-ceramide conjugate is present at a concentration ranging from about 0.5 mole percent to about 50 mole percent.
- View Dependent Claims (28, 29, 30, 31)
Specification