Lipid-nucleic acid particles prepared via a hydrophobic lipid-nucleic acid complex intermediate and use for gene transfer
First Claim
Patent Images
1. A method for the preparation of lipid-nucleic acid particles, comprising:
- (a) contacting nucleic acids with a solution comprising non-cationic lipids and a detergent to form a nucleic acid-lipid mixture;
(b) contacting cationic lipids with said nucleic acid-lipid mixture to neutralize the negative charge of said nucleic acids and form a charge-neutralized mixture comprising detergent, nucleic acids and lipids; and
(c) removing said detergent from said charge-neutralized mixture to provide said lipid-nucleic acid particles in which said nucleic acids are protected from degradation.
5 Assignments
0 Petitions
Accused Products
Abstract
Novel lipid-nucleic acid particulate complexes which are useful for in vitro or in vivo gene transfer are described. The particles can be formed using either detergent dialysis methods or methods which utilize organic solvents. Upon removal of a solubilizing component (i.e., detergent or an organic solvent) the lipid-nucleic acid complexes form particles wherein the nucleic acid is serum-stable and is protected from degradation. The particles thus formed have access to extravascular sites and target cell populations and are suitable for the therapeutic delivery of nucleic acids.
-
Citations
29 Claims
-
1. A method for the preparation of lipid-nucleic acid particles, comprising:
-
(a) contacting nucleic acids with a solution comprising non-cationic lipids and a detergent to form a nucleic acid-lipid mixture; (b) contacting cationic lipids with said nucleic acid-lipid mixture to neutralize the negative charge of said nucleic acids and form a charge-neutralized mixture comprising detergent, nucleic acids and lipids; and (c) removing said detergent from said charge-neutralized mixture to provide said lipid-nucleic acid particles in which said nucleic acids are protected from degradation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method for the preparation of lipid-nucleic acid particles, comprising:
-
(a) contacting an amount of cationic lipids with nucleic acids in a solution;
said solution comprising of from about 15-35% water and about 65-85% organic solvent and said amount of cationic lipids being sufficient to produce a +/- charge ratio of from about 0.85 to about 2.0, to provide a hydrophobic, charge-neutralized lipid-nucleic acid complex;(b) contacting said hydrophobic lipid-nucleic acid complex in solution with non-cationic lipids, to provide a lipid-nucleic acid mixture; and (c) removing said organic solvents from said mixture to provide said lipid-nucleic acid particles in which said nucleic acids are protected from degradation. - View Dependent Claims (9, 10, 11, 12, 13)
-
-
14. The method for the preparation of serum-stable plasmid-lipid particles, comprising:
-
(a) combining a plasmid with cationic lipids in a detergent solution to provide a coated plasmid-lipid complex; (b) contacting non-cationic lipids with said coated plasmid-lipicl complex to provide a solution comprising detergent, a plasmid-lipid complex and non-cationic lipids; and (c) removing said detergent from said solution of step (b) to provide a solution of serum-stable plasmid-lipid particles, wherein said plasmid is encapsulated in a lipid bilayer and said particles are serum-stable and have a size of from about 50 to about 150 nm. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
-
-
24. A method for the preparation of serum-stable plasmid-lipid particles, comprising;
-
(a) preparing a mixture comprising cationic lipids and non-cationic lipids in an organic solvent; (b) contacting an aqueous solution of plasmid with said mixture prepared in step (a) to provide a clear single phase; and (c) removing said organic solvent to provide a suspension of plasmid-lipid particles, wherein said plasmid is encapsulated in a lipid bilayer, and said particles are stable in serum and have a size of from about 50 to about 150 nm. - View Dependent Claims (25, 26, 27, 28, 29)
-
Specification