Liposome composition for delivery of nucleic acid
First Claim
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1. A composition for administration of a nucleic acid, comprising:
- (a) liposomes comprised of (i) a lipid having the formula where each of R1 and R2 is an alkyl or alkenyl chain having between 8-24 carbon atoms, and each of R1 or R2 are independently selected;
n=0-20;
L is selected from the group consisting of (1) —
X—
(C═
O)—
Y—
[[CH2—
]], (2) —
X—
(C═
O)—
, and (3) —
X—
[[CH2—
]], where X and Y are independently selected from oxygen, NH and a direct bond;
Z is a weakly basic moiety that has a pk of less than 7.4 and greater than about 4.0; and
(ii) a compound having the general structure;
wherein R3 is a hydrophilic polymer comprising a linkage for attachment to the dithiobenzyl moiety;
R4 is selected from the group consisting of H, alkyl and aryl;
R5 is selected from the group consisting of O(C═
O)R7, S(C═
O)R7, and O(C═
S)R7;
R7 comprises an amine-containing lipid; and
R6 is selected from the group consisting of H, alkyl and aryl; and
where orientation of CH2—
R5 is selected from the ortho position and the para position; and
(b) a nucleic acid associated with said liposomes.
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Abstract
A liposome composition for delivery of a nucleic acid in vivo or ex vivo is described. The liposomes in the composition are comprised of (i) a lipid that is neutral in charge at physiologic pH and positively charged at pH values less than physiologic pH and (ii) a lipid joined to a hydrophilic polymer by a dithiobenzyl linkage. The liposomes are associated with a nucleic acid for delivery to a cell.
48 Citations
26 Claims
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1. A composition for administration of a nucleic acid, comprising:
-
(a) liposomes comprised of (i) a lipid having the formula where each of R1 and R2 is an alkyl or alkenyl chain having between 8-24 carbon atoms, and each of R1 or R2 are independently selected;
n=0-20;
L is selected from the group consisting of (1) —
X—
(C═
O)—
Y—
[[CH2—
]], (2) —
X—
(C═
O)—
, and (3) —
X—
[[CH2—
]], where X and Y are independently selected from oxygen, NH and a direct bond;
Z is a weakly basic moiety that has a pk of less than 7.4 and greater than about 4.0; and
(ii) a compound having the general structure;
wherein R3 is a hydrophilic polymer comprising a linkage for attachment to the dithiobenzyl moiety;
R4 is selected from the group consisting of H, alkyl and aryl;
R5 is selected from the group consisting of O(C═
O)R7, S(C═
O)R7, and O(C═
S)R7;
R7 comprises an amine-containing lipid; and
R6 is selected from the group consisting of H, alkyl and aryl; and
where orientation of CH2—
R5 is selected from the ortho position and the para position; and
(b) a nucleic acid associated with said liposomes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification