N-acyl phosphatidylethanolamine-mediated liposomal drug delivery
First Claim
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1. A pharmaceutical composition comprising:
- (a) a pharmaceutically acceptable carrier; and
(b) a liposome having a lipid component which comprises;
(i) an N-acyl phosphatidylethanolamine (NAPE) having the formula;
(ii) an additional lipid,
wherein;
each of R1, R2 and R3 is independently a group having the formula —
C(O)(CH2)n1(CH═
CH)n2(CH2)n3(CH═
CH)n4(CH2)n5(CH═
CH)n6(CH2)n7(CH═
CH)n8(CH2)n9CH3;
n1 is zero or an integer equal to from 1 to 22;
n3 is zero or an integer equal to from 1 to 19;
n5 is zero or an integer equal to from 1 to 16;
n7 is zero or an integer equal to from 1 to 13;
n9 is zero or an integer equal to from 1 to 10;
for each of R1 and R2 independently the sum of n1+2n2+n3+2n4+n5+2n6+n7+2n8+n9 is an integer equal to from 12 to 22, at least one of n2, n4, n6 and n8 is equal to 1;
for R3 the sum of n1+2n2+n3+2n4+n5+2n6+n7+2n8+n9 is an integer equal to from 2 to 22;
each of n2, n4, n6 and n8 is independently equal to 0 or 1;
the lipid component comprises a destabilization-effective amount of the N-acyl phosphatidylethanolamine of at least about 25 mole %;
wherein the liposome is multilamellar or is a large unilamellar liposome wherein the destabilization-effective amount of the NAPE is that amount of NAPE which renders the liposome fusogenic when the liposome is admixed with a target, in the presence of divalent cations or at a pH of about 4.9 to about 6.0.
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Abstract
This invention provides liposomes containing one or more N-acylated phosphatidylethanolamines, such liposomes being useful for localizing the delivery of bioactive agents to cells.
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Citations
52 Claims
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1. A pharmaceutical composition comprising:
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(a) a pharmaceutically acceptable carrier; and
(b) a liposome having a lipid component which comprises;
(i) an N-acyl phosphatidylethanolamine (NAPE) having the formula;
(ii) an additional lipid,
wherein;
each of R1, R2 and R3 is independently a group having the formula —
C(O)(CH2)n1(CH═
CH)n2(CH2)n3(CH═
CH)n4(CH2)n5(CH═
CH)n6(CH2)n7(CH═
CH)n8(CH2)n9CH3;
n1 is zero or an integer equal to from 1 to 22;
n3 is zero or an integer equal to from 1 to 19;
n5 is zero or an integer equal to from 1 to 16;
n7 is zero or an integer equal to from 1 to 13;
n9 is zero or an integer equal to from 1 to 10;
for each of R1 and R2 independently the sum of n1+2n2+n3+2n4+n5+2n6+n7+2n8+n9 is an integer equal to from 12 to 22, at least one of n2, n4, n6 and n8 is equal to 1;
for R3 the sum of n1+2n2+n3+2n4+n5+2n6+n7+2n8+n9 is an integer equal to from 2 to 22;
each of n2, n4, n6 and n8 is independently equal to 0 or 1;
the lipid component comprises a destabilization-effective amount of the N-acyl phosphatidylethanolamine of at least about 25 mole %;
wherein the liposome is multilamellar or is a large unilamellar liposome wherein the destabilization-effective amount of the NAPE is that amount of NAPE which renders the liposome fusogenic when the liposome is admixed with a target, in the presence of divalent cations or at a pH of about 4.9 to about 6.0.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 23, 24, 25, 51, 52)
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21. A method of delivering a bioactive agent to a target which comprises contacting the target with a composition, wherein the composition comprises:
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(a) a liposome having a lipid component which comprises;
(i) an N-acyl phosphatidylethanolamine (NAPE) having the formula;
(ii) an additional lipid,
wherein;
each of R1, R2 and R3 is independently a group having the formula —
C(O)(CH2)n1(CH═
CH)n2(CH2)n3(CH═
CH)n4(CH2)n5(CH═
CH)n6(CH2)n7(CH═
CH)n8(CH2)n9CH3;
n1 is zero or an integer equal to from 1 to 22;
n3 is zero or an integer equal to from 1 to 19;
n5 is zero or an integer equal to from 1 to 16;
n7 is zero or an integer equal to from 1 to 13;
n9 is zero or an integer equal to from 1 to 10;
for each of R1 and R2 independently the sum of n1+2n2+n3+2n4+n5+2n6+n7+2n8+n9 is an integer equal to from 12 to 22, at least one of n2, n4, n6 and n8 is equal to 1;
for R3 the sum of n1+2n2+n3+2n4+n5+2n6+n7+2n8+n9 is an integer equal to from 2 to 22;
each of n2, n4, n6 and n8 is independently equal to 0 or 1;
the lipid component comprises a destabilization-effective amount of the N-acyl phosphatidylethanolamine of at least about 25 mole %; and
wherein the liposome is multilamellar or is a large unilamellar liposome.- View Dependent Claims (22, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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Specification