METHODS FOR STABILIZING INFLUENZA ANTIGEN ENVELOPED VIRUS-BASED VIRUS-LIKE PARTICLE SOLUTIONS
Methods of stabilizing solutions with enveloped vims-based virus-like particles containing an influenza antigen and such stabilized solutions are described.
1 . A method for stabilizing a solution containing an influenza antigen enveloped virus-based virus-like particle preparation comprising:
(a) providing the solution containing the influenza antigen enveloped virus-based virus-like particle; and
(b) (1) adding a stabilizing amount of a stabilizing agent selected from a monosaccharide, sorbitol, a disaccharide, trehalose, diethanolamine, glycerol, glycine, and a combination of the preceding stabilizing agents to influenza antigen enveloped virus-based virus-like particle preparation, (2) buffering the solution so that the pH is between about pH 6.5 and about pH 8.0, between about pH 6.5 and about pH 7.5, or about pH 7, or (3) both steps (1) and (2),
wherein the influenza antigen enveloped virus-based virus-like particle preparation after step (b) exhibits at least one of the following characteristics (i) reduced aggregation of the virus-like particles as compared to the influenza antigen enveloped virus-based virus-like particle preparation before step (b) as measured by optical density, (ii) stabilized influenza antigen as compared to the influenza antigen enveloped virus-based virus-like particle preparation before step (b) as measured by circular dichroism or ANS binding, and (iii) reduced temperature induced hydration of the lipid bilayer of the virus-like particle as compared to the influenza antigen enveloped virus-based virus-like particle preparation before step (b) as measured by laurdan fluorescence.
2 . The method of claim 1 , wherein the buffering is performed using a buffering agent selected from the group consisting of phosphate, Tris, MES, citrate and other GRAS buffers.
3 . The method of claim 1 , wherein the stabilizing agent is selected from trehalose, sorbitol, diethanolamine, glycerol, glycine and a combination of the preceding stabilizing agents and the characteristic is (i).
4 . The method of claim 1 , wherein the stabilizing agent is selected from trehalose, sorbitol, and a combination of the preceding stabilizing agents and the characteristic is (ii).
5 . The method of claim 1 , wherein the stabilizing agent is selected from trehalose and glycine and the characteristic is (iii).
6 . The method of claim 1 , wherein the stabilizing agent is trehalose and all three characteristics are present.
7 . The method of claim 1 , wherein the influenza antigen enveloped virus-based virus-like particle comprises a hemagglutinin polypeptide.
8 . The method of claim 1 , wherein the influenza antigen enveloped virus-based virus-like particle comprises a second polypeptide selected from the group comprising a gag polypeptide, an influenza M1 polypeptide, a Newcastle disease virus matrix polypeptide, an Ebola virus VP40 polypeptide and a Marburg virus VP40 polypeptide.
9 . The method of claim 8 , wherein said gag polypeptide is from a retrovirus selected from the group consisting of: murine leukemia virus, human immunodeficiency virus, Alpharetroviruses, Betaretroviruses, Gammaretroviruses, Deltaretroviruses and Lentiviruses.
10 . The method of claim 8 , wherein said gag polypeptide is from a murine leukemia virus.
11 . The method of claim 1 , wherein the influenza antigen enveloped virus-based virus-like particle further comprises a neuraminidase polypeptide.
12 . The method of claim 1 , wherein the stabilizing agent is selected from monosaccharide, sorbitol, a disaccharide, and trehalose, and the stabilizing amount is greater than 10% (w/w) or at least about 20% (w/w).
13 . The method of claim 1 , wherein the stabilizing does not require glass formation.
14 . The method of claim 1 , wherein the stabilizing amount is less that the amount required for glass formation upon freezing.
15 . The method of claim 1 , wherein the stabilizing agent is not sucrose.
16 . The method of claim 1 , wherein the influenza antigen enveloped virus-based virus-like particle preparation further comprises an adjuvant in admixture with the influenza antigen enveloped virus-based virus-like particle.
17 - 21 . (canceled)
22 . The method claim 1 , further comprising (c) storing the solution in liquid form for a period of time of at least two weeks, at least one month, at least two months, at least three months, at least four months, at least six months, or at least one year, wherein the influenza antigen enveloped virus-based virus-like particle preparation after such time period induces at least eighty percent, at least ninety percent, or at least ninety five percent of the immune response induced by the influenza antigen enveloped virus-based virus-like particle preparation before such time period.
23 . An influenza antigen enveloped virus-based virus-like particle preparation comprising influenza antigen enveloped virus-based virus-like particles and a stabilizing amount of a stabilizing agent selected from trehalose, sorbitol, diethanolamine, glycerol, glycine, and a combination of the preceding stabilizing agents to influenza antigen enveloped virus-based virus-like particle preparation, wherein the influenza antigen enveloped virus-based virus-like particle preparation exhibits at least one of the following characteristics (i) reduced aggregation of the virus-like particles as compared to a influenza antigen enveloped virus-based virus-like particle preparation without the stabilizing agent as measured by optical density, (ii) stabilized influenza antigen as compared to the influenza antigen enveloped virus-based virus-like particle preparation without the stabilizing agent as measured by circular dichroism or ANS binding, and (iii) reduced temperature induced hydration of the lipid bilayer of the virus-like particle as compared to the influenza antigen enveloped virus-based virus-like particle preparation without the stabilizing agent as measured by laurdan fluorescence.
24 - 43 . (canceled)
44 . A method for treating or preventing influenza comprising administering to a subject an immunogenic amount of a solution containing an immunogenic amount of an influenza antigen enveloped virus-based virus-like particle preparation stabilized in accordance with claim 1 .
45 . The method of claim 44 , wherein the administering induces a protective immunization response in the subject.
46 . (canceled)