Recombinant production of mixtures of antibodies
The invention provides methods for producing mixtures of antibodies from a single host cell clone, wherein, a nucleic acid sequence encoding a light chain and nucleic acid sequences encoding different heavy chains are expressed in a recombinant host cell. The recombinantly produced antibodies in the mixtures according to the invention suitably comprise identical light chains paired to different heavy chains capable of pairing to the light chain, thereby forming functional antigen-binding domains. Mixtures of the recombinantly produced antibodies are also provided by the invention. Such mixtures can be used in a variety of fields.
1. A method of producing a host cell, said method comprising:
introducing into a host cell at least one nucleic acid sequence encoding an immunoglobulin light chain and nucleic acid sequences encoding at least three different immunoglobulin heavy chains,
wherein said at least three different immunoglobulin heavy chains are capable of pairing with said immunoglobulin light chain to form functional antigen binding domains of three or more non-identical antibodies.
2. The method according to claim 1 , wherein said three or more non-identical antibodies have differing specificities for the same target antigen.
3. The method according to claim 1 , wherein said three or more non-identical antibodies have differing affinities for the same target epitope.
4. The method according to claim 1 , wherein said at least one nucleic acid sequence is present on a low copy number vector and said host cell produces 1 to 20 picograms per cell per day of said three or more non-identical antibodies.
5. The method according to claim 1 , wherein said host cell comprises a human embryonic retina cell, and wherein said host cell has been immortalized or transformed by adenoviral E1 nucleic acid sequences.
6. The method according to claim 1 , wherein said three or more non-identical antibodies are of different isotypes.
7. The method according to claim 6 , wherein said different isotypes comprise at least an IgG and an IgA.
8. The method according to claim 6 , wherein said different isotypes comprise at least an IgG1 and an IgG3 antibody.
9. The method according to claim 1 , wherein said three or more non-identical antibodies are independently selected from the group consisting of IgG1, IgG2, IgG3, IgG4, IgA1, IgA2, IgD, IgE and IgM.
10. The method according to claim 1 , wherein said at least three different immunoglobulin heavy chains are of IgM isotype.
11. The method according to claim 1 , wherein said at least three different immunoglobulin heavy chains are of an IgA isotype, and wherein at least two of said three or more non-identical antibodies form a dimeric IgA antibody, said dimeric IgA antibody having non-identical binding sites.
12. The method according to claim 1 , wherein said three or more non-identical antibodies bind to different epitopes of at least one target antigen.
13. The method according to claim 1 , wherein at least one of said at least one nucleic acid sequence is stably expressed in said host cell.
14. The method according to claim 1 , wherein said three or more non-identical antibodies are produced by said host cell in vitro.
15. The method according to claim 1 , wherein said at least three different immunoglobulin heavy chains differ in at least one constant region, said difference in at least one constant region reducing non-functional antibody chain pairing.
16. The method according to claim 1 , wherein said three or more non-identical antibodies comprise at least one bispecific antibody.
17. The method according to claim 1 , wherein said three or more non-identical antibodies bind to different antigens.
18. The method according to claim 1 , wherein said three or more non-identical antibodies bind synergistically to a target antigen.
19. The method according to claim 1 , wherein a first antibody of the three or more non-identical antibodies binds CD22, a second antibody of the three or more non-identical antibodies binds CD72, and a third antibody of the three or more non-identical antibodies binds HLA-DR.
20. The method according to claim 1 , wherein a first antibody of the three or more non-identical antibodies binds an EP-CAM homotypic adhesion molecule, and wherein a second antibody and a third antibody of the three or more non-identical antibodies each bind CD46.
21. The method according to claim 1 , wherein at least three of the three or more non-identical antibodies bind to non-overlapping epitopes on Her-2.
22. The method according to claim 1 , wherein the three or more non-identical antibodies bind to targets selected from the group consisting of a Her-2/Neu receptor, a VEGFR1 receptor, a VEGFR2 receptor, a B-cell marker, a T-cell marker, cytokines, interleukins, and cytokine receptors.
23. A method of producing a host cell, said method comprising:
providing a host cell comprising a nucleic acid sequence encoding an immunoglobulin light chain;
introducing nucleic acid sequences encoding at least three different immunoglobulin heavy chains into said host cell,
wherein said at least three different immunoglobulin heavy chains are capable of pairing with said immunoglobulin light chain to form functional antigen binding domains of the three or more non-identical antibodies.