Compositions and methods for antigen targeting to CD180

1. An isolated nucleic acid encoding a fusion protein comprising:

(a) an antibody that selectively binds CD180 or an antigen binding fragment thereof; and

(b) a heterologous polypeptide antigen.

2. An expression vector comprising the isolated nucleic acid of claim 1 operatively linked to a promoter.

3. A recombinant host cell comprising the expression vector of claim 2 .

4. A pharmaceutical composition, comprising:

(a) the isolated nucleic acid of claim 1 ; and

(b) a pharmaceutically acceptable carrier.

5. The isolated nucleic acid of claim 1 , wherein the heterologous polypeptide antigen comprises a pathogen-specific polypeptide antigen, wherein the pathogen-specific polypeptide antigen comprises a polypeptide antigen of a pathogen selected from the group consisting of human papillomavirus, herpes simplex viruses, cytomegalovirus, Epstein-Barr virus, influenza virus, parainfluenza virus, enterovirus, measles virus, mumps virus, polio virus, rabies virus, human immunodeficiency virus, respiratory syncytial virus, Rotavirus, rubella virus, varicella zoster virus, Ebola virus, cytomegalovirus, Marburg virus, norovirus, variola virus, West Nile virus, yellow fever virus, dengue virus, tick-borne encephalitis virus, Japanese encephalitis virus, human immunodeficiency virus (HIV), Bacillus anthracis, Bordetalla pertusis, Chlamydia trachomatis, Clostridium tetani, Clastridium difficile, Corynebacterium diptheriae, Coxiella burnetii, Escherichia coli, Haemophilus influenza, Helicobacter pylori, Leishmania donovani, L. tropica and L. braziliensis, Mycobacterium tuberculosis, Mycobacterium leprae, Neisseria meningitis, Plasmodium falciparum, P. ovale, P. malariae and P. vivax, Pseudomonas aeruginosa, Salmonella typhi, Schistosoma hematobium, S. mansoni, Streptococcus pneumoniae (group A and B), Staphylococcus aureus, Toxoplasma gondii, Trypanosoma brucei, T. cruzi and Vibrio cholera.

6. The isolated nucleic acid of claim 1 , wherein the disease-related polypeptide antigen comprises an antigen expressed on a tumor cell surface.

7. The isolated nucleic acid of claim 1 , wherein the antibody or antibody fragment that binds CD180 is a CD180 monoclonal antibody or an antigen binding fragment thereof.

8. The isolated nucleic acid of claim 7 , wherein the CD180 monoclonal antibody or an antigen binding fragment thereof comprises a human or animal CD180 binding domain linked to an immunoglobulin constant region (Fc) domain that has impaired binding to human or animal Fc receptor FcγRIlb and/or to human or animal complement proteins.

9. The isolated nucleic acid of claim 1 , wherein the isolated nucleic acid comprises RNA.

10. The isolated nucleic acid of claim 5 , wherein the isolated nucleic acid comprises RNA.

11. The isolated nucleic acid of claim 6 , wherein the isolated nucleic acid comprises RNA.

12. The isolated nucleic acid of claim 7 , wherein the isolated nucleic acid comprises RNA.

13. The isolated nucleic acid of claim 8 , wherein the isolated nucleic acid comprises RNA.

14. A pharmaceutical composition, comprising:

(a) the isolated nucleic acid of claim 9 ; and

(b) a pharmaceutically acceptable carrier.

15. A pharmaceutical composition, comprising:

(a) the isolated nucleic acid of claim 10 ; and

(b) a pharmaceutically acceptable carrier.

16. A pharmaceutical composition, comprising:

(a) the isolated nucleic acid of claim 11 ; and

(b) a pharmaceutically acceptable carrier.

17. A pharmaceutical composition, comprising:

(a) the isolated nucleic acid of claim 12 ; and

(b) a pharmaceutically acceptable carrier.

18. A pharmaceutical composition, comprising:

(a) the isolated nucleic acid of claim 13 ; and

(b) a pharmaceutically acceptable carrier.

19. An expression vector comprising the isolated nucleic acid of claim 5 operatively linked to a promoter.

20. An expression vector comprising the isolated nucleic acid of claim 7 operatively linked to a promoter.