Artificial immune system: methods for making and use
The present invention relates to methods of constructing an integrated artificial immune system that comprises appropriate in vitro cellular and tissue constructs or their equivalents to mimic the normal tissues that interact with vaccines in mammals. The artificial immune system can be used to test the efficacy of vaccine candidates in vitro and thus, is useful to accelerate vaccine development and testing drug and chemical interaction with the immune system.
1. A method of producing a biomolecule using an in vitro two culture cellular system, comprising:
a) adding an exogenous antigen of interest to a vaccination site (VS) culture, wherein the VS culture comprises a first substantially planar matrix, a plurality of cells consisting of endothelial cells and/or epithelial cells attached to said first matrix and a population of peripheral blood mononuclear cells (PBMCs);
b) culturing the VS culture of a) in the presence of the antigen for a duration of time sufficient to mature dendritic cell precursors present in the population of PBMCs;
c) transferring dendritic cells matured in the VS culture of b) to a three-dimensional artificial lymphoid tissue equivalent (LTE) culture, wherein the LTE culture comprises a second matrix and a plurality of lymphocytes attached to said second matrix;
d) culturing the LTE culture of c) for a duration of time sufficient for lymphocyte activation; and
e) harvesting a biomolecule produced by the activated lymphocytes, wherein said biomolecule is selected from the group consisting of cytokines, proteins and antibodies.
2. The method of claim 1 , wherein said biomolecule is an antibody.
3. The method of claim 1 , wherein said plurality of cells forms a vascular endothelium on one side of said first matrix.
4. The method of claim 1 , wherein said plurality of cells forms a vascular endothelium on both sides of said first matrix.
5. The method of claim 1 , wherein said plurality of cells forms a vascular endothelium on one side of said first matrix and an epithelium on an opposing side of said first matrix.
6. The method of claim 1 , wherein said plurality of cells forms a vascular endothelium on one side of said first matrix and a lymphatic endothelium on an opposing side of said first matrix.
7. The method of claim 1 , wherein said first matrix comprises a natural biopolymer.
8. The method of claim 7 , wherein said biopolymer is selected from the group consisting of type I rat tail collagen, bovine type I collagen, and chitosan.
9. The method of claim 1 , wherein said first matrix comprises bovine type I collagen matrix deposited and congealed on a nylon mesh.
10. The method of claim 1 , wherein said first matrix is selected from the group consisting of a xenographic extracellular matrix (ECM) sheet, natively polymerized human amniotic connective tissue, reconstituted collagen matrix, and chitosan/collagen membrane scaffolds.
11. The method of claim 1 , wherein said plurality of cells attached to said first matrix comprises human cells.
12. The method of claim 11 , wherein said human cells comprise human vascular endothelial cells (HUVECs).
13. The method of claim 1 , wherein said plurality of cells attached to said first matrix consists of endothelial and/or epithelial cells derived from embryonic stem cells.
14. The method of claim 1 , wherein said endothelial cells are human skin-derived vascular endothelial cells or said endothelial cells are vascular and lymphatic endothelial cells.
15. The method of claim 1 , wherein said plurality of lymphocytes comprises T cells and B cells.
16. The method of claim 15 , wherein said plurality of lymphocytes further comprises dendritic cells.
17. The method of claim 1 , wherein said plurality of lymphocytes comprises naive T cells and naive B cells.
18. The method of claim 1 , wherein said plurality of lymphocytes comprises memory T cells and memory B cells.
19. The method of claim 1 , wherein said plurality of lymphocytes further comprises lymphoid stromal cells.
20. The method of claim 19 , wherein said lymphoid stromal cells are derived from lymph node fragments, lymph node, spleen, or tonsil.
21. The method of claim 1 , wherein said plurality of lymphocytes comprises B cells and T cells negatively selected from peripheral blood lymphocytes.
22. The method of claim 1 , wherein said plurality of lymphocytes attached to said second matrix comprises cells derived from embryonic stem cells.
23. The method of claim 1 , wherein said second matrix comprises natural or synthetic ECM materials.
24. The method of claim 1 , wherein said second matrix comprises natural or synthetic lymphoid ECM-derived hydrogel.
25. The method of claim 1 , wherein said second matrix comprises synthetic ordered macroporous hydrogel, wherein said hydrogel comprises poly(ethylene glycol) (PEG) dimethacrylate, PEG peptide PEG block copolymers and ordered colloidal crystal of poly (methyl methacrylate) latex microspheres.
26. The method of claim 1 , wherein said second matrix comprises segregated T cell and B cell zones.
27. The method of claim 26 , wherein said T cell zone comprises naive T cells and collagen fibers.
28. The method of claim 27 , wherein said collagen fibers comprise collagen I, collagen III or fibronectin.
29. The method of claim 26 , wherein said segregated T cell and B cell zones are fabricated by combined action of digital printing and controlled release of chemoattractants.
30. The method of claim 26 , wherein said segregated T cell and B cell zones are fabricated by digital printing or said segregated T cell and B cell zones are fabricated by controlled release of chemoattractants.