Compositions and methods of chimeric autoantibody receptor T cells
The invention includes compositions comprising at least one chimeric autoantibody receptor (CAAR) specific for an autoantibody, vectors comprising the same, compositions comprising CAAR vectors packaged in viral particles, and recombinant T cells comprising the CAAR. The invention also includes methods of making a genetically modified T cell expressing a CAAR (CAART) wherein the expressed CAAR comprises a desmoglein extracellular domain.
1. A genetically modified cell comprising a chimeric autoantibody receptor (CAAR) comprising an extracellular domain comprising Dsg1, Dsg3, or a fragment thereof that binds an autoantibody expressed on a B-cell, a transmembrane domain, and an intracellular signaling domain, wherein the cell expresses the CAAR and binds the autoantibody expressed on the B cell or induces killing of the B cell expressing the autoantibody.
2. The cell of claim 1 , wherein the cell ahs low affinity for an antibody bound to a Fc receptor or limited toxicity toward a healthy cell.
3. The cell of claim 1 , wherein the cell is selected from the group consisting of a helper T cell, a cytotoxic T cell, a memory T cell, a regulatory T cell, a gamma delta T cell, a natural killer cell, a cytokine induced killer cell, and a cell line thereof.
4. The cell of claim 1 , wherein the extracellular domain comprises Dsg3 or a fragment thereof and optionally comprises an amino acid sequence selected from the group consisting of SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, SEQ ID NO:10, SEQ ID NO:11, and SEQ ID NO:12, or an amino acid sequence encoded by the nucleotide sequence of SEQ ID NO:36.
5. The cell of claim 1 , wherein the CAAR further comprises a CD8 alpha chain signal peptide.
6. The cell of claim 5 , wherein the CD8 alpha chain signal peptide comprises the amino acid sequence of SEQ ID NO:1.
7. The cell of claim 1 , wherein the extracellular domain comprises Dsg3 or a fragment thereof and the CAAR further comprises a propeptide of Dsg3.
8. The cell of claim 7 , wherein the propeptide of Dsg3 comprises the amino acid sequence of SEQ ID NO:2.
9. The cell of claim 1 , wherein the transmembrane domain comprises a CD8 alpha chain hinge and transmembrane domain.
10. The cell of claim 9 , wherein the CD8 alpha chain hinge and transmembrane domain comprises the amino acid sequence of SEQ ID NO:13.
11. The cell of claim 1 , wherein the CAAR further comprises a peptide linker.
12. The cell of claim 11 , wherein the peptide linker comprises the amino acid sequence of SEQ ID NO:14.
13. The cell of claim 1 , wherein the intracellular signaling domain comprises a CD137 intracellular domain.
14. The cell of claim 13 , wherein the CD137 intracellular domain comprises the amino acid sequence of SEQ ID NO:15.
15. The cell of claim 1 , wherein the intracellular signaling domain comprises a CD3 zeta signaling domain.
16. The cell of claim 15 , wherein the CD3 zeta signaling domain comprises the amino acid sequence of SEQ ID NO:16.