CD229 Car T Cells And Methods Of Use Thereof

Abstract

Disclosed are chimeric antigen receptor (CAR) polypeptides comprising a CD229 antigen binding domain, a transmembrane domain, and an intracellular signaling domain. Disclosed are nucleic acid sequences capable of encoding a CAR polypeptide comprising a CD229 antigen binding domain, a transmembrane domain, and an intracellular signaling domain. Also disclosed are vectors and cells comprising one or both of the CAR polypeptides and nucleic acid sequences capable of encoding CAR polypeptides. Also disclosed are methods of treating.

1 . A chimeric antigen receptor (CAR) polypeptide, comprising a CD229 antigen binding domain, a transmembrane domain, and an intracellular signaling domain. 
     
     
         2 . The CAR polypeptide of  claim 1 , wherein the intracellular signaling domain comprises a co-stimulatory signaling region. 
     
     
         3 . The CAR polypeptide of  claim 2 , wherein the co-stimulatory signaling region comprises the cytoplasmic domain of a costimulatory molecule selected from the group consisting of CD27, CD28, 4-1BB, OX40, CD30, CD40, PD-1, ICOS, lymphocyte function-associated antigen-1 (LFA-1), CD2, CD7, LIGHT, NKG2C, B7-H3, a ligand that specifically binds with CD83, and any combination thereof. 
     
     
         4 . The CAR polypeptide of  claim 1 , wherein the intracellular signaling domain is a T cell signaling domain. 
     
     
         5 . The CAR polypeptide of  claim 1 , wherein the intracellular signaling domain comprises a CD3 zeta (CD3ζ) signaling domain. 
     
     
         6 . The CAR polypeptide of  claim 1 , wherein the intracellular signaling domain comprises a CD3ζ signaling domain and a co-stimulatory signaling region, wherein the co-stimulatory signaling region comprises the cytoplasmic domain of CD28 or 4-1BB. 
     
     
         7 . The CAR polypeptide of  claim 1 , wherein the CD229 antigen binding domain is an antibody fragment or an antigen-binding fragment that specifically binds to CD229. 
     
     
         8 . The CAR polypeptide of  claim 6 , wherein the CD229 antigen binding domain is a Fab or a single-chain variable fragment (scFv) of an antibody that specifically binds CD229. 
     
     
         9 . The CAR polypeptide of  claim 1 , wherein the CD229 antigen binding domain comprises an amino acid sequence set forth in SEQ ID NO:1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15. 
     
     
         10 . The CAR polypeptide of  claim 1 , wherein the CD229 antigen binding domain comprises a variable heavy chain comprising a sequence having at least 90% identity a sequence set forth in SEQ ID NOs:16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30. 
     
     
         11 . The CAR polypeptide of  claim 1 , wherein the CD229 antigen binding domain comprises a variable light chain comprising a sequence having at least 90% identity a sequence set forth in SEQ ID NOs:31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, or 45. 
     
     
         12 . The CAR polypeptide of  claim 1 , wherein the CD229 antigen binding domain comprises a heavy chain immunoglobulin variable region comprising:
 a. a complementarity determining region 1 (CDR1) comprising the sequence of SEQ ID NO:46, 49, 52, 57, 60, 63, 66, 69, 71, 74, 77, 80, 83 or 86;   b. a CDR2 comprising the sequence of SEQ ID NO:47, 50, 53, 55, 58, 61, 64, 67, 70, 72, 75, 78, 81, 84, or 87; and   c. a CDR3 comprising the sequence of SEQ ID NO:48, 51, 54, 56, 59, 62, 65, 68, 71, 73, 76, 79, 82, 85, or 88.   
     
     
         13 . The CAR polypeptide of  claim 1 , wherein the CD229 antigen binding domain comprises a light chain immunoglobulin variable region comprising:
 a. a complementarity determining region 1 (CDR1) comprising the sequence of SEQ ID NO:89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, or 117;   b. a CDR2 comprising the sequence of DAS, DVS, GGS, EDN, AAS, DDD, or AAS; and   c. a CDR3 comprising the sequence of SEQ ID NO:90, 92, 94, 96, 98, 100, 102, 104, 106, 108, 110, 112, 114, 116, or 118.   
     
     
         14 . The CAR polypeptide of  claim 1 , wherein the transmembrane domain comprises an immunoglobulin Fc domain. 
     
     
         15 . (canceled) 
     
     
         16 . The CAR polypeptide of  claim 1 , wherein the transmembrane domain comprises a CD8α domain, CD3ζ, FcεR1γ, CD4, CD7, CD28, OX40, or H2-Kb. 
     
     
         17 .- 22 . (canceled) 
     
     
         23 . A nucleic acid sequence capable of encoding the CAR polypeptide of  claim 1 . 
     
     
         24 .- 33 . (canceled) 
     
     
         34 . A T cell expressing the CAR polypeptide of  claim 1 . 
     
     
         35 . (canceled) 
     
     
         36 . (canceled) 
     
     
         37 . An antibody or fragment thereof that binds to human CD229, wherein said antibody comprises a variable heavy chain comprising a sequence having at least 90% identity to a sequence set forth in SEQ ID NOs:16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 and/or a variable light chain comprising a sequence having at least 90% identity to a sequence set forth in SEQ ID NOs:31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, or 45. 
     
     
         38 .- 46 . (canceled) 
     
     
         47 . A method of treating multiple myeloma comprising administering an effective amount of a T cell genetically modified to express the CAR polypeptide of  claim 1  to a subject in need thereof. 
     
     
         48 .- 52 . (canceled) 
     
     
         53 . A method of killing CD229 positive cells comprising administering an effective amount of a T cell genetically modified to express the CAR polypeptide of  claim 1  to a sample comprising CD229 positive cells. 
     
     
         54 .- 57 . (canceled)