I domain chimeric antigen receptor specific to ICAM-1
The present invention relates to chimeric antigen receptors (CARs) specific to ICAM-1 comprising I domain of the α L subunit of human lymphocyte function-associated antigen 1 (LFA-1). The invention particularly relates to CARs comprising human I domains having different affinities (1 mM to 1 nM Kd) to ICAM-1. CAR T cells comprising human I domain having a low affinity (1 to 200 μM Kd) to ICAM-1 can avoid targeting healthy tissues with basal ICAM-1 expression while simultaneously exhibiting increased potency and long-term efficacy against tumor tissues with high ICAM-1 expression. The present invention also relates to an adoptive cell therapy method for treating cancer by administering the CAR-T cells comprising human I domain to a subject suffering from cancer, whereby the CAR T cells bind to the cancer cells overexpressing ICAM-1 and kill the cancer cells.
1. A Chimeric antigen receptor (CAR) comprising from N-terminus to C-terminus:
(i) an I domain of the αL subunit of human lymphocyte function-associated antigen-1, wherein the I domain is a wild-type I domain consisting of the sequence of 130-310 amino acids of SEQ ID NO: 1, or a mutant thereof having 1 to 3 amino acid mutations at the amino acid residue A 265, 288, 289, 292, 295, or 309 of,
(ii) a transmembrane domain,
(iii) at least one co-stimulatory domains, and
(iv) an activating domain.
2. The CAR of claim 1 , wherein the I domain is a mutant having one B mutation of I288N, I309T, L295A, F292A, F292S, L289G, F292G, or F265S.
3. The CAR of claim 2 , wherein the mutant has a mutation of F292G.
4. The CAR of claim 1 , wherein the I domain is a mutant having two mutations of F265S and F292G.
5. The CAR according to claim 1 , wherein the at least one co-stimulatory domains are selected from the group consisting of CD28, 4-1BB, ICOS-1, CD27, OX-40, GITR, and DAP10.
6. The CAR according to claim 5 , wherein the co-stimulatory domain comprises CD28 and 4-1BB.
7. The CAR according to claim 1 , wherein the activating domain is CD3 zeta.
8. An isolated nucleic acid encoding the CAR of claim 1 .
9. The isolated nucleic acid of claim 8 , further comprising human somatostatin receptor 2 (SSTR2).
10. T cells or natural killer cells modified to express the CAR of claim 1 .
11. The T cells or natural killer cells of claim 10 , further expressing SSTR2.