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. An I domain of the α L subunit of human lymphocyte function-associated antigen-1, comprising the sequence of 130-310 amino acids of SEQ ID NO: 1, with triple mutations of F265S, F292G, and G311C.
2. A Chimeric antigen receptor (CAR) comprising from N-terminus to C-terminus:
(i) the I domain of claim 1 ,
(ii) a transmembrane domain,
(iii) at least one co-stimulatory domains, and
(iv) an activating domain.
3. The CAR according to claim 2 , wherein the co-stimulatory domain is selected from the group consisting of CD28, 4-1BB, ICOS-1, CD27, OX-40, GITR, and DAP10.
4. The CAR according to claim 3 , wherein the co-stimulatory domain comprises CD28 and 4-1BB.
5. The CAR according to claim 2 , wherein the activating domain is CD3 zeta.
6. An isolated nucleic acid encoding the CAR of claim 2 .
7. T cells or natural killer cells modified to express the CAR of claim 2 .