Humanized antibody against o-acetylated gd2 ganglioside (oacgd2)

Abstract

Disclosed is an antibody, functional fragment, and derivative thereof, which binds specifically to the OAcGD2 ganglioside, the antibody including i) a humanized light chain variable region (VL) polypeptide having the amino acid sequence SEQ id n°112; and ii) a humanized heavy chain variable region (VH) having the amino acid sequence SEQ id n°76; and its use in diagnostics and therapy.

1 . An antibody, functional fragment, and derivative thereof, which binds specifically to the O-acetylated GD2 (OAcGD2) ganglioside, said antibody comprising:
 a) a humanized light chain variable region (VL) polypeptide having the amino acid sequence SEQ id n°112; and   b) a humanized heavy chain variable region (VH) having the amino acid sequence SEQ id n°76.   
     
     
         2 . The antibody of  claim 1 , wherein said antibody, functional fragment or derivative thereof comprises:
 the light chain variable region (VL) having the amino acid sequence selected in the group comprising VL30BH (SEQ id n°134) and VL28Bs01/A2 (SEQ id n°135), and/or   the heavy chain variable region (VH) having the amino acid sequence selected in the group comprising VH72Bmax (SEQ id n°131), VH49B (SEQ id n°132), and VH49Bmax (SEQ id n°133).   
     
     
         3 . The antibody of  claim 1 , wherein said antibody, functional fragment or derivative thereof comprises:
 the light chain variable region (VL) having the amino acid sequence selected in the group comprising VL1 (SEQ id n°8), VL2 (SEQ id n°9), VL3 (SEQ id n°10), VL4 (SEQ id n°11), VL28BH (SEQ id n°140), VL30BH (SEQ id n°134) and VL28Bs01/A2 (SEQ id n°135), and/or   the heavy chain variable region (VH) having the amino acid sequence selected in the group comprising VH1 (SEQ id n°3), VH2 (SEQ id n°4), and VH3 (SEQ id n°5), VH72BCDR (SEQ id n°136), VH72BH (SEQ id n°137), VH49BCDR (SEQ id n°138), VH49BH (SEQ id n°139), VH72Bmax (SEQ id n°131), VH49B (SEQ id n°132), and VH49Bmax (SEQ id n°133).   
     
     
         4 . The antibody of  claim 1 , wherein said antibody, functional fragment or derivative thereof, which binds specifically to the OAcGD2 ganglioside presents a K d  of less than 5 x 10 -6  M for said ganglioside at 25° C. 
     
     
         5 . The antibody of  claim 1 , wherein said antibody, functional fragment or derivative thereof, which binds specifically to the OAcGD2 ganglioside presents a binding affinity (K d ) of more than 5 x 10 -5  M at 25° C. for GD2 ganglioside. 
     
     
         6 . The antibody of  claim 1 , wherein the antibody functional fragments or derivatives thereof comprises at least both of said heavy and light chains variable regions. 
     
     
         7 . The antibody of  claim 1 , wherein the antibody functional fragments or derivatives thereof are the membrane anchored single-chain variable part of a chimeric antigen receptor (CAR). 
     
     
         8 . The antibody of  claim 7 , wherein said CAR comprises an ectodomain, a transmembrane domain and an endodomain. 
     
     
         9 . The antibody of  claim 1 , wherein said antibody is an immunoconjugate. 
     
     
         10 . The antibody of  claim 1 , wherein said functional fragments is selected in the group comprising ScFv fragment, F ab  fragment, F ab ' fragment, F( ab ') 2  fragment, F acb  fragment, F v  and F d  fragments. 
     
     
         11 . A pharmaceutical composition comprising at least one antibody according to  claim 1 , functional fragment or derivative thereof, and a pharmaceutically acceptable carrier. 
     
     
         12 . The pharmaceutical composition as defined in  claim 11  for use in a method of preventing and/or treating cancer expressing the OAcGD2 ganglioside in a subject. 
     
     
         13 . The pharmaceutical composition of  claim 11 , wherein said subject is a mammal. 
     
     
         14 . The pharmaceutical composition of  claim 11 , wherein said cancer expressing the OAcGD2 ganglioside is selected in the group comprising neuroblastoma, glioma, retinoblastoma, Ewing’s family of tumors, sarcoma, small cell lung cancer, breast cancer, melanoma, metastatic renal carcinoma, head and neck cancer and hematological cancer. 
     
     
         15 . A method for diagnosing a cancer expressing the OAcGD2 ganglioside in a subject comprising the step of contacting a biological sample of said subject with at least one antibody, functional fragment or derivative thereof as defined in  claim 1 , for determining the OAcGD2 ganglioside expression level in said biological sample, wherein a detectable OAcGD2 ganglioside expression level is indicative of such a cancer. 
     
     
         16 . A kit for diagnosing a cancer expressing the OAcGD2 ganglioside in a subject, which comprises at least one antibody, functional fragment or derivative thereof as defined in  claim 1  and eventually means useful to the administration of said antibody, functional fragment or derivative thereof to said subject. 
     
     
         17 . The antibody of  claim 1 , wherein said antibody, functional fragment or derivative thereof, which binds specifically to the OAcGD2 ganglioside presents a K d  of equal to or less than 5 x 10 -7  M, for said ganglioside at 25° C. 
     
     
         18 . The antibody of  claim 1 , wherein said antibody, functional fragment or derivative thereof, which binds specifically to the OAcGD2 ganglioside presents a K d  of equal to or less than 5 x 10 -8  M, for said ganglioside at 25° C. 
     
     
         19 . The antibody of  claim 1 , wherein said antibody, functional fragment or derivative thereof, which binds specifically to the OAcGD2 ganglioside presents a binding affinity (K d ) of more than 10 -5  M at 25° C. for GD2 ganglioside. 
     
     
         20 . The pharmaceutical composition of  claim 13 , wherein the subject is a human.