Korver W, Singh S, Liu S, Zhao X, Yonkovich S, Sweeney A, Anton K, Lomas WE, Greenwood R, Smith A, Tran DH, Shinkawa P, Jimenez M, Yeung P, Aguilar G, Palencia S, Vatta P, Mueller M, Zhan X, Newton EM, Liu Y, Zhao J, Emtage P, Levy MD, Hsi ED, Funk WD, Abo A. The lymphoid cell surface receptor NTB-A: a novel monoclonal antibody target for leukaemia and lymphoma therapeutics.
Br J Haematol 2007;
137:307-18. [PMID:
17456053 DOI:
10.1111/j.1365-2141.2007.06569.x]
[Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
NTB-A is a CD2-related cell surface protein expressed primarily on lymphoid cells including B-lymphocytes from chronic lymphocytic leukaemia (CLL) and lymphoma patients. We have generated a series of monoclonal antibodies (mAbs) against NTB-A and assessed their therapeutic potential for CLL. Selective mAbs to NTB-A were further tested in functional complement-dependent cytotoxicity (CDC) and antibody-dependent cellular cytotoxicty (ADCC) assays in cell lines and B lymphocytes freshly isolated from CLL patients. While lower levels of NTB-A were detected in T and natural killer (NK) cells, CDC activity was demonstrated primarily in B cells isolated from CLL patients and B lymphoma cell lines. Knockdown of NTB-A by small interfering RNA in target cells results in lower cytotoxicity, demonstrating the specificity of the mAbs. Furthermore, anti NTB-A mAbs demonstrated anti-tumour activity against CA46 human lymphoma xenografts in nude mice and against systemically disseminated Raji human lymphoma cells in severe combined immunodeficient mice. Taken together, these results demonstrate NTB-A as a potential new target for immunotherapy of leukaemia and lymphomas.
Collapse