Kimura N, Kawai S, Kinoshita Y, Ishiguro T, Azuma Y, Ozaki S, Abe M, Sugimoto M, Hirata Y, Orita T, Okabe H, Matsumoto T, Tsuchiya M. 2D7 diabody bound to the α2 domain of HLA class I efficiently induces caspase-independent cell death against malignant and activated lymphoid cells.
Biochem Biophys Res Commun 2004;
325:1201-9. [PMID:
15555554 DOI:
10.1016/j.bbrc.2004.10.163]
[Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2004] [Indexed: 12/18/2022]
Abstract
A mouse monoclonal antibody (2D7 mAb), which specifically bound to the alpha2 domain of HLA class I, rapidly induces cell aggregation accompanied by weak cytotoxicity against ARH-77 cells, suggesting that 2D7 mAb had a potential for agonist antibody. In order to enhance this cytotoxicity, 2D7 mAb was engineered to be a small bivalent antibody fragment, 2D7 diabody. The resultant 2D7 diabody showed a strong cytotoxicity against ARH-77 cells. As a notable characteristic feature, the lethal effect of 2D7 diabody was quite rapid, mediated by a caspase-independent death pathway. Furthermore, 2D7 diabody also showed cytotoxicity against several leukemia and lymphoma cell lines, and mitogen-activated peripheral blood mononuclear cells (PBMC), but not for normal resting PBMC and adherent cell lines such as HUVEC. These results suggest that 2D7 diabody could be expected as a novel therapeutic antibody for hematological malignancies as well as inflammatory diseases.
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