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Acute Leukemias

Monoclonal antibodies against IREM-1: potential for targeted therapy of AML

Abstract

IREM-1 is an inhibitory cell surface receptor with an unknown function and is expressed on myeloid cell lineages, including cell lines derived from acute myeloid leukemia (AML) patients. We have generated a series of monoclonal antibodies (mAbs) against the extracellular domain of IREM-1 and further assessed its expression in normal and AML cells. IREM-1 was restricted to cells from myeloid origin and extensive expression analysis in primary cells obtained from AML patients showed IREM-1 expression in leukemic blasts of 72% (39/54) of samples. We therefore searched for specific IREM-1 mAbs with activity in functional complement-dependent cytotoxicity (CDC) and antibody-dependent cellular cytotoxicity (ADCC). Lead mAbs against IREM-1 showed specific cytotoxic activity against a variety of AML-derived cell lines and freshly isolated blasts from AML patients. Internalization of mAbs upon IREM-1 binding was also shown. In vivo anticancer activity of lead mAbs was observed in an established HL-60 xenograft model with a tumor growth delay of up to 40% and in a model using primary human AML cells, where treatment with anti-IREM-1 mAb resulted in a significant reduction of engrafted human cells. These results demonstrate IREM-1 as a potential novel target for immunotherapy of AML.

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Acknowledgements

WK, XZ, SS, CP, JZ, MLG, SS, SY, SL, XZ, NT, CZ and DG performed experiments; WK, XZ, MLG, CTJ, JG, EDH and AA designed the studies, wrote and critically revised the manuscript.

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Correspondence to W Korver.

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Supplementary Information accompanies the paper on the Leukemia website (http://www.nature.com/leu)

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Korver, W., Zhao, X., Singh, S. et al. Monoclonal antibodies against IREM-1: potential for targeted therapy of AML. Leukemia 23, 1587–1597 (2009). https://doi.org/10.1038/leu.2009.99

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