CD3 directed bispecific antibodies induce increased lymphocyte-endothelial cell interactions in vitro |
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Authors: | Molema G Tervaert J W Kroesen B J Helfrich W Meijer D K de Leij L F |
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Institution: | 1Department of Pathology and Lab Medicine, Groningen University Institute for Drug Exploration (GUIDE), Laboratory for Tumor Immunology, Hanzeplein 1, Groningen, GZ, 9713, The Netherlands;2Department of Pharmacokinetics and Drug Delivery, University Center for Pharmacy, Ant. Deusinglaan 1, Groningen, AV, 9713, The Netherlands;3Department of Clinical Immunology, Hanzeplein 1, Groningen, GZ, 9713, The Netherlands |
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Abstract: | Bispecific antibody (BsMAb) BIS-1 has been developed to redirect the cytolytic activity of cytotoxic T lymphocytes (CTL) to epithelial glycoprotein-2 (EGP-2) expressing tumour cells. Intravenous administration of BIS-1 F(ab')2 to carcinoma patients in a phase I/II clinical trial, caused immunomodulation as demonstrated by a rapid lymphopenia prior to a rise in plasma tumour necrosis factor-alpha and interferon-gamma levels. Yet, no lymphocyte accumulation in the tumour tissue and no anti-tumour effect could be observed. These data suggest a BsMAb-induced lymphocyte adhesion to blood vessel walls and/or generalized redistribution of the lymphocytes into tissues. In this study, we describe the effects of BIS-1 F(ab')2 binding to peripheral blood mononuclear cells (PBMC) on their capacity to interact with resting endothelial cells in vitro. Resting and pre-activated PBMC exhibited a significant increase in adhesive interaction with endothelial cells when preincubated with BIS-1 F(ab')2, followed by an increase in transendothelial migration (tem). Binding of BIS-1 F(ab')2 to PBMC affected the expression of a number of adhesion molecules involved in lymphocyte adhesion/migration. Furthermore, PBMC preincubated with BIS-1 F(ab')2 induced the expression of endothelial cell adhesion molecules E-selectin, VCAM-1 and ICAM-1 during adhesion/tem. These phenomena were related to the CD3 recognizing antibody fragment of the BsMAb and dependent on lymphocyte-endothelial cell contact. Possibly, in patients, the BIS-1 F(ab')2 infusion induced lymphopenia is a result of generalized activation of endothelial cells, leading to the formation of a temporary sink for lymphocytes. This process may distract the lymphocytes from homing to the tumour cells, and hence prevent the occurrence of BIS-1 F(ab')2 - CTL-mediated tumour cell lysis. |
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Keywords: | immunotherapy CD3 directed bispecific antibody PBMC adhesion transendothelial migration in vitro |
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