Abstract
The relative biological properties of 111In-labeled monoclonal antibodies (MoAb) coupled with a conventional bifunctional chelate (BC) and a new, enzyme metabolizable, bifunctional chelate (BCM) were investigated. A rat IgG2a MoAb against idiotype from a mouse B-cell lymphoma was utilized. Mice bearing B-cell lymphomas in the subcutaneous tissues of the flank were given IV-injections of labeled MoAb and imaged or killed for organ counting at 24 h or 48 h. Rat anti-dinitrophenyl IgG2a MoAb and non-specific polyclonal mouse IgG were used as controls. Compared to BC, the use of BCM resulted in a substantial decrease in blood background activity, a shorter biological half-life and an increase in tumor to blood ratio at the expense of a moderate decrease in absolute tumor uptake. The versatile chemistry of these C-1 substituted bifunctional chelates provides a variety of possible enzyme cleavable moieties for further investigation.
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Supported in part by N.I.H. research grants CA 16861 (C.F.M.) and CA 28343 (D.A.G.) and by a grant from the Veteran's Administration
Michael K. Haseman is a recipient of the Robert Reid Newell Memorial Award
Mark S. Kaminski is a recipient of the Damon Runyan-Walter Winchell Postdoctorol Fellowship
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Haseman, M.K., Goodwin, D.A., Meares, C.F. et al. Metabolizable 111in chelate conjugated anti-idiotype monoclonal antibody for radioimmunodetection of lymphoma in mice. Eur J Nucl Med 12, 455–460 (1986). https://doi.org/10.1007/BF00254750
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DOI: https://doi.org/10.1007/BF00254750