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Internalization and intracellular fate of anti-CD5 monoclonal antibody and anti-CD5 ricin A-chain immunotoxin in human leukemic T cells

S Ravel, M Colombatti and P Casellas

Department of Immunology, Sanofi Recherche, Montpellier, France.

We have investigated the entry and subsequent intracellular fate of T101 monoclonal antibody (MoAb) and T101-ricin A-chain (RTA) immunotoxin (IT) directed against the CD5 antigen (Ag) expressed on human leukemic CEM cells. We provide direct evidence for the internalization of T101 MoAb and the corresponding IT. Both the MoAb and IT were internalized at a relatively low rate. This slow internalization process could be related to the partial recycling of the MoAb/Ag or IT/Ag complexes. Analysis of the internalized molecules showed that their molecular weight was only partially altered after internalization and that no free A-chain could be found inside the cells, indicating that lysosomal degradation and cleavage of disulfide- linked conjugates is a quantitatively minor phenomenon compared with the localization of internalized anti-CD5 ITs in an endosomo-Golgi compartment, followed by their recycling to the cell surface. We believe that this is the major factor explaining the low efficacy of anti-CD5 IT when assayed in the absence of potentiating substances. Finally, we showed that the presence of ammonium chloride and monensin, which both dramatically enhance the kinetics of IT activity, did not affect the rate of internalization or the intracellular localization of the conjugate, suggesting that these activators could act at the postendocytotic level on a limited number of IT molecules.

Volume 79, Issue 6, pp. 1511-1517, 03/15/1992
Copyright © 1992 by The American Society of Hematology


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  Copyright © 1992 by American Society of Hematology         Online ISSN: 1528-0020