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The activity of two immunotoxins composed of monoclonal antibody MoAb-16 and A-chain of ricin (MoAb-16-RTA) or A-chain of mistletoe lectin I (MoAb-16-MLIA)

Paprocka, M.; Wiedłocha, A.; Walzel, H.; Radzikowski, C.

Archivum Immunologiae et Therapiae Experimentalis 40(3-4): 223-227

1992

ISSN/ISBN: 0004-069X
PMID: 1300987
Document Number: 403902
The A-chains of ricin obtained from Ricinus communis or mistletoe lectin I from Viscum album were coupled to the monoclonal, anti-L1210V antibody MoAb-16, using SPDP as a cross linking agent. The cytotoxic activity in vitro of these immunotoxins was compared. Each of two immunotoxins tested, in vitro for 1 h in appropriate doses, caused irreversible inhibition of leukemic L1210 cells proliferation. Unexpectedly, MoAb-16-MLIA immunotoxin appeared to be cytotoxic to normal bone marrow progenitor cells, as observed in NCFU-S tests. Moreover, this immunotoxin revealed cytotoxic effect to the P388 leukemia cells which do not share the antigen, common within L1210 leukemia cells, detected by MoAb-16 antibody.

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