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Cancer Immunology, Immunotherapy
Published in: Cancer Immunology, Immunotherapy 7/2007

01-07-2007 | Original Article

CD20-specific antibody-targeted chemotherapy of non-Hodgkin’s B-cell lymphoma using calicheamicin-conjugated rituximab

Authors: John F. DiJoseph, Maureen M. Dougher, Douglas C. Armellino, Lyka Kalyandrug, Arthur Kunz, Erwin R. Boghaert, Philip R. Hamann, Nitin K. Damle

Published in: Cancer Immunology, Immunotherapy | Issue 7/2007

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Abstract

Tumor-targeted delivery of a potent cytotoxic agent, calicheamicin, using its immunoconjugates is a clinically validated therapeutic strategy. Rituximab is a human CD20-specific chimeric antibody extensively used in B-NHL therapy. We investigated whether conjugation to calicheamicin can improve the anti-tumor activity of rituximab against human B-cell lymphoma (BCL) xenografts in preclinical models. BCL cells were cultured with rituximab or its calicheamicin conjugates and their in vitro growth was monitored. BCL cells were injected s.c. to establish localized xenografts in nude mice or i.v. to establish disseminated BCL in severe combined immunodeficient (scid) mice. I.p. treatment with rituximab or its calicheamicin conjugates was initiated and its effect on s.c. BCL growth or survival of mice with disseminated BCL was monitored. Conjugation of calicheamicin to rituximab vastly enhanced its growth inhibitory activity against BCL in vitro. Conjugation to calicheamicin had no deleterious effect on the effector functional activity of rituximab. Calicheamicin conjugated to rituximab with an acid-labile linker exhibited greater anti-tumor activity against s.c. BCL xenografts and improved survival of mice with disseminated BCL over that of unconjugated rituximab. Anti-tumor activities of rituximab conjugated to calicheamicin via an acid-stable linker were similar to that of unconjugated rituximab. Superior anti-tumor efficacy exhibited by a calicheamicin immunoconjugate of rituximab with an acid-labile linker over that of rituximab demonstrates the therapeutic potential of CD20-specific antibody-targeted chemotherapy strategy in the treatment of B-NHL.
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Metadata
Title
CD20-specific antibody-targeted chemotherapy of non-Hodgkin’s B-cell lymphoma using calicheamicin-conjugated rituximab
Authors
John F. DiJoseph
Maureen M. Dougher
Douglas C. Armellino
Lyka Kalyandrug
Arthur Kunz
Erwin R. Boghaert
Philip R. Hamann
Nitin K. Damle
Publication date
01-07-2007
Publisher
Springer-Verlag
Published in
Cancer Immunology, Immunotherapy / Issue 7/2007
Print ISSN: 0340-7004
Electronic ISSN: 1432-0851
DOI
https://doi.org/10.1007/s00262-006-0260-5

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