Abstract
Antibody-targeted chemotherapy with immunoconjugates of calicheamicin is a clinically validated strategy in cancer therapy. This study describes the selection of a murine anti-CD22 mAb, m5/44, as a targeting agent, its conjugation to a derivative of calicheamicin (CalichDM) via either acid-labile or acid-stable linkers, the antitumor activity of CalichDM conjugated to m5/44, and its subsequent humanization by CDR grafting. Murine IgG1 mAb m5/44 was selected based on its subnanomolar affinity for CD22 and ability to be internalized into B cells. CalichDM conjugated to m5/44 caused potent growth inhibition of CD22+ human B-cell lymphomas (BCLs) in vitro. The conjugate of m5/44 with an acid-labile linker was more potent than an acid-stable conjugate, a nonbinding conjugate with a similar acid-labile linker, or unconjugated CalichDMH in inhibiting BCL growth. CalichDM conjugated to m5/44 caused regression of established BCL xenografts in nude mice. In contrast, both unconjugated m5/44 and a nonbinding conjugate were ineffective against these xenografts. Based on the potent antitumor activity of m5/44-CalichDM conjugates, m5/44 was humanized by CDR grafting to create g5/44, an IgG4 anti-CD22 antibody. Both m5/44 and g5/44 bound CD22 with subnanomolar affinity. Competitive blocking with previously characterized murine anti-CD22 mAbs suggested that g5/44 recognizes epitope A located within the first N-terminal Ig-like domain of human CD22. Antitumor efficacy of CalichDM conjugated to g5/44 against BCL xenografts was more potent than its murine counterpart. Based on these results, a calicheamicin conjugate of g5/44, CMC-544, was selected for further development as a targeted chemotherapeutic agent for the treatment of B-cell malignancies.
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Abbreviations
- AcBut:
-
4-(4′-Acetylphenoxy) butanoic acid
- AcPAc:
-
(3-Acetylphenyl) acetic acid
- ATC:
-
Antibody-targeted chemotherapy
- BCL:
-
B-cell lymphoma
- CalichDM:
-
N-Acetyl-γ-calicheamicin dimethyl disulfide derivative(s)
- CalichDMA:
-
CalichDM acid
- CalichDMH:
-
CalichDM hydrazide
- CDR:
-
Complementarity determining region
- NHL:
-
Non-Hodgkin’s lymphoma
- PBMC:
-
Peripheral blood mononuclear cell
- TAA:
-
Tumor-associated antigen
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Acknowledgements
We would like to thank Dr John Crocker of Birmingham Heartlands Hospital, Birmingham, UK, for the evaluation of m5/44 binding to the NHL biopsies; Dr Lyka Kalyandrug for studies with effector functions of antibodies; Fred Immerman for statistical evaluation of results; and Maureen Dougher and Latha Sridharan for assistance with various studies.
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DiJoseph, J.F., Popplewell, A., Tickle, S. et al. Antibody-targeted chemotherapy of B-cell lymphoma using calicheamicin conjugated to murine or humanized antibody against CD22. Cancer Immunol Immunother 54, 11–24 (2005). https://doi.org/10.1007/s00262-004-0572-2
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DOI: https://doi.org/10.1007/s00262-004-0572-2