An antibody-drug conjugate with intracellular drug release properties showing specific cytotoxicity against CD7-positive cells.
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Embargo End Date
ICR Authors
Authors
Zhang, J
Jain, A
Milhas, S
Williamson, DJ
Mysliwy, J
Lodge, A
Thirlway, J
Al Nakeeb, M
Miller, A
Rabbitts, TH
Jain, A
Milhas, S
Williamson, DJ
Mysliwy, J
Lodge, A
Thirlway, J
Al Nakeeb, M
Miller, A
Rabbitts, TH
Document Type
Journal Article
Date
2021-09-01
Date Accepted
2021-05-14
Abstract
Refractory T cell acute leukaemias that no longer respond to treatment would benefit from new modalities that target T cell-specific surface proteins. T cell associated surface proteins (the surfaceome) offer possible therapy targets to reduce tumour burden but also target the leukaemia-initiating cells from which tumours recur. Recent studies of the T cell leukaemia surfaceome confirmed that CD7 is highly expressed in overt disease. We have used an anti-CD7 antibody drug conjugate (ADC) to show that the binding of antibody to surface CD7 protein results in rapid internalization of the antigen together with the ADC. As a consequence, cell killing was observed via induction of apoptosis and was dependent on cell surface CD7. The in vitro cytotoxic activity (EC50) of the anti-CD7 ADC on T cell acute leukaemia (T-ALL) cells Jurkat and KOPT-K1 was found to be in the range of 5-8 ng/mL. In a pre-clinical xenograft model of human tumour growth expressing CD7 antigen, growth was curtailed by a single dose of ADC. The data indicate that CD7 targeting ADCs may be developed into an important second stage therapy for T cell acute leukaemia, for refractory CD7-positive leukaemias and for subsets of acute myeloid leukaemia (AML) expressing CD7.
Citation
Leukemia research, 2021, 108 pp. 106626 - ?
Source Title
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
ISSN
0145-2126
eISSN
1873-5835
Collections
Research Team
Chromosomal Translocations and Intracellular Antibody Therapeutics
Chromosomal Translocations and Intracellular Antibody Therapeutics
Chromosomal Translocations and Intracellular Antibody Therapeutics