Combining daratumumab with CD47 blockade prolongs survival in preclinical models of pediatric T-ALL
Acute lymphoblastic leukemia (ALL) is the most common malignant disease affecting children. Although therapeutic strategies have improved, T-cell acute lymphoblastic leukemia (T-ALL) relapse is associated with chemoresistance and a poor prognosis. One strategy to overcome this obstacle is the applic...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
7 July 2022
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| In: |
Blood
Year: 2022, Jahrgang: 140, Heft: 1, Pages: 45-57 |
| ISSN: | 1528-0020 |
| DOI: | 10.1182/blood.2021014485 |
| Online-Zugang: | Resolving-System, lizenzpflichtig: http://dx.doi.org/10.1182/blood.2021014485 Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1182/blood.2021014485 
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| Verfasserangaben: | Kristina Müller, Fotini Vogiatzi, Dorothee Winterberg, Thies Rösner, Lennart Lenk, Lorenz Bastian, Carina L. Gehlert, Marie-Pauline Autenrieb, Monika Brüggemann, Gunnar Cario, Martin Schrappe, Andreas E. Kulozik, Cornelia Eckert, Anke K. Bergmann, Beat Bornhauser, Jean-Pierre Bourquin, Thomas Valerius, Matthias Peipp, Christian Kellner, and Denis M. Schewe |
MARC
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| 245 | 1 | 0 | |a Combining daratumumab with CD47 blockade prolongs survival in preclinical models of pediatric T-ALL |c Kristina Müller, Fotini Vogiatzi, Dorothee Winterberg, Thies Rösner, Lennart Lenk, Lorenz Bastian, Carina L. Gehlert, Marie-Pauline Autenrieb, Monika Brüggemann, Gunnar Cario, Martin Schrappe, Andreas E. Kulozik, Cornelia Eckert, Anke K. Bergmann, Beat Bornhauser, Jean-Pierre Bourquin, Thomas Valerius, Matthias Peipp, Christian Kellner, and Denis M. Schewe |
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| 520 | |a Acute lymphoblastic leukemia (ALL) is the most common malignant disease affecting children. Although therapeutic strategies have improved, T-cell acute lymphoblastic leukemia (T-ALL) relapse is associated with chemoresistance and a poor prognosis. One strategy to overcome this obstacle is the application of monoclonal antibodies. Here, we show that leukemic cells from patients with T-ALL express surface CD38 and CD47, both attractive targets for antibody therapy. We therefore investigated the commercially available CD38 antibody daratumumab (Dara) in combination with a proprietary modified CD47 antibody (Hu5F9-IgG2σ) in vitro and in vivo. Compared with single treatments, this combination significantly increased in vitro antibody-dependent cellular phagocytosis in T-ALL cell lines as well as in random de novo and relapsed/refractory T-ALL patient-derived xenograft (PDX) samples. Similarly, enhanced antibody-dependent cellular phagocytosis was observed when combining Dara with pharmacologic inhibition of CD47 interactions using a glutaminyl cyclase inhibitor. Phase 2-like preclinical in vivo trials using T-ALL PDX samples in experimental minimal residual disease-like (MRD-like) and overt leukemia models revealed a high antileukemic efficacy of CD47 blockade alone. However, T-ALL xenograft mice subjected to chemotherapy first (postchemotherapy MRD) and subsequently cotreated with Dara and Hu5F9-IgG2σ displayed significantly reduced bone marrow infiltration compared with single treatments. In relapsed and highly refractory T-ALL PDX combined treatment with Dara and Hu5F9-IgG2σ was required to substantially prolong survival compared with single treatments. These findings suggest that combining CD47 blockade with Dara is a promising therapy for T-ALL, especially for relapsed/refractory disease harboring a dismal prognosis in patients. | ||
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