Anti-CD20-interleukin-21 fusokine targets malignant B cells via direct apoptosis and NK-cell-dependent cytotoxicity

In spite of newly emerging therapies and the improved survival of patients with non-Hodgkin lymphoma (NHL), relapses or primary refractory disease are commonly observed and associated with dismal prognosis. Although discovery of the anti-CD20 antibody rituximab has markedly improved outcomes in B-ce...

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Veröffentlicht in:Blood Jg. 129; H. 16; S. 2246
Hauptverfasser: Bhatt, Shruti, Parvin, Salma, Zhang, Yu, Cho, Hyun-Mi, Kunkalla, Kranthi, Vega, Francisco, Timmerman, John M, Shin, Seung-Uon, Rosenblatt, Joseph D, Lossos, Izidore S
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Sprache:Englisch
Veröffentlicht: United States 20.04.2017
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ISSN:1528-0020, 1528-0020
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Abstract In spite of newly emerging therapies and the improved survival of patients with non-Hodgkin lymphoma (NHL), relapses or primary refractory disease are commonly observed and associated with dismal prognosis. Although discovery of the anti-CD20 antibody rituximab has markedly improved outcomes in B-cell NHL, rituximab resistance remains an important obstacle to successful treatment of these tumors. To improve the efficacy of CD20-targeted therapy, we fused interleukin 21 (IL-21), which induces direct lymphoma cytotoxicity and activates immune effector cells, to the anti-CD20 antibody (αCD20-IL-21 fusokine). We observed substantially enhanced IL-21R-mediated signaling by the fusokine compared with native IL-21 at equimolar concentrations. Fusokine treatment led to direct apoptosis of lymphoma cell lines and primary tumors that otherwise were resistant to native IL-21 treatment. In addition to direct cytotoxicity, the fusokine enhanced NK cell activation, effector functions, and interferon γ production, resulting in greater antibody-dependent cell-mediated cytotoxicity compared with IL-21 and/or anti-CD20 antibody treatments. Further, the αCD20-IL-21 fusokine stabilizes IL-21 and prolongs its half-life. In vivo αCD20-IL-21 therapy resulted in a significant tumor control in the rituximab-resistant A20-huCD20 tumors. Collectively, the dual functional ability of the αCD20-IL-21 fusokine to induce direct apoptosis and activate immune effector cells may provide benefit over existing treatments for NHL.
AbstractList In spite of newly emerging therapies and the improved survival of patients with non-Hodgkin lymphoma (NHL), relapses or primary refractory disease are commonly observed and associated with dismal prognosis. Although discovery of the anti-CD20 antibody rituximab has markedly improved outcomes in B-cell NHL, rituximab resistance remains an important obstacle to successful treatment of these tumors. To improve the efficacy of CD20-targeted therapy, we fused interleukin 21 (IL-21), which induces direct lymphoma cytotoxicity and activates immune effector cells, to the anti-CD20 antibody (αCD20-IL-21 fusokine). We observed substantially enhanced IL-21R-mediated signaling by the fusokine compared with native IL-21 at equimolar concentrations. Fusokine treatment led to direct apoptosis of lymphoma cell lines and primary tumors that otherwise were resistant to native IL-21 treatment. In addition to direct cytotoxicity, the fusokine enhanced NK cell activation, effector functions, and interferon γ production, resulting in greater antibody-dependent cell-mediated cytotoxicity compared with IL-21 and/or anti-CD20 antibody treatments. Further, the αCD20-IL-21 fusokine stabilizes IL-21 and prolongs its half-life. In vivo αCD20-IL-21 therapy resulted in a significant tumor control in the rituximab-resistant A20-huCD20 tumors. Collectively, the dual functional ability of the αCD20-IL-21 fusokine to induce direct apoptosis and activate immune effector cells may provide benefit over existing treatments for NHL.In spite of newly emerging therapies and the improved survival of patients with non-Hodgkin lymphoma (NHL), relapses or primary refractory disease are commonly observed and associated with dismal prognosis. Although discovery of the anti-CD20 antibody rituximab has markedly improved outcomes in B-cell NHL, rituximab resistance remains an important obstacle to successful treatment of these tumors. To improve the efficacy of CD20-targeted therapy, we fused interleukin 21 (IL-21), which induces direct lymphoma cytotoxicity and activates immune effector cells, to the anti-CD20 antibody (αCD20-IL-21 fusokine). We observed substantially enhanced IL-21R-mediated signaling by the fusokine compared with native IL-21 at equimolar concentrations. Fusokine treatment led to direct apoptosis of lymphoma cell lines and primary tumors that otherwise were resistant to native IL-21 treatment. In addition to direct cytotoxicity, the fusokine enhanced NK cell activation, effector functions, and interferon γ production, resulting in greater antibody-dependent cell-mediated cytotoxicity compared with IL-21 and/or anti-CD20 antibody treatments. Further, the αCD20-IL-21 fusokine stabilizes IL-21 and prolongs its half-life. In vivo αCD20-IL-21 therapy resulted in a significant tumor control in the rituximab-resistant A20-huCD20 tumors. Collectively, the dual functional ability of the αCD20-IL-21 fusokine to induce direct apoptosis and activate immune effector cells may provide benefit over existing treatments for NHL.
In spite of newly emerging therapies and the improved survival of patients with non-Hodgkin lymphoma (NHL), relapses or primary refractory disease are commonly observed and associated with dismal prognosis. Although discovery of the anti-CD20 antibody rituximab has markedly improved outcomes in B-cell NHL, rituximab resistance remains an important obstacle to successful treatment of these tumors. To improve the efficacy of CD20-targeted therapy, we fused interleukin 21 (IL-21), which induces direct lymphoma cytotoxicity and activates immune effector cells, to the anti-CD20 antibody (αCD20-IL-21 fusokine). We observed substantially enhanced IL-21R-mediated signaling by the fusokine compared with native IL-21 at equimolar concentrations. Fusokine treatment led to direct apoptosis of lymphoma cell lines and primary tumors that otherwise were resistant to native IL-21 treatment. In addition to direct cytotoxicity, the fusokine enhanced NK cell activation, effector functions, and interferon γ production, resulting in greater antibody-dependent cell-mediated cytotoxicity compared with IL-21 and/or anti-CD20 antibody treatments. Further, the αCD20-IL-21 fusokine stabilizes IL-21 and prolongs its half-life. In vivo αCD20-IL-21 therapy resulted in a significant tumor control in the rituximab-resistant A20-huCD20 tumors. Collectively, the dual functional ability of the αCD20-IL-21 fusokine to induce direct apoptosis and activate immune effector cells may provide benefit over existing treatments for NHL.
Author Rosenblatt, Joseph D
Parvin, Salma
Zhang, Yu
Shin, Seung-Uon
Cho, Hyun-Mi
Timmerman, John M
Kunkalla, Kranthi
Bhatt, Shruti
Lossos, Izidore S
Vega, Francisco
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SubjectTerms Animals
Antibodies, Monoclonal, Murine-Derived - genetics
Antibodies, Monoclonal, Murine-Derived - immunology
Antigens, CD20 - genetics
Antigens, CD20 - immunology
Antineoplastic Agents - immunology
Antineoplastic Agents - metabolism
Antineoplastic Agents - pharmacokinetics
Apoptosis - drug effects
B-Lymphocytes - drug effects
B-Lymphocytes - immunology
B-Lymphocytes - pathology
Cytotoxicity, Immunologic - drug effects
Gene Expression
Half-Life
Humans
Interferon-gamma - biosynthesis
Interferon-gamma - immunology
Interleukins - genetics
Interleukins - immunology
Killer Cells, Natural - drug effects
Killer Cells, Natural - immunology
Killer Cells, Natural - pathology
Lymphoma, Non-Hodgkin - drug therapy
Lymphoma, Non-Hodgkin - genetics
Lymphoma, Non-Hodgkin - immunology
Lymphoma, Non-Hodgkin - pathology
Mice
Mice, Inbred BALB C
Mice, Transgenic
Molecular Targeted Therapy
Receptors, Interleukin-21 - genetics
Receptors, Interleukin-21 - immunology
Recombinant Fusion Proteins - genetics
Recombinant Fusion Proteins - immunology
Recombinant Fusion Proteins - pharmacokinetics
Signal Transduction
Title Anti-CD20-interleukin-21 fusokine targets malignant B cells via direct apoptosis and NK-cell-dependent cytotoxicity
URI https://www.ncbi.nlm.nih.gov/pubmed/28137826
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Volume 129
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