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1.
Oncoimmunology ; 11(1): 2113697, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-36016696

RESUMO

The use of T-cell engagers (TCEs) to treat solid tumors is challenging, and several have been limited by narrow therapeutic windows due to substantial on-target, off-tumor toxicities due to the expression of low levels of target antigens on healthy tissues. Here, we describe TNB-928B, a fully human TCE that has a bivalent binding arm for folate receptor alpha (FRα) to selectively target FRα overexpressing tumor cells while avoiding the lysis of cells with low levels of FRα expression. The bivalent design of the FRα binding arm confers tumor selectivity due to low-affinity but high-avidity binding to high FRα antigen density cells. TNB-928B induces preferential effector T-cell activation, proliferation, and selective cytotoxic activity on high FRα expressing cells while sparing low FRα expressing cells. In addition, TNB-928B induces minimal cytokine release compared to a positive control TCE containing OKT3. Moreover, TNB-928B exhibits substantial ex vivo tumor cell lysis using endogenous T-cells and robust tumor clearance in vivo, promoting T-cell infiltration and antitumor activity in mouse models of ovarian cancer. TNB-928B exhibits pharmacokinetics similar to conventional antibodies, which are projected to enable favorable administration in humans. TNB-928B is a novel TCE with enhanced safety and specificity for the treatment of ovarian cancer.


Assuntos
Anticorpos Biespecíficos , Neoplasias Ovarianas , Animais , Anticorpos Biespecíficos/uso terapêutico , Carcinoma Epitelial do Ovário , Feminino , Receptor 1 de Folato/metabolismo , Receptor 1 de Folato/uso terapêutico , Humanos , Camundongos , Neoplasias Ovarianas/tratamento farmacológico , Neoplasias Ovarianas/patologia , Linfócitos T
2.
MAbs ; 13(1): 1890411, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33818299

RESUMO

The therapeutic potential of targeting CD19 in B cell malignancies has garnered attention in the past decade, resulting in the introduction of novel immunotherapy agents. Encouraging clinical data have been reported for T cell-based targeting agents, such as anti-CD19/CD3 bispecific T-cell engager blinatumomab and chimeric antigen receptor (CAR)-T therapies, for acute lymphoblastic leukemia and B cell non-Hodgkin lymphoma (B-NHL). However, clinical use of both blinatumomab and CAR-T therapies has been limited due to unfavorable pharmacokinetics (PK), significant toxicity associated with cytokine release syndrome and neurotoxicity, and manufacturing challenges. We present here a fully human CD19xCD3 bispecific antibody (TNB-486) for the treatment of B-NHL that could address the limitations of the current approved treatments. In the presence of CD19+ target cells and T cells, TNB-486 induces tumor cell lysis with minimal cytokine release, when compared to a positive control. In vivo, TNB-486 clears CD19+ tumor cells in immunocompromised mice in the presence of human peripheral blood mononuclear cells in multiple models. Additionally, the PK of TNB-486 in mice or cynomolgus monkeys is similar to conventional antibodies. This new T cell engaging bispecific antibody targeting CD19 represents a novel therapeutic that induces potent T cell-mediated tumor-cell cytotoxicity uncoupled from high levels of cytokine release, making it an attractive candidate for B-NHL therapy.


Assuntos
Anticorpos Biespecíficos/farmacologia , Anticorpos Monoclonais Humanizados/farmacologia , Antineoplásicos Imunológicos/farmacologia , Linfócitos T CD4-Positivos/efeitos dos fármacos , Linfócitos T CD8-Positivos/efeitos dos fármacos , Citocinas/metabolismo , Citotoxicidade Imunológica/efeitos dos fármacos , Ativação Linfocitária/efeitos dos fármacos , Linfoma não Hodgkin/tratamento farmacológico , Animais , Anticorpos Biespecíficos/farmacocinética , Anticorpos Monoclonais Humanizados/farmacocinética , Antígenos CD19/imunologia , Antineoplásicos Imunológicos/farmacocinética , Complexo CD3/antagonistas & inibidores , Complexo CD3/imunologia , Linfócitos T CD4-Positivos/imunologia , Linfócitos T CD4-Positivos/metabolismo , Linfócitos T CD8-Positivos/imunologia , Linfócitos T CD8-Positivos/metabolismo , Técnicas de Cocultura , Humanos , Células K562 , Linfoma não Hodgkin/imunologia , Linfoma não Hodgkin/metabolismo , Macaca fascicularis , Camundongos Endogâmicos BALB C , Camundongos Endogâmicos NOD , Camundongos SCID , Ensaios Antitumorais Modelo de Xenoenxerto
3.
Sci Rep ; 11(1): 10592, 2021 05 19.
Artigo em Inglês | MEDLINE | ID: mdl-34011961

RESUMO

The use of recombinant interleukin-2 (IL-2) as a therapeutic protein has been limited by significant toxicities despite its demonstrated ability to induce durable tumor-regression in cancer patients. The adverse events and limited efficacy of IL-2 treatment are due to the preferential binding of IL-2 to cells that express the high-affinity, trimeric receptor, IL-2Rαßγ such as endothelial cells and T-regulatory cells, respectively. Here, we describe a novel bispecific heavy-chain only antibody which binds to and activates signaling through the heterodimeric IL-2Rßγ receptor complex that is expressed on resting T-cells and NK cells. By avoiding binding to IL-2Rα, this molecule circumvents the preferential T-reg activation of native IL-2, while maintaining the robust stimulatory effects on T-cells and NK-cells in vitro. In vivo studies in both mice and cynomolgus monkeys confirm the molecule's in vivo biological activity, extended pharmacodynamics due to the Fc portion of the molecule, and enhanced safety profile. Together, these results demonstrate that the bispecific antibody is a safe and effective IL-2R agonist that harnesses the benefits of the IL-2 signaling pathway as a potential anti-cancer therapy.


Assuntos
Anticorpos Biespecíficos/farmacologia , Antineoplásicos Imunológicos/farmacologia , Subunidade gama Comum de Receptores de Interleucina/agonistas , Subunidade beta de Receptor de Interleucina-2/agonistas , Linfócitos/efeitos dos fármacos , Animais , Células CHO , Cricetulus , Avaliação Pré-Clínica de Medicamentos , Células HEK293 , Humanos , Subunidade gama Comum de Receptores de Interleucina/imunologia , Subunidade beta de Receptor de Interleucina-2/imunologia , Macaca fascicularis , Masculino , Camundongos Endogâmicos BALB C
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