Search results for " CD55"

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In vivo targeting of human neutralizing antibodies against CD55 and CD59 to lymphoma cells increases the antitumor activity of rituximab.

2007

AbstractAn in vivo model of human CD20+ B-lymphoma was established in severe combined immunodeficiency mice to test the ability of human neutralizing miniantibodies to CD55 and CD59 (MB55 and MB59) to enhance the therapeutic effect of rituximab. The miniantibodies contained single-chain fragment variables and the hinge-CH2-CH3 domains of human IgG1. LCL2 cells were selected for the in vivo study among six B-lymphoma cell lines for their high susceptibility to rituximab-dependent complement-mediated killing enhanced by MB55 and MB59. The cells injected i.p. primarily colonized the liver and spleen, leading to the death of the animals within 30 to 40 days. Thirty percent of mice receiving bio…

Cancer ResearchLymphoma B-Cellmedicine.drug_classmedicine.medical_treatmentAntineoplastic AgentsCD59 AntigensAntigens CD59Mice SCIDPharmacologyMonoclonal antibodyAntigens CD55Antineoplastic AgentAntibodies Monoclonal Murine-DerivedMicerituximabIn vivomedicineAnimalsHumansantibodies against CD55 and CD59CD20Severe combined immunodeficiencyMice Inbred BALB CbiologyCD55 AntigensAnimalAntibody-Dependent Cell CytotoxicityAntibodies MonoclonalImmunotherapyrituximab; antibodies against CD55 and CD59medicine.diseaseDisease Models AnimalOncologyAnimals; Antibodies Monoclonal; Antibodies Monoclonal Murine-Derived; Antibody-Dependent Cell Cytotoxicity; Antigens CD55; Antigens CD59; Antineoplastic Agents; Disease Models Animal; Female; Humans; Lymphoma B-Cell; Mice; Mice Inbred BALB C; Mice SCID; Rituximab; Cancer Research; OncologyMonoclonalImmunologybiology.proteinRituximabFemaleAntibodymedicine.drugHuman
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Bispecific antibodies targeting tumor-associated antigens and neutralizing complement regulators increase the efficacy of antibody-based immunotherap…

2015

The efficacy of antibody-based immunotherapy is due to the activation of apoptosis, the engagement of antibody-dependent cellular cytotoxicity and complement-dependent cytotoxicity (CDC). We developed a novel strategy to enhance CDC using bispecific antibodies (bsAbs) that neutralize the C-regulators CD55 and CD59 to enhance C-mediated functions. Two bsAbs (MB20/55 and MB20/59) were designed to recognize CD20 on one side. The other side neutralizes CD55 or CD59. Analysis of CDC revealed that bsAbs could kill 4-25 times more cells than anti-CD20 recombinant antibody in cell lines or cells isolated from patients with chronic lymphocytic leukemia. The pharmacokinetics of the bsAbs was evaluate…

Cancer ResearchLymphomaMacrophageChronic lymphocytic leukemiamedicine.medical_treatmentAntibodieCell SeparationMice SCIDMiceAntibodies BispecificCloning MolecularCytotoxicityCD20LeukemiabiologyCD55 AntigensMedicine (all)HematologyFlow CytometryBurkitt LymphomaKiller Cells NaturalLeukemiaOncologyFemaleImmunotherapyAntibodybispecific antibodiesExperimental Lymphoma Mice MiceHumanComplement System ProteinCD59 AntigensEnzyme-Linked Immunosorbent AssayAntigens CD59Antigens CD55AntibodiesExperimentalAntigenbispecific antibodies; Leukemia; Experimental Lymphoma Mice Mice; complement systemmedicineAnimalsHumanscomplement systemAnimalMacrophagesAntibody-Dependent Cell CytotoxicityImmunotherapyComplement System Proteinsmedicine.diseaseAntigens CD20Complement systembispecific antibodieDisease Models AnimalAnesthesiology and Pain MedicineMicroscopy FluorescenceImmunologybiology.protein
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