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RESEARCH PRODUCT
Bispecific antibodies targeting tumor-associated antigens and neutralizing complement regulators increase the efficacy of antibody-based immunotherapy in mice.
Chiara GarrovoPaolo MacorNelly MezzarobaDaniele SblatteroClaudio TripodoStefania BiffiFrancesco TedescoL. De MasoTiziano GaiottoValter GatteiSara CapollaPaolo DuriguttoSonia ZorzetRoberto MarzariErika Seccosubject
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.proteindescription
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 evaluated in a human-SCID model of Burkitt lymphoma. The distribution profile of bsAbs mimics the data obtained by studying the pharmacokinetics of anti-CD20 antibodies, showing a peak in the tumor mass 3-4 days after injection. The treatment with bsAbs completely prevented the development of human/SCID lymphoma. The tumor growth was blocked by the activation of the C cascade and by the recruitment of macrophages, polymorphonuclear and natural killer cells. This strategy can easily be applied to the other anti-tumor C-fixing antibodies currently used in the clinic or tested in preclinical studies using the same vector with the appropriate modifications.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-01-01 |