2026-06-26T19:32:41Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/109202025-10-04T00:05:21Zcom_10259_4862com_10259_5086com_10259_2604col_10259_4863

00925njm 22002777a 4500 dc Chromikova, Veronika author Tan, Jessica author Aslam, Sadaf author Rajabhathor, Arvind author Bermudez-Gonzalez, Maria author Ayllón Barasoain, Juan author Simon, Viviana author García Sastre, Adolfo author Salaun, Bruno author Nachbagauer, Raffael author Krammer, Florian author 2020-02 The stalk of the influenza virus hemagglutinin (HA) is an attractive target for antibody-based universal influenza virus vaccine development. While antibodies that target this part of the virus can be neutralizing, it has been shown in recent years that Fc receptor-mediated effector functions are of significant importance for the protective effect of anti-stalk antibodies. Several assays to measure Fc-Fc receptor interaction-based effector functions like antibody-dependent cellular cytotoxicity and antibody-dependent cellular phagocytosis exist, but they suffer from limitations such as low throughput and high run-to-run variability. Reporter assays for antibody-dependent cellular cytotoxicity based on reporter cells that express luciferase upon engagement of human FcγRIIIa with the Fc of antigen-bound antibodies have been developed as well. These reporter assays can be used in a higher throughput setting with limited run-to-run assay variability but since they express only one Fc receptor, their biological relevance is unclear. Here we optimized an antibody-dependent cellular cytotoxicity reporter assay to measure the activity of antibodies to the conserved stalk domain of H1 hemagglutinin. The assay was then correlated to a CD107a-based degranulation assay, and a strong and significant correlation could be observed. This data suggests that the FcγRIIIa-based reporter assay is a good substitute for functional assays, especially in settings where larger sample numbers need to be analyzed. 0264-410X https://hdl.handle.net/10259/10920 10.1016/j.vaccine.2020.01.008 1873-2518 Influenza hemagglutinin ADCC ADCP Effector functions Stalk antibodies Activity of human serum antibodies in an influenza virus hemagglutinin stalk-based ADCC reporter assay correlates with activity in a CD107a degranulation assay