Size-Dependent Segregation Controls Macrophage Phagocytosis of Antibody-Opsonized Targets.

ABSTRACT: Macrophages protect the body from damage and disease by targeting antibody-opsonized cells for phagocytosis. Though antibodies can be raised against antigens with diverse structures, shapes, and sizes, it is unclear why some are more effective at triggering immune responses than others. Here, we define an antigen height threshold that regulates phagocytosis of both engineered and cancer-specific antigens by macrophages. Using a reconstituted model of antibody-opsonized target cells, we find that phagocytosis is dramatically impaired for antigens that position antibodies >10 nm from the target surface. Decreasing antigen height drives segregation of antibody-bound Fc receptors from the inhibitory phosphatase CD45 in an integrin-independent manner, triggering Fc receptor phosphorylation and

SUBMITTER: Bakalar MH 

PROVIDER: S-EPMC6067926 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature