Membrane-cytoskeletal crosstalk mediated by myosin-I regulates adhesion turnover during phagocytosis

SR Barger, NS Reilly, MS Shutova, Q Li… - Nature …, 2019 - nature.com
SR Barger, NS Reilly, MS Shutova, Q Li, P Maiuri, JM Heddleston, MS Mooseker, RA Flavell
Nature communications, 2019nature.com
Phagocytosis of invading pathogens or cellular debris requires a dramatic change in cell
shape driven by actin polymerization. For antibody-covered targets, phagocytosis is thought
to proceed through the sequential engagement of Fc-receptors on the phagocyte with
antibodies on the target surface, leading to the extension and closure of the phagocytic cup
around the target. We find that two actin-dependent molecular motors, class 1 myosins
myosin 1e and myosin 1f, are specifically localized to Fc-receptor adhesions and required …
Abstract
Phagocytosis of invading pathogens or cellular debris requires a dramatic change in cell shape driven by actin polymerization. For antibody-covered targets, phagocytosis is thought to proceed through the sequential engagement of Fc-receptors on the phagocyte with antibodies on the target surface, leading to the extension and closure of the phagocytic cup around the target. We find that two actin-dependent molecular motors, class 1 myosins myosin 1e and myosin 1f, are specifically localized to Fc-receptor adhesions and required for efficient phagocytosis of antibody-opsonized targets. Using primary macrophages lacking both myosin 1e and myosin 1f, we find that without the actin-membrane linkage mediated by these myosins, the organization of individual adhesions is compromised, leading to excessive actin polymerization, slower adhesion turnover, and deficient phagocytic internalization. This work identifies a role for class 1 myosins in coordinated adhesion turnover during phagocytosis and supports a mechanism involving membrane-cytoskeletal crosstalk for phagocytic cup closure.
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