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

Nat Commun. 2019 Mar 19;10(1):1249. doi: 10.1038/s41467-019-09104-1.

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.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Video-Audio Media

MeSH terms

  • Actins / metabolism*
  • Actins / ultrastructure
  • Animals
  • Bone Marrow Cells
  • Cell Adhesion / physiology*
  • Cell Membrane / metabolism
  • Cell Membrane / ultrastructure
  • Cytoskeleton / metabolism
  • Cytoskeleton / ultrastructure
  • Female
  • Intravital Microscopy
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Microscopy, Electron
  • Microscopy, Fluorescence
  • Myosin Type I / genetics
  • Myosin Type I / metabolism*
  • Myosins / genetics
  • Myosins / metabolism*
  • Phagocytosis / physiology*
  • Primary Cell Culture
  • RAW 264.7 Cells
  • Receptors, Fc / metabolism
  • Receptors, Fc / ultrastructure
  • Time-Lapse Imaging

Substances

  • Actins
  • MYO1F protein, human
  • Myo1f protein, mouse
  • Receptors, Fc
  • MYO1E protein, human
  • Myo1e protein, mouse
  • Myosin Type I
  • Myosins