Regulation of myeloid cell phagocytosis by LRRK2 via WAVE2 complex stabilization is altered in Parkinson's disease

Proc Natl Acad Sci U S A. 2018 May 29;115(22):E5164-E5173. doi: 10.1073/pnas.1718946115. Epub 2018 May 14.

Abstract

Leucine-rich repeat kinase 2 (LRRK2) has been implicated in both familial and sporadic Parkinson's disease (PD), yet its pathogenic role remains unclear. A previous screen in Drosophila identified Scar/WAVE (Wiskott-Aldrich syndrome protein-family verproline) proteins as potential genetic interactors of LRRK2 Here, we provide evidence that LRRK2 modulates the phagocytic response of myeloid cells via specific modulation of the actin-cytoskeletal regulator, WAVE2. We demonstrate that macrophages and microglia from LRRK2-G2019S PD patients and mice display a WAVE2-mediated increase in phagocytic response, respectively. Lrrk2 loss results in the opposite effect. LRRK2 binds and phosphorylates Wave2 at Thr470, stabilizing and preventing its proteasomal degradation. Finally, we show that Wave2 also mediates Lrrk2-G2019S-induced dopaminergic neuronal death in both macrophage-midbrain cocultures and in vivo. Taken together, a LRRK2-WAVE2 pathway, which modulates the phagocytic response in mice and human leukocytes, may define an important role for altered immune function in PD.

Keywords: LRRK2; Parkinson’s disease; WASF2; WAVE2; microglia.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cell Line
  • Cytophagocytosis / physiology*
  • Drosophila
  • Humans
  • Leucine-Rich Repeat Serine-Threonine Protein Kinase-2 / metabolism*
  • Mice
  • Microglia
  • Myeloid Cells / cytology*
  • Myeloid Cells / physiology
  • Parkinson Disease / physiopathology*
  • Signal Transduction / physiology
  • Wiskott-Aldrich Syndrome Protein Family / metabolism*

Substances

  • WASF2 protein, human
  • Wiskott-Aldrich Syndrome Protein Family
  • LRRK2 protein, human
  • Leucine-Rich Repeat Serine-Threonine Protein Kinase-2

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