Six-microns-under acts upstream of Draper in the glial phagocytosis of apoptotic neurons

Cell. 2008 May 2;133(3):498-509. doi: 10.1016/j.cell.2008.02.052.

Abstract

The removal of apoptotic cells by phagocytic neighbors is essential for metazoan development but remains poorly characterized. Here we report the discovery of a Drosophila phagocytosis receptor, Six-microns-under (SIMU), which is expressed in highly phagocytic cell types during development and required for efficient apoptotic cell clearance by glia in the nervous system and by macrophages elsewhere. SIMU is part of a conserved family of proteins that includes CED-1 and Draper (DRPR). Phenotypic analysis reveals that simu acts upstream of drpr in the same pathway and affects the recognition and engulfment of apoptotic cells, while drpr affects their subsequent degradation. SIMU strongly binds to apoptotic cells, presumably through its EMILIN-like domain, but requires no membrane anchoring, suggesting that it can function as a bridging molecule. Our study introduces an important factor in tissue-resident apoptotic clearance and underscores the prominent role of glia as "semiprofessional" phagocytes in the nervous system.

Publication types

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

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Apoptosis*
  • COS Cells
  • Cell Line
  • Central Nervous System
  • Chlorocebus aethiops
  • Drosophila Proteins / chemistry
  • Drosophila Proteins / genetics
  • Drosophila Proteins / metabolism*
  • Drosophila melanogaster / cytology
  • Drosophila melanogaster / embryology
  • Drosophila melanogaster / metabolism*
  • Epistasis, Genetic
  • Green Fluorescent Proteins / genetics
  • Green Fluorescent Proteins / metabolism
  • Membrane Proteins / chemistry
  • Membrane Proteins / genetics
  • Membrane Proteins / metabolism*
  • Molecular Sequence Data
  • Neuroglia / metabolism*
  • Neurons / cytology*
  • Phagocytosis*
  • Receptors, Immunologic / chemistry
  • Receptors, Immunologic / genetics
  • Receptors, Immunologic / metabolism
  • Sequence Alignment

Substances

  • Drosophila Proteins
  • Membrane Proteins
  • NimC4 protein, Drosophila
  • Receptors, Immunologic
  • drpr protein, Drosophila
  • phagocytosis receptor
  • Green Fluorescent Proteins