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The

Hui Ji1,2, Bei Wang1,2, Yifan Shen1,2

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Summary
This summary is machine-generated.

The protein Orion acts as a bridge, connecting the "eat-me" signal phosphatidylserine (PS) on dying neurons to the engulfment receptor Draper (Drpr) in Drosophila, facilitating neuronal debris clearance.

Keywords:
Orionda neuronsepidermal cellsphagocytosisphosphatidylserine

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Immunology

Background:

  • Phagocytosis of degenerating neurons is crucial for tissue homeostasis.
  • The neuronal
  • eat-me
  • signal phosphatidylserine (PS) and the engulfment receptor Draper (Drpr) are known mediators of this process in Drosophila.
  • The precise mechanism by which PS is recognized by Drpr-expressing phagocytes in vivo is not fully understood.

Purpose of the Study:

  • To elucidate the mechanism of phosphatidylserine (PS) recognition by Draper (Drpr)-expressing phagocytes during neuronal degeneration in Drosophila.
  • To identify novel factors involved in mediating the interaction between PS and Drpr.

Main Methods:

  • Utilized multiple Drosophila models of dendrite degeneration.
  • Investigated the role of the chemokine-like protein Orion in PS recognition.
  • Performed mutagenesis analyses to identify functional domains of Orion.

Main Results:

  • Demonstrated that the Drosophila chemokine-like protein Orion binds to PS and detects its exposure on neurons.
  • Showed that Orion is supplied cell-non-autonomously to coat PS-exposing dendrites, facilitating the interaction between PS and Drpr.
  • Found that Orion accumulation on neurons potentiates phagocytosis, while its accumulation on phagocytes suppresses it.
  • Identified conserved sequence motifs in Orion important for its function, suggesting links to human immunomodulatory proteins.

Conclusions:

  • Orion acts as a crucial missing link in PS-mediated phagocytosis of degenerating neurons in Drosophila.
  • Orion's dosage is a key determinant of phagocyte sensitivity to neuronal PS.
  • The findings imply conserved mechanisms for neuronal phagocytosis across species.