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Complement System in Neural Synapse Elimination in Development and Disease.

Jessy Presumey1, Allison R Bialas1, Michael C Carroll1

  • 1Program in Cellular and Molecular Medicine, Boston Children's Hospital, Boston, MA, United States.

Advances in Immunology
|August 23, 2017
PubMed
Summary
This summary is machine-generated.

The classical complement cascade plays a key role in brain development and disease by regulating synaptic pruning. Dysregulation of complement proteins contributes to neurodevelopmental and neurodegenerative disorders, offering potential therapeutic targets.

Keywords:
Complement C4LupusMicrogliaNeurodegenerationSchizophreniaSynaptic pruningType I IFN

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Area of Science:

  • Neuroscience
  • Immunology
  • Molecular Biology

Background:

  • The classical complement cascade is increasingly recognized for its role in brain development.
  • Complement proteins (C1q, C3, C4) are involved in synapse elimination by microglia during neural development.
  • Imbalances in synaptic pruning are linked to neurodevelopmental disorders like schizophrenia and autism.

Purpose of the Study:

  • To investigate the role of the complement cascade in synaptic pruning during normal brain development.
  • To explore the involvement of complement dysregulation in neurodevelopmental and neurodegenerative diseases.
  • To identify complement proteins as potential therapeutic targets for brain disorders.

Main Methods:

  • Analysis of complement protein function in synapse elimination.
  • Investigation of complement pathways in neurodevelopmental disorders (schizophrenia, autism).
  • Examination of complement activation in neurodegenerative diseases and inflammatory conditions (West Nile Virus, lupus).

Main Results:

  • Complement proteins C1q, C3, and C4 tag synapses for removal by microglia during development.
  • Complement dysregulation is implicated in synaptic pruning imbalances seen in neurodevelopmental disorders.
  • Aberrant complement activation contributes to synapse loss in neurodegenerative diseases and inflammatory conditions.

Conclusions:

  • The classical complement cascade is a critical regulator of synaptic pruning in the brain.
  • Complement dysregulation is a shared mechanism underlying synapse loss in various neurological disorders.
  • Complement proteins represent promising therapeutic targets for treating neurodevelopmental and neurodegenerative diseases.