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Related Experiment Video

Updated: Feb 2, 2026

Differentiation and Characterization of Neural Progenitors and Neurons from Mouse Embryonic Stem Cells
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Complement C3a receptor modulates embryonic neural progenitor cell proliferation and cognitive performance.

Liam G Coulthard1, Owen A Hawksworth2, Jacinta Conroy2

  • 1Royal Brisbane and Women's Hospital, Brisbane, Queensland, Australia; School of Clinical Medicine, Faculty of Medicine, The University of Queensland, Brisbane, Australia.

Molecular Immunology
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Summary

The complement system

Keywords:
C3aRComplementNeural stem cellNeurogenesis

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Area of Science:

  • Neuroscience
  • Immunology
  • Developmental Biology

Background:

  • The complement system, a key part of innate immunity, is increasingly recognized for its role in brain development.
  • The C3a receptor (C3aR) is functionally related to C5a receptors, but its role in neural stem cell proliferation is largely unknown.
  • While C5a receptor (C5aR1) promotes neural stem cell proliferation, C3aR's function in this process remains to be elucidated.

Purpose of the Study:

  • To investigate the role of the C3a receptor (C3aR) in embryonic neural progenitor cell (NPC) proliferation and its impact on brain development.
  • To compare the function of C3aR with that of C5aR1 in the developing mammalian brain.
  • To assess the long-term effects of C3aR signaling on cognitive functions in adult mice.

Main Methods:

  • Expression analysis of C3aR in the embryonic ventricular zone of mice.
  • In utero administration of C3aR agonists and antagonists to study NPC proliferation.
  • Phenotypic analysis of C3aR knockout (C3aR-/-) mice.
  • Cognitive behavioral testing in adult C3aR-/- mice to evaluate recall memory.

Main Results:

  • C3aR is expressed at the apical pole of the embryonic ventricular zone, similar to C5aR1, but exerts an opposing function.
  • Pharmacological activation or blockade of C3aR significantly alters apical neural progenitor cell (NPC) proliferation in developing brains.
  • C3aR knockout mice exhibit altered NPC proliferation with a phenotype distinct from pharmacological manipulation.
  • Adult C3aR knockout mice display subtle deficits in recall memory, despite normal gross development.

Conclusions:

  • C3aR plays a critical role in regulating neural progenitor cell proliferation during mammalian brain development.
  • Both C3a and C5a signaling pathways are essential for normal neurodevelopment.
  • Dysregulation of C3aR signaling can lead to subtle cognitive impairments, highlighting its importance in brain function.