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Structural Plasticity of Synaptopodin in the Axon Initial Segment during Visual Cortex Development.

Annabelle Schlüter1,2, Domenico Del Turco3, Thomas Deller3

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Cerebral Cortex (New York, N.Y. : 1991)
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Summary

The cisternal organelle (CO) within the axon initial segment (AIS) is crucial for neuronal plasticity. Its size and presence influence AIS development, particularly under visual deprivation, highlighting its role in homeostatic adaptation.

Keywords:
axon initial segmentcisternal organellesensory deprivationsynaptopodinvisual cortex

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Developmental Biology

Background:

  • The axon initial segment (AIS) is critical for action potential generation and neuronal plasticity.
  • A subset of AIS in cortical neurons contains cisternal organelles (COs), formed by endoplasmic reticulum stacks, with poorly understood functions.
  • COs are hypothesized to be involved in local calcium (Ca2+) trafficking and AIS plasticity.

Purpose of the Study:

  • To investigate the link between CO presence/size and AIS development/maturation in cortical neurons.
  • To analyze the relationship between COs and AIS during visual cortex development under normal and visual deprivation conditions.

Main Methods:

  • Utilized immunolabeling for synaptopodin (CO marker), ankyrin-G, and ßIV-spectrin (AIS markers) in wildtype mice.
  • Examined visual cortex development in wildtype and synaptopodin-deficient mice under control and dark-rearing (visual deprivation) conditions.

Main Results:

  • Dark rearing led to increased synaptopodin cluster sizes in wildtype mice, suggesting a homeostatic role for COs.
  • Synaptopodin-deficient mice, lacking COs, exhibited AIS shortening when reared in the dark.
  • These findings indicate COs are integral to AIS plasticity during visual cortex development.

Conclusions:

  • The cisternal organelle (CO) is a key component of the axon initial segment (AIS) machinery.
  • COs play a significant role in AIS plasticity, particularly during critical developmental periods.
  • COs contribute to homeostatic adaptation of the AIS in response to environmental stimuli like visual deprivation.