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Developmental changes in the subcellular localization of calretinin.

N J Hack1, M C Wride, K M Charters

  • 1Department of Neurobiology and Anatomy, University of Utah School of Medicine, Salt Lake City, Utah 84132, USA. Nicola.Hack@hsc.utah.edu

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|March 24, 2000
PubMed
Summary

Calretinin (CR) in chick brainstem auditory neurons shifts from diffuse to membrane-associated localization during development. This change coincides with neuronal activity and may help manage calcium influxes.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Developmental Biology

Background:

  • Brainstem auditory neurons in the chick nucleus magnocellularis (NM) express high levels of calretinin (CR).
  • Calretinin (CR) has been traditionally viewed as a diffusible calcium buffer within the cytosol.

Purpose of the Study:

  • To investigate the developmental changes in calretinin (CR) localization within chick NM neurons.
  • To understand the functional implications of CR's subcellular distribution in auditory pathway development.

Main Methods:

  • High-resolution confocal microscopy was employed to visualize CR distribution.
  • Biochemical analyses were conducted to characterize CR's association with cellular membranes.

Main Results:

  • During NM neuron development, CR transitioned from diffuse, low-concentration expression to high concentration beneath the plasma membrane.
  • This subcellular localization shift occurred concurrently with the onset of spontaneous activity, synaptic transmission, and synapse refinement.
  • CR's membrane association was found to be detergent-soluble and calcium-independent, unlike calmodulin which remained diffusely expressed.

Conclusions:

  • The developmental redistribution of calretinin (CR) to the plasma membrane in NM neurons is a unique event in the chick brainstem auditory pathway.
  • This localization suggests an adaptation to manage calcium influxes in highly active neurons with numerous Ca2+-permeable AMPA receptors.