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Dynamic variation in forebrain estradiol levels during song learning.

Andrew Chao1, Ashley Paon, Luke Remage-Healey

  • 1Neuroscience and Behavior Program, Center for Neuroendocrine Studies, Department of Psychological and Brain Sciences, University of Massachusetts, Amherst, Massachusetts, 01003.

Developmental Neurobiology
|September 11, 2014
PubMed
Summary

Brain estrogen levels in juvenile zebra finches are not sexually differentiated early on but emerge later. Neuroestrogen levels rise after song tutoring, aiding memory consolidation and showing circadian influence.

Keywords:
cortexmemoryneuromodulationnongenomicsex differencessong system

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Area of Science:

  • Neuroendocrinology
  • Developmental Neuroscience
  • Behavioral Neuroscience

Background:

  • Estrogens play a crucial role in shaping brain circuits during development, influencing sexual differentiation and neuromodulation.
  • Local estrogen synthesis in the brain is vital for these developmental processes.
  • Previous methods limited the in vivo study of dynamic brain estrogen fluctuations.

Purpose of the Study:

  • To investigate the developmental trajectory of neuroestrogen synthesis in zebra finches.
  • To determine if neuroestrogens are sexually differentiated during critical developmental periods.
  • To explore the dynamic response of brain estrogens to song tutoring in juvenile birds.

Main Methods:

  • Utilized an optimized in vivo method for detecting and quantifying brain estrogen fluctuations.
  • Measured baseline and song-tutoring-induced neuroestradiol levels in juvenile and adult male and female zebra finches.
  • Analyzed neuroestrogen profiles in the caudal forebrain.

Main Results:

  • Baseline neuroestradiol levels did not differ between sexes in early development but showed sexual differentiation as animals approached maturity.
  • Neuroestradiol levels in juveniles were elevated following, not during, passive song tutoring.
  • Fluctuations in neuroestrogens demonstrated a circadian influence during sensory/cognitive tasks.

Conclusions:

  • Brain estrogen synthesis is dynamically regulated during development and learning in zebra finches.
  • Post-learning elevation of neuroestrogens suggests a role in consolidating tutor song memories.
  • Findings reveal novel aspects of juvenile brain estrogen synthesis impacting sexual development and memory consolidation.