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Related Concept Videos

Neurotransmitters01:31

Neurotransmitters

Neurotransmitters are essential chemical messengers within the nervous system, facilitating the communication between neurons. These chemical messengers, varying in function and effect, are critical for sustaining various aspects of neurological health and emotional well-being.
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Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...

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Related Experiment Video

Updated: Jun 25, 2026

Inducing Long-Term Plasticity of Intrinsic Neuronal Excitability in Neurons of the Dorsal Lateral Geniculate Nucleus
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Astrocytic plasticity and patterned oxytocin neuronal activity: dynamic interactions.

Yu-Feng Wang1, Glenn I Hatton

  • 1Department of Cell Biology and Neuroscience, University of California, Riverside, California 92521, USA. ywang4@lsuhsc.edu

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|February 13, 2009
PubMed
Summary

Glial fibrillary acidic protein (GFAP) dynamics in astrocytes are crucial for brain function. This study reveals how GFAP plasticity in the supraoptic nucleus reflects oxytocin neuronal activity during the milk-ejection reflex.

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Area of Science:

  • Neuroscience
  • Astroglial-neuronal interactions
  • Cellular and Molecular Biology

Background:

  • Astroglial-neuronal interactions are vital for brain function.
  • The specific role of glial fibrillary acidic protein (GFAP) in acute physiological processes, particularly in neuroendocrine regulation, remains largely unexplored.
  • The supraoptic nucleus (SON) is a key area for studying neurohormonal reflexes like the milk-ejection reflex (MER).

Purpose of the Study:

  • To investigate the dynamic changes in GFAP expression and its association with astrocytic proteins during the MER in lactating rats.
  • To elucidate the role of astrocytes and GFAP in mediating the MER and its relationship with oxytocin (OT) neuronal activity.
  • To understand how physiological stimuli like suckling influence GFAP plasticity and astroglial-neuronal communication in the SON.

Main Methods:

  • Disabling astrocytic function using l-aminoadipic acid (l-AAA) to assess its impact on MER and GFAP levels.
  • Employing immunocytochemistry and Western blotting to quantify GFAP expression and localization.
  • Utilizing brain slices to examine the effects of OT, electrical stimulation (K+), and pharmacological agents (tetanus toxin, protease inhibitors) on neuronal activity and GFAP.
  • Analyzing the co-localization and association of GFAP with other key astrocytic proteins like aquaporin 4, actin, and glutamine synthetase.

Main Results:

  • Disabling astrocytes with l-AAA blocked the MER and reduced GFAP levels, oxytocin (OT) neuronal activity, and excitatory postsynaptic currents (EPSCs).
  • Suckling and OT administration led to decreased GFAP expression, which was partially reversed post-MER or by simulated neuronal activity (K+ exposure).
  • GFAP association with aquaporin 4 decreased during early suckling and increased post-MER, while GFAP-actin association showed opposite changes, indicating dynamic remodeling of astrocytic processes.

Conclusions:

  • GFAP undergoes significant plasticity in response to physiological demands, dynamically reflecting oxytocin neuronal activity in the SON during the MER.
  • Astrocyte function, modulated by GFAP dynamics, plays an essential role in the milk-ejection reflex.
  • These findings highlight the intricate communication between glial cells and neurons in regulating neuroendocrine functions.