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Related Experiment Videos

Norepinephrine and learning-induced plasticity in infant rat olfactory system.

R M Sullivan1, D A Wilson, M Leon

  • 1Department of Psychobiology, University of California, Irvine 92717.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|November 1, 1989
PubMed
Summary

Norepinephrine (NE) is crucial for olfactory learning in neonatal rats. This neurotransmitter enables both behavioral responses and neural changes in the olfactory bulb, indicating its essential role in acquiring scent-related memories.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Behavioral Science

Background:

  • Postnatal olfactory learning establishes conditioned behaviors and modifies neural responses in the olfactory bulb.
  • Norepinephrine (NE) is a key neurotransmitter implicated in learning and memory processes.

Purpose of the Study:

  • To investigate the role of norepinephrine (NE) in postnatal olfactory learning in neonatal rat pups.
  • To determine if NE is sufficient and/or necessary for acquiring learned olfactory behaviors and neural responses.

Main Methods:

  • Neonatal rat pups (postnatal days 1-18) underwent olfactory classical conditioning with odor (CS) and tactile stimulation (UCS) pairings.
  • Pups received injections of NE beta-receptor agonist (isoproterenol) or antagonist (propranolol), or saline, prior to training.

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  • Learned responses were assessed via behavioral tests, 14C-2-deoxyglucose uptake in the olfactory bulb, and single-unit recordings of olfactory bulb neurons.

    • Main Results:

    • Olfactory learning, characterized by odor preference, enhanced olfactory bulb neural activity, and modified neuronal output, was achieved with NE modulation.
    • Administration of isoproterenol facilitated olfactory learning, while propranolol blocked the acquisition of learned behaviors and neural responses.
    • NE was found to be sufficient for, and potentially necessary for, the acquisition of olfactory learning.

    Conclusions:

    • Norepinephrine plays a critical role in the acquisition of learned olfactory behaviors and associated neural plasticity in the developing olfactory bulb.
    • Targeting NE pathways may offer therapeutic strategies for enhancing olfactory learning and memory during critical developmental periods.