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A Lateralized Odor Learning Model in Neonatal Rats for Dissecting Neural Circuitry Underpinning Memory Formation
Published on: August 18, 2014
Dopaminergic modulation of olfactory bulb processing affects odor discrimination learning in rats
Olga Escanilla1, Courtney Yuhas, David Marzan
1Computational Physiology Lab, Neurobiology and Behavior, Cornell University, Ithaca, NY 14853, USA.
Behavioral Neuroscience
|July 29, 2009
Summary
Directly infusing D2 receptor blockers into the olfactory bulb improved odor discrimination in rats, while D2 activation impaired it. D1 receptor modulation had no significant effect on olfactory perception.
Area of Science:
- Neuroscience
- Olfactory System Research
- Dopamine Receptor Function
Background:
- Systemic D1 and D2 receptor modulation show opposing effects on odor discrimination learning.
- Direct modulation of olfactory bulb dopamine receptors requires investigation for localized effects on olfactory perception.
Purpose of the Study:
- To investigate the effects of direct D1 and D2 dopaminergic receptor modulation within the olfactory bulb on olfactory perception.
- To determine if local D1/D2 receptor manipulation impacts odor discrimination performance.
Main Methods:
- Male Sprague-Dawley rats were cannulated for direct infusion of D1/D2 agonists and antagonists into the olfactory bulb.
- Receptor manipulation involved D1 agonists/antagonists (SKF 82958, SCH-23390) and D2 agonists/antagonists (quinpirole, sulpiride) at varying concentrations.
- Performance was assessed during a simultaneous odor discrimination task.
Main Results:
- Modulation of D2 receptors significantly impacted rats' odor discrimination performance.
- D1 receptor modulation in the olfactory bulb did not significantly affect odor discrimination.
- A positive correlation was observed between D2 receptor blockade and improved discrimination.
- A negative correlation was found between D2 receptor activation and discrimination performance.
Conclusions:
- Local D2 receptor activity in the olfactory bulb plays a crucial role in regulating olfactory perception and odor discrimination.
- D1 receptors in the olfactory bulb are not critical for modulating odor discrimination performance.
- Targeting D2 receptors in the olfactory bulb may offer a strategy for enhancing olfactory function.
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