Related Experiment Video
Updated: May 11, 2026
06:40
Simple and Computer-assisted Olfactory Testing for Mice
Published on: June 15, 2015
Enhanced odor discrimination learning in aged Bax-KO mice.
1Department of Anatomy, Korea University College of Medicine, Brain Korea 21, Republic of Korea.
Neuroscience Letters
|May 21, 2013
Summary
New neuron replacement in the olfactory bulb (OB) is essential for normal olfactory learning. However, disrupting this process in aged mice unexpectedly enhanced their odor discrimination abilities.
Area of Science:
- Neuroscience
- Olfactory system research
- Adult neurogenesis
Background:
- Adult neurogenesis continuously generates new neurons in the olfactory bulb (OB) to replace lost cells.
- The functional significance of this continuous cell turnover on olfactory learning remains unclear.
Purpose of the Study:
- To investigate the role of olfactory bulb (OB) neurogenesis and cell turnover in olfactory learning behaviors.
- To understand how altering cell death and addition impacts odor discrimination.
Main Methods:
- Utilized genetically modified mice (Bax-KO) with altered cell death and addition rates.
- Employed surgical lesions to disrupt the rostral migratory stream of neuroblasts.
- Compared olfactory learning abilities across different experimental groups and wild-type littermates.
Main Results:
- Aged mice lacking both cell death and addition (no cell replacement) showed faster odor discrimination than controls.
- Young mice lacking cell death but retaining addition, and mice with cell death but no addition, exhibited normal olfactory learning.
- Chronic perturbation of OB cell replacement led to an unexpected enhancement in olfactory learning.
Conclusions:
- Olfactory bulb (OB) cell replacement is necessary for typical olfactory learning.
- Disrupting OB neurogenesis and cell turnover can lead to altered neural circuits and enhanced olfactory learning capabilities.
